小型光声池用于高灵敏度laser检测气体介质中的氨

用于油中现场检测的小型光声光谱气体探头

Miniaturized Photoacoustic Spectroscopy Gas Probe for In-Situ Detection in Oil

设计开发小型光声光谱气体探头用于油浸电力设备现场检测。采用单腔单光纤结构，经模型分析揭示增强机制，制备出传感器原型，测试表明其性能良好，为变压器油中溶解气体原位监测提供技术方案。

用于气体传感的小型化香蕉型谐振光声池样机

A Miniaturized Prototype of Resonant Banana-Shaped Photoacoustic Cell for Gas Sensing

介绍了一种用于激光光谱气体传感的谐振光声池。这个细胞是以前开发的大规模香蕉形细胞的微型模仿。选择指定空腔形状的参数，以便不仅在选定的声共振下提供最佳的单元操作，而且基本上减小单元尺寸。制作了一种适用于近红外窄衍射极限光束的小型化原型单元（声腔体积约为5 mm^3），并进行了实验研究。噪声相关的测量误差和激光引发的信号作为调制频率的函数进行了研究。利用振荡波长为1.53 μ m的尾纤DFB激光二极管测量了氨气在氮气流中的吸收，分析了背景信号和气体对光吸收的有用响应。在第二纵向声共振（共振频率~ 32.9 kHz，Q因子~ 16.3）的原型操作的性能进行了估计。标准化为激光束功率和检测带宽的噪声限制的最小可检测吸收为~ 8.07*10^（-8）cm^（-1）W Hz^（-1/2）。背景信号的振幅相当于约2.5*10^（-5）cm^（-1）的吸收系数。讨论了电池原型的优点和缺点。尽管低吸收传感性能，生产的小型化电池原型显示出良好的气体泄漏检测能力。

Dual-comb photoacoustic spectroscopy with electro-optic generation for the analysis of gaseous samples

In this work we present the design and characterization of a dual comb photoacoustic spectroscopy (DCPAS) set-up for ammonia detection in the near infrared. The system consists of a dual electro-optic (EO) comb generator that generates a multiheterodyne beating signal in the gas sample. The input to the dual EO comb generator is a laser diode tuned to a fixed wavelength within an absorption feature of ammonia (around 1531.6 nm, 6529 cm-1) and we show how the dual comb allows to perform PAS measurements and resolve the absorption features with high spectral resolution. We present results of the…

一种用于气体传感的小型低窗背景谐振型光声池

A compact resonant Π-shaped photoacoustic cell with low window background for gas sensing

本文介绍了一种能在振幅调制状态下检测痕量气体的共振光声池。该单元被设计成使得在选定的声学共振下用于单元操作的窗口背景最小化。制作了一个适用于近红外窄衍射极限光束的紧凑型原型细胞（声腔体积约为0.2 cm^3，总细胞重量为3.5 g），并进行了实验研究。噪声相关的测量误差和激光引发的信号作为调制频率的函数进行了研究。利用工作在1.53 μ m波长附近的尾纤DFB激光二极管测量了氮气流中痕量氨的吸收，分析了背景信号和气体对光吸收的有用响应。估计了在第二纵向声谐振（谐振频率为~ 4.38 kHz，Q因子为~ 13.9）下操作的原型的吸收检测和气体泄漏传感的性能。归一化到激光束功率和探测带宽的噪声等效吸收为~ 1.44 × 10 ^{-9} cm^{-1} W Hz^{-1/2}。窗口背景信号的振幅相当于约2.82 x10 ^{-7} cm^{-1}的吸收系数。

Versatile photoacoustic spectrometer based on a mid-infrared pulsed optical parametric oscillator

We demonstrate the usefulness of a nanosecond pulsed single-mode mid-infrared (MIR) optical parametric oscillator (OPO) for Photoacoustic (PA) spectroscopic measurements. The maximum wavelength ranges for the signal and idler are 1.4 um to 1.7 um and 2.8 um to 4.6 um, respectively, and with a MIR output power of up to 500 mW. Making the OPO useful for different spectroscopic PA trace-gas measurements targeting the major market opportunity of environmental monitoring and breath gas analysis. We perform spectroscopic measurements of methane (CH4) nitrogen dioxide (NO2) and ammonia (NH3) in the 2…

用于原位微尺度痕量气体传感的MEMS光纤尖端光声光谱仪

MEMS Fiber-Tip Photoacoustic Spectrometer for In Situ Microscale Trace Gas Sensing

为满足受限场景下痕量气体传感需求，研制MEMS集成光纤尖端光声光谱仪，采用特定结构，含光声传感器等，实现痕量气体检测，兼具多种优势，克服传统局限。