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首页> 外文期刊>Applied physics. B, Lasers and optics >Formaldehyde sensor using interband cascade laser based quartz-enhanced photoacoustic spectroscopy
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Formaldehyde sensor using interband cascade laser based quartz-enhanced photoacoustic spectroscopy

机译:基于带间级联激光的石英增强光声光谱法甲醛传感器

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摘要

A novel continuous-wave mid-infrared distributed feedback interband cascade laser was utilized to detect and quantify formaldehyde (H_2CO) using quartz-enhanced photoacoustic spectroscopy. The laser was operated at liquid-nitrogen temperatures and provided single-mode output powers of up to 12 mW at 3.53 μm (2832.5 cm~(-1)). The noise equivalent (1σ) detection sensitivity of the sensor was measured to be 2.2 x 10~(-8) cm~(-1) W (Hz)~(-1/2) for H_2CO in ambient air, which corresponds to a detection limit of 0.6 parts in 10~6 by volume (ppmv) for a 10 s sensor time constant and 3.4 mW laser power delivered to the sensor module.
机译:利用一种新型的连续波中红外分布反馈带间级联激光器,利用石英增强的光声光谱技术检测和定量甲醛(H_2CO)。该激光器在液氮温度下工作,在3.53μm(2832.5 cm〜(-1))处提供高达12 mW的单模输出功率。传感器的噪声当量(1σ)检测灵敏度经测量为环境空气中H_2CO的2.2 x 10〜(-8)cm〜(-1)W(Hz)〜(-1/2),对应于对于10 s的传感器时间常数和向传感器模块提供3.4 mW的激光功率,检测极限为10〜6体积(ppmv)中的0.6份。

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