CN114061768A - Integrating sphere type light source color temperature calibration device and color temperature meter calibration method - Google Patents
Integrating sphere type light source color temperature calibration device and color temperature meter calibration method Download PDFInfo
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Abstract
The invention discloses an integrating sphere type light source color temperature calibration device which comprises an integrating sphere type light source color temperature source, a direct current stabilized power supply, a photometer, a spectrometer, an optical fiber and a computer. The integrating sphere type light source color temperature source comprises a standard light source, an adjustable incident light quantity diaphragm, a diffuse reflection integrating sphere and a color temperature raising filter, wherein the standard light source is connected with a direct current stabilized power supply; the diffuse reflection integrating sphere comprises a light inlet, a light outlet, a first light outlet monitoring port and a second light outlet monitoring port, a diaphragm capable of adjusting the incident light quantity is arranged between the standard light source and the light inlet of the diffuse reflection integrating sphere, and the photometer is connected with the first light outlet monitoring port; the spectrometer is connected with the second light-emitting monitoring port through an optical fiber, and the computer is connected with the spectrometer. A color temperature table calibration method based on the calibration device is also provided. The invention can realize the random adjustment and output of the standard color temperature of the light source between 2000K and 9500K, the real-time display of the standard color temperature value of the light outlet and the adjustment of the illumination value of the light outlet.
Description
Technical Field
The invention belongs to the field of metering and calibrating of a light source color temperature meter, and particularly relates to an integrating sphere type light source color temperature calibrating device and a color temperature meter metering and calibrating method based on the integrating sphere type light source color temperature calibrating device.
Background
Color temperature is also called color temperature or light source color temperature. If the color (i.e. light color, also called chromaticity) of light emitted by a light source is the same as the color of light emitted by a black body at a certain temperature, the absolute temperature value of the black body is called the color temperature (color temperature for short) of the light source. The relative spectral power distribution of the black body emitted light is given by planck's law equation (2):
wherein: t- - -blackbody temperature (K); λ - - - -wavelength (nm); c. C1A first radiation constant, c1＝3.7417749×10-16W/m2；c2A second radiation constant, c2＝1.4388×10-2m·K。
When the spectral power distribution of light emitted by a light source is different from a black body, the concept of "correlated color temperature" is commonly used to describe the color of the light source. The definition of correlated color temperature is: in a certain uniform chromaticity diagram, if a light source has the closest same light color as a black body at a certain temperature, the absolute temperature value of the black body is called the correlated color temperature of the light source.
The color temperature table is an instrument for measuring the correlated color temperature of the light source, and is an instrument for measuring the color characteristic of the light source and representing the color by the correlated color temperature. It is widely used for measuring the relevant color temperature of lighting sources for photography and camera shooting and other modern light sources. According to the technical requirements of the national metrological verification regulation of the current effective JJG212-2003 color temperature table, the metering calibration method of the traditional color temperature table is that on a guide rail with the length of more than (2-3) meters, color temperature standard lamps of different types are directly used for metering the color temperature value of the color temperature table at 2000K-3400K; and at 3400K-9500K, measuring the color temperature value of the color temperature meter by adopting a method of adding a color temperature standard lamp and a color temperature raising filter, thereby meeting the calibration requirement of the color temperature meter in the range of 2000K-9500K. Firstly, the device and the calibration method occupy large room area, and place a high-precision (2-3) meter straight light rail and an alignment device in a place requiring a certain area; secondly, the calibration process is tedious and takes long time, the color temperature standard lamp needs to be replaced in different color temperature ranges, and the light path needs to be recalibrated after replacement. More importantly, the standard lamp with the color temperature required by the national metrological verification regulation of JJJG 212-2003 color temperature table has limited service life, complex production, manufacture and debugging process and low price, is in a state of short supply for a long time in China and is difficult to obtain. Especially for many calibration mechanisms or enterprises and public institutions with self-calibration requirements, it is very difficult to purchase color temperature standard lamps required by the traditional color temperature standard devices, and meanwhile, the color temperature standard lamps are difficult to carry out hand-held inspection every year (the color temperature standard lamps belong to precise instruments and are extremely afraid of various vibrations), so that a substitute scheme for easily realizing magnitude transmission needs to be researched.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings of the prior art, and provides an integrating sphere type light source color temperature calibration device and a color temperature meter calibration method based on the device, wherein the color temperature of 2000K-9500K can be adjusted at will, the color temperature of a light outlet can be displayed in real time through a spectrometer monitoring system, and meanwhile, the illumination value of the light outlet can be adjusted.
In order to realize the purpose of the invention, the integrating sphere type light source color temperature calibration device provided by the invention comprises an integrating sphere type light source color temperature source, a direct current stabilized power supply for lightening a standard light source, a photometer, a spectrometer and a computer for receiving spectrum test data of the spectrometer for measuring mixed light in an integrating sphere,
the integrating sphere type light source color temperature source comprises a standard light source, a diaphragm capable of adjusting the incident light quantity, a diffuse reflection integrating sphere and a replaceable color temperature raising filter,
the standard light source is connected with the direct current stabilized voltage power supply and is provided with a reflecting cover;
the diffuse reflection integrating sphere comprises a light inlet, a light outlet, a first light outlet monitoring port and a second light outlet monitoring port, an adjustable incident light quantity diaphragm is arranged between the standard light source and the light inlet of the diffuse reflection integrating sphere, and when the light outlet color temperature of the diffuse reflection integrating sphere is 3000K-9500K, a color temperature raising filter is further arranged at the light outlet;
the photometer is connected with the first light-emitting monitoring port and is used for measuring the mixed light-emitting illumination intensity in the integrating sphere;
the spectrometer is connected with the second light-emitting monitoring port through an optical fiber and is used for measuring the mixed light-emitting spectrum in the integrating sphere;
the computer is connected with the spectrometer.
The standard light source is used for adjusting the luminous color temperature value, the light source is reflected into the diffuse reflection integrating sphere through the reflecting cover, and the size of the diaphragm can be adjusted through the adjusting diaphragm through the knob, so that the quantity of the light entering quantity is adjusted. When the emergent light color temperature is in the range of 2000K-3000K, a color temperature raising filter is not required to be placed, a color temperature meter to be calibrated is placed at the emergent light port of the integrating sphere, and the emergent light color temperature value is measured; and placing a color temperature raising filter in the range of 3000K-9500K of the emergent light color temperature, placing a color temperature meter to be calibrated at the emergent light port of the integrating sphere, and measuring the emergent light color temperature value. The light-emitting color temperature value is displayed by the computer system in real time.
Further, the standard light source is a halogen lamp. The halogen lamp inputs current through a direct current power supply to adjust the luminous color temperature value. The emission spectrum of the halogen lamp is a continuous spectrum, and is similar to the emission spectrum of a black body and a color temperature standard lamp used in the national metrological verification regulation of JJJG 212-2003 color temperature table; and the luminous color temperature of most halogen lamps can meet the range of 2000K-3200K, and the luminous color temperature after multiple diffuse reflection by the integrating sphere can meet the requirement of 2000K-3000K.
Furthermore, a light inlet light barrier is arranged between the light inlet of the diffuse reflection integrating sphere and the diaphragm capable of adjusting the incident light quantity. The light inlet light barrier can rapidly and completely shield incident light, so that the emergent light source of the integrating sphere type light source color temperature calibration device is zero.
Further, a light baffle plate in the integrating sphere is arranged between the two hemispheres of the diffuse reflection integrating sphere. The light barrier in the integrating sphere is mainly used for directly shielding incident light entering the integrating sphere and preventing the incident light from directly emitting through the light outlet without diffuse reflection, and aims to ensure that the emergent light is uniformly emitted after being mixed through multiple times of diffuse reflection in the integrating sphere.
Further, the inner wall of the diffuse reflection integrating sphere is coated with diffuse reflection paint.
And when the color temperature raising filter is arranged, the color temperature raising filter is fixedly arranged on the color temperature raising filter bracket.
Furthermore, a color temperature raising filter bracket is fixedly arranged on the diffuse reflection integrating sphere, a slot is arranged on the color temperature raising filter bracket, and the color temperature raising filter is inserted in the slot. The color temperature raising filter is arranged on the color temperature raising filter bracket in an inserting mode, the color temperature raising filter can be conveniently taken out when the color temperature raising filter does not need to be arranged, and the color temperature raising filter can be conveniently inserted when the color temperature raising filter needs to be arranged.
Furthermore, the first light-emitting monitoring port and the second light-emitting monitoring port form a symmetrical included angle with the light-emitting normal of the device, and the angle range of the symmetrical included angle is 30-60 degrees. The central normals of the two monitoring ports are converged at the center of the light barrier in the integrating sphere, so that the emergent light can be collected.
The invention also provides a color temperature meter calibration method for calibrating by adopting the device, which comprises the following steps:
a standard light source is ignited by using a direct current stabilized power supply, after the output current value is stable, the light inlet quantity of the diffuse reflection integrating sphere is controlled through an adjustable incident light quantity diaphragm, and the illumination of the photometer is controlled within the range of 100-1500 lx;
when the light emitting color temperature of the diffuse reflection integrating sphere is in the range of 2000K-3000K, a color temperature raising filter is not arranged, a color temperature meter to be calibrated is arranged at the light emitting port of the integrating sphere, a spectrometer calibrated by a spectral irradiance standard lamp is used for measuring the light emitting spectrum of the diffuse reflection integrating sphere in real time through a second light emitting monitoring port, and the color temperature value of the diffuse reflection integrating sphere is calculated and displayed in a computer in real time and is the standard color temperature value required by calibration;
when the light-emitting color temperature of the diffuse reflection integrating sphere is within the range of 3000K-9500K, a color temperature raising filter is arranged at the light-emitting port of the diffuse reflection integrating sphere, a color temperature table to be calibrated is arranged at the light-emitting port of the diffuse reflection integrating sphere and is added with the color temperature raising filter, the light-emitting spectrum of the diffuse reflection integrating sphere is measured in real time through a second light-emitting monitoring port by using a spectrometer, the spectral power distribution of the light-emitting light added with the color temperature raising filter is obtained, the computer obtains the spectral power distribution P (lambda) of the light-emitting light added with the color temperature raising filter in real time, the light-emitting color temperature added with the color temperature raising filter is calculated and displayed in the computer, and the color temperature value is a standard color temperature value required for calibration.
Further, the spectral power distribution of the light emitted after the color temperature increasing filter is obtained through a formula (3), wherein the formula (3) is
P(λ)＝τ(λ)·T(λ) (3)
Wherein lambda is the wavelength, P (lambda) is the spectral power distribution of the light emitted after the color temperature raising filter is added, tau (lambda) is the spectral transmittance of the color temperature raising filter, and T (lambda) is the light spectrum of the spectrometer for measuring the light emitted from the integrating sphere in real time through the port B.
Compared with the prior art, the invention at least has the following beneficial effects:
(1) the invention provides a method for calibrating a color temperature meter by using an integrating sphere type light source color temperature source. The invention selects a standard light source and a diffuse reflection integrating sphere as uniform light source output to replace a color temperature standard lamp, and realizes the random stepless regulation of the emergent color temperature of 2000K-3000K by the real-time regulation control of the driving current of the standard light source; the color temperature of the emergent light larger than 3000K-9500K can be adjusted randomly and steplessly by matching with a color filter with raised color temperature and placing the color filter at the light outlet. The integrating sphere type light source color temperature calibration device can realize random stepless regulation and output of a standard light source in a color temperature measurement range of 2000K-9500K required by a verification regulation of JJG212-2003 color temperature table. The realization is traced to the source to the quantity value of colour temperature table measuring equipment, need not frequently change color temperature standard lamp, reduces the loss and the reliance to color temperature standard lamp to satisfy the reproduction and the quantity value requirement of tracing to non-fixed point colour temperature.
(2) The invention provides a method for transferring the quantity value of a color temperature meter by directly using a spectrometer (spectrum comparison device) calibrated by a spectrum irradiance standard lamp. The traditional color temperature magnitude calibration is that the magnitude of the color temperature auxiliary reference is transmitted to a color temperature standard lamp by using a spectrum comparison device, the color temperature standard lamp calibrates a color temperature meter (magnitude transmission), and the magnitude is transmitted at least twice. The invention innovatively provides that a spectrometer calibrated by a spectral irradiance standard lamp is used for directly measuring the color temperature in an integrating sphere. The specific method is that a second light-emitting monitoring port is arranged near a light-emitting port of the integrating sphere and is connected to the spectrometer through an optical fiber. Firstly, calibrating a spectrum measurement part of a spectrometer (spectrum comparison device) by a spectrum irradiance standard lamp; and then measuring the spectrum of the mixed light in the ball through a spectrometer, selecting a used color temperature rising filter in measurement software, weighting and calculating the light source spectrum at the light outlet in the ball and the transmission spectrum curve of the color temperature rising filter through a computer system to obtain a color temperature value, and displaying the color temperature value on a screen in real time. And calculating to obtain the standard color temperature value of the light outlet with or without the additional color temperature raising filter.
(3) The invention adopts an adjustable diaphragm design. The invention adds the adjusting diaphragm of the integrating sphere light inlet, thereby achieving the purpose of controlling the illuminance of the light outlet, eliminating the dependence on a guide rail in the calibration of the color temperature meter and providing technical support for the measurement and tracing of the color temperature meter at the same illuminance level.
(4) An integrating sphere type light source color temperature calibration device is selected to calibrate the color temperature value of the color temperature meter, and a new idea is provided for the transmission of the color temperature value of the color temperature meter. The integrating sphere type light source of the integrating sphere type light source color temperature calibration device has the advantages of small size, long service life and the like, and a standard color temperature lamp does not need to be frequently replaced, so that the loss and dependence on the color temperature standard lamp are reduced, and the requirements on recurrence and magnitude traceability of non-fixed point color temperature are met.
(5) Through this calibrating device, can replace traditional color temperature standard lamp completely and carry out the quantity transfer to the colour temperature table.
Drawings
Fig. 1 is a schematic diagram of a calibration apparatus according to an embodiment of the present invention.
Fig. 2 is an exploded view of an integrating sphere type light source color temperature source on the calibration device according to the embodiment of the present invention.
Fig. 1 and 2 include: the device comprises an integrating sphere type light source color temperature source 1, a photometer 2, a direct current stabilized power supply 3, a spectrometer 4, a computer 5, an optical fiber 6, a standard light source 7, an adjustable incident light quantity light 8, a diffuse reflection integrating sphere 9, a light blocking plate 10 in the integrating sphere, a second light emitting monitoring port 11, a first light emitting monitoring port 12, a color temperature raising filter 13, a color temperature raising filter bracket 14 and a light inlet light blocking plate 15.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 and fig. 2, the integrating sphere type light source color temperature calibration device provided by the present invention includes an integrating sphere type light source color temperature source 1, a dc regulated power supply 3 for lighting a standard light source 7, a photometer 2 for measuring mixed light illuminance in the integrating sphere, a spectrometer 4 calibrated by a spectral irradiance standard lamp for measuring mixed light spectrum in the integrating sphere, a computer 5 for receiving spectrometer spectrum test data for measuring mixed light in the integrating sphere, and an optical fiber 6.
The integrating sphere type light source color temperature source 1 comprises a standard light source 7, an adjustable incident light quantity diaphragm 8, a diffuse reflection integrating sphere 9 (hereinafter, integrating sphere) and a replaceable color temperature raising filter 13, wherein the standard light source 7 is connected with a direct current stabilized power supply 3, and a reflecting cover is arranged on the standard light source 7; the diffuse reflection integrating sphere 9 comprises a light inlet, a light outlet, a first light outlet monitoring port 12 and a second light outlet monitoring port 11, the diaphragm 8 capable of adjusting the incident light quantity is arranged between the standard light source 7 and the light inlet of the diffuse reflection integrating sphere 9, and when the light outlet color temperature of the diffuse reflection integrating sphere 9 is 3000K-9500K, a color temperature raising filter 13 is further arranged at the light outlet; the photometer 2 is connected with the first light-emitting monitoring port 12 and is used for measuring the mixed light-emitting illumination intensity in the integrating sphere; the spectrometer 4 is connected with the second light-emitting monitoring port 11 through an optical fiber 6 and is used for measuring the mixed light-emitting spectrum in the integrating sphere; the computer 5 is connected to the spectrometer 4. Wherein, the first light-emitting monitoring port 12 and the second light-emitting monitoring port 11 form a symmetrical included angle with the light-emitting normal of the device, and the angle range of the symmetrical included angle is 30-60 degrees. When the emergent light color temperature of the diffuse reflection integrating sphere needs to be 2000K-3000K, emergent light is directly output through the light outlet, when the emergent light color temperature of the diffuse reflection integrating sphere needs to be 3000K-9500K, a color temperature raising filter is arranged at the light outlet, and the emergent light is output after passing through the color temperature raising filter through the light outlet.
In one embodiment of the invention, the standard light source 7 is a halogen lamp.
In one embodiment of the present invention, a light inlet light barrier 15 is further disposed between the light inlet of the diffuse reflection integrating sphere 9 and the diaphragm 8 capable of adjusting the incident light quantity.
In one embodiment of the invention, an integrating-sphere internal light baffle plate 10 is arranged between two hemispheres of the diffuse reflection integrating sphere 9.
In one embodiment of the present invention, the inner wall of the diffuse reflection integrating sphere 9 is coated with a diffuse reflection paint.
In one embodiment of the present invention, the color temperature raising filter bracket 14 is further included, the color temperature raising filter bracket 14 is fixed on the diffuse reflection integrating sphere 9 and is located outside the light outlet of the diffuse reflection integrating sphere 9, and the inner side of the diffuse reflection integrating sphere 9 is provided with a slot for fixing the color temperature raising filter 13.
In the calibration device provided by the embodiment, when the emergent color temperature is in the range of 2000K to 3000K, a color temperature raising filter is not required to be placed, the color temperature table to be calibrated is placed at the emergent opening of the integrating sphere, and the emergent color temperature value is measured; and placing a color temperature raising filter to raise the light-emitting color temperature of the integrating sphere when the light-emitting color temperature is within the range of 3000K-9500K, placing a color temperature meter to be calibrated at the light-emitting opening of the integrating sphere, and measuring the light-emitting color temperature value. The standard light emitting value is displayed by the computer system in real time.
In the embodiment of the invention, a single halogen lamp is used as a standard light source, and the single halogen lamp enters an integrating sphere with an adjustable diaphragm after being directly irradiated by the standard light source and reflected and mixed by a reflecting cover; the integrating sphere is formed by spraying diffuse reflection coating with high reflectance, the brightness distribution of the integrating sphere is close to that of a complete diffuser, the spectral flatness of a visible light region is superior to 5%, and incident light of the integrating sphere is mixed and diffusely reflected for multiple times through the integrating sphere to uniformly emit light; the integrating sphere light-emitting illumination is measured in real time through the first light-emitting monitoring port by a photometer, the integrating sphere light-emitting spectrum data is measured in real time through the second light-emitting monitoring port by a spectrometer, the light-emitting color temperature is calculated in real time and displayed in a computer, different color temperature integrating sphere mixed light-emitting light sources are obtained by controlling the driving current of the standard light source in real time, and the mixed light-emitting color temperature is stepless adjustable between 2000K and 3000K when the color temperature rising standard color filter is not placed; when the color filter with the color temperature rising standard is placed, a spectrum obtained by superposing an integrating sphere light-emitting spectrum and a known transmission spectrum of the color temperature rising filter is measured in real time by a spectrometer through a second light-emitting monitoring port, the color temperature of transmitted light obtained by combining the integrating sphere mixed light-emitting spectrum and the color temperature rising filter is obtained through real-time weighting calculation and is displayed in a computer system, and the color temperature of the mixed transmitted light is stepless adjustable at 3000K-9500K.
The invention also provides a color temperature meter calibration method for calibrating by adopting the device.
In one embodiment of the present invention, a color temperature table calibration method is provided, which includes the following steps:
step 1: a standard light source 7 is ignited by using a direct current stabilized power supply 3, after the output current value is stable, the light inlet quantity of a diffuse reflection integrating sphere 9 is controlled by an adjustable incident light quantity diaphragm 8, so that the illumination of the photometer 2 is controlled within the range of 100-1500 lx;
step 2: when the light emitting color temperature of the diffuse reflection integrating sphere 9 is in the range of 2000K-3000K, a color temperature raising filter is not arranged, a color temperature meter to be calibrated is arranged at the light emitting port of the integrating sphere, the light emitting spectrum of the diffuse reflection integrating sphere 9 is measured in real time through a second light emitting monitoring port 11 by using a spectrometer 4 calibrated by a spectral irradiance standard lamp, and the color temperature value of the diffuse reflection integrating sphere 9 is calculated and displayed in a computer in real time, wherein the color temperature value is the standard color temperature value required by calibration;
and step 3: when the emergent light color temperature of the diffuse reflection integrating sphere 9 is within the range of 3000K-9500K, a color temperature raising filter 13 is arranged at the emergent light port of the diffuse reflection integrating sphere 9, a color temperature table to be calibrated is arranged between the emergent light port of the diffuse reflection integrating sphere 9 and the color temperature raising filter 13, the spectrometer 4 calibrated by a spectral irradiance standard lamp is used for measuring the emergent light spectrum of the diffuse reflection integrating sphere 9 in real time through a second emergent light monitoring port 11 to obtain the spectral power distribution of the emergent light after the color temperature raising filter 13 is added, a computer obtains the spectral power distribution P (lambda) of the emergent light after the color temperature raising filter is added in real time, the emergent light color temperature after the color temperature raising filter 13 is calculated and displayed in the computer, and the color temperature value is the standard color temperature value required by calibration.
In the step 3, the spectral power distribution of the light emitted after the color temperature raising filter 13 is added is obtained through a formula (4), wherein the formula (4) is
P(λ)＝τ9λ)·T(λ) (4)
In the formula: wherein lambda is the wavelength, P (lambda) is the spectral power distribution of the light emitted after the color temperature raising filter is added, tau (lambda) is the spectral transmittance of the color temperature raising filter, and T (lambda) is the light spectrum of the spectrometer for measuring the light emitted from the integrating sphere in real time through the port B.
As can be seen from table 1, when the color temperature meter is calibrated by the symmetric color temperature calibration device provided by the present invention, compared with the prior art, the measured values measured by the present invention are very close to each other, and are much smaller than the measurement uncertainty, which illustrates the effectiveness of the present invention.
Table 1 comparison of the measurement results of the present invention with those of the prior art
As described above, the present invention proposes to calibrate (magnitude transfer) the color temperature table directly using the color temperature standard device of the integrating sphere light source. The traditional color temperature magnitude tracing graph is that the magnitude of a color temperature auxiliary reference is transmitted to a standard color temperature lamp by using a spectrum comparison device, the standard color temperature lamp calibrates a color temperature table (magnitude transmission), and the magnitude is transmitted at least twice. The invention innovatively provides a method for calibrating the color temperature of a color temperature meter by using an integrating sphere light source color temperature standard device. The system solves the problem that the standard light source is randomly and steplessly regulated to output within the color temperature measurement range of 2000K-9500K, realizes the quantity value tracing of the color temperature meter measuring equipment, does not need to frequently replace the standard color temperature lamp, reduces the loss and the dependence on the standard color temperature lamp, and meets the requirements of reproduction of non-fixed point color temperature and quantity value tracing.
The embodiments of the present invention are not limited to the above-described embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and they are included in the scope of the present invention.
Claims (10)
1. An integrating sphere type light source color temperature calibration device is characterized by comprising an integrating sphere type light source color temperature source (1), a photometer (2), a direct current stabilized power supply (3), a spectrometer (4), a computer (5) and an optical fiber (6),
the integrating sphere type light source color temperature source (1) comprises a standard light source (7), an adjustable incident light quantity diaphragm (8), a diffuse reflection integrating sphere (9) and a replaceable color temperature raising filter (13),
the standard light source (7) is connected with the direct current stabilized voltage power supply (3), and a reflecting cover is arranged on the standard light source (7);
the diffuse reflection integrating sphere (9) comprises a light inlet, a light outlet, a first light outlet monitoring port (12) and a second light outlet monitoring port (11), an adjustable incident light quantity diaphragm (8) is arranged between the standard light source (7) and the light inlet of the diffuse reflection integrating sphere (9), and when the light outlet color temperature of the diffuse reflection integrating sphere (9) is 3000K-9500K, a color temperature raising filter (13) is further arranged at the light outlet;
the photometer (2) is connected with the first light-emitting monitoring port (12) and is used for measuring the mixed light-emitting illumination intensity in the integrating sphere;
the spectrometer (4) is connected with the second light-emitting monitoring port (11) through an optical fiber (6) and is used for measuring the mixed light-emitting spectrum in the integrating sphere;
the computer (5) is connected with the spectrometer (4).
2. An integrating sphere type light source color temperature calibration device according to claim 1, characterized in that the standard light source (7) is a halogen lamp.
3. The integrating sphere type light source color temperature calibration device according to claim 1, characterized in that a light inlet light barrier (15) capable of being inserted and drawn is further arranged between the light inlet of the diffuse reflection integrating sphere (9) and the diaphragm (8) capable of adjusting the incident light quantity.
4. An integrating sphere type light source color temperature calibration device according to claim 1, characterized in that an integrating sphere inner light barrier (10) is arranged between two hemispheres of the diffuse reflection integrating sphere (9).
5. The integrating sphere type light source color temperature calibration device according to claim 1, wherein the inner wall of the diffuse reflection integrating sphere (9) is coated with diffuse reflection paint.
6. The integrating sphere type light source color temperature calibration device according to claim 1, further comprising a color-raising filter holder (14), wherein the color-raising filter holder (14) is disposed outside the light outlet of the diffuse reflection integrating sphere (9), and when the color-raising filter (13) is disposed, the color-raising filter (13) is fixedly disposed on the color-raising filter holder (14).
7. The integrating sphere type light source color temperature calibration device according to claim 6, wherein the color temperature raising filter bracket (14) is fixedly arranged on the diffuse reflection integrating sphere (9), and a slot is arranged on the color temperature raising filter bracket (14), and the color temperature raising filter (13) is inserted into the slot.
8. The integrating sphere type light source color temperature calibration device according to any one of claims 1 to 7, wherein the first light-emitting monitoring port (12) and the second light-emitting monitoring port (11) are symmetrically included with the light-emitting normal of the device, and the angle of the symmetric included angle is in the range of 30 ° to 60 °.
9. A color temperature meter calibration method, characterized in that an integrating sphere type light source color temperature calibration device according to any one of claims 1-8 is adopted, the method comprises the following steps:
a standard light source (7) is ignited by using a direct current stabilized power supply (3), after the output current value is stable, the light inlet quantity of a diffuse reflection integrating sphere (9) is controlled by an adjustable incident light quantity diaphragm (8), so that the illumination of a photometer (2) is controlled within the range of 100-1500 lx;
when the light-emitting color temperature of the diffuse reflection integrating sphere (9) is in the range of 2000K-3000K, a color temperature raising filter is not arranged, a color temperature meter to be calibrated is arranged at the light-emitting port of the integrating sphere, a spectrometer (4) calibrated by a spectral irradiance standard lamp is used for measuring the light-emitting spectrum of the diffuse reflection integrating sphere (9) in real time through a second light-emitting monitoring port (11), and the color temperature value of the diffuse reflection integrating sphere is calculated and displayed in a computer in real time;
when the light-emitting color temperature of the diffuse reflection integrating sphere (9) is within the range of 3000K-9500K, a color temperature raising filter (13) is arranged at the light-emitting port of the diffuse reflection integrating sphere (9), a color temperature table to be calibrated is arranged between the light-emitting port of the diffuse reflection integrating sphere (9) and the color temperature raising filter (13), the light-emitting spectrum of the diffuse reflection integrating sphere (9) is measured in real time through a second light-emitting monitoring port (11) by using a spectrometer (4), the spectral power distribution of the light-emitting light after the color temperature raising filter (13) is added is obtained, the spectral power distribution P (lambda) of the light-emitting light after the color temperature raising filter is added is obtained in real time by a computer, the light-emitting color temperature after the color temperature raising filter (13) is calculated and displayed in the computer, and the color temperature value is a standard color temperature value required by calibration.
10. The method of claim 9, wherein the spectral power distribution of the light emitted after the color temperature raising filter (13) is obtained by formula (1), wherein formula (1) is:
P(λ)＝τ(λ)·T(λ) (1)
wherein lambda is the wavelength, P (lambda) is the spectral power distribution of the light emitted after the color temperature raising filter is added, tau (lambda) is the spectral transmittance of the color temperature raising filter, and T (lambda) is the light spectrum of the spectrometer for measuring the light emitted from the integrating sphere in real time through the port B.
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