CN106370395B - Semiconductor laser light source body optimum temperature detection method - Google Patents
Semiconductor laser light source body optimum temperature detection method Download PDFInfo
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- CN106370395B CN106370395B CN201611005349.XA CN201611005349A CN106370395B CN 106370395 B CN106370395 B CN 106370395B CN 201611005349 A CN201611005349 A CN 201611005349A CN 106370395 B CN106370395 B CN 106370395B
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- 238000012545 processing Methods 0.000 claims description 39
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- 239000003381 stabilizer Substances 0.000 description 7
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- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
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- 241001269238 Data Species 0.000 description 1
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- 238000009529 body temperature measurement Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
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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
- G05D23/24—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor
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Abstract
The present invention provides a kind of semiconductor laser light source body optimum temperature detection methods, it is characterised in that the following steps are included: central controller detects the light intensity signal of light source body under different temperatures, obtains the homologous thread of light source temperature and light intensity；Temperature value is that median takes multiple assigned temperatures at the inflection point of light source temperature and the homologous thread of light intensity；Central controller controls light source body sends correction voltage when reaching some assigned temperature, the homologous thread of respective correction voltage and light inspection voltage is corresponding with thus to obtain each assigned temperature；Calculate slope of the light inspection voltage between maximum value and the two o'clock of minimum value in the homologous thread of each correction voltage and light inspection voltage；Choose the control temperature of the corresponding assigned temperature of greatest gradient light source body the most.The purpose of the present invention is to the defects of the prior art, provide a kind of semiconductor laser light source body optimum temperature detection method, effectively obtain light source body optimum Working.
Description
Technical field
The invention belongs to semiconductor laser production fields, and in particular to a kind of semiconductor laser light source body optimum temperature
Detection method.
Background technique
Since First semiconductor laser in 1962 is born, by the research of decades, semiconductor laser is ground
Study carefully and achieve significant progress, wavelength is from infrared, feux rouges to blue green light, and coverage area is gradually expanded, and various performance parameters also have
Very big raising.It is compared with other types of laser, semiconductor laser makes simple, cost since wave-length coverage is wide
It is low, be easy to mass production, and have the characteristics that small in size, light-weight, the service life is long, at optical communication, spectrum analysis, optical information
Industries and the technologies such as reason, the basic and applied research aspect such as medical treatment and life science and military affairs have a wide range of applications.
Although there are many advantages for semiconductor laser, in practical applications, they have the shortcomings that obvious again: defeated
Frequency is easy to be influenced by environment temperature and Injection Current out, and usually in 100MHz or so, adjustability also compares output linewidth
Difference.To overcome the above disadvantages, people use the method for extended cavity: being formed using the rear end face of diffraction grating and laser diode
One extended cavity, constitutes the laser of Littrow structure.1 grade of light that diffraction grating generates feeds back to laser diode realization
Light feedback.Since the line width and chamber length of output laser are inversely proportional, thus laser can be narrowed significantly using extended cavity and light feedback
Line width, usually can be to 5MHz or less.And the angle of diffraction grating and incident light directly determines the output frequency of laser
Value, therefore diffraction grating plays the role of modeling again.Angle by adjusting diffraction grating may be implemented laser and not jump
A wide range of (can usually reach GHz) of mould situation lower frequency is scanned, if the angle one of Injection Current cooperation grating changes, no
The adjustable extent of mode hopping can increase to 5GHz or so.However, the variation of the output frequency with laser, the outbound course of laser
Also it can change.Therefore, in many applications, especially having this in fiber coupling and the longer situation of optical path is one
Larger problem.In order to overcome the problems, such as that optical path changes, people use two kinds of solutions: first is that having invented Littman knot
The semiconductor laser of structure.In Littman structure, 1 grade of light of optical grating diffraction is reflected on a face total reflective mirror, from total reflective mirror
0 grade light output as laser of the reflected light after grating again diffraction.Since the adjusting of laser frequency is to pass through
The angle for changing reflecting mirror is realized without changing the angle of grating, therefore outbound course is constant when laser frequency adjusting；Second is that
In Littrow structure, a beam splitting chip is added between laser diode and grating, the light reflected from beam splitting chip is as laser
Output light, since the angle of beam splitting chip does not change, the direction of laser output does not change.In both the above method, all it is
To lose laser output power as cost.Such as in Littman structure, usual delivery efficiency only has the one of Littrow structure
Half, this is being much very unfavorable to the occasion that power requires.Therefore, a kind of more satisfactory scheme is tied in Littrow
On the basis of structure, on laser output light path plus a reflecting mirror, the angle one of reflecting mirror and grating changes, and swashs to realize
The constant purpose of light output direction.Simultaneously as in the design that commercial semiconductor laser uses, laser diode and grating
Installation be separation, since mechanical instability can inevitably cause the output frequency of semiconductor laser unstable
Property.In addition, presently commercially available semiconductor laser is all made of single layer constant temperature system.Due to there was only single layer temperature control, thus be easy by
The influence of variation of ambient temperature, thus also will affect the frequency stability of semiconductor laser output, meanwhile, in general temperature control
Temperature sensing is all made of single thermistor and realizes in circuit, if the resistance breaks down, will be unable to provide actual temperature,
To cause temperature controlled failure.In the prior art, the temperature of light source body is adjusted due to that can not determine optimum temperature, often very
Hardly possible plays the optimum state of light source body.
Summary of the invention
The purpose of the present invention is to the defects of the prior art, provide a kind of semiconductor laser light source body optimum temperature
Detection method effectively obtains light source body optimum Working.
The present invention provides a kind of semiconductor laser light source body optimum temperature detection methods, it is characterised in that including following
Step:
Central controller detects the light intensity signal of light source body under different temperatures, and it is corresponding with light intensity bent to obtain light source temperature
Line；Temperature value is that median takes multiple assigned temperatures at the inflection point of light source temperature and the homologous thread of light intensity；Center control
Device control light source body sends correction voltage to laser module, thus to obtain each specified temperature when reaching some assigned temperature
Degree is corresponding with the homologous thread of respective correction voltage and light inspection voltage；Calculate the corresponding song of each correction voltage and light inspection voltage
Slope of the light inspection voltage between maximum value and the two o'clock of minimum value in line；Choose the corresponding assigned temperature of greatest gradient light the most
The control temperature of source body.
Above-mentioned technical proposal the following steps are included:
The first step, central controller only pass through main control module and export different temperature to light source body, while being examined by light
It surveys module and carries out luminosity sampling, obtain the homologous thread of light source temperature and light intensity；
Second step analyzes the corresponding relationship of light source temperature and light intensity, obtains the inflection point of light source temperature and the Relationship of Light intensity
Data, central processing unit control main control module and stablize the temperature value of output inflection point data in light source temperature；
Third step determines the adjusting range of light source temperature using the temperature value of inflection point data as median, in adjusting range
Multiple assigned temperatures are inside uniformly chosen, central processing unit starting secondary control module control light source temperature reaches assigned temperature；
4th step, when light source temperature reaches some assigned temperature, central processing unit is sent to laser module to be connected
Continue incremental correction voltage signal, is fed back in frequency stabilization module after light detection module obtains corresponding light intensity signal, through frequency stabilization
Resume module feeds back to laser module again, and central processing unit access laser module obtains the light inspection electricity of corresponding reflection light intensity
Signal is pressed, to obtain the homologous thread of correction voltage and light inspection voltage；Each assigned temperature is corresponding with respective correction electricity
The homologous thread of pressure and light inspection voltage；
5th step, seeking light inspection voltage in the homologous thread of each correction voltage and light inspection voltage is maximum value and minimum
Slope between the two o'clock of value；
6th step, more multiple slopes obtain maximum value therein, and choose the corresponding assigned temperature of greatest gradient the most
The control temperature of light source body.
It include the homologous thread glazing inspection of judgement selection correction voltage and light inspection voltage in 5th step of above-mentioned technical proposal
Point of the voltage closest to 0, while the value of the corresponding correction voltage of the point is recorded, this position is set to origin；In correction voltage
The point of identical quantity is respectively taken on origin both sides respectively on the axis of place, is carried out curve fitting to this above-mentioned point data, is obtained corresponding
Slope value.
The dispute voltage output value collected in 5th step of above-mentioned technical proposal, which is communicated through central processing unit with PC, to be deposited
Enter in individual file, and it is handled, obtains light inspection voltage max in correction voltage and light inspection voltage homologous thread
VHAnd minimum value VL, and record this moment and rectify a deviation accordingly voltage HfAnd Lf, i.e. the voltage value of central processing unit D/A output.
Dispute voltage and light the inspection voltage of above-mentioned technical proposal are one-to-one relationship.
The present invention provides a kind of semiconductor laser light source body optimum temperature detection devices, it is characterised in that: it includes
Light source body, the interior illuminator containing in existing laser, is placed in mounting box；
Main control module, the temperature including the power transistor being set to inside mounting box and for detecting light source temperature
Sensor controls power by the output voltage of temperature sensor and the comparison result of main control module inner setting voltage value
The switch state of transistor realizes that the leading temperature control to illuminator acts on；
Secondary control module, the brass pedestal including being set to mounting box bottom are provided with for detecting on brass pedestal
The thermistor of light source temperature sets the comparison result of resistance by thermistor resistance value and control secondary control module,
It controls brass base semiconductor cooling piece energized state and realizes that the auxiliary temperature control to light source body acts on；
Light detection module, the key light for exporting to laser carry out intensity detection, obtain light intensity signal；
Laser module receives the order from central processing unit according to it and controls laser output key light；
Frequency stabilization module feeds back to laser module after receiving the light intensity signal processing from light detection module, realizes to sharp
The frequency stabilization of light device output key light；
Central processing unit sends correction voltage signal to laser module, receives the light intensity signal from light detection module
With the temperature signal from temperature sensor and thermistor, correction voltage signal, light intensity signal and temperature are handled by analysis
Signal determines the control temperature of light source body, and inner setting voltage value and the auxiliary control of main control module are adjusted according to control temperature
The setting resistance of molding block；
The main control module includes temperature sensor, the first voltage-stablizer, first comparator, brilliant with phase follower and power
Body pipe；The input terminal of first voltage-stabiliser tube connects the first power supply, and the output end of the first voltage-stabiliser tube is connected to the anode of first comparator
Input terminal；The voltage value of the output of first voltage-stabiliser tube to first comparator is inner setting voltage value；Temperature sensor detection light
Source temperature and output voltage to first comparator negative input；The output end of first comparator is passed through to be connected with phase follower
To the base stage of power transistor；The collector of power transistor is connected to power supply, the emitter ground connection of power transistor.
Multiple auxiliary transistors are in series between the power transistor and power supply.The power transistor and multiple auxiliary
Transistor is uniformly arranged on the quadrangle in mounting box respectively.
The output end of first voltage-stabiliser tube is grounded through third fixed value resistance and the first adjustable resistance, the first adjustable resistance
Adjustment end is connected to the electrode input end of first comparator.
The secondary control module includes the second voltage-stablizer, instrument amplifier, operational amplifier, the first triode, second
Triode, third transistor, the 4th triode and semiconductor chilling plate；The input terminal of second voltage-stablizer connects second source, the
Digital regulation resistance of first output end of two voltage-stablizers through the first fixed value resistance and for reflecting brass base temperature is grounded；Second
The second output terminal of voltage-stablizer is grounded through the second fixed value resistance and the second adjustable resistance；Second adjustable resistance is setting resistance；Instrument
The in-phase end of table amplifier is connected between the first fixed value resistance and digital regulation resistance；The backward end of instrument amplifier is connected to can
On the connector for adjusting resistance；The collector of second triode connects third power supply, and the emitter of the second triode connects the four or three pole
The collector of pipe, the emitter ground connection of the 4th triode；The base stage of collector the second triode of connection of first triode, first
The collector of the emitter connection third transistor of triode, the emitter of third transistor connect the base stage of the 4th triode,
The base stage of first triode is connected with the base stage of third transistor；The output end of instrument amplifier is connected to through operational amplifier
Between the base stage of one triode and the base stage of third transistor；Semiconductor chilling plate one end is connected to the hair of the second triode
Between emitter-base bandgap grading and the collector of the 4th triode and between the emitter of the first triode and the collector of third transistor；Partly lead
Body cooling piece other end ground connection.
The instrument amplifier realizes the adjustable of amplification factor by third adjustable resistance.
The thermistor includes multiple and is evenly arranged on brass pedestal, and central processing unit, which receives, comes from multiple temperature-sensitives
The resistance value information of resistance is simultaneously compared it, and sends control command to digital regulation resistance, makes the resistance value of digital regulation resistance
For the average value of two thermistor resistance values similar in numerical value.
The present invention provides a kind of semiconductor laser light source body controlling means, it is characterised in that the following steps are included:
The first step, central controller only pass through main control module and export different temperature to light source body, while being examined by light
It surveys module and carries out luminosity sampling, obtain the homologous thread of light source temperature and light intensity；
Second step analyzes the corresponding relationship of light source temperature and light intensity, obtains the inflection point of light source temperature and the Relationship of Light intensity
Data, central processing unit control main control module and stablize the temperature value of output inflection point data in light source temperature；
Third step determines the adjusting range of light source temperature using the temperature value of inflection point data as median, in adjusting range
Multiple assigned temperatures are inside uniformly chosen, central processing unit starting secondary control module control light source temperature reaches assigned temperature；
4th step, when light source temperature reaches some assigned temperature, central processing unit is sent to laser module to be connected
Continue incremental correction voltage signal, is fed back in frequency stabilization module after light detection module obtains corresponding light intensity signal, through frequency stabilization
Resume module feeds back to laser module again, and central processing unit access laser module obtains the light inspection electricity of corresponding reflection light intensity
Signal is pressed, to obtain the homologous thread of correction voltage and light inspection voltage；Each assigned temperature is corresponding with respective correction electricity
The homologous thread of pressure and light inspection voltage；
5th step, seeking light inspection voltage in the homologous thread of each correction voltage and light inspection voltage is maximum value and minimum
Slope between the two o'clock of value；
6th step, more multiple slopes obtain maximum value therein, and choose the corresponding assigned temperature of greatest gradient the most
The control temperature of light source body.
It include the homologous thread glazing inspection of judgement selection correction voltage and light inspection voltage in above-mentioned technical proposal, in the 4th step
Point of the voltage closest to 0, while the value of the corresponding correction voltage of the point is recorded, this position is set to origin；In correction voltage
The point of identical quantity is respectively taken on origin both sides respectively on the axis of place, is carried out curve fitting to this above-mentioned point data, is obtained corresponding
Slope value.
The present invention by inside the mounting box of light source body quadrangle be evenly arranged with transistor, when its conducting when, can release
A large amount of heat passes through the heat, so that it may heat to the light source body of laser.Main control module passes through temperature sensor
Realize the real-time detection to light source temperature.Central processing unit is realized by the adjusting to the first adjustable resistance to the first voltage-stablizer
It exports to the voltage of first comparator and adjusts, that is, adjust the builtin voltage setting value of main control module, meet different use need
It asks.The first comparator of main controller module is according to the comparative structure control of temperature sensor output voltage and inner setting voltage value
Transistor processed is cut-off, and realizes the control to heated condition.It has been evenly arranged thermistor on the brass pedestal of mounting box, it is multiple
The resistance value of thermistor is input to central processing unit, and central processing unit is compared multiple resistance values, then will be similar in numerical value
The average value of two resistance values is defeated by digital regulation resistance, and the measurement to multiple spot on the one hand may be implemented, and improves the efficiency of temperature control；Separately
On the one hand, when one of thermistor break down the case where, any one thermistor damage will not be to digital regulation resistance
Resistance value have an impact.Secondary control module is realized by the comparison of digital regulation resistance resistance value and the second adjustable resistance resistance value to light
Whether source temperature suitably judge, when the temperature of brass bottom plate is below or above set temperature, flows through the electric current meeting of cooling piece
Difference is to realize that the different purposes of heating and refrigeration are finally reached to reduce the temperature difference between brass temperature and set temperature
It is mutually synthermal.The present invention is by analyzing and determining that correction voltage signal, light intensity signal and temperature signal determine the temperature control temperature of light source body
Degree, guarantees that light source body reaches optimum efficiency.
The present invention realizes that variation of the light source body problem on a wide range of controls by main control module；Mould is controlled by auxiliary
Block realizes that light source body problem is specifying small-scale variation to control, and the precision of temperature measurement is effectively ensured.The present invention is by dividing
Analysis judgement correction voltage signal, light intensity signal and temperature signal determine the control temperature of light source body, guarantee that light source body reaches best
Effect.
Detailed description of the invention
Fig. 1 is circuit diagram a of the present invention；
Fig. 2 is circuit diagram b of the present invention；
Fig. 3 is circuit diagram c of the present invention；
Fig. 4 is that the present invention uses schematic diagram a；
Fig. 5 is that the present invention uses schematic diagram b；
Specific embodiment
The following further describes the present invention in detail with reference to the accompanying drawings and specific embodiments, convenient for this hair is well understood
It is bright, but they limiting the invention.
As shown in the figure the present invention provides a kind of semiconductor laser light source body optimum temperature detection device, feature exists
In: it includes
Light source body, the interior illuminator containing in existing laser, is placed in mounting box；
Main control module, the temperature including the power transistor being set to inside mounting box and for detecting light source temperature
Sensor controls power by the output voltage of temperature sensor and the comparison result of main control module inner setting voltage value
The switch state of transistor realizes that the leading temperature control to illuminator acts on；
Secondary control module, the brass pedestal including being set to mounting box bottom are provided with for detecting on brass pedestal
The thermistor of light source temperature sets the comparison result of resistance by thermistor resistance value and control secondary control module,
It controls brass base semiconductor cooling piece energized state and realizes that the auxiliary temperature control to light source body acts on；
Light detection module, the key light for exporting to laser carry out intensity detection, obtain light intensity signal；
Laser module receives the order from central processing unit according to it and controls laser output key light；
Frequency stabilization module feeds back to laser module after receiving the light intensity signal processing from light detection module, realizes to sharp
The frequency stabilization of light device output key light；
Central processing unit sends correction voltage signal to laser module, receives the light intensity signal from light detection module
With the temperature signal from temperature sensor and thermistor, correction voltage signal, light intensity signal and temperature are handled by analysis
Signal determines the control temperature of light source body, and inner setting voltage value and the auxiliary control of main control module are adjusted according to control temperature
The setting resistance of molding block；
The main control module include temperature sensor T1, the first voltage-stablizer U3, first comparator U5, with phase follower U6
With power transistor Q5；The input terminal of first voltage-stabiliser tube U3 connects the first power supply；The output end of the first voltage-stabiliser tube U3 is through
Three fixed value resistance R16 and the first adjustable resistance R17 ground connection, the adjustment end of the first adjustable resistance R17 is connected to first comparator
The electrode input end of U5.The voltage value of the output of first voltage-stabiliser tube U3 to first comparator is inner setting voltage value；Temperature passes
Sensor T1 detects the negative input of light source temperature and output voltage to first comparator U5；The output end of first comparator U5
The base stage of power transistor Q5 is connected to through same phase follower U6；The collector of power transistor is connected to power supply, power crystal
The emitter of pipe is grounded.3 auxiliary transistor Q6-Q8 are in series between the power transistor and power supply.The power crystal
Pipe and multiple auxiliary transistors are uniformly arranged on the quadrangle in mounting box respectively.
In use, firstly, by the temperature of temperature sensor T1 probe source body, the voltage of temperature sensor T1 output and
The reference voltage that first voltage-stablizer U3 is provided is compared by the first amplifier, if the voltage at its 3 end be higher than 2 end voltages, 1
Output is positive voltage；If 3 end voltages are equal to or less than 2 end voltages, the output of 1 end is 0.The voltage of first amplifier, 1 end output
Power transistor Q5 is given by exporting after same phase follower.If the voltage between the base stage and emitter of power transistor Q5 is big
In 1.4V, then power transistor Q5 is connected, and otherwise power transistor Q5 is not turned on.Assist the base voltage difference of Q6, Q7 and Q8
For 22.5V, 15V and 7.5V.If power transistor Q5 is connected, the collector voltage of power transistor Q5 is about 1.4V, due to
The emitter of auxiliary transistor Q8 is connected with the collector of power transistor Q5, therefore the emitter voltage of auxiliary transistor Q8 is
1.4V.Since the voltage between the base stage and emitter of auxiliary transistor Q8 is 6.1V, it is greater than 1.4V, therefore auxiliary transistor Q8
It can be connected.The voltage of collector is 7.5V, the emitter and aid crystal of auxiliary transistor Q7 after auxiliary transistor Q8 conducting
The collector of pipe Q8 is connected, therefore the emitter voltage of auxiliary transistor Q7 is 7.5V.Due to auxiliary transistor Q7 base stage and
Voltage between emitter is 7.5V, is greater than 1.4V, therefore auxiliary transistor Q7 can be connected.Collect after auxiliary transistor Q7 conducting
The voltage of electrode is 15V, and since the emitter of auxiliary transistor Q6 is connected with the collector of auxiliary transistor Q7, auxiliary is brilliant
The emitter voltage of body pipe Q6 is 15V.Since the base stage of auxiliary transistor Q6 and the voltage of emitter are 7.5V, auxiliary is brilliant
Body pipe Q6 can be connected.Auxiliary transistor Q6, auxiliary transistor Q7, auxiliary transistor Q8 and power transistor Q5 position be located at box
Four angles of son.When auxiliary transistor Q6, auxiliary transistor Q7, auxiliary transistor Q8 and power transistor Q5 conducting, can put
A large amount of heat out passes through the heat, so that it may heat to the light source body of laser.
The secondary control module includes the second voltage-stablizer U1, instrument amplifier U2, operational amplifier U4, the first triode
Q1, the second triode Q2, third transistor Q3, the 4th triode Q4 and semiconductor chilling plate R15；The input of second voltage-stablizer U1
End connection second source, the first output end of U1 of the second voltage-stablizer is through the first fixed value resistance R1 and for reflecting brass base temperature
Digital regulation resistance R3 ground connection；The second output terminal of second voltage-stablizer connects through the second fixed value resistance R2 and the second adjustable resistance R4
Ground；Second adjustable resistance R4 is setting resistance；The in-phase end of instrument amplifier U2 is connected to the first fixed value resistance R1 and number electricity
Between the device R3 of position；The backward end of instrument amplifier U2 is connected on the connector of the second adjustable resistance；The current collection of second triode Q2
Pole connects third power supply, and the emitter of the second triode Q2 connects the collector of the 4th triode Q4, the hair of the 4th triode Q4
Emitter grounding；The collector of first triode Q1 connects the base stage of the second triode Q2, the emitter connection of the first triode Q1
The collector of third transistor Q3, the emitter of third transistor Q3 connect the base stage of the 4th triode Q4, the first triode Q1
Base stage connected with the base stage of third transistor Q3；The output end of instrument amplifier is connected to the first triode through operational amplifier
Between the base stage of Q1 and the base stage of third transistor Q3；The one end semiconductor chilling plate R15 is connected to the second triode Q2's
Between emitter and the collector of the 4th triode Q4 and the collector of the emitter of the first triode Q1 and third transistor Q3
Between；Semiconductor chilling plate R15 other end ground connection.The instrument amplifier realizes amplification factor by third adjustable resistance R5
It is adjustable.
The thermistor includes multiple and is evenly arranged on brass pedestal, and central processing unit, which receives, comes from multiple temperature-sensitives
The resistance value information of resistance is simultaneously compared it, and sends control command to digital regulation resistance, makes the resistance value of digital regulation resistance
For the average value of two thermistor resistance values similar in numerical value.In order to eliminate the temperature difference at each position of brass pedestal, in Huang
The different location of copper pedestal disposes the thermistor of 3 same models, and the resistance value of 3 thermistors is input to central processing
Device, central processing unit are compared three resistance values, and the average value of two resistance values similar in numerical value is then defeated by digital electricity
Position device R3.The advantages of this scheme, is: the measurement to multiple spot on the one hand may be implemented, improve the efficiency of temperature control, as long as because
Any one of two resistance taken changes the variation that can all bring average value, to cause the resistance of digital regulation resistance R3
The variation of value.On the other hand, this scheme can also be coped with the case where one of thermistor breaks down, any one temperature-sensitive electricity
Resistance damage will not have an impact the resistance value of digital regulation resistance R3.
In use, the second voltage-stablizer U1 is 10V voltage reference, stable 10V voltage is exported, which passes through bridge circuit
It is input to the in-phase end and reverse side of instrument amplifier U2 later.Wherein reverse side voltage is reference voltage, by the second definite value electricity
The resistance value ratio for hindering R2 and the second adjustable resistance R4 determines.The resistance value that the second adjustable resistance R4 is adjusted by central processing unit, can
To adjust the input voltage of reverse side, thus temperature required for setting.R3 is digital regulation resistance, is carried out using central processing unit
Control.Using the actual temperature of thermistor detection brass pedestal.The voltage of the in-phase end of instrument amplifier U2 depends on first
The ratio between the resistance value of fixed value resistance R1 and digital regulation resistance R3.Due to the equal 100k of the resistance value of two fixed value resistances, instrument is put
The in-phase end and whose voltage height of reverse side of big device U2 will be determined by the size of digital regulation resistance R3 and the second adjustable resistance R4.If
The temperature of brass bottom plate is lower than the temperature set, since the thermistor of temperature detection is negative temperature coefficient, digital regulation resistance
The resistance of R3 is greater than the resistance of the second adjustable resistance R4, so that the in-phase end voltage of instrument amplifier U2 will be greater than reverse side electricity
Pressure, at this moment the 6 ends output of instrument amplifier U2 is positive voltage.The amplification factor of instrument amplifier U2 is by adjusting third adjustable electric
The resistance value for hindering R5 is realized.The voltage of instrument amplifier U2 output is by becoming negative voltage after operational amplifier U3, in this way, third
Triode Q3 and the 4th triode Q4 conducting, electric current flow to third transistor Q3 and the 4th by semiconductor chilling plate R15 by ground
Triode Q4.Due to that will be heated to brass pedestal when semiconductor chilling plate R15 leads to reverse current, can reduce
The temperature difference between brass temperature and set temperature, is finally reached mutually synthermal.If the temperature of brass bottom plate is higher than the temperature of setting,
Voltage less than the second adjustable resistance R4, i.e. the in-phase end voltage of instrument amplifier U2 are less than anti-by the voltage of digital regulation resistance R3
Phase terminal voltage.At this time the 6 ends output of instrument amplifier U2 is negative voltage.The voltage of instrument amplifier U2 output is put by operation
Become positive voltage after big device U3, in this way, the first triode Q1 and the second triode Q2 conducting, electric current by third transistor Q3 and
4th triode Q4 passes through semiconductor chilling plate R15 flow direction ground.To Huang when leading to forward current due to semiconductor chilling plate R15
Copper pedestal freezes, therefore can reduce the temperature difference between brass temperature and set temperature, is finally reached mutually synthermal.
The present invention provides a kind of semiconductor laser light source body controlling means, it is characterised in that the following steps are included:
The first step, central controller only pass through main control module and export different temperature to light source body, while being examined by light
It surveys module and carries out luminosity sampling, and feed back to central processing unit, the homologous thread of light source temperature and light intensity is obtained, such as Fig. 4 institute
Show；Light source body generates heat from cognition in luminescence process but fever time is slow, and main control module can be during the experiment
Light source body is set to keep the state of approximately constant temperature；
Second step analyzes the corresponding relationship of light source temperature and light intensity, obtains the inflection point of light source temperature and the Relationship of Light intensity
Data: 124.5 degrees Celsius；Central processing unit controls main control module and stablizes the temperature value of output inflection point data in light source body temperature
Degree；
Third step determines the adjusting range of light source temperature using the temperature value of inflection point data as median, in adjusting range
Multiple assigned temperatures are inside uniformly chosen, central processing unit starting secondary control module control light source temperature reaches assigned temperature；
The temperature range for selecting quasi- control is 124.0 to 125.0 degrees Celsius, and stepping is 0.01 degree Celsius, that is, takes 100 data points；It is auxiliary
Help control module that can realize the increase and decrease of light source temperature, to meet requirement of experiment；
4th step, when light source temperature reaches some assigned temperature, central processing unit is entangled to laser module transmission
Bias-voltage signal, correction voltage signal is the scanning signal being increased continuously；After light detection module obtains corresponding light intensity signal
It feeds back in frequency stabilization module, feeds back to laser module again through frequency stabilization resume module, central processing unit access laser module obtains
The light for obtaining corresponding reflection light intensity examines voltage signal, to obtain the homologous thread of correction voltage and light inspection voltage；Each refers to
Determine the homologous thread that temperature is corresponding with respective correction voltage and light inspection voltage, obtains 100 groups of figures as shown in Figure 5；
5th step, seeking light inspection voltage in the homologous thread of each correction voltage and light inspection voltage is maximum value and minimum
Slope between the two o'clock of value；Horizontal axis represents correction voltage (reflecting frequency) in Fig. 5, the longitudinal axis represents light inspection voltage and (reflects
Light intensity).Frequency interval between peak-to-peak value is f2-f1.The voltage output value collected, which is communicated through central processing unit with PC, to be deposited
Enter in individual file, and it is handled, obtains the maximum value V of Y axis coordinate in curveHAnd minimum value VL, and record at this time
Carve corresponding X-axis frequency coordinate HfAnd Lf, i.e. the voltage value of central processing unit D/A output.Need to stress is a bit,
During data acquire, it don't fail to guarantee every value for changing an X-axis, while recording this moment corresponding Y-axis voltage value,
They are one-to-one relationships.By above-mentioned scheme, in VL-VHIn range, by the judgment method of software select one most
Close to 0 point, while the value of its X-axis is recorded, this position is set to origin (0,0), put according to this respectively to the left and right side of X-axis
Identical point (such as taking 20 points) is respectively taken, carries out curve fitting to this 41 point datas, obtains corresponding slope value.
6th step, more multiple slopes obtain maximum value therein, and choose the corresponding assigned temperature of greatest gradient the most
The control temperature of light source body.It is 124.0 from temperature range in a maximum corresponding third step is selected in 100 slope values
To 125.0 degrees Celsius some specific temperature value.
The content that this specification is not described in detail belongs to the prior art well known to professional and technical personnel in the field.
Claims (5)
1. a kind of semiconductor laser light source body optimum temperature detection method, it is characterised in that the following steps are included:
Central controller detects the light intensity signal of light source body under different temperatures, obtains the homologous thread of light source temperature and light intensity；
Temperature value is that median takes multiple assigned temperatures at the inflection point of light source temperature and the homologous thread of light intensity；Central controller control
Light source body processed sends correction voltage to laser module, thus to obtain each assigned temperature pair when reaching some assigned temperature
There should be the homologous thread of respective correction voltage and light inspection voltage；In the homologous thread for calculating each correction voltage and light inspection voltage
Light examines slope of the voltage between maximum value and the two o'clock of minimum value；The corresponding assigned temperature of greatest gradient is chosen as light source body
Control temperature.
2. semiconductor laser light source body optimum temperature detection method according to claim 1, it is characterised in that including with
Lower step:
The first step, central controller only pass through main control module and export different temperature to light source body, while passing through light detection mould
Block carries out luminosity sampling, obtains the homologous thread of light source temperature and light intensity；
Second step analyzes the corresponding relationship of light source temperature and light intensity, obtains the inflection point data of light source temperature and the Relationship of Light intensity,
Central processing unit controls main control module and stablizes the temperature value of output inflection point data as light source temperature；
Third step determines the adjusting range of light source temperature using the temperature value of inflection point data as median, in adjusting range
Even to choose multiple assigned temperatures, central processing unit starting secondary control module control light source temperature reaches assigned temperature；
4th step, when light source temperature reaches some assigned temperature, central processing unit is continuously passed to laser module transmission
The correction voltage signal of increasing is fed back in frequency stabilization module after light detection module obtains corresponding light intensity signal, through frequency stabilization module
Processing feeds back to laser module again, and central processing unit access laser module obtains the light inspection voltage letter of corresponding reflection light intensity
Number, to obtain the homologous thread of correction voltage and light inspection voltage；Each assigned temperature be corresponding with respective correction voltage and
The homologous thread of light inspection voltage；
5th step, seeking light inspection voltage in the homologous thread of each correction voltage and light inspection voltage is maximum value and minimum value
Slope between two o'clock；
6th step, more multiple slopes obtain maximum value therein, and choose the corresponding assigned temperature of greatest gradient light source the most
The control temperature of body.
3. semiconductor laser light source body optimum temperature detection method according to claim 2, it is characterised in that the 5th step
In include that the homologous thread glazing of judgement selection correction voltage and light inspection voltage examines point of the voltage closest to 0, while recording should
The value of the corresponding correction voltage of point, is set to origin for this position；Phase is respectively taken on origin both sides respectively on axis where correction voltage
With the point of quantity, carries out curve fitting to this above-mentioned point data, obtain corresponding slope value.
4. semiconductor laser light source body optimum temperature detection method according to claim 2, it is characterised in that the 5th step
In the dispute voltage output value that collects communicated through central processing unit with PC in the individual file of deposit, and at it
Reason obtains light inspection voltage max VH and minimum value VL in correction voltage and light inspection voltage homologous thread, and records this moment phase
Correction the voltage Hf and Lf answered, the i.e. voltage value of central processing unit D/A output.
5. semiconductor laser light source body optimum temperature detection method according to claim 2, it is characterised in that dispute electricity
Pressure and light inspection voltage are one-to-one relationship.
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