Spectral responsivity calibrating method and device

Abstract

The invention discloses a spectral responsivity calibrating method and device. Through the combination of a continuously-adjustable single-wavelength radiation source, a laser device capable of outputting more than one discrete-wavelength laser and an optical mixer, the measurement of spectral irradiance and spectral radiance can be achieved, and a spectral responsivity curve can be calibrated through discrete spectral responsivity so as to improve accuracy of measurement. The spectral responsivity calibrating device has the advantages of being simple in structure, complete in function, high in cost-performance ratio, convenient to operate, popularize and use and the like.

Description

【Technical field】 [0001] The invention belongs to the field of optical radiation measurement, and in particular relates to a spectral responsivity calibration method and device. 【Background technique】 [0002] Spectral responsivity is one of the basic properties of optical radiation detectors, which characterizes the response of optical radiation detectors to incident radiation of different wavelengths. Optical radiation detectors can only be used for the measurement of absolute spectral values ​​after being calibrated with spectral responsivity, and the size of the calibration uncertainty of spectral responsivity is the key to determining the accuracy of optical radiation detector measurement results. [0003] Spectral responsivity calibration generally has two methods based on standard radiation sources and based on standard detection devices. For a long time, the standard of spectral radiation has been established on the basis of radiation sources (black bodies and stand...

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Problems solved by technology

[0004] The SCF system uses a combination of a common light source and a monochromator as the radiation source. Due to the low power of the common light source, the energy of the monochromatic light output by the monochromator is weak, and it is difficult to be accurately detected and measured. The light is focused on the detector by means of focusing imaging, etc., but in this scheme, the inhomogeneity of the beam and the detector has a great influence on the uncertainty of the measurement results, and the imaging structure is complex, and the stray light introduced Larger, the power response error is large; more importantly, because the focus imaging measurement is the power response value, it is impossible to directly calibrate the spectral radiance and spectral irradiance

[0005] The SIRCUS system uses multiple sets of tunable lasers to provide high-power monochromatic light. After power stabilization, spectrum analysis, wavelength measurement, chopping and other processes, it is combined with multiple integrating spheres of different sizes to obtain a uniformly distributed stable radiation source. Although the The system can directly calibrate the power, spectral irradiance and spectral radiance response value, but the calibration of different values ​​needs to cut into integrating spheres of different sizes, which is inconvenient to operate; in addition, its spectrum analysis and wavelength measurement also introduce Michelson Precision devices such as Fabry–Perot interferometers are not only complex in structure, but also costly to use and maintain multiple sets of tunable lasers, interferometers, and multiple integrating spheres. So far, they have not been popularized and applied. Even in the highest metrology institution in the country, also unaffordable

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