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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。
This paper discusses the feasibility of using electronic holographic interferometry (also known as digital holographic interferometry) to measure the distribution of temperature field and its changes. By using the designed holographic interferometer optical path, the real-time holographic distribution of temperature field around the head of electric soldering iron Record, and then use the one-dimensional fast Fourier transform and digital filter to reproduce the holographic interference fringe pattern reflecting the temperature field distribution. The experimental results show that compared with traditional optical holographic interferometry, electronic holographic interferometry can digitally record, store and reproduce optical holograms by means of high-resolution CCD recording and high-speed computer digital processing. At the same time, the multiplication of the number of fringes can also be realized by using the principle of phase multiplication of the object field, or the phase difference between any two points can be accurately obtained by using the direct calculation of the phase distribution of the object field to improve the measurement accuracy. In addition, electronic holographic interferometry can be used to record changes in three-dimensional object fields and to reproduce and measure changes in the three-dimensional object field in near real-time, since recording of optical holograms can be done at higher repetition rates without changing the optical path Therefore, it is a promising new real-time holographic interferometry technology.