中文摘要：

基于的湿度表与一个 long-path-length Herriot 煤气的房间和无水的光部件相结合的分布式的反馈二极管激光(DFB-DL ) 被建议并且调查。这个传感器的主要函数是同时改进测量可靠性和分辨率。在一个 10 厘米的正常传播类型气体房间和一个 3-m Herriot 煤气的房间之间的比较测试被执行表明改进。可靠性改进被水蒸汽的影响抑制通过 Herriot 煤气的房间和无水的光部件的联合行动在光部件(WVOC ) 内完成。WVOC 的影响用 Herriot 煤气的房间从 726 ppmv 被压制到 25 ppmv。而且，与无水的光部件结合了， WVOC 的影响进一步被压制到仅仅 4 ppmv。到 0.32 ppmv 的从 11.7 ppmv 的决定改进主要由于 long-path-length Herriot 煤气的房间的申请被完成。结果证明建议传感器在煤气的察觉到有好表演和可观的潜在的申请，特别当探查的气体可能渗入进光部件时。

英文摘要：

A distributed feedback diode laser （DFB-DL） based hygrometer combined with a long-path-length Herriot gas cell and waterless optical components was proposed and investigated. The main function of this sensor was to simultaneously improve the measurement reliability and resolution. A comparison test between a 10-cm normal transmission-type gas cell and a 3-m Herriot gas cell was carried out to demonstrate the improvement. Reliability improvement was achieved by influence suppression of water vapor inside optical components （WVOC） through combined action of the Herriot gas cell and waterless optical components. The influence of WVOC was suppressed from 726ppmv to 25ppmv using the Herriot gas cell. Moreover, combined with waterless optical components, the influence of WVOC was further suppressed to no more than 4ppmv. Resolution improvement from l l.7ppmv to 0.32ppmv was achieved mainly due to the application of the long-path-length Herriot gas cell. The results show that the proposed sensor has a good performance and considerable potential application in gas sensing, especially when probed gas possibly permeates into optical components.