Sensitive absorption measurements in the near-infrared region using off-axis integrated-cavity-output spectroscopy
Sensitive absorption measurements in the near-infrared region using off-axis integrated-cavity-output spectroscopy
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DOI：
10.1007/s00340-002-0971-z
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发表时间：
2002-09-01
影响因子：
2.1
通讯作者：
O'Keefe, A
中科院分区：
文献类型：
--
作者：
Baer, DS;Paul, JB;O'Keefe, A
一种新型的仪器，采用高精细光学腔作为吸收池已开发的气体混合比的灵敏测量使用近在稀有二极管激光器和吸收光谱技术。该仪器采用激光束通过细胞的离轴轨迹，以产生几公里的有效光程长度，而不会由于腔共振而产生显著的不必要的影响。结果表明，在1.1Hz的探测带宽内，在4.2km的有效光程上，最小可探测吸收约为1.4 × 10 ~（-5），探测灵敏度约为3.1 × 10 ~（-11）cm ~（-1）Hz ~（-1/2）。该仪器已用于CO、CH_4、C_2H_2和NH_3的灵敏测量
A novel instrument that employs a high-finesse optical cavity as an absorption cell has been developed for sensitive measurements of gas mixing ratios using near-in rare diode lasers and absorption-spectroscopy techniques. The instrument employs an off-axis trajectory of the laser beam through the cell to yield an effective optical path length of several kilometers without significant unwanted effects due to cavity resonances. As a result, a minimum detectable absorption of approximately 1.4 x 10(-5) over an effective optical path of 4.2km was obtained in a 1.1-Hz detection bandwidth to yield a detection sensitivity of approximately 3.1 x 10(-11) cm(-1) Hz(-1/2). The instrument has been used for sensitive measurements of CO, CH4, C2H2 and NH3