Integrating sphere photometer spectral response measurement method and system

Abstract

An integrating sphere photometer spectral response measurement system has an integrating sphere photometer and three or more reference light sources having different peak wavelengths. The integrating sphere photometer has an integrating sphere and a broadband photodetector, wherein the broadband photodetector is mounted on a sphere wall of the integrating sphere. Emergent light of the reference light sources is incident to the integrating sphere. The total spectral radiation flux Pi()(i=1, 2, . . . n) received by an integrating sphere photometer system is acquired; the response Mi(i=1, 2, . . . n) of a photometer of mixed light in the integrating sphere is read by the broadband photodetector; an equation set is established; and the spectral responsivity Srel() of the integrating sphere photometer is obtained by means of numerical solution.

Claims

1. An integrating sphere photometer spectral response measurement method, involving an integrating sphere photometer consisting of an integrating sphere and a broadband photodetector, the broadband photodetector being mounted on a sphere wall of the integrating sphere, wherein the integrating sphere photometer is used for measuring three or more reference light sources with different peak wavelengths, wherein at least one of the three or more reference light sources is an LED light source, and the LED light source consists of monochromatic LEDs and/or white LEDs with overlapping spectra, and a spectral responsivity of the integrating sphere photometer is calculated according to a spectral radiation flux of the reference light sources and the response of the integrating sphere photometer to the reference light sources; the method comprising: Step a, emitting light of the three or more reference light sources with different peak wavelengths to be incident to the integrating sphere, and reading the response M.sub.i(i=1, 2, . . . n) of the integrating sphere photometer, where n is the number of the reference light sources; Step b, acquiring the spectral radiation flux P.sub.i()(i=1, 2, . . . n) of the reference light sources incident to the integrating sphere; Step c, establishing the following equation, where S.sub.rel() is the spectral responsivity of the integrating sphere photometer, $\{\begin{array}{c}{}_{{}_1}^{{}_2}{P}_1\left(\right).Math.S_{\mathrm{rel}}\left(\right)=M_1\\ .Math.\\ {}_{{}_{2n-1}}^{{}_{2n}}{P}_n\left(\right).Math.S_{\mathrm{rel}}\left(\right)=M_n\end{array};$ Step d, obtaining the spectral responsivity S.sub.rel() of the integrating sphere photometer by means of numerical solution.

2. The integrating sphere photometer spectral response measurement method according to claim 1, wherein the spectral radiation flux P.sub.i() is an absolute value, or the spectral radiation flux P.sub.i() is a relative value.

3. The integrating sphere photometer spectral response measurement method according to claim 1, wherein the incident light of the reference light sources enters the integrating sphere through an incident window on the sphere wall of the integrating sphere, and an incident diaphragm is provided with a calibration detector capable of being connected to and disconnected from an optical path, so as to obtain the radiation flux of the reference light sources.

4. The integrating sphere photometer spectral response measurement method according to claim 1, wherein a measurement window connected with a calibrated spectral radiometer is arranged on the sphere wall of the integrating sphere to obtain the spectral radiation flux of the reference light sources.

5. The integrating sphere photometer spectral response measurement method according to claim 1, wherein at least one of the reference light sources is an adjustable light source with a uniform light-emitting surface, and the light-emitting surface of the at least one of the reference light sources is provided with a detachable spectral radiometer.

6. An integrating sphere photometer spectral response measurement system, comprising: an integrating sphere photometer and three or more reference light sources with different peak wavelengths, wherein at least one of the three or more reference light sources is an LED light source, and the LED light source consists of monochromatic LEDs and/or white LEDs with overlapping spectra, wherein the integrating sphere photometer consists of an integrating sphere and a broadband photodetector, the broadband photodetector is mounted on a sphere wall of the integrating sphere, an incident window is arranged on the integrating sphere, and the emergent light of the reference light sources is incident to the integrating sphere through the incident window.

7. The integrating sphere photometer spectral response measurement system according to claim 6, further comprising an incident diaphragm and a calibration detector, wherein the incident diaphragm is arranged outside the incident window of the integrating sphere, and the calibration detector is arranged on a diaphragm port of the incident diaphragm and capable of being connected to and disconnected from an optical path.

8. The integrating sphere photometer spectral response measurement system according to claim 6, comprising a spectral measurement window and a spectral radiometer, wherein the spectral measurement window is arranged on the sphere wall of the integrating sphere, and the spectral radiometer is connected with the spectral measurement window.

9. The integrating sphere photometer spectral response measurement system according to claim 6, wherein a light diffusion device is arranged in the integrating sphere, and a baffle is arranged in the integrating sphere.

10. The integrating sphere photometer spectral response measurement system according to claim 6, wherein an attenuation device is arranged outside the incident window.

11. The integrating sphere photometer spectral response measurement system according to claim 6, comprising an optical beam splitter and a monitoring device, wherein the optical beam splitter is arranged on an optical path of the emergent light of the reference light sources, and the monitoring device is used for measuring monitoring beams split by the optical beam splitter.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a flowchart of an integrating sphere photometer spectral response measurement method according to an embodiment of the invention;

(2) FIG. 2 is a structural diagram of an integrating sphere photometer spectral response measurement system using LED light sources according to an embodiment of the invention;

(3) FIG. 3 is a structural diagram of an integrating sphere photometer spectral response measurement system using LED area light sources according to an embodiment of the invention;

(4) FIG. 4 is a structural diagram of an integrating sphere photometer spectral response measurement system using a laser device according to an embodiment of the invention; and

(5) FIG. 5 is a structural diagram of an integrating sphere photometer spectral response measurement system using a laser device, an attenuation device and a light diffusion device according to an embodiment of the invention.

(6) 1integrating sphere; 2broadband photodetector; 3incident window; 4-1LED light source; 4-2laser device; 5attenuation device; 6light diffusion device; 7spectral measurement window; 8spectral radiometer; 9calibration detector; 10incident diaphragm; 11baffle; 12optical beam splitter; 13monitoring device.

DETAILED DESCRIPTION OF THE INVENTION

Embodiment 1

(7) An embodiment of an integrating sphere photometer spectral response measurement system provided by the invention, as shown in FIGS. 1 and 2, comprises an LED light source 4-1 and an integrating sphere 1, a broadband photodetector 2 is arranged on the sphere wall of the integrating sphere 1, an incident window 3 is also arranged on the integrating sphere 1, and the LED light source 4-1 can emit light of three or more specified bands in sequence.

(8) An integrating sphere photometer spectral response measurement method comprises the following steps: (1) an LED light source 4-1 emits light with three or more specified bands and overlapping spectra; (2) the spectral radiation flux P.sub.i()(i=1, 2, . . . n) of the light emitted from the LED light source 4-1 is obtained in advance; (3) the light emitted by the LED light source 4-1 sequentially is incident to the integrating sphere 1 through the incident window 3; (4) the photometric value M.sub.i(i=1, 2, . . . n) of mixed light in the integrating sphere is obtained through the broadband photodetector 2; and (5) according to the photometric value M.sub.i and spectral radiation flux P.sub.i() of the light emitted by the LED light source 4-1, the spectral responsivity S.sub.rel()(i=1, 2, . . . n) of the integrating sphere photometer is obtained by means of numerical solution:

(9) $\{\begin{array}{c}{}_{{}_1}^{{}_2}{P}_1\left(\right).Math.S_{\mathrm{rel}}\left(\right)=M_1\\ .Math.\\ {}_{{}_{2n-1}}^{{}_{2n}}{P}_n\left(\right).Math.S_{\mathrm{rel}}\left(\right)=M_n\end{array}$

Embodiment 2

(10) An embodiment of an integrating sphere photometer spectral response measurement system provided by the invention is shown in FIGS. 1 and 3. Compared with Embodiment 1, a spectral measurement window 7 and a spectral radiometer 8 are added, the spectral measurement window 7 is arranged on the sphere wall of the integrating sphere 1, and a receiving end of the spectral radiometer 8 is arranged on the spectral measurement window 7.

(11) An integrating sphere photometer spectral response measurement method comprises the following steps: (1) an LED light source 4-1 emits light with three or more specified bands and overlapping spectra; (2) the light emitted by the light source module 4-1 sequentially is incident to the integrating sphere 1; (3) the photometric value M.sub.i(i=1, 2, . . . n) of mixed light in the integrating sphere 1 is obtained through the broadband photodetector 2; (4) the spectral radiation flux P.sub.i()(i=1, 2, . . . n) of the light emitted from the LED light source 4-1 is obtained through the spectral radiometer 8; and (5) according to the photometric value M.sub.i and spectral radiation flux P.sub.i() of the light emitted by the LED light source 4-1, the spectral responsivity S.sub.rel()(i=1, 2, . . . n) of the integrating sphere photometer is obtained by means of numerical solution:

(12) $\{\begin{array}{c}{}_{{}_1}^{{}_2}{P}_1\left(\right).Math.S_{\mathrm{rel}}\left(\right)=M_1\\ .Math.\\ {}_{{}_{2n-1}}^{{}_{2n}}{P}_n\left(\right).Math.S_{\mathrm{rel}}\left(\right)=M_n\end{array}.$

Embodiment 3

(13) An embodiment of an integrating sphere photometer spectral response measurement system provided by the invention is shown in FIGS. 1 and 4. Compared with Embodiment 2, an incident diaphragm 10 and a calibration detector 9 are added. The incident diaphragm 10 is arranged outside the incident window 3 of the integrating sphere 1, and the calibration detector 9 can be connected to and disconnected from an optical path, and is arranged on a diaphragm port of the incident diaphragm 10 to obtain the radiation illuminance value of the light incident to the integrating sphere 1. Further, a baffle 11 is arranged in the integrating sphere 1, an optical beam splitter 12 is arranged in front of the LED light source 4-1, and a monitoring device 13 is used for measuring monitoring beams split by the optical beam splitter 12.

(14) An integrating sphere photometer spectral response measurement method comprises the following steps: (1) the LED light source 4-1 adopts various monochromatic LEDs as reference light sources, and emits light with three or more specified bands and overlapping spectra; (2) the light emitted from the LED light source 4-1 sequentially is divided into measuring beams and monitoring beams through the optical beam splitter 12, the monitoring device 13 measures the monitoring beams, and the measuring beams are incident to the integrating sphere 1; (3) the photometric value M.sub.i(i=1, 2, . . . n) of mixed light in the integrating sphere is obtained through the broadband photodetector 2; (4) the relative spectral radiation flux of the light emitted from the LED light source 4-1 is obtained through the spectral radiometer 8; (5) the absolute spectral radiation flux P.sub.i(i=1, 2, . . . n)=E; A of the light incident to the integrating sphere by the LED light source 4-1 is calculated based on the irradiance Ej obtained by the calibration detector 9 and the area A of the incident diaphragm 10, and the relative spectral radiation flux value obtained by the spectral radiometer 8 is calibrated to obtain the total spectral radiation flux P.sub.i()(i=1, 2, . . . n) received by the integrating sphere photometer system; and (6) according to the photometric value M.sub.i and the calibrated total spectral radiation flux P.sub.i()(i=1, 2, . . . n) of the light emitted by the LED light source 4-1, the spectral responsivity S.sub.rel()(i=1, 2, . . . n) of the integrating sphere photometer is obtained by means of numerical solution:

(15) $\{\begin{array}{c}{}_{{}_1}^{{}_2}{P}_1\left(\right).Math.S_{\mathrm{rel}}\left(\right)=M_1\\ .Math.\\ {}_{{}_{2n-1}}^{{}_{2n}}{P}_n\left(\right).Math.S_{\mathrm{rel}}\left(\right)=M_n\end{array}.$

Embodiment 4

(16) An embodiment of an integrating sphere photometer spectral response measurement system provided by the invention is shown in FIGS. 1 and 5. Compared with Embodiment 1, the reference light source is a laser device 4-2, and an attenuation device 5 and a light diffusion device 6 are added.

(17) An integrating sphere photometer spectral response measurement method comprises the following steps: (1) the laser device 4-2 emits lasers with a characteristic wavelength; (2) the spectral power flux P.sub.i()(i=1, 2, . . . n) of the light emitted by the laser device 4-2 is obtained in advance; (3) the lasers emitted by the laser device 4-2 pass through the attenuation device 5 and are incident to the integrating sphere 1, and the power density of the lasers is reduced through the light diffusion device 6; (4) the photometric value M.sub.i(i=1, 2, . . . n) of light in the integrating sphere is obtained through the broadband photodetector 2; and (5) according to the photometric value M.sub.i and spectral radiation flux P.sub.i() of the light emitted by the laser device 4-2, the spectral responsivity S.sub.rel()(i=1, 2, . . . n) of the integrating sphere photometer is obtained by means of numerical solution:

(18) $\{\begin{array}{c}{}_{{}_1}^{{}_2}{P}_1\left(\right).Math.S_{\mathrm{rel}}\left(\right)=M_1\\ .Math.\\ {}_{{}_{2n-1}}^{{}_{2n}}{P}_n\left(\right).Math.S_{\mathrm{rel}}\left(\right)=M_n\end{array}.$

(19) The specific embodiments of the invention have been described above with reference to the attached drawings, but it should be understood by those skilled in the art that the above embodiments are only for illustration, and are not intended to limit the scope of the invention. It should be understood by those skilled in the art that the above embodiments can be modified without departing from the scope and spirit of the invention. The scope of protection of the invention is defined by the appended Claims.