This work was supported by the National Natural Science Foundation of China (60977058 & 61475085), the Science and Technology Development Project of Shandong Province (2014GGX101007), and the Fundamental Research Funds of Shandong University (2014YQ011).
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 ...