CN203038469U - Automobile speed-measurement and detection-calibrating apparatus adopting opposite laser switch - Google Patents
Automobile speed-measurement and detection-calibrating apparatus adopting opposite laser switch Download PDFInfo
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- CN203038469U CN203038469U CN 201220691664 CN201220691664U CN203038469U CN 203038469 U CN203038469 U CN 203038469U CN 201220691664 CN201220691664 CN 201220691664 CN 201220691664 U CN201220691664 U CN 201220691664U CN 203038469 U CN203038469 U CN 203038469U
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Abstract
An automobile speed-measurement and detection-calibrating apparatus adopting opposite laser switches comprises three full-station type electronic tachometers with the laser switches, two counters, a snapshot unit and an industrial control computer, wherein the three full-station type electronic tachometers are linearly arranged. Laser-switch receiving terminals are respectively mounted on opposite sides of the tachometers to form three pairs of laser switches having laser emission and receiving functions. Optical axes of every pair of emission terminal and receiving terminal are aligned and fixed one by one. The snapshot unit consists of two cameras. One of the cameras is mounted on one end of the arrangement straight line of the three full-station type electronic tachometers. A lens is forward the arrangement straight line. The other camera is disposed on a position vertical with the arrangement straight line of the three full-station type electronic tachometers. A lens faces the arrangement straight line.
Description
Technical field
The utility model relates to the measuring vehicle speed technical field; Particularly employing has the length of optical laying and measurement and positioning function apart from the measuring vehicle speed and detection calibrating installation of correlation laser switch based on rice method second.
Background technology
Along with the fast development of China's economic society, the stream of people, wagon flow, logistics grow with each passing day, and road traffic accident is high.Therefore, magnitude of traffic flow control and car speed restriction have become the important content of China's traffic monitoring real-time monitoring system.Magnitude of traffic flow control and car speed restriction need to detect in real time the speed of a motor vehicle, and the measurement and calibration and the magnitude tracing that detect the speed of a motor vehicle in real time need the accurate vehicle speed measurement instrument of a cover.
Present vehicle speed measurement instrument mainly contains infrared detection technology, ultrasonic detecting technology, ground induction coil detection technique, radar detection technique, video frequency speed-measuring disposal system, gps satellite sequenator etc.Yet, do not have a kind of accurate and unified truing tool for these vehicle surveying instruments.Because the laser switch measuring accuracy is higher relatively, far measuring distance, the reaction time is rapid, makes it can be used as the truing tool of above-mentioned vehicle speed measurement instrument.But operation relative complex when it is measured, the planar transmit laser of the vehicle opposed flattened that need aim at the mark, these advantages that laser switch is measured
The laser switch knotmeter that is used for measuring vehicle speed mainly is made up of Laser emission end, laser pick-off end, time base circuit, computer control system at present.Mainly contain two kinds of speed measuring devices: a kind of is with each three of LASER Light Source and photodetectors, be positioned over the road both sides at interval, LASER Light Source is sent laser by the photodetector reception on opposite, when having automobile to pass through in the road, successively block the laser that sends from LASER Light Source three times, make photodetector not receive laser, namely transmit a signal to time base circuit, and then definite automobile blocks the time interval of laser for three times, in conjunction with the spacing distance between two photodetectors, can calculate automobile by the average velocity in this highway section; I.e. so-called rice second method.As being to solve in the horizontal adjustment problem of the instrument of road one side and the parallel problem of three beams of laser bundle as requiring correcting device accurately, its shortcoming; In installation process also not accurately instrument simplify installation, make the installation process difficulty high and very complicated, the error in the installation process does not have special instrument that it is calculated yet.
The another kind mode that tests the speed is improved first kind, and three LASER Light Source and three receiving traps are placed on the same side of road, places catoptron at the road opposite side.Though second method is improved first method, make things convenient for the light path of Laser emission and receiving trap to adjust problem, but do not had solution in the horizontal adjustment problem of the instrument (between the Laser emission end, between the laser pick-off end) of road the same side and the parallel problem of three beams of laser bundle; In installation process also not accurately instrument simplify installation, the technical difficulty in the installation process and complicacy do not reduce and simplify, the error in the installation process does not have special instrument that it is calculated yet.And owing to be to adopt reflective reception, its time of reception doubles than correlation in principle, has influenced its measuring accuracy.
Summary of the invention
The purpose of this utility model is to lack accurately the reasonably present situation of field test calibration instrument at present car speed detecting device, provide a kind of length with optical laying and measurement and positioning function based on rice method second apart from the measuring vehicle speed of correlation laser switch and detect calibrating installation, realize the field test calibration to wagon detector.
Adopt the measuring vehicle speed and detection calibrating installation of correlation laser switch, comprise that 3 have the full site type electronic tachometer of laser switch, two counters, candid photograph unit and industrial computers; Wherein, 3 full site type electronic tachometers (including three Laser emission end S1, S2, S3) line spread, its opposite arranges laser switch receiving end R1, R2, R3 respectively, form three pairs of laser switches with Laser emission and reception, and the optical axis of the every pair of transmitting terminal and receiving end secured in alignment one by one; Described candid photograph unit is made up of two cameras, wherein a camera is located at the end that 3 full site type electronic tachometers are arranged straight line, camera lens is forward arranged straight line, another camera is located at the upright position that 3 full site type electronic tachometers are arranged straight line, camera lens is towards arranging straight line, described laser pick-off end R1 respectively with counter 103(one), camera 104(one) be connected; Laser pick-off end R2 respectively with counter 103(two) and camera 104(two) be connected; Laser pick-off end R3 respectively with counter 103(one), counter 103(two), camera 104(one), camera 104(two) be connected; Described counter A103(one), camera 104(two camera 104(one counter 103(two))) be connected with industrial computer 105 respectively.
Principle of work:
Adopt three full site type electronic tachometers with laser switch function to finish reaching distance and the measurement of angle of laser instrument transmitting terminal and receiving end between 3 groups of laser instruments, with its distance with angle calculation is come out and will be transferred to industrial computer, automobile sends counter to by the pulse electrical signal of three groups of laser switches by the intrinsic range finding of full site type electronic tachometer and angle measurement function; Counter catches the pulse electrical signal that is sent by the laser instrument receiving end and is translated into instant data passes to industrial computer; Programming module by industrial computer calculates speed; Laser pick-off end R1 control camera 104(one) automotive license plate is captured laser pick-off end R3 control camera 104(two) automobile side is captured, and send the photo of capturing to industrial computer; Described industrial computer is finished the instant data that counter is sent and is carried out the data processing, receives the photo that camera sends, and above-mentioned measurement data and picture are shown.
Advantage of the present utility model and good effect: full site type electronic tachometer is applied to the field of testing the speed.Not only make things convenient for installation and the adjustment of laser switch, and overcome the shortcoming that traditional laser correlation speed-measuring method is installed difficulty.Make that the laser of laser instrument emission is coaxial with full site type electronic tachometer, the Laser emission distance can reach (2-500) m, range finding that can be by full site type electronic tachometer self and angle measurement function obtain measuring distance and the angle between the laser instrument, calculate by the program in the industrial computer again because the range rate error that Uneven road causes, thereby improved the precision of laser switch, dwindled laser switch self because the error that data produce in the error that causes in the installation process and the process that tests the speed.(classic method does not have basis to the error of this respect).Because the frequency of its laser pulse can reach 5--15MHz, can ignore the error that laser switch causes the result that tests the speed.Just because of above-mentioned reason, the automobile speed that adopts this apparatus measures to obtain, degree of accuracy height, error is little, can be used for other wagon detectors of check calibrating, therefore, at vehicle speed measurement and aspect the detection calibration of other wagon detectors, be of great immediate significance.This patent provide based on the measuring vehicle speed method of the laser switch of rice method second and detect calibrating installation and then can overcome it and difficulty is installed, measures complicated shortcoming.
Description of drawings
Fig. 1 is the utility model application state structural representation.
Embodiment
As shown in Figure 1, adopt the measuring vehicle speed and detection calibrating installation of correlation laser switch, comprise 3 full site type electronic tachometers that have a laser switch (its laser emitting source and full site type electronic tachometer light shaft coaxle can carry out high-accuracy optical and aim at), two counters, capture unit, industrial computer; With 3 full site type electronic tachometers (including three Laser emission end S1, S2, S3) line spread, its opposite arranges laser switch receiving end R1 respectively, R2, R3 form three pairs of laser switches with Laser emission and reception, the Laser emission end to the distance of laser switch receiving end preferred 20 meters of 5 meters ~ 50() rice, and the optical axis of the every pair of transmitting terminal and receiving end secured in alignment one by one; Described candid photograph unit is made up of two cameras, and dead ahead, another camera that camera is placed on road are placed on the road side, finishes candid photograph to automotive license plate and doughnut respectively when receiving pulse electrical signal that the laser pick-off end sends; Wherein laser pick-off end R1 respectively with counter 103(one), camera 104(one) be connected; Laser pick-off end R2 respectively with counter 103(two) and camera 104(two) be connected; Laser pick-off end R3 respectively with counter 103(one), counter 103(two), camera 104(one), camera 104(two) be connected; Described counter A103(one), camera 104(two camera 104(one counter 103(two))) be connected with industrial computer 105 respectively.
Angle measurement and the distance measurement function intrinsic by full site type electronic tachometer aim at receiving target, open laser instrument, send continuous impulse by laser instrument, as object by the time can trigger laser switch, produce pulse electrical signal, utilize receiving end to receive laser signal and also changed, by angle measurement and distance measurement function that full site type electronic tachometer is intrinsic experimental result is calibrated and compensated, improve the precision that car speed is measured, reduced error.
The transmission frequency of described laser switch is 5--15MHz.
The resolving power of described counter is 20ns.(nanosecond)
The CPU of described industrial computer is the X86 compatibility, and windows operating system is installed, and as host computer, is used for carrying out data and receives, handles, shows and storage.
Laser switch receiving end: be used for receiving the pulse laser of transmitting terminal, and control two cameras and respectively automotive license plate and automobile survey face are captured.
Counter 103: be used for receiving the pulse electrical signal between the full site type electronic tachometer laser instrument, calculate automobile by the time interval of laser switch.
Camera 104:: receive the pulse electrical signal that full site type electronic tachometer laser instrument receiving end sends, finish the candid photograph to license plate and automobile side.
Industrial computer 105: be used for time data that the count pick up device the transmits line data of going forward side by side and handle and receive the auto graph that camera sends, and finish that data show and storage.
Principle of work and the course of work are as follows:
The distance measurement function of the full site type electronic tachometer self by band Laser emission function is placed a full site type electronic tachometer that has laser switch transmitter 101 in highway one side every 5m.Place three same quasi-instruments altogether, the generating laser that the inside carries is followed successively by S1, S2, S3, the angle measurement function by full site type electronic tachometer makes S1, S2, S3 point-blank, angle each other is 180 degree, and is parallel to highway.
1. locate by the distance measurement function of full site type electronic tachometer self, opposite side at highway is placed one group of laser switch receiver 102 every 5m, place three altogether, be followed successively by R1, R2, R3 is used for receiving the laser that full site type electronic tachometer laser switch transmitter is launched.
2. utilize the angle measurement function of full site type electronic tachometer self to make S1, S2, S3 revolve successively to turn 90 degrees and make three laser beam perpendicular to the automobilism direction, and receiving end can receive the laser that transmitting terminal sends.
3. when automobile passes through laser switch receiving end R1, R1 can send pulse electrical signal and give counter 103(one), counter 103(two) picks up counting, R1 sends pulse electrical signal control camera 104(one simultaneously) automotive license plate is captured, when automobile passes through R3, R3 sends pulse electrical signal and gives counter 103(one), counter 103(two) timing finishes, R3 sends pulse electrical signal control camera 104(two) automobile side is captured and photo with obtain automobile by the time interval between R1 and the R3, and the time interval is sent to industrial computer.
4. when automobile passes through laser switch receiving end R2, R2 can send pulse electrical signal and give counter 103 (two), counter 103(two) picks up counting, when automobile passes through R3, R3 sends pulse electrical signal and gives counter 103 (two), counter 103(two) timing finishes, and obtains automobile by the time interval between R2 and the R3, and the time interval is sent to industrial computer.R3 sends pulse electrical signal simultaneously, control camera 104(two) automobile side is captured, and photo is sent to industrial computer.
6. industrial computer receives automobile by the time interval of R1 and R3, because the distance between R1 and the R3 is S
1,Can calculate the travel speed v of automobile between R1 and R3
1.; Receive automobile by the time interval of R2 and R3, because the distance between R2 and the R3 is S
2, can calculate the travel speed v of automobile between R1 and R3
2.; By v
1With v
2Can obtain the variation a=v of car speed
1-v
2A kilometer/hour car speed that measures is effective value when a＜0.4.Industrial computer shows the vehicle speed data that measures and the auto graph that has camera 104 to photograph and storage.
In sum, the full site type electronic tachometer of this optical instrument of laser switch and engineering survey use is configured to one, not only made things convenient for the operation of full site type electronic tachometer, make the measurement of full site type electronic tachometer more convenient, improved the precision of the laser switch made from the optical alignment principle more, in the process of using laser switch, reduced the error of laser switch self and various errors extraneous in the laser switch process have been installed, improved the precision of laser switch, the measured automobiles speed of a motor vehicle accurately not only, main is that other speed measuring devices are carried out calibrating and measuring, saving manpower, fast, there is major and immediate significance the efficient detection speed of a motor vehicle and speed measuring device aspect, and the full site type electronic tachometer laser switch of developing in the native system is being measured, also there is very big reference in the field of the full site type electronic tachometers of use such as building.
The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (4)
1. adopt the measuring vehicle speed and detection calibrating installation of correlation laser switch, it is characterized in that, comprise that 3 have the full site type electronic tachometer of laser switch, two counters, candid photograph unit and industrial computers; Wherein, 3 full site type electronic tachometer line spread, its opposite arranges laser switch receiving end R1, R2, R3 respectively, forms three pairs of laser switches with Laser emission and reception, and the optical axis of the every pair of transmitting terminal and receiving end secured in alignment one by one; Described candid photograph unit is made up of two cameras, wherein a camera is located at the end that 3 full site type electronic tachometers are arranged straight line, camera lens is forward arranged straight line, another camera is located at the upright position that 3 full site type electronic tachometers are arranged straight line, camera lens is towards arranging straight line, and described laser pick-off end R1 is connected with counter one, camera one respectively; Laser pick-off end R2 is connected with counter two and camera two respectively; Laser pick-off end R3 is connected with counter one, counter two, camera one, camera two respectively; Described counter one, counter two, camera one, camera two are connected with industrial computer respectively.
2. the measuring vehicle speed of employing correlation laser switch according to claim 1 and detection calibrating installation is characterized in that the transmission frequency of described laser switch is 5--15MHz.
3. the measuring vehicle speed of employing correlation laser switch according to claim 1 and detection calibrating installation is characterized in that the resolving power of described counter is 20ns.
4. the measuring vehicle speed of employing correlation laser switch according to claim 1 and detection calibrating installation is characterized in that the CPU of described industrial computer is the X86 compatibility, and windows operating system is installed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220691664 CN203038469U (en) | 2012-12-14 | 2012-12-14 | Automobile speed-measurement and detection-calibrating apparatus adopting opposite laser switch |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220691664 CN203038469U (en) | 2012-12-14 | 2012-12-14 | Automobile speed-measurement and detection-calibrating apparatus adopting opposite laser switch |
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| CN203038469U true CN203038469U (en) | 2013-07-03 |
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| CN 201220691664 Expired - Lifetime CN203038469U (en) | 2012-12-14 | 2012-12-14 | Automobile speed-measurement and detection-calibrating apparatus adopting opposite laser switch |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111122906A (en) * | 2019-12-05 | 2020-05-08 | 安徽皖仪科技股份有限公司 | Calibration method for three-point laser type light-cutting speed and acceleration tester |
-
2012
- 2012-12-14 CN CN 201220691664 patent/CN203038469U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111122906A (en) * | 2019-12-05 | 2020-05-08 | 安徽皖仪科技股份有限公司 | Calibration method for three-point laser type light-cutting speed and acceleration tester |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130703 |