CN113176556B - Laser energy detection circuit for laser radar equipment - Google Patents
Laser energy detection circuit for laser radar equipment Download PDFInfo
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- CN113176556B CN113176556B CN202110423897.9A CN202110423897A CN113176556B CN 113176556 B CN113176556 B CN 113176556B CN 202110423897 A CN202110423897 A CN 202110423897A CN 113176556 B CN113176556 B CN 113176556B
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- 238000001514 detection method Methods 0.000 title claims abstract description 18
- 230000003750 conditioning effect Effects 0.000 claims abstract description 18
- 230000001105 regulatory effect Effects 0.000 claims abstract description 11
- 239000003990 capacitor Substances 0.000 claims description 13
- 238000010586 diagram Methods 0.000 description 7
- 238000012423 maintenance Methods 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 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
- 238000005259 measurement Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
Classifications
-
- 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 following components: the PIN tube mounting plate circuit is arranged at the laser light outlet and used for detecting stray light signals of laser and generating voltage signals PIN_SIG; a coaxial cable; the signal conditioning circuit amplifies the voltage signal PIN_SIG to form a voltage signal SIG; a comparison voltage regulating circuit for providing a 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 regulating circuit and is used for receiving a voltage signal SIG and a 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 laser by detecting the pulse width time of the high-level signal NRG; 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 acquired 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 operation of the laser radar.
In the existing laser radar equipment, maintenance personnel are required to detect the energy change of laser by using a laser energy meter regularly when the equipment operates, so that the equipment is ensured to be in a normal operating state, the laser energy meter is high in price, the measuring step is complex, the maintenance personnel are required to measure the equipment on site, the operation and maintenance cost is high, the instantaneity of data acquisition cannot be ensured, and if the energy of a laser of the equipment fluctuates accidentally, faults are difficult to detect; if the laser fails to cause abnormal energy of the laser, the failure information of the laser can not be obtained until the next measurement, so that the maintenance time of the equipment is delayed.
Disclosure of Invention
In order to solve the technical problems, the invention provides a laser energy detection circuit for laser radar equipment.
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 arranged at the laser light outlet and used for detecting stray light signals of laser and generating voltage signals 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 from the PIN tube mounting plate circuit to the signal conditioning circuit;
the signal conditioning circuit amplifies the voltage signal PIN_SIG to form a voltage signal SIG;
a comparison voltage regulating circuit for providing a 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 regulating circuit and is used for receiving a voltage signal SIG and a 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 laser by detecting the pulse width time of the high-level signal NRG; and
and the power supply circuit is used for providing positive power supply voltage +vamp and negative power 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 positive power supply voltage +vamp, and the other end of the resistor R is connected with one ends of the capacitors C20 and C21 and the 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 the P PIN of the PIN photodiode, and the other end of the resistor R is grounded; the PIN P of the PIN photodiode is connected with the interface P5, and generates a voltage signal pin_sig to be transmitted to the 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 transmits a voltage signal PIN_SIG to a non-inverting input end of the operational amplifier U6; the inverting input end of the operational amplifier is connected with the potentiometer VR1, and the output end of the operational amplifier is connected with the inverting input end through the resistor R9 and one end of the 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 positive power supply voltage +vamp, and the other end of the resistor R is connected with a normally closed end pin of the potentiometer VR2 and a normally closed end pin of 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 the capacitor C13 and leads out the comparison voltage Vcomp; the other end of the capacitor C13 is grounded.
Further, the analog voltage Vcomp_auto and the control signal SW_Vcomp are 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 of the voltage comparator is connected with a comparison voltage Vcomp, and the output end Q of the voltage comparator is connected with one end of a resistor R19; the other end of the resistor R19 is connected to the SMA tap P6, and is connected to the high-level signal NRG.
Compared with the prior art, the invention has the beneficial technical effects that:
the invention 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 operators, and can directly measure the laser energy parameter after the system is electrified; the detection circuit can be used for measuring the laser energy at any time, and even if the accidental fault phenomenon of the laser energy is also measured; once the laser breaks down, the data of energy abnormality can be transmitted to radar equipment at the first time to alarm, so that the equipment can be maintained in time.
Drawings
FIG. 1 is a circuit block diagram of the overall invention;
FIG. 2 is a schematic diagram of the structure of the 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 regulator 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 schematic diagram of the high level signal NRG at different laser energies according to the present invention.
Detailed Description
A preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.
The present embodiment provides a laser energy detection circuit for a laser radar apparatus.
As shown in fig. 1, the detection circuit comprises a power supply circuit 1, a PIN tube mounting plate circuit 2, a coaxial cable 3, a signal conditioning circuit 4, a comparison voltage regulating 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 power supply voltage +vamp of positive 5V and a negative power supply voltage-Vamp of negative 5V, and providing the power supply voltages to other circuits to enable the circuits to work normally, which will not be 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 light exit to detect stray light signals from the laser. U8 is connected with a reverse voltage of 5V through a current limiting resistor R18, and the reverse voltage can increase the barrier electric field in the PIN photodiode and improve the concentration of holes and electrons in the I-type layer, so that the photoelectric conversion rate of the PIN photodiode is further improved. When the PIN photodiode detects stray light of the laser, a weak reverse current signal is formed, and a weak voltage signal PIN_SIG is formed by flowing through the load resistor R20 and is transmitted to the interface P5. Interface P5 transmits voltage signal PIN SIG to interface P2 of the signal conditioning circuit via one of said coaxial cables 3.
Fig. 3 shows the signal conditioning circuit 4, the interface P2 transmits the voltage signal pin_sig to the non-inverting input terminal of the operational amplifier U6, and the U6 is a high-speed operational amplifier, which forms a non-inverting amplifying circuit together 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 proper size; the amplified voltage signal SIG is delivered to the signal comparison output circuit via a current limiting resistor R13.
Fig. 4 shows the comparison voltage regulator circuit 5, which is mainly responsible for providing the voltage comparator U9 with a comparison voltage Vcomp. The Vcomp can have two sources, one source is a voltage dividing circuit consisting of a resistor R17 and a potentiometer VR2, the positive supply voltage +vamp is divided to obtain vcomp_manual, and the voltage value of the vcomp_manual can be adjusted by adjusting the resistance value of the potentiometer VR2 and then transmitted to the normally closed terminal pin of the relay K1. Another source of Vcomp is externally supplied with an analog voltage Vcomp_auto, which is passed to the normally open pin of relay K1 via interface P3. Vcomp_manual and Vcomp_auto can be switched by a relay K1, the switching of K1 can be controlled by an externally connected control signal SW_Vcomp, and 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 normally-closed end pin by default, and outputs comparison voltage Vcomp, and the Vcomp can filter voltage jitter during relay switching through a filter capacitor C13, and finally the Vcomp is transmitted to the 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 the pulse width of the high-level signal NRG output from the voltage comparator U9 will also change after setting a suitable comparison voltage Vcomp. The higher the laser energy, the wider the NRG signal pulse width, which is proportional to the laser energy. Therefore, the energy value of the laser can be calculated by only 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 characteristics 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.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a single embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to specific embodiments, and that the embodiments may be combined appropriately to form other embodiments that will be understood by those skilled in the art.
Claims (6)
1. A laser energy detection circuit for a lidar device, comprising:
the PIN tube mounting plate circuit is arranged at the laser light outlet and used for detecting stray light signals of laser and generating voltage signals 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 from the PIN tube mounting plate circuit to the signal conditioning circuit;
the signal conditioning circuit amplifies the voltage signal PIN_SIG to form a voltage signal SIG;
a comparison voltage regulating circuit for providing a 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 regulating circuit and is used for receiving a voltage signal SIG and a 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 laser by detecting the pulse width time of the high-level signal NRG; and
and the power supply circuit is used for providing positive power supply voltage +vamp and negative power 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 device according to 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 positive power supply voltage +vamp, and the other end of the resistor R is connected with one ends of the capacitors C20 and C21 and the 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 the P PIN of the PIN photodiode, and the other end of the resistor R is grounded; the PIN P of the PIN photodiode is connected with the interface P5, and generates a voltage signal pin_sig to be transmitted to the interface P5.
3. The laser energy detection circuit for a lidar device according to 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 transmits a voltage signal PIN_SIG to a non-inverting input end of the operational amplifier U6; the inverting input end of the operational amplifier U6 is connected with the potentiometer VR1, the output end of the operational amplifier U6 is connected with the inverting input end through a resistor R9, and the output end of the operational amplifier U6 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 device according to 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 positive power supply voltage +vamp, and the other end of the resistor R is connected with a normally closed end pin of the potentiometer VR2 and a normally closed end pin of 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 the capacitor C13 and leads out the comparison voltage Vcomp; the other end of the capacitor C13 is grounded.
5. The laser energy detection circuit for a lidar device according to 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 device according to claim 1, wherein: 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 of the voltage comparator is connected with a comparison voltage Vcomp, and the output end Q of the voltage comparator is connected with one end of a resistor R19; the other end of the resistor R19 is connected to the SMA tap P6, and is connected to the high-level signal NRG.
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 CN113176556A (en) | 2021-07-27 |
| CN113176556B true CN113176556B (en) | 2024-04-16 |
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