Laser velocimeter calibration device

Abstract

The utility model relates to the technical field of calibration instruments for laser velocimeters, and particularly discloses a calibration device for a laser velocimeter. Comprising a shell, a speed control module arranged in the shell, a time interval generator module arranged in the shell and electrically connected with the speed control module, a laser light source arranged at the end of the shell and electrically connected with the time interval generator module, and a support arranged at the bottom of the shell. The interval collection of the laser beams is generated by crossing the laser by an object, the collected speed values are different, and the required collection amount is large.

Description

Technical Field

[0001] The present application relates to the technical field of laser velocimeter calibration instruments, and specifically discloses a laser velocimeter calibration device. Background Art

[0002] Laser velocimeter is a device that measures the moving distance of the object under test within a certain time interval through laser emission and calculates the moving speed of the object. It adopts the principle of laser ranging, emits a laser beam through the object under test, receives the reflected wave of the laser beam, and records the time difference to determine the distance between the object under test and the test point.

[0003] For the verification or calibration device of the dual laser speed meter, single laser speed meter and U-type laser speed meter. Taking the dual laser speed meter as an example, the dual laser speed meter is an electronic device for measuring instantaneous speed. Its structure includes laser light source, laser receiver and speed display module. It is widely used in automobile safety collision test to monitor the instantaneous speed of the car before collision, or to test the instantaneous speed of the car when protecting pedestrians, or to measure a certain instantaneous speed.

[0004] Before using the laser rangefinder, the laser speedometer needs to be calibrated. The traditional method is to use a laser speedometer with higher accuracy to compare the calibrated laser speedometer. After the laser source and laser receiver of the calibrated laser speedometer are aligned, the light source and receiver of the standard laser speedometer are placed next to the light source and laser receiver of the calibrated laser speedometer. Use an object to pass through the laser to generate a speed value, and read the speed indication error between the measured laser speedometer and the standard laser speedometer.

[0005] The traditional method of calibrating a laser speed meter has the following disadvantages: during the test and calibration process, the interval acquisition of the laser beam is generated by an object passing through the laser, so the ideal speed value cannot be generated. Only repeated acquisition can produce a close value.

[0006] Therefore, in view of this, the inventor provides a laser speed meter calibration device to solve the above problems. Utility Model Content

[0007] The utility model aims to solve the problem that in the calibration of the traditional laser velocimeter, the interval collection of the laser beam is generated by the object passing through the laser, the collected speed values ​​are different, and the required collection amount is large.

[0008] In order to achieve the above-mentioned purpose, the basic scheme of the utility model provides a laser speed meter calibration device, including a shell, a speed control module arranged in the shell, a time interval generator module arranged in the shell and electrically connected to the speed control module, a laser light source arranged at the end of the shell and electrically connected to the time interval generator module, and a bracket arranged at the bottom of the shell.

[0009] Furthermore, two laser light sources electrically connected to the time interval generator modules are provided at the end of the shell.

[0010] Furthermore, a counterweight slot is formed through the shell, and a counterweight block can be placed in the counterweight slot.

[0011] Furthermore, the bracket includes a base arranged at the bottom of the shell, a rear end adjustment seat fixedly connected to the side of the base away from the laser light source, and a plurality of front end adjustment seats fixedly connected to the side of the base close to the laser light source.

[0012] Furthermore, a rear connecting plate is fixedly connected between the rear adjusting seat and the base, and a front connecting plate is fixedly connected between the front adjusting seat and the base.

[0013] Furthermore, the rear end connecting plate and the front end connecting plate are both arc-shaped plates.

[0014] Furthermore, the openings of the rear connecting plate and the front connecting plate are both facing upward.

[0015] Furthermore, the base includes a bottom connecting seat fixedly connected to the bottom of the shell and a bottom connecting platform rotatably connected to the bottom connecting seat and used to connect the rear end adjustment seat and the front end adjustment seat.

[0016] The principle and effect of this scheme are:

[0017] 1. Compared with the prior art, after the laser light source on the shell is aligned with the laser velocimeter to be calibrated, the utility model uses the speed control module to determine the output time interval of the time interval generator module, and generates a corresponding time interval electrical signal to enable the connected laser transmitter to generate a corresponding pulse light signal, so that it generates a stable and identical laser beam interval and speed to calibrate the laser velocimeter to be calibrated, which solves the problem of the calibration of traditional laser velocimeters, in which the interval collection of the laser beam is generated by the object passing through the laser, the collected speed values ​​are different, and the required collection amount is large.

[0018] 2. Compared with the prior art, the utility model is equipped with two laser light sources, which can cope with the calibration of dual laser velocimeters.

[0019] 3. Compared with the prior art, the utility model can increase the overall weight by adding counterweights, making the overall position more stable during the placement and calibration process.

[0020] 4. Compared with the prior art, the utility model is supported by a rear-end adjustment seat and a front-end adjustment seat, and the height of the laser emitter installed on the shell can be adjusted by the rear-end adjustment seat and the front-end adjustment seat, and the direction of the laser emitter can be adjusted in conjunction with the rotational connection relationship between the bottom connecting seat and the bottom connecting platform in the base. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 A schematic diagram of a laser velocimeter calibration device proposed in an embodiment of the present application is shown;

[0023] Figure 2 A side view of a laser velocimeter calibration device proposed in an embodiment of the present application is shown;

[0024] Figure 3 A schematic diagram of a laser velocimeter calibration device proposed in an embodiment of the present application is shown;

[0025] Figure 4 A schematic diagram of a laser velocimeter calibration device proposed in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0026] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0027] The reference numerals in the drawings of the specification include: housing 1, laser light source A2, front connecting plate 3, counterweight slot 4, rear end screw 5, inclined annular groove 6, end 7, front connecting plate 8, and calibrated dual laser velocimeter 9.

[0028] A laser velocimeter calibration device, for example Figure 1 As shown:

[0029] It comprises a shell 1, a bracket installed under the shell 1, a speed control module installed in the shell 1, a time interval generator module electrically connected to the speed control module, and a laser light source A2 electrically connected to the time interval generator module.

[0030] Specifically, the shell 1 is rectangular in shape as a whole, and a housing chamber for accommodating the speed control module and the time interval generator module is provided in the shell 1. Two lamp slots are provided at the front end of the shell 1 and are respectively connected to the housing chambers. A counterweight slot 4 is provided between the left and right side walls at the rear of the shell 1, and a counterweight block can be loaded through the counterweight slot 4 to increase the overall weight and stability. In this embodiment, two laser light sources A2 are provided, respectively named as laser light source A2 and laser light source B, and are respectively installed in corresponding lamp slots. Correspondingly, the time interval generator has an output port A corresponding to the laser light source A2 and an output port B corresponding to the laser light source B.

[0031] The bracket includes a base welded to the bottom of the housing 1, a rear end adjustment seat respectively installed on one side of the base, two front end adjustment seats installed on the other side of the base, a rear end connecting plate installed between the rear end adjustment seat and the base, and a front end connecting plate 8 installed between the front end adjustment seat and the base. In this embodiment, the overall height of the rear end adjustment seat and the front end adjustment seat is lower than the height of the base, and the rear end connecting plate and the front end connecting plate 8 are both arc-shaped plates used to connect the base with the rear end adjustment seat and the front end adjustment seat below, and the openings of the rear end connecting plate and the front end connecting plate 8 are both facing upward.

[0032] The rear-end adjustment seat and the front-end adjustment seat both include an adjustment top plate, an adjustment bottom plate, a connecting plate installed between the adjustment top plate and the adjustment bottom plate, and a screw installed through the adjustment top plate, the connecting plate and the adjustment bottom plate. The adjustment top plate, the connecting plate and the adjustment bottom plate of the rear-end adjustment seat and the front-end adjustment seat are coaxially provided with internal threaded holes for the screw to extend into and can be connected by threads. Among them, the connecting plate is a semicircular plate, and the internal threaded hole provided on the connecting plate is located at its axis. An end 7 is integrally formed at the top of the screw, and an inclined annular groove 6 is provided at the bottom end of the screw to facilitate the bottom end of the screw to be placed into the internal threaded hole. In this embodiment, the screw located in the rear-end adjustment seat is named the rear-end screw 5, and the screw located in the front-end adjustment seat is named the front-end screw; the connecting plate located in the rear-end adjustment seat is named the rear-end connecting plate, and the connecting plate located in the front-end adjustment seat is named the front-end connecting plate 3.

[0033] The base includes a bottom connecting seat fixedly mounted below the housing 1 and a bottom connecting platform mounted below the bottom connecting seat. A rotating hole is coaxially opened at the top of the bottom connecting platform, and a rotating platform is integrally formed below the bottom connecting seat, which extends into the rotating hole and can rotate inside. A shifting ring is welded to the outside of the rotating hole, and a plurality of continuous shifting grooves are opened on the outer wall of the shifting ring.

[0034] The rear connecting plate is installed between the bottom of the bottom connecting platform and the rear connecting plate, and the two front connecting plates 8 are respectively installed between the bottom of the bottom connecting platform and the corresponding front connecting plates 3.

[0035] When the utility model is used, taking the laser velocimeter to be calibrated as a dual laser velocimeter as an example:

[0036] First, the calibrated dual laser speed meter 9 is placed, and then the housing 1 of the calibration device is placed, and the rear adjustment seat and the two front adjustment seats form a triangular support to stably support the housing 1. After placement, the height and vertical inclination of the two light slots in front of the housing 1 can be controlled by adjusting the screwing depth of the rear screw 5 and the front screw to adapt to the height of the light source of the calibrated laser speed meter;

[0037] Then, the direction of the housing 1 in the plane can be adjusted by turning the dial ring to rotate the housing, so that the laser light source A2 and the laser light source B installed in the lamp slot of the housing 1 are respectively aligned with the laser receiver of the calibrated dual laser velocimeter 9;

[0038] After that, use a caliper to measure the distance between the laser emitter of the calibrated dual laser velocimeter 9 and the two light sources, and then input the measured distance value into the speed control module, and then input the speed value to be calibrated into the speed control module. The speed control module automatically calculates the required time interval according to the built-in existing algorithm, and transmits this time interval command to the time interval generator module to generate a corresponding time interval electrical signal, and the laser emitter connected to the time interval generator also generates a corresponding pulse light signal. At this time, the speed display value can be read on the calibrated dual laser velocimeter, and the speed input in the speed control module is used as the standard value. The corresponding indication error can be obtained by subtracting the standard value from the display value, and the calibration of the dual laser velocimeter can be completed.

[0039] Of course, when used in the calibration of other types of laser speed meters, it is only necessary to align any light source. The utility model combines the time interval generator with the laser and is equipped with a speed control module, which greatly improves the accuracy of calibrating the laser speed meter, saves the time of calibrating the laser speed meter, improves work efficiency, and fills the gap of no relevant calibration device in the field of laser speed meter calibration.

[0040] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A laser velocimeter calibration device, characterized in that: The invention comprises a shell, a speed control module arranged in the shell, a time interval generator module arranged in the shell and electrically connected to the speed control module, a laser light source arranged at the end of the shell and electrically connected to the time interval generator module, and a bracket arranged at the bottom of the shell.

2. A laser velocimeter calibration device according to claim 1, characterized in that: The end of the shell is provided with two laser light sources which are electrically connected to the time interval generator modules respectively.

3. A laser velocimeter calibration device according to claim 1, characterized in that: A counterweight slot is formed through the shell body, and a counterweight block can be placed in the counterweight slot.

4. A laser velocimeter calibration device according to claim 1, characterized in that: The bracket comprises a base arranged at the bottom of the shell, a rear end adjustment seat fixedly connected to the side of the base away from the laser light source, and a plurality of front end adjustment seats fixedly connected to the side of the base close to the laser light source.

5. A laser velocimeter calibration device according to claim 4, characterized in that: A rear connecting plate is fixedly connected between the rear end adjustment seat and the base, and a front connecting plate is fixedly connected between the front end adjustment seat and the base.

6. A laser velocimeter calibration device according to claim 5, characterized in that: The rear end connecting plate and the front end connecting plate are both arc-shaped plates.

7. A laser velocimeter calibration device according to claim 6, characterized in that: The openings of the rear connecting plate and the front connecting plate are both facing upward.

8. A laser velocimeter calibration device according to claim 4, characterized in that: The base comprises a bottom connecting seat fixedly connected to the bottom of the shell body and a bottom connecting platform rotatably connected to the bottom connecting seat and used for connecting the rear end adjusting seat and the front end adjusting seat.

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