CN203688801U - Laser distance measuring device having gain control circuit - Google Patents
Laser distance measuring device having gain control circuit Download PDFInfo
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- CN203688801U CN203688801U CN201420025266.7U CN201420025266U CN203688801U CN 203688801 U CN203688801 U CN 203688801U CN 201420025266 U CN201420025266 U CN 201420025266U CN 203688801 U CN203688801 U CN 203688801U
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Abstract
The utility model discloses a laser distance measuring device having a gain control circuit. The laser distance measuring device comprises a micro processor, a pulse laser device, an APD photoelectric device, a transimpedance amplifier, a data acquisition device and a signal amplification circuit, wherein the signal amplification circuit comprises a comparator, a first adder, a gain adjusting circuit and a sampling circuit, output ends of the gain adjusting circuit and the sampling circuit are respectively connected with two input ends of the first adder, an input end of the gain adjusting circuit is electrically connected with another output end of the micro processor, an input end of the sampling circuit is connected with an output end of the comparator, output ends of the first adder and the transimpedance amplifier are respectively connected with two input ends of the comparator, and the output end of the comparator is further electrically connected with an input end of the data acquisition device. According to the laser distance measuring device, by adjusting gain of an echo signal and then by feeding the adjusting result back to the pulse laser device, the signal amplification circuit realizes homeostatic control gain, and automatic identification on objects having different reflection capabilities can be realized.
Description
Technical field
The utility model designs a kind of laser ranging system, is specifically related to this patent and is a kind of laser ranging system that makes and can realize that automatic identification is strong, the laser ranging system with gain control circuit of the ability of weak reverberation.
Background technology
Pulse type laser is measured and is adopted laser instrument as light source, using laser as carrier wave, according to time-of-flight, by the mistiming measuring distance between detection laser transponder pulse and laser echo pulse, possess simple in structure, cheap, reliability is high, strong anti-interference performance, does not need the advantages such as cooperative target, on civilian and military, is widely applied.
The echo-pulse of laser is generally by APD(Avalanche Photo Diode) detector realizes, and in order to reduce the rate of false alarm of APD detector, generally can between itself and data collector, increase amplifier to improve gain effect.Publication number is that the Chinese invention patent of CN1227344 discloses laser distance measurement method and device thereof, in this invention, provide a kind of gain control program, the VREF voltage of quick the first comparer is set to the DC level of leading portion signal amplification circuit output terminal very approaching, thereby obtain a very large signal magnification.The Chinese invention patent that publication number is CN102621555A in addition provides a kind of bivalve value moment discriminator circuit, regulates threshold values by circuit self-adaptation, thereby reduces rate of false alarm.
Current laser ranging system substantially all adopts the gain control program of CN1227344, and the gain of circuit is controlled to maximal value by this control program, even the feedback signal of extremely weak reverberation can extract.In actual applications, usually need to identify the target that some emissive ability are very strong and notify user, this control program just cannot achieve this end, same, the same existence of the Chinese invention patent problem strong to distinguishing, weak reverberation that publication number is CN102621555A.
Utility model content
For above deficiency, the utility model provides a kind of laser ranging system with gain control circuit, and it not only can be identified automatically to weak reverberation, can also regulate to the sensitivity of laser ranging system strong, the weak reverberation of automatic distinguishing simultaneously.
For realizing above object, the technical scheme that the utility model is taked is:
A kind of laser ranging system with gain control circuit, described laser ranging system comprises microprocessor, pulsed laser, APD photodetector, transreactance amplifier, data acquisition unit, a wherein output terminal of described microprocessor and the input end of pulsed laser are electrically connected, the output terminal of APD photodetector passes through transreactance amplifier successively, the input end of data acquisition unit and microprocessor is electrically connected, this laser ranging system further comprises that one is connected in the signal amplification circuit between transreactance amplifier and data acquisition unit, described signal amplification circuit comprises the first comparer, first adder, gain adjusting circuit and sample circuit, the output terminal of described gain adjusting circuit and sample circuit is connected to respectively two input ends of first adder, wherein, the input end of gain adjusting circuit is electrically connected at another output terminal of microprocessor, the input end of sample circuit is connected to the output terminal of the first comparer, the output terminal of first adder and transreactance amplifier is connected to two input ends of the first comparer, the output terminal of the first comparer is also electrically connected with the input end of data acquisition unit.
Described laser ranging system further comprises that one is connected in the adjustable driver of power between microprocessor and pulsed laser.
Described power is adjustable, and driver comprises integrator, the second comparer, a PWM timing sequencer, the first boost pressure controller and switch gate, wherein, microprocessor is connected to a wherein input end of the second comparer by integrator, the output terminal of the first boost pressure controller is connected to another input end of the second comparer, the output terminal of the second comparer is connected to the input end of the first boost pressure controller by a PWM timing sequencer, the output terminal of the first boost pressure controller is also connected to pulsed laser by switch gate, and microprocessor and switch gate are electrically connected.
Described power is adjustable, and driver further comprises that one is connected in the first energy storage component between the first boost pressure controller and switch gate.
Described laser ranging system further comprises that one is connected in the APD sensitivity adjusting circuit between APD photodetector and microprocessor.
Described APD sensitivity adjusting circuit comprises second adder, temperature sensor, the 3rd comparer, the 2nd PWM timing sequencer and the second boost pressure controller, wherein, two input ends of described second adder respectively with microprocessor, temperature sensor is connected, two input ends of the 3rd comparer are connected to the output terminal of second adder and the output terminal of the second boost pressure controller, the output terminal of the 3rd comparer is connected to the input end of the second boost pressure controller by the 2nd PWM timing sequencer, the output terminal of described the second boost pressure controller is also connected with APD photodetector.
Described APD sensitivity adjusting circuit further comprises that one is connected in the second energy storage component between the second boost pressure controller and APD photodetector.
Compared with prior art, its beneficial effect is the utility model:
1, in laser ranging system, increase signal amplification circuit with the control that gains, this signal amplification circuit regulates by the gain to transreactance amplifier, and Output rusults is fed back to microprocessor, emissive power by microprocessor paired pulses laser instrument regulates, thereby realize the object of homomorphism ride gain, can automatically identify the target of different reflection potentiales.
2, can regulate the sensitivity of APD photodetector by APD sensitivity adjusting circuit according to the factor such as illumination and temperature in external environment, make APD photodetector in reliable output state.
3, can be according to demand, the emissive power of active adjustment pulse laser, further improves the ability of the target identification to different reflection potentiales.
Brief description of the drawings
Fig. 1 is the structured flowchart of a kind of laser ranging system with gain control circuit of the utility model;
Fig. 2 is the structured flowchart of the adjustable driver of power in Fig. 1;
Fig. 3 is the structured flowchart of APD sensitivity adjusting circuit in Fig. 1.
Wherein: 1, microprocessor; 2, pulsed laser; 21, the adjustable driver of power; 211, integrator; 212, comparer; 213, PWM timing sequencer; 214, boost pressure controller; 215, energy storage component; 216, switch gate; 3, target; 4, APD photodetector; 41, APD sensitivity adjusting circuit; 411, totalizer; 412, temperature sensor; 413, comparer; 414, PWM timing sequencer; 415, boost pressure controller; 416, energy storage component; 5, transreactance amplifier; 6, signal amplification circuit; 61, comparer; 62, totalizer; 63, gain adjusting circuit; 64, sample circuit; 7, data acquisition unit.
Embodiment
Below in conjunction with the drawings and specific embodiments, content of the present utility model is described in further details.
Embodiment
Please refer to shown in Fig. 1, a kind of laser ranging system with gain control circuit, it comprises microprocessor 1, pulsed laser 2, APD photodetector 4, transreactance amplifier 5, signal amplification circuit 6, data acquisition unit 7, and a wherein output terminal of microprocessor 1 is electrically connected by the adjustable driver 21 of power and the input end of pulsed laser 2.The output terminal of APD photodetector 4 is electrically connected by transreactance amplifier 5, signal amplification circuit 6 and data acquisition unit 7 and the input end of microprocessor 1 successively.Signal amplification circuit 6 comprises comparer 61, totalizer 62, gain adjusting circuit 63 and sample circuit 64, the output terminal of gain adjusting circuit 63 and sample circuit 64 is connected to respectively two input ends of totalizer 62, wherein, the input end of gain adjusting circuit 63 is electrically connected at another output terminal of microprocessor 1, the input end of sample circuit 64 is connected to the output terminal of comparer 61, the output terminal of totalizer 62 and transreactance amplifier 5 is connected to two input ends of comparer 61, and the output terminal of comparer 61 is also electrically connected with the input end of data acquisition unit 7.
Its principle of work is: pulsed laser 2 is launched certain laser pulse to target 3, its echoed signal is surveyed by APD photodetector 4, the echo voltage signal that APD photodetector 4 is surveyed obtains input voltage after amplifying by transreactance amplifier 5, together with the reference voltage of exporting with totalizer 62, deliver to the input end of comparer 61, comparer 61 is by input voltage and reference voltage comparison, and echoed signal is converted to digital signal, capture at a high speed with the interval of 5ns the digital signal that comparer 61 is exported by data acquisition unit 7, and carry out digital filtering operation and stored by its self-contained storing devices.In the time completing a frame data crawl, to hand over to microprocessor 1, microprocessor 1 regulates to change by the emissive power of the adjustable driver 21 paired pulses laser instruments 2 of power the laser pulse that pulsed laser 2 is launched after this digital signal is processed as required.The reference voltage that totalizer 62 is exported has two part voltages to be coupled to form, wherein a part is carried out the control voltage that free microprocessor 1 produces by gain adjusting circuit 63, and gain adjusting circuit 63 can be made up of voltage control Amplifier AD8337 chip and peripheral circuit thereof.Another part to the output of comparer 61 by sample circuit 64 sampled voltage obtaining of sampling, sample circuit 64 is by carrying out integration to the output signal of comparer 61, feed back to again the reference edge of comparer 61 by totalizer 62, form closed feedback loop, in the time of control voltage release control that microprocessor 1 produces, comparer 61 is set to maximum gain state by this feedback signal.
The structure of power is adjustable driver 21 please refer to shown in Fig. 2, it comprises integrator 211, comparer 212, PWM timing sequencer 213, boost pressure controller 214, energy storage component 215 and switch gate 216, wherein, microprocessor 1 carries out being connected to after digital-to-analog conversion a wherein input end of comparer 212 by integrator 211, the output terminal of boost pressure controller 214 is connected to another input end of comparer 212, the output terminal of comparer 212 is connected to the input end of boost pressure controller 214 by PWM timing sequencer 213, the output terminal of boost pressure controller 214 also passes through energy storage component 215 successively, switch gate 216 is connected to pulsed laser 2, microprocessor 1 is electrically connected with switch gate 216.Its principle of work is: the digital signal that microprocessor 1 gathers according to data acquisition unit 7 is exported a voltage signal to integrator 211, integrator 211 converts this voltage signal to simulating signal, with the positive-negative input end of delivering to comparer 212 together with the feedback signal of boost pressure controller 214 output terminals, comparer 212 transfers to PWM timing sequencer 213 to produce certain clock signal after two signals are compared, again by boost pressure controller 214 boost process and energy storage component 215 carry out, after energy storage and filtering, delivering to pulsed laser 2 by switch gate 216.Opening and close by microprocessor 1 of switch gate 216 controlled.Energy storage component 215 can adopt electric capacity, and switch gate 216 can adopt triode or metal-oxide-semiconductor.
The sensitivity of APD photodetector 4 is subject to the proportionate relationship control of operating voltage and voltage breakdown, and operating voltage is got over asymptotic breakdown voltage, and sensitivity is higher, but APD can damage while exceeding voltage breakdown.The voltage breakdown of the APD of the highly sensitive model of part changes with working temperature simultaneously.Therefore, in the utility model preferred embodiment, specifically by microprocessor 1 to external world in environment such as illumination and background signal Carrier To Noise Power Density etc. monitor, by being electrically connected at, APD sensitivity adjusting circuit 41 between APD photodetector 4 and microprocessor 1 controls the sensitivity of APD photodetector 4.
The structure of APD sensitivity adjusting circuit 41 please refer to shown in Fig. 3, it comprises totalizer 411, temperature sensor 412, comparer 413, PWM timing sequencer 414, boost pressure controller 415 and energy storage component 416, wherein, two input ends of totalizer 411 respectively with microprocessor 1, temperature sensor 412 is connected, two input ends of comparer 413 are connected to the output terminal of totalizer 411 and the output terminal of boost pressure controller 415, the output terminal of comparer 413 is connected to the input end of boost pressure controller 415 by PWM timing sequencer 414, the output terminal of boost pressure controller 415 is also connected with APD photodetector 4 by energy storage component 416.Its principle of work is: microprocessor 1 to external world in environment such as illumination and background signal Carrier To Noise Power Density etc. monitor totalizer 411 exported to a voltage signal, the temperature sensor 412 that environment temperature is monitored produces another voltage signal, totalizer 411 by this another voltage signal after above-mentioned voltage signal superposes, with the positive-negative input end of delivering to comparer 413 together with the feedback signal of boost pressure controller 415 output terminals, comparer 413 transfers to PWM timing sequencer 414 to produce certain clock signal after two signals are compared, again by boost pressure controller 415 boost process and energy storage component 416 carry out after energy storage and filtering, deliver to APD photodetector 4.Energy storage component 416 can adopt electric capacity.
Above-listed detailed description is for the illustrating of the utility model possible embodiments, and this embodiment is not in order to limit the scope of the claims of the present utility model, does not allly depart from the equivalence that the utility model does and implements or change, and all should be contained in the scope of the claims of this case.
Claims (7)
1. the laser ranging system with gain control circuit, described laser ranging system comprises microprocessor (1), pulsed laser (2), APD photodetector (4), transreactance amplifier (5), data acquisition unit (7), a wherein output terminal of described microprocessor (1) and the input end of pulsed laser (2) are electrically connected, the output terminal of APD photodetector (4) is successively by transreactance amplifier (5), data acquisition unit (7) is electrically connected with the input end of microprocessor (1), it is characterized in that, this laser ranging system further comprises that one is connected in the signal amplification circuit (6) between transreactance amplifier (5) and data acquisition unit (7), described signal amplification circuit (6) comprises the first comparer (61), first adder (62), gain adjusting circuit (63) and sample circuit (64), the output terminal of described gain adjusting circuit (63) and sample circuit (64) is connected to respectively two input ends of first adder (62), wherein, the input end of gain adjusting circuit (63) is electrically connected at another output terminal of microprocessor (1), the input end of sample circuit (64) is connected to the output terminal of the first comparer (61), the output terminal of first adder (62) and transreactance amplifier (5) is connected to two input ends of the first comparer (61), the output terminal of the first comparer (61) is also electrically connected with the input end of data acquisition unit (7).
2. the laser ranging system with gain control circuit according to claim 1, is characterized in that, described laser ranging system further comprises that one is connected in the adjustable driver of power (21) between microprocessor (1) and pulsed laser (2).
3. the laser ranging system with gain control circuit according to claim 2, it is characterized in that, described power is adjustable, and driver (21) comprises integrator (211), the second comparer (212), the one PWM timing sequencer (213), the first boost pressure controller (214) and switch gate (216), wherein, microprocessor (1) is connected to a wherein input end of the second comparer (212) by integrator (211), the output terminal of the first boost pressure controller (214) is connected to another input end of the second comparer (212), the output terminal of the second comparer (212) is connected to the input end of the first boost pressure controller (214) by a PWM timing sequencer (213), the output terminal of the first boost pressure controller (214) is also connected to pulsed laser (2) by switch gate (216), microprocessor (1) is electrically connected with switch gate (216).
4. the laser ranging system with gain control circuit according to claim 2, it is characterized in that, described power is adjustable, and driver (21) further comprises that one is connected in the first energy storage component (215) between the first boost pressure controller (214) and switch gate (216).
5. according to the laser ranging system with gain control circuit described in claim 1-4 any one, it is characterized in that, described laser ranging system further comprises that one is connected in the APD sensitivity adjusting circuit (41) between APD photodetector (4) and microprocessor (1).
6. the laser ranging system with gain control circuit according to claim 5, it is characterized in that, described APD sensitivity adjusting circuit (41) comprises second adder (411), temperature sensor (412), the 3rd comparer (413), the 2nd PWM timing sequencer (414) and the second boost pressure controller (415), wherein, two input ends of described second adder (411) respectively with microprocessor (1), temperature sensor (412) is connected, two input ends of the 3rd comparer (413) are connected to the output terminal of second adder (411) and the output terminal of the second boost pressure controller (415), the output terminal of the 3rd comparer (413) is connected to the input end of the second boost pressure controller (415) by the 2nd PWM timing sequencer (414), the output terminal of described the second boost pressure controller (415) is also connected with APD photodetector (4).
7. the laser ranging system with gain control circuit according to claim 6, it is characterized in that, described APD sensitivity adjusting circuit (41) further comprises that one is connected in the second energy storage component (416) between the second boost pressure controller (415) and APD photodetector (4).
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| CN201420025266.7U CN203688801U (en) | 2014-01-15 | 2014-01-15 | Laser distance measuring device having gain control circuit |
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| CN201420025266.7U CN203688801U (en) | 2014-01-15 | 2014-01-15 | Laser distance measuring device having gain control circuit |
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| CN104410378A (en) * | 2014-10-20 | 2015-03-11 | 北京空间机电研究所 | Gain stabilization control circuit for photoelectric detector system |
| CN104483675A (en) * | 2014-12-18 | 2015-04-01 | 扬州天目光电科技有限公司 | Self-adaptive laser ranging device and self-adaptive laser ranging method |
| CN106842223A (en) * | 2016-12-06 | 2017-06-13 | 武汉万集信息技术有限公司 | Laser ranging system and method |
| CN106841970A (en) * | 2017-03-02 | 2017-06-13 | 成都优博创通信技术股份有限公司 | Calculate the method and its circuit of APD breakdown voltages |
| CN106931951A (en) * | 2017-03-09 | 2017-07-07 | 邓加滨 | Civil engineering portable surveying instrument |
| CN107831498A (en) * | 2017-12-06 | 2018-03-23 | 杭州隆硕科技有限公司 | A kind of reception device and a kind of telescopic range finder |
| WO2018176288A1 (en) * | 2017-03-29 | 2018-10-04 | 深圳市大疆创新科技有限公司 | Laser radar and time measurement method based on laser radar |
| CN109298408A (en) * | 2018-11-22 | 2019-02-01 | 深圳天眼激光科技有限公司 | Laser scanner control system |
| CN109581406A (en) * | 2018-11-22 | 2019-04-05 | 深圳天眼激光科技有限公司 | A kind of the return laser beam processing method and system of adaptive automatic growth control |
| 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 |
| CN109946674A (en) * | 2019-03-25 | 2019-06-28 | 淮阴工学院 | Full wave shape laser radar apparatus |
| US10539663B2 (en) | 2017-03-29 | 2020-01-21 | SZ DJI Technology Co., Ltd. | Light detecting and ranging (LIDAR) signal processing circuitry |
| WO2020103805A1 (en) * | 2018-11-19 | 2020-05-28 | Suteng Innovation Technology Co., Ltd. | Lidar signal receiving circuits, lidar signal gain control methods, and lidars using the same |
| CN114994643A (en) * | 2022-07-18 | 2022-09-02 | 四川吉埃智能科技有限公司 | APD bias voltage adjusting method and circuit in laser ranging |
| TWI822800B (en) * | 2018-06-21 | 2023-11-21 | 日商日本信號股份有限公司 | Distance measuring method and distance measuring device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104410378A (en) * | 2014-10-20 | 2015-03-11 | 北京空间机电研究所 | Gain stabilization control circuit for photoelectric detector system |
| CN104410378B (en) * | 2014-10-20 | 2017-04-19 | 北京空间机电研究所 | Gain stabilization control circuit for photoelectric detector system |
| CN104483675A (en) * | 2014-12-18 | 2015-04-01 | 扬州天目光电科技有限公司 | Self-adaptive laser ranging device and self-adaptive laser ranging method |
| CN106842223A (en) * | 2016-12-06 | 2017-06-13 | 武汉万集信息技术有限公司 | Laser ranging system and method |
| CN106841970A (en) * | 2017-03-02 | 2017-06-13 | 成都优博创通信技术股份有限公司 | Calculate the method and its circuit of APD breakdown voltages |
| CN106931951A (en) * | 2017-03-09 | 2017-07-07 | 邓加滨 | Civil engineering portable surveying instrument |
| US10539663B2 (en) | 2017-03-29 | 2020-01-21 | SZ DJI Technology Co., Ltd. | Light detecting and ranging (LIDAR) signal processing circuitry |
| WO2018176288A1 (en) * | 2017-03-29 | 2018-10-04 | 深圳市大疆创新科技有限公司 | Laser radar and time measurement method based on laser radar |
| CN107831498A (en) * | 2017-12-06 | 2018-03-23 | 杭州隆硕科技有限公司 | A kind of reception device and a kind of telescopic range finder |
| CN107831498B (en) * | 2017-12-06 | 2024-03-12 | 杭州隆硕科技有限公司 | Receiving device and telescope range finder |
| TWI822800B (en) * | 2018-06-21 | 2023-11-21 | 日商日本信號股份有限公司 | Distance measuring method and distance measuring device |
| WO2020103805A1 (en) * | 2018-11-19 | 2020-05-28 | Suteng Innovation Technology Co., Ltd. | Lidar signal receiving circuits, lidar signal gain control methods, and lidars using the same |
| US11703590B2 (en) | 2018-11-19 | 2023-07-18 | Suteng Innovation Technology Co., Ltd. | Lidar signal receiving circuits, lidar signal gain control methods, and lidars using the same |
| CN109298408A (en) * | 2018-11-22 | 2019-02-01 | 深圳天眼激光科技有限公司 | Laser scanner control system |
| CN109581406A (en) * | 2018-11-22 | 2019-04-05 | 深圳天眼激光科技有限公司 | A kind of the return laser beam processing method and system of adaptive automatic growth control |
| 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 |
| CN109946674A (en) * | 2019-03-25 | 2019-06-28 | 淮阴工学院 | Full wave shape laser radar apparatus |
| CN114994643A (en) * | 2022-07-18 | 2022-09-02 | 四川吉埃智能科技有限公司 | APD bias voltage adjusting method and circuit in laser ranging |
| CN114994643B (en) * | 2022-07-18 | 2022-11-15 | 四川吉埃智能科技有限公司 | APD bias voltage adjusting method and circuit in laser ranging |
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Effective date of registration: 20160406 Address after: 510100, No. three, No. 40, Sha Tau Road, Yuexiu District, Guangdong, Guangzhou Patentee after: Guo Junzhao Address before: 523700, Guangdong, Dongguan province Fenggang town Yan Tian Village head Tong Industrial District, No. 40 Tong Avenue Patentee before: DONGGUAN XINCHUANGLIYINGFU ELECTRONIC CO., LTD. |
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Granted publication date: 20140702 Termination date: 20190115 |