利用光纤检定激光测距仪的研究

Calibrating laser rangefinder using fiber

为保证激光测距仪的精度和可靠性,必须要对它进行定期检定。常用的检定法是在经过精密测量的野外基线场上采用六段比较法求得。而这种野外基线场需占用大量的土地资源,检定受地质条件、地理位置、地面建筑构造、气象与温度等环境因素的影响,并且野外作业工作量大,一直是国内外研究所关注的问题。本文通过利用光纤放入室内,代替野外基线来检测激光测距仪这一国内外所关注的问题进行了初步的理论分析与实验研究。分析了用作基线的光纤类型的选择以及耦合方式的选取,研究了耦合、光波、温度对光波在光纤中传输光程的影响。理论分析与实验验证基本符合,说明用光纤在室内代替野外基线来检定激光测距仪是可行的。

To ensure the accuracy and reliability of the laser rangefinder, it is necessary to calibrate it regularly, The common calibration method is to use six lines comparative law in the outdoor baseline yard of precision measurement. But this outdoor baseline yard occupies large areas of land resources, and the calibration result is affected by environmental factors such as the geological, the geography location, the ground building, the climate and the temperature, etc. Meanwhile the outdoor operation is hard. In this article, a preliminary theoretical analysis,and experimental research was done by using the indoor fiber to replace the outdoor baseline yard to calibrate laser rangefinder. The principles of measurement, the selection of optic fiber types and the coupling mode were described. Furthermore, the effect of optic fiber coupling, light wave and temperature on the fiber-optic transmission was analyzed and studied. The theoretical analysis was consistent with the experimental verification. Experiment shows it is feasible to calibrate laser rangefinder by using the indoor optical fiber to replace the outdoor baseline yard.