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首页> 外文期刊>Bulletin of the American Physical Society >APS -2017 Fall Meeting of the APS New England Section- Event - Relative emissivity measurement through photoacoustic effect
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APS -2017 Fall Meeting of the APS New England Section- Event - Relative emissivity measurement through photoacoustic effect

机译：APS -2017年APS新英格兰地区秋季会议-活动-通过光声效应进行相对发射率测量

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Determination of emissivity with great accuracy is significant for temperature measurement by pyrometry, radiation heat transfer and so on. Normally, emissivity is determined directly by measuring the ratio of radiation of the sample to the blackbody or indirectly through measurement of reflectance. ?Here, a new method employing the photoacoustic effect is introduced for emissivity measurement. Radiation of two different samples goes into an acoustic cell alternately by rotating two chopping wheels out of phase. The radiation difference will result in the generation of acoustic waves which are recorded by a lock-in amplifier. Raising the temperature of one sample while keeping the other one at constant temperature will eventually result in a balanced state where radiation from two samples at different temperatures is equalized. By recording the amplitude and phase of the acoustic signal and the temperature difference simultaneously, the balanced null point could be accurately determined, thus resulting in an accurate measurement of emissivity. Emissivities of teflon, PVC, polystyrene sheet and aeroglaze Z306 are given.
机译：高精度确定发射率对于通过高温测定法，辐射传热等进行温度测量具有重要意义。通常，发射率直接通过测量样品对黑体的辐射比来确定，或者间接通过反射率的测量来确定。此处介绍了一种采用光声效应的新方法进行发射率测量。通过使两个斩波轮异相旋转，两个不同样本的辐射交替进入声学单元。辐射差异将导致生成声波，并由锁相放大器记录。升高一个样品的温度同时将另一个样品保持恒定温度将最终导致平衡状态，在该状态下，来自两个样品的不同温度下的辐射被均衡。通过同时记录声信号的幅度和相位以及温度差，可以准确确定平衡的零点，从而可以精确测量发射率。给出了聚四氟乙烯，聚氯乙烯，聚苯乙烯片和气雾剂Z306的发射率。

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