Truck volumetric measurement method based on laser triangulation

A technology of laser triangulation and volume measurement, which is applied in the direction of measuring devices, optical devices, instruments, etc., can solve the problems of lower reliability, lower precision, and slow scanning speed, etc., and achieve good practical results

Inactive Publication Date: 2011-03-02
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: ① The accuracy of this measurement method depends on the angular resolution of the pulsed laser 3D scanner, the scanning speed and the laser divergence angle of the pulsed laser
Since the rotary scanning of the laser 3D scanner is driven by a stepping motor, the frequency and angular resolution cannot be too high, so the angular resolution is low and the scanning speed is slow when scanning large-volume objects.
The light sources of existing laser 3D scanners all use semiconductor lasers, and the divergence angle is relatively large. When the distance of the measured object is far away, the accuracy drops rapidly; The top-covered tarpaulin is highly absorbing of infrared light, greatly reducing the reliability of the method

Method used

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  • Truck volumetric measurement method based on laser triangulation
  • Truck volumetric measurement method based on laser triangulation
  • Truck volumetric measurement method based on laser triangulation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Step 1. Obtain the length L of the vehicle under test. The specific operation is:

[0040] Step 1: Set three measurement points A, B, and C sequentially along the vehicle driving direction in the green channel of the expressway; the distance between the first measurement point A and the second measurement point B is S 1 is 9.96 meters; the distance between the first measuring point and the third measuring point is S 2 It is 17.06 meters. Install a photoelectric trigger for sensing the arrival and departure of the measured vehicle on the three measurement points A, B, and C respectively; install an axle detection to obtain the number of axles of the measured vehicle 10 meters before the first measurement point A Device 13;

[0041] Step 2: when the vehicle under test 11 passes the axle detector 13, the device acquires the axle number n=4 of the vehicle under test;

[0042] Step 3: When the front part of the vehicle under test 11 reaches the first measurement point A, ...

Embodiment 2

[0057] Step 1. Obtain the length L of the vehicle under test. The specific operation is:

[0058] Step 1: Set three measurement points A, B, and C sequentially along the vehicle driving direction in the green channel of the expressway; the distance between the first measurement point A and the second measurement point B is S 1 is 9.96 meters; the distance between the first measuring point and the third measuring point is S 2 It is 17.06 meters. Install a photoelectric trigger for sensing the arrival and departure of the measured vehicle on the three measurement points A, B, and C respectively; install an axle detection to obtain the number of axles of the measured vehicle 10 meters before the first measurement point A Device 13;

[0059] Step 2: when the vehicle under test 11 passes the axle detector 13, the device acquires the number of axles n=6 of the vehicle under test 11;

[0060] Step 3: When the front part of the vehicle under test 11 reaches the first measurement po...

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PUM

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Abstract

The invention discloses a truck volumetric measurement method based on laser triangulation, comprising the following steps: three measuring points are arranged in sequence along the vehicle travelling direction on a vehicle travelling channel; each measuring point is provided with a sensing device for sensing arrival and departure of the measured vehicle; a sensing device for acquiring car axle quantity of the measured vehicle is arranged at a set position in front of a first measuring point; the four sensing devices are used for acquiring length of the measured vehicle; a laser device and a video camera are arranged above the center line of the vehicle travelling channel; a cylindrical lens which causes laser beams to irradiate on a horizontal plane so as to form laser bars is additionally arranged in front of the laser device; length and position of the laser bars on vehicle roof, which are shoot by the camera video are used for acquiring width and height of the measured vehicle so as to work out volume of the measured vehicle. The method disclosed by the invention has advantages of practicability and reliability and can reduce costs for measuring the volume of trucks.

Description

technical field [0001] The invention relates to a method for measuring the volume of a truck based on a laser triangulation method, which belongs to the field of non-contact measurement. Background technique [0002] Among the current vehicle measurement methods, few are used for the volume measurement of the whole vehicle, and most of them are for the processing error detection of vehicle components. The existing vehicle volume measurement technology method is to use a pulsed laser three-dimensional scanner to measure the vehicle volume, specifically: through the three-dimensional laser scanner installed on the upper part of the vehicle driving passage, the outer contour of the vehicle under test is scanned, and the measured vehicle volume is obtained. The three-dimensional coordinate scanning point collection of the outer contour of the vehicle is measured, the three-dimensional laser scanner is connected to the computer, and the special measurement software running in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/00G01B11/02
Inventor 邢冀川
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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