CN111740302A - Laser stable output system and method of line laser camera laser generator - Google Patents
Laser stable output system and method of line laser camera laser generator Download PDFInfo
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- CN111740302A CN111740302A CN202010538014.4A CN202010538014A CN111740302A CN 111740302 A CN111740302 A CN 111740302A CN 202010538014 A CN202010538014 A CN 202010538014A CN 111740302 A CN111740302 A CN 111740302A
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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
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
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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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Abstract
The invention discloses a laser stable output system and a method of a laser generator of a line laser camera, belonging to the technical field of industrial cameras, wherein the system comprises a laser emitting module, a laser junction voltage acquisition module, an MCU (microprogrammed control unit) and a laser junction current control module; the input end of the laser junction voltage acquisition module is connected with the laser emission module, and the output end of the laser junction voltage acquisition module is connected with the input end of the MCU; the output end of the MCU is connected with the input end of the laser junction current control module, and the output end of the laser junction current control module is connected with the laser emitting module. The system can collect the junction voltage of the laser generator in real time, calculate the formula P U I, adjust the junction current according to the calculation result, maintain the constant light intensity output of the laser generator, realize self-compensation, eliminate the influence of temperature fluctuation on the emission light intensity of the laser generator, and improve the stability of the whole measurement result.
Description
Technical Field
The invention belongs to the technical field of industrial cameras, and particularly relates to a laser stable output system and method of a laser generator of a line laser camera.
Background
The line laser camera uses laser beam as light source, and the laser beam generated from the laser generator is transmitted on the film after being refracted by the lens system of the camera, so as to obtain the image of the object to be detected, thereby realizing industrial detection. The intensity of the laser emitted by the laser generator plays a crucial role in obtaining accurate and stable detection results. Therefore, in practical industrial applications, the light emitting power of the laser generator needs to be adjusted to meet specific industrial requirements.
Chinese utility model patent CN208939333U (a laser luminous power regulating circuit), an operational amplifier U1A, a current adjusting tube Q1, a sampling resistor R4, a diode D1 and a laser power supply source VLaser, etc. are adopted, a circuit capable of regulating laser luminous power is designed, a DAout signal is connected to a positive phase input end of the operational amplifier U1A, a gate of Q1 is connected to an output end of U1A, a drain of Q1 is connected to a laser power supply terminal interface 2, VLaser is connected to the laser power supply terminal interface 1, D1 is connected between the drain of VLaser and Q1, a drain of Q1 is connected to a positive electrode of D1, a drain of VLaser is connected to a negative electrode of D1, a source of Q1 is grounded through the sampling resistor R4, a node between the source of Q1 and the sampling resistor R4 is connected to a negative phase input end of the operational amplifier. In the circuit, a control command is remotely sent to the camera, a DAout signal is obtained after signal conversion, the change of the DAout signal can be fed back to U1A and Q1 in real time, so that the voltage applied to the laser is changed, and the light emitting power of the laser can be adjusted. In the technology of the patent, the remote control signal can be adjusted to ensure the stability of the light emitting power of the laser, and how to obtain the DAout signal needs another set of circuit to complete, so the circuit cannot independently complete the function of adjusting the light emitting power of the laser.
The input voltage of a laser generator of a traditional line laser camera is fixed during working, and the temperature of the laser generator can rise along with the temperature rise of the whole machine during long-time working of equipment. The temperature rise of the laser generator can cause the reduction of the laser junction voltage, cause the attenuation of the laser intensity and influence the stability of the measurement result of the whole machine, so that certain measures need to be taken to ensure the stability of the luminous power of the line laser generator.
The invention patent application CN10366812A (an adaptive control method for laser optical power based on MCU) of china establishes communication between MCU control unit and upper computer, sets adaptive control mode through upper computer for laser bias current adjustment or laser optical power adjustment, when laser optical power adjustment is adopted, MCU control unit performs adaptive control according to target luminous power value set by upper computer and actual luminous power value sampled by laser; when the laser bias current is adjusted, the MCU control unit carries out self-adaptive control according to a target bias current value set by the upper computer and an actual bias current value sampled by the laser. An APC (adaptive control of light power) system controls the light emission power of a laser by self-use adjustment according to changes in parameters such as ambient temperature, so that the light emission power of the laser is constantly maintained at a set value. The method does not need to adjust a hardware circuit, but the method for self-adaptive control is complex and has higher requirement on software design; meanwhile, the patent method does not show how to accurately acquire voltage, current, power signals and the like of the laser, and hardware equipment needs to be designed in actual industrial application.
Therefore, it can be seen that there is no technical solution for adjusting the light emitting power of the line laser generator to be constant in real time according to the circuit design of the line laser camera laser generator in the prior art.
Disclosure of Invention
The invention aims to solve the technical problems that in the prior art, when the luminous power of a laser generator of a line laser camera is ensured to be stable, an adjusting method is complex, and a targeted hardware design circuit is not provided.
In order to solve the technical problem, the invention discloses a laser stable output system of a laser generator of a line laser camera, which comprises a laser emitting module, a laser junction voltage acquisition module, an MCU (microprogrammed control unit) and a laser junction current control module;
the input end of the laser junction voltage acquisition module is connected with the laser emission module, and the output end of the laser junction voltage acquisition module is connected with the input end of the MCU;
the output end of the MCU is connected with the input end of the laser junction current control module, and the output end of the laser junction current control module is connected with the laser emitting module.
Further, the laser stable output system of the line laser camera laser generator further comprises an analog-to-digital conversion module and a digital-to-analog conversion module.
Furthermore, the analog-to-digital conversion module is positioned between the laser junction voltage acquisition module and the MCU.
Furthermore, the digital-to-analog conversion module is positioned between the MCU and the laser junction current control module.
Furthermore, the digital-to-analog conversion module is positioned between the MCU and the laser junction current control module.
Furthermore, the laser junction voltage acquisition module comprises an operational amplifier.
Furthermore, the output end of the operational amplifier in the laser junction voltage acquisition module is connected with the input end of the analog-to-digital conversion module.
Furthermore, the laser junction current control module comprises an operational amplifier.
Furthermore, the output end of the digital-to-analog conversion module is connected with the input end of an operational amplifier in the laser junction current control module.
The invention also claims a laser stable output method of the line laser camera laser generator, which comprises the steps of collecting the junction voltage of the laser generator in real time and then adjusting the junction current.
Further, the method uses the laser stabilized output system.
In the laser stabilized output system of the laser generator of the online laser camera, the laser emission module comprises a diode D1, and the anode of the diode D1 is connected with a power supply-VCC.
The laser junction voltage acquisition module further comprises a power supply-VCC, a resistor R1, a resistor R2, a resistor R3 and a resistor R4; the anode 1 pin of the diode D1 is connected with the resistor R1, the other end of the resistor R1 is connected with the resistor R3 and the positive phase input end 3 pin of the operational amplifier in the laser junction voltage acquisition module, and the other end of the resistor R3 is grounded; a cathode pin 2 of the diode D1 is connected with a resistor R2, the other end of the resistor R2 is connected with a resistor R4 and a pin 2 of a negative phase input end of an operational amplifier in the laser junction voltage acquisition module, and the other end of the resistor R4 is connected with a pin 1 of an output end of the operational amplifier in the laser junction voltage acquisition module; the 4 pins of the operational amplifier in the laser junction voltage acquisition module are connected with a power supply-VCC, and the 11 pins are grounded.
The output end of the digital-to-analog conversion module is connected with a pin 3 at the positive phase input end of an operational amplifier in the laser junction current control module.
The laser junction current control module further comprises a resistor R5, a resistor R6, a resistor R7, a power supply VCC and an MOS tube Q1; the negative phase input end 2 pin of the operational amplifier in the laser junction current control module is connected with a resistor R6, the other end of the resistor R6 is connected with a resistor R7 and a source electrode 3 pin of an MOS tube Q1, the other end of the resistor R7 is grounded, a drain electrode 2 pin of an MOS tube Q1 is connected with a cathode 2 pin of a diode D1 in the laser emission module, a grid electrode 1 pin of the MOS tube Q1 is connected with a resistor R5, the other end of the resistor R5 is connected with an output end 1 pin of the operational amplifier in the laser junction current control module, the operational amplifier in the laser junction current control module is grounded at 4 pins, and a power supply-VCC is connected at 11 pins.
Furthermore, the MOS tube is an NMOS tube.
The working process of using the laser stabilization output system of the line laser camera laser generator to adjust the power of the laser generator is as follows:
1. the MCU sets the initial working current I of the laser emitting diode by controlling the digital-to-analog conversion module;
2. the junction voltage of the laser emitting diode is converted into a signal acceptable by the analog-to-digital conversion module through the junction voltage acquisition module;
3. the MCU collects the junction voltage U of the laser emitting diode in real time through the analog-to-digital conversion module;
4. the MCU calculates the output power P of the laser emitting diode through P ═ U ═ I;
5. as the operating time of the line laser apparatus increases, the temperature of the laser generator increases in response to the temperature of the apparatus.
6. And the MCU judges that the value of P is reduced, and at the moment, the P reaches an initial setting state through regulating and controlling the I.
Specifically, the working process is as follows:
1. MCU sets up emitting diode D1's in the laser emission module initial operating current I1 through digital-to-analog conversion module, specifically is setting up MCU's output voltage U1, sets up initial operating current I1, and line laser equipment begins normal work, and specific setting process includes:
(1) the MCU controls the digital-to-analog conversion module to enable the digital-to-analog conversion module to output binary data of voltage U1 to be QDATA 1;
(2) the voltage of an operational amplifier in the laser junction current control module is lower than that of a pin 3 (U1) at first, and the output voltage of the pin 1 is close to VCC;
(3) q1 is an N-channel field effect transistor, when the voltage difference between pin 1 and pin 3 of the operational amplifier in the laser junction current control module is larger than GS starting voltage, the current flows from VCC to GND through D1, Q1 and R7;
(4) due to the high impedance characteristic of the operational amplifier input, the voltage U2 is U3; so U2 ═ U3 ═ I1 × R7;
(5) when U1 < U3, the Rds of Q1 increases and I1 also decreases to 0;
(6) final U1 ═ U3, i.e., I1 ═ U1/R7; by setting U1, the initial operating current I1 can be set.
2. The laser junction voltage acquisition module acquires the junction voltage of the emitting diode D1, the voltage difference VF between the pin 1 and the pin 2 of the D1 is subtracted by an operational amplifier in the laser junction voltage acquisition module, amplified and then input to the analog-to-digital conversion module, and converted into a signal acceptable by the MCU through the analog-to-digital conversion module;
3. the MCU reads the DATA of the analog-to-digital conversion module at a fixed period, and converts the voltage VF of the emitting diode D1 into binary DATA DATA1 in real time;
4. as the working time of the line laser equipment is prolonged, the temperature of the laser generator can be increased along with the temperature rise of the equipment; d1 is not gradually increased in temperature in the continuous working process, see FIG. 1, in the case that D1 is not changed in current and is increased in temperature, VF is reduced; at this time, the output power P (P ═ VF × I1) of D1 decreases;
6. at this time, the MCU reads the DATA of the adc module 3 as DATA2, and the MCU determines that DATA2< DATA 1;
7. the MCU adjusts the output voltage U1 'of the DAC module, the binary DATA of the DAC module is QDATA2, QDATA2 is the new DAC module binary value calculated by the MCU through DATA1 and DATA2, QDATA2> QDATA1, i.e. U1' > U1;
8. by adjusting U1, since the value of resistor R7 is unchanged, the value of I1 can be further adjusted so that the output power P of D1 (P is VF × I1) becomes equal to the value set initially.
The laser stable output system and the method of the line laser camera laser generator can acquire the junction voltage and the junction current of the laser generator in real time, and adjust the junction current through the calculation result, so that the laser generator maintains constant light intensity output, the influence of temperature fluctuation on the light intensity of the laser generator is eliminated, and the stability of the measurement result of the whole machine is improved.
Compared with the prior art, the laser stable output system and the method of the laser generator of the line laser camera have the following advantages that:
(1) the junction voltage of the laser generator is collected in real time, the output power of the laser generator is calculated by the MCU through P ═ U × I, the laser generator maintains constant light intensity output by adjusting the junction current, the influence of temperature fluctuation on the light intensity of the laser generator is eliminated, and the stability of the measurement result of the whole machine is improved; the system can realize self-compensation, the whole process is closed-loop operation, and the reliability is stronger.
(2) The system has simple circuit design and strong operability in industry.
Drawings
FIG. 1: the effect of laser generator temperature rise on laser junction voltage.
FIG. 2: the line laser camera laser generator has a laser stable output system structure schematic diagram.
Description of reference numerals: 1-a laser emission module; 2-laser junction voltage acquisition module; 3, an analog-to-digital conversion module; 4-MCU; 5-a digital-to-analog conversion module; 6-laser junction current control module.
Detailed Description
The technical solution of the present invention will be described in detail by the following specific examples.
By measuring junction voltage V of laser generator in real time during normal operationFJunction current IFAnd the temperature T of the laser generatorcaseObtaining V of the laser generatorFJunction current IFAnd the temperature T of the laser generatorcaseThe relationship between them, as shown in FIG. 1, can be seen as the laser generator temperature TcaseRise of (V) the junction voltage of the laser generatorFAnd is significantly reduced.
Fig. 2 is a schematic structural diagram of a laser stabilized output system of a laser generator of a line laser camera, in which a laser junction voltage acquisition module 2: the laser junction voltage is extracted and amplified; the analog-to-digital conversion module 3: converting the analog signal into a digital signal; MCU: a control unit; the digital-to-analog conversion module 5: converting the digital signal into an analog signal; laser junction current control module 6: controlling the junction current of the laser emitting diode during working; laser emission module 1: a laser emitting device; MCU 4: a control unit.
The laser stable output system of the line laser camera laser generator comprises a laser emitting module 1, a laser junction voltage acquisition module 2, an analog-to-digital conversion module 3, an MCU4, a digital-to-analog conversion module 5 and a laser junction current control module 6; the input end of the laser junction voltage acquisition module 2 is connected with the laser emission module 1, and the output end is connected with the input end of the MCU 4; the output end of the MCU4 is connected with the input end of the laser junction current control module 6, and the output end of the laser junction current control module 6 is connected with the laser emitting module 1. The analog-to-digital conversion module 3 is positioned between the laser junction voltage acquisition module 2 and the MCU 4; the digital-to-analog conversion module 5 is located between the MCU4 and the laser junction current control module 6.
The laser emitting module 1 comprises a diode D1, and the anode of the diode D1 is connected with a power supply VCC.
The laser junction voltage acquisition module 2 comprises an operational amplifier IC1, a power supply-VCC, a resistor R1, a resistor R2, a resistor R3 and a resistor R4; the anode 1 pin of the diode D1 is connected with the resistor R1, the other end of the resistor R1 is connected with the resistor R3 and the positive phase input end 3 pin of the operational amplifier IC1, and the other end of the resistor R3 is grounded; a cathode pin 2 of the diode D1 is connected with a resistor R2, the other end of the resistor R2 is connected with a resistor R4 and a pin 2 of a negative phase input end of an operational amplifier IC1, and the other end of the resistor R4 is connected with a pin 1 of an output end of the operational amplifier IC 1; the 4 pin of the operational amplifier IC1 is connected to the power supply VCC, and the 11 pin is connected to ground.
In the laser junction voltage acquisition module 2, the output end of the operational amplifier IC1 is connected with the input end of the analog-to-digital conversion module 3.
The laser junction current control module 6 includes an operational amplifier IC 2; the output end of the digital-to-analog conversion module 5 is connected with the pin 3 of the non-inverting input end of the operational amplifier IC 2.
The laser junction current control module further comprises a resistor R5, a resistor R6, a resistor R7, a power supply VCC and an NMOS tube Q1; a negative phase input end 2 pin of the operational amplifier IC2 is connected with a resistor R6, the other end of the resistor R6 is connected with a resistor R7 and a source electrode 3 pin of an NMOS tube Q1, the other end of the resistor R7 is grounded, a drain electrode 2 pin of the NMOS tube Q1 is connected with a negative electrode 2 pin of a diode D1 in the laser emission module, a grid electrode 1 pin of the NMOS tube Q1 is connected with a resistor R5, the other end of the resistor R5 is connected with an output end 1 pin of the operational amplifier IC2, a pin 4 of the operational amplifier IC2 is grounded, and a pin 11 is connected with a power supply VCC.
In this embodiment, the stable laser output method of the laser generator of the line laser camera includes:
1. the MCU4 sets the initial operating current I1 of the emitting diode D1 in the laser emitting module 1 through the digital-to-analog conversion module 5, specifically, sets the output voltage U1 of the MCU4 to set the initial operating current I1, and the line laser device starts to operate normally, the specific setting process includes:
(1) the MCU4 controls the digital-to-analog conversion module 5 to output binary data of the voltage U1 which is converted into digital-to-analog data QDATA 1;
(2) the operational amplifier IC2 initially has a 2-pin voltage lower than the 3-pin (U1), and a 1-pin output voltage close to VCC;
(3) q1 is an N-channel field effect transistor, when the voltage difference between pin 1 and pin 3 of the operational amplifier IC2 is larger than the GS opening voltage, the current flows from VCC to GND through D1, Q1 and R7;
(4) due to the high impedance characteristic of the operational amplifier input, the voltage U2 is U3; so U2 ═ U3 ═ I1 × R7;
(5) when U1 < U3, the Rds of Q1 increases and I1 also decreases to 0;
(6) final U1 ═ U3, i.e., I1 ═ U1/R7; by setting U1, the initial operating current I1 can be set.
2. The laser junction voltage acquisition module 2 acquires the junction voltage of the emitting diode D1, the voltage difference VF between the pin 1 and the pin 2 of the D1 is subjected to difference by the operational amplifier IC1, amplified and then input into the analog-to-digital conversion module 3, and converted into a signal acceptable by the MCU4 by the analog-to-digital conversion module 3;
3. the MCU4 reads the DATA of the analog-to-digital conversion module 3 at a fixed period, and converts the voltage VF of the emitting diode D1 into binary DATA1 in real time;
4. as the working time of the line laser equipment is prolonged, the temperature of the laser generator can be increased along with the temperature rise of the equipment; d1 is not gradually increased in temperature in the continuous working process, see FIG. 1, in the case that D1 is not changed in current and is increased in temperature, VF is reduced; at this time, the output power P (P ═ VF × I1) of D1 decreases;
6. at this time, the MCU4 reads that the DATA of the adc module 3 is DATA2, and the MCU determines that DATA2< DATA 1;
7. the MCU4 adjusts the output voltage U1 'of the dac module 5, and the binary DATA of the dac module 5 is QDATA2, and QDATA2 is a new dac binary value calculated by the MCU4 through DATA1 and DATA2, where QDATA2> QDATA1, i.e., U1' > U1;
8. by adjusting U1, since the value of resistor R7 is unchanged, the value of I1 can be further adjusted so that the output power P of D1 (P is VF × I1) becomes equal to the value set initially.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, so any modifications, equivalents, improvements and the like made within the spirit of the present invention should be included in the scope of the present invention.
Claims (10)
1. The utility model provides a line laser camera laser generator's laser stabilized output system which characterized in that: the device comprises a laser junction voltage acquisition module, a laser junction current control module and an MCU; the output end of the laser junction voltage acquisition module is connected with the input end of the MCU; and the output end of the MCU is connected with the input end of the laser junction current control module.
2. The laser stabilized output system of claim 1, wherein: the device also comprises an analog-digital conversion module and a digital-analog conversion module.
3. The laser stabilized output system of claim 2, wherein: the analog-to-digital conversion module is positioned between the laser junction voltage acquisition module and the MCU.
4. The laser stabilized output system of claim 2, wherein: the digital-to-analog conversion module is positioned between the MCU and the laser junction current control module.
5. The laser stabilized output system of claim 3, wherein: the laser junction voltage acquisition module comprises an operational amplifier.
6. The laser stabilized output system of claim 5, wherein: and the output end of the operational amplifier in the laser junction voltage acquisition module is connected with the input end of the analog-to-digital conversion module.
7. The laser stabilized output system of claim 4, wherein: the laser junction current control module comprises an operational amplifier.
8. The laser stabilized output system of claim 7, wherein: and the output end of the digital-to-analog conversion module is connected with the input end of an operational amplifier in the laser junction current control module.
9. A laser stable output method of a line laser camera laser generator is characterized by comprising the following steps: including collecting junction voltage of the laser generator in real time and then adjusting junction current.
10. The laser stabilized output method of claim 9, wherein: use of a laser stabilized output system as claimed in any one of claims 1 to 8.
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