Device and method for mechanically controlling exposure time

A technology of exposure time and mechanical control, which is applied to control exposure, optics, cameras, etc., can solve problems such as motor speed control, and achieve the effects of large dynamic range, good uniformity, reliability, and high precision
CN101634792AInactive Publication Date: 2010-01-27NAT SPACE SCI CENT CAS
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
NAT SPACE SCI CENT CAS
Publication Date
2010-01-27
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention provides a device for mechanically controlling exposure time, which comprises a disc-like shutter with a fan-shaped hole, a direct current brushless motor for controlling the rotation of the disc-like shutter, and a control circuit for controlling the rotational speed of the direct current brushless motor, wherein the control circuit is used for computing the rotational speed of the direct current brushless motor according to the currently-required exposure time and the current position of the disc-like shutter, and controlling the direct current brushless motor to work at the rotational speed. The invention simultaneously provides a corresponding method for controlling the exposure time. The device and the method utilize a speed modulation and large-hole residing mode to realize the exposure time, and can realize 27 segments of exposure time, wherein the minimum accurate exposure time can reach 2 ms and the maximum accurate exposure time can be infinitely extended upwards, thus the dynamic range is wide; the consistency, the uniformity and the reliability are all good; the accuracy is high; and the device and the method can be applied to aerospace systems and ground systems.
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Description

technical field

[0001] The invention belongs to the technical field of space astronomical observation, in particular, the invention relates to an exposure time control device and a control method of an imaging observation instrument. Background technique

[0002] Exposure time control device is a key component in imaging instruments for astronomical observation. For some imaging instruments, such as imaging instruments in the solar X-ray band, the exposure time control device needs to be greater than 10 4 Order of magnitude dynamic range for clear images of the sun in different conditions. Exposure time control devices for space applications need to meet space operation requirements such as radiation resistance, high uniformity, long life, and high reliability, so common exposure time control devices cannot meet the requirements for use. Brushless DC motor has many advantages such as uniform speed, fast steering, long life, good positioning ability, etc. It is widely used ...

Claims

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