Force actuator for active mirror surface support and control system of force actuator

Abstract

The invention discloses a force actuator for active mirror support and a control system of the force actuator. The force actuator comprises an integrated motor and driver module, a pressure sensor displacement control module and a pressure sensor, wherein the pressure sensor displacement control module comprises a parallel unit formed by connecting a pressure spring and a tension spring in parallel. The control system comprises a motor driving system, a pressure sensor acquisition system and an upper computer, the upper computer obtains a force required to be adjusted corresponding to a mirror surface shape at a connection position of the pressure sensor and a mirror surface through an active surface shape correction method; the pressure sensor reads a pressure value acquired by a strain acquisition module and adopts the pressure value as a feedback value of the force actuator; the pressure is subjected to closed-loop adjustment through a preset period; an adjusted output signal is used for controlling the rotating speed of a motor; the rotating motion of the motor is converted into linear motion; and the parallel unit is compressed or stretched to generate correction force, so that accurate control over the mirror surface shape is carried out.

Description

technical field [0001] The invention relates to the field of information collection, in particular to a force actuator used for active support of a mirror in an astronomical instrument and a control system thereof. Background technique [0002] Astronomical instruments are widely used in important fields such as astronomical observation and the law of celestial body motion, especially astronomical telescopes play a great role in scientific research. At present, the main technical development trend of astronomical telescopes is towards the technical direction of large aperture, large field of view, and high observation accuracy, and the operating environment is harsh and the temperature range is large. Correspondingly, higher requirements are put forward for the surface shape of key mirrors in the system. The traditional passive mirror support method is more susceptible to changes in the mirror surface shape caused by factors such as gravity field environment and temperature...

AI Technical Summary

Problems solved by technology

[0004]At present, the control system for the force actuator in the active mirror support system on the market is mainly composed of imported mature multi-channel acquisition modules or traditionally built analog circuits, motors and The driver is implemented separately. This method mainly has the following disadvantages: First, the mature multi-point acquisition module on the market has the disadvantages of limited number of points, high cost, inflexible development, and strong dependence; second, the algorithm is complex 1. Susceptible to external interference, the accuracy is difficult to guarantee; 3. The force actuator and the motor are controlled separately, which makes the control complicated and difficult to integrate. Once a problem occurs, it is not easy to troubleshoot and detect.

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