Three-channel filter-based non-imaging passive ranging system based on oxygen absorption

摘要

A three-channel filter-based non-imaging passive ranging system based on oxygen absorption is proposed and demonstrated. This system utilizes three band pass filters to quickly estimate the oxygen band-average transmission near 762 tun, and uses three simultaneous spectral measurement channels which are defined by the different band pass filters to capture the three band pass signals of the target. A short range experiment from 100 m to 300 m and a long range experiment at 1945 m are conducted with a 1000 W halogen lamp, and the measured band-average oxygen transmission of the both experiments are compared to the predicted curve derived from the line-by-line transmission model to estimate the range. Averaged range error of 2.14% is achieved in the short range experiment and range error of 6.72% is obtained in the long range experiment.