Trace gas detection by laser intracavity photothermal spectroscopy.
Trace gas detection by laser intracavity photothermal spectroscopy.
复制标题
激光腔内光热光谱法检测痕量气体。
DOI：
10.1364/ao.25.000749
复制
发表时间：
1986
期刊：
影响因子：
1.9
通讯作者：
Horn
中科院分区：
文献类型：
--
作者：
K. H. Fung;Horn
介绍了一种新型激光内腔式光热探测器。在该方案中，抽运激光功率的样品吸收发生在探针式He-Ne激光器的腔内，导致增益调制，进而导致输出功率调制。从实用性和灵敏度两个方面对这种内腔探测器与另外两种光热技术，即位相涨落光外差法和热光束偏转技术进行了比较。在现场测量中，当探头长度为3 cm时，灵敏度达到0.5×10~(-7)cm~(-1)。
A novel laser intracavity photothermal detector is described. In this scheme, sample absorption of the pump laser power takes place within the cavity of a probe He-Ne laser causing modulation in the gain and in turn the output power. Comparison of this intracavity detector with two other photothermal techniques, namely, phase fluctuation optical heterodyne spectroscopy and thermal beam deflection, is made in terms of practicality and sensitivity. For in situ measurements, sensitivity of 0.5 x 10(-7) cm(-1) for a probe length of 3 cm has been achieved.