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Absolute type encoder and decoding measurement method thereof

An absolute encoder and measurement method technology, which is applied in the direction of measuring devices, instruments, and conversion sensor output, etc., can solve the problems of slow decoding speed, long processing time, and inability to decode, etc., and achieve fast decoding, strong real-time performance, and simple operation Effect

Inactive Publication Date: 2016-08-24
GUANGDONG UNIV OF TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

The research on absolute grating measurement technology in China is relatively late. In the current technology, the decoding method of absolute code channel generally has a complicated operation process, slow decoding speed, long processing time, and poor real-time performance, so it cannot be quickly decoded.

Method used

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  • Absolute type encoder and decoding measurement method thereof
  • Absolute type encoder and decoding measurement method thereof
  • Absolute type encoder and decoding measurement method thereof

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Experimental program
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Embodiment 1

[0076] refer to figure 1 , an absolute encoder, including a parallel light source 1, a circular encoder 2, an optical amplification system 3, an image sensor 4, an analog-to-digital converter 5 and a signal processing module 6, the circumference of the circular encoder 2 is provided with absolute Code track, the absolute code track is composed of a plurality of random light-transmitting or opaque code elements with the same width, its encoding rule is a pseudo-random code, and several consecutive code elements form an absolute position code, the parallel The parallel light beam emitted by the light source 1 irradiates the absolute code track and is reflected, then converges and enters the image sensor 4 through the optical amplification system 3, and the image sensor 4 is used to collect the arriving optical signal to obtain the coded image of the current measurement position and pass it through The digital image converted by the analog-to-digital converter 5 is sent to the si...

Embodiment 2

[0086] refer to image 3 , a decoding measurement method for an absolute encoder, comprising steps:

[0087] S1. Install the circular encoder 2 on the object to be measured, and drive the object to be measured to rotate;

[0088] S2. After irradiating the parallel light beam emitted by the parallel light source 1 onto the absolute code track and being reflected by the absolute code track, an optical amplification system is used to converge the reflected light beam onto the image sensor 4;

[0089] S3, the image sensor 4 acquires the coded image of the current measurement position after collecting the arriving light signal and sends it to the analog-to-digital converter 5;

[0090] S4, the analog-to-digital converter 5 converts the coded image from an analog image to a digital image and sends it to the signal processing module 6;

[0091] S5. The signal processing module 6 performs image processing on the coded image to obtain an absolute position measurement value.

[0092]...

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Abstract

The present invention discloses an absolute type encoder and a decoding measurement method thereof. The decoding measurement method comprises the steps of S1 installing a circular encoder on a to-be-tested object, and driving the to-be-tested object to rotate; S2 enabling the parallel light beams emitted out by a parallel light source to irradiate to an absolute code channel, after the light beams are reflected by the absolute code channel, adopting an optical amplification system to gather the reflected light beams to enable the light beams to irradiate to an image sensor; S3 after the image sensor acquires a reached optical signal, obtaining an encoding image at a current measurement position, and sending the encoding image to an analog-to-digital converter; S4 using the analog-to-digital converter to transform the encoding image from an analog image into a digital image and then sending to a signal processing module; S5 using the signal processing module to process the encoding image and then obtain an absolute position measurement value. The absolute type encoder and the decoding measurement method thereof are simple and rapid in operation and strong in real-time performance, can decode rapidly, and can be widely used in the absolute type encoder field.

Description

technical field [0001] The invention relates to the field of absolute position measurement, in particular to an absolute encoder and a decoding measurement method thereof. Background technique [0002] Encoders used for position measurement are widely used in the machining industry, and their performance affects the quality of machining. At present, the known encoders of tools used to precisely measure the movement displacement of objects mainly include incremental and absolute encoders. Among them, absolute encoders are gradually being used more and more. Its main advantage is that there is no need to find the reference origin, and the position can be measured when the power is turned off after the power is turned off. There is no need for "return to zero" operation, so it has a wide application prospect in CNC machine tools. [0003] Absolute encoders can be divided into absolute circular encoders and absolute grating rulers. The former is an encoder used to detect the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/347G01B11/00
CPCG01B11/002G01D5/3473
Inventor 王晗柴宁陈新陈新度巫孟良廖剑祥黄明辉李彬韩锦张芳健
Owner GUANGDONG UNIV OF TECH
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