Symmetrical color temperature calibration device and color temperature meter calibration method

Abstract

The invention discloses a symmetric color temperature calibration device, which comprises a symmetric integrating sphere color temperature source, a spectrograph, an optical fiber, a computer and a direct-current stabilized power supply, wherein the symmetric integrating sphere light source color temperature source comprises a standard light source, an adjustable incident light quantity diaphragm, a diffuse reflection integrating sphere, a replaceable color temperature increasing optical filter and a light outlet diaphragm sleeve; the standard light source is connected with the direct-current stabilized power supply; the diffuse reflection integrating sphere comprises a light inlet, a light outlet and a light outlet monitoring port, the adjustable incident light quantity diaphragm is arranged between the standard light source and the light inlet of the diffuse reflection integrating sphere, the light outlet diaphragm sleeve is arranged at the light outlet, and when the light outlet color temperature of the diffuse reflection integrating sphere is 3000K-9500K, the light outlet of the light outlet diaphragm sleeve is also provided with a color temperature rising light filter. The invention further provides a color temperature meter calibration method based on the calibration device. The standard color temperature of the light source can be randomly adjusted and output between 2000K and 9500K, and the color temperature value of the light outlet of the light outlet diaphragm sleeve is displayed in real time as a color temperature standard value.

Description

technical field [0001] The invention belongs to the field of measurement and calibration of light source color temperature meters, in particular to a symmetrical color temperature calibration device and a color temperature meter calibration method based on the calibration device. Background technique [0002] Color temperature, also known as color temperature or light source color temperature. If the color of light emitted by a light source (that is, light color, also known as chromaticity) is the same as the color of light emitted by a black body at a certain temperature, then the absolute temperature value of the black body at this time is called the color temperature of the light source (referred to as color temperature) . The relative spectral power distribution of light emitted by a blackbody is given by Planck's law (2): [0003] [0004] Among them: T ---- black body temperature (K); λ ---- wavelength (nm); c 1 ----First radiation constant, c 1 =3.7417749×10 -...

AI Technical Summary

Problems solved by technology

First of all, the device and the calibration method occupy a large room area, requiring a certain area to place a high-precision (2-3) meter flat light track and alignment device; secondly, the calibration process is cumbersome and time-consuming, and different color temperature ranges need to be replaced Color temperature standard lamp, the light path should be recalibrated after replacement

More importantly, according to the national metrology verification regulations of JJG212-2003 "Color Temperature Meter", the color temperature standard lamp has a limited lifespan, and the production and debugging process is relatively complicated.

Especially for many calibration institutions or enterprises and institutions with self-calibration needs, it is very rare to purchase the color temperature standard lamp required by the traditional color temperature standard device, and at the same time, the color temperature standard lamp must be hand-held for inspection every year (color temperature standard lamp It is a precision instrument, and I am afraid of various vibrations) is particularly difficult. It is necessary to study alternatives that are easier to achieve value transfer

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