JPH0666941A - Apparatus for detecting speed of moving body - Google Patents

Abstract

PURPOSE:To detect the speed of a moving body which is moving in the arbitrary direction. CONSTITUTION:A moving body 1 moves in the direction indicated by a locus 2. A first laser oscillator part 12 emits first laser light 6, and a first light receiving part 14 receives the reflected light 7. By the same way, a second laser oscillator part 13 emits second laser light 7, and a second light receiving part 15 receives the reflected light 9. The optical-information analyzing part in a speed measuring instrument 11 analyzes the optical information from the light receiving parts 14 and 15. The speed operating part in a host computer 10 operates the speed of the body 1, which is moving in the arbitrary direction, based on the result of the analysis.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving object speed detecting device which can detect the speed of a moving object without contact.

[0002]

2. Description of the Related Art Conventionally, as a device for obtaining the moving speed of a moving object, it reflects radio waves at a constant angle with respect to the moving direction of the moving object, receives the reflected wave, and uses the Doppler effect to move the moving speed. There is something to ask for.

As another device, there is one that detects the time required for a moving object to pass a certain distance and divides the distance by the passing time to obtain the moving speed.

[0004]

However, in any of the above-mentioned conventional devices, detection is possible only when the moving direction of the object is a specific direction (for example, a direction vertical or parallel to the device). In the case of an object moving in an unspecified direction, speed detection is impossible.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a moving object speed detecting device capable of detecting the moving speed of an object moving in an arbitrary direction.

[0006]

As means for solving the above-mentioned problems, the present invention provides a first laser oscillating section for emitting a first laser beam in a direction intersecting a moving direction of a moving object, A second laser beam which is mounted at a position away from the mounting position of the first laser oscillation part by a predetermined distance and which emits a second laser beam whose emission direction is parallel to that of the first laser beam and which has a different wavelength.
A laser oscillating section, a first light receiving section for receiving reflected light of the first laser beam from the moving object, and a first light receiving section mounted at a position separated from the mounting position by a predetermined distance, A second light receiving section for receiving reflected light of the second laser light from the moving object; an optical information analyzing section for analyzing optical information obtained from the first and second light receiving sections; and the optical information. A speed calculation unit that calculates the moving speed of the moving object based on the analysis result of the analysis unit.

[0007]

In the above structure, when an object moves in an arbitrary direction, first laser light is emitted from the first laser oscillator section toward the moving object, and then second laser light is emitted. To be done. Then, the reflected light obtained by reflecting these laser lights on the moving object is received by the first and second light receiving portions, respectively.

The optical information analysis unit analyzes the optical information obtained from the first and second light receiving units and outputs the analysis result to the speed calculation unit. The speed calculator calculates the moving speed of the moving object based on the analysis result.

[0009]

Embodiments of the present invention will be described below with reference to FIGS. FIG. 2 is a block diagram showing the configuration of the moving body speed detecting apparatus according to this embodiment.

The detecting device shown in FIG. 2 is roughly divided into two parts, one is a speed measuring device 11 for irradiating a laser beam and receiving a reflected light, and the other is a measuring instruction for the speed measuring device 11. It is configured by the host computer 10 which calculates and calculates the speed from the measured data. The velocity measuring device 11 includes two laser emission units having different wavelengths, that is, first and second laser emission units 12 and 13, first and second light receiving units 14 and 15 whose bands are narrowed down to respective wavelengths, and light. Information analysis device 1
It consists of 6.

The host computer 10 is a central processing unit (CP).
U) 17, display device 18, keyboard 19, magnetic disk device 20, central processing unit 17 and speed measuring instrument 1
1, a CPU 17 has a speed calculator 23.
The speed measuring device 11 and the host computer 10 are connected by a communication cable 22.

When a measurement start instruction is given by input from the keyboard 19 or the like, a laser oscillation command is issued from the central processing unit 17 to the first and second laser emission units 12 and 13 via the input / output controller 21. Is transmitted, and the laser is emitted from each of the first and second laser oscillators 12 and 13. The optical information analysis unit 16 stores the initial state sent from the first and second light receiving units 14 and 15 after laser stabilization.

In the optical information analysis section 16, the first and second
The optical information sent from the second light receiving units 14 and 15 is received, the fluctuation of the peak wavelength in each laser light band is detected, and the time and the difference between the peak wavelengths before and after the fluctuation are detected. When a variation due to the same factor is detected from the first light receiving unit 14 and the second light receiving unit 15, the detection data is sent to the central processing unit 17 via the input / output controller 21. In the central processing unit 17, the speed calculation unit 23 calculates the speed based on the detection data, and the result is displayed on the display device 1.
8 is displayed and stored in the magnetic disk device 20.

FIG. 1 is a schematic diagram showing the measuring method of this embodiment. As shown in this figure, the host computer 10 and the speed measuring device 11 are connected by a communication cable 22,
The speed measuring device 11 includes the first and second laser oscillators 12,
13 and first and second light receiving portions 14 and 15 are provided. Here, the first and second laser beams 6 and 7 are irradiated in parallel, and the plane formed by the first and second laser beams 6 and 7 is parallel to the ground. In addition, the moving object 1 has its trajectory 2
When passing through the first and second laser beams 6 and 7, these reflected beams 8 and 9 appear. By receiving a part of the reflected lights 8 and 9 by the first and second light receiving units 14 and 15, the passage of the moving object 1 is recognized and the data of the reflected lights 8 and 9 is detected. A state in which the moving object 1 crosses the laser beams 6 and 7 is shown in FIGS.

FIG. 3 shows the time when the moving object 1 passes through the locus 2 and crosses the first laser beam 6 on the front side. At this point, the reflected light 8 is generated and received by the first light receiving unit 14. At this time, the reflected light 8 has a wavelength different from that of the laser light 6 due to the Doppler effect. Further, the directivity and the wavelength number band of the first light receiving unit 14 are optimized in accordance with the reflected light 8. Therefore, even if the reflected light 8 is diffused on the surface of the moving object 1, a part thereof is It can be detected by reaching the light receiving unit 14.

FIG. 4 shows the time when the moving object 1 crosses the second laser beam 7. Similarly to the above, the reflected light 9 is detected by the optimized second light receiving unit 15.

Here, as shown in FIG.
If the direction parallel to 7 is the x direction and the direction perpendicular to the laser beams 6 and 7 is the y direction, the velocity x component 4 of the moving object 1 is calculated from the wavelength difference between the laser beams 6 and 7 and the reflected beams 8 and 9. The velocity y component 5 is obtained from the time difference between the reflected light 8 and the reflected light 9 and the distance between the laser lights 6 and 7.

Therefore, the velocity 3 of the moving object 1 is the velocity x
It can be obtained by vector composition (or the Pythagorean theorem) of the component 4 and the velocity y component 5. As a result, the velocity can be measured without contact regardless of the moving direction of the moving object 1, and the moving direction can also be measured.

In the above embodiment, the velocity x component of the moving object 1 is obtained by utilizing the Doppler effect, but it can be obtained by the pulse phase difference or the pulse number difference by using laser light as a pulse wave. . That is, as shown in FIG. 6, considering the case where the moving object 1 moves from the point A to the point B, the speed between the AC is the first laser light and its reflected light 8 and the second laser light 7. And the pulse number difference from the reflected light 9 can be obtained. Further, the speed between BCs can be obtained from the time difference between the reflected lights 8 and 9 as in the above embodiment.

When the velocity is obtained by using the Doppler effect, it is essentially sufficient to emit only one laser beam for the velocity x component. Therefore, the actual speed x
In obtaining the component, the first and second laser beams 6,
The average speed of the speeds obtained by using any one of 7 or both may be used as the speed x component to be obtained.

[0021]

As described above, according to the present invention, two sets of the laser oscillating section and the light receiving section are provided, and the speed of the moving object is calculated based on the analysis result of the optical information obtained therefrom. It is possible to detect the speed of a moving object that moves in an arbitrary direction.

[Brief description of drawings]

FIG. 1 is a schematic diagram for explaining speed measurement according to an embodiment of the present invention.

FIG. 2 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 3 is a schematic diagram for explaining a part of the speed measurement in FIG.

FIG. 4 is a schematic diagram for explaining a part of the speed measurement in FIG.

FIG. 5 is a velocity component combination diagram when the velocity of a moving object is obtained by combining the x component and the y component.

FIG. 6 is an explanatory diagram of speed measurement according to another embodiment.

[Explanation of symbols]

 1 Moving Object 6 First Laser Light 7 Second Laser Light 12 First Laser Oscillator 13 Second Laser Oscillator 14 First Light Receiver 15 Second Light Receiver 16 Optical Information Analyzer 23 Velocity Calculator

Claims (1)

[Claims] 1. A first device in a direction intersecting a moving direction of a moving object.
And a first laser oscillator that emits the laser beam, and the first laser oscillator is mounted at a position separated by a predetermined distance from the mounting position of the first laser oscillator, and the emission direction is parallel to the first laser beam and the wavelength is different. A second laser oscillator that emits a second laser light, a first light receiver that receives the reflected light of the first laser light from the moving object, and a predetermined position from the mounting position of the first light receiver. A second light receiving portion, which is attached at a position separated by a distance, receives the reflected light of the second laser light from the moving object, and analyzes light information obtained from the first and second light receiving portions. A moving object velocity detecting device comprising: an optical information analyzing unit; and a velocity calculating unit that calculates a moving velocity of the moving object based on an analysis result of the optical information analyzing unit.