CN111752317A - Constant temperature control system and control method for laser generator of line laser camera - Google Patents
Constant temperature control system and control method for laser generator of line laser camera Download PDFInfo
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- CN111752317A CN111752317A CN202010573875.6A CN202010573875A CN111752317A CN 111752317 A CN111752317 A CN 111752317A CN 202010573875 A CN202010573875 A CN 202010573875A CN 111752317 A CN111752317 A CN 111752317A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
Abstract
The invention discloses a line laser camera laser constant temperature control system, which is used for collecting diode junction voltage in real time under the condition that a laser passes through constant current based on the relation between the laser emitting diode junction voltage and temperature, and calculating the current temperature through an MCU (microprogrammed control Unit). The MCU controls the refrigerator tightly attached to the laser emitting diode, adjusts the refrigeration power to enable the laser emitting diode to be in a constant temperature state, enables the laser generator to maintain constant light intensity output, eliminates the influence of temperature fluctuation on the light intensity of the laser generator, does not need to introduce a temperature sensor, reduces signal transfer, and is high in control precision; meanwhile, a laser junction current adjusting module is added, the working current of the system can be adjusted according to different application scenes, and the application range of the control system is expanded.
Description
Technical Field
The invention belongs to the technical field of industrial cameras, and particularly relates to a constant temperature control system and a constant temperature control method for a laser generator of a line laser camera.
Background
The laser beam is emitted by the laser generator, and the camera acquires images, so that industrial measurement can be realized. Laser generator can take place the temperature and rise after long-time work, because laser generator temperature rise can lead to the decay of emission light intensity to influence measurement result's stability, consequently need take certain method, make laser generator temperature invariant, and then make the emission light intensity of laser beam invariable, in order to satisfy the industrial demand.
In the chinese patent application CN111045466A (a laser working temperature control circuit and a control method thereof), a circuit is provided, the circuit includes a main control chip, a monitoring circuit, a configuration circuit, a temperature feedback circuit and a laser, a thermistor is provided in the laser, the main control chip is connected to the configuration circuit and the temperature feedback circuit respectively, the monitoring circuit is connected to the configuration circuit, the configuration circuit is connected to the temperature feedback circuit, and the temperature feedback circuit is connected to the built-in thermistor of the laser. The laser is internally integrated with a refrigeration piece, and the refrigeration piece is connected with a configuration circuit. The main control chip in the circuit can rapidly adjust the temperature by setting the resistance value of the adjustable resistor in the temperature feedback circuit, and meanwhile, the main control chip adjusts the maximum output current and the potential difference of the current output end of the configuration circuit, and can also judge whether the state is normal according to the direction and the size of the output current fed back by the monitoring circuit, and if the state is abnormal, the output function of the configuration circuit is closed.
In chinese patent application CN105652918A (a laser temperature control circuit), a refrigerator in thermal contact with a heat sink of a laser, a temperature sensor for monitoring ambient temperature or laser temperature change, and an amplifier circuit for controlling the operating state of the refrigerator are disposed in the circuit, and the amplifier circuit is electrically connected to the temperature sensor and the refrigerator respectively. In the circuit, a temperature sensor monitors the temperature change of the laser or the environment, converts the temperature change into an electric signal, transmits the electric signal to a refrigerator after being processed by an amplifying circuit, and controls the working state of the refrigerator, so that the temperature of the laser is constant within a certain range. In the circuit, the power amplifier sends an electric signal to the refrigerator to control the refrigeration effect of the refrigerator, and particularly, the working current of the refrigerator is adjusted by adjusting the resistance value. In the two patents, the temperature is adjusted by adjusting the resistance value of the adjustable resistor, so that adjustment lag occurs and the stability of the system is affected.
Besides the method, the working temperature of the laser can be collected through a temperature sensor, a PWM signal is generated through a single chip microcomputer, the PWM signal is output to the thermoelectric refrigerator through a driving circuit, and then the working of the thermoelectric refrigerator is controlled. However, in the methods in the prior art, the temperature of the laser needs to be acquired through the temperature sensor, and the accuracy of temperature control is affected after one-time signal conversion; meanwhile, the circuit in the prior art does not include control for the output current of the laser and has no extra circuit control, so that the circuit is only suitable for the situation that the stable laser emits a certain specific constant power, and the application range is narrow.
Disclosure of Invention
The invention aims to solve the technical problems that when the temperature of a laser generator is regulated and controlled in the prior art, the control precision is low, the application range of a designed circuit is narrow, and the like.
In order to solve the technical problem, the invention discloses a constant temperature control system of a laser generator of a line laser camera, which comprises a refrigerator, a laser junction voltage acquisition module, an MCU, a refrigerator refrigerating capacity adjusting module, an analog-to-digital conversion module and a digital-to-analog conversion module, wherein the refrigerator is in contact with the laser generator;
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 refrigerating capacity adjusting module of the refrigerator;
the output end of the refrigerating capacity adjusting module of the refrigerator is connected with the refrigerator;
the analog-to-digital conversion module is positioned between the laser junction voltage acquisition module and the MCU;
the digital-to-analog conversion module is positioned between the MCU and the refrigerating capacity adjusting module of the refrigerator.
Further, the constant temperature control system also comprises a laser junction current regulating module. Furthermore, the input end of the laser junction current regulating module is connected with the output end of the MCU. Furthermore, a digital-to-analog conversion module is arranged between the MCU and the laser junction current regulation module.
Furthermore, operational amplifiers are arranged in the laser junction voltage acquisition module and the refrigerating capacity adjusting module of the refrigerator.
Furthermore, an operational amplifier is arranged in the laser junction current regulating module.
The invention also claims a constant temperature control method of the laser generator of the line laser camera, which comprises the following steps:
(1) the MCU sets the working current I of the laser emitting diode by controlling a digital-to-analog conversion module between the MCU and the laser junction current regulating module and utilizing the laser junction current regulating module;
(2) the junction voltage of the laser emitting diode is converted into a signal U acceptable by the analog-to-digital conversion module through the laser junction voltage acquisition module;
(3) the MCU collects the junction voltage of the laser emitting diode in real time through the analog-to-digital conversion module, and calculates the output power P of the laser emitting diode through P ═ U ═ I;
(4) along with the lengthening of the working time of the line laser equipment, the temperature T of the laser generator can be increased along with the temperature rise of the equipment, so that the junction voltage U is reduced; obtaining the temperature T of the laser generator according to the corresponding relation among the output power P, the working current I and the temperature T of the laser generator;
(5) MCU judges that T value risees, sets up the electric current of refrigerator refrigerating output adjusting module through controlling digital analog conversion module between MCU and the refrigerator refrigerating output adjusting module this moment, and then adjusts the refrigerating output of refrigerator, makes the temperature of laser generator stabilize at the constant temperature.
In the constant temperature control system of the laser generator of the online laser camera, the laser generator is a laser emitting diode, and the anode of the diode 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 is connected with a resistor R1, the other end of the resistor R1 is connected with a resistor R3 and a pin 3 of the positive phase input end of an operational amplifier in the laser junction voltage acquisition module, and the other end of the resistor R3 is grounded; a negative electrode pin 2 of the diode 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 MCU is connected with the laser junction voltage adjusting module through the analog-to-digital conversion module, specifically, a pin 1 at the output end of an operational amplifier in the laser junction voltage collecting module is connected with the input end of the analog-to-digital conversion module, and the output end of the analog-to-digital conversion module is connected with the input end of the MCU; the output end of the MCU is connected with the refrigerating capacity adjusting module of the refrigerator through a digital-to-analog conversion module. Specifically, the refrigerating capacity adjusting module of the refrigerator comprises an operational amplifier, a resistor R8, a resistor R9 and an MOS (metal oxide semiconductor) tube, wherein a positive phase input end 3 pin of the operational amplifier is connected with an output end of the digital-to-analog conversion module, a negative phase input end 2 pin of the operational amplifier is connected with a resistor R8, the other end of the resistor R8 is connected with a resistor R9 and a source electrode 3 pin of the MOS tube, the other end of the resistor R9 is grounded, a drain electrode 2 pin of the MOS tube is connected with the refrigerator, a grid electrode 1 pin of the MOS tube is connected with an output end 1 pin of the operational amplifier, 4 pins of the operational amplifier are connected with a power.
In order to be suitable for different application scenes, the output power of the laser is adjusted, and a laser junction current adjusting module is arranged in the control system. The laser junction current control module comprises an operational amplifier, a pin 3 at the positive phase input end of the operational amplifier is connected with the output end of a digital-to-analog conversion module arranged between the MCU and the laser junction current regulation module, and the laser junction current control module also comprises a resistor R5, a resistor R6, a resistor R7, a power supply-VCC and an MOS tube; 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 (metal oxide semiconductor) tube, the other end of the resistor R7 is grounded, a drain electrode 2 pin of the MOS tube is connected with a cathode 2 pin of a diode in the laser emission module, a grid electrode 1 pin of the MOS tube 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 pin 11 is connected with a power supply-.
In the invention, the MOS tubes used in the laser junction current control module and the refrigerator refrigerating capacity adjusting module are NMOS tubes.
The constant temperature control system and the control method of the laser generator of the line laser camera can acquire the junction voltage of the diode in real time under the condition of passing constant current for the laser based on the relation between the junction voltage of the laser emitting diode and the temperature, and calculate the current temperature through the MCU. The MCU controls the semiconductor refrigeration element tightly attached to the laser emitting diode, adjusts the refrigeration power to enable the laser emitting diode to be in a constant temperature state, enables the laser generator to maintain constant light intensity output, eliminates the influence of temperature fluctuation on the light intensity of the laser generator, and improves the stability of the measuring result of the whole machine.
Compared with the prior art, the line laser camera laser constant temperature control system and the control method have the following advantages:
1. through the voltage of gathering laser generator, according to the corresponding relation between output P, operating current I and the laser generator temperature T, utilize MCU to adjust the refrigeration capacity of refrigerator, eliminate the influence of temperature fluctuation to laser generator light intensity, need not to introduce temperature sensor, reduced the transfer of signal, consequently control accuracy is high.
2. In the control system, a laser junction current adjusting module is added, so that the working current of the system can be adjusted according to different application scenes, and the application range of the control system is expanded.
3. The control method is full-automatic operation and has strong industrial operability.
Drawings
FIG. 1: temperature versus power and current for a laser emitting diode.
FIG. 2: the line laser camera laser generator constant temperature control system structure sketch map.
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; the device comprises a 6-digital-to-analog conversion module, a 7-laser junction current regulation module, an 8-refrigerator refrigerating capacity regulation module and an 11-refrigerator.
Detailed Description
The technical solution of the present invention will be described in detail by the following specific examples.
As shown in fig. 1, giveThe relation curve between the temperature, the power and the current of the laser emitting diode is measured in real time by measuring the junction voltage V of the laser generator in the normal working processFJunction current IFAnd the temperature T of the laser generatorcaseObtaining the output power P of the laser generatoroptJunction 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 TcaseOf the output power P of the laser generatoroptAnd is significantly reduced.
As shown in fig. 2, which shows a schematic structural diagram of a laser thermostatic control system of a line laser camera, the thermostatic control system of a laser generator of the line laser camera can be seen, which comprises a laser emission module 1, a refrigerator 11 in contact with a laser emission diode D1 is arranged in the laser emission module 1, and the anode of the diode D1 is connected with a power supply-VCC;
the laser emitting module 1 is connected with the input end of the laser junction voltage acquisition module 2, and 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 pin 1 of the anode of the diode is connected with a resistor R1, the other end of the resistor R1 is connected with a resistor R3 and a pin 3 of the positive phase input end of an operational amplifier IC1 in the laser junction voltage acquisition module 2, and the other end of the resistor R3 is grounded; a cathode pin 2 of the diode 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 in the laser junction voltage acquisition module 2, and the other end of the resistor R4 is connected with a pin 1 of an output end of an operational amplifier IC1 in the laser junction voltage acquisition module; the pin 4 of the operational amplifier IC1 in the laser junction voltage acquisition module 2 is connected with a power supply-VCC, and the pin 11 is grounded.
The output end 1 pin of the operational amplifier IC1 in the laser junction voltage acquisition module 2 is connected with the input end of the analog-to-digital conversion module 3, and the output end of the analog-to-digital conversion module 3 is connected with the input end of the MCU 4.
The output end of the MCU4 is connected with the refrigerating capacity adjusting module 8 of the refrigerator through the digital-to-analog conversion module 6, the refrigerating capacity adjusting module 8 of the refrigerator comprises an operational amplifier IC3, a resistor R8, a resistor R9 and a MOS tube Q2, the pin 3 at the positive phase input end of the operational amplifier IC3 is connected with the output end of the digital-to-analog conversion module 6, the pin 2 at the negative phase input end of the operational amplifier IC3 is connected with a resistor R8, the other end of the resistor R8 is connected with the pin 3 at the source electrode of the resistor R9 and the pin 3 of the MOS tube Q2, the other end of the resistor R9 is grounded, the pin 2 at the drain electrode of the MOS tube Q2 is connected with the refrigerator, the pin 1 at the grid electrode of the MOS tube Q2 is connected with the pin 1 at the output end.
The output end of the MCU4 is connected with a laser junction current control module 7 through a digital-to-analog conversion module 5, the laser junction current control module comprises an operational amplifier, the pin 3 at the positive phase input end of the operational amplifier is connected with the output end of the digital-to-analog conversion module arranged between the MCU and the laser junction current regulation module, and 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 in the laser emission module, a grid electrode 1 pin of an 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 pin 4, and a pin 11 is connected with a power supply-VCC.
MOS pipe Q1 and MOS pipe Q2 are NMOS pipes.
The method for controlling the constant temperature of the line laser camera laser generator by using the constant temperature control system comprises the following steps:
1. the MCU4 sets the working current I1 of the laser emitting diode by controlling the digital-to-analog conversion module 5 between the MCU4 and the laser junction current adjusting module 7 and utilizing the laser junction current adjusting module 7, and the line laser camera starts to work;
2. the junction voltage of the laser emitting diode D1 is converted into a signal U1 acceptable by the analog-to-digital conversion module 3 through the laser junction voltage acquisition module 2, and the binary data of the corresponding digital-to-analog conversion module 3 is QDATA1, specifically:
(1) IC2 initially has a 2-pin voltage lower than a 3-pin (U1), with a 1-pin output voltage near VCC;
(2) q1 is an N-channel field effect transistor, when the voltage difference between pin 1 and pin 3 is larger than GS opening voltage, current flows from VCC to GND through D1, Q1 and R7;
(3) due to the high impedance characteristic of the operational amplifier input, the voltage U2 is U3; so U2 ═ U3 ═ I1 × R7;
(4) when U1 < U3, the Rds of Q1 increases and I1 also decreases to 0;
(5) final U1 ═ U3, i.e., I1 ═ U1/R7;
3. the MCU4 collects the junction voltage U1 of the laser emitting diode in real time through the analog-to-digital conversion module 3, and calculates the output power P of the laser emitting diode through P ═ U × I;
4. along with the lengthening of the working time of the line laser equipment, the temperature T of the laser generator can be increased along with the temperature rise of the equipment, so that the junction voltage U is reduced; obtaining the temperature T of the laser generator according to the corresponding relation among the output power P, the working current I and the temperature T of the laser generator;
the method specifically comprises the following steps:
(1) the differential pressure VF between the pin 1 and the pin 2 of the D1 is subjected to difference by an operational amplifier IC1, amplified and then input to an analog-to-digital conversion module;
(2) the MCU4 reads the DATA of the analog-to-digital conversion module 3 at a fixed period, and converts the VF voltage of D1 into binary DATA1 in real time;
(3) the temperature of D1 will gradually rise in the continuous working process, and VF will decrease under the condition that the current of D1 is unchanged and the temperature is increased;
(4) at this time, the output power P (P ═ VF × I1) of D1 decreases;
5. the MCU4 judges that the T value rises, at the moment, the current of the refrigerating capacity adjusting module 8 of the refrigerator is set by controlling the digital-to-analog conversion module 6 between the MCU4 and the refrigerating capacity adjusting module 8 of the refrigerator 11, so that the refrigerating capacity of the refrigerator 11 is adjusted, and the temperature of the laser generator is stabilized at a constant temperature;
the method specifically comprises the following steps:
(1) the MCU4 reads that the DATA of the analog-to-digital conversion module 3 is DATA2, and the MCU judges that DATA2< DATA 1;
(2) the MCU4 adjusts the output voltage U2 of the dac module 6, where the binary DATA of the dac module 6 is SDATA, and SDATA is the binary value of the dac module 6 calculated by the MCU4 through DATA1 and DATA 2;
(3) u2 determines the current I2, I2 is U2 × R9, and when I2 increases, the refrigerating power of refrigerator 11 also increases;
(4) the MCU4 adjusts the value of SDATA, i.e., the cooling power of the refrigerator 11, by a specific algorithm, so that the diode D1 temperature, and thus the output power of the laser generator, is constant.
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 (7)
1. The utility model provides a line laser camera laser generator's constant temperature control system which characterized in that: the device comprises a refrigerator, a laser junction voltage acquisition module, an MCU, a refrigerator refrigerating capacity adjusting module, an analog-to-digital conversion module and a digital-to-analog conversion module, wherein the refrigerator is in contact with a laser generator;
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 refrigerating capacity adjusting module of the refrigerator;
the output end of the refrigerating capacity adjusting module of the refrigerator is connected with the refrigerator;
the analog-to-digital conversion module is positioned between the laser junction voltage acquisition module and the MCU;
the digital-to-analog conversion module is positioned between the MCU and the refrigerating capacity adjusting module of the refrigerator.
2. The thermostatic control system of claim 1, wherein: the laser junction current regulation module is further included.
3. The thermostatic control system of claim 2, wherein: and the input end of the laser junction current regulating module is connected with the output end of the MCU.
4. The thermostatic control system of claim 3, wherein: and a digital-to-analog conversion module is arranged between the MCU and the laser junction current regulation module.
5. The thermostatic control system of claim 1, wherein: operational amplifiers are arranged in the laser junction voltage acquisition module and the refrigerating capacity adjusting module of the refrigerator.
6. The thermostatic control system of claim 2, wherein: and an operational amplifier is arranged in the laser junction current regulating module.
7. A constant temperature control method of a laser generator of a line laser camera is characterized by comprising the following steps:
(1) the MCU sets the working current I of the laser emitting diode by controlling a digital-to-analog conversion module between the MCU and the laser junction current regulating module and utilizing the laser junction current regulating module;
(2) the junction voltage of the laser emitting diode is converted into a signal U acceptable by the analog-to-digital conversion module through the laser junction voltage acquisition module;
(3) the MCU collects the junction voltage of the laser emitting diode in real time through the analog-to-digital conversion module, and calculates the output power P of the laser emitting diode through P ═ U ═ I;
(4) along with the lengthening of the working time of the line laser equipment, the temperature T of the laser generator can be increased along with the temperature rise of the equipment, so that the junction voltage U is reduced; obtaining the temperature T of the laser generator according to the corresponding relation among the output power P, the working current I and the temperature T of the laser generator;
(5) MCU judges that T value risees, sets up the electric current of refrigerator refrigerating output adjusting module through controlling digital analog conversion module between MCU and the refrigerator refrigerating output adjusting module this moment, and then adjusts the refrigerating output of refrigerator, makes the temperature of laser generator stabilize at the constant temperature.
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| CN102313610A (en) * | 2010-03-31 | 2012-01-11 | 微软公司 | Be used for the temperature survey and the control of laser and light emitting diode |
| CN102749684A (en) * | 2012-03-26 | 2012-10-24 | 武汉华工正源光子技术有限公司 | Laser transceiving device, manufacturing method thereof and method for improving temperature operation range thereof |
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2020
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| CN1431520A (en) * | 2003-01-14 | 2003-07-23 | 武汉理工大学 | Automatic test system for laser diode |
| CN1905018A (en) * | 2005-07-26 | 2007-01-31 | 联发科技股份有限公司 | Compensation method, temperature detection method and power correction method |
| CN101131828A (en) * | 2006-08-24 | 2008-02-27 | 凌阳科技股份有限公司 | Power controller and power control method for optical disc drive |
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Application publication date: 20201009 |