Chinese Optics Letters, 2015, 13 (11): 111201, Published Online: Sep. 13, 2018
Hollow-waveguide-based carbon dioxide sensor for capnography Download: 1073次
120.3890 Medical optics instrumentation 300.6260 Spectroscopy, diode lasers 280.1415 Biological sensing and sensors
Abstract
A CO 2 sensor for capnography, based on a hollow waveguide (HWG) and tunable diode laser absorption spectroscopy (TDLAS), is presented; the sensor uses direct absorption spectroscopy and requires neither frequent calibration nor optical filters, giving it a significant advantage over existing techniques. Because of the HWG, the CO 2 measurement achieved a concentration resolution of 60 ppm at a measurement rate of 25 Hz, as characterized by Allan variance. The length of the HWG was selected to efficiently suppress the optical fringes. This setup is perfectly suited for the detection of CO 2 by capnography, and shows promise for the potential detection of other breath gases.
Bo Xiong, Zhenhui Du, Lin Liu, Zheyuan Zhang, Jinyi Li, Qiling Cai. Hollow-waveguide-based carbon dioxide sensor for capnography[J]. Chinese Optics Letters, 2015, 13(11): 111201.