| Literature DB >> 31956488 |
Huadan Zheng1,2,3, Yihua Liu2, Haoyang Lin2, Bin Liu4, Xiaohang Gu2, Dongquan Li2, Bincheng Huang2, Yichao Wu5, Linpeng Dong1,2, Wenguo Zhu1,2, Jieyuan Tang1, Heyuan Guan1, Huihui Lu1, Yongchun Zhong1, Junbin Fang3, Yunhan Luo1, Jun Zhang1, Jianhui Yu1,2,3, Zhe Chen1,2,3, Frank K Tittel6.
Abstract
Pilot line manufactured custom quartz tuning forks (QTFs) with a resonance frequency of 28 kHz and a Q value of >30, 000 in a vacuum and ∼ 7500 in the air, were designed and produced for trace gas sensing based on quartz enhanced photoacoustic spectroscopy (QEPAS). The pilot line was able to produce hundreds of low-frequency custom QTFs with small frequency shift < 10 ppm, benefiting the detecting of molecules with slow vibrational-translational (V-T) relaxation rates. An Au film with a thickness of 600 nm were deposited on both sides of QTF to enhance the piezoelectric charge collection efficiency and reduce the environmental electromagnetic noise. The laser focus position and modulation depth were optimized. With an integration time of 84 s, a normalized noise equivalent absorption (NNEA) coefficient of 1.7 × 10-8 cm-1∙W∙Hz-1/2 was achieved which is ∼10 times higher than a commercially available QTF with a resonance frequency of 32 kHz.Entities:
Keywords: Gas sensing; Photoacoustic detection; Photoacoustic spectroscopy; Quartz tuning fork
Year: 2019 PMID： 31956488 PMCID： PMC6961718 DOI： 10.1016/j.pacs.2019.100158
Source DB: PubMed Journal: Photoacoustics ISSN： 2213-5979