TY - JOUR
T1 - High-resolution trace gas detection by sub-Doppler noise-immune cavity-enhanced optical heterodyne molecular spectrometry
T2 - Application to detection of acetylene in human breath
AU - Zhao, Gang
AU - Hausmaninger, Thomas
AU - Schmidt, Florian M.
AU - Ma, Weiguang
AU - Axner, Ove
N1 - Funding Information:
Swedish Research Council (Vetenskapsrådet, VR: OA: 2015-04374; FMS: 2013-6031); Kempe Foundations (Kempestiftelserna, OA: JCK-1317; FMS: SMK-1446); National Natural Science Foundation of China, International Cooperation and Exchange Programme (61675122).
PY - 2019/1/1
Y1 - 2019/1/1
N2 - A sensitive high-resolution sub-Doppler detecting spectrometer, based on noise-immune cavity-enhanced optical heterodyne molecular spectrometry (NICE-OHMS), for trace gas detection of species whose transitions have severe spectral overlap with abundant concomitant species is presented. It is designed around a NICE-OHMS instrumentation utilizing balanced detection that provides shot-noise limited Doppler-broadened (Db) detection. By synchronous dithering the positions of the two cavity mirrors, the effect of residual etalons between the cavity and other surfaces in the system could be reduced. An Allan deviation of the absorption coefficient of 2.2 × 10−13 cm−1 at 60 s, which, for the targeted transition in C2H2, corresponds to a 3σ detection sensitivity of 130 ppt, is demonstrated. It is shown that despite significant spectral interference from CO2 at the targeted transition, which precludes Db detection of C2H2, acetylene could be detected in exhaled breath of healthy smokers.
AB - A sensitive high-resolution sub-Doppler detecting spectrometer, based on noise-immune cavity-enhanced optical heterodyne molecular spectrometry (NICE-OHMS), for trace gas detection of species whose transitions have severe spectral overlap with abundant concomitant species is presented. It is designed around a NICE-OHMS instrumentation utilizing balanced detection that provides shot-noise limited Doppler-broadened (Db) detection. By synchronous dithering the positions of the two cavity mirrors, the effect of residual etalons between the cavity and other surfaces in the system could be reduced. An Allan deviation of the absorption coefficient of 2.2 × 10−13 cm−1 at 60 s, which, for the targeted transition in C2H2, corresponds to a 3σ detection sensitivity of 130 ppt, is demonstrated. It is shown that despite significant spectral interference from CO2 at the targeted transition, which precludes Db detection of C2H2, acetylene could be detected in exhaled breath of healthy smokers.
UR - http://www.scopus.com/inward/record.url?scp=85068037731&partnerID=8YFLogxK
U2 - 10.1364/OE.27.017940
DO - 10.1364/OE.27.017940
M3 - Article
AN - SCOPUS:85068037731
SN - 1094-4087
VL - 27
SP - 17940
EP - 17953
JO - Optics Express
JF - Optics Express
IS - 13
ER -