| 频率-振幅调制相位差对TDLAS 2次谐波线型的影响 |
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| 引用本文： | 翟维,吴尚谦,董跃辉,刘爱英,皇甫张棣. 频率-振幅调制相位差对TDLAS 2次谐波线型的影响[J]. 激光技术, 2013, 37(3): 284-288. DOI: 10.7510/jgjs.issn.1001-3806.2013.03.003 |
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| 作者姓名： | 翟维 吴尚谦 董跃辉 刘爱英 皇甫张棣 |
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| 作者单位： | 1.昆明理工大学理学院, 昆明650500 |
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| 摘 要： | 为了研究频率-振幅调制(FM-AM)间相位差对TDLAS 2次谐波信号及线型的影响,采用考虑残余振幅调制的波长调制光谱技术计算方法,推导出了考虑FM-AM相位差的2次谐波信号的理论计算公式,并模拟计算了FM-AM相位差对谐波信号线型造成的影响。结果表明,2次谐波信号正峰值、左右负峰值、基线值均随FM-AM相位差发生变化,而左右负峰的间距不受其影响,保持不变。该计算结果对TDLAS气体检测有重要的意义。
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| 关 键 词： | 光谱学 可调谐二极管激光吸收光谱 波长调制 线型 相位差 |
| 收稿时间： | 2012-09-12 |
Effect of FM-AM phase difference on the second harmonic line shape of TDLAS |
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| ZHAI Wei , WU Shang-qian , DONG Yue-hui , LIU Ai-ying , HUANGFU Zhang-di. Effect of FM-AM phase difference on the second harmonic line shape of TDLAS[J]. Laser Technology, 2013, 37(3): 284-288. DOI: 10.7510/jgjs.issn.1001-3806.2013.03.003 |
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| Authors: | ZHAI Wei WU Shang-qian DONG Yue-hui LIU Ai-ying HUANGFU Zhang-di |
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| Abstract: | In order to study the effect of phase difference between frequency modulation and amplitude modulation on both the second harmonic signal and its line shape,the mathematical derivations for wavelength modulation spectroscopy were presented in consideration of residual amplitude modulation,and then the theoretical calculation formulas of considering FM-AM phase difference were deduced.In addition,the impact of FM-AM phase difference on harmonic signal line shape was also simulated and calculated.The results show that the second harmonic signal positive peaks and the left and right negative peak as well as the signal baseline are all changed with the FM-AM phase difference.However,the distance between left and right negative peak value is not affected by it,remaining unchanged.The calculation results have important significant on tunable diode laser absorption spectroscopy gas detection. |
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