在许多生产过程中,必须要对产品的速度进行高精度的连续测量,因为速度对整个生产流程来说,是很重要的。由于距离的原因、测量力太大的危害性以及高温的原因,或由于被测对象不允许吸收能量的关系,要采用机械接触式测量是不可能的。纵使可能,也使接触式测量变得困难复杂,其结果就是往往不能对速度进行充分的测定,而不得不用手动来校准生产 In many production processes, the product must be measured continuously at high speed with high accuracy, since speed is important for the entire production process. Due to the distance, the danger of measuring too much force and the cause of high temperature, or because the measured object does not allow the absorption of energy, the use of mechanical contact measurement is not possible. Even if possible, it makes contact measurement difficult and complicated, with the result that speed can not always be adequately determined and has to be manually calibrated