Rotary grating encoder measuring device and method for measuring rotational displacement

Abstract

The invention discloses a rotary grating encoder measurement device. The device comprises a reflection type grating coded disc which is driven to rotate by a main shaft and a central processing module. An incremental code channel is arranged on the inner ring of the reflection type grating coded disc and an absolute code channel is arranged on the outer ring. A parallel light beam module, an inneroptical amplification module and an inner high speed image acquisition module are arranged in the reflection type grating coded disc. An outer parallel light beam module, an outer optical amplification module and an outer high speed image acquisition module are arranged out of the reflection type grating coded disc. The outer parallel light beam module gives out outer parallel light beams which irradiate the absolute code channel. The outer parallel light beams are reflected by the absolute code channel, and then reach the outer high speed image acquisition module through the outer optical amplification module. The inner high speed image acquisition module and the outer high speed image acquisition module transmit the acquired images to the central processing module. According to the invention, through macro-micro composition and the inner and outer code channels, high-precision grade measurement is achieved; the structure is simple; and the axial volume and the axial size of an encoder are greatly reduced.

Description

technical field [0001] The invention relates to the technical field of encoders, in particular to a measuring device for a rotary grating encoder and a method for measuring rotational displacement. Background technique [0002] Rotary encoders have been a hot spot in measurement research since their appearance. Rotary encoders used for measurement are generally divided into incremental and absolute, each of which has its own advantages and disadvantages. How to effectively combine the two methods has always been a problem that relevant experts and scholars in the field of encoders are committed to solving. In addition, traditional rotary encoder measurement systems usually use mechanical subdivision to improve measurement accuracy, but mechanical subdivision has certain limitations in application, because these methods generally have high requirements for optical systems such as imaging light sources, complex manufacturing processes, and The anti-interference ability is we...

AI Technical Summary

Problems solved by technology

In addition, traditional rotary encoder measurement systems usually use mechanical subdivision to improve measurement accuracy, but mechanical subdivision has certain limitations in application, because these methods generally have high requirements for optical systems such as imaging light sources, complex manufacturing processes, and The anti-interference ability is weak, not suitable for long-term, continuous, uninterrupted high-precision measurement

The equipment used in the traditional subdivision method is cumbersome in operation and complex in structure

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