A Stepping Positioning System of Calibration Mechanism

Abstract

The invention discloses a stepping positioning system for a calibration mechanism. The stepping positioning system comprises a motor controller, a stepping mechanism and an in-place detection device. The stepping mechanism comprises a stepping motor which is used for driving the calibration mechanism to move; the in-place detection device comprises a first in-place detector, a second in-place detector and an in-place judger, wherein the first in-place detector is used for judging whether the calibration mechanism reaches a first calibration position or not and outputting an indication signal to the in-place judger, the second in-place detector is used for judging whether the calibration mechanism reaches a second calibration position or not and outputting an indication signal to the in-place judger, and according to the indication signals outputted by the first in-place detector and the second in-place detector, the in-place judger generates an in-place indication signal which is outputted to the motor controller; and the motor controller controls the movement or stoppage of the stepping motor of the stepping mechanism according to the received in-place indication signal. The stepping positioning system for the calibration mechanism has the advantages that: the calibration mechanism can be reliably and accurately positioned under the drive of the stepping motor.

Description

technical field [0001] The invention relates to a step positioning system of a calibration mechanism. Background technique [0002] In the field of space infrared remote sensing imaging, in order to ensure the imaging accuracy, it is necessary to calibrate the CCD frequently. The calibration mechanism stops at the 0° position at the non-calibration moment, and the high and low temperature black bodies are not in the imaging optical path; when calibration is required, the stepper motor first drives the calibration mechanism to move to the 45° position for high temperature calibration, and then moves to 90° ° position for low-temperature calibration, after the calibration is completed, the calibration mechanism directly returns to the 0 ° position from the 90 ° position, and does not stay at the 45 ° position. [0003] At present, the commonly used calibration mechanism positioning methods include: pulse counting step positioning method, in-position closed-loop positioning me...

AI Technical Summary

Problems solved by technology

However, this method needs to find the zero position again when powering on, and there is a risk of loss of synchronization due to increased friction during long-term operation

[0005] The traditional closed-loop positioning method generally uses photoelectric pairs for position detection, which is greatly affected by temperature, and the fault-tolerant hysteresis window is small. Motor jitter can easily cause misjudgment of the position signal, resulting in inaccurate positioning of the calibration mechanism, and even failure to stop.

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