CN204989471U - Multiple target pulsed laser distancer - Google Patents
Multiple target pulsed laser distancer Download PDFInfo
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- CN204989471U CN204989471U CN201520764242.8U CN201520764242U CN204989471U CN 204989471 U CN204989471 U CN 204989471U CN 201520764242 U CN201520764242 U CN 201520764242U CN 204989471 U CN204989471 U CN 204989471U
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Abstract
The utility model discloses a multiple target pulsed laser distancer, including trigger button, calculation and control module, laser transmitting module, prism optical module, photoelectric conversion and signal shaping module, range display module, operation button, calculation and control module are connected with trigger button, laser transmitting module, photoelectric conversion and signal shaping module, range display module, operation button one -to -one respectively, prism optical module cooperates with laser transmitting module, photoelectric conversion and signal shaping module one -to -one respectively. The utility model discloses a laser rangefinder process, can obtain the multiple targets on the laser emission route, reduce the electric energy of laser rangefinder appearance and improved range finding efficiency.
Description
Technical field
The utility model relates to the technical field of distance mearuring equipment, refers in particular to a kind of multiple goal pulse laser laser welder.
Background technology
Pulse laser laser welder in flight course, meets by Emission Lasers the distance that measured target back reflection returns stadimeter mistiming calculates measured target and stadimeter.In general traditional laser pulse range measurement system, the measurement differed from by the counter deadline, when laser pulse is launched, forms main ripple, and as counter enabling signal, this hour counter starts to count the square wave of fixed frequency; When receiver receives return signal, form echo, as pass gate signal, counter quits work, and namely can be obtained the distance of measured target by the number of counter.But, pulse laser laser welder is after the pulse of measured target Emission Lasers, laser may run into other objects (as raindrop, dust etc.) and just reflect before arrival measured target, also may after arrival measured target, except once reflects laser, again reflect after running into other targets again after some laser penetration measured target.These situations all can form a laser firing pulses (main ripple), multiple reflected laser pulse (echo) phenomenon.Can only measure the first aim in range ability according to general counter distance-finding method, if run into aforesaid situation, then the target that will measure of first aim really, then there is mistake in range finding, now often needs repetitive measurement.The present invention adopts the method measuring multiple echo to overcome because measuring error when there is multiple echo.Generally traditional counter method cannot meet the range finding problem that may occur multiple target.Traditional pulsed laser ranging method often adopts the method for fixed threshold to determine the starting point of main ripple and echo, improve distance accuracy mainly to realize by the method for the input clock frequency improving counter, after clock frequency reaches certain frequency (being generally 50MHz), improve clock frequency again and cannot improve distance accuracy further, distance accuracy often can only at about 3 meters, because now affect the shape of distance accuracy mainly return laser beam.On the one hand, the laser pulse launched from laser range finder nonideal pulse; On the other hand, laser is in round-trip flight process, and waveform can change, and particularly after opto-electronic conversion, the electric signal of laser pulse has been " bell " signal, and its amplitude is not fixed.Adopt fixed threshold to determine that the sart point in time of main ripple and echo will bring larger error, thus affect final distance accuracy.The present invention determines the start time of main ripple and echo by the method for peakvalue's checking, can further improve distance accuracy.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, provides a kind of reliable, much higher target pulse laser range finder of distance accuracy rational in infrastructure, can select to show the multiple target range values in one-shot measurement.
For achieving the above object, technical scheme provided by the utility model is: a kind of multiple goal pulse laser laser welder, include trigger button, calculate and control module, laser emitting module, lens optical module, opto-electronic conversion and signal shaping module, distance display module, operation push-button, wherein, described calculating and control module respectively with trigger button, laser emitting module, opto-electronic conversion and signal shaping module, distance display module, operation push-button connects one to one, described lens optical module respectively with laser emitting module, opto-electronic conversion and signal shaping module connect one to one, after trigger button is pressed, calculating and control module send trigger command, laser emitting module receives Emission Lasers pulse after trigger command, a laser pulse part gets back to opto-electronic conversion and signal shaping module by prism, form main ripple, another part gets back to lens optical module after multiple target reflection, by opto-electronic conversion and the multiple echo of signal shaping module generation, calculating and control module receive a main ripple electric pulse and multiple echo electric impulse signal successively, calculate the distance storing each target, and show concrete numerical value by number pipe in feeding distance display module, and which measuring distance of target can be selected for display by operation push-button.
The inside of described opto-electronic conversion and signal shaping module is made up of photoelectric switching circuit, signal amplification circuit, peak detection circuit and monostable circuit, wherein, described photoelectric switching circuit, signal amplification circuit, peak detection circuit and monostable circuit are all placed in metal shielding box and shield; The laser pulse signal received is converted to analog electrical pulse signal by photodiode by described photoelectric switching circuit, and avalanche photodide AD800-10 selected by photodiode; Described signal amplification circuit amplifies the weak electric pulse signal that photodiode exports, and adopts 3 low-noise wide-band amplifier OPA847 to connect and realizes, obtain bell amplifying signal; The bell signal that described peak detection circuit process is generated by signal amplification circuit, high-speed comparator is utilized to generate a digital pulse signal at the peak value place of bell signal, and deliver in follow-up monostable circuit and carry out pulse width expansion, the burst pulse of 7 nanoseconds is become the broad pulse of 75 nanoseconds, described monostable circuit adopts SN74LV123A.
Described calculating and control module adopt Flash type FPGA low-power chip AGLN060, its inside includes counter, target storage device, target selection circuit, overflows exclusive circuit, wherein, described counter provides 150MHz reference clock by external active crystal oscillator, when counter receives main ripple signal, start counting, often receive an echoed signal and catch a count value, count value is kept in target storage device; Count value obtains target range value after calculating, and is again kept in corresponding reservoir, selects target to display by selection key by target selection circuit, by the distance of this target by six Digital sum pipe displays; Described spilling exclusive circuit is to prevent counter overflow from arranging, being connected with counter.
Described distance display module be made up of 6 Digital sum pipes, most significant digit is digital green pipe, shows which tested target, and all the other five is red charactron, display be target range, unit is rice.
Compared with prior art, tool has the following advantages and beneficial effect the utility model:
1, a laser ranging process, can obtain the multiple targets on Laser emission path, reduces the electric energy of laser range finder and improves ranging efficiency.
2, adopt 150MHz high-frequency count and peak value of pulse detection technique, eliminate the time error produced when usually adopting fixed threshold to detect the pulse moment, improve distance accuracy.
3, adopt Flash type FPGA to realize controlling and computing module, reduce power consumption, simplify circuit system structure, computational accuracy is high, does not need to adopt the crystal oscillator becoming integral multiple with the light velocity, enhances system reliability and dirigibility.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of multiple goal pulse laser laser welder.
Fig. 2 is the structural drawing of opto-electronic conversion and signal shaping module.
Fig. 3 is peak detection schematic diagram.
Fig. 4 is the structured flowchart of calculating and control module.
Embodiment
Below in conjunction with specific embodiment, the utility model is described in further detail.
As shown in Figure 1, the multiple goal pulse laser laser welder described in the present embodiment includes trigger button M100, calculating and control module M101, laser emitting module M102, lens optical module M103, opto-electronic conversion and signal shaping module M104, distance display module M105 and operation push-button M106.Described calculating and control module M101 connect one to one with trigger button M100, laser emitting module M102, opto-electronic conversion and signal shaping module M104, distance display module M105, operation push-button M106 respectively, and described lens optical module M103 coordinates with laser emitting module M102, opto-electronic conversion and signal shaping module M104 one_to_one corresponding respectively.When needs are found range, press trigger button M100, send trigger pip to calculating and control module M101, calculating and control module send trigger command to laser emitting module again.After pulse laser generates, while objective emission, part pulse laser (containing small part laser energy) by generating main ripple after lens optical module M103 process, then by opto-electronic conversion and signal shaping module M104, obtains the main ripple of electrical measurement pulse; After another part laser (containing most laser energy) pulse laser reaches target, produce reflection (possible multiple reflections), by generating echo (the multiple echo of possibility) after lens optical module M103 process, be input to opto-electronic conversion and signal shaping module M104 again, produce electrical measurement pulse echo (the multiple echo of possibility).Calculating and control module M101 receive a main ripple electric pulse and multiple echo electric impulse signal successively, obtain the mistiming between main ripple electric pulse and each echo electric pulse, thus calculate the distance of each target, and be stored in the internal storage unit of the fpga chip of calculating and control module M101, and show concrete numerical value by number pipe in feeding distance display module M105.Distance display module M105 is made up of 6 Digital sum pipes, and most significant digit is digital green pipe, shows which tested target, and all the other five is red charactron, display be target range, unit is rice.Select which measuring distance of target for display by operation push-button M106.When in a laser ranging, only has main ripple, when there is no echo, when namely there is no laser reflection, illustrate that laser is transmitted into far always, all do not run into target, distance display module M105 display 99999, represents do not have measurement target, 90000 meters of ultimate ranges being laser range finder and may measuring.
As shown in Figure 2, the inside of described opto-electronic conversion and signal shaping module is made up of photoelectric switching circuit M201, signal amplification circuit M202, peak detection circuit M203 and monostable circuit M204, in order to prevent external interference, these four circuit being all placed in metal shielding box and shielding.The laser pulse signal received is converted to analog electrical pulse signal by photodiode by photoelectric switching circuit M201, and avalanche photodide AD800-10 selected by photodiode.Signal amplification circuit M202 amplifies the faint electric impulse signal that photodiode exports, and adopts 3 low-noise wide-band amplifier OPA847 to connect and realizes, obtain the amplifying signal of similar " bell "." bell " signal that peak detection circuit M203 process is generated by signal amplification circuit, high-speed comparator COMP (selecting LM119) is utilized to generate a more satisfactory digital pulse signal at the peak value place of " bell " signal, and deliver in follow-up monostable circuit M204 and carry out pulse width expansion, the burst pulse of 7 nanoseconds is become the broad pulse of 75 nanoseconds, facilitate signal to export and reduce the bandwidth requirement to subsequent conditioning circuit, monostable circuit adopts SN74LV123A.
As shown in Figure 3, main ripple and echo laser pulse signal form the simulating signal of " bell " after opto-electronic conversion and signal amplification circuit, because laser pulse is after long-distance transmissions and target reflection, its peak value can be decayed, although adopt automatic gain control circuit at amplifying circuit, the amplitude of main ripple electric impulse signal and each echo electric impulse signal has very big difference.Now, determine the start time of main ripple and echo according to traditional fixed threshold method, then can produce time error Δ t as shown in the figure, cause distance accuracy not high, this is also that the measuring error of many high power laser stadimeters is generally the reason of ± 3 meters.The utility model utilizes the method detecting peak value of pulse to determine that main ripple and echo start time eliminate the fixed threshold pulse moment and detect the error brought.For main ripple electric pulse and multiple echo electric impulse signal, although their amplitude is different, the peak value of pulse point moment is constant, utilizes the method to detect the peak value of electric pulse, the start time of main ripple and echo can be determined well, be conducive to improving distance accuracy.Before the rising edge of bell-shaped pulse signal arrives, due to the existence of VREF (being greater than zero), the negative terminal input voltage V-of comparer is greater than V+, comparer output low level; After bell-shaped pulse arrives, pulse voltage V1 charges to electric capacity C1, and the positive input voltage V+ of comparer changes the change wanting delayed its negative terminal voltage V-, and V-is greater than V+, and comparer exports V2 and remains low level; When after V1 peak value, at the negative edge of bell signal, the decline rate of V+ is less than the decline rate of V-, by the Selecting parameter of resistance in Fig. 2 and electric capacity, as selected R1=R2=100 Ω, R3=10k Ω, C1=15pF, VREF=5V, can realize in the less time after V1 peak value, realize V+ and be greater than V-, the output V2 of comparer COMP is high level, until bell-shaped pulse terminates, the output of comparer is due to the existence of VREF, again become low level, comparer adopts LM119.Comparator circuit is identical with the time delay of echo to main ripple with monostable circuit, does not affect the measurement of distance.
Described calculating and control module adopt Flash type fpga chip AGLN060, have lower power consumption and the reliability of Geng Gao than SRAM type, because FPGA has supercomputing function, computational accuracy is high, the crystal oscillator adopted does not need the frequency selecting to become integral multiple with the light velocity, facilitates system to realize.Have employed FPGA to realize, simplify PCB circuit, improve reliability and the dirigibility of stadimeter.Adopt FPGA inside to realize multiple counter, a Laser emission can just obtain multiple target, not need repeatedly Emission Lasers to determine target range, save the electric energy of stadimeter and improve efficiency.As shown in Figure 4, the inside of this calculating and control module includes counter M401, target storage device, target selection circuit M403, overflows exclusive circuit M402, counter M401 provides 150MHz reference clock by external active crystal oscillator, when counter M401 receives main ripple signal, start counting, after this, often receive an echoed signal and catch a count value, count value is kept in target storage device.When counter counts counts to the maximal value of range finding, or n target measures all, then close counter, waits for next ranging process; If measurement target number is less than n, then to these residue destination register writes 99999, represents that these target ranges are infinite distance, close counter afterwards, wait for next ranging process.In general measure, n gets 3 ~ 5 enough, and this is taken as 3 in implementing.Count value obtains target range value after calculating, and is again kept in corresponding reservoir, selects target to display by selection key by target selection circuit M403, then the distance of this target is shown by six Digital sum pipes.Overflowing exclusive circuit M402 is to prevent counter overflow from arranging, and when the value of counter reaches 99999, stops counting, the mistake survey numerical value preventing from carry from resetting causing.
The examples of implementation of the above are only the preferred embodiment of the utility model, not limit practical range of the present utility model with this, therefore the change that all shapes according to the utility model, principle are done, all should be encompassed in protection domain of the present utility model.
Claims (4)
1. a multiple goal pulse laser laser welder, it is characterized in that: include trigger button, calculating and control module, laser emitting module, lens optical module, opto-electronic conversion and signal shaping module, distance display module, operation push-button, wherein, described calculating and control module connect one to one with trigger button, laser emitting module, opto-electronic conversion and signal shaping module, distance display module, operation push-button respectively, and described lens optical module coordinates with laser emitting module, opto-electronic conversion and signal shaping module one_to_one corresponding respectively, after trigger button is pressed, calculating and control module send trigger command, laser emitting module receives Emission Lasers pulse after trigger command, a laser pulse part gets back to opto-electronic conversion and signal shaping module by prism, form main ripple, another part gets back to lens optical module after multiple target reflection, by opto-electronic conversion and the multiple echo of signal shaping module generation, calculating and control module receive a main ripple electric pulse and multiple echo electric impulse signal successively, calculate the distance storing each target, and show concrete numerical value by number pipe in feeding distance display module, and which measuring distance of target can be selected for display by operation push-button.
2. a kind of multiple goal pulse laser laser welder according to claim 1, it is characterized in that: the inside of described opto-electronic conversion and signal shaping module is made up of photoelectric switching circuit, signal amplification circuit, peak detection circuit and monostable circuit, wherein, described photoelectric switching circuit, signal amplification circuit, peak detection circuit and monostable circuit are all placed in metal shielding box and shield; The laser pulse signal received is converted to analog electrical pulse signal by photodiode by described photoelectric switching circuit, and avalanche photodide AD800-10 selected by photodiode; Described signal amplification circuit amplifies the weak electric pulse signal that photodiode exports, and adopts 3 low-noise wide-band amplifier OPA847 to connect and realizes, obtain bell amplifying signal; The bell signal that described peak detection circuit process is generated by signal amplification circuit, high-speed comparator is utilized to generate a digital pulse signal at the peak value place of bell signal, and deliver in follow-up monostable circuit and carry out pulse width expansion, the burst pulse of 7 nanoseconds is become the broad pulse of 75 nanoseconds, described monostable circuit adopts SN74LV123A.
3. a kind of multiple goal pulse laser laser welder according to claim 1, it is characterized in that: described calculating and control module adopt Flash type FPGA low-power chip AGLN060, its inside includes counter, target storage device, target selection circuit, overflows exclusive circuit, wherein, described counter provides 150MHz reference clock by external active crystal oscillator, when counter receives main ripple signal, start counting, often receive an echoed signal and catch a count value, count value is kept in target storage device; Count value obtains target range value after calculating, and is again kept in corresponding reservoir, selects target to display by selection key by target selection circuit, by the distance of this target by six Digital sum pipe displays; Described spilling exclusive circuit is to prevent counter overflow from arranging, being connected with counter.
4. a kind of multiple goal pulse laser laser welder according to claim 1, is characterized in that: described distance display module is made up of 6 Digital sum pipes, and most significant digit is digital green pipe, show which tested target, all the other five is red charactron, display be target range, unit is rice.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106940807A (en) * | 2017-04-19 | 2017-07-11 | 深圳市元征科技股份有限公司 | A kind of processing method and processing device based on mirror device of looking in the distance |
| CN107167792A (en) * | 2017-06-09 | 2017-09-15 | 中国电子科技集团公司第三十四研究所 | A kind of Type of Atmospheric Laser Communication and its distance-finding method with distance measurement function |
| CN107367733A (en) * | 2017-07-20 | 2017-11-21 | 上海脉泽光电科技有限公司 | A kind of combination GPS distance-finding method and its range unit |
| CN107395165A (en) * | 2016-05-16 | 2017-11-24 | 上海亨骏自动化设备有限公司 | A kind of liquid level gauge echo time collection peak detection circuit |
| CN108931779A (en) * | 2017-05-27 | 2018-12-04 | 北京万集科技股份有限公司 | Identification device, laser radar and moment discrimination method at the time of based on laser radar |
| CN109669187A (en) * | 2019-01-10 | 2019-04-23 | 重庆爱特光电有限公司 | A kind of semiconductor pulse laser range finder with adaptation function |
| CN111670371A (en) * | 2019-01-09 | 2020-09-15 | 深圳市大疆创新科技有限公司 | Optical detection module and distance measuring device |
| CN112904354A (en) * | 2021-01-22 | 2021-06-04 | 西安应用光学研究所 | High-precision laser ranging distance simulation device |
| CN116908809A (en) * | 2023-08-15 | 2023-10-20 | 探维科技(苏州)有限公司 | Echo signal processing circuit of laser radar and laser radar |
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2015
- 2015-09-28 CN CN201520764242.8U patent/CN204989471U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107395165A (en) * | 2016-05-16 | 2017-11-24 | 上海亨骏自动化设备有限公司 | A kind of liquid level gauge echo time collection peak detection circuit |
| CN107395165B (en) * | 2016-05-16 | 2022-09-09 | 上海亨骏自动化设备有限公司 | Peak detection circuit for acquiring echo time of liquid level meter |
| CN106940807A (en) * | 2017-04-19 | 2017-07-11 | 深圳市元征科技股份有限公司 | A kind of processing method and processing device based on mirror device of looking in the distance |
| CN108931779A (en) * | 2017-05-27 | 2018-12-04 | 北京万集科技股份有限公司 | Identification device, laser radar and moment discrimination method at the time of based on laser radar |
| CN107167792A (en) * | 2017-06-09 | 2017-09-15 | 中国电子科技集团公司第三十四研究所 | A kind of Type of Atmospheric Laser Communication and its distance-finding method with distance measurement function |
| CN107367733A (en) * | 2017-07-20 | 2017-11-21 | 上海脉泽光电科技有限公司 | A kind of combination GPS distance-finding method and its range unit |
| CN111670371A (en) * | 2019-01-09 | 2020-09-15 | 深圳市大疆创新科技有限公司 | Optical detection module and distance measuring device |
| CN109669187A (en) * | 2019-01-10 | 2019-04-23 | 重庆爱特光电有限公司 | A kind of semiconductor pulse laser range finder with adaptation function |
| CN112904354A (en) * | 2021-01-22 | 2021-06-04 | 西安应用光学研究所 | High-precision laser ranging distance simulation device |
| CN116908809A (en) * | 2023-08-15 | 2023-10-20 | 探维科技(苏州)有限公司 | Echo signal processing circuit of laser radar and laser radar |
| CN116908809B (en) * | 2023-08-15 | 2024-03-01 | 探维科技(苏州)有限公司 | Echo signal processing circuit of laser radar and laser radar |
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