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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Differential sensor in front photopyroelectric technique: I. Theory
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Differential sensor in front photopyroelectric technique: I. Theory

机译：前光电热释电技术中的差分传感器：I.理论

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摘要

In this paper the theory of the differential front photopyroelectric technique is developed. The thermal effusivity measurements of a sample through photopyroelectric direct (no-differential) experiments do not have sufficient resolution and accuracy to detect small changes in the thermal effusivity. To assess minor variations in this thermal magnitude, differential methods should be used. These methods compare properties of a reference sample and another unknown sample, which are placed separately in both halves of the differential cell. It is shown that in order to achieve better metrological properties of the differential measurement and electromagnetic interference immunity, the signals of both halves must be subtracted directly at the output of the two parallel connected pyroelectric sensors. The thickness of the samples should have the maximum possible value, at least 10 times higher than the thermal diffusion length for minimum frequency. The results of numerical simulations for the amplitude, phase, real and imaginary parts with water as a reference sample and the other sample with a thermal effusivity very close to that of water ( contaminated water) are presented. These results show that measurements should be made in the nearly ideal voltage mode, which ensures a better signal-to-noise ratio than the ideal current mode.
机译：本文提出了差分前沿光热电技术的理论。通过光电热电直接（无差）实验对样品进行的热效率测量没有足够的分辨率和精度来检测热效率的微小变化。为了评估该热值的微小变化，应使用差分方法。这些方法比较了参考样品和另一个未知样品的属性，这两个样品分别放置在差分细胞的两半中。结果表明，为了获得更好的差分测量的计量性能和抗电磁干扰性，必须在两个并联的热释电传感器的输出端直接减去两个半部的信号。样品的厚度应具有最大可能值，至少要比最小频率的热扩散长度高10倍。给出了以水为参考样品，而另一个热效率非常接近水（被污染的水）的样品的振幅，相位，实部和虚部的数值模拟结果。这些结果表明，应该在接近理想的电压模式下进行测量，这可以确保比理想的电流模式更好的信噪比。

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