Development of transmission visibility meter calibration device and analysis of measurement results

In order to solve the problem that the quantity value of visibility parameters at home and abroad cannot be absolutely traceable, the quantity value reclaiming method tracing to the geometry amount was proposed by using working principle, structural characteristics, and environmental conditions. A high transmission visibility instrument as the main standard device was designed to calibrate the transmission visibility meter, which promoted the development of visibility value to trace the origin system. The main standard device used precision processing technique, which followed the absolute traceability method of geometric parameter measurement, and could greatly reduce the measurement uncertainty of the transmission ratio. The traceability chain combined with measurement of geometry and optical transmittance parameter solved the problem that could not reproduce and accurately measure the high transmission ratio in existing technologies. In addition, the use of cone occulter could avoid the introduction of other sources of uncertainty except rotating factors, which greatly improved the calibration capability of the visibility meter resolution.