Electric filter dimming device control circuit

Abstract

An electric filter dimming device control circuit completes accuracy control of the electric filter dimming device by signal processing and logic control in a programmable logic device, the method comprises the following modules: a signal receiving module A, a signal processing module B, a control module C, a drive distribution module D and a signal feedback module E. The invention solves the problem of automatic control of the dimming devices of photoelectric instruments and flexibly realizes gear switching of the electric filter dimming device; the invention further has stable working performance, is easy to expand and upgrade and satisfies the automation requirements of modern optical instruments.

Description

technical field [0001] The invention belongs to the field of optical instruments and photoelectric imaging, and in particular relates to a control circuit of an electric filter mirror dimming device. Background technique [0002] The motorized filter dimming device is a dimming device widely used in the fields of optical instruments and photoelectric imaging, which can correct the incoming light of a charge-coupled image sensor (CCD). Adding a filter dimming device to the optical system can improve the contrast between the object and the background, thereby obtaining better image clarity. A general electric filter dimming device is mainly composed of a dimming motor, a worm rolling bearing, a worm wheel, a position diode, a filter, a code disc, etc., such as the application number of an existing three-line coding dimming device: 200810239212.7C. figure 1 It is a schematic diagram of the coding disc of the electric filter dimming device, wherein, gear group number 1 to gear ...

AI Technical Summary

Problems solved by technology

An existing mobile filter control method and system application number is 200810065623.1, which can execute commands to open and close the mobile filter or automatically switch the working state of the mobile filter, but can only open or close the filter. Can't switch between filters in different gears

However, due to changes in the application scenarios of optical instruments and the external environment, such as: different seasons and weather, the high angle of the sun and the characteristics of the scene, and the changes between night and day, the intensity and spectrum of the incident light vary greatly. In order to obtain a clear image on the CCD , under different environmental backgrounds, it is necessary to quickly and accurately control the filter dimming device, and perform shift dimming between filters with different transmittances

Images