在實驗研究的基礎上分析了采用紅外發光二極管為光源的氣體傳感器在設計中應考慮的幾個因素。對四種設計方案進行了比較,從而提出了雙光源四探測器的新型多光路光學系統設計方案。采用這種光學系統不但可以對溫度、環境、氣室塵染、器件失配等引起的干擾進行補償,而且還可以對由光源發光功率和探測器響應度變化引起的傳感器靈敏度的波動進行補償。對新光學系統進行的實驗分析表明,該光學系統的長期工作穩定性和溫度穩定性都優于其它設計方案。
關鍵詞: 紅外氣體傳感器; 多光路; 光學系統
Abstract : Based on experiment study , several factors are analyzed in the design of infrared gas sensor in which infrared L ED is used as light source , and four schemes are compared in this paper. A new multi2pass optic system is constructed in which two sources and four detectors are used. The interference of environment and optic parts can be compensated very well in the system. The experiment analysis indicates that the long2time work stability and temperate stability are better than other schemes.
Key words : infrared gas sensor ; multi2pass ; optical system