Antón Juan Carlos Martinez, Silva-López Manuel
Departamento de Óptica, Escuela Universitaria de Óptica, Universidad Complutense de Madrid, Madrid, Spain.
Opt Express. 2011 Dec 19;19(27):26079-87. doi: 10.1364/OE.19.026079.
An enhanced optical system design for NDIR gas detection is presented. Multiple paths lengths within the same cavity are used to auto reference the system. The system has good thermo-mechanical stability: it requires no special thermal stabilization, shows no sensitivity to thermal emitter drift and has no moving parts involved. Long term stability, virtually no zero-drift and sub-ppm level gas detection were achieved using commercial thermopile sensors and a thermal emitter modulated at low frequency (~0.5 Hz). Experimental tests were performed using carbon monoxide (CO) and a 30.5 cm cavity length. The design can be extended to allow multiple gas detection within the same optical cavity.
提出了一种用于非分光红外（NDIR）气体检测的增强型光学系统设计。同一腔体内采用多个光程长度来自动校准系统。该系统具有良好的热机械稳定性：无需特殊的热稳定措施，对热辐射源漂移不敏感且不涉及移动部件。使用商用热电堆传感器和低频（约0.5Hz）调制的热辐射源实现了长期稳定性、几乎无零漂以及亚ppm级别的气体检测。使用一氧化碳（CO）和30.5厘米的腔长进行了实验测试。该设计可扩展以允许在同一光学腔内进行多种气体检测。
