立方腔平均反射光程的研究

利用有限元光腔表面分割法对立方腔的平均反射光程(Average Reflex Optical Path Length, Lave)进行了数值模拟, 给出了Lave与腔长的线性关系式, 并通过TDLAS实验得到了具有不同腔长的立方腔Lave的实验值。研究结果表明, 立方腔的Lave随着腔长的增加而线性增大。与之前报道的理论结果相比, 采用有限元光腔表面分割法得到的Lave模拟值与实验值更为接近, 误差率仅在2.5%以内。立方腔平均反射光程模拟值与腔长的关系可以作为确定腔长的依据, 提高了基于立方腔的TDLAS气体测量系统的反演精度。

Abstract

A new method of the finite element cavity surface segmentation was presented to simulate the propagation of light in the cubic cavity, and the linear formula between the average reflex optical path length(Lave) and cavity length of closed cubic cavity was calculated with MATLAB. At the same time, the Lave of cubic cavities with different cavity lengths were obtained by Tunable Diode Lave Absorption Spectroscopy(TDLAS) technique. Results show that the Lave will increase linearly with the increase of cavity length. Compared with the previous theoretical values, the experimental values have a better agreement with the simulated values of the finite element cavity surface segmentation and the relative errors between simulated values are no more than 2.5%. The linear formula between the Lave and cavity length can be used to decide the cavity length and enhances the inversion accuracy of TDLAS gas measurement system based on cubic cavity.

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刘高佑, 安宁, 韩兴伟, 董雪, 马磊, 范存波, 刘承志. 立方腔平均反射光程的研究[J]. 红外与激光工程, 2016, 45(11): 1118003. Liu Gaoyou, An Ning, Han Xingwei, Dong Xue, Ma Lei, Fan Cunbo, Liu Chengzhi. Study on average reflex optical path length of cubic cavity[J]. Infrared and Laser Engineering, 2016, 45(11): 1118003.

立方腔平均反射光程的研究

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