Open AccessUltra-high sensitive light-induced thermoelastic spectroscopy sensor with a high Q-factor quartz tuning fork and a multipass cell
Author(s) -
Yaning He,
Yufei Ma,
Yao Tong,
Xin Yu,
Frank K. Tittel
Publication year - 2019
Publication title -
optics letters/optics index
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.524
H-Index - 272
eISSN - 1071-2763
pISSN - 0146-9592
DOI - 10.1364/ol.44.001904
Subject(s) - photoacoustic spectroscopy , spectroscopy , materials science , time delay and integration , tuning fork , thermoelastic damping , optics , tunable diode laser absorption spectroscopy , absorption spectroscopy , attenuation coefficient , detection limit , absorption (acoustics) , diode , analyte , laser , optoelectronics , analytical chemistry (journal) , tunable laser , chemistry , physics , vibration , acoustics , chromatography , quantum mechanics , thermal , meteorology
An ultra-high sensitive light-induced thermoelastic spectroscopy (LITES) sensor based on a resonant high Q-factor quartz turning fork (QTF) and a Herriot multipass cell was demonstrated for the first time, to the best of our knowledge. The performance of LITES and widely used tunable diode laser absorption spectroscopy (TDLAS) were experimentally investigated and compared at the same conditions. Carbon monoxide (CO) was chosen as the analyte to verify the reported sensors' performance. With a minimum detection limit (MDL) of 470 ppb for 60 ms integration time and a noise equivalent absorption (NEA) coefficient of 2.0×10 -7 cm -1 Hz -1/2 , and a MDL of 17 ppb with an optimum integration time of 800 s, the reported LITES sensor showed a superior sensing capability compared with a TDLAS sensor and a conventional quartz-enhanced photoacoustic spectroscopy (QEPAS) sensor.