Abstract
Provided is an optical axis adjustment device for an X-ray analyzer comprising an incident-side arm, a receiving-side arm, an X-ray source, an incident-side slit, and an X-ray detector, wherein the device comprises a shielding strip disposed at a position blocking X-rays received by the X-ray detector from the X-ray source, and a shielding strip-moving device that rotates the shielding strip around the sample axis relative to the optical axis of X-rays reaching the X-ray detector from the X-ray source to two angle positions, and the amount of deviation in parallelism of the surface of a sample with respect to the optical axis of the X-rays is found on the basis of X-ray intensity values found by the X-ray detector for the two angle positions.
Claims
1. An optical axis adjustment device for an X-ray analyzer comprising: an incident-side arm that rotates around a sample axis passing through a sample position constituting a position at which a sample is placed; a receiving-side arm that rotates around the sample axis and extends toward a side opposite the incident-side arm; an X-ray source provided on the incident-side arm; an incident-side slit provided on the incident-side arm between the sample position and the X-ray source; an X-ray detector provided on the receiving-side arm; a shielding strip disposed at a position blocking X-rays received by the X-ray detector from the X-ray source, the shielding strip extending only in a receiving direction from the sample axis, and shielding strip-moving means for rotating the shielding strip around the sample axis relative to an optical axis of the X-rays reaching the X-ray detector from the X-ray source to two different angle positions; wherein an amount of deviation in parallelism of the surface of the sample with respect to the optical axis of the X-rays is found on the basis of X-ray intensity values found by the X-ray detector for each of the two angle positions.
2. The X-ray analyzer optical axis adjustment device according to claim 1, wherein an X-ray-incident side of the shielding strip is aligned with the sample axis.
3. The X-ray analyzer optical axis adjustment device according to claim 2, wherein the two angles for the shielding strip are set to a positive-side angle and a negative-side angle so as to cancel out information for the thickness of the shielding strip and obtain only angle information for the shielding strip.
4. The X-ray analyzer optical axis adjustment device according to claim 3, wherein the length of the shielding strip in a direction along the sample axis is greater than the width of the incident X-ray beam in a direction along the sample axis.
5. The X-ray analyzer optical axis adjustment device according to claim 4, wherein the X-ray detector is a one-dimensional X-ray detector possessing X-ray intensity positional resolution, that is the ability to detect X-ray intensity in predetermined regions on a straight line, and the straight line along which the positional resolution is applied extends in a direction along the X-ray angle of diffraction.
6. The X-ray analyzer optical axis adjustment device according to claim 1, wherein the length of the shielding strip in a direction along the sample axis is greater than the width of the incident X-ray beam in a direction along the sample axis.
7. The X-ray analyzer optical axis adjustment device according to claim 1, wherein the X-ray detector is a one-dimensional X-ray detector possessing X-ray intensity positional resolution, that is the ability to detect X-ray intensity in predetermined regions on a straight line, and the straight line along which the positional resolution is applied extends in a direction along the X-ray angle of diffraction.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
(1) FIG. 1 is a view showing an embodiment of an X-ray analyzer according to the present invention;
(2) FIG. 2 is a flow chart showing a process executed by the X-ray analyzer shown in FIG. 1;
(3) FIG. 3 is a view showing an example of measurement performed by the X-ray analyzer shown in FIG. 1;
(4) FIG. 4 is a view showing one step in 2-adjustment, a type of optical axis adjustment;
(5) FIG. 5 is a graph showing results from 2 adjustment;
(6) FIG. 6 is a view showing one step in Zs-axis adjustment, another type of optical axis adjustment;
(7) FIG. 7 is a graph showing results from Zs-axis adjustment;
(8) FIG. 8 is a view showing another step in Zs-axis adjustment;
(9) FIG. 9 is a graph showing other results from Zs-axis adjustment;
(10) FIG. 10A is a plan view of an example of an optical axis adjustment jig used when performing -adjustment, which is yet another type of optical axis adjustment, FIG. 10B is a front view of the optical axis adjustment jig, and FIG. 10c is a side view along line E-E in FIG. 10B;
(11) FIG. 11 is a perspective view of an example of the optical axis adjustment jig shown in FIGS. 10A to 10C being attached to an X-ray analyzer;
(12) FIGS. 12A, 12B, and 12C are schematic views of three steps performed in succession during -adjustment;
(13) FIGS. 13A and 13B are schematic views of a main process performed during the -adjustment according to the present invention;
(14) FIG. 14 is a graph for illustrating a main process of the -adjustment according to the present invention;
(15) FIG. 15A shows an example of conventional optical axis adjustment, and FIG. 15B shows an example of conventional X-ray measurement;
(16) FIG. 16A is a graph showing a diffraction profile obtained using conventional optical axis adjustment, and FIG. 16B is a perspective view of an example of an optical axis adjustment jig used in conventional optical axis adjustment; and
(17) FIG. 17A is a schematic view of an example of the pixel layout of a two-dimensional X-ray detector, and FIG. 17B is a schematic view of an example of the pixel layout of a one-dimensional X-ray detector.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
(18) An embodiment of the X-ray analyzer according to the present invention will now be described. As shall be apparent, the present invention is not limited to this embodiment. Constituent elements may be shown at other than their actual proportions in the drawings attached to the present specification so as to facilitate comprehension of characteristic portions.
(19) FIG. 1 shows an embodiment of an X-ray analyzer according to the present invention. An X-ray analyzer 1 shown herein comprises a sample stage 2 for supporting a sample S, an incident-side arm 3 capable of rotating around a sample axis X0 constituted by an imaginary line extending through the surface of the sample S in a drawing surface-penetrating direction, and a receiving-side arm 4 capable of rotating around the sample axis X0. The incident-side arm 3 and the receiving-side arm 4 extend in opposite directions. The rotation of the incident-side arm 3 around the sample axis X0 will be referred to as s-rotation, and the rotation of the receiving-side arm 4 around the sample axis X0 as d-rotation.
(20) A sample S is in place on the sample stage 2 in FIG. 1, but, when performing an optical axis adjustment operation as described hereafter, the sample S is removed from the sample stage 2 and X-rays allowed to freely pass through the position at which the sample S is placed (hereafter also referred to as the sample position), or a center slit or optical axis adjustment jig is placed on the sample stage 2.
(21) The incident-side arm 3 supports an X-ray tube 7 and an incident-side slit 8. An X-ray source F is provided within the X-ray tube 7. A filament (not shown) is provided within the X-ray tube 7 as a cathode, and a target (not shown) as an anticathode. The region in which thermoelectrons released from the filament are capable of colliding with the surface of the target is the X-ray focus, from which X-rays are emitted. The X-ray focus constitutes the X-ray source F. In the present embodiment, the X-ray source F is an X-ray focus for a line focus extending in the drawing surface-penetrating direction. A slit groove of the incident-side slit 8 extends in the drawing surface-penetrating direction.
(22) The receiving-side arm 4 comprises a one-dimensional X-ray detector 11, which is the X-ray detector having X-ray intensity positional resolution within a linear area. The one-dimensional X-ray detector 11 is constituted, for example, by a position-sensitive proportional counter (PSPC), a one-dimensional charge-coupled device (CCD) array, or a one-dimensional photon-counting pixel array. As schematically shown, for example, in FIG. 17B, the one-dimensional X-ray detector 11 is formed by arranging a plurality of pixels (i.e., detection regions) 61 capable of detecting X-rays in a line in a direction orthogonal to the direction in which the receiving-side arm 4 extends. The plurality of pixels 61 are arranged within a region where the one-dimensional X-ray detector 11 can receive X-rays, the region being referred to as an X-ray receiving region. That is, the one-dimensional X-ray detector 11 is capable of detecting X-ray intensity at the pixel level within a linear region orthogonal to the direction in which the receiving-side arm 4 extends. In other words, the one-dimensional X-ray detector 11 possesses positional resolution for X-ray intensity within a linear region orthogonal to the direction in which the receiving-side arm 4 extends.
(23) The incident-side arm 3 is driven by a s-rotation drive device 12 so as to engage in s-rotation around the sample axis X0. The s-rotation drive device 12 rotates the incident-side arm 3 at a predetermined timing and predetermined angular conditions according to commands from a control device 13. The control device 13 is constituted by a computer comprising a central processing unit (CPU) and memory (a storage medium). Software for executing the 2-adjustment, Zs-axis adjustment, and -adjustment described hereafter is stored in the memory.
(24) The receiving-side arm 4 is driven by a d-rotation drive device 14 to engage in d-rotation around the sample axis X0. The d-rotation drive device 14 rotates the receiving-side arm 4 at a predetermined timing and predetermined angular conditions according to commands from the control device 13. The s-rotation drive device 12 and d-rotation drive device 14 are formed by a suitable power transmission mechanism, such as a power transmission mechanism using a worm and a worm wheel.
(25) The slit width of the incident-side slit 8 can be adjusted using a slit opening/closing drive device 17. The slit opening/closing drive device 17 operates according to commands from the control device 13. The incident-side slit 8 is capable of moving in a direction orthogonal to the centerline R0 of the incident X-rays (i.e., vertical direction A-A in FIG. 1) while maintaining a constant slit width. A Zs-movement device 19 linearly moves the incident-side slit 8 a desired distance from direction A toward direction A according to commands from the control device 13. The X-ray source F is turned on and off by the control device 13. Output signals from each of the pixels of the one-dimensional X-ray detector 11 are converted by an X-ray intensity-calculating circuit 18 to intensity signals of a predetermined data format and transmitted to the control device 13. In some cases, the X-ray intensity-calculating circuit 18 may be provided within the one-dimensional X-ray detector 11.
(26) Upon starting up, the control device 13 sets the various devices shown in FIG. 1 to predetermined initial settings in step S1, as shown in FIG. 2. Next, if instructions to set the optical axis have been inputted using an input device such as a keyboard or a mouse, an assessment of YES is made in step S2, and an optical axis adjustment process is executed in step S3.
(27) If instructions to set the optical axis have not been made in step S2, the process continues to step S4, it is checked whether instructions to perform measurement have been given, and, if so, the process continues to step S5 and X-ray measurement is executed. After X-ray determination is complete, it is checked in step S6 whether instructions to analyze the measured data have been given, and, if so, an analytical process is executed in step S7. Subsequently, it is checked in step S8 whether instructions to finish using the device have been given, and, if so, control is ended.
(28) (1) X-Ray Measurement
(29) Next, an example of the X-ray measurement performed in step S5 of FIG. 2 will be described. In the present embodiment, it will be assumed that X-ray diffractional measurement is being performed upon a powder sample. Various types of X-ray measurement are presently known. As such, the type of X-ray measurement actually executed is selected according to the target X-ray measurement as necessary.
(30) If the X-ray measurement consists of X-ray diffractional measurement being performed upon a powder sample, a powder sample S is placed upon the sample stage 2 in FIG. 1. Specifically, the powder sample S is packed into a predetermined sample holder, which is placed upon the sample stage 2. In this way, the sample S is thus placed at a predetermined sample position within the X-ray analyzer 1, and measurement begins when an operator gives instructions to begin measurement.
(31) Specifically, in FIG. 3, the X-ray source F is rotated by the s-rotation of the incident-side arm 3. Simultaneously, the one-dimensional X-ray detector 11 is 2 rotated by the d-rotation of the receiving-side arm 4. While the X-ray source F is undergoing -rotation and the X-ray detector 11 is undergoing 2-rotation, X-rays emitted by the X-ray source F become incident upon the sample S. When diffraction conditions between the X-rays incident upon the sample S and the crystal lattice plane within the sample S are met, the X-rays are diffracted by the sample S, and the diffracted X-rays are detected by the one-dimensional X-ray detector 11. The X-ray intensity of the diffracted X-rays at the various angle positions for the angle of diffraction 2 is determined on the basis of the output signals from the X-ray detector 11, and this X-ray intensity becomes X-ray diffractional measurement results data.
(32) The X-ray diffractional measurement described here is one example of X-ray measurement, and another suitable type of measurement other than X-ray diffractional measurement can actually be performed as necessary.
(33) (2) Optical Axis Adjustment
(34) Next, the optical axis adjustment performed in step S3 of FIG. 2 will be described. This optical axis adjustment consists of three types: 2-adjustment, Zs-axis adjustment, and -adjustment. These various types of adjustment will be individually described hereafter.
(35) (2-1) 2-Adjustment
(36) 2-adjustment is adjustment for aligning the 2=0 angle position in the optical system of the X-ray analyzer 1 (FIG. 1) and the centerline of the X-rays reaching the X-ray detector 11 from the X-ray source F.
(37) 2-adjustment involves determining a d-correction value for correcting the angle of the X-ray detector 11 with the incident-side slit 8 set to an open state at a predetermined aperture. Specifically, in FIG. 3, the process involves setting the incident-side arm 3 is set to =0, also setting the receiving-side arm 4 to =0, and setting the optical system to the 2=0 state shown in FIG. 1, then adjusting so that the centerline R0 of the X-rays reaching the X-ray detector 11 from the X-ray source F aligns with the 2=0 angle position of the one-dimensional X-ray detector 11.
(38) In 2-adjustment, as shown in FIG. 1, the incident-side arm 3 is first set to s=0, the receiving-side arm 4 is set to d=0, and the optical system is set to 2=0. Next, the incident-side slit 8 is set to an open state by the opening/closing drive device 17. The sample S is then removed from the sample stage 2, and a center slit 20 is placed on the sample stage 2 in lieu of the sample S, as shown in FIG. 4.
(39) With the one-dimensional X-ray detector 11 fixed in the state shown in FIG. 4, X-rays are emitted from the X-ray source F, and X-rays passing through the open incident-side slit 8 and the center slit 20 are detected by the X-ray detector 11. The one-dimensional X-ray detector 11 possesses positional resolution for the x-ray intensity in a direction orthogonal to the direction of the X-rays, thereby the detector 11 can obtain an X-ray profile P1 within a predetermined angular region in the 2-direction, as shown in FIG. 5, via one round of X-ray irradiation from the X-ray source F.
(40) Assuming that the peak position of the profile P1 deviates 0 from 2=0, the amount of deviation 0 indicates the sum of the amount of deviation of the d-axis and the amount of deviation of the X-ray detector 11. This being the case, optical axis adjustment for the 2-direction can be performed by setting the amount of deviation 50 as the correction value for the d-axis for the X-ray measurement results data shown in FIG. 5. Specifically, the position of the X-ray detector 11 is adjusted by moving the receiving-side arm 4 a distance of the amount of deviation 0 in FIG. 3. If the X-ray optical elements, such as slit, monochromator, etc., are mounted on the receiving-side arm 4, the positions of such the X-ray optical elements are also adjusted.
(41) In the example shown in FIG. 5, 0 was 0.2831. It is therefore possible to correct deviation in the 2 direction, i.e., correct deviation with respect to the d-axis, by subtracting 0=0.2831 from the value for 2 in the data obtained by the X-ray detector 11. Peak waveform P2 shown in FIG. 5 is a corrected peak waveform obtained by correcting the raw measurement data shown by peak waveform P1 by 0=0.2831 in the negative direction, and the peak of the peak waveform P2 is aligned with 2=0.
(42) (2-2) Zs-Axis Adjustment
(43) Next, Zs-axis adjustment will be described. Zs-axis adjustment involves setting the incident-side slit 8 shown in FIG. 1 to a suitable position with respect to the optical axis R0 of the X-rays reaching the X-ray detector 11 from the X-ray source F. In Zs-axis adjustment, the sample 2 is removed from the sample stage 2 with the X-ray analyzer 1 being in the state shown in FIG. 1 (i.e., 2=0) so that X-rays can freely pass through the sample position.
(44) Next, the Zs-axis (i.e., the incident-side slit 8) is moved by the Zs-movement device 19 shown in FIG. 1 to a first position Q1 (such as 0.5 mm) along the A-A direction shown in FIG. 1, as shown in FIG. 6. X-rays are then emitted by the X-ray source F in this state, and X-rays passing through the incident-side slit 8 are detected by the one-dimensional X-ray detector 11. Because the one-dimensional X-ray detector 11 comprises X-ray-detecting pixels arrayed in the 2-direction, the profile P3 shown in FIG. 7 can be obtained through a single round of X-rays irradiation. The peak pp3 of the profile P3 was, for example, 2=0.06.
(45) Next, the Zs-axis (i.e., the incident-side slit 8) is moved by the Zs-movement device 19 shown in FIG. 1 to a second position Q2 (such as 0.2 mm) along the A-A direction shown in the FIG. 1, as shown in FIG. 8. X-rays are then emitted by the X-ray source F in this state, and X-rays passing through the incident-side slit 8 are detected by the one-dimensional X-ray detector 11. The profile P4 shown in FIG. 7 can be obtained via this single round of X-ray irradiation. The peak pp4 of the profile P4 was, for example, 2=0.11.
(46) The positional information for Q1 on the Zs-axis shown in FIG. 6 (i.e., 0.5 mm) is projected as pp3 (0.06) on the 2-axis (i.e., the lateral axis) of the graph shown in FIG. 7. Meanwhile, the position information for Q2 on the Zs-axis shown in FIG. 8 (i.e., 0.2 mm) is projected as pp4 (0.11) on the 2-axis (i.e., the lateral axis) of the graph shown in FIG. 8. In other words, the distance moved by the incident-side slit 8 on the Zs-axis (Q1Q2=0.50.2=0.3 mm) is projected as the distance pp3-pp4 (=0.06+0.11=0.17) on 2-axis. It is apparent from this that the angle of 0.06 on 2-axis is equivalent to the 0.1 mm distance moved by the incident-side slit 8 on the Zs-axis.
(47) Accordingly, it is possible to measure at least two measurement positions Q1, Q2 on the Zs-axis to draw profiles of measurement results on a diffraction-profile graph such as those shown in FIG. 7, find the relationships of the peak positions of the profiles to 2=0, and reflect these relationships in the positions on the Zs-axis in order to accurately find the position on the Zs-axis corresponding to 2=0. In other words, the position on the Zs-axis corresponding to 2=0 can be calculated on the basis of the peak position (pp3) in FIG. 7 corresponding to Q1 (FIG. 6) on the Zs-axis and the peak position (pp4) in FIG. 7 corresponding to Q2 (FIG. 8) on the Zs-axis.
(48) For example, assuming that Q1=0.5 mm, Q2=0.2 mm, pp3=0.06, and pp4=0.11, the position Zs on the Zs-axis corresponding to the X-ray angle 2=0 can be found using the formula
Zs=0.5 mm+(b/a)0.3 mm(1)
Wherein
a=+0.11(0.06)
b=0(0.06).
Using formula (1) above, Zs0.4 mm.
(49) For confirmation, the incident-side slit 8 was replaced at the position Zs=0.4 mm in FIG. 6, and X-rays were detected using the X-ray detector 11. When the measurement results were then plotted on the diffraction line graph shown in FIG. 7, profile P5 was obtained. The peak position of the profile P5 was aligned with 2=0. This showed that the above-mentioned correction formula (1) for the incident-side slit 8 was appropriate.
(50) For further confirmation, the position of the incident-side slit 8 on the Zs-axis was adjusted according to the calculated results, after which X-ray diffractional measurement was performed according to the following three sets of conditions.
(51) (A) An incident-side slit 8 having an divergence angle of () was disposed at the position of the incident-side slit 8 in FIG. 6, and X-ray measurement was performed using the one-dimensional X-ray detector 11.
(52) (B) An incident-side slit having a slit width of 0.2 mm was disposed at the position of the incident-side slit 8 in FIG. 6, and X-ray measurement was performed using the one-dimensional X-ray detector 11.
(53) (C) An incident-side slit 8 having a slit width of 0.2 mm was disposed at the position of the incident-side slit 8 in FIG. 6, a center slit was further disposed at the sample position, and X-ray measurement was performed using the one-dimensional X-ray detector 11.
(54) When the measurement results for the various conditions described above were plotted on the X-ray diffraction diagram shown in FIG. 9, profile T1 was obtained as the measurement results for conditions (A), profile T2 was obtained as the measurement results for conditions (B), an profile T3 was obtained as the measurement results for conditions (C). In all of the results, the peak value appeared at 2=0. It was thus apparent that the position of the incident-side slit 8 on the Zs-axis was correctly aligned to 2=0. It was also apparent that the position was aligned to 2=0 regardless of the presence or lack of a center slit.
(55) (2-3) -Adjustment
(56) Next, the -adjustment variety of optical axis adjustment will be described. The -adjustment involves aligning the surface of the sample S in FIG. 1 so as to be parallel to the X-rays R1 incident upon the sample S.
(57) In a conventional X-ray analyzer, as described using FIGS. 15A and 16B, -adjustment is performed by placing the optical axis adjustment jig 58 at the sample position, simultaneously continuously rotating the X-ray source F and the zero-dimensional X-ray detector 53 within a prescribed angle range around the sample position so that the centerline of the X-rays reaching the zero-dimensional X-ray detector 53 from the X-ray source F remained a straight line while measuring the magnitude of the X-ray intensity using the zero-dimensional X-ray detector 53, evaluating the degree of parallelism of the optical axis adjustment jig 58 to the X-ray optical axis on the basis of the X-ray intensity magnitude, and performing e-adjustment on the basis of the evaluation results.
(58) In the present embodiment, by contrast, an optical axis adjustment jig 21 shown in 10A, 10B, and 10C is set in place at a predetermined position on the sample stage 2 instead of the sample S, as shown in FIG. 11, the X-ray source F and the one-dimensional X-ray detector 11 are rotated between two difference positions around the sample position (such as s=+0.5, d=0.5, 1 (1) shown in FIG. 12A and s=0.5, d=+0.5, +1 (2) shown in FIG. 12B) so that the centerline (i.e., the optical axis) R0 of the X-rays reaching the one-dimensional X-ray detector 11 from the X-ray source F in FIG. 1 remains a straight line (i.e., fixed at 2=0), and the X-ray intensity is measured using the one-dimensional X-ray detector 11 at each position.
(59) The angle described by the X-ray optical axis R0 when the surface of the sample is parallel to the X-ray optical axis R0 is calculated from the relationship between the angle of the X-ray optical axis R0 and the width of the angle of diffraction projected on 2. The calculated angle is the e-axis correction value, and the position of the e-axis correction value is aligned with =0 of the measurement system.
(60) As shown in FIG. 11, the optical axis adjustment jig 21 comprises a shielding strip 22 for blocking X-rays. An X-ray-incident side 22a of the shielding strip 22 is aligned with the sample axis X0. A roughly central portion of the shielding strip 22 in a direction along the sample axis X0 is aligned with the X-ray optical axis R0. The length L2 of the shielding strip 22 along the sample axis X0 is preferably greater than the width of the incident X-ray beam in a direction along the sample axis X0.
(61) More specifically, the -axis is aligned to 1 (for example, 1.0, as shown in FIG. 12A, and an X-ray intensity I1 is measured using the one-dimensional X-ray detector 11. Next, the -axis is moved to 2 (for example, +1.0), as shown in FIG. 12B, and an X-ray intensity I2 is measured using the one-dimensional X-ray detector 11. Next, the measurement data obtained when the -axis is at 1 and at 2 are aligned.
(62) FIG. 13A shows a schematic magnification of measurement data having been aligned as described above. In FIG. 13A, t1 represents the thickness d of the shielding strip 22, and t2 represents the position of the tail of the shielding strip 22. When the value of (t2t1) in FIG. 13A is found, this value represents the opening level (21), as shown in FIG. 13B. Accordingly, -adjustment can be performed by finding a correction value for the -axis so that the value for (t2t1) is equally spaced around 0.0.
(63) In FIG. 14, P21 is an X-ray profile measured when 1=1.0 in FIG. 12A. P22 is an X-ray profile measured when 2=+1.0 in FIG. 12B. Here, the difference 21 between the low angle sides of P21 and P22 is roughly 0.10. The difference 22 between the high angle sides of P21 and P22 is roughly 0.17.
(64) The amount of deviation from the center on 2 is
(0.10+0.17)2.00.10=0.035(2)
and the -axis correction angle is
0.0352.0(0.10+0.17)0.259(3).
(65) Information obtained by shifting the -axis 1.0 is projected on 2 as (0.10+0.17=0.27). When the -axis has been adjusted, 21 and 22 have identical values. Because 2 on the -axis corresponds to 0.27 on 2, formulas (2) and (3) shown above hold true.
(66) Once the three types of adjustment described above 2-adjustment, Zs-axis adjustment, and -adjustment have been performed, the optical axis adjustment of step S3 in FIG. 2 is complete.
(67) In accordance with the present embodiment, as described above, out of the different types of optical axis adjustment, -adjustment (i.e., finding and correcting the amount of deviation in parallelism of the surface of the sample with respect to the optical axis of the X-rays) is performed on the basis only of diffracted X-ray intensities I1 and I2 corresponding to the angle positions of the shielding strip 22, which takes two angle positions 1 (FIG. 12A) and 2 (FIG. 12B), allowing -adjustment to be performed extremely quickly. As a result, the overall process of optical axis adjustment, including -adjustment, can be performed in an extremely short length of time.
(68) In accordance with the present embodiment, the amount of deviation between the angle of incidence of the X-rays with respect to the sample and the s angle of the incident-side arm 3 and the amount of deviation between the X-ray angle of diffraction 2 and the d angle of the receiving-side arm 4 are found by using the capability for X-ray intensity positional resolution possessed by the one-dimensional X-ray detector 11, thereby allowing the process of finding these amounts of deviation and the process of performing optical axis adjustment on the basis of the amounts of deviation to be performed quickly and simply.
Other Embodiments
(69) The foregoing has been a description of a preferred embodiment of the present invention, but the present invention is not limited to this embodiment, and various modifications can be made thereto within the scope of the invention as set forth in the claims.
(70) For example, the X-ray detector 11 of FIG. 1 is not limited to being a one-dimensional X-ray detector, but may also be a zero-dimensional X-ray detector. Although a dedicated one-dimensional X-ray detector such as that shown in FIG. 17B is used as the one-dimensional X-ray detector in the embodiment described above, it is also possible to use the necessary pixels 62 of a two-dimensional X-ray detector such as that shown in FIG. 17A as a one-dimensional X-ray detector instead.
EXPLANATION OF SYMBOLS
(71) 1. X-ray analyzer, 2. sample stage, 3. incident-side arm, 4. receiving-side arm, 7. X-ray tube, 8. incident-side slit, 11. one-dimensional X-ray detector, 12. s-rotation drive device, 13. control device, 14. d-rotation drive device, 17. slit opening/closing drive device, 18. X-ray intensity-calculating circuit, 19. Zs-movement device, 20. center slit, 21. optical axis adjustment jig, 22. shielding strip, 22a. X-ray-incident side of the shielding strip, 51. fixed-sample X-ray analyzer, 52. sample stage, 53. zero-dimensional X-ray detector, 54. incident-side slit, 55. incident-side arm, 56. receiving-side slit, 57. receiving-side arm, 58. optical axis adjustment jig, 59a,59b. reference surfaces, 61,62. pixels, D0. full width at half maximum intensity (FWHM), F. X-ray focus (X-ray source), I0. line of a constant intensity, P1. X-ray profile, P2. corrected X-ray profile, P3. Profile of 0.5 mm, P4. Profile of 0.2 mm, P5. corrected X-ray profile, PP3,PP4. peak, Q1. first position for Zs-axis, Q2. second position for Zs-axis, R0. centerline of X-rays (X-ray optical axis), R1. centerline of diffracted X-rays, S. sample, X0. sample axis,
