CN103295349A

CN103295349A - Highway alarm apparatus in rain and fog days

Info

Publication number: CN103295349A
Application number: CN2012100512354A
Authority: CN
Inventors: 彭涛; 刘小华
Original assignee: WTI (BEIJING) ASIA-PACIFIC PHOTOELECTRIC INSTRUMENT Co Ltd
Current assignee: WTI (BEIJING) ASIA-PACIFIC PHOTOELECTRIC INSTRUMENT Co Ltd
Priority date: 2012-03-01
Filing date: 2012-03-01
Publication date: 2013-09-11

Abstract

The invention discloses a highway alarm apparatus in rain and fog days, and relates to four parts of contents including a semiconductor laser, a light beam scanning mode, a scan driving circuit and a voice production device. The highway alarm apparatus in the rain and fog days aims at providing an audible and visual alarm, and preventing the accidents that vehicles collide isolation areas, rush out of fence netting, and are turned over from occurring, wherein the accidents are caused due to the fact that visibility in a highway is poor in a rain and fog day, and traveling speed is too fast in the position of a highway where a serial rear-ended accident happens and a sudden turning position of the highway. According to the highway alarm apparatus in the rain and fog days, an LD is used as a light resource and outputs high-intensity lasers with the small divergence angles. One part of light beams enter a cone scanning device, and three-dimensional scanning of space is achieved; the other part of the light beams enter a rotary regular polyhedron scanning device after being attenuated, and one-dimensional scanning of a front windshield of a rear vehicle is achieved. The scanning devices are controlled by the driving circuit. When alarm lasers are emitted, the voice production device is started to send out loud alarm. The highway alarm apparatus in the rain and fog days is used as the alarm apparatus for traffic accidents in the highway in the rain and fog days, and is also used as an attention device at the sudden-turning position of the highway.

Description

Expressway, misty rain sky alarm

Technical field

This patent relates to the traffic alarming device that is used as prevention traffic hazard on the misty rain sky highway, also can be used as the traffic alarming device of highway racing crook, misty rain sky.

Background technology

Visibility that misty rain causes reduces, makes the rear-end collision accident often to take place on the highway, owing to lack the accident alarming device, and the automobile generation pileup that causes the back to sail easily to come.In addition, owing to lack misty rain sky zig zag alarming device, often take place because of collision isolation strip that the speed of a motor vehicle of turning round causes too soon, go out accidents such as guardrail net, overturning.Therefore, expressway, misty rain sky alarm has great significance for the traffic hazard incidence, assurance driver's life security, the normal traffic order of maintenance that reduce on the misty rain sky highway.

At present, the misty rain sky requires the driver to open Auto Rear Fog Lamp at highway, and next automobile is sailed in the caution back.The light source of Rear Fog Lamp generally is light emitting diode (LED), it is to utilize the charge carrier spontaneous radiation recombination luminescence that is injected with the source region, so output power is less, the distance that causes the caution light that sends to be propagated in the misty rain sky is shorter, be generally about hundred meters under the sunny weather condition, the misty rain sky then shortens dramatically, the caution poor effect.Alarm used light source in expressway, this patent misty rain sky is semiconductor laser (LD), it is to utilize the stimulated radiation recombination luminescence, propagation distance can reach km at least under the general sunny weather condition, and the misty rain sky is compared propagation distance and improved an order of magnitude at least with LED, and LD has the following advantages:

(1) optical resonator is arranged, the amplification of in the chamber, vibrating of the photon of generation;

(2) angle of divergence of radiation laser beam is less, and output intensity and efficient are higher, and propagation distance is far away;

(3) response speed is very fast, can be used for higher modulation rate;

(4) spectrum is narrower, and the chromatic dispersion that propagation causes is little.

Though the light beam light intensity that LD sends is higher, propagation distance is far away, but the angle of divergence is less, cause caution to be limited in scope, therefore this patent design adds scanister, realize the spacescan of light beam, be beneficial to front vehicle driver's observation, avoid the long-time direct projection driver of strong beam eyes to cause the vision injury simultaneously.

Existing vehicle Rear Fog Lamp has only the light warning function not have voice guard, if send loud chimes of doom to long-distance large-range emission warning light beam the time then can provide a kind of warning message more for front vehicle.

Summary of the invention

Alarm concrete summary of the invention in expressway, this patent misty rain sky is as follows:

1) replace LED with LD, as the light source of expressway, misty rain sky alarm, utilize the vibration of photon in optical resonator to amplify, the very little high intensity laser beam of the output angle of divergence, in the very low misty rain sky of visibility, can long-distance communications;

2) choose the scan mode that conical scanning and the scanning of rotation regular polygon combine, the high-strength beam that LD is sent carries out 3-D scanning in the space, and carry out one-dimensional scanning on the front windshield of vehicle in the wings, make in the big field range away from the scene of the accident or zig zag, the driver can recognize that the place ahead traffic hazard has taken place or zig zag is arranged, and slows down and careful the driving;

3) adopt the direct current motor drive circuit of being made up of integrated circuit L293DD, electric capacity, the gated sweep mirror carries out space three-dimensional scanning;

4) adopt the direct current acoustical generator of being formed by hummer, triode, light emitting diode, resistance, electric capacity, in emission warning light beam, send loud chimes of doom, a kind of type of alarm is provided more.

Description of drawings

Fig. 1 is the structural representation of greasy weather expressway alarm;

Fig. 2 is for conical scanning and rotate the scan mode synoptic diagram that regular polygon scanning combines;

Fig. 3 is the direct current motor drive circuit synoptic diagram;

Fig. 4 is the sound-producing device synoptic diagram.

Embodiment

1. select the LD light source

The physical structure of LD is to settle one deck to have photoactive semiconductor between the knot of LED, and its end face has the part reflection function after polishing, thereby forms optical resonator.Under forward biased situation, LED binds up one's hair and penetrates light and interact with optical cavity, thereby further excitation is from tying the light of launching single wavelength, and the physical property of this light is relevant with material.The LD light source utilizes the vibration of photon in optical resonator to amplify, the output high intensity laser beam, and than traditional led light source, in the very low misty rain sky of visibility, propagation distance can exceed an order of magnitude.

At present, Auto Rear Fog Lamp use usually power as the LED of 16w and 21w as light source, single LEDs brightness is 800-3000cd/m ², be about hundred meters during the normal weather of illumination distances, the angle of divergence is about 30 °.In order to obtain small divergence angle, high-intensity laser beam, expressway, this patent misty rain sky alarm is chosen LD as light source.Consider the human eye characteristic, the selection operation wavelength is 620～660nm, and glow color is red LD, and the output continuous power is 80～100mw, and the angle of divergence is about 3 °, and illumination distances reaches km in the time of can guaranteeing normal weather like this.

2. the scan mode that adopts conical scanning and the scanning of rotation regular polygon to combine

The principle of rotation regular polygon scanning be with the regular polygon prism as catoptron, establish with rotating shaft along its axis, rotate by the driven by motor rotating shaft, make the regular polygon prism do uniform rotation.Rotation along with minute surface, its position is in continuous variation, and incident angle also constantly changes, and the direction of emission light beam also changes thereupon, suppose that rotating speed is ω, the minute surface number is n, because each minute surface all is identical, then every time of 360/ (n ω), minute surface will be got back to initial position, equally, the direction of folded light beam also will be got back to initial position, thereby be implemented in front vehicle front one-dimensional scanning on glass.This scan mode analyzing spot distributes more even, and the stability of equipment is better, because the number of faces of regular polygon is certain, the angle variation range of folded light beam is also just fixing, and common this mode is fit to wide-field scanning.

The principle of conical scanning be adopt one can be along the prism of rotating shaft rotation as catoptron, the direction of control reflection lasering beam.The normal direction of prism and turning axle a little angle β axially arranged, so minute surface and turning axle out of plumb, the angle of turning axle and vertical plane is 45 °.Laser beam shines on the mirror surface, through reflection directive space.Reflecting prism whenever rotates a circle, and the track of laser beam in the space just forms a cone, and the 3-D scanning of implementation space.The great advantage of this scan mode is that physical construction is simple, operates steadily, and is suitable for rotation at a high speed, is conducive to raise the efficiency.

The scan mode that expressway, this patent misty rain sky alarm adopts conical scanning and the scanning of rotation regular polygon to combine.During scanister work, the high-strength beam part that LD sends enters the conical scanning device through the spectroscope reflection, the 3-D scanning of implementation space, the reach of expansion expressway, misty rain sky alarm; Another part light beam that transmission is gone out enters rotation regular polygon scanister again behind another spectroscope reflection loss, be implemented in the one-dimensional scanning on the front vehicle front windshield, improve the caution efficient of expressway, misty rain sky alarm, avoid the long-time direct projection driver of strong beam eyes to cause the vision injury simultaneously.When misty rain sky visibility was 50-100m, the speed per hour that requires on the expressway to drive was no more than 40km/h, and following distance is more than 50m.Because bicycle road, expressway width 7.5m, the angle [alpha] that calculates conical scanning is 8.6 °, can realize by regulating the angle β of prism normal between axial with turning axle.Because the minute surface number of rotation regular polygon is 6, the one-dimensional scanning visual field of rotation regular polygon is 60 °, and calculating the one-dimensional scanning width is 57.7m, much larger than bicycle road, expressway width 7.5m, so the one-dimensional scanning width has covered expressway, whole bicycle road width.

3. adopt direct current motor drive circuit gated sweep mirror to scan

Expressway, this patent misty rain sky alarm adopts direct current motor drive circuit, and effectively the gated sweep mirror scans.For the one-dimensional scanning of rotation regular polygon, should finish once at least in the 1s, the minute surface number that rotates regular polygon again is 6, and then the time of rotating a circle is 6s, and rotating speed is 10rpm.Motor is selected the direct current generator of GA20Y130 model for use, and operating voltage is 12V, and working current is 42mA, and diameter 20mm, rotating speed are 10rpm.For conical scanning, for at the easier alarm laser of observing at a distance, the visual response time of considering human eye is that 40ms, misty rain are as the restriction of medium and the motor speed of laser light scattering, then finish 8 times conical scanning in the 1s at least, rotating speed is 500rpm, and motor is selected the GA20Y130 model equally for use.In the circuit for controlling motor, adopt integrated circuit L293DD as the driving chip of direct current generator, capacitor C 1 and C2 are connected between power supply and the ground.Input end IN1 and IN2, IN3 and IN4 are connected together respectively, by Single-chip Controlling.Output terminal connects two motors respectively, by giving the single-chip microcomputer loading routine, scans thereby control two scanning mirrors.

4. in emission warning light beam, open sound-producing device, send loud chimes of doom

Expressway, this patent misty rain sky alarm is furnished with the direct current acoustical generator, in emission warning light beam, sends loud chimes of doom, thereby a kind of type of alarm is provided more.Sound-producing device is made up of hummer, triode, light emitting diode, resistance and electric capacity, has working stability, long service life, characteristics such as low in energy consumption.During work, control signal starts sound-producing device, and hummer sends loud chimes of doom, and simultaneously, light emitting diode is lighted, and shows that sound-producing device is in duty.

Claims

1. expressway, misty rain sky alarm selects LD as light source, the very little high strength semiconductor laser of the output angle of divergence.A light beam part enters the conical scanning device, enters rotation regular polygon scanister after another part decay, implementation space scanning.Scanister is controlled by driving circuit.In emission warning light beam, open sound-producing device, send loud chimes of doom.

2. according to expressway, claim 1 described misty rain sky alarm, it is characterized in that comprising LD light source, beam flying mode, scan drive circuit and sound-producing device four partial contents.

3. according to the described light source of claim 1, it is characterized in that replacing traditional LED with LD.

4. scan the scan mode that combines according to the described conical scanning of claim 1 and rotation regular polygon, the 3-D scanning that it is characterized in that the conical scanning implementation space, enlarge the sweep limit of high-strength beam, the scanning of rotation regular polygon is implemented in the one-dimensional scanning on the front vehicle front windshield, improve caution efficient, avoid strong beam direct projection driver eyes to cause the vision injury simultaneously.