Time-Delay-Domain and Pseudorandom-Noise Photoacoustic and Photothermal Wave Processes: A Review of the State of the Art
Time-Delay-Domain and Pseudorandom-Noise Photoacoustic and Photothermal Wave Processes: A Review of the State of the Art
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时滞域和伪随机噪声光声和光热波过程：现有技术回顾
DOI：
10.1109/t-uffc.1986.26871
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发表时间：
1986
期刊：
影响因子：
--
通讯作者：
A. Mandelis
中科院分区：
文献类型：
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作者：
A. Mandelis
本文评述了相关分析和光谱分析方法在光声和光热波检测中的应用和发展。本文的目的是：1）描述两种最重要的光热相关和光谱处理技术，即伪随机噪声和调频时间延迟（或频率扫描）光学激励; 2）比较这些技术的技术特征，例如测量动态范围特性、所需的测量时间量和仪器要求;（3）介绍了该技术相对于常用的频域法和脉冲激光激发法的优点，并对它们进行了详细的比较。注意力集中在信号产生，处理和解释的概念和数学细节。信号动态范围、脉冲响应和传递函数的细微但显著的差异被证明可以确定两种主要技术中每一种的极限，并且被迄今为止可用的实验证据所证实。对这些技术的光谱和热成像应用的稳步增长的文献的回顾是它们对进行基础和应用研究的承诺的有力指标，主要是由于1）通过伪随机光热激发获得的上级丰富信息，与传统的频率色散技术相比，以及2）与脉冲激光激发相比，伪随机脉冲响应的破坏性较小。
The application and development of correlation and spec- tral analysis methods to photoacoustic and photothermal wave detec- tion are examined. The purposes of this review are to 1) describe the two most prominent techniques available for photothermal correlation and spectral processing, namely the pseudorandom noise and the fre- quency-modulation (FM) time-delay (or frequency sweep) optical ex- citation; 2) compare the technical features of these techniques, such as measurement dynamic range properties, amount of measurement time required and instrumentation requirements; and 3) present advantages of the techniques over the widely used conventional frequency domain and pulsed laser excitation, as well as a detailed comparison between themselves. Attention is focused on the conceptual and mathematical details of signal generation, processing, and interpretation. Subtle but significant differences in the signal dynamic range, impulse response, and transfer function are shown to determine the limits of each of the two major techniques and are corroborated by the available experi- mental evidence to date. A review of the steadily increasing literature on spectroscopic and thermal imaging applications of these techniques is a powerful indicator of the promise they hold for conducting fun- damental and applied studies, primarily due to 1) the superior wealth of information obtained through pseudorandom photothermal exci- tation, as compared to the conventional frequency dispersive tech- niques and 2) the less destructive nature of the pseudorandom im- pulse response, compared to pulsed laser excitation.