Measurement of Ethylene Concentrations at High Pressure Based on Tunable Diode Laser Absorption Spectroscopy near 1620 nm

Zhang, T.; Zhang, G.; Liu, Xiaoyu; Gao, Guangzhen; Cai, Tong

doi:10.1007/s10812-020-01053-8

Cited by 6 publications

(1 citation statement)

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“…Some examples of O 2 concentration measurement using TDLAS include the following. In 2009, Zhang S A et al used a DFB laser as a light source to detect O 2 with an absorption line near 760 nm by TDLAS combined with wavelength modulation spectroscopy (TDLAS-WMS), realizing a detection accuracy of 1000 ppmv [15]. In 2017, an O 2 sensor system was proposed by Zhou X et al with a cubic diffusion integral cavity as the gas absorption cell to increase the absorption optical path length, and a detection limit of 350 ppmv was achieved by the measurement of O 2 absorption line at 764.38 nm [16].…”

Section: Introductionmentioning

confidence: 99%

Development of a Stable Oxygen Sensor Using a 761 nm DFB Laser and Multi-Pass Absorption Spectroscopy for Field Measurements

Chang

2023

Sensors

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An optical sensor system based on wavelength modulation spectroscopy (WMS) was developed for atmospheric oxygen (O2) detection. A distributed feedback (DFB) laser with butterfly packaging was used to target the O2 absorption line at 760.89 nm. A compact multi-pass gas cell was employed to increase the effective absorption length to 3.3 m. To ensure the stability and anti-interference capability of the sensor in field measurements, the optical module was fabricated with isolation of ambient light and vibration design. A 1f normalized 2f WMS (WMS-2f/1f) technique was adopted to reduce the effect of laser power drift. In addition, a LabVIEW-based dual-channel lock-in amplifier was developed for harmonic detection, which significantly reduced the sensor volume and cost. The detailed detection principle was described, and a theoretical model was established to verify the effectiveness of the technique. Experiments were carried out to obtain the device’s sensing performances. An Allan deviation analysis yielded a minimum detection limit of 0.054% for 1 s integration time that can be further improved to 0.009% at ~60 s. Finally, the reliability and anti-interference capability of the sensor system were verified by the atmospheric O2 monitoring.

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Section: Introductionmentioning

confidence: 99%