Calibration of measurement uncertainty of forward-scattering spectrometer probes

For the purpose of calibration of a forward-scattering spectrometer probe (FSSP), a pinhole-disc calibration apparatus was designed based on diffraction technology. After calculation and simulation of Mie scattering and Fraunhofer diffraction power, the conversion relationships between the pinhole diameter and aerosol particle size were gotten. Parameters of calibration apparatus were gained after calculation based on the conversion relationship. After theoretical analysis and experimental verification, measurement uncertainty of standard particles was delivered to cloud particle spectrometer probe. And then, after the experiment of rotating pinhole disc, measurement uncertainty was passed to the calibration apparatus. Experimental results of calibration apparatus verified theoretical analysis. The results show that calibration apparatus has feasible calibration scheme with high efficiency, large calibration range, good measurement discrete uniformity and good repeatability. The study is helpful for calibration technology of spectrometer probes.