A zero-position compensation method for temperature drift of strain-type angle sensor

Abstract

The invention belongs to the technical field of dynamic beam orientation, and discloses a temperature drift zero position compensation system of a strain-type angle sensor, comprising: an outer ring CCD, which respectively measures the beam angle deviation in the x-axis and y-axis directions of a pendulum table, and the beam angle deviation is combined with The environmental disturbance is sent to the angle controller to form the angle master, and the angle master combined with the optimized output of the zero compensator is sent to the inner loop drive controller to give the swing table control voltage, and the piezoelectric deflection mirror is driven to swing by driving the swing table. The sensor feeds back the swing angle of the swing table in real time to the zero position compensator, and the zero position compensator obtains the optimized output according to the creep interference of the swing table, the temperature effect of the angle sensor and its thermal output, and transmits it to the drive controller to realize the drive closed-loop control. The invention realizes on-line calculation and compensation for the creep interference of the swing table and the thermal output of the sensor, and controls the zero drift in a small range during long-term directional operation in a complex temperature environment, and realizes the optimized output of the sensor output data.

Description

technical field [0001] The invention belongs to the technical field of dynamic beam orientation, and relates to a temperature drift and zero position compensation method for a micro-displacement piezoelectric driven deflection mirror strain angle sensor, so as to improve its positioning accuracy in a complex temperature environment. Background technique [0002] In order to further improve the tracking accuracy of the photoelectric tracking system, many domestic and foreign companies use dynamic beam orientation technology to keep the beam in a certain direction or lock the beam convergence near a fixed point in space, so that the imaging target is stable in the specified range in the field of view. . In order to improve the control bandwidth, the planar reflector is driven by a micro-displacement piezoelectric drive controller with a higher operating frequency, also known as a piezoelectric deflection mirror. Such as figure 1 As shown, in a typical dynamic beam orientatio...

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Problems solved by technology

However, due to the use of the strain gauge angle sensor package, it is relatively sensitive to temperature changes, and its temperature effect cannot be ignored. In addition, the creep phenomenon of the piezoelectric ceramic itself and its temperature characteristics and other influencing factors cause the sensor to appear when working in a complex temperature environment. A certain degree of zero drift affects the positioning accuracy of the deflection mirror and even stimulates oscillation or divergence, thus limiting the scope of use of the piezoelectric deflection stage

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