Optimization design of transmission for on-line VOCs sensing gas cell
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摘要: 为了满足环境监测需求，需要研制一种能够对挥发性有机化合物（VOCs）成分进行在线高灵敏度、高保真监测，并适用于傅里叶变换红外光谱探测配备的气体吸收池，采用光学追迹结合有限元分析的方法，分别对气体池物镜夹持调节机构与光学整体结构固定方式进行优化设计，较为有效地解决了在VOCs监测中气体池工作温度要求下光学器件形变校正的问题，可优化80℃~180℃工作范围内的光能传输效率。给出了一种适用于VOCs气体特定温度条件下吸收池出射能量优化设计的方法，并以此方法为基础，设计加工了一型气体吸收池，进行了热环境测试。结果表明，该吸收池具备在80℃~180℃工作范围内稳定的传输效率，能够应用到VOCs在线监测系统中进行测量。Abstract: In order to meet the needs of environmental monitoring, one gas absorption pool was developed. The gas pool could monitor the composition of volatile organic compounds (VOCs) on-line with high sensitivity and high fidelity, and was suitable for the equipment with Fourier transform infrared spectrum detection device. The method of combination of finite element analysis and optical trace was used to do optimization design of gas pool lens clamping adjustment and the fixed mode of optical whole structure. The problem of distortion correction of optical devices in VOCs monitoring of gas pool was solved effectively. The energy transmission efficiency can be optimized in the working range of 80℃ to 180℃. The method of optimization design of absorption pool output energy, suitable for VOCs gas and at specific temperature, was presented. Based on the method, one type of gas absorption pool was designed and the thermal environment test was carried out. The results show that, the absorption pool has stable transmission efficiency in the working range of 80℃~180℃ and can be applied in on-line VOCs sensing system.
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Figure 5. Relationship between output energy and transmission distance
a—field mirror b—object mirror
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Figure 6. Relationship between output energy and rotation angle
a—field mirror b—object mirror
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Figure 9. Thermal stress distribution of structure
a—before optimization b—after optimization
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