Triple-range adjustable plane-concave multipass gas cell for high-precision trace gas detection based on TDLAS

Hu, Zhen; Shi, Yongpeng; Niu, Mingsheng; Li, Taohua; Li, Hui; Liu, Huiyuan

doi:10.1016/j.optlaseng.2024.108023

Cited by 5 publications

(1 citation statement)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The R3 triplet of the 2

band at

6046.95

was selected, which is the most commonly used in NIR methane detection [ 40 – 42 ]. A distributed feedback laser (NLK1U5FAAA, NEL) emitting at 1653 nm was used as the laser source to target the selected line.…”

Section: Design Of the Exhaled Breath Sensormentioning

confidence: 99%

Real-time breath gas analysis of methane using a multipass cell-based near-infrared gas sensor

Kong,

Huang,

Liu

et al. 2024

Biomed. Opt. Express

View full text Add to dashboard Cite

We demonstrated a near-infrared exhaled breath sensor for real-time methane measurements by using tunable diode laser absorption spectroscopy (TDLAS), which can enable the noninvasive diagnosis of intestinal tract problems. The core component of the near-infrared TDLAS sensor is a two-mirror-based multipass cell with nine-circle patterns. An optical path length of 23.4 m was achieved in a volume of 233.3 cm3, which effectively improved the detection sensitivity and shortened the gas exchange time. The minimum detection limit was 0.37 ppm by applying wavelength modulation spectroscopy, which was 12.4 times greater than that of direct absorption spectroscopy. In addition, combined with wavelength modulation spectroscopy, the two-mirror-based multipass cell enabled sub-second gas exchange time of 0.6 s. Methane breath experiments were conducted with six volunteers, and the real-time measurement results and concentrations at the end of exhalation were analyzed. This study demonstrates that the developed sensor has high sensitivity, high selectivity, and fast response for breath methane measurements and has promising potential for noninvasive, real-time, and point-of-care disease diagnosis in clinical applications.

show abstract

“…The R3 triplet of the 2

band at

6046.95

Section: Design Of the Exhaled Breath Sensormentioning

confidence: 99%