Field spectrometers are widely applied in ground validation sites for remote sensing. However, the control of stray light is one of the most important factors to ensure accurate measurements, since the spectral distribution of target source differs significantly from the laboratory calibration source. Here, a simple UV stray light correction method for continuously distributed wide-spectrum light sources was established by using a set of bandpass filters. This analysis enabled a simple, low-cost method for correcting for the observed straylight.
The principle of the method for the BESIII TOF calibration using cosmic ray data without magnetic field are reported in this paper. After applying calibration constants, the single-end readout time resolution could reach about 150 ps, and the time resolution for one layer is achieved to be about 110 ps. The paper also described the extraction scheme for the event start time of cosmic events.
The spectral radiance of the lamps are calibrated in the experiment. Different from the spectral irradiance mode, the spectral radiance involves mirror imaging optics and some instructions must be followed strictly. During the experiment, several different imaging parameters in the spectral radiance transfer were investigated, such as the imaging area, the width of the entrance slits, the solid angle, and the object distance of the imaging optics.
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