This paper presented a new non-contact method to meter CO concentration and smoke optical density simultaneously and online based on photoacoustic technology.
本文提出一种利用光声技术同时在线测量CO浓度和烟雾消光的非接触式方法。
Low level CO measuring with photoacoustic and infrared absorption spectrometry may help analysis of combustion process, toxicity and early fire detection.
但常用的光声仪器的现场性、实时性较差 ,一般红外吸收法又不如前者灵敏。
The requirements and principles of using photoacoustic gas detection technique in fire detection area are discussed and an unusual photoacoustic gas detection system is presented.
将可检测极低浓度的某一气体的光声检测技术应用于极早期火灾气体产物的检测是一个新的尝试 ,将可能实现高灵敏度、高可靠性的火灾探测。
In photoacoustics measurements the gas pressure variation around the sample, which is caused by temperature variation in the sample surface due to absorption of light radiation, is detected.
光声 (光热 )效应是由于物质吸收一强度随时间变化的光束而被时变加热时所引起的一系列热效应和声效应 。
Study of the Photoacoustic Spectroscopy on the Phosphatizing of the Surface of Steel;
钢铁表面磷化过程的光声光谱研究
Sensitive wavelength-modulated photoacoustic spectroscopy with DFB diode laser;
灵敏的基于分布反馈式半导体激光波长调制光声光谱(英文)
Design of photoacoustic cell is a key factor affecting the measurement results.
光声技术探测火灾具有很大的优势,而光声腔的设计则是影响其测量结果最为关键的环节之一。
A method of using correlation photoacoustic technique to measure thermal diffusivity of material was presented, and the diffusivity of nanometer SnO_2 was measured at different pressure and annealing temperature.
提出了利用相关光声技术测量材料热扩散率的方法,利用该方法对不同退火温度和成型压力下的纳米SnO2的热扩散率进行了测量。
The phase transition temperature of thin film was studied by piezoelectric photoacoustic technique according to the sudden change of photoacoustic signal.
对钛酸铅薄膜的相变温度进行了研究 ,首先采用压电光声技术对钛酸铅薄膜相变温度进行了测量 ,根据材料在相变点上光声信号发生突变的特点 ,测量出钛酸铅薄膜的相变温度是 470℃ ;并通过改变光束调制频率 ,测量了同一组成不同厚度的钛酸铅薄膜的相变温度 ,结果发现随着膜厚度的增加 ,相变温度随之升高 ;同时又测量了同一薄膜内不同层上钛酸铅的相变温度 ,结果是从衬底向薄膜表面方向 ,相变温度逐渐降低 。
Detection of NO_2 molecule with photoacoustic technique;
NO2是大气污染物的主要成分之一,该污染物在430～450nm波长范围内有很强的吸收,用在400-450 nm波长范围内具有较强荧光发射的常用脉冲闪光灯作激发光源,采用光声技术,用自行设计制作的一套光声探测装置,对常温条件下NO2分子在430～450nm波长区间的光声特性进行了实验研究。