CN113176556A - Laser energy detection circuit for laser radar equipment - Google Patents
Laser energy detection circuit for laser radar equipment Download PDFInfo
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- CN113176556A CN113176556A CN202110423897.9A CN202110423897A CN113176556A CN 113176556 A CN113176556 A CN 113176556A CN 202110423897 A CN202110423897 A CN 202110423897A CN 113176556 A CN113176556 A CN 113176556A
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- 238000001514 detection method Methods 0.000 title claims abstract description 19
- 230000003750 conditioning effect Effects 0.000 claims abstract description 18
- 230000001105 regulatory effect Effects 0.000 claims abstract description 8
- 239000003990 capacitor Substances 0.000 claims description 13
- 238000010586 diagram Methods 0.000 description 7
- 238000012423 maintenance Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 3
- 230000003321 amplification Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000003199 nucleic acid amplification method 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
- 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
- G01S7/497—Means for monitoring or calibrating
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Optical Radar Systems And Details Thereof (AREA)
- Semiconductor Lasers (AREA)
Abstract
The invention relates to the field of laser energy detection, and discloses a laser energy detection circuit for laser radar equipment, which comprises: the PIN tube mounting plate circuit is mounted at the laser light outlet and used for detecting a stray light signal of laser and generating a voltage signal PIN _ SIG; a coaxial cable line; the signal conditioning circuit amplifies the voltage signal PIN _ SIG to form a voltage signal SIG; the comparison voltage regulating circuit is used for providing comparison voltage Vcomp for the signal comparison output circuit; the signal comparison output circuit is connected with the signal conditioning circuit and the comparison voltage adjusting circuit and used for receiving the voltage signal SIG and the comparison voltage Vcomp; when the amplitude of the voltage signal SIG is larger than the comparison voltage Vcomp, outputting a high-level signal NRG, and calculating the energy value of the laser by detecting the pulse width time of the high-level signal NRG; and a power supply circuit.
Description
Technical Field
The invention relates to the field of laser energy detection, in particular to a laser energy detection circuit for laser radar equipment.
Background
Because the collected signal of the laser radar is most directly related to the laser energy, the laser energy is one of the most direct factors for judging the normal work of the laser radar.
In the existing laser radar equipment, maintenance personnel are required to regularly use a laser energy meter to detect energy changes of laser when the equipment runs, the equipment is ensured to be in a normal running state, the laser energy meter is expensive, the measurement steps are complex, the maintenance personnel are required to carry out measurement on the equipment site, the operation and maintenance cost is high, the real-time performance of data acquisition cannot be ensured, and if the energy of a laser of the equipment fluctuates occasionally, a fault is difficult to detect; if the laser fails to cause laser energy abnormity, the fault information of the laser can be obtained only when the next measurement is carried out, and therefore the maintenance time of equipment is delayed.
Disclosure of Invention
In order to solve the above technical problem, the present invention provides a laser energy detection circuit for a laser radar apparatus.
In order to solve the technical problems, the invention adopts the following technical scheme:
a laser energy detection circuit for a lidar device, comprising:
the PIN tube mounting plate circuit is mounted at the laser light outlet and used for detecting a stray light signal of laser and generating a voltage signal PIN _ SIG;
the coaxial cable is connected with the PIN tube mounting plate circuit and the signal conditioning circuit and transmits a voltage signal PIN _ SIG to the signal conditioning circuit from the PIN tube mounting plate circuit;
the signal conditioning circuit amplifies the voltage signal PIN _ SIG to form a voltage signal SIG;
the comparison voltage regulating circuit is used for providing comparison voltage Vcomp for the signal comparison output circuit;
the signal comparison output circuit is connected with the signal conditioning circuit and the comparison voltage adjusting circuit and used for receiving the voltage signal SIG and the comparison voltage Vcomp; when the amplitude of the voltage signal SIG is larger than the comparison voltage Vcomp, outputting a high-level signal NRG, and calculating the energy value of the laser by detecting the pulse width time of the high-level signal NRG; and
and the power supply circuit provides positive supply voltage + Vamp and negative supply voltage-Vamp for the PIN tube mounting plate circuit, the signal conditioning circuit, the comparison voltage regulating circuit and the signal comparison output circuit.
Further, the PIN tube mounting board circuit comprises resistors R18 and R20, capacitors C20 and C21, a PIN photodiode U8 and an interface P5; one end of the resistor R18 is connected with a positive power supply voltage + Vamp, and the other end of the resistor R18 is connected with one end of the capacitors C20 and C21 and an N PIN of the PIN photodiode U8; the other ends of the capacitors C20 and C21 are grounded; one end of the resistor R20 is connected with a P PIN of the PIN photodiode, and the other end of the resistor R20 is grounded; the P PIN of the PIN photodiode is connected with an interface P5, and generates a voltage signal PIN _ SIG to be transmitted to an interface P5.
Further, the signal conditioning circuit comprises an interface P2, an operational amplifier U6, a potentiometer VR1 and resistors R9 and R13; the interface P2 passes a voltage signal PIN _ SIG to a non-inverting input of an operational amplifier U6; the inverting input end of the operational amplifier is connected with a potentiometer VR1, and the output end of the operational amplifier is connected with the inverting input end through a resistor R9 and is connected with one end of a resistor R13; the other end of the resistor R13 generates a voltage signal SIG.
Further, the comparison voltage regulating circuit comprises a resistor R17, a potentiometer VR2, a relay K1 and a capacitor C13; one end of the resistor R17 is connected with a positive supply voltage + Vamp, and the other end of the resistor R17 is connected with a normally-closed end pin of the potentiometer VR2 and the potentiometer K1; the other end of the potentiometer VR2 is grounded; the output end of the relay K1 is connected with one end of a capacitor C13, and a comparison voltage Vcomp is led out; the other end of the capacitor C13 is grounded.
Further, the analog voltage Vcomp _ Auto and the control signal SW _ Vcomp are also included; the analog voltage Vcomp _ Auto is connected with a normally-open end pin of the relay K1; the control signal SW _ Vcomp controls switching of the relay K1.
Further, the signal comparison output circuit comprises a voltage comparator U9, a resistor R19 and an SMA connector P6; the non-inverting input end VP of the voltage comparator is connected with a voltage signal SIG, the inverting input end VN is connected with a comparison voltage Vcomp, and the output end Q is connected with one end of a resistor R19; the other end of the resistor R19 draws a high-level signal NRG and is connected with the SMA connector P6.
Compared with the prior art, the invention has the beneficial technical effects that:
the laser energy detection device realizes the detection of the laser energy through the circuit system, has low cost compared with a laser energy meter, does not need the field operation of an operator, and can directly measure the laser energy parameter after the system is powered on; the detection circuit can measure the laser energy at any time even if the accidental fault phenomenon of the laser energy occurs; in case the laser breaks down, the unusual data of energy can be transmitted for radar equipment in the very first time and report to the police, is convenient for carry out timely maintenance to equipment.
Drawings
FIG. 1 is a circuit block diagram of the present invention as a whole;
FIG. 2 is a schematic structural diagram of a PIN tube mounting board circuit of the present invention;
FIG. 3 is a schematic diagram of a signal conditioning circuit according to the present invention;
FIG. 4 is a schematic diagram of a comparative voltage regulation circuit according to the present invention;
FIG. 5 is a schematic diagram of a signal comparison output circuit according to the present invention;
FIG. 6 is a schematic diagram of a voltage signal SIG at different laser energies according to the present invention;
FIG. 7 is a diagram of a high level signal NRG with different laser energies according to the present invention.
Detailed Description
A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.
The embodiment provides a laser energy detection circuit for a laser radar apparatus.
As shown in fig. 1, the detection circuit includes a power circuit 1, a PIN tube mounting board circuit 2, a coaxial cable 3, a signal conditioning circuit 4, a comparison voltage adjusting circuit 5, and a signal comparison output circuit 6.
The power supply circuit 1 is responsible for converting an input voltage of 12V into a positive supply voltage + Vamp of positive 5V and a negative supply voltage-Vamp of negative 5V, and providing the positive supply voltage + Vamp and the negative supply voltage-Vamp to other circuits so that the circuits can work normally, which is not described herein.
Fig. 2 is the PIN tube mounting board circuit 2; a PIN photodiode U8 is mounted on the PCB and near the laser exit to detect stray light signals from the laser. The U8 is connected with a reverse voltage of 5V through a current limiting resistor R18, and the reverse voltage can increase a barrier electric field in the PIN photodiode and improve the concentration of holes and electrons in an I-type layer, so that the photoelectric conversion rate of the PIN photodiode is further improved. When the PIN photodiode detects stray light of laser, a weak reverse current signal is formed, flows through the load resistor R20 to form a weak voltage signal PIN _ SIG, and is transmitted to the interface P5. The interface P5 transmits the voltage signal PIN SIG to the interface P2 of the signal conditioning circuit via one of said coaxial cables 3.
Fig. 3 shows the signal conditioning circuit 4, wherein the interface P2 transmits the voltage signal PIN SIG to the non-inverting input of the operational amplifier U6, and U6 is a high-speed operational amplifier, which forms a non-inverting amplifying circuit with the resistor R9 and the potentiometer VR1, and amplifies the voltage signal PIN SIG by a factor of (R9+ VR1)/VR 1; therefore, the amplification factor of the voltage signal PIN _ SIG can be adjusted by adjusting the resistance value of the potentiometer VR1, so that the circuit outputs a voltage signal SIG with a proper size; the amplified voltage signal SIG is transmitted to the signal comparison output circuit through a current limiting resistor R13.
Fig. 4 shows the comparison voltage regulating circuit 5, which is mainly responsible for providing a comparison voltage Vcomp to the voltage comparator U9. Vcomp can be obtained from two sources, one source is that a voltage division circuit consisting of a resistor R17 and a potentiometer VR2 divides a positive power supply voltage + Vamp to obtain Vcomp _ Manual, the voltage value of the Vcomp _ Manual can be adjusted by adjusting the resistance value of the potentiometer VR2, and then the voltage value is transmitted to a normally closed end pin of the relay K1. Another source of Vcomp receives an analog voltage Vcomp _ Auto from the outside, and transmits the voltage to a normally-open terminal pin of a relay K1 through an interface P3. Vcomp _ Manual and Vcomp _ Auto can be switched and selected by a relay K1, the switching of K1 can be controlled by externally connecting a control signal SW _ Vcomp, and the SW _ Vcomp is transmitted to the relay K1 through an interface P3. When no external control signal SW _ Vcomp exists, the relay K1 is connected with Vcomp _ Manual of a pin at a normally closed end by default, comparison voltage Vcomp is output, voltage jitter during relay switching can be filtered by the Vcomp through a filter capacitor C13, and finally the Vcomp is transmitted to a voltage comparator U9.
Fig. 5 shows the signal comparison output circuit 6, the chip U9 is a voltage comparator, the non-inverting input terminal VP of the voltage comparator is connected to the voltage signal SIG, the inverting input terminal VN of the U9 is connected to the comparison voltage Vcomp, when the amplitude of the voltage signal SIG is greater than the comparison voltage Vcomp, the Q terminal of the voltage comparator outputs a fixed high level signal NRG, and the signal NRG is transmitted to the SMA connector P6 through the impedance matching resistor R19.
As shown in fig. 6 and 7, the higher the energy of the laser, the larger the amplitude of the voltage signal SIG and the longer the response time, and at this time, after setting an appropriate comparison voltage Vcomp, the pulse width of the high-level signal NRG output by the voltage comparator U9 will also change accordingly. The higher the energy of the laser, the wider the pulse width of the NRG signal, which is proportional to the laser energy. Therefore, the energy value of the laser can be calculated by detecting the pulse width time of the NGR signal.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (6)
1. A laser energy detection circuit for a lidar apparatus, comprising:
the PIN tube mounting plate circuit is mounted at the laser light outlet and used for detecting a stray light signal of laser and generating a voltage signal PIN _ SIG;
the coaxial cable is connected with the PIN tube mounting plate circuit and the signal conditioning circuit and transmits a voltage signal PIN _ SIG to the signal conditioning circuit from the PIN tube mounting plate circuit;
the signal conditioning circuit amplifies the voltage signal PIN _ SIG to form a voltage signal SIG;
the comparison voltage regulating circuit is used for providing comparison voltage Vcomp for the signal comparison output circuit;
the signal comparison output circuit is connected with the signal conditioning circuit and the comparison voltage adjusting circuit and used for receiving the voltage signal SIG and the comparison voltage Vcomp; when the amplitude of the voltage signal SIG is larger than the comparison voltage Vcomp, outputting a high-level signal NRG, and calculating the energy value of the laser by detecting the pulse width time of the high-level signal NRG; and
and the power supply circuit provides positive supply voltage + Vamp and negative supply voltage-Vamp for the PIN tube mounting plate circuit, the signal conditioning circuit, the comparison voltage regulating circuit and the signal comparison output circuit.
2. The laser energy detection circuit for a lidar apparatus of claim 1, wherein: the PIN tube mounting board circuit comprises resistors R18 and R20, capacitors C20 and C21, a PIN photodiode U8 and an interface P5; one end of the resistor R18 is connected with a positive power supply voltage + Vamp, and the other end of the resistor R18 is connected with one end of the capacitors C20 and C21 and an N PIN of the PIN photodiode U8; the other ends of the capacitors C20 and C21 are grounded; one end of the resistor R20 is connected with a P PIN of the PIN photodiode, and the other end of the resistor R20 is grounded; the P PIN of the PIN photodiode is connected with an interface P5, and generates a voltage signal PIN _ SIG to be transmitted to an interface P5.
3. The laser energy detection circuit for a lidar apparatus of claim 1, wherein: the signal conditioning circuit comprises an interface P2, an operational amplifier U6, a potentiometer VR1 and resistors R9 and R13; the interface P2 passes a voltage signal PIN _ SIG to a non-inverting input of an operational amplifier U6; the inverting input end of the operational amplifier U6 is connected with the potentiometer VR1, and the output end of the operational amplifier U6 is connected with the inverting input end through a resistor R9 and is connected with one end of a resistor R13; the other end of the resistor R13 generates a voltage signal SIG.
4. The laser energy detection circuit for a lidar apparatus of claim 1, wherein: the comparison voltage regulating circuit comprises a resistor R17, a potentiometer VR2, a relay K1 and a capacitor C13; one end of the resistor R17 is connected with a positive supply voltage + Vamp, and the other end of the resistor R17 is connected with a normally-closed end pin of the potentiometer VR2 and the potentiometer K1; the other end of the potentiometer VR2 is grounded; the output end of the relay K1 is connected with one end of a capacitor C13, and a comparison voltage Vcomp is led out; the other end of the capacitor C13 is grounded.
5. The laser energy detection circuit for a lidar apparatus of claim 4, wherein: the analog voltage Vcomp _ Auto and the control signal SW _ Vcomp are also included; the analog voltage Vcomp _ Auto is connected with a normally-open end pin of the relay K1; the control signal SW _ Vcomp controls switching of the relay K1.
6. The laser energy detection circuit for a lidar apparatus of claim 1, wherein: the signal comparison output circuit comprises a voltage comparator U9, a resistor R19 and an SMA joint P6; the non-inverting input end VP of the voltage comparator is connected with a voltage signal SIG, the inverting input end VN is connected with a comparison voltage Vcomp, and the output end Q is connected with one end of a resistor R19; the other end of the resistor R19 draws a high-level signal NRG and is connected with the SMA connector P6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110423897.9A CN113176556B (en) | 2021-04-20 | 2021-04-20 | Laser energy detection circuit for laser radar equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110423897.9A CN113176556B (en) | 2021-04-20 | 2021-04-20 | Laser energy detection circuit for laser radar equipment |
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| CN113176556A true CN113176556A (en) | 2021-07-27 |
| CN113176556B CN113176556B (en) | 2024-04-16 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000051499A (en) * | 1999-01-22 | 2000-08-16 | 윤종용 | Circuit for sensing power of semiconduc- tor laser |
| JP2010175572A (en) * | 2010-05-21 | 2010-08-12 | Seiko Epson Corp | Light detection circuit and automatic dimming circuit |
| CN102507000A (en) * | 2011-10-10 | 2012-06-20 | 武汉华工激光工程有限责任公司 | Detection circuit for output laser energy of laser welding machine |
| CN205067735U (en) * | 2015-08-14 | 2016-03-02 | 重庆邮电大学移通学院 | Laser detection processing circuit |
| CN107255808A (en) * | 2017-07-13 | 2017-10-17 | 西安理工大学 | A kind of narrow pulse peak energy monitor of laser radar outgoing |
| 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 |
| CN110262195A (en) * | 2019-07-11 | 2019-09-20 | 北京科益虹源光电技术有限公司 | A kind of energy detection circuit for excimer laser in 193nm litho machine |
| CN210089851U (en) * | 2019-06-04 | 2020-02-18 | 深圳市联赢激光股份有限公司 | Laser energy monitoring circuit based on pure hardware circuit structure |
-
2021
- 2021-04-20 CN CN202110423897.9A patent/CN113176556B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000051499A (en) * | 1999-01-22 | 2000-08-16 | 윤종용 | Circuit for sensing power of semiconduc- tor laser |
| JP2010175572A (en) * | 2010-05-21 | 2010-08-12 | Seiko Epson Corp | Light detection circuit and automatic dimming circuit |
| CN102507000A (en) * | 2011-10-10 | 2012-06-20 | 武汉华工激光工程有限责任公司 | Detection circuit for output laser energy of laser welding machine |
| CN205067735U (en) * | 2015-08-14 | 2016-03-02 | 重庆邮电大学移通学院 | Laser detection processing circuit |
| 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 |
| CN107255808A (en) * | 2017-07-13 | 2017-10-17 | 西安理工大学 | A kind of narrow pulse peak energy monitor of laser radar outgoing |
| CN210089851U (en) * | 2019-06-04 | 2020-02-18 | 深圳市联赢激光股份有限公司 | Laser energy monitoring circuit based on pure hardware circuit structure |
| CN110262195A (en) * | 2019-07-11 | 2019-09-20 | 北京科益虹源光电技术有限公司 | A kind of energy detection circuit for excimer laser in 193nm litho machine |
Non-Patent Citations (4)
| Title |
|---|
| 冯莉;马彩文;朱少岚;: "激光探测信号处理电路研究", 现代电子技术, no. 15 * |
| 张贵军;: "窄脉冲半导体激光器峰值功率测量方法研究", 微纳电子技术, no. 05 * |
| 王奇 等: "微弱激光能量监测系统的研究", 长春理工大学学报（自然科学版）, vol. 39, no. 2 * |
| 郎建华;李晨希;: "一种基于激光测距的能量探测电路设计", 光电技术应用, no. 03 * |
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