Tranchart S, Bachir I H, Destombes J L
Appl Opt. 1996 Dec 20;35(36):7070-4. doi: 10.1364/AO.35.007070.
We describe a simple spectrometer for sensitive trace gas detection in the atmosphere. A communication laser diode is used as a light source, and a commercial integrating sphere is used as a multipass absorption cell. We developed a theoretical formulation of the relative absorption of the optical power by trace gases in the sphere and applied it to two kinds of experimental result: one that is concerned with a structureless broad absorption band of butane with the use of a 1.2-μm multimode laser diode, and one that is related to the study of an isolated and sharp rovibrational line of water vapor in air at atmospheric pressure with the use of an 830-nm single-mode laser diode. With equivalent path lengths of several meters obtained with a 10-cm-i.d. integrating sphere we can demonstrate the usefulness of such a device as a broadband multipass cell for the measurement of small absorptions.
我们描述了一种用于大气中痕量气体灵敏检测的简易光谱仪。使用一个通信激光二极管作为光源，并用一个商用积分球作为多程吸收池。我们推导了积分球中痕量气体对光功率的相对吸收的理论公式，并将其应用于两类实验结果：一类是使用1.2μm多模激光二极管针对丁烷无结构宽吸收带的实验，另一类是使用830nm单模激光二极管在大气压下对空气中水蒸气孤立且尖锐的转动 - 振动谱线进行研究的实验。通过内径为10cm的积分球获得了等效路径长度达数米的结果，我们可以证明这种装置作为用于测量小吸收量的宽带多程吸收池的实用性。
