Thermodynamic and noise considerations for the detection of microscopic particles in a gas by photoacoustic Raman spectroscopy
Thermodynamic and noise considerations for the detection of microscopic particles in a gas by photoacoustic Raman spectroscopy
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DOI：
10.1016/j.optcom.2004.11.036
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发表时间：
2005-02-15
影响因子：
2.4
通讯作者：
Scully, MO
中科院分区：
文献类型：
--
作者：
Das, KK;Rostovtsev, YV;Scully, MO
我们建立了一个简单的热力学模型来描述气体中悬浮微粒的热传递机制和光声拉曼光谱中声波的产生。利用Langevin方法描述热噪声，研究了热噪声的信号和噪声特性，并由噪声等效功率确定了悬浮颗粒的最小可探测数密度。我们发现，对于一些相关的情况下，只有100个粒子每立方米可以检测到。(C)2004 Elsevier B.V.保留所有权利。
We develop a simple thermodynamic model to describe the heat transfer mechanisms and generation of acoustic waves in photoacoustic Raman spectroscopy by small particulate suspensions in a gas. Using Langevin methods to describe the thermal noise we study the signal and noise properties, and from the noise equivalent power we determine the minimum number density of the suspended particles that can be detected. We find that for some relevant cases, as few as 100 particles per cubic meter can be detected. (C) 2004 Elsevier B.V. All rights reserved.