A kind of optical height measurement method

Abstract

The invention relates to an optical altitude measurement method, comprising a moving mechanism, a fan-shaped laser device and an image capturing device, wherein the fan-shaped laser device is arranged on the front end of the moving direction of the moving mechanism; a fan-shaped horizontal light path sent by the fan-shaped laser device forms a light band with the ground; the light band is perpendicular to the moving direction of the moving mechanism; the image capturing device is arranged on the moving mechanism; an intersection point between the optical axis of the image capturing device and the ground is located on the light band; during the movement process of the moving mechanism, a measured object is located on the moving path of the intersection point between the optical axis of the image capturing device and the ground; based on the devices and an optical calibration principle, a non-contact measurement way aiming at the altitude of the measured object is realized. The optical altitude measurement method is simple and easy to realize, and enables the accuracy of finally-measured altitude data of the measured object to be guaranteed.

Description

technical field [0001] The invention relates to an optical height measuring method. Background technique [0002] At present, the commonly used non-contact measurement devices are mostly carried out by using a preset calibration object, such as placing a standard piece with a known length next to the object to be measured, but the main disadvantages of this method are: 1. For continuously changing areas The measurement needs to install a variety of calibration objects, which is time-consuming and labor-intensive; 2. Since the calibration objects are placed at a certain distance, the calibration is inaccurate, and it is difficult to realize the track application that requires a gap of centimeters; 3. When the aspect ratio is not 1 : When 1, it is prone to proportional reduction or enlargement errors in the measurement results in the length direction or width direction. In order to solve the problem of continuity and aspect ratio of the calibration object, some literatures ha...

AI Technical Summary

Problems solved by technology

[0002] At present, the commonly used non-contact measurement devices are mostly carried out by using a preset calibration object, such as placing a standard piece with a known length next to the object to be measured, but the main disadvantages of this method are: 1. For continuously changing areas. The measurement needs to install a variety of calibration objects, which is time-consuming and labor-intensive; 2. Since the calibration objects are placed at a certain distance, the calibration is inaccurate, and it is difficult to realize the track application that requires a clearance of centimeters; 3. When the aspect ratio is not 1 : When 1, it is prone to proportional reduction or enlargement error in the measurement results in the length direction or width direction

However, this method can only measure the distance between the object and the measuring point, and cannot obtain the height of the object (that is, the dimension perpendicular to the line connecting the measuring point of the object); at the same time, the measurement range, accuracy and the motion state of the measured object are greatly limited.

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