探讨了用电子学全息干涉术(又称数字全息干涉术)测量温度场分布及其变化的可行性,利用所设计的全息干涉实验光路,对一电烙铁头部周围温度场分布进行了实时全息记录,进而利用一维快速傅里叶变换及数字滤波处理再现出了反映温度场分布的全息干涉条纹图样.实验结果表明,与传统的光学全息干涉术相比,电子学全息干涉术借助于高分辨率CCD记录及高速计算机数字处理技术,从而可实现光学全息图的数字化记录、存储和重现.同时,利用再现物场相位倍增原理还可实现对干涉条纹数目的倍增,或利用物场相位分布的直接计算精确获取任意两点间的相位差,从而提高测量精度.此外,由于能够在不改变光路的前提下以较高的重复频率完成光学全息图的记录,电子学全息干涉术可以用于记录三维物场的变化并接近实时地再现和测量三维物场的变化规律,因此是一种极有发展前途的新型实时全息干涉计量技术.

The feasibility of measuring the three-dimensional temperature distribution and its changing by digital (viz electronic) holographic interferometry is investigated. An experimental setup is designed to record the optical hologram of a temperature field directly by a CCD (charge coupling device) array with small size. By means of fast Fourier transform and spectrum filtering of the recorded holograms, the temperature distribution around the head of an electric iron is obtained. It is shown from the experimental results, that the digital holographic interferometry may be a novel holographic interferometry with high speed and promising applications by using high revolution CCD array and modern computer. It can be used to observe and measure the dynamic change of a three-dimensional object field in real time. Meanwhile, the number of the interference fringes can be multiplied by the principle of phase multiplication, or the phase different between two arbitrary points in the field can be directly calculated, so that the measuring precision can be greatly improved.