CN2310325Y - Slope auxiliary time-measuring precision pulse laser speed-measuring instrument - Google Patents
Slope auxiliary time-measuring precision pulse laser speed-measuring instrument Download PDFInfo
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- CN2310325Y CN2310325Y CN 97221086 CN97221086U CN2310325Y CN 2310325 Y CN2310325 Y CN 2310325Y CN 97221086 CN97221086 CN 97221086 CN 97221086 U CN97221086 U CN 97221086U CN 2310325 Y CN2310325 Y CN 2310325Y
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Abstract
The utility model relates to a pulse laser speed measuring instrument used for measuring the speeds of moving bodies, which is composed of a distance measuring device, a miniature controller unit and a display unit, wherein the emission part of the distance measuring device transmits measuring light pulses and the receiving part of the distance measuring device respectively receives start pulses formed from measuring light pulses and end pulses formed from the reflection light of moving bodies. The miniature controller unit comprises a microprocessor, a counter, two oblique wave generators and an A/D converter and completes the transition measurement among time, voltage and digitals, wherein the counter is used for the main timing of the time between a start pulse to an end pulse and the two oblique wave generators realize auxiliary timing. The moving speeds of objects are calculated by the microprocessor. The utility model has the advantages of high speed measuring accuracy and simple structure.
Description
The utility model relates to a kind of surveying instrument, relates to a kind of pulse laser knotmeter of measuring moving object speed or rather.
Along with develop rapidly, the road traffic accident of highway construction and transportation are also increasing, existing China takes place surplus the traffic hazard 20 ten thousand every year on average, and people surplus the casualties 250,000 causes great loss and threat for the national wealth and the people's life security." ten times accident nine times fast " as everyone knows, driving over the speed limit is the main cause that causes driving accident.Therefore monitor vehicle travel speed and in time over-speed vehicles to be warned and prevented be the important traffic administration means of avoiding or reduce this type of traffic hazard.
At present, China vehicle supervision department adopts the microwave radar knotmeter that the speed of a motor vehicle is detected, this knotmeter has following several fatal defectives: the one, and the microwave angle of divergence reaches the 2-4 radian, when 500 meters of hypervelocity spacing speed measuring points, its diffusion can be up to 75 meters, therefore be difficult to exactly suspicious hypervelocity car be disclosed out, thereby lost the law enforcement foundation from Che Qunzhong; The 2nd, the radar velocity measurement system needs 2-3 second detection time, and Chang time provides the chance of slowing down for hypervelocity car driver like this, and the prosecution rate is descended; The 3rd, microwave radar is operated in the microwave section, and the people of long term exposure in the radar microwave radiation field suffers from serious diseases such as brain tumor easily, has therefore also limited promoting the use of of it.Radar meter has belonged to the row that are eliminated, is badly in need of replacing with a kind of new knotmeter.
The pulse laser knotmeter adopts semiconductor laser to launch a string near-infrared laser pulse, after the moving target reflection, the laser of retroeflection is received by photoelectric tube, by measurement and computing, can try to achieve moving target with respect to the distance of test point and the movement velocity of target to the time interval between the transponder pulse and burst transmissions time.
Suppose that the pulse laser knotmeter once only launches two measuring light pulses, the time interval between these two light pulses is fixed as Δ t0, two measuring light pulses are with the time interval of echo light pulse signal is respectively Δ t1 and Δ t2 accordingly, if c is the airborne light velocity, and consider that Δ t1 and Δ t2 are the time that the pulsed light round-trip transmission is spent, therefore:
By first measuring light pulse measured apart from S1=c Δ t1/2 ... (1)
By second measuring light pulse measured apart from S2=c Δ t2/2 ... (2)
The movement velocity of moving target is V=(S1-S2)/Δ t0 ... (3)
Because Δ t0 is the value of setting in advance, by (3) formula as can be known, the problem of testing the speed is actually the range finding problem, and therefore the precision that tests the speed also just depends on distance measuring precision.
When implementing pulsed laser ranging, be in the emission measurement light pulse, also to provide reference pulse (initial pulse), after shaping, open an electronic gate, at this moment the time clock of the clock oscillator that is connected with electronic gate enters counting circuit by electronic gate, begin to add up the time clock number when surveying, until the echo light pulse signal of reflection arrives (end pulse) close electronic gate and stop timing.Because oscillation frequency clock fo is known,, then can try to achieve the round-trip transmission time Δ ti=ni/fo of light pulse if the umber of pulse of record is Ni ... (4).
Obviously, because the time that timing stops also being not equal to the time that last count pulse arrives or finishes, therefore this counting precision by the clock pulse count range finding is 1 time clock, time period Δ T between for example last count pulse stops to timing is left in the basket and has disregarded, thus the measuring error of bringing.In other words, the measuring accuracy of step-by-step counting range finding is decided by a pairing period T of counting clock pulse, i.e. distance accuracy 2 Δ S=CT=c/f0 or fo=c/2 Δ S ... (5), as seen, in order to reach the distance accuracy of 15cm, fo=(3 * 10
10)/2 * 15=1GHZ promptly needs the counter with 1GHZ, and this requirement to counter and interlock circuit is higher, to implementing to bring difficulty.
The purpose of this utility model is that a kind of oblique wave of design is assisted accurate pulse laser knotmeter when surveying, when surveying by employing oblique wave auxiliary law, can reduce requirement greatly, improve when surveying simultaneously and distance measuring precision, the final precision that tests the speed that improves counter and interlock circuit.
The purpose of this utility model is achieved in that accurate pulse laser knotmeter when oblique wave is assisted survey, comprises distance measuring equipment, micro controller unit and display unit; Described distance measuring equipment comprises radiating portion of being made up of measuring impulse generator, generating laser and emission telescope optical system and the receiving unit of being made up of receiving optics, first, second photo-detector and initial pulse signal amplification and rectification circuit and end pulse signal amplification and rectification circuit; Described micro controller unit comprises microprocessor, counter and count pulse oscillator, it is characterized in that:
Described micro controller unit also includes control circuit, second ramp generator of first ramp generator, first ramp generator, the control circuit and the A/D converter of second ramp generator; The first ramp generator control circuit is connected between the control end of the described initial pulse signal amplification and rectification circuit output terminal and first ramp generator, and the control circuit of second ramp generator is connected between the control end of the described end pulse signal amplification and rectification circuit output terminal and second ramp generator; The output terminal of described first, second ramp generator connects two input channels of described A/D converter respectively, and A/D converter output connects described microprocessor; The counting of described counter allows to be connected with logic gates on the end, and two input ends of logic gates connect initial pulse signal amplification and rectification circuit output terminal respectively and finish pulse signal amplification and rectification circuit output terminal.
Described measuring impulse generator, generating laser are by PNP transistor U3, Mos field effect transistor U2, semiconductor pulse laser U1, resistance R 1, R2, the RLC pulse shaping circuit that electric capacity c1, inductance L 1 connect to form; The U3 emitter connects power supply, the U3 base stage connects described microprocessor, the U3 collector is connected with the grid of U2 and passes through resistance eutral grounding, the grounded drain of U2, the source electrode of U2 connects the U1 negative electrode, and the U1 anode connects R2 one end, another termination of R2 L1 one end, the L1 other end connects R1 one end and C1 one end, C1 other end ground connection, another termination power of R1.
Described initial pulse signal amplification and rectification circuit has and finishes the identical circuit structure of pulse signal amplification and rectification circuit, and the prime amplifier that is transformed into voltage signal by the current signal with first or second photo-detector connects and composes with carrying out shaping and exporting initial, as to finish pulse voltage comparator.
Described first ramp generator has the circuit structure identical with second ramp generator, is connected and composed by constant current source, charging capacitor and voltage amplifier.
The control circuit of described first ramp generator has the circuit structure identical with the control circuit of second ramp generator, is linked in sequence and is constituted by JK flip-flop, first d type flip flop, phase inverter, second d type flip flop, 3d flip-flop and traffic pilot, PNP transistor respectively; The output of two JK flip-flop also connects another input end of traffic pilot respectively, and the phase inverter input end in the control circuit of the inverter output in the control circuit of first ramp generator and second ramp generator also is connected two input ends of described counter logic gate circuit respectively.
Oblique wave of the present utility model is assisted accurate pulse laser knotmeter when surveying, utilize semiconductor laser to send the near-infrared laser pulse to moving target, utilize two photo-detectors to receive measuring light pulse and the light pulse after the moving target reflection respectively again, and form respectively for initial pulse of measuring and end pulse, utilize initial pulse and end pulse to open, close counter respectively, to clock pulse count, the positive integer counting clock pulse cycle doubly promptly constitutes the round values part of this period when surveying; In order to solve initial pulse and the asynchronous measuring error problem that causes that finishes pulse and time clock, the utility model also utilizes initial pulse simultaneously and finishes pulse and control two ramp generators respectively, the deadline-the voltage transitions measurement, and finish voltage-digital conversion by A/D converter and measure, measurement data constitutes initial pulse to finishing the fractional value part of pulse period when surveying through the microprocessor computing, and microprocessor also further calculates the speed of moving target and apart from the distance between test point.
Laser velocimeter of the present utility model, because the collimation of Laser emission has determined its angle of divergence to have only 3 milliradians, therefore Che Qunzhong measures the speed of suspect vehicle exactly from afar; Measuring Time only needs 0.3 second, makes furious driving person have little time to make the reaction of slowing down; Ray is harmless; The operating distance of knotmeter can reach 600 meters, and is higher 100 meters than radar meter.
Fig. 1, the utility model pulse laser knotmeter structural principle block diagram;
Fig. 2, the utility model oblique wave are assisted waveform synoptic diagram when surveying;
Fig. 3, oblique wave are assisted accurate pulse laser knotmeter circuit diagram when surveying;
Fig. 4, time interval Δ t calculated relationship figure;
Fig. 5, count pulse and corresponding triangular wave, sawtooth wave working waveform figure.
Referring to Fig. 1, pulse laser knotmeter is light, mechanical, electrical Trinitarian testing tool, is made up of range cells 11, micro controller unit 12 and display unit 13 3 big parts.
Range cells 11 comprises emission, receives the two large divisions, and radiating portion comprises pulse producer 111, generating laser 112 and emission telescope optical system 113.Laser instrument in the generating laser 112 sends the high narrow light pulse of peak light power, the exiting surface of laser instrument places the focal position of emission telescope optical system 113 camera lenses, because camera lens is about 25 ° to the angle of light source, therefore nearly all emission light all can be parallel light emergence via emission telescope optical system 113, for semiconductor laser, realize guaranteeing and to accomplish less than the output angle of divergence of 3 milliradians.Receiving unit comprises receiving optics 114, photo-detector 115 and signal amplification shaping circuit 116, and 117 is the sampler of generating laser 112 among the figure.Photo-detector 115 is arranged on the back focal plane of receiving optics 114 camera lenses.Photo-detector 115 comprises that same signal amplification shaping circuit 116 also comprises amplification and the shaping to both signals to the detection of target retroreflection light with to the detection of laser instrument sampling light, promptly obtains the initial pulse measured and finishes pulse.
The result that 12 pairs of range cells 11 of micro-control unit are surveyed handles, and obtains distance and the movement velocity of moving target apart from test point.Mainly comprise real-time analysis and counting circuit 121, microprocessor 122 and memory 123.Microprocessor is connected with counting circuit 121 with pulse producer 111, real-time analysis by logic control bus CB and data bus DB respectively.
Real-time analysis in the micro controller unit 12 and counting circuit 121 are key points of the utility model technology, its principle of work is please in conjunction with referring to Fig. 2, the enabling counting device is to clock pulse count when initial pulse arrives, close counter and start a ramp generator simultaneously when finishing the pulse arrival, this ramp generator cuts out by next time clock.As shown in Figure 2, the voltage of ramp generator rises to Vc by 0 in this section period Δ T.The voltage of supposing ramp generator in a count cycle T can rise to Vm from o, then
ΔT/T=(Vm-Vc)/Vm=Vo/Vm……(6)
And Δ T=nT+ Δ T ... (7) in the formula, the voltage of (t pass) ramp generator when V0 arrives for the end pulse of supposing, Δ t is the measuring light pulse round-trip transmission time, n be counter at initial pulse to finishing the total number of time clock that impulse duration is counted.Employing is the ratio that the analog to digital converter of reference voltage can record Vm-Vc/Vm with Vm, and the count cycle, T was known, the corresponding Δ T value of trying to achieve.
By (6) formula, (7) formula as can be known, adopt when oblique wave is auxiliary to be surveyed for improve when surveying, distance accuracy, and the effect that finally improves rate accuracy is conspicuous.For example, if getting Δ T precision is 1/50 of T, by aforementioned distance accuracy formula (5),
2 Δ S=C Δ T=0.02CT=0.02C/fo ... (8) as seen, in order to reach the distance accuracy of 15cm, fo=0.02C/2 Δ S=2 * 10
7HZ=20MHZ only requires the counter of 20MHZ, adopts therefore that the requirement to counter and interlock circuit thereof can correspondingly reduce when oblique wave is auxiliary to be surveyed.
Rate accuracy is relevant with distance accuracy, and higher distance accuracy has influenced rate accuracy and test duration.By aforementioned (3) formula Δ V=Δ S/ Δ to as can be known, establish the distance accuracy of knotmeter and bring up to 15cm, requiring rate accuracy is Δ V=± 1 kilometer/hour,
As seen Δ to=Δ S/ Δ V=0.27 second will guarantee ± 1 kilometer/hour rate accuracy that only need about 0.3 second test duration, obviously this rate accuracy and test duration are very suitable for the traffic knotmeter of practicality.
Referring to Fig. 3, measuring pulse is provided by microprocessor CPU, and transistor U3, MOS field effect transistor U2 and peripheral cell resistance R 1, capacitor C 1, inductance L 1 etc. connect to form the driving circuit of laser instrument U1, are pulse shaping circuits of being made up of RLC.Semiconductor pulse laser U1 sends is the burst pulse light of high-power, low jitter, fixed width, and C1 is an energy-storage travelling wave tube, and R1 is a charging resistor, and the duration of charging is determined by R1C1, and L1 is the lumped inductance of circuit, and R2 is a pull-up resistor, and U2 plays on-off action.C1 has been charged to V1 before the test, and CPU sends trigger pulse to trigger D0 (74) during test, triggers U3 and makes the U2 conducting through paraphase again, and C1 forms current impulse through L1, R2, U1, U2 discharge, and laser instrument U1 sends light pulse.
In optical receiving circuit, photo-detector U4 directly receives the light pulse signal of laser instrument U1 by sampler (directly coupling), is used to produce initial pulse, because the signal that receives is very strong, thereby can adopt the Pin detector.Photo-detector U5 receives the light that reflects from moving object, be used for producing finishing pulse since the signal that receives a little less than, thereby adopt APD detector (the two is high speed detector, and its rising, fall time are all less than 3ns).U4, U5 are output current signal after receiving light pulse signal, form voltage signal through high input impedance, broadband, the preposition amplification of low noise amplifier (SN5212) again, after voltage comparator (AD9696) shaping, generation have Transistor-Transistor Logic level initial, finish square-wave pulse signal, when sending into real-time analysis and counting circuit and surveying.
Real-time analysis and counting circuit comprise counter IC1, A-D converter IC2, count pulse generator IC3 (20MHZ), first ramp generator (transistor U7, U8, U9, operational amplifier IC4, capacitor C 2 etc.), second ramp generator (transistor U11, U12, U13, operational amplifier IC5, capacitor C 3 etc.), the first ramp generator control circuit (JK flip-flop DIA, d type flip flop D2A, D3A, D4A and traffic pilot IC6 etc.) and the second ramp generator control circuit (J-K flip flop D1B, d type flip flop D2B, D3B, D4B and traffic pilot IC7 etc.).The first ramp generator control circuit receives initial square-wave pulse signal, and output signal is controlled the work of first ramp generator; The second ramp generator control circuit receives and finishes square-wave pulse signal, and output signal is controlled the work of second ramp generator.
In conjunction with referring to Fig. 4, can calculate by three time periods to the time interval Δ t that finishes the pulse by initial pulse, its computing formula is Δ t=T2+ (T1-T3) ... (9) wherein T1 is the width of first pulse of first ramp generator control circuit generation, it is a starting point with the rising edge of initial pulse, time-delay after this and be terminal point with the rising edge of second time clock.T3 is the width of second pulse producing of the second ramp generator control circuit, and it is a starting point with the rising edge that finishes pulse, time-delay after this and be terminal point with the rising edge of second time clock.T2 therebetween is a time period, and the rising edge of its 1st time clock after with initial pulse is a starting point, is terminal point to finish postimpulse the 1st time clock rising edge.As seen, the numerical value of the integral part of Δ t when T2 is equivalent to be time of day with the clock-pulse width, the difference of T1 and T3 then is equivalent to the numerical value of Δ t fraction part, i.e. formula (9).
That is sent here by optical receiving circuit delivers to D1A and D1B J-K flip flop respectively with the nonsynchronous starting and ending pulse of counting clock, D1A, D1B output signal are directly delivered to 10,6 pin of traffic pilot D5A, D5B on the one hand, and therefore at output terminal 9, the 7 pin generation T1 of D5A, D6A, the rising edge of T3 pulse, after d type flip flop D2A, D3A, D4A, D2B, D3B, D4B time delay (2 times time clock), send 13,3 pin of traffic pilot D5A, D5B on the other hand again, thereby produce the negative edge of T1, T3 pulse.
T2 is obtained by counter IC1 direct census, and counter IC1 is 8 binary counters (74HC590).Initial, end square-wave pulse signal is sent through phase inverter with by D2B by D2A respectively, warp or door IC8 (74AC32) deliver to the CLKEN end of counter IC1, control signal as counting beginning and end, because the counting clock frequency is 20MHZ, thus the T2 numerical value of counter records be 50ns positive integer doubly.
T1 and T3 measure by first, second ramp generator and the mould \ A/D converter time of carrying out-digital conversion.They at first realize the conversion of time (pulse width)-voltage amplitude by slope circuit, and then the conversion of the process analog to digital conversion time of realizing-numeral.In Fig. 3 circuit, the conversion of time-voltage amplitude realizes by the constant-current charge to known capacitance C2, C3 respectively.For example, before IC6 output T1 pulse, the U6 conducting, capacitor C 2 is a zero potential, when the T1 pulse arrives, the rising edge of T1 opens circuit U6, so the constant current source of being made up of U7, U8, U9 charges U6 conducting when the negative edge of T1 arrives to C2, charging stops, capacitor C 2 powers on to press and is proportional to the pulse width that the duration of charging is T1, and this magnitude of voltage is after amplifier IC4 (TLC277) amplifies, and the 1st passage of sending into A/D converter IC2 (LTC1093) is converted to digital quantity.
In like manner, also can finish measurement, send the 2nd passage of A/D converter IC2 T3.
Microprocessor CPU receives T1, T2, T3 and presses formula (9) and calculate, and can try to achieve the Δ t value of actual measurement.Laser velocimeter time alignment moving object in 0.27 second at interval sends two measuring light pulses, records corresponding transmission time Δ t1 and Δ t2, and microprocessor utilizes formula (1), (2), (3) can calculate the movement velocity of object.
Referring to Fig. 5, when utilizing the survey that the auxiliary time study method of oblique wave can improve the pulse laser knotmeter, rate accuracy.As similar method, also can when reference pulse arrives, trigger a triangular-wave generator or saw-toothed wave generator etc., its waveform as shown in Figure 5, but their course of work complexity, and sawtooth wave also has many-valued problem, it is simple and easy to do to be not so good as the oblique wave method.
Claims (5)
1, a kind of oblique wave is assisted accurate pulse laser knotmeter when surveying, and comprises distance measuring equipment, micro controller unit and display unit; Described distance measuring equipment comprises radiating portion of being made up of measuring impulse generator, generating laser and emission telescope optical system and the receiving unit of being made up of receiving optics, first, second photo-detector and initial pulse signal amplification and rectification circuit and end pulse signal amplification and rectification circuit; Described micro controller unit comprises microprocessor, counter and count pulse oscillator, it is characterized in that:
Described micro controller unit also includes control circuit, second ramp generator of first ramp generator, first ramp generator, the control circuit and the A/D converter of second ramp generator; The first ramp generator control circuit is connected between the control end of the described initial pulse signal amplification and rectification circuit output terminal and first ramp generator, and the control circuit of second ramp generator is connected between the control end of the described end pulse signal amplification and rectification circuit output terminal and second ramp generator; The output terminal of described first, second ramp generator connects two input channels of described A/D converter respectively, and A/D converter output connects described microprocessor; The counting of described counter allows to be connected with logic gates on the end, and two input ends of logic gates connect initial pulse signal amplification and rectification circuit output terminal respectively and finish pulse signal amplification and rectification circuit output terminal.
2, oblique wave according to claim 1 is assisted accurate pulse laser knotmeter when surveying, it is characterized in that: described measuring impulse generator, generating laser are by PNP transistor U3, Mos field effect transistor U2, semiconductor pulse laser U1, resistance R 1, R2, the RLC pulse shaping circuit that capacitor C 1, inductance L 1 connect to form; The U3 emitter connects power supply, the U3 base stage connects described microprocessor, the U3 collector is connected with the grid of U2 and passes through resistance eutral grounding, the grounded drain of U2, the source electrode of U2 connects the U1 negative electrode, and the U1 anode connects R2 one end, another termination of R2 L1 one end, the L1 other end connects R1 one end and C1 one end, C1 other end ground connection, another termination power of R1.
3, oblique wave according to claim 1 is assisted accurate pulse laser knotmeter when surveying, it is characterized in that: described initial pulse signal amplification and rectification circuit has and finishes the identical circuit structure of pulse signal amplification and rectification circuit, and the prime amplifier that is transformed into voltage signal by the current signal with first or second photo-detector connects and composes with carrying out shaping and exporting initial, as to finish pulse voltage comparator.
4, oblique wave according to claim 1 is assisted accurate pulse laser knotmeter when surveying, it is characterized in that: described first ramp generator has the circuit structure identical with second ramp generator, is connected and composed by constant current source, charging capacitor and voltage amplifier.
5, oblique wave according to claim 1 is assisted accurate pulse laser knotmeter when surveying, it is characterized in that: the control circuit of described first ramp generator has the circuit structure identical with the control circuit of second ramp generator, is linked in sequence and is constituted by JK flip-flop, first d type flip flop, phase inverter, second d type flip flop, 3d flip-flop and traffic pilot, PNP transistor respectively; The output of two JK flip-flop also connects another input end of traffic pilot respectively, and the phase inverter input end in the control circuit of the inverter output in the control circuit of first ramp generator and second ramp generator also is connected two input ends of described counter logic gate circuit respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97221086 CN2310325Y (en) | 1997-07-09 | 1997-07-09 | Slope auxiliary time-measuring precision pulse laser speed-measuring instrument |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97221086 CN2310325Y (en) | 1997-07-09 | 1997-07-09 | Slope auxiliary time-measuring precision pulse laser speed-measuring instrument |
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| CN2310325Y true CN2310325Y (en) | 1999-03-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 97221086 Expired - Lifetime CN2310325Y (en) | 1997-07-09 | 1997-07-09 | Slope auxiliary time-measuring precision pulse laser speed-measuring instrument |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102116775A (en) * | 2010-01-05 | 2011-07-06 | 株式会社山武 | Velocity measuring device and method |
| CN102192707A (en) * | 2010-03-04 | 2011-09-21 | 株式会社山武 | Physical quantity transducer and physical quantity measuring method |
| CN102221631A (en) * | 2011-04-06 | 2011-10-19 | 金华市蓝海光电技术有限公司 | Laser speed measuring instrument and laser speed measuring method |
| CN102466801A (en) * | 2010-11-18 | 2012-05-23 | 付陆欣 | Handheld pulse laser distance measurer |
| CN102798865A (en) * | 2011-05-26 | 2012-11-28 | 付陆欣 | Pulse laser distance measurement method for parallel counting by multiple counters and handheld pulse laser distance measurer applying method |
| CN103308492A (en) * | 2013-06-13 | 2013-09-18 | 吉林大学 | Synchronous machine applied to laser-induced breakdown spectroscopy |
| CN104714046A (en) * | 2015-03-06 | 2015-06-17 | 周家军 | Speed measurement method and device adopting clock pulse counter |
| CN107576967A (en) * | 2016-07-05 | 2018-01-12 | 郑樯 | A kind of photosensitive constant current capacitance integral distance measuring sensor |
| CN110737189A (en) * | 2019-11-05 | 2020-01-31 | 中国电子科技集团公司第四十四研究所 | Pulse laser interval measuring circuit |
-
1997
- 1997-07-09 CN CN 97221086 patent/CN2310325Y/en not_active Expired - Lifetime
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102116775A (en) * | 2010-01-05 | 2011-07-06 | 株式会社山武 | Velocity measuring device and method |
| CN102116775B (en) * | 2010-01-05 | 2013-01-16 | 阿自倍尔株式会社 | Velocity measuring device and method |
| CN102192707A (en) * | 2010-03-04 | 2011-09-21 | 株式会社山武 | Physical quantity transducer and physical quantity measuring method |
| CN102466801A (en) * | 2010-11-18 | 2012-05-23 | 付陆欣 | Handheld pulse laser distance measurer |
| CN102221631A (en) * | 2011-04-06 | 2011-10-19 | 金华市蓝海光电技术有限公司 | Laser speed measuring instrument and laser speed measuring method |
| CN102221631B (en) * | 2011-04-06 | 2012-12-19 | 金华市蓝海光电技术有限公司 | Laser speed measuring instrument and laser speed measuring method |
| CN102798865A (en) * | 2011-05-26 | 2012-11-28 | 付陆欣 | Pulse laser distance measurement method for parallel counting by multiple counters and handheld pulse laser distance measurer applying method |
| CN103308492A (en) * | 2013-06-13 | 2013-09-18 | 吉林大学 | Synchronous machine applied to laser-induced breakdown spectroscopy |
| CN103308492B (en) * | 2013-06-13 | 2015-05-13 | 吉林大学 | Synchronous machine applied to laser-induced breakdown spectroscopy |
| CN104714046A (en) * | 2015-03-06 | 2015-06-17 | 周家军 | Speed measurement method and device adopting clock pulse counter |
| CN107576967A (en) * | 2016-07-05 | 2018-01-12 | 郑樯 | A kind of photosensitive constant current capacitance integral distance measuring sensor |
| CN110737189A (en) * | 2019-11-05 | 2020-01-31 | 中国电子科技集团公司第四十四研究所 | Pulse laser interval measuring circuit |
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