Accurate measurement of the aperture area has always been the focus of optics and optical radiation measurement. The metrology institutes around the world have established absolute aperture area measurement facilities. In this paper, a measuring system of the aperture area based on optical flux comparison method is designed and implemented., which can transfer absolute values efficiently and accurately. The results show that the deviation between the area measured by optical flux comparison method and the area measured by effective area method is about 5×10-4 . The influences of the light source stability, irradiation field uniformity and aperture positioning difference on the measurement results are analyzed emphatically. The uncertainty of the measurement results is also evaluated, the relative expanded uncertainty is 9.9×10- 4 (k=2).
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.
With high quantum efficiency, low capacitance, low dark current and wide bandwidth, InGaAs detectors has lots of applications in optical radiation measurement, optical communication and remote sensing. This paper using a spectral comparison facility based on supercontinuum white light source and double monochromator, in which a reference InGaAs trap detector is used for the relative spectral responsivity calibration of a planar InGaAs detector. Calibration of the same detectors using tungsten lamp as light source has also been done and shows a good consistency, which proves the feasibility of relative spectral responsivity calibration using supercontinuum white light sources.
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