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最近,随着造船、土木工程、建筑等构件的大型化,测量范围越来越大,目前已经要求能对10～1000m 的范围进行高精度的长度测量.光波测长装置即为适应此种需要而研制的。光波测长装置的原理是以光的速度作为基准来测量距离,即出基准点发射出的光经置于被测点的反射体反射,采用光电测量方式测出发射光返回原位置所需的瞬时。这种方法有两种类型,一种是利用迅速上升的光脉冲,发光后触及目标,然后通过同步脉冲测量出反射回来的时间,它适用于到月球之类的长距离测量;另一种是用适当的频率来调节连续发射的光,再测量出一如上述传输信号的光与回折光的相位差,并算出往返时间,这种方式适用于较近距离的测量.
Recently, as shipbuilding, civil engineering, construction and other components become larger and larger, the measurement range has been increasingly required, and high-precision length measurement in the range of 10 to 1000 m has been required so far. And developed. The principle of optical wavelength-measuring device is to measure the distance based on the speed of light, that is, the light emitted from the reference point is reflected by the reflector placed at the measured point, and the photoelectric measurement method is used to measure the required light Instantaneous. There are two types of this method. One is to use a rapidly rising light pulse, touch the target after glowing, and then measure the time back by the sync pulse, which is suitable for long-range measurements such as the moon; the other is With the appropriate frequency to adjust the continuous emission of light, and then measured as the transmission of signal light and back to the light phase difference, and calculate the round-trip time, this method is suitable for more recent measurements.