CN111561879A - A detection system and method for extracting rail profile curve by infrared laser irradiation - Google Patents

Abstract

The invention discloses a detection system for extracting a steel rail contour curve by infrared laser irradiation, which comprises a hardware module and a software module, wherein the hardware module comprises a PC (personal computer) and a laser contour sensor consisting of a CCD (charge coupled device) camera, 650nm infrared linear laser and an embedded mainboard of an ARM-v7 chip, and the PC is connected with the laser contour sensor; the software module comprises: the USB communication module driver, the command sending module, the data receiving and storing module and the data reading and establishing model module; the invention has low cost, simple structure, strong universality, can be used for detecting directly, can also be used as a vehicle-mounted detection system and a handheld detection system, and the system has the characteristics of easy maintenance and redevelopment.

Description

A detection system and method for extracting rail profile curve by infrared laser irradiation

technical field

The invention belongs to the technical field of optoelectronic information, and in particular relates to a detection system and method for extracting rail profile curves by infrared laser irradiation.

Background technique

With the rapid development of high-speed railway transportation in my country, high-speed railway transportation is one of the must-choice modes of travel for everyone. At present, my country's "eight horizontal and eight vertical" railway network has hundreds of millions of transports every year, which imposes a considerable load on the "cornerstone" of high-speed railway transportation - steel rails, and the wear and tear of the steel rails is quite large. of.

At the same time, as of 2019, the operating mileage of my country's high-speed railways has reached 35,000 kilometers, and in the next few years, my country's high-speed railway lines will still have considerable development. Under this huge number, the wear of rails is a problem that cannot be ignored. Excessive wear of rails will pose a huge threat to the safety of running trains. Therefore, it is necessary to quickly, safely and conveniently carry out wear detection of rails.

SUMMARY OF THE INVENTION

In order to solve the above-mentioned problems of the prior art, the present invention provides a detection system and method for extracting rail profile curves by infrared laser irradiation. The present invention is the primary functional module of the wear detection system, and the purpose is to obtain the profile and facilitate the rapid detection of various detection system solutions. composition.

The technical scheme adopted in the present invention is:

A detection system for extracting rail profile curve by infrared laser irradiation, including hardware module and software module. sensor, the PC is connected with the laser profile sensor;

The software module includes: a USB communication module driver, a command issuing module, a data receiving and storage module, and a data reading and building model module;

The hardware module scans the contour of the rail to obtain initial contour data, and the software module processes and visualizes the contour data obtained by the PC.

Further, a 650nm infrared laser is connected to the embedded motherboard of the ARM-v7 chip in the laser profile sensor, and the switch of the laser is controlled by the ARM-v7 chip; A CCD camera equipped with a 650nm filter, the ARM-v7 chip controls the CCD camera to collect images and output data after processing; the PC is connected to the laser profile sensor through a USB communication module drive.

Further, in the software module, the software drives the USB communication module to communicate with the laser profile sensor. At this time, the software can send commands to the laser profile sensor through the command issuing module through this communication; the data obtained by the laser profile sensor is driven by the USB communication module. The data is transmitted to the software, and the software stores the data locally through the data receiving and storage module; the software processes the local data through the data reading and building model module to model the contour model.

Further, the hardware module can output the contour data obtained from the current position 50 times within 1 second to the software module.

A detection method for extracting a rail profile curve by infrared laser irradiation, comprising the following steps:

Step 1, fix the laser profile sensor on the rail;

Step 2, data collection:

Step 2.1: The PC software sends the scan start command in the command issuing module to the laser profile sensor through the USB communication module driver. After the ARM-v7 chip receives the command, it controls the 650nm infrared laser and the CCD camera to start scanning, and the CCD camera transmits at this moment. The recorded picture is sent to the ARM-v7 chip, and the CCD camera outputs the speed transmission data of the contour data obtained from the current position 50 times every 1 second, until the PC software selects the stop option and sends the stop command to the laser contour sensor. stop scanning;

Step 2.2: The laser profile sensor scans a laser line on the rail. Due to the width of the laser line, the directly extracted profile line is actually a very narrow profile surface, so the ARM-v7 chip performs image binarization on the transmitted image. Processing, filtering and processing the data of multiple laser lines through the mathematical theory of the median theorem, and then driving the laser contour sensor through the USB communication module to obtain an accurate contour line and output it to the PC;

Step 3, the laser profile sensor measures the (Z, X) value of each point on the bright line, and the PC stores the data locally through the data receiving and storage module in the software;

Step 4, the software builds a model through data reading, processes the local data, and then models the contour model, converts the (Z, X) value of each point into the values of the x-axis and y-axis of the rail profile, and displays the rail on the screen. Rail head standard profile.

Further, in the step 1, the linear laser emitted by the laser profile sensor is parallel to the rail section, the horizontal distance between the laser profile sensor and the highest point of the rail is 30cm, and the height distance is 30cm, and the CCD camera is contrasted above the rail, in the vertical direction. The included angle is 45 degrees.

Compared with the prior art, the effective effects of the present invention are as follows: the detection system has low cost, simple structure and strong versatility, can be used as a vehicle-mounted detection system and a hand-held detection system, and can also be directly used for detection; The system has the characteristics of easy maintenance and redevelopment, and its own performance can be selected and redeveloped by subsequent plan decision makers and developers.

Description of drawings

1 is a structural block diagram of a detection system for extracting rail profile curves by infrared laser irradiation;

2 is a flowchart of a detection method for extracting rail profile curves by infrared laser irradiation;

3 is a schematic diagram of a detection system for extracting rail profile curves by infrared laser irradiation;

4 is a perspective view of a detection system for extracting rail profile curves by infrared laser irradiation;

5 is a schematic diagram of a laser profile sensor in the present invention;

Figure 6 is a graph obtained by PC processing modeling.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

As shown in Figure 1, a detection system for extracting rail profile curves by infrared laser irradiation includes hardware modules and software modules. Processed and visualized, the hardware module can output the contour data acquired at the current position 50 times within 1 second to the software module.

The hardware module includes a PC, a laser profile sensor consisting of a CCD camera, a 650nm infrared laser and an embedded motherboard with an ARM-v7 chip. The PC is connected to the laser profile sensor through USB3.0; the ARM-v7 in the laser profile sensor A 650nm infrared laser is connected to the embedded motherboard of the chip, and the switch of the laser is controlled by the ARM-v7 chip; a CCD camera equipped with a 650nm filter is connected to the embedded motherboard of the ARM-v7 chip, and the ARM-v7 The chip controls the CCD camera to collect images and process them to output data. The schematic diagram of the laser profile sensor is shown in Figure 5.

The software module includes: USB communication module driver, command issuing module, data receiving and storage module, and data reading and building model module; in the software module, the software drives the USB communication module driver to communicate with the laser profile sensor, and the software can communicate with the laser profile sensor through this communication. The sending module sends commands to the laser profile sensor; the laser profile sensor obtains data and transmits the data to the software through the USB communication module drive, and the software stores the data locally through the data receiving and storage module; the software reads the data to build a model module. The contour model is modeled after processing.

As shown in Figure 2, a detection method for extracting rail profile curve by infrared laser irradiation includes the following steps:

Step 1, fix the laser profile sensor on the rail, the linear laser emitted by the laser profile sensor is parallel to the rail section, the horizontal distance between the laser profile sensor and the highest point of the rail is 30cm, and the height distance is 30cm, and the CCD camera is contrasted above the rail, The included angle in the vertical direction is 45 degrees, as shown in Figure 3-4;

Step 2, data collection and processing:

Step 2.1: The PC software sends the scan start command in the command issuing module to the laser profile sensor through the USB communication module driver. After the ARM-v7 chip receives the command, it controls the 650nm infrared laser and the CCD camera to start scanning, and the CCD camera transmits at this moment. The recorded picture is sent to the ARM-v7 chip, and the CCD camera outputs the speed transmission data of the contour data obtained from the current position 50 times every 1 second, until the PC software selects the stop option and sends the stop command to the laser contour sensor. stop scanning;

Step 2.2: The laser profile sensor scans a laser line on the rail. Due to the width of the laser line, the directly extracted profile line is actually a very narrow profile surface, so the ARM-v7 chip performs image binarization on the transmitted image. Processing, filtering and processing the data of multiple laser lines through the mathematical theory of the median theorem, and then the laser profile sensor is driven by the USB communication module to output the acquired data to the PC;

Step 3, the laser profile sensor measures the (Z, X) value of each point on the bright line, and the PC stores the data locally through the data receiving and storage module in the software;

Step 4, the software builds a model through data reading, processes the local data, and then models the contour model, converts the (Z, X) value of each point into the values of the x-axis and y-axis of the rail profile, and displays the rail on the screen. The standard outline of the rail head, its display diagram is shown in Figure 6.

Claims (6)

1. a detection system for extracting rail profile curve by infrared laser irradiation, is characterized in that, comprises hardware module and software module, and described hardware module comprises PC, by the embedding of CCD camera head and the infrared type laser of 650nm and ARM-v7 chip A laser profile sensor composed of a motherboard, the PC is connected with the laser profile sensor; The software module includes: a USB communication module driver, a command issuing module, a data receiving and storage module, and a data reading and building model module; The hardware module scans the contour of the rail to obtain initial contour data, and the software module processes and visualizes the contour data obtained by the PC. 2. the detection system of a kind of infrared laser irradiation extraction rail profile curve according to claim 1, is characterized in that, on the embedded motherboard of the ARM-v7 chip in the described laser profile sensor, the infrared type laser of 650nm is connected, The switch of the laser is controlled by the ARM-v7 chip; a CCD camera equipped with a 650nm filter is connected to the embedded motherboard of the ARM-v7 chip, and the ARM-v7 chip controls the CCD camera to collect images and process them to output data; PC The machine is connected with the laser profile sensor through the USB communication module driver. 3. the detection system of a kind of infrared laser irradiation extraction rail profile curve according to claim 1, is characterized in that, in the described software module, the software drives USB communication module to communicate with the laser profile sensor, and the software can pass this The communication sends commands to the laser profile sensor through the command issuing module; the laser profile sensor obtains data and transmits the data to the software through the USB communication module drive, and the software stores the data locally through the data receiving and storage module; the software builds the model module by reading the data. The local data is processed to model the contour model. 4 . The detection system for extracting rail profile curves by infrared laser irradiation according to claim 1 , wherein the hardware module can output the profile data obtained from the current position 50 times within 1 second to the software module. 5 . 5. a detection method for extracting rail profile curve by infrared laser irradiation, is characterized in that, comprises the following steps: Step 1, fix the laser profile sensor on the rail; Step 2, data collection: Step 2.1: The PC software sends the scan start command in the command issuing module to the laser profile sensor through the USB communication module driver. After the ARM-v7 chip receives the command, it controls the 650nm infrared laser and the CCD camera to start scanning, and the CCD camera transmits at this moment. The recorded picture is sent to the ARM-v7 chip, and the CCD camera outputs the speed transmission data of the contour data obtained from the current position 50 times every 1 second, until the PC software selects the stop option and sends the stop command to the laser contour sensor. stop scanning; Step 2.2: The laser profile sensor scans a laser line on the rail. Due to the width of the laser line, the directly extracted profile line is actually a very narrow profile surface, so the ARM-v7 chip performs image binarization on the transmitted image. Processing, filtering and processing the data of multiple laser lines through the mathematical theory of the median theorem, and then driving the laser contour sensor through the USB communication module to obtain an accurate contour line and output it to the PC; Step 3, the laser profile sensor measures the (Z, X) value of each point on the bright line, and the PC stores the data locally through the data receiving and storage module in the software; Step 4, the software builds a model through data reading, processes the local data, and then models the contour model, converts the (Z, X) value of each point into the values of the x-axis and y-axis of the rail profile, and displays the rail on the screen. Rail head standard profile. 6. A detection method for extracting rail profile curve by infrared laser irradiation according to claim 5, characterized in that in the step 1, the linear laser emitted by the laser profile sensor is parallel to the rail section, and the laser profile sensor is at the highest point of the rail. The horizontal distance is 30cm, the height distance is 30cm, and the CCD camera is placed above the rail, and the angle in the vertical direction is 45 degrees.

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