CN102946242A - High-precision time discriminator circuit - Google Patents
High-precision time discriminator circuit Download PDFInfo
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- CN102946242A CN102946242A CN201210436615XA CN201210436615A CN102946242A CN 102946242 A CN102946242 A CN 102946242A CN 201210436615X A CN201210436615X A CN 201210436615XA CN 201210436615 A CN201210436615 A CN 201210436615A CN 102946242 A CN102946242 A CN 102946242A
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Abstract
The invention discloses a high-precision time discriminator circuit which comprises two APD (Avalanche Photo Diode) detectors, wherein signal output ends of the two APD detectors are respectively connected with signal input ends of two conditioning circuits, output ends of the two conditioning circuits are respectively connected to an S1 interface and an S2 interface of a first electronic switch, a signal output end of a time interval measurement module is connected with a signal input port of a CPU (Central Processing Unit), and two I/O interfaces of the CPU are respectively connected to control signal interfaces of two electronic switches. According to the high-precision time discriminator circuit, the two APD detectors are arranged to send an emitting signal and a receiving signal to the same set of subsequent processing circuit, the difference of the inherent error of the same set of electronic component and electronic chip is very little in the same circuit, therefore, the error of a range measurement system can be reduced after the emitting signal and the receiving signal are sent to the same set of the subsequent processing circuit, and the measurement accuracy can be increased.
Description
Technical field
The invention belongs to constantly discriminating field, relate to a kind of moment discriminator circuit, especially a kind of high accuracy is discriminator circuit constantly.
Background technology
Along with the development of laser technology, the technology of laser ranging has been tending towards improving and is ripe.Two kinds of methods of the general employing of laser ranging: impulse method and phase method.Wherein the development of pulsed laser ranging method is rapid, uses also very extensive.The laser that rangefinder is launched is received by rangefinder again after the reflection of object being measured, and rangefinder is the round time of recording laser simultaneously.Half of the product of the light velocity and two-way time is exactly the distance between rangefinder and the object being measured.Traditional method is signal that pulse laser is sent generation and receive the signal that produces and be sent among the different subsequent process circuit of two covers.Yet because the intrinsic error that electronic component and electronic chip exist has difference in different circuit, the intrinsic error of the subsequent process circuit that two covers are different is also different.Therefore, with increasing the error of ranging system among sending signal and the reception signal being sent to the different subsequent process circuit of two covers, precision is descended to some extent.
Summary of the invention
The object of the invention is to overcome the shortcoming of above-mentioned prior art, constantly discriminator circuit of a kind of high accuracy is provided, this circuit will send signal and be sent among the same set of subsequent process circuit with receiving signal, can offset the error that this respect increases, and improve the precision of measuring.
The objective of the invention is to solve by the following technical programs:
A kind of high accuracy is discriminator circuit constantly, comprises two APD detectors, two modulate circuits, two electronic switches, two comparators, attenuation module, time delay module, time interval measurement module and CPU module; The signal output part of described two APD detectors links to each other with the signal input part of two modulate circuits respectively, the output of two modulate circuits is connected respectively to S1 and the S2 interface of the first electronic switch, and the output of the first electronic switch links to each other with positive input, attenuation module input and the time delay module input of the first comparator respectively; The output of described attenuation module and time delay module is connected respectively to reverse input end and the positive input of the second comparator; The output of described two comparators all is connected to two signal input parts with door, links to each other with the input of the second electronic switch with the output of door, and the S1 of the second electronic switch and S2 interface all are connected to two inputs of time interval measurement module; The signal output part of described time interval measurement module links to each other with the signal input of CPU, and two I/O interfaces of CPU are connected respectively on the control signal interface of two electronic switches.
Above-mentioned comparator adopts high-speed comparator MAX9600.
The signal output part of above-mentioned time interval measurement module links to each other with CPU by the SPI interface of CPU.
The present invention arranges two APD detectors, to send signal is sent among the same set of subsequent process circuit with the reception signal, because the difference of intrinsic error in identical circuit of same set of electronic component and electronic chip is very little, therefore, be sent to the error that can reduce ranging system among the same set of subsequent process circuit with sending signal with receiving signal, improve the precision of measuring.
Description of drawings
Fig. 1 is overall structure schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is done and to describe in further detail:
Referring to Fig. 1, this high accuracy is discriminator circuit constantly, comprises two APD detectors, two modulate circuits, two electronic switches, two comparators, attenuation module, time delay module, time interval measurement module and CPU module; The signal output part of described two APD detectors links to each other with the signal input part of two modulate circuits respectively, the output of two modulate circuits is connected respectively to S1 and the S2 interface of the first electronic switch 5, and the output of the first electronic switch links to each other with positive input, attenuation module input and the time delay module input of the first comparator 6 respectively; The output of described attenuation module and time delay module is connected respectively to reverse input end and the positive input of the second comparator 7; The output of described two comparators all is connected to two signal input parts with door 8, links to each other with the input of the second electronic switch 9 with the output of door 8, and the S1 of the second electronic switch 9 and S2 interface all are connected to two inputs of time interval measurement module; The signal output part of described time interval measurement module links to each other with the signal input of CPU, and two I/O interfaces of CPU are connected respectively on the control signal interface of two electronic switches.Comparator adopts high-speed comparator MAX9600.The signal output part of time interval measurement module links to each other with CPU by the SPI interface of CPU.
Referring to Fig. 1, specific implementation process of the present invention is as follows:
CPU makes the S1 conducting by I/O mouth output low level, when an APD detector 1 receives illumination, produces square wave A.S1 conducting this moment, S2 disconnects, so square wave A just can enter among follow-up the first modulate circuit 3 by the first electronic switch 5.Before laser reflected from target, CPU made the S2 conducting by I/O mouth output high level.When reflector laser shines on the 2nd APD detector 2, produce square wave B.And S2 conducting this moment, S1 disconnects, so square wave B just can enter among follow-up the second modulate circuit 4 by the first electronic switch 5.Used two high-speed comparator MAX9600 among the subsequent conditioning circuit, one of them is used for moment discrimination ratio, and another is to suppress to disturb.One of output access and the door (8) of two MAX9600, when square wave is that laser by target reflection is when producing, at a high speed the pulse of the generation after relatively at first is connected into the time interval measurement module by S1, CPU switches to S2 again with switch afterwards, wait for that square wave B is connected into the time interval measurement module by S2, at last, the time interval measurement module is measured the time interval between two pulses, and is input in CPU by the SPI mouth time interval measurement value and calculates distance value.
Claims (3)
1. a high accuracy moment discriminator circuit is characterized in that: comprise two APD detectors, two modulate circuits, two electronic switches, two comparators, attenuation module, time delay module, time interval measurement module and CPU module; The signal output part of described two APD detectors links to each other with the signal input part of two modulate circuits respectively, the output of two modulate circuits is connected respectively to S1 and the S2 interface of the first electronic switch (5), and the output of the first electronic switch links to each other with positive input, attenuation module input and the time delay module input of the first comparator (6) respectively; The output of described attenuation module and time delay module is connected respectively to reverse input end and the positive input of the second comparator (7); The output of described two comparators all is connected to two signal input parts with door (8), link to each other with the input of the second electronic switch (9) with the output of door (8), the S1 of the second electronic switch (9) and S2 interface all are connected to two inputs of time interval measurement module; The signal output part of described time interval measurement module links to each other with the signal input of CPU, and two I/O interfaces of CPU are connected respectively on the control signal interface of two electronic switches.
2. a kind of high accuracy moment discriminator circuit according to claim 1 is characterized in that: described comparator employing high-speed comparator MAX9600.
3. a kind of high accuracy according to claim 1 discriminator circuit constantly, it is characterized in that: the signal output part of described time interval measurement module links to each other with CPU by the SPI interface of CPU.
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| CN201210436615.XA CN102946242B (en) | 2012-11-05 | 2012-11-05 | A kind of High-precision time discriminator circuit |
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| CN201210436615.XA CN102946242B (en) | 2012-11-05 | 2012-11-05 | A kind of High-precision time discriminator circuit |
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| CN102946242B CN102946242B (en) | 2015-10-28 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5610611A (en) * | 1994-12-19 | 1997-03-11 | The Regents Of The University Of California | High accuracy electronic material level sensor |
| WO2003088485A1 (en) * | 2002-04-10 | 2003-10-23 | The Johns Hopkins University | The time of flight system on a chip |
| CN102435994A (en) * | 2011-11-30 | 2012-05-02 | 西安交通大学 | Active laser detection apparatus |
| CN102540196A (en) * | 2011-12-29 | 2012-07-04 | 扬州大学 | Automobile anti-collision sensor based on laser distance measurement |
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2012
- 2012-11-05 CN CN201210436615.XA patent/CN102946242B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5610611A (en) * | 1994-12-19 | 1997-03-11 | The Regents Of The University Of California | High accuracy electronic material level sensor |
| WO2003088485A1 (en) * | 2002-04-10 | 2003-10-23 | The Johns Hopkins University | The time of flight system on a chip |
| CN102435994A (en) * | 2011-11-30 | 2012-05-02 | 西安交通大学 | Active laser detection apparatus |
| CN102540196A (en) * | 2011-12-29 | 2012-07-04 | 扬州大学 | Automobile anti-collision sensor based on laser distance measurement |
Non-Patent Citations (2)
| Title |
|---|
| 王晓冬: ""高频脉冲激光测距接收系统设计"", 《中国优秀硕士学位论文全文数据库 信息科技辑》, no. 07, 15 July 2010 (2010-07-15), pages 135 - 23 * |
| 黄钊: ""脉冲激光测距高精度关键技术研究"", 《中国优秀硕士学位论文全文数据库 信息科技辑》, no. 07, 15 July 2012 (2012-07-15), pages 135 - 143 * |
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Address after: Room 820, 8th Floor, Zhongchuang Plaza, No. 385 Aerospace Middle Road, Aerospace Base, Xi'an City, Shaanxi Province, 710000 Patentee after: Xi'an Shenrui Intelligent Technology Co.,Ltd. Address before: 710199 Shaanxi Xi'an Aerospace base 385 space Road 8, 820 floor, Chong Chuang square. Patentee before: XI'AN SHENQIONG PHOTOELECTRIC TECHNOLOGY CO.,LTD. |
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Effective date of registration: 20230706 Address after: No. 813, 1F, No. 6, Tongxing Road, Jinniu District, Chengdu, Sichuan 610000 Patentee after: Chengdu Shenrui Intelligent Technology Co.,Ltd. Address before: Room 820, 8th Floor, Zhongchuang Plaza, No. 385 Aerospace Middle Road, Aerospace Base, Xi'an City, Shaanxi Province, 710000 Patentee before: Xi'an Shenrui Intelligent Technology Co.,Ltd. |