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数字粒子测速ＤＰＩＶ（ｄｉｇｉｔａｌｐａｒｔｉｃｌｅｉｍａｇｅｖｅ－ｌｏｃｉｍｅｔｒｙ）技术是传统的ＰＩＶ（ｐａｒｔｉｃｌｅｉｍａｇｅｖｅｌｏｃｉｍｅｔｒｙ）技术的数字化方法，既能测得流场速度的大小，又可获得速度的方向。该方法根据数字信号分析的原理，对连续的两幅图象进行分析，寻找互相关函数的峰值。与其他的互相关方法相比，ＤＰＩＶ技术具有运算速度快的优点。该文详细介绍了ＤＰＩＶ技术的原理，并将其应用于潮汐流动表面流速的测量。成功的实现了非恒定流流速的测量。
Digital Particle Ticking DPIV (digital particle imagery-locimetry) is a digital method of traditional PIV (particleimagevelocimetry) technology, which not only can measure the velocity of flow field but also get the direction of velocity. According to the principle of digital signal analysis, the method analyzes two consecutive images and finds the peak value of the cross-correlation function. Compared with other cross-correlation methods, DPIV technology has the advantage of computing speed. This paper introduces the principle of DPIV technology in detail and applies it to the measurement of tidal flow surface velocity. The successful realization of the unsteady flow rate measurement.