articlePhotoacousticsFeb 11, 2025GOLD OA

Highly sensitive H2S-LITES sensor with 80 m fiber-coupled multi-pass cell based on optical path multiplexing technology

HSHaiyue SunYHYing HeSQShunda QiaoCZChu ZhangYMYufei Ma

Harbin Institute of Technology

PubMed
Indexed incrossrefdoajpubmed

Abstract

This paper presented a highly sensitive light-induced thermoelastic spectroscopy (LITES) sensor for detecting hydrogen sulfide (H₂S) gas. Optical path multiplexing (OPM) technology was implemented within the fiber-coupled multi-pass cell (MPC) to realize ~ 80 m gas absorption optical path length (OPL), compensating the weak absorption coefficient of H 2 S in the near-infrared band. A circle-head quartz tuning fork (QTF) with resonant frequency of ~ 9.5 kHz was adopted in the H₂S-LITES sensor to enhance the energy accumulation time and the detection ability. Compared with commercial QTF, signal-to-noise ratio (SNR) based on circle-head QTF was improved by a factor of 3.36 times. Minimum detection limit (MDL)…

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Topics & keywords

Topics
Keywords
  • Multiplexing
  • Optical fiber
  • Optoelectronics
  • Path (computing)
  • Materials science
  • Electronic engineering
  • Telecommunications
  • Computer science
UN Sustainable Development Goals
  • Affordable and clean energy
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