| TDLAS二次谐波信号检测下限计算方法的研究 |
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| 引用本文： | 蔡彦,吴尚谦,伍昂,翟维,董跃辉.TDLAS二次谐波信号检测下限计算方法的研究[J].科学技术与工程,2011(35). |
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| 作者姓名： | 蔡彦 吴尚谦 伍昂 翟维 董跃辉 |
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| 作者单位： | 昆明理工大学,昆明理工大学,昆明理工大学,昆明理工大学,昆明理工大学 |
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| 摘 要： |
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| 关 键 词： | TDLAS 激光吸收光谱 波长调制 检测下限 信噪比 |
Study on TDLAS second harmonic detection limit calculation method |
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| caiyan,Wu shangqian,Wu ang,Zhai wei and Dong yuehui.Study on TDLAS second harmonic detection limit calculation method[J].Science Technology and Engineering,2011(35). |
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| Authors: | caiyan Wu shangqian Wu ang Zhai wei and Dong yuehui |
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| Affiliation: | Kunming University of Science and Technology,Kunming University of Science and Technology,Kunming University of Science and Technology,Kunming University of Science and Technology |
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| Abstract: | Atmospheric trace gas detection method based on tunable diode laser absorption spectroscopy (TDLAS) has high sensitivity and real-time response characteristics. According to the characteristics of semiconductor lasers, amplitude modulation and residual amplitude modulation noise can also occur when the wavelength is modulated directly and the impact can not be ignored in the case of larger absorption linewidth. In order to investigate the impact of residual amplitude modulation to SNR and detection limit, a second harmonic signal analysis and extraction method is introduced with taking into account simultaneously the wavelength and amplitude modulation. The difference between peak and valley of second harmonic signal are utilized for the system detection signal to calculate the SNR and detection limit. The results show that residual amplitude modulation noise is an important factor to affect the detection limit. |
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| Keywords: | TDLAS Laser Absorption Spectroscopy Wavelength Modulation Detection Limit SNR |
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