CN207197493U - A kind of laser ranging system - Google Patents

Abstract

A kind of laser ranging system, including laser, camera and shell are the utility model is related to, the laser is arranged in parallel in shell with camera, and the center of the laser and the centre distance of camera are 160~250 mm；The power outlet mouth connection computer and power supply of the laser and camera.The laser ranging system provided in above-mentioned technical proposal, it is simple in construction, it is easy to make, original dot laser light source is replaced using cross laser light source, so that the utility model has the advantages of target point is clear, collimation is good, precision is high, collect laser away from being integrated in one with laser measurement, realize a tractor serves several purposes, save the trouble that measurement acts on different machines with ranging.

Description

A laser distance measuring device

technical field

The utility model relates to the technical field of measurement, in particular to a laser distance measuring device.

Background technique

Laser ranging can achieve long-distance ranging with high measurement accuracy, and can achieve non-contact measurement without damage to the target to be measured. The triangulation laser distance measurement is to place the light source, the measured object and the image receiving system, that is, the image sensor, on three points respectively to form a triangular geometric structure; the triangulation laser distance measurement and measuring instrument uses a point light source for measurement. Point lasers have problems such as difficulty in focusing and finding, low recognition, and susceptibility to interference.

Utility model content

The purpose of this utility model is to provide a laser distance measuring device, which uses the original point laser light source of the cross laser light source bag body, which can make the target point clearer, with higher precision, easier to identify and observe, and at the same time realize one machine with multiple functions, save Go to the hassle of measuring and ranging acting on different machines.

In order to solve the above technical problems, the utility model adopts the following technical solutions:

A laser distance measuring device, comprising a laser, a camera and a casing, the laser and the camera are arranged in the casing in parallel, the distance between the center of the laser and the center of the camera is 160-250 mm; the exit line of the camera is connected to the computer Connect the outlet of the laser to the power supply.

Preferably, the housing is in the shape of a cuboid.

Preferably, the laser end of the laser and the camera end of the camera are respectively arranged on the front side of the cuboid casing.

Preferably, the laser direction of the laser is obliquely downward, and forms an included angle with the housing surface where the laser is located, and the included angle is 80-85°.

Preferably, a scale is also provided on the outside of the housing on the surface where the laser and the camera are arranged.

The laser ranging device provided in the above technical solution has a simple principle and is easy to manufacture, and can solve the problem of triangulation point laser ranging in the prior art, and a ruler is added on the basis of ranging to measure the distance in the picture. The measured distance is obtained by using the principle of similar triangles; the utility model integrates laser distance measurement and laser measurement, and realizes the integration of distance measurement and measurement.

Description of drawings

Fig. 1 is the structural representation of the utility model laser ranging device;

Figure 2 is a schematic diagram of the triangulation laser measurement;

Figure 3 is a schematic diagram of the laser ranging part.

Detailed ways

In order to make the purpose and advantages of the utility model clearer, the utility model will be described in detail below in conjunction with the embodiments. It should be understood that the following words are only used to describe one or several specific implementation modes of the utility model, and do not strictly limit the protection scope of the specific claims of the utility model.

The technical scheme adopted by the utility model is shown in Figure 1, a laser distance measuring device, including a laser 1, a camera 3 and a casing 4, the laser 1 and the camera 3 are arranged in the casing 4 in parallel, and the center of the laser 1 The distance from the center of the camera 3 is 160-250 mm; the outlet line of the camera 3 is connected to the computer, and the outlet of the laser 1 is connected to the power supply. The housing 4 is in the shape of a cuboid.

The utility model uses the MATLAB toolbox camera calibration to measure the focus to obtain the focal length, and then according to the distance x from the imaging point to one side of the picture and the distance between the center of the laser and the center point of the camera, the distance d from the laser to the object is obtained according to the trigonometric method. The measurement part is to obtain the distance between the upper and lower positions of the distance measurement center of the screen through the principle of similar triangles.

The laser end of the laser 1 and the camera end of the camera 3 are respectively arranged on the front side of the cuboid shell. The laser light direction of the laser 1 is obliquely downward, and forms an included angle with the shell surface where the laser is located, and the included angle is 80-85°.

During specific implementation, the above-mentioned included angle is 83°, and a scale 41 is also provided on the outside of the housing on the installation surface of the laser and the camera.

The measuring principle of the utility model is as follows:

Here, the principle of triangulation laser measurement is first explained. Figure 2 shows a schematic diagram of the distance d between the measurement object 2 and the laser 1. The line segment marked with s (the distance between the center of the laser and the center of the camera) is a plane that fixes the camera 3 and the laser 1. . The imaging plane of the camera is parallel to the fixed plane, and the angle between the ray emitted by the laser 1 and the plane is β, and the distance d is measured by first shooting the laser ray onto the measurement object 2, and its reflected light is imaged on the photosensitive plane of the camera , for objects of different distances, when the ranging laser is irradiated, the x value of the imaging light spot on the camera will change.

During the specific implementation, the values of these parameters are fixed and known after the distance measuring equipment is installed, then the distance between the measurement object 2 and the laser 1 is obtained by the following formula:

q=fs/x

d=q/sinβ

Among them, x is the only variable that needs to be obtained in the measurement, which is the distance from the image of the laser spot on the photosensitive element of the camera to the edge of one side of the object to be measured. The distance is obtained by searching and calculating the pixel coordinates of the center position of the laser point in the camera screen, and the vertical distance between the target object and the camera-laser plane is obtained.

The principle of similar triangles is applied in the laser measurement part, as shown in Figure 3, assuming that the distance of a certain point directly above the object is Y, and its length on the photosensitive CMOS sheet is multiplied by the pixel distance difference ∆y in Figure 3 by the size of the photosensitive unit pysize , so there is:

Y=∆y*pysize*q/f

In order to achieve the purpose of laser measurement.

The manufacturing process of the present utility model is as follows: first laser device, camera are installed on the shell, pay attention to keep the distance between camera head and laser device as s value when making, then camera head and laser device are packed, pay attention to the angle of laser device during installation, thereby Get this device.

Put the laser distance measuring device of the utility model on the horizontal platform, connect the laser to the power supply, connect the camera to the computer, then open MATLAB, open the program client, pour in the photos in the current direction acquired by the camera, click to confirm the intersection and measure Press the button to get the distance from the actual device to the intersection of the cross laser.

The embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings, but the present utility model is not limited to the above-mentioned embodiments. Under the premise of departing from the principle of the utility model, several equivalent transformations and substitutions can also be made, and these equivalent transformations and substitutions should also be regarded as belonging to the protection scope of the utility model.

Claims (5)

1. A laser distance measuring device, comprising a laser, a camera and a housing, characterized in that: the laser and the camera are arranged in parallel in the housing, and the distance between the center of the laser and the center of the camera is 160 to 250 mm; the camera The outlet line of the laser is connected to the computer, and the outlet of the laser is connected to the power supply. 2. The laser distance measuring device according to claim 1, characterized in that: the housing is in the shape of a cuboid. 3. The laser distance measuring device according to claim 1, characterized in that: the laser end of the laser and the camera end of the camera are respectively arranged on the front side of the cuboid casing. 4. The laser distance measuring device according to claim 1, characterized in that: the laser direction of the laser is obliquely downward, and forms an included angle with the shell surface where the laser is located, and the included angle is 80-85° . 5 . The laser distance measuring device according to claim 1 , characterized in that: a scale is also provided on the outside of the housing on the surface where the laser and the camera are installed. 6 .