光栅卡卷尺测长技术

Grating caliper flexible rule technique

本文在光栅卡尺技术和力矩电机技术的基础上，把卡尺量程扩大到２０ｍ作成卡卷尺。利用力矩电机作为卡卷尺的卷紧机构和利用力矩电机作为保证光栅编码器标尺光栅平直度的施力元件，在此基础上，发展了光栅卡卷尺测长技术。基于莫尔条纹技术的光栅卡尺测长技术与其它现有长度测量技术相比成本较低、性能可靠，其测量精度可达０．０５ｍｍ甚至更高。为克服实际应用中卡卷尺的平直度对测量精度的影响，在系统设计中使力矩电机工作在堵转状态作为保证光栅卡卷尺标尺光栅平直的施力元件，并设计了线性调节的力距电机电源。对系统的检测表明，在２０ｍ测程内测量精度为０．１ｍｍ。

In this paper, the principle and the design of grating caliper flexible rule are reported, which is based on grating caliper rule technique and torque motor technique. Grating caliper rules are made taking advantage of More fringe technique. They have significant features of low cost, high reliability and high precision. In this system a torque motor is applied as a pull force exerting component to keep the caliper rule in linear attitude. This minimizes nonlinearity of the rules and also improves the measure precision. Simultaneously, a self adjusted current source for torque motor is designed. As a result, the measure precision is within 0 1mm in the range of 20m.