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实时数字全息测量温度场研究

     

摘要

利用数字全息干涉术研究了气流温度场的分布,对实验中所采集的干涉条纹图像进行傅里叶变换,数字低通滤波和傅里叶逆变换处理以消除散斑噪声影响,确保了气流场干涉条纹相位信息的高对比度和低噪声,并对其进行提取和展开;根据理论研究的相位与折射率的关系求得气流场的温度分布,实验结果与热电测量的结果基本一致,表明了实时数字全息干涉术是一种测量温度场的有效方法,具有极好发展和应用前景.%Digital holographic interferometry is used to measure the temperature distribution of airflow field. A fast Fourier transform followed by a digital low-pass filter and an inverse Fourier transform are applied to interference fringes for removing speckle noise, so that airflow field phase information is in high-contrast and low noise. Phase is unwrapped to calculate phase difference. The temperature distribution is obtained by the relation between phase and refractive index. The results are consistent with the values measured by thermocouple. It is shown that the digital holographic interferometry is an effective method for measuring temperature field and the measuring precision can be greatly improved.

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