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Sand grains escaping from a soil surface into aeolian sand transport is an important process, which is called sand emission. The rate of the sand grains escaping from the surface, which is named the sand emission rate, reflects the quantity of the sand grains moving upward from the surface per unit time and unit area. Sand emission rate plays an important role in the estimation of soil erosion rates and sediment transport rates. Many scholars have studied sand emission rate, but they have found it is difficult to measure directly. In recent years, the continuous development of optical particle image velocimetry (PIV) technology has been introduced into the study of windblown sand movement. Its advantage is that an instantaneous, contactless measurement of a whole field can be achieved.