光学学报, 2019, 39 (8): 0830001, 网络出版: 2019-08-07
基于波数漂移修正算法的免标定固定点波长调制技术 下载: 973次
Research on Calibration-Free Fixed-Point Wavelength Modulation Spectroscopy Based on Wavenumber Drift-Correction Algorithm
光谱学 固定点波长调制 免标定测量 出光中心波数漂移 漂移修正算法 spectroscopy fixed-point wavelength modulation calibration-free measurement wavenumber drift of output laser center drift-correction algorithm
摘要
分布反馈式激光器在长期运行过程中存在出光中心波数漂移的问题,导致固定点波长调制技术测量气体浓度不准确。为解决该问题,提出了一种基于波数漂移修正算法的免标定固定点波长调制方法,实现了气体浓度的免标定测量。选择中心波数在4958.9674 cm
-1处的吸收谱线测量CO2气体的浓度,以验证该方法的有效性。实验结果表明:修正算法克服了出光中心波数漂移对测量带来的不良影响,有效提高了气体浓度测量的准确性。
Abstract
In the long-term operation of distributed feedback laser, there exists a problem of wavenumber drift of the output laser center; this affects the measurement accuracy of gas concentration by fixed-point wavelength modulation spectroscopy. In order to solve this problem, a calibration-free fixed-point wavelength modulation spectroscopy based on the wavenumber drift-correction algorithm is proposed for the calibration-free measurement of gas concentration. The absorption spectrum at 4958.97 cm
-1 is selected to measure the concentration of CO2 gas for validating the accuracy of this method. The experimental results show that the proposed correction algorithm overcomes the adverse effect of wavenumber drift of the output laser center on the measurement, and effectively improves the accuracy of gas-concentration measurement.
祝仰坤, 周宾, 王一红, 连久翔, 王汗青, 陈慈伟. 基于波数漂移修正算法的免标定固定点波长调制技术[J]. 光学学报, 2019, 39(8): 0830001. Yangkun Zhu, Bin Zhou, Yihong Wang, Jiuxiang Lian, Hanqing Wang, Ciwei Chen. Research on Calibration-Free Fixed-Point Wavelength Modulation Spectroscopy Based on Wavenumber Drift-Correction Algorithm[J]. Acta Optica Sinica, 2019, 39(8): 0830001.