Laser Doppler Anemometry (LDA) is a non-contact optical method for measuring flow velocity.
激光多普勒测速技术(LDA)，是一种流体速度的无接触式光学测量方法。
An optical method was introduced for measuring the thickness of solid thin films.
介绍了一种测量固体薄膜厚度的光学方法。
A new technique for measuring large displacement of object by non-contact optical method is presented.
提出了一种非接触光学法——单光栅双图像法测量物体大位移的新技术。
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