SPECTROPHOTOMETER

Abstract

The invention relates to the field of optical instrumentation and is intended for use in analyses in industrial laboratories and for scientific research purposes in analytical studies of the spectral characteristics of various materials. The technical result is an increase in the quality and accuracy of angular dependence measurements and measurements of complex prisms. A spectrophotometer comprises a housing, a measuring compartment and a source of monochromatic radiation, where the following are installed: a radiation source, a monochromator, an assembly of polarizers, a mirror element, a measuring channel with an assembly of photodetectors with a lens, a reference channel with an assembly of photodetectors with a lens; a rotary object table, capable of providing a triple exposure of the specimens when carrying out measurements, with a hollow rotation shaft and with specimens; and devices for moving the assembly of the measuring channel of the photodetectors with a vertical rotation shaft.

Claims

1-4. (canceled)

5. A spectrophotometer comprising: a housing comprising a measuring compartment, a source of monochromatic radiation, a monochromator, an assembly of polarizers, a mirror element splitting a light beam emerging from said monochromator into a measuring channel comprising a first assembly of one or more photodetectors, having a vertical rotation shaft, and a first lens, and a reference channel with a second assembly of one or more photodetectors and a second lens, a rotary object table, having a rotation shaft, for placement of a specimen, having an end face, for measurements, wherein said rotary object table is in said measuring compartment and is configured to provide a triple exposure to said light beam of said specimen during measurements, said rotary object table is configured to rotate around said rotation shaft clockwise or counterclockwise until said end face of said specimen crosses said light beam emerging from said monochromator, and wherein the first assembly of one or more photodetectors of said measuring channel is configured to rotate around said rotation shaft of said rotary object table clockwise or counterclockwise until the first assembly crosses said light beam emerging from said monochromator, and with simultaneous independent rotation of the first assembly of the one or more photodetectors of the measuring channel around said vertical rotation shaft clockwise or counterclockwise until the first assembly crosses said light beam entering the first lens of the first assembly of one or more photodetectors.

6. The spectrophotometer according to claim 1, wherein said first assembly crossing said light beam entering the first lens of the first assembly of one or more photodetectors ensures the reception of said light beam into the first lens of the first assembly of one or more photodetectors and passing said light beam through said specimen being measured or a light beam reflected from said specimen being measured exactly along the normal, with displacement of said light beam.

7. The spectrophotometer according to claim 1, wherein said first assembly crossing said light beam entering the first lens of the first assembly of one or more photodetectors ensures the reception of said light beam into the first lens of the first assembly of one or more photodetectors and passing said light beam through said specimen being measured or a light beam reflected from said specimen being measured exactly along the normal, without displacement of said light beam.

8. The spectrophotometer according to claim 1, wherein said first assembly of one or more photodetectors of the measuring channel comprises more than one photo detectors.

9. The spectrophotometer according to claim 1, wherein the second assembly of the one or more photodetectors of the reference channel comprises more than one photodetectors.

10. The spectrophotometer according to claim 1, wherein said rotation shaft of said rotary object table comprises a hollow cavity and is configured to lay a power cable through said cavity to provide remote control of the rotation of said rotary object table and movement of said specimen relative to said light beam emerging from said monochromator, without opening said measuring compartment.

11. A method for providing triple exposure to a light beam of a specimen under measurement comprising: Placing a specimen on a rotary object table, having a rotation shaft, wherein said rotary object table is being housed in a measuring compartment of a housing of a spectrophotometer comprising a source of monochromatic radiation, a monochromator, an assembly of one or more polarizers, a mirror element splitting a light beam emerging from said monochromator into a measuring channel comprising a first assembly of one or more photodetectors, having a vertical rotation shaft, and a first lens, and a reference channel with a second assembly of one or more photodetectors and a second lens, wherein said rotary object table is in said measuring compartment and is configured to provide a triple exposure to said light beam of said specimen during measurements, said rotary object table is configured to rotate around said rotation shaft clockwise or counterclockwise until said end face of said specimen crosses said light beam emerging from said monochromator, and wherein the first assembly of one or more photodetectors of said measuring channel is configured to rotate around said rotation shaft of said rotary object table clockwise or counterclockwise until the first assembly crosses said light beam emerging from said monochromator, and with simultaneous independent rotation of the first assembly of the one or more photodetectors of the measuring channel around said vertical rotation shaft clockwise or counterclockwise until the first assembly crosses said light beam entering the first lens of the first assembly of one or more photodetectors; Measuring said specimen placed on said rotary object table by providing a triple exposure to said light beam.

12. The method according to claim 11, wherein said first assembly crossing said light beam entering the first lens of the first assembly of one or more photodetectors ensures the reception of said light beam into the first lens of the first assembly of one or more photodetectors and passing said light beam through said specimen being measured or a light beam reflected from said specimen being measured exactly along the normal, with displacement of said light beam.

13. The method according to claim 11, wherein said first assembly crossing said light beam entering the first lens of the first assembly of one or more photodetectors ensures the reception of said light beam into the first lens of the first assembly of one or more photodetectors and passing said light beam through said specimen being measured or a light beam reflected from said specimen being measured exactly along the normal, without displacement of said light beam.

14. The method according to claim 11, wherein said first assembly of one or more photodetectors of the measuring channel comprises more than one photo detectors.

15. The method according to claim 11, wherein the second assembly of the one or more photodetectors of the reference channel comprises more than one photo detectors.

16. The method according to claim 11, wherein said rotation shaft of said rotary object table comprises a hollow cavity and is configured to lay a power cable through said cavity to provide remote control of the rotation of said rotary object table and movement of said specimen relative to said light beam emerging from said monochromator, without opening said measuring compartment.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The essence of the invention is illustrated by drawings in FIG. 1-3.

[0019] FIG. 1 shows the basic optical scheme of the spectrophotometer.

[0020] FIG. 2 shows an assembly of the photodetectors of the measuring channel.

[0021] FIG. 3 shows an assembly of the photodetectors of the reference channel.

DETAILED DESCRIPTION OF THE INVENTION

[0022] The spectrophotometer comprises a housing 1, a measuring compartment 2 and a monochromatic radiation source 3, where the following are installed: a radiation source 4, a monochromator 5, an assembly of polarizers 6, a mirror element 7, a measuring channel with an assembly 8 of photodetectors 12 with a lens 13, a reference channel with an assembly 9 of photodetectors 14 with a lens 15; a rotary object table 10 with a hollow rotation shaft 16 and with specimens 11; and devices for moving the assembly 8 of the measuring channel of the photodetectors 12 with a vertical rotation shaft 17.

[0023] The spectrophotometer works as follows. In accordance with the instructions, the device is turned on and made it ready. Before this, a specimen 11 is placed on the rotary object table 10 inside the measuring compartment 3 in the housing 1 for measurements to be carried out. The specimen 11 is fixed and the measuring compartment 2 is closed. During measurements, a triple exposure of the specimen 11 is provided. For this, the rotary object table 10 with the specimen 11 is rotated around the rotation shaft 16 clockwise or counterclockwise until the end face of the specimen 11 crosses the light beam exiting the source 4, passing through the polarizer 6, and emerging from the monochromator 5. In this case, part of the light flux is directed by the mirror element 7 into the lens 15 to the photodetectors 14 of the assembly 9 of the reference channel, and the other part of the light flux is directed to the specimen 11, and after transmission or reflection of the light beam, it enters the measuring channel through the lens 13 into the photodetectors 12 of the assembly 8. Simultaneously, the assembly 8 with the photodetectors 12 is rotated around the vertical rotation shaft 17 clockwise or counterclockwise until crossing the beam entering the lens 13 on the photodetectors 12, with independent rotation of the assembly 8 with the photodetectors 12 around the rotation shaft 16 of the rotary object table 10 to ensure that the light beam is received into the lens 13 of the photodetectors 12 and passed through the measured specimen 11 or light beam reflected from the measured specimen 11 exactly along the normal with displacement or without displacement of the light beam.

[0024] The rotary object table 10 is mounted on the rotation shaft 16, which is hollow (not shown in the drawing) and configured in such a way that a power cable can be laid through the cavity of the shaft 16 to provide (not shown in the drawing) remote control of the rotary object table 10 with the specimen 11 relative to the light beam emerging from the monochromator 5, without opening the measuring compartment 2. Also, the spectrophotometer is equipped with a set of rotary object tables 10, which are replaceable, with motorized drives (not shown in the drawing). The rotary object table 10 has a mating electrical connector (not shown in the drawing), which is installed in a mating part of the assembly for its installation (for example, in the form of a dovetail). When installing a motorized rotary object table 10 through an electrical connector, power is supplied to the electrical circuit of the control board with a controller and computer remote control of the rotary object table 10 without opening the measuring compartment 2.

[0025] Inside the housings (not shown in the drawing) of the assembly 8 with the photodetectors 12 of the measuring channel and the assembly 9 with the photodetectors 14 of the reference channel, sets of photodetectors 12 and 14 are installed, respectively (from 1 to 4 pieces in various combinations, for example, PMT, Si, InGaAs, PbS, MCT, etc., with and without cooling) and a mechanism (not shown in the drawing) for automatic positioning of photodetectors 12 and 14 on the beam axis, which photodetectors are used depending on the required spectral range of measurements.

[0026] The implementation of the triple exposure of specimens 11 during measurements due to a combination of rotations of the rotary object table 10 and corresponding rotations of the assembly 8 with the photodetectors 12 ensures the achievement of the claimed technical result and, as a result, increases the quality and accuracy of angular and polarization measurements of transmission and reflection, as well as measurements of complex prisms regardless of the thickness of the specimens and the geometric complexity of the prisms.

[0027] Information Sources:

[0028] 1 New universal spectrophotometer Cary 7000. OOO “ALSI-CHROM”, http://www.alsichrom.com, © 2014.

[0029] 2. Spectrophotometer Agilent Cary 60. Business Center “North House”. Millab company, www.millab.ru, 2018.

[0030] 3. UV-spectrophotometer SF-56. OOO “OKB SPEKTR”, http://okb-spectr.ru/products/sf/sf56/, 2018.

[0031] 4. JP No. 2010160025 (A), 22.07.2010.

[0032] 5. CN No. 107796514 (a), 24.11.2017 (prototype).