Absolute linear displacement measurement device

Abstract

The invention relates to the technical field of displacement measurement, in particular to an absolute linear displacement measurement device which comprises a ruler, a sliding read head, a signal source and a calculation unit. The ruler comprises M identical strip-shaped electrodes and multiple signal lines, the M strip-shaped electrodes are distributed side by side at an equal interval, and every N continuous strip-shaped electrodes form a spatial period; the sliding read head is used for moving along the M strip-shaped electrodes and is provided with one or more pick-up area, and the pick-up area covers N strip-shaped electrodes, detects excitation signals loaded on the covered strip-shaped electrodes and outputs a detected signal combination; the signal source is used for generating the excitation signals and allows the signal lines to load the excitation signals of different frequencies at the same time. The absolute linear displacement measurement device avoids the problems of delay and attenuation caused by control signal transmission, time for processing the signal combination is shorter, instantaneity is better, and cost is lower.

Description

technical field [0001] The invention relates to the technical field of displacement measurement, in particular to an absolute linear displacement measurement device. Background technique [0002] A linear encoder is a sensor that converts linear displacement into an electrical signal. According to the readout method, the encoder can be divided into two types: contact type and non-contact type. The contact type is generally not suitable for high-speed sports occasions and has poor durability, so it is not in the scope of discussion. A non-contact linear encoder generally consists of a static ruler and a sliding read head. There is scale information on the static ruler, and the sliding reading head is generally installed on the measured object, and moves with the measured object, and outputs a displacement signal by comparing with the scale information of the static ruler. [0003] A linear displacement measurement device usually includes a scale that can provide position in...

AI Technical Summary

Problems solved by technology

When the signal line exceeds 100 meters, the delay and attenuation of the signal are obvious;

[0009] 2. The method of time multiplexing requires additional hardware, such as switching circuits to control the "on" or "off" of different channels

This results in an increase in device cost;

[0010] 3. The essence of the time multiplexing method is serial processing, which takes a long time and requires a relatively long waiting time to obtain the required encoding information, and the real-time performance is affected

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