Embedded laser displacement sensor and normalization processing method thereof

Abstract

The invention provides an embedded laser displacement sensor. The embedded laser displacement sensor comprises parts of an emission light filter, an emission lens set, a laser device, a casing, a processing circuit, a socket, a cable, a photoelectric device, a receiving lens set and a receiving light filter. The embedded laser displacement sensor is characterized in that all the parts of the embedded laser displacement sensor are integrated on a measuring probe to realize the embedded measuring process. The processing circuit realizes self-adaption control on output light intensity and modulation frequency of the laser device, a feedback signal is from the sampling data of the photoelectric device, a waveform peak value of light spot imaging is employed unifiedly as the feedback information, the output light intensity and the modulation frequency of the laser device are controlled, so a measuring error caused by change of a detected object is avoided. The processing circuit makes the digital position signal of the light spot imaging acquired through sampling be in one-to-one correspondence with a reference displacement to acquire a measuring curve, then successive polynomial fitting of the measuring curve is employed to eliminate a non-linear measuring error, and thereby all the sensors have standard normalization output.

Description

technical field [0001] The invention relates to a sensor in the technical field of displacement measurement, in particular to an embedded laser displacement sensor and a normalization method. Background technique [0002] At present, the manufacturing industry has put forward higher and higher requirements for various online detection methods. In addition to high-precision, non-contact, digital and other measurement performance requirements, there are also requirements for maintenance performance such as stability, versatility, and interchangeability. It is also increasing day by day in order to continuously reduce maintenance costs, which has become a recognized future trend in the field of online testing. Among them, displacement is an important measurement content, which is widely used in various fields of industrial inspection. As a non-contact measurement method in photoelectric detection, the laser triangular displacement sensor has the advantages of fast measurement ...

AI Technical Summary

Problems solved by technology

This not only increases the computing workload of the host computer, but also cannot meet the requirements of plug-and-play and computing-free embedded systems.

[0005] On the other hand, when the existing laser displacement sensors measure different targets, due to the different target surface characteristics (such as color, roughness, texture, etc.), the quality of the received signal waveform will generally be different or even greatly reduced, thus causing Large measurement errors, even cause the sensor to fail to work

This is also the common defect of this type of laser displacement sensor.

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