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Ammonia detection by use of quartz-enhanced photoacoustic spectroscopy with a near-IR telecommunication diode laser

机译：通过使用石英增强的光声光谱技术和近红外电信二极管激光器进行氨气检测

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摘要

A gas sensor based on quartz-enhanced photoacoustic detection and a fiber-coupled telecommunication distributed-feedback diode laser was designed and characterized for trace NH_(3) monitoring at a 1.53-μm wavelength (overtone absorption region). Signal and noise dependence on gas pressure were studied to optimize sensor performance. The ammonia concentration resulting in a noise-equivalent signal was found to be 0.65 parts per million by volume with 38-mW optical excitation power and a lock-in amplifier time constant of 1 s. This corresponds to a normalized absorption sensitivity of 7.2×10~(-9) cm~(-1) W/Hz~(1/2), comparable with detection sensitivity achieved in conventional photoacoustic spectroscopy. The sensor architecture can be the basis for a portable gas analyzer.
机译：设计了一种基于石英增强的光声检测和光纤耦合的电信分布式反馈二极管激光器的气体传感器，并对其特性进行了表征，以监测1.53μm波长（泛音吸收区）中的痕量NH_（3）。研究了信号和噪声对气压的依赖性，以优化传感器性能。发现产生等效于噪声的信号的氨浓度为百万分之0.65体积，具有38 mW的光激发功率和1 s的锁定放大器时间常数。这对应于7.2×10〜（-9）cm〜（-1）W / Hz〜（1/2）的归一化吸收灵敏度，可与常规光声光谱法中的检测灵敏度相媲美。传感器架构可以成为便携式气体分析仪的基础。

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