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在探月工程中,为了实现基于空间应用光谱仪的多目标光谱探测,需要设计满足轻小型和高可靠性的二维指向机构。目前,超声电机作为驱动源,精密电位计作为一种位置传感器,因其自身的优良性能正逐步应用于精密仪器和定位技术中。基于此,设计了由超声电机、精密电位计和扫描镜组成的二维指向机构,并以一维指向模型为工程样机,通过设计闭环控制电路和指向控制机制进行功能测试,验证了该机构空间应用的可行性。为了测量精度,搭建实验室测试平台,并进行多次指向试验,通过对测试结果进行分析,提出提高指向精度的方案。
In the lunar exploration project, in order to realize multi-target spectral detection based on space-based spectrometers, two-dimensional pointing mechanisms that meet the requirements of lightness, small size and high reliability have to be designed. At present, the ultrasonic motor as a driving source, precision potentiometer as a position sensor, because of its excellent performance is gradually applied to precision instruments and positioning technology. Based on this, a two-dimensional pointing mechanism composed of ultrasonic motor, precision potentiometer and scanning mirror is designed. The one-dimensional pointing model is taken as the engineering prototype, and the function test is carried out by designing closed-loop control circuit and pointing control mechanism. Application of feasibility. In order to measure the precision, set up a laboratory test platform, and conduct multiple pointing experiments. By analyzing the test results, the scheme to improve the pointing accuracy is proposed.