A comparison measurement of absolute power responsivity of silicon photodetector between He-Ne laser and supercontinuum white light source has been realized recently. The power responsivity of silicon trap detector at 632.8nm has been transferred from NIM’s primary optical power standard-the absolute cryogenic radiometer. A 0.07% difference was present for the two different light sources at the same wavelength. Also, a series of experiments related to the comparison have been done including measurement of source power stability, detector polarization dependence, uniformity, and angular dependence. At last, the measurement uncertainty of the comparison is analyzed.
A new comparator facility for spectral responsivity calibration of InGaAs photodiode based on cryogenic radiometer fundamental has been set up at the National Institute of Metrology of China (NIM). The comparator employed a stable supercontinuum light source, a prime-grating monochromator, a reliable 5-axis stage and some necessary optics as its main construction components. The supercontinuum source, monochromator and some beam path were also commonly utilized by the cryogenic radiometer, which was designed to minimize the deviations to the calibration procedure introduced by these components. The spectral responsivity of the InGaAs photodiode in the spectral range 900nm- 1600nm was determined. The repeatability obtained by this new comparator is one decade better than that of former InGaAs measurement facility. NIM has been better supported to finish the measurements of transfer detectors of key comparison of CCPR-K2.a.2016 by this new and accuracy comparator.
The effects of monochromatic light modes and filtering systems on the measurement of spectral responsivity of photovoltaic(PV) modules are analyzed. According to the structure characteristics of PV modules, a PV module spectral responsivity measurement device was established based on the steady-state monochrome light source, main bias light source, auxiliary bias light source and phase-locked filter testing system. The nondestructive testing of spectral responsivity of solar cells in PV module was realized. The effects of irradiance of main bias light source, irradiance of auxiliary bias light source and temperature of PV module on spectral responsivity and spectral mismatch factor are analyzed. The influence of different sampling monochrome spot area on the relative spectral response measurement of solar cells under small spot test conditions is analyzed. The spectral responsivity of the PV module slices was tested by using the small spot measurement system. The accuracy of the nondestructive measurement device is verified by comparing the nondestructive test results with the slice measurement results.
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