Linear motion detection device

Abstract

The invention relates to a linear motion detection device, which comprises an encoder, detection blocks, a detection controller, a data acquisition unit and a data processing unit, wherein the detection blocks output two pairs of orthogonal signals, and the detection controller receives and combines the signals output by the detection blocks through an optical fiber; the data acquisition unit is connected with the detection controller, and is used for receiving and conditioning the output signals after being combined by the detection controller; and two pairs of final orthogonal signals output by the data processing unit are sent to the data processing unit, and the detection blocks are arranged in a super-orthogonal way. The linear motion detection device meets the entire measurement requirements, adopts an eddy current proximity switch, and prevents the impact of larger particles of dust or foreign objects; the 'super-orthogonal' way is adopted, so that the position detection accuracy is twice that of original single orthogonal counting method; and a Kalman filter principle is used to obtain precise dynamic performance parameters.

Description

technical field [0001] The invention relates to the field of precision instruments, in particular to a linear motion detection device. Background technique [0002] The existing linear motion detection methods include direct measurement and indirect measurement. Devices that use direct measurement methods include linear gratings, linear induction synchros, and laser interferometers. These devices are directly installed on the measured object, and the measurement results can directly reflect the linear displacement, with high measurement accuracy, but there are some shortcomings as follows: [0003] 1. Measuring devices such as linear gratings and linear induction synchronizers must have the same length as the linear motion stroke. The high cost is a big limitation for the adoption of such measuring devices on large CNC machine tools. And for some linear motions with a very long motion path (such as train running), the cost generated by using this type of measuring device ...

AI Technical Summary

Problems solved by technology

This shortcoming is more prominent when the detection environment is harsh and the measurement distance is long

When large particles of dust or foreign matter appear in the measurement range, the optical path of this type of detection device will be affected, which will seriously affect the detection accuracy of the linear motion process

[0005] 3. The installation requirements of existing high-precision detection devices are very high

However, the disadvantage of the indirect measurement device is that the transmission chain error from rotary motion to linear motion is added to the measurement signal, which affects the measurement accuracy.

In some extreme cases (for example, the rotating part slips when the object is started), this shortcoming is more prominent

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