Cao Yuan, Tian Xing, Cheng Gang, Liu Kun, Wang Gui-Shi, Zhu Gong-Dong, Gao Xiao-Ming. NO2 measurement using fiber coupled broadband LED source combining a Herriott multi-pass cellJ. Acta Physica Sinica, 2019, 68(16): 164201. DOI: 10.7498/aps.68.20190243