NO $_2$的中红外脉冲光参量振荡光声光谱研究
Photoacoustic spectroscopy of NO$_2$ using a mid-infrared pulsed optical parametric oscillator as light source
摘要：
本文介绍了一种光声（PA）传感器，用于常温常压下NO $_2$ -N $_2$的光谱测量。PA传感器由纳秒脉冲单模中红外（MIR）光学参量振荡器（OPO）谐振泵浦。在3.25 $μ$ m至3.55 $μ$ m波长范围内，以5 cm $^{-1}$的分辨率带宽和1.6 ppmV（$μ$ mol/mol）的Single Shot检测限对NO $_2$ -N $_2$进行光谱测量。以300 ml/min的恒定流速进行测量，从而证明了气体传感器用于实时痕量气体测量的适用性。将获得的光谱与Hitran数据库中的数据进行比较，发现具有良好的一致性。Allan偏差分析表明，PAS传感器在最佳积分时间的检测限为14 ppbV（nmol/mol），积分时间为170秒，对应于归一化噪声等效吸收（NNEA）系数为3.3 $\times 10^{-7}$ W cm $^{-1}$ Hz $^{-1/2}$。
英文摘要：
A photoacoustic (PA) sensor for spectroscopic measurements of NO$_2$-N$_2$ at ambient pressure and temperature is demonstrated. The PA sensor is pumped resonantly by a nanosecond pulsed single-mode mid-infrared (MIR) optical parametric oscillator (OPO). Spectroscopic measurements of NO$_2$-N$_2$ in the 3.25 $μ$m to 3.55 $μ$m wavelength region with a resolution bandwidth of 5 cm$^{-1}$ and with a single shot detection limit of 1.6 ppmV ($μ$mol/mol) is demonstrated. The measurements were conducted with a constant flow rate of 300 ml/min, thus demonstrating the suitability of the gas sensor for real time trace gas measurements. The acquired spectra is compared with data from the Hitran database and good agreement is found. An Allan deviation analysis shows that the detection limit at optimum integration time for the PAS sensor is 14 ppbV (nmol/mol) at 170 seconds of integration time, corresponding to a normalized noise equivalent absorption (NNEA) coefficient of 3.3$\times 10^{-7}$ W cm$^{-1}$ Hz$^{-1/2}$.
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