用于沼气厂的 LED 吸收-QEPAS 传感器。

LED-Absorption-QEPAS Sensor for Biogas Plants.

机构信息

Fraunhofer Heinrich Hertz Institute.

Clausthal University of Technology, IEPT, Am Stollen 19B, Goslar 38640, Germany.

出版信息

Sensors (Basel). 2015 May 22;15(5):12092-102. doi: 10.3390/s150512092.

DOI:10.3390/s150512092

PMID:26007746

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4481913/

Abstract

A new sensor for methane and carbon dioxide concentration measurements in biogas plants is presented. LEDs in the mid infrared spectral region are implemented as low cost light source. The combination of quartz-enhanced photoacoustic spectroscopy with an absorption path leads to a sensor setup suitable for the harsh application environment. The sensor system contains an electronics unit and the two gas sensors; it was designed to work as standalone device and was tested in a biogas plant for several weeks. Gas concentration dependent measurements show a precision better than 1% in a range between 40% and 60% target gas concentration for both sensors. Concentration dependent measurements with different background gases show a considerable decrease in cross sensitivity against the major components of biogas in direct comparison to common absorption based sensors.

摘要

本文提出了一种用于沼气装置中甲烷和二氧化碳浓度测量的新型传感器。中红外光谱区域的 LED 被用作低成本光源。将石英增强光声光谱学与吸收路径相结合，得到了一种适用于恶劣应用环境的传感器设置。该传感器系统包含一个电子单元和两个气体传感器；它被设计为独立的设备，并在沼气厂进行了数周的测试。在两个传感器的测量范围内，气体浓度相关测量的精度均优于 1%，目标气体浓度在 40%至 60%之间。与常见的基于吸收的传感器相比，针对不同背景气体的浓度相关测量显示出对沼气主要成分的交叉灵敏度有相当大的降低。