CN208423445U - Power stability type solid state laser - Google Patents
Power stability type solid state laser Download PDFInfo
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- CN208423445U CN208423445U CN201821265007.6U CN201821265007U CN208423445U CN 208423445 U CN208423445 U CN 208423445U CN 201821265007 U CN201821265007 U CN 201821265007U CN 208423445 U CN208423445 U CN 208423445U
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Abstract
The utility model discloses a kind of power stability type solid state lasers, the power stability type solid state laser includes the pedestal of circulation cooling water in it, to install the thermally conductive load seat of the optical crystal of the fixed solid state laser, temperature sensor on thermally conductive load seat is set, the semiconductor refrigerating unit driven between thermally conductive load seat and pedestal and by Bipolar current driver is set, and control unit, the utility model is on the basis of traditional temperature control system, construct temperature-current double closed-loop control system, inner ring is the current closed-loop using PI control, outer ring is the temperature closed loop using PID control, the control precision of system is improved with this, it is finally reached the purpose for improving solid state laser power stability.
Description
Technical field
The utility model belongs to field of laser device technology, and in particular to a kind of power stability type solid state laser.
Background technique
Solid state laser has that wavelength is short, absorptivity is high, small in size, can be excellent using optical fiber transmission realization Flexible Manufacture etc.
Point, make it in laser processing using more and more extensive.The country is concentrated mainly on raising function for the research of solid state laser
In terms of rate, and the stability of solid state laser power is also to limit a big factor of its popularization and use, is solid state laser performance
Important indicator.Operation material, that is, optical crystal in solid state laser is easy to produce heat deposition at work so as to cause itself
Temperature change, and then the spectrum of laser output laser, power is caused to generate drift, seriously affect the stabilization of the power of laser
Property.Therefore many domestic solid state lasers are not able to satisfy the demand of industrial applications in terms of stability and reliability, this is just
The development and application of solid state laser are significantly limited, so the stability for improving solid state laser is urgently to be resolved one
Problem.And accurate control is carried out to the operating temperature of its optical crystal, and make its work at a temperature of best match, it is solid for improving
The Performance And Reliability of body laser is of great significance, and domestic solid state laser is also enable to obtain more widely promoting and answer
With.
Keeping the temperature stabilization in the solid state laser course of work is to improve the important method of its power stability.Existing rank
Section, keep the stable effective ways of temperature first is that using temperature control system, including air-cooled, water cooling and refrigerant etc..And it is domestic
The water cooling temperature control system mostly used greatly, the disadvantage is that one side precision is relatively low, be on the other hand there are certain hysteresis quality,
It tends not to timely cool down to the raised solid state laser of temperature.It is therefore desirable to introduce one kind can high efficiency it is high-precision
The temperature control system for realizing that solid state laser temperature is stable of degree, in real time, efficiently keeps temperature steady in laser working process
It is fixed.But since TEC can generate temperature difference T during the work time, to generate thermoelectromotive force, the presence of the electromotive force is in reality
Will affect the effective operating voltage loaded at the both ends TEC in the work of border leads to final temperature to influence its practical operating current
It is not high to control precision.
Utility model content
The purpose of the utility model is to overcome the deficiencies in the prior art, provide a kind of power stability type solid state laser,
The mode that the power stability type solid state laser is combined using semiconductor refrigerating module and circulating water cooling system to optical crystal into
Row cooling is completed to keep its temperature accurately steady the acquisition of optical crystal temperature, analysis, feedback and control based on embedded system
It is scheduled within preset temperature.The device can accomplish real-time, accurate temperature controlling, effectively avoid the hysteresis quality and mistake of traditional temperature-controlling system
Difference generates optical crystal temperature variation curve in real time, improves the power stability of solid state laser to a greater extent.
The utility model is achieved through the following technical solutions:
A kind of power stability type solid state laser, the pedestal including the cooling water that circulates in it, to install described in fixation
The thermally conductive load seat of the optical crystal of solid state laser, be arranged in it is thermally conductive load seat on temperature sensor, setting thermally conductive loads seat with
The semiconductor refrigerating unit and control unit driven between pedestal and by Bipolar current driver,
The control unit includes the microprocessor and current transformer with the temperature sensor communication connection, institute
Electric current output of the current transformer stated to acquire the Bipolar current driver current, the microprocessor and institute
The Bipolar current driver stated controllably connects.
In the above-mentioned technical solutions, the thermally conductive load seat is copper.
In the above-mentioned technical solutions, the thermally conductive load seat is cavate or platform-type structure.
In the above-mentioned technical solutions, the temperature sensor includes temperature sensing unit, is formed with described to position
Temperature sensing unit hollow cavity armouring screw, the armouring screw is threadedly coupled with the thermally conductive load seat.
In the above-mentioned technical solutions, the temperature sensor is thermal resistance sensor, the thermal resistance sensor warp
Microprocessor is connected to after signal amplifier and A/D module, the output of the microprocessor is isolated through D/A module and given value of current
Amplifier is connected to the Bipolar current driver.
In the above-mentioned technical solutions, the microprocessor, current transformer, A/D module, D/A module and given value of current
Isolated amplifier is integrated on same circuit board.
In the above-mentioned technical solutions, the temperature sensor is multiple uniformly distributed or is distributed in optical crystal by predetermined rule
Around multiple.
In the above-mentioned technical solutions, the microprocessor is single-chip microcontroller.
It in the above-mentioned technical solutions, further include the human-computer interaction screen being connect with the microcontroller communication or PC machine.
In the above-mentioned technical solutions, the semiconductor chilling plate is driven by H bridge.
A kind of control method of the power stability type solid state laser, includes the following steps,
1) circulating water cooling system is opened, control coolant-temperature gage is stablized in the range of≤25 DEG C；
2) solid state laser is started to work, and optical crystal temperature gradually rises；Temperature sensor receives temperature change letter
Number and feed back to single-chip microcontroller,
3) temperature signal is analyzed and is handled in single-chip microcontroller, when collected temperature signal is believed higher than preset temperature
Number when, using PID control change PWM duty cycle adjustment driving circuit output effective voltage, control TEC operating current it is big
It is small, make it start to freeze；
4) it acquires practical TEC working current value and is compared with the expection TEC operating current precomputed, calculated through PI
Certain controlling increment is obtained after method operation to compensate TEC operating voltage, thus make TEC work under prospective current, it is real
Now accurately temperature controls.
It the advantages of the utility model and has the beneficial effect that
So the utility model on the basis of traditional temperature control system, constructs temperature-current double-closed-loop control
System, inner ring are using the current closed-loop of PI control, outer ring is the temperature closed loop using PID control, improve system with this
Precision is controlled, the purpose for improving solid state laser power stability is finally reached.
It completes to keep its temperature accurately steady the acquisition of optical crystal temperature, analysis, feedback and control based on embedded system
It is scheduled within preset temperature.The device can accomplish real-time, accurate temperature controlling, effectively avoid the hysteresis quality and mistake of traditional temperature-controlling system
Difference generates optical crystal temperature variation curve in real time, improves the power stability of solid state laser to a greater extent.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model power stability type solid state laser.
It for those of ordinary skill in the art, without creative efforts, can be according to above attached
Figure obtains other relevant drawings.
Specific embodiment
In order to make those skilled in the art better understand the scheme of the utility model, combined with specific embodiments below into one
Step illustrates the technical solution of the utility model.
Embodiment one
The power stability type solid state laser of the utility model, the pedestal including the cooling water that circulates in it are solid to install
The thermally conductive load seat of the optical crystal of the fixed solid state laser, is arranged in the temperature sensor in thermally conductive load seat, and setting is being led
Heat carries between seat and pedestal and by Bipolar current driver, the semiconductor refrigerating of semiconductor chilling plate as mentioned such as H bridge driving
Unit and control unit, wherein the control unit includes the micro process with the temperature sensor communication connection
Device, the current transformer of the output to acquire the Bipolar current driver, the controller with it is described bipolar
Property current driver controllably connects.
Wherein, the temperature sensor that will measure and control optical crystal temperature, such as platinum sensor and TEC semiconductor system
Cold unit is mounted on thermally conductive load seat, and as on copper thermally conductive load seat, which can be cavate or platform-type structure to carry
Optical crystal is positioned, while utilizing the good temperature equalization of thermally conductive load seat, the accuracy of temperature acquisition is able to achieve, using partly leading
Body refrigeration unit carries out heat dissipation and carries out temperature control, by construction isoperibol come the temperature of indirect stable optical crystal.Together
When, on the base and base interior is radiated by cooling water by the setting of thermally conductive load seat.Temperature is measured using platinum resistance, according to
The difference of Current Temperatures and set temperature, control TEC semiconductor chilling plate are freezed and are heated, the ambient side of TEC semiconductor
For the metastable recirculated water of temperature, make the work of its optical crystal at a set temperature.In conjunction with optical crystal temperature change feature
With TEC semiconductor chilling plate working characteristics, temperature control is carried out to it using temperature-current two close cycles temperature control system, is protected
It demonstrate,proves its operating temperature to stablize near setting value, to improve the laser output stability of laser.When system acquisition to solid
When laser optical crystal temperature effect increases, microprocessor (MCU) analyzes temperature collection, and there are difference, outer ring temperature with preset temperature
Closed loop uses PID control, is started to work and is freezed using PWM driving TEC driving circuit；Inner ring current closed-loop uses PI control pair
TEC both end voltage compensates, and flows through TEC electric current to achieve the purpose that adjust, final to realize the higher temperature control of precision.
I.e. collected actual temperature value and set temperature value obtain certain control amount in MCU after pid algorithm operation, the control
Rule is converted to the PWM drive signal with corresponding duty ratio, control Bipolar current driver driving to amount according to a certain percentage
TEC works.Acquire current TEC real work electric current using current transformer simultaneously, the real work electric current in MCU with
The expection TEC operating current precomputed is compared, and obtains certain controlling increment after PI algorithm operation, which increases
Amount compensates the driving voltage at the both ends TEC after being converted to the pwm control signal with certain duty ratio.Wherein, if it is traditional
Conductor temperature control system is controlled only with temperature of the pid control algorithm to controlled device, although can will be by temperature control
Degree stablize within certain accuracy rating, but the temperature control mode have ignored it is non-in the semiconductor cooler course of work
Linear working state, and as its electrical characteristic of temperature change and working efficiency can all change.Therefore, if only to controlled
Object uses PID control, although can stablize its temperature in certain accuracy rating, precision is poor, is unable to satisfy solid
Requirement of the optical crystal for temperature control precision in laser, thus the utility model it is innovative use temperature-current
Double-closed-loop control method and outer ring are adjusted using PID control using temperature as feedback target, inner ring is controlled using PI will
TEC controls electric current as working condition of the feedback target to TEC and carries out linearization process, to reach the temperature control of higher precision
System.
Wherein, it carries out modulating the biasing of metal-oxide-semiconductor grid according to the variation of respective loads when PWM control, be realized with this
The change of metal-oxide-semiconductor turn-on time, to realize the change of switching power supply output.By the width for changing PWM waveform pulse
Or the purpose of pressure regulation may be implemented in duty ratio.This mode can be such that the operating voltage of TEC or TEC controls, and voltage is more accurate not to be examined
In the case where considering other factors) change with solid laser crystal temperature change, it realizes the purpose of TEC heating or refrigeration, is
A kind of very effective technology that analog circuit is controlled using the digital signal of microprocessor.
Embodiment two
Wherein, the temperature sensor includes temperature sensing unit, is formed with to position the temperature sensing list
The armouring screw of the hollow cavity of member, the armouring screw are threadedly coupled with the thermally conductive load seat.The temperature sensor
For thermal resistance sensor, the thermal resistance sensor is connected to microprocessor after signal amplifier and A/D module, and described is micro-
The output of processor is connected to the Bipolar current driver through D/A module and given value of current isolated amplifier.Thermal resistance
Collected current signal is converted into voltage signal with ambient temperature value linear change by the electric current on sensor, due to acquisition
To be millivolt level voltage signal, first amplify through pre-amplifier under the control of single-chip microcontroller, then pass through multi-channel analog turn
It changes switch and reaches the input terminal of A/D converter, then convert analog signals into digital signal through A/D converter, be output to monolithic
It is analyzed and processed in machine, by real-time temperature collection situation of change, obtains one group of temperature curve.
Further, the microprocessor, current transformer, A/D module, D/A module and given value of current isolation amplification
Device is integrated on same circuit board.Microprocessor and acquisition chip, A/D conversion chip, driving circuit etc. are integrated in one piece to open
Send out plate on, can reduction system volume, realize system compact, reduction system volume as far as possible is on space structure to meet entirety
Space layout such as realizes embedded system, and embedded processing systems are the general name of hardware circuit and software systems herein.It is wherein hard
Part circuit mainly includes microprocessor, analogue signal acquisition circuit, A/D conversion chip, H-bridge drive circuit etc..Software systems base
It develops, runs among microprocessor, for completing the communication and control of microprocessor Yu other companion chips in embedded platform
Work processed.
Wherein, the temperature sensor is multiple uniformly distributed or is distributed in by predetermined rule multiple around optical crystal.
Multipoint mode temperature acquisition simultaneously presses certain regularity of distribution mounting temperature sensor around optical crystal, by all temperature sensing
The collected mean temperature approximation of device is as optical crystal temperature.
Embodiment three
As one of specific implementation, the microprocessor is single-chip microcontroller, further includes and the single-chip microcontroller
The human-computer interaction screen or PC machine of communication connection.PC machine is responsible for the configuration and management of each unit, the processing that processing terminal uploads
As a result, simultaneously recording temperature variations in real time.And control result is recorded by serial communication real-time transmission to the end PC,
Experimental data can be converted output, for further analysis and processing by the form of intuitive formation curve figure in a variety of formats at any time.
Example IV
When being worked using solid state laser, acquired, analyzed in real time using utility model device, control solid swash
For light device crystal inside temperature change to improve its power stability, application places are the industrial field using solid state laser
Institute.Specific implementation method are as follows:
1) circulating water cooling system is opened, coolant-temperature gage is stablized in the range of≤25 DEG C；
2) solid state laser is started to work, and optical crystal temperature gradually rises；Temperature sensor receives temperature change letter
Number and feed back to single-chip microcontroller,
3) temperature signal is analyzed and is handled in single-chip microcontroller, see collected optical crystal temperature signal and preset
It whether there is difference signal between temperature signal, the temperature that TEC is adjusted according to the difference signal of generation is to increase also or drop
It is low, it keeps stablizing to control crystal temperature effect；When collected temperature signal is higher than preset temperature signals, single-chip microcontroller is utilized
PID control realizes outer ring temperature feedback, generates PWM drive signal, and TEC starts to work to freeze to cool down to optical crystal.It is logical
The effective voltage for changing the duty cycle adjustment driving circuit output of PWM is crossed, the size of TEC operating current is controlled, it is made to start to make
It is cold；
4) since TEC driving circuit can generate temperature difference at cold and hot both ends at work, to generate thermoelectric in TEC
The value of kinetic potential, the electromotive force changes with temperature, so depositing for the inverse electromotive force will affect the both ends TEC during the work time
Operating voltage will lead to TEC refrigerating capacity in this way and desired value generate deviation, influence system to influence its size of current
Control precision, so at this point, inner ring current feedback start to work, to control voltage V compensate, can be effectively suppressed temperature change
Change the influence to TEC voltage.
5) feedback signal makes the temperature wireless of optical crystal close to preset value to the adjusting of TEC temperature and keeps stable,
Realize high-precision temperature control.
6) the real-time output temperature change curve in the end PC monitors solid state laser temperature change, to improve its power stability,
Increase functional reliability.
Temperature control is realized by PID, and the corresponding control amount of generation is output in TEC driving circuit after being converted into PWM, makes
It is heated or refrigeration；Current control is realized by PI, calculates offset voltage Δ V and the control voltage V at the both ends TEC is mended
It repays, to control the driving TEC work of its electric current, keeps crystal temperature effect accurately stable in set temperature.
In conclusion the utility model has the following beneficial effects:
1, traditional single air-cooled, water-cooling system is replaced using TEC and circulating water cooling system compound form, it can be more
It timely realizes to the feedback of temperature, eliminates hysteresis quality.And TEC volume is smaller, and it, can without slide unit and operating noise
Height is required by property, it is easy to carry, space is saved to a certain extent.
2, using temperature-current double closed-loop control system, temperature controlled precision is greatly improved, interference is eliminated and misses
Difference.
3, be based on thermoelectric cooling (TEC) precision temperature control method, can quickly and effectively realize temperature monitoring and
Control, due to TEC itself temperature control feature, temperature feedback is timely, sluggish small, meets wanting for solid state laser temperature realtime control
Seek
4, embedded temperature acquisition, processing module integrate in terminal, facilitate installation and arrangement.
The spatially relative terms such as "upper", "lower", "left", "right" have been used in embodiment for ease of explanation, have been used for
Relationship of the elements or features relative to another elements or features shown in explanatory diagram.It should be understood that in addition to figure
Shown in except orientation, spatial terminology is intended to include the different direction of device in use or operation.For example, if in figure
Device be squeezed, the element for being stated as being located at other elements or feature "lower" will be located into other elements or feature "upper".
Therefore, exemplary term "lower" may include both upper and lower orientation.Device, which can be positioned in other ways, (to be rotated by 90 ° or position
In other orientation), it can be interpreted accordingly used herein of the opposite explanation in space.
Illustrative description has been done to the utility model above, it should explanation, in the core for not departing from the utility model
In the case where the heart, it is any it is simple deformation, modification or other skilled in the art can not spend creative work etc.
The protection scope of the utility model is each fallen with replacement.
Claims (10)
1. a kind of power stability type solid state laser, which is characterized in that the pedestal including the cooling water that circulates in it, it is solid to install
The thermally conductive load seat of the optical crystal of the fixed solid state laser, is arranged in the temperature sensor on thermally conductive load seat, and setting is being led
The semiconductor refrigerating unit and control unit that heat is carried between seat and pedestal and driven by Bipolar current driver,
The control unit includes the microprocessor and current transformer with the temperature sensor communication connection, described
Electric current output of the current transformer to acquire the Bipolar current driver current, the microprocessor and described
Bipolar current driver controllably connects.
2. a kind of power stability type solid state laser according to claim 1, it is characterised in that: the thermally conductive load seat is
It is copper.
3. a kind of power stability type solid state laser according to claim 1, it is characterised in that: the thermally conductive load seat is
Cavate or platform-type structure.
4. a kind of power stability type solid state laser according to claim 1, it is characterised in that: the temperature sensor
Including temperature sensing unit, it is formed with the armouring screw of the hollow cavity to position the temperature sensing unit, the armour
Dress screw is threadedly coupled with the thermally conductive load seat.
5. a kind of power stability type solid state laser according to claim 4, it is characterised in that: the temperature sensor
For thermal resistance sensor, the thermal resistance sensor is connected to microprocessor after signal amplifier and A/D module, and described is micro-
The output of processor is connected to the Bipolar current driver through D/A module and given value of current isolated amplifier.
6. a kind of power stability type solid state laser according to claim 5, it is characterised in that: the microprocessor,
Current transformer, A/D module, D/A module and given value of current isolated amplifier are integrated on same circuit board.
7. a kind of power stability type solid state laser according to claim 1, it is characterised in that: the temperature sensor
It is multiple uniformly distributed or be distributed in by predetermined rule multiple around optical crystal.
8. a kind of power stability type solid state laser according to claim 1, it is characterised in that: the microprocessor is
Single-chip microcontroller.
9. a kind of power stability type solid state laser according to claim 8, it is characterised in that: further include and the list
The human-computer interaction screen or PC machine of piece machine communication connection.
10. a kind of power stability type solid state laser according to claim 1, it is characterised in that: the semiconductor system
Cold is driven by H bridge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821265007.6U CN208423445U (en) | 2018-08-07 | 2018-08-07 | Power stability type solid state laser |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821265007.6U CN208423445U (en) | 2018-08-07 | 2018-08-07 | Power stability type solid state laser |
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| CN208423445U true CN208423445U (en) | 2019-01-22 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108666856A (en) * | 2018-08-07 | 2018-10-16 | 核工业理化工程研究院 | Power stability type solid state laser and control method |
| CN110755755A (en) * | 2019-11-11 | 2020-02-07 | 哈尔滨工业大学（威海） | Intelligent self-learning laser power control system and photothermal therapy system |
| CN111338403A (en) * | 2020-03-17 | 2020-06-26 | 无锡雷利电子控制技术有限公司 | Control method and control system of PTC heating device |
-
2018
- 2018-08-07 CN CN201821265007.6U patent/CN208423445U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108666856A (en) * | 2018-08-07 | 2018-10-16 | 核工业理化工程研究院 | Power stability type solid state laser and control method |
| CN110755755A (en) * | 2019-11-11 | 2020-02-07 | 哈尔滨工业大学（威海） | Intelligent self-learning laser power control system and photothermal therapy system |
| CN110755755B (en) * | 2019-11-11 | 2021-05-28 | 哈尔滨工业大学（威海） | Intelligent self-learning laser power control system and photothermal therapy system |
| CN111338403A (en) * | 2020-03-17 | 2020-06-26 | 无锡雷利电子控制技术有限公司 | Control method and control system of PTC heating device |
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