TW201421059A - Laser velocimeter calibration system and method thereof - Google Patents

Abstract

The present invention discloses a laser velocimeter calibration system, which is characterized by directly using a laser velocimeter under test to perform testing, so as to perform velocimeter calibration by way of simulation. The system comprises: a velocity generation device having a rotation unit and a rotational speed control unit; and a time control device disposed to one end of the laser velocimeter opposite to the velocity generation device, so as to reflect a testing signal generated by the laser velocimeter. Rebound signals of different times are generated after being shielded by the rotation unit. After the laser velocimeter receives the rebound signals, the object of simulating an object speed can be achieved by means of comparing receiving times of the two signals, thereby achieving the efficiency of calibrating the laser velocimeter.

Description

Laser speedometer calibration system and method thereof

The invention relates to a laser speedometer calibration system and a method thereof, in particular to a system and method for directly testing the laser speedometer to be tested and using the simulation method to perform speedometer calibration.

The laser speed measurement can be roughly divided into Doppler speed measuring device, laser interference pattern or laser radar to test the object speed. The Doppler speed measuring device works by launching a laser to a moving object due to its scattering. The returning light source has a frequency difference from the original light beam, and the moving speed of the object is inferred by the difference in frequency. The laser interference pattern first generates interference fringes with a laser, and when the object passes through the stripe region, a laser fringe oscillation signal is generated to infer the speed at which the object moves.

When the laser speedometer is used for a period of time, it will also cause errors in the laser speedometer due to the difference in the laser frequency. Therefore, many correction methods are derived. Please refer to Figure 1, which is the mine of the national patent application number 091137989. The shooting speedometer calibration apparatus and method, as shown, is a rotating element 11 having one or more reflecting surfaces, and a rotation controller 12 controlling the rotational speed of the rotating element 11 to simulate the length and speed of a moving object. The simulated object speed can be determined by the parameters and the rotational speed of the rotating element 11 to be compared with the speed value measured by the laser speedometer 10 to achieve the corrected speed measured by the laser speedometer 10. Wherein, the rotating element 11 is a disc. And forming a plurality of fan-shaped mask faces on the disk, reflecting the laser beam through the mask surface, and achieving the purpose of speed conversion by rotating.

However, the above-mentioned laser speedometer calibration method uses a method in which the rotational displacement is converted into a parallel displacement to convert the object speed, but this method is easy to cause an error in the parallel displacement speed of the object due to the error of the angular velocity, so Accurately calculate the speed value of the laser speedometer.

In view of the above disadvantages of the prior art, the main object of the present invention is to provide a laser speedometer calibration system and a method thereof, which have a plurality of rotating units of holes and generate test signals with different times, thereby achieving the purpose of simulating the speed of the object, and further Achieve the power of the corrected laser speedometer.

In order to achieve the above object, the present invention provides a laser speedometer calibration system comprising a speed generating device having a rotating unit and a rotational speed control unit, and a time control disposed at the end of the speed generating device relative to the laser speed measuring device The device, wherein the rotating unit is a plate member having a plurality of holes for shielding a test signal generated by the laser speedometer, and when the rotating unit blocks the test signal, generating a first rebound signal, and penetrating the After the test signal of the rotating unit is reflected by the time control unit, a second bounce signal is generated. When the laser velociator receives the bounce signal, by comparing the receiving time of the two signals, the purpose of simulating the object speed is achieved, and the lightning correction is further achieved. The effectiveness of the speedometer.

The above summary and the following detailed description and drawings are intended to further illustrate the manner, means and effect. Other objects and advantages of the present invention will be described in the following description and drawings.

The embodiments of the present invention are described below by way of specific examples, and those skilled in the art can readily appreciate other advantages and functions of the present invention from the disclosure herein.

Please refer to FIG. 2 , which is a schematic diagram of a calibration system of a laser speedometer according to the present invention. As shown in the figure, the system includes: a rotation unit 211, a speed generating device 21 of a rotation speed control unit 212, and The speed control device 21 is opposite to the time control device 22 of the one end of the laser speedometer for reflecting the test signal generated by the laser speedometer, wherein the rotating unit 211 is a plate having a plurality of holes, The rotation unit 211 rotates to generate different shielding effects. The rotation speed control unit 212 is a motor. The rotation speed control unit 212 rotates to drive the rotation unit to simulate the function of simulating the test signals at different times. The time control device 22 is a The mirror can reflect the test signal passing through the hole, and can adjust the position according to the test requirement to achieve the purpose of controlling the signal time. When the test signal is blocked by the rotating unit 211, the first rebound signal is generated, and the signal is penetrated. The test signal of the rotating unit 211 is reflected by the time control unit 22 to generate a second bounce signal when the laser speed is measured. After the rally received two signals, the reception time by more than two signals, the purpose of the simulation speed of the object to further achieve the effect of correcting the laser gun.

Please refer to FIG. 3, which is a method for correcting the laser speedometer of the present invention. The flow chart is characterized in that the laser speedometer calibration method is characterized in that the laser speedometer to be tested is directly used for testing, and the speedometer calibration is performed by using an analog method, and the steps include: step 1 provides a rotating unit, and Speed generating unit S1; step 2 provides a time control device S2; step 3 generates different shading effects by rotating the rotating unit, and generates a rebound signal S3; and step 4 when the laser speedometer receives a rebound After the signal, by comparing the receiving time of the two signals, the purpose of simulating the speed of the object is achieved, and the function S4 of the laser speedometer is further improved.

The above-described embodiments are merely illustrative of the features and functions of the present invention, and are not intended to limit the scope of the technical scope of the present invention. Modifications and variations of the above-described embodiments can be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of protection of the present invention should be as set forth in the scope of the claims described below.

10‧‧‧Laser Speedometer

11‧‧‧Rotating components

12‧‧‧Rotary controller

21‧‧‧Speed generating device

22‧‧‧Time control device

211‧‧‧Rotating unit

212‧‧‧Speed Control Unit

Step procedure for S1~S4‧‧‧ laser speedometer calibration method

1 is a schematic diagram of a calibration device and method for a conventional laser speedometer; FIG. 2 is a schematic diagram of a calibration system of a laser speedometer according to the present invention; and FIG. 3 is a schematic flow chart of a method for correcting a laser speedometer according to the present invention. .

21‧‧‧Speed generating device

22‧‧‧Time control device

211‧‧‧Rotating unit

212‧‧‧Speed Control Unit

Claims (10)

A laser speedometer calibration system is characterized in that the laser speedometer to be tested is directly used for testing, and the speedometer calibration is performed by using an analog method. The system includes: a speed generating device, which is disposed at one end of the laser speedometer. Having a rotating unit and a rotating speed control unit; and a time control device disposed at the end of the speed generating device opposite to the laser speed measuring device for reflecting the test signal generated by the laser speed measuring device, and generating the high speed rotation by the rotating unit a different bounce effect, the test signal is blocked by the rotating unit to generate a first bounce signal, and the test signal penetrating the rotating unit is reflected by the time control unit to generate a second bounce signal, by comparing The receiving time of the two signals reaches the purpose of simulating the speed of the object, and further improves the efficiency of the laser speedometer. The laser speedometer calibration system of claim 1, wherein the rotating unit is a plate having a plurality of holes. The laser speedometer calibration system of claim 1, wherein the speed control unit is a motor. The laser speedometer calibration system of claim 1, wherein the time control device is a mirror. The laser speedometer calibration system of claim 1, wherein the time control device adjusts different positions according to the simulation speed. A laser speedometer calibration method is characterized in that the laser speedometer to be tested is directly used for testing, and the speedometer calibration is performed by using an analog method, and the steps thereof include: Providing a speed generating device having a rotating unit and a rotational speed control unit; providing a time control device; and locating the time control device to one end of the speed generating device relative to the laser speedometer for reflecting the laser speed measuring The test signal generated by the instrument is rotated by the rotating unit to generate different shielding effects. The test signal is shielded by the rotating unit to generate a first rebound signal, and the test signal penetrating the rotating unit is reflected by the time control unit. Then, a second bounce signal is generated, and the effect of simulating the velocity of the object is further achieved by comparing the receiving time of the two signals to achieve the purpose of simulating the speed of the object. The laser speedometer calibration method according to claim 6, wherein the rotating unit is a plate having a plurality of holes. The laser speedometer calibration method according to claim 6, wherein the speed control unit is a motor. The laser speedometer calibration method according to claim 6, wherein the time control device is a mirror. The laser speedometer calibration method according to claim 6, wherein the time control device can adjust different positions according to the simulation speed.