摘要
随着清洁能源的推进,天然气(甲烷)在能源消耗中所占比重逐年加大,甲烷的气体检测报警技术已经成为火灾探测中一个重要研究方向。利用近红外吸收光谱检测方法的气体探测技术具有本质安全、稳定性好、选择性好、工作寿命长等独到的优势。提出了基于波长调制和二次谐波(2f)信号探测技术的气体检测系统,模拟了检测系统对一、二次谐波的提取过程,分析了一次谐波做光源强度参考的可行性及二次谐波与浓度的线性关系,为此类技术的产品化提供了理论指导。
With the advances in clean energy, natural gas(methane) takes a greater proportion in total energy consumption. Methane gas detection technology has become an important research direction for fire alarm area. Using near-infrared absorption spectroscopy method, this gas detection technology has many unique advantages, such as intrinsic safe, good stability, good selectivity, long working life, etc.. In this paper, a gas detection system based on wavelength modulation and second harmonic(2f) signal detection technology is proposed; the process of the first and second harmonic demodulation is simulated; the feasibility of using first harmonic as light intensity reference and the linear relationship between the concentration and second harmonic is analyzed. Finally, a theoretical guidance for product developing with above technology is provided as well.
出处
《科技通报》
北大核心
2016年第10期13-16,共4页
Bulletin of Science and Technology
关键词
甲烷
吸收光谱
二次谐波
锁相
methane
absorption spectrum
second harmonic
lock-in
