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High-sensitivity ethylene gas sensor based on NDIR and dual-channel lock-in amplifier
Optik ( IF 3.1 ) Pub Date : 2020-09-16 , DOI: 10.1016/j.ijleo.2020.165630
Yunbo Zhang , Pai Jiang , Weijie Cao , Xiaoping Li , Jianjun Lai

Ethylene(C2H4) is a gas hormone released when plants mature, and can be used as a fruit ripe catalyst or preservative at appropriate concentrations. Usually, the gas concentration detection in this application requires its sensitivity of several ppm or even sub-ppm level. In order to meet this application requirement, a highly sensitive non-dispersive-infrared (NDIR) ethylene gas sensor was developed based on components including an electrically modulated MEMS infrared light source and a dual-wavelength thermal infrared detector, combined with a high-efficiency gas cell with reflected light path structure as well as a lock-in amplifier circuit. The simulated light power collection efficiency for gas cell has reached 92% and the signal-to-noise ratio of the infrared detection circuit has attained 52 dB. Experimentally, after using a dual temperature compensation method, the relative error of the sensor in the concentration range of 1 ∼ 100 ppm would not exceed 10%, the detection stability was around 1 ppm, and the detection limit was close to 1 ppm, which was potentially applied to the fields such as fruit maturity detection.



中文翻译:

基于NDIR和双通道锁定放大器的高灵敏度乙烯气体传感器

乙烯(C 2 H 4)是植物成熟后释放的一种气体激素,可以用作水果成熟的催化剂或适当浓度的防腐剂。通常,此应用中的气体浓度检测需要几ppm甚至亚ppm级别的灵敏度。为了满足此应用需求,基于包括电调制MEMS红外光源和双波长热红外探测器在内的组件,结合高效率,开发了一种高灵敏度的非分散红外(NDIR)乙烯气体传感器。具有反射光路结构的气室以及锁定放大器电路。气室的模拟光功率收集效率已达到92%,红外检测电路的信噪比达到52 dB。实验上,

更新日期:2020-09-16
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