CN111474550A - Program-controlled self-adaptive narrow pulse driving circuit suitable for high-precision distance measurement - Google Patents
Program-controlled self-adaptive narrow pulse driving circuit suitable for high-precision distance measurement Download PDFInfo
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- CN111474550A CN111474550A CN202010467805.2A CN202010467805A CN111474550A CN 111474550 A CN111474550 A CN 111474550A CN 202010467805 A CN202010467805 A CN 202010467805A CN 111474550 A CN111474550 A CN 111474550A
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- 238000005259 measurement Methods 0.000 title claims abstract description 11
- 238000001514 detection method Methods 0.000 claims abstract description 24
- 239000004065 semiconductor Substances 0.000 claims abstract description 20
- 239000003990 capacitor Substances 0.000 claims description 21
- 230000003044 adaptive effect Effects 0.000 claims description 10
- 239000013078 crystal Substances 0.000 claims description 4
- 238000002310 reflectometry Methods 0.000 abstract description 7
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 238000003079 width control Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/06—Systems determining position data of a target
- G01S17/08—Systems determining position data of a target for measuring distance only
- G01S17/10—Systems determining position data of a target for measuring distance only using transmission of interrupted, pulse-modulated waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/483—Details of pulse systems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
- H01S5/042—Electrical excitation ; Circuits therefor
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- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Computer Networks & Wireless Communication (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Optics & Photonics (AREA)
- Optical Radar Systems And Details Thereof (AREA)
Abstract
The invention provides a program-controlled self-adaptive narrow pulse driving circuit suitable for high-precision distance measurement, which comprises a signal detection circuit for detecting the pulse width of a target return signal in real time, wherein the signal detection circuit outputs data information suitable for the reflectivity after the reflectivity of an external target changes, and further comprises an MCU minimum system, an MCU control circuit and a narrow pulse generation circuit, wherein the signal detection circuit, the MCU minimum system, the MCU control circuit and the narrow pulse generation circuit are sequentially connected, the MCU minimum system reads the pulse width information fed back by the target from the signal detection circuit and then judges, and the MCU control circuit changes parameters to influence the narrow pulse generation circuit to generate a suitable semiconductor driving pulse width.
Description
Technical Field
The invention belongs to the technical field of laser photoelectricity, and particularly relates to a program-controlled self-adaptive narrow pulse driving circuit suitable for high-precision distance measurement.
Background
The working principle of the semiconductor laser is as follows: the semiconductor laser diode emits light by transition between energy bands using a semiconductor substance, and then outputs laser light by oscillating and feeding back the light using a semiconductor crystal. Compared with a solid laser, the semiconductor laser has the outstanding advantages of small volume, good stability, low power consumption and the like, so that the stable and reliable driving of laser emission is important in micro laser ranging.
The narrow pulse width driving of the existing semiconductor laser in the current market is generally ten nanoseconds, an MCU (microprogrammed control unit) controller cannot provide accurate pulse width control, and needs to be driven and controlled by a hardware circuit, so the driven narrow pulse width is a fixed mode, and in the actual ranging process, because the environment is complex, the pulse width needs to be changed to improve the precision and the ranging distance.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention provides a program-controlled self-adaptive narrow pulse driving circuit suitable for high-precision distance measurement, so that the precision problem of a semiconductor laser distance measuring machine under different targets is improved, and the influence of the difference of target reflectivity on the laser distance measuring precision is reduced.
The technical scheme adopted by the invention is as follows: a program-controlled self-adaptive narrow pulse driving circuit suitable for high-precision distance measurement comprises a signal detection circuit for detecting the pulse width of a target return signal in real time, and further comprises an MCU minimum system, an MCU control circuit and a narrow pulse generation circuit, wherein the signal detection circuit, the MCU minimum system, the MCU control circuit and the narrow pulse generation circuit are sequentially connected, and the MCU minimum system reads pulse width information fed back by a target from the signal detection circuit and then judges the pulse width information and controls the narrow pulse generation circuit to generate a proper semiconductor driving pulse width;
the narrow pulse generating circuit comprises a microcontroller U3, a microcontroller U4 and a driving chip U5, wherein a pin 1 and a pin 3 of the microcontroller U3 are connected to a capacitor C15 and then grounded, a pin 1 of the microcontroller U3 is also connected with a MCU minimum system, a pin 5 of the microcontroller U3, a pin 5 of the microcontroller U4 and a pin 1 of the driving chip U5 are all connected to a power supply voltage VCC, a pin 6 of the microcontroller U3 is connected to a pin 1 of the microcontroller U4 through a resistor R9, a pin 1 of the microcontroller U4 is grounded through a capacitor C12, a pin 3 of the microcontroller U4 is grounded through a capacitor C16, a pin 3 of the microcontroller U4 and a pin 4 of the microcontroller U3 are both connected to an MCU control circuit, a pin 4 of the microcontroller U4 is connected to a pin 4 of the driving chip U4 through a resistor R4, a pin 6 of the microcontroller U4 is connected to a pin 3 of the driving chip U4 through a resistor R4, and a pin 3 of the capacitor U4 are connected with a pin C4 and a pin 4, a pin 1 of the driving chip U5 is grounded through a capacitor C13, a pin 2 of the driving chip U5 is grounded, and a pin 5 and a pin 6 of the driving chip U5 are jointly used as pulse output ports and used for generating proper semiconductor driving pulse width;
the MCU control circuit comprises a digital potentiometer U2, wherein a pin 1 of the digital potentiometer U2 is connected with a power supply voltage VCC, a pin 5 and a pin 8 of the digital potentiometer U2 are both connected to the MCU minimum system, and a pin 3 and a pin 4 of the digital potentiometer U2 are respectively connected to a pin 4 of a microcontroller U3 and a pin 3 of a microcontroller U4.
Further, the MCU minimum system adopts an STM32 series single chip microcomputer.
Furthermore, the 5 pin and the 6 pin of the MCU minimum system are connected with the crystal oscillator Y1 together and then grounded.
Furthermore, the 5 pin and the 6 pin of the MCU minimum system are also connected with the capacitor C3 and the capacitor C2 respectively and then grounded.
Further, the 43 port of the MCU minimum system is a pulse input port and is connected to pin 1 of the microcontroller U3.
Furthermore, a pin 7 of the MCU minimum system is a reset port, and a pin 1 of the MCU minimum system is used to connect to the power supply voltage VCC.
Further, the 12 pins and the 13 pins of the MCU minimum system are respectively connected to the 5 pins and the 8 pins of the digital potentiometer U2.
Furthermore, the pin 7 of the digital potentiometer U2 is left vacant, and the pin 6 and the pin 2 of the digital potentiometer U2 are connected and then are grounded together.
Further, the signal detection circuit is an analog detection circuit.
Compared with the prior art, the invention has the beneficial effects that: the invention adopts the signal detection circuit to detect the pulse width of the target return signal in real time, then reads the pulse width information fed back by the target from the signal detection circuit through the MCU minimum system, judges and controls the narrow pulse circuit to generate the proper semiconductor driving pulse width, can realize the driving mode of completely self-adaptively adjusting the narrow pulse width, and can improve the overall precision of the miniature laser range finder.
Drawings
FIG. 1 is a schematic block diagram of a programmable adaptive narrow pulse drive circuit suitable for high precision ranging;
FIG. 2 is a circuit schematic of the narrow pulse generation circuit of the present invention;
FIG. 3 is a circuit schematic of the MCU control circuit of the present invention;
fig. 4 is a circuit schematic of the MCU minimum system of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the protection scope of the present invention.
A program-controlled self-adaptive narrow pulse driving circuit suitable for high-precision distance measurement comprises a signal detection circuit for detecting the pulse width of a target return signal in real time, wherein the signal detection circuit outputs data information adaptive to the reflectivity after the reflectivity of an external target changes, the driving circuit further comprises an MCU minimum system, an MCU control circuit and a narrow pulse generation circuit, the signal detection circuit, the MCU minimum system, the MCU control circuit and the narrow pulse generation circuit are sequentially connected, the MCU minimum system reads pulse width information fed back by the target from the signal detection circuit and judges the pulse width information, and the MCU control circuit changes parameters to influence the narrow pulse generation circuit to generate a proper semiconductor driving pulse width, as shown in figure 1.
As shown in fig. 2, the narrow pulse generating circuit includes microcontroller U3, microcontroller U4 and driving chip U5, pin 1 and pin 3 of microcontroller U3 are connected to the ground after capacitor C15 and pin 1 of microcontroller U3 is also connected to the MCU minimum system, pin 5 of microcontroller U3, pin 5 of microcontroller U4 and pin 1 of driving chip U5 are all connected to the supply voltage VCC, pin 6 of microcontroller U3 is connected to pin 1 of microcontroller U4 via resistor R9, pin 1 of microcontroller U4 is connected to the ground via capacitor C12, pin 3 of microcontroller U4 is connected to the ground after capacitor C16, pin 3 of microcontroller U4 and pin 4 of microcontroller U3 are both connected to the MCU control circuit, pin 4 of microcontroller U4 is connected to pin 4 of driving chip U4 via resistor R4, pin 6 of microcontroller U4 is connected to pin 3 of driving chip U4 via resistor R4, pin 6 of driving chip U4 and pin 3 of driving chip U4 are connected to the ground and pin C4 and pin 4 are connected to the capacitor C4, a pin 1 of the driving chip U5 is grounded through a capacitor C13, a pin 2 of the driving chip U5 is grounded, a pin 5 and a pin 6 of the driving chip U5 are jointly used as pulse output ports for generating proper semiconductor driving pulse width, a narrow pulse generating circuit is an important circuit for improving the precision of semiconductor laser, and the narrower the driving pulse width of laser emission is, the more stable the laser is, and the more stable the acquisition precision is.
The MCU control circuit is controlled by the MCU minimum system and is configured to change the driving pulse width of the narrow pulse generating circuit, as shown in fig. 3, the MCU control circuit includes a digital potentiometer U2, pin 1 of the digital potentiometer U2 is connected to the supply voltage VCC, pins 5 and 8 of the digital potentiometer U2 are both connected to the MCU minimum system, pins 3 and 4 of the digital potentiometer U2 are connected to pin 4 of the microcontroller U3 and pin 3 of the microcontroller U4, respectively, and the narrow pulse generating circuit controls the digital potentiometer to generate different narrow pulse widths by using the MCU minimum system to control the difference in resistance between the ROUT + and ROUT-ports of the digital potentiometer.
The MCU minimum system is the core of the circuit, and judges and controls the narrow pulse circuit to generate a proper semiconductor driving pulse width after reading the pulse width information fed back by the target from the signal detection, as shown in fig. 4, in this embodiment, the MCU minimum system employs an STM32 series single chip microcomputer, preferably STM32F101CBT 6.
Further optimizing the scheme, the 5 pin and the 6 pin of the MCU minimum system are connected with the crystal oscillator Y1 together and then grounded.
Further optimizing the scheme, the 5 pin and the 6 pin of the MCU minimum system are respectively connected with the capacitor C3 and the capacitor C2 and then grounded.
Further optimizing the scheme, the 43 port of the MCU minimum system is a pulse input port and is connected with a pin 1 of a microcontroller U3.
Further optimizing this scheme, 7 feet of MCU minimum system are the port that resets, and 1 foot of MCU minimum system is used for connecting supply voltage VCC.
Further optimizing the scheme, the 12 pins and the 13 pins of the MCU minimum system are respectively connected to the 5 pins and the 8 pins of the digital potentiometer U2.
According to the scheme, the pin 7 of the digital potentiometer U2 is empty, and the pin 6 and the pin 2 of the digital potentiometer U2 are connected and then are grounded together.
Further optimize this scheme, signal detection circuit is simulation detection circuit, and signal detection circuit uses AD to gather the waveform signal and feeds back to MCU.
When the semiconductor laser range finder is used for measurement, if the reflectivity of a target is high and a reflected signal is too strong, the acquisition pulse width of a signal acquisition circuit is large, the precision of a target distance value is greatly influenced, and the measurement precision can be effectively improved by properly reducing the narrow driving pulse width; if the target reflectivity is low and the reflected signal is greatly weakened, the signal acquisition difficulty is increased, even the distance cannot be read, and the effective signal reading can be improved by properly increasing the pulse width. The invention detects the target signal through the signal detection circuit, the MCU minimum system reads the pulse width and adjusts the narrow pulse generating circuit through the MCU control circuit to generate the proper semiconductor driving pulse width, thereby realizing the optimized driving mode of the laser and improving the overall distance measurement precision.
The invention is applied to the existing semiconductor laser driving circuit, tests are carried out under various environments, a driving mode of fully self-adapting adjustment of narrow pulse width is realized, and the overall precision of the miniature laser distance measuring machine can be improved through effective verification.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A program-controlled self-adaptive narrow pulse driving circuit suitable for high-precision distance measurement comprises a signal detection circuit for detecting the pulse width of a target return signal in real time, and is characterized in that: the MCU minimum system reads pulse width information fed back by a target from the signal detection circuit and then judges the pulse width information and controls the narrow pulse generation circuit to generate a proper semiconductor driving pulse width;
the narrow pulse generating circuit comprises a microcontroller U3, a microcontroller U4 and a driving chip U5, wherein a pin 1 and a pin 3 of the microcontroller U3 are connected to a capacitor C15 and then grounded, a pin 1 of the microcontroller U3 is also connected with a MCU minimum system, a pin 5 of the microcontroller U3, a pin 5 of the microcontroller U4 and a pin 1 of the driving chip U5 are all connected to a power supply voltage VCC, a pin 6 of the microcontroller U3 is connected to a pin 1 of the microcontroller U4 through a resistor R9, a pin 1 of the microcontroller U4 is grounded through a capacitor C12, a pin 3 of the microcontroller U4 is grounded through a capacitor C16, a pin 3 of the microcontroller U4 and a pin 4 of the microcontroller U3 are both connected to an MCU control circuit, a pin 4 of the microcontroller U4 is connected to a pin 4 of the driving chip U4 through a resistor R4, a pin 6 of the microcontroller U4 is connected to a pin 3 of the driving chip U4 through a resistor R4, and a pin 3 of the capacitor U4 are connected with a pin C4 and a pin 4, a pin 1 of the driving chip U5 is grounded through a capacitor C13, a pin 2 of the driving chip U5 is grounded, and a pin 5 and a pin 6 of the driving chip U5 are jointly used as pulse output ports and used for generating proper semiconductor driving pulse width;
the MCU control circuit comprises a digital potentiometer U2, wherein a pin 1 of the digital potentiometer U2 is connected with a power supply voltage VCC, a pin 5 and a pin 8 of the digital potentiometer U2 are both connected to the MCU minimum system, and a pin 3 and a pin 4 of the digital potentiometer U2 are respectively connected to a pin 4 of a microcontroller U3 and a pin 3 of a microcontroller U4.
2. The programmable adaptive narrow pulse driving circuit suitable for high precision ranging according to claim 1, wherein: and the MCU minimum system adopts an STM32 series single chip microcomputer.
3. The programmable adaptive narrow pulse driving circuit suitable for high precision ranging according to claim 2, wherein: and 5 pins and 6 pins of the MCU minimum system are connected with a crystal oscillator Y1 together and then grounded.
4. The programmable adaptive narrow pulse driving circuit suitable for high precision ranging according to claim 3, wherein: and the 5 pin and the 6 pin of the MCU minimum system are also connected with a capacitor C3 and a capacitor C2 respectively and then grounded.
5. The programmable adaptive narrow pulse driving circuit suitable for high precision ranging according to claim 4, wherein: the 43 port of the MCU minimum system is a pulse input port and is connected with a pin 1 of a microcontroller U3.
6. The programmable adaptive narrow pulse driving circuit suitable for high precision ranging according to claim 5, wherein: and a pin 7 of the MCU minimum system is a reset port, and a pin 1 of the MCU minimum system is used for connecting a power supply voltage VCC.
7. The programmable adaptive narrow pulse driving circuit suitable for high precision ranging according to claim 6, wherein: the 12 and 13 pins of the MCU minimum system are connected to the 5 and 8 pins of a digital potentiometer U2, respectively.
8. The programmable adaptive narrow pulse driving circuit suitable for high precision ranging according to claim 7, wherein: the pin 7 of the digital potentiometer U2 is empty, and the pin 6 and the pin 2 of the digital potentiometer U2 are connected and then are grounded together.
9. The programmable adaptive narrow pulse driving circuit suitable for high precision ranging according to claim 1, wherein: the signal detection circuit is an analog detection circuit.
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| CN202010467805.2A CN111474550B (en) | 2020-05-28 | 2020-05-28 | Program-controlled self-adaptive narrow pulse driving circuit suitable for high-precision ranging |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19990069210A (en) * | 1998-02-05 | 1999-09-06 | 이-렌 라이 | How to increase your laser rangefinder |
| US20100045964A1 (en) * | 2008-08-21 | 2010-02-25 | Jinhua Lanhai Photoelectricity Technology Co.,Ltd. | Apparatus and Method for Laser Ranging |
| CN101852851A (en) * | 2010-04-02 | 2010-10-06 | 中国科学院上海技术物理研究所 | Gain-variable trans-impedance amplifier integrated circuit for pulse laser range finder echo receiver |
| CN103227413A (en) * | 2013-04-28 | 2013-07-31 | 中国科学院半导体研究所 | Semiconductor laser device driving circuit |
| CN108872967A (en) * | 2018-05-15 | 2018-11-23 | 天津杰泰高科传感技术有限公司 | Laser radar narrow-pulse generation circuit and method |
| CN212515024U (en) * | 2020-05-28 | 2021-02-09 | 洛阳顶扬光电技术有限公司 | Program-controlled self-adaptive narrow pulse driving circuit suitable for high-precision distance measurement |
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2020
- 2020-05-28 CN CN202010467805.2A patent/CN111474550B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19990069210A (en) * | 1998-02-05 | 1999-09-06 | 이-렌 라이 | How to increase your laser rangefinder |
| US20100045964A1 (en) * | 2008-08-21 | 2010-02-25 | Jinhua Lanhai Photoelectricity Technology Co.,Ltd. | Apparatus and Method for Laser Ranging |
| CN101852851A (en) * | 2010-04-02 | 2010-10-06 | 中国科学院上海技术物理研究所 | Gain-variable trans-impedance amplifier integrated circuit for pulse laser range finder echo receiver |
| CN103227413A (en) * | 2013-04-28 | 2013-07-31 | 中国科学院半导体研究所 | Semiconductor laser device driving circuit |
| CN108872967A (en) * | 2018-05-15 | 2018-11-23 | 天津杰泰高科传感技术有限公司 | Laser radar narrow-pulse generation circuit and method |
| CN212515024U (en) * | 2020-05-28 | 2021-02-09 | 洛阳顶扬光电技术有限公司 | Program-controlled self-adaptive narrow pulse driving circuit suitable for high-precision distance measurement |
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