CN106200720A - A kind of semiconductor laser digital temperature control system without low-frequency noise - Google Patents
A kind of semiconductor laser digital temperature control system without low-frequency noise Download PDFInfo
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- CN106200720A CN106200720A CN201610845740.4A CN201610845740A CN106200720A CN 106200720 A CN106200720 A CN 106200720A CN 201610845740 A CN201610845740 A CN 201610845740A CN 106200720 A CN106200720 A CN 106200720A
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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
- G05D23/30—Automatic controllers with an auxiliary heating device affecting the sensing element, e.g. for anticipating change of temperature
- G05D23/303—Automatic controllers with an auxiliary heating device affecting the sensing element, e.g. for anticipating change of temperature using a sensing element having a resistance varying with temperature, e.g. thermistor
Abstract
The invention discloses a kind of semiconductor laser digital temperature control system without low-frequency noise, including sinusoidal signal source circuit, thermistor-bridge circuit, differential amplifier circuit, frequency mixer, active low-pass filter circuit, A/D converter, central processing unit, gain switch, also including D/A converter and TEC drive circuit module, central processing unit is connected with serial communication circuit.The present invention uses AC signal as reference source, it is possible to be substantially reduced the interference of direct current signal Middle and low frequency noise, it is possible to more effectively control the temperature of laser instrument, reduces the long term drift of laser temperature；Employing thermistor-bridge circuit inputs, and produces stable reference signal, it is possible to more efficiently acquisition error signal；By the central processing unit control to gain switch, it is achieved that the gain coefficient of error signal accurately automatically controls, thus realizing while temperature accurately controls, be effectively protected difference amplifier, extend its service life.
Description
Technical field
The present invention relates to technical field of temperature control, be specifically related to a kind of semiconductor laser numeral temperature without low-frequency noise
Ore-controlling Role.
Background technology
Semiconductor laser is as a kind of novel LASER Light Source, because its volume is little, lightweight, the high and low power of efficiency drives
The advantage such as dynamic, and it is applied to every field.In quantum information field, the quantum for ion trap systems operates, and needs to use narrow
Ion is cooled down by live width, the laser instrument of frequency stable, but semiconductor laser temperature influence is relatively big, shows output
Wavelength, threshold current, output, service life etc., the temperature controlled improvement of further noise spectra of semiconductor lasers seems outstanding
For important.
Semiconductor laser is typically by structures such as laser diode, photodiode, critesistor, thermoelectric refrigerators (TEC)
Become.Critesistor is usually the resistance of a kind of negative temperature coefficient, is the temperature detection device of temperature control system, and passes through external circuit
Monitor the die temperature of laser diode in real time.TEC is a kind of semiconductor device that same can carry out and freeze and heat, according to pal
Patch effect, when providing driving electric current to TEC, TEC one side heating, another side freezes simultaneously, and when driving electric current reverse, cold
Hot side exchanges.Heating or the refrigerating capacity of TEC are closely related with driving electric current, size of current can be driven to make TEC by changing
Temperature constant.
Summary of the invention
It is an object of the invention to avoid weak point of the prior art and semiconductor laser digital temperature control system is provided
System, it is possible to more stable control temperature, reduces the drift of semiconductor laser output frequency and effectively controls threshold current, carrying
In high service life, operate, for trapped ion and quantum, the experimental situation providing more stable.
The object of the invention is realized by following technical proposals:
A kind of semiconductor laser digital temperature control system without low-frequency noise, including sinusoidal signal source circuit, is used for producing
Sinusoidal ac signal is input to thermistor-bridge circuit and frequency mixer as initial signal,
Also include:
Thermistor-bridge circuit, is used for measuring TEC temperature information and being converted to differential signal being input to differential amplifier circuit；
Differential amplifier circuit, is amplified obtaining error to differential signal for the gain coefficient selected according to gain switch
Signal, and error signal is dealt into frequency mixer；
Frequency mixer, to mixed frequency signal and mixed frequency signal is defeated for carry out being mixed by error signal and initial signal
Go out to active low-pass filter circuit；
Active low-pass filter circuit, exports filtering signal to A/D converter after being filtered mixed frequency signal；
A/D converter, is input to central processing unit for filtering signal is converted into digital signal；
Central processing unit, for according to digital signal obtain differential reference signal value, by differential reference signal value and each
Gain coefficient is multiplied and obtains each error reference signal, finds out the error ginseng of the maximum output voltage less than or equal to difference amplifier
Examining signal alternately error reference signal, the gain coefficient that maximum alternative error reference signal is corresponding is preferred gain system
Number, is converted to gain factor signal by preferred gain coefficient and is sent to gain switch；
Gain switch, for selecting the gain coefficient of difference amplifier according to gain factor signal.
A kind of semiconductor laser digital temperature control system without low-frequency noise, also includes D/A converter and TEC drive circuit
Module,
Described central processing unit obtains temperature after being additionally operable to the digital signal that A/D converter exports is carried out PID arithmetic
Control signal also exports D/A converter,
D/A converter, controls analog signal output to TEC drive circuit mould for temperature control signals is converted to temperature
Block；
TEC drive circuit module, is controlled TEC temperature for controlling analogue signal according to temperature；
Central processing unit as above is connected with serial communication circuit.
The present invention has the advantage that relative to prior art
(1) use AC signal as reference source, it is possible to be substantially reduced the interference of direct current signal Middle and low frequency noise, it is possible to more
For efficiently controlling the temperature of laser instrument, reduce the long term drift of laser temperature.
(2) use thermistor-bridge circuit input, produce stable reference signal, it is possible to more efficiently acquisition error is believed
Number.
(3) by the central processing unit control to gain switch, it is achieved that the gain coefficient of error signal is controlled the most automatically
System, thus realizing while temperature accurately controls, it is effectively protected difference amplifier, extends its service life.
(4) temperature control circuit uses separate type wire to be connected with laser instrument, detachably, uses convenient, and can be applicable to
The semiconductor laser of different frequency.
Accompanying drawing explanation
Fig. 1 is present configuration block diagram；
Fig. 2 is the embodiment circuit theory diagrams of frequency mixer and active low-pass filter circuit；
Fig. 3 is the implementing circuit schematic diagram of gain switch and difference amplifier；
Fig. 4 is the implementing circuit schematic diagram of TEC drive circuit module.
Detailed description of the invention
Further illustrate technical scheme below in conjunction with the accompanying drawings and by detailed description of the invention, but in accompanying drawing
Embodiment does not constitute any limitation of the invention.
As it is shown in figure 1, a kind of semiconductor laser digital temperature control system without low-frequency noise, including sinusoidal signal source circuit
(can be selected for XR2206 chip, 10KHz), thermistor-bridge circuit, difference amplifier (can be selected for AD620), frequency mixer (can be selected for
AD633), active low-pass filter circuit, A/D change-over circuit (can be selected for AD7712), D/A change-over circuit (can be selected for AD5722),
Central processing unit (can be selected for AT89S52TQFP), gain switch (can be selected for ADG1611), TEC drive circuit module and serial ports are logical
Letter circuit.
Wherein, sinusoidal signal source circuit generation sinusoidal ac signal is as initial signal, and initial signal is through a temperature-sensitive
Bridge circuit, thermistor-bridge circuit include a critesistor being placed within laser instrument, the fixed resistance of three 10K Ω and
The variable resistance of one maximum value 10K Ω, initial signal exports differential signal to differential amplification after thermistor-bridge circuit
Device.
Difference amplifier is amplified rear output error signal to frequency mixer, error signal and sinusoidal signal to differential signal
The initial signal that source circuit produces all accesses frequency mixer to carry out being mixed and export mixed frequency signal to active low-pass filter circuit, mixing
Signal can be considered error signal and the product of initial signal, and mixed frequency signal can be expressed as
Wherein f1 is initial signal amplitude, and f2 is error signal amplitude, and ω is the frequency of initial signal, and k is gain coefficient.
Mixed frequency signal enters in active low-pass filter circuit and is filtered exporting filtering signal to A/D converter, active low
Bandpass filter circuit such as Fig. 2, active low-pass filter circuit includes second-order filter circuit, and two ends are connected to second-order filter
Input and the negative-feedback circuit of outfan, second-order filter circuit is second-order active power filter circuit, and negative-feedback circuit is by one
The reverse amplification circuit that OP07 chip is constituted, it is possible to realize more stable filter effect.The filtering of output after device after filtering
Signal can be expressed as:
Filtering signal is converted to digital signal through A/D converter and is input in central processing unit.Central processing unit according to
Digital signal selects gain factor signal, and gain factor signal is exported gain switch, and gain switch is according to gain factor
Signal controls the size of the gain resistor being connected with difference amplifier, and then is controlled the gain coefficient of difference amplifier.
Wherein, gain switch includes several on and off switch and a control end, and the gain control end of difference amplifier is also
Be associated with the gain control unit consistent with on and off switch number, each gain control unit include series connection an on and off switch and
One gain resistor, by the control of gain switch terminate into gain factor signal control the break-make of each on and off switch, enter
And the size of the equivalent resistance that the gain control end controlling difference amplifier accesses, and then control the gain system of difference amplifier
Number.As it is shown on figure 3, as a kind of concrete circuit embodiments, gain switch controls the 1 of difference amplifier respectively, 10,100,
1000 4 kinds of different gain coefficients, need to ensure, error signal is less than or equal to the maximum output voltage of difference amplifier.
First the gain coefficient arranging difference amplifier is 1, is not amplified error signal processing, it is ensured that output signal is undistorted.
The value of the digital signal collected by A/D converter divided byCalculate differential reference signal value f2', then difference is joined
Examine signal value f2' being multiplied with each gain coefficient obtains each error reference signal, find out less than or equal to difference amplifier
The error reference signal alternately error reference signal of big output voltage, the gain that maximum alternative error reference signal is corresponding
Coefficient is preferred gain coefficient, and the gain coefficient that central processing unit controls difference amplifier by gain switch is preferred gain
Coefficient.
Can be with laser instrument corresponding to the change of observational error signal and digital signal by connecting the serial port circuit of computer
The fluctuation of relative temperature.When the fluctuation of laser instrument relative temperature corresponding to digital signal is basically unchanged, this explanation laser instrument
Temperature has stabilized, it is possible to meet the requirement of experiment.
On the one hand digital signal is stored by central processing unit, on the other hand, utilizes the pid algorithm number to input
Word signal carries out processing output temperature digital modulation signals to be changed temperature digital modulated signal to D/A converter, D/A sensor
Export TEC drive circuit module for temperature simulation modulated signal, and then TEC is controlled.Pid parameter can be by testing
Update and obtain, set different preliminary election pid parameters, by observing laser instrument corresponding to different preliminary election pid parameters
Temperature stabilization times and overshoot, select temperature stabilization times the shortest, and the minimum preliminary election pid parameter of overshoot determines one
Good pid parameter, in order to make pid algorithm effect reach optimal, is respectively provided with the most here under different gain coefficients
Good pid parameter.Signal after process is converted to analogue signal by D/A converter AD5722 chip, as TEC drive circuit mould
The control signal of block.
TEC drive circuit such as Fig. 4, signal inputs from voltage follower, inputs to instead after a variable resistance dividing potential drop
Phase amplifier, and add a filtering negative feedback, it is achieved more stable filter and amplification, from the 6 foot outputs of OP07, it is input to
In the class B power amplifying circuit being made up of two power amplifiers, by power amplifier, the electric current through TEC is controlled
System, and then control the temperature of laser instrument.Voltage signal therein is after dividing potential drop, and 2 feet being again inputted into OP07 are born
Feedback regulation.
Preferably, critesistor is placed on the inside of laser instrument copper coin, and near the position of laser head, TEC is used for controlling to swash
The temperature of light device copper coin, it is ensured that critesistor is basically identical with the temperature of TEC.
It is last it should be noted that, the present invention is only protected by above example in order to technical scheme to be described
The restriction of scope, although being explained in detail the present invention with reference to preferred embodiment, those of ordinary skill in the art should manage
Solve, technical scheme can be modified or equivalent, without deviating from technical solution of the present invention essence and
Scope.
Claims (3)
1. without a semiconductor laser digital temperature control system for low-frequency noise, including sinusoidal signal source circuit, for just producing
String AC signal is input to thermistor-bridge circuit and frequency mixer as initial signal, it is characterised in that also include:
Thermistor-bridge circuit, is used for measuring TEC temperature information and being converted to differential signal being input to differential amplifier circuit；
Differential amplifier circuit, is amplified obtaining error letter to differential signal for the gain coefficient selected according to gain switch
Number, and error signal is dealt into frequency mixer；
Frequency mixer, for carry out being mixed by error signal and initial signal to mixed frequency signal, and mixed frequency signal is exported
Active low-pass filter circuit；
Active low-pass filter circuit, exports filtering signal to A/D converter after being filtered mixed frequency signal；
A/D converter, is input to central processing unit for filtering signal is converted into digital signal；
Central processing unit, for obtaining differential reference signal value according to digital signal, by differential reference signal value and each gain
Multiplication obtains each error reference signal, finds out the error of the maximum output voltage less than or equal to difference amplifier with reference to letter
Number alternately error reference signal, the gain coefficient that maximum alternative error reference signal is corresponding is preferred gain coefficient,
Preferred gain coefficient is converted to gain factor signal and is sent to gain switch；
Gain switch, for selecting the gain coefficient of difference amplifier according to gain factor signal.
A kind of semiconductor laser digital temperature control system without low-frequency noise the most according to claim 1, it is characterised in that
Also include D/A converter and TEC drive circuit module,
Described central processing unit obtains temperature control after being additionally operable to the digital signal that A/D converter exports is carried out PID arithmetic
Signal also exports D/A converter,
D/A converter, controls analog signal output to TEC drive circuit module for temperature control signals is converted to temperature；
TEC drive circuit module, is controlled TEC temperature for controlling analogue signal according to temperature.
A kind of semiconductor laser digital temperature control system without low-frequency noise the most according to claim 2, it is characterised in that
Described central processing unit is connected with serial communication circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610845740.4A CN106200720B (en) | 2016-09-23 | 2016-09-23 | A kind of semiconductor laser digital temperature control system of no low-frequency noise |
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| CN201610845740.4A CN106200720B (en) | 2016-09-23 | 2016-09-23 | A kind of semiconductor laser digital temperature control system of no low-frequency noise |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110426960A (en) * | 2019-08-29 | 2019-11-08 | 苏州邈航科技有限公司 | Laser Control System and its Design of Internal Model Controller method with interference observer |
| CN110502047A (en) * | 2019-08-29 | 2019-11-26 | 苏州邈航科技有限公司 | Laser Control System and its temperature demodulation method based on AC temperature-control |
| CN114544049A (en) * | 2022-01-05 | 2022-05-27 | 新余学院 | Pressure detection device of flexible electronic skin sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110426960A (en) * | 2019-08-29 | 2019-11-08 | 苏州邈航科技有限公司 | Laser Control System and its Design of Internal Model Controller method with interference observer |
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| CN114544049A (en) * | 2022-01-05 | 2022-05-27 | 新余学院 | Pressure detection device of flexible electronic skin sensor |
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| CN106200720B (en) | 2017-11-24 |
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