CN205581683U - A high accuracy temperature control system for optics microballon chamber - Google Patents
A high accuracy temperature control system for optics microballon chamber Download PDFInfo
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- CN205581683U CN205581683U CN201620363364.0U CN201620363364U CN205581683U CN 205581683 U CN205581683 U CN 205581683U CN 201620363364 U CN201620363364 U CN 201620363364U CN 205581683 U CN205581683 U CN 205581683U
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Abstract
The utility model discloses a high accuracy temperature control system for optics microballon chamber, including AT89C52 singlechip, AD converting circuit, anti -aliasing filter circuit, for appearance amplifier circuit, constant current source, PT1000 temperature sensor, refrigerate and generate heat piece, drive circuit, display module, keyboard module and power module. Temperature high precision measurement adopts little current drive four -wire platinum resistance pt1000's temperature measurement scheme, reduces noise, interference suppression, reduction system error, the measurement accuracy and the stability of improvement system through the anti interference filtration technique. Is thermostatic control produced based on fuzzy by the singlechip intelligence PID compound control algorithm is the order -driven circuit as a result, control refrigeration or the internal temperature of heating plate regulation and control optics microballon chamber mechanical capsulation. The utility model provides a high accuracy temperature control system has characteristics such as high accuracy, good reliability, stability and practicality, can effectively simplify the preparation and the service routine in optics microballon chamber.
Description
Technical field
This utility model relates to field of intelligent control, a kind of high-precision temperature control system for Optical Microsphere Cavities.
Background technology
Thermal coefficient of expansion and the thermo-optic effect of Optical Microsphere cavity material are sensitive to ambient temperature, and ambient temperature change or laser energy absorption all can cause material generation thermal expansion；The thermal expansion of material and thermo-optic effect cause the change of resonant cavity size and refractive index respectively, ultimately cause resonant frequency change；At present, in order to reduce the ambient temperature impact on Optical Microsphere Cavities performance, encapsulate Microsphere Cavities mainly by ultraviolet glue, change the thickness of ultraviolet glue thus reach the ratio changing light in ultraviolet glue, regulate temperature coefficient；This method calculates loaded down with trivial details, relatively costly, selects device complicated, and needs accurately to control ultraviolet glue cladding characteristic.
Optical Microsphere Cavities is temperature sensitive, if temperature in Optical Microsphere Cavities device can accurately be controlled, equally suppresses the temperature effects of Optical Microsphere Cavities；The most this kind of device encapsulates Microsphere Cavities without using ultraviolet glue, can simplify Optical Microsphere Cavities preparation procedure to a certain extent, but need high-precision temperature control system.High-precision temperature control system requires have high-precision measurement and thermostatic control.In superhigh precision is measured, mostly use standard platinum resistance temperature sensor.Its certainty of measurement is up to 0.001 DEG C, and year, drift rate was also less than 0.001 DEG C；In platinum resistor temperature measuring, it is desirable in high precision, little constant-current source support influenced by ambient temperature.The constant-current source of high stable becomes the key of high-acruracy survey, when constant-current source is excessive, can cause the device heatings such as resistance, be produced from heat effect, cause error；But when electric current is too small, signal to noise ratio is difficult to ensure that again；Thermostatic control is commonly used controllable silicon and is realized heater and the manipulation of refrigerator, and this needs intelligentized monitoring temperature algorithm to realize thermostatic control.
Summary of the invention
The purpose of this utility model is to solve the problems of the prior art, it is provided that for the temperature control system of a kind of high accuracy, high reliability, stability and the practicality of Optical Microsphere Cavities.
The high-precision temperature control system that this utility model provides includes: AT89C52 single-chip microcomputer, A/D change-over circuit, Anti-aliasing Filter Circuits, instrument amplifying circuit, constant-current source, PT1000 temperature sensor, refrigeration and fever tablet, drive circuit, display module, Keysheet module and power module.
Described single-chip microcomputer uses AT89C52 single-chip microcomputer, is whole temperature control system control core, and including high-resolution hydrocode, temperature shows and thermostatic control.
Described A/D change-over circuit is the core devices of data acquisition unit, use the integrated chip AD7714 with 8 interior depositors, by to the programming of depositor in sheet, channel selecting, gain selection, frequency filtering selection, change-over period selection, the automatically function such as calibration and AD conversion can be realized.
Described Anti-aliasing Filter Circuits, this circuit includes low-pass filter circuit and sampling hold circuit；Low-pass filter circuit includes resistance R and electric capacity C；Electric capacity in low-pass filter circuit is in parallel with electric capacity in sampling hold circuit.
Described instrument amplifying circuit is mainly made up of three operational amplifiers and 7 resistance, and voltage gain is by resistance adjustment.
Described constant-current source is made up of 5V reference voltage source, impedance transformer A1, voltage amplifier A2 with A3, current amplifier Q1, Q2, Q3, accurate sampling resistor Rx and feedback signal voltage follower A4；Can provide 0.5mA steady current, range of error is less than 0.04%.
Described PT1000 is platinum resistance temperature sensor, is positioned over the temperature of Optical Microsphere Cavities attached near real time measurement Microsphere Cavities.
Described refrigeration and heating plate, cooling piece uses mechanical vibration semiconductor chilling plate, and heating plate is metal ceramic heating sheet.
Described drive circuit uses BTS7960 chip composition half-bridge drive circuit, can be successively to driving refrigeration and heating plate to change Optical Microsphere Cavities ambient temperature.
Described display module includes that ST7920 Chinese Graphic Liquid Crystal Module drives controller and LCD display, under ST7920 controller drives and coordinates, can realize 256 × 32 Dot-Matric LCD Display.
Described Keysheet module includes ZLG7290 keyboard scan chip and 8 × 8 keyboards, is mainly used in the setting of Optical Microsphere Cavities ambient temperature temperature.
Described power module, including the series type direct current regulation source being made up of three terminal integrated voltage stabilizer, rectification and filter circuit.
The beneficial effects of the utility model are, it is provided that a kind of high-precision temperature control system for Microsphere Cavities can suppress the interference that ambient temperature irregularly changes generation, it is ensured that stablizing of Microsphere Cavities performance；Simplify temperature-controlled process, reduce experimental cost.The constant-current source of system design can provide the 0.5mA electric current of high stable to ensure the accurate real time temperature measurement of temperature sensor PT100 0.Instrument amplifying circuit, Anti-aliasing Filter Circuits and high-precision a/d converter combination can reduce the external interference impact on the system of measurement.Thermostatic control uses mechanical vibration semiconductor chilling plate, metal ceramic heating sheet as temperature control element, can reduce temperature and control error, eliminates vibration interference；Arrange in pairs or groups simultaneously, based on Fuzzy-intelligent PID complex control algorithm, the temperature control housing of Microsphere Cavities is carried out high-accuracy and constant temperature control.
Accompanying drawing explanation
Fig. 1 show in this utility model the high-precision temperature control system block diagram for Optical Microsphere Cavities.
Fig. 2 show A/D change-over circuit in this utility model and is connected circuit diagram with single-chip microcomputer.
Fig. 3 show Anti-aliasing Filter Circuits figure in this utility model.
Fig. 4 show this utility model China National Instruments Import & Export Corporation amplification circuit diagram.
Fig. 5 show constant-current source circuit figure in this utility model.
Fig. 6 show Fuzzy-intelligent PID complex control algorithm schematic diagram in this utility model.
Fig. 7 show thermostatic control program flow diagram in this utility model.
Detailed description of the invention
This utility model specific embodiment is described in detail below in conjunction with concrete accompanying drawing.It should be noted that, what the combination of technical characteristic described in following embodiment or technical characteristic was not construed as isolating, they can be mutually combined thus be reached superior technique effect.
As shown in Figure 1, the high-precision temperature control system for Optical Microsphere Cavities that this utility model provides, including: single-chip microcomputer 1, A/D change-over circuit 2, Anti-aliasing Filter Circuits 3, instrument amplifying circuit 4, constant-current source 5, PT1000 temperature sensor 6, refrigeration and fever tablet 7, drive circuit 8, display module 9, Keysheet module 10 and power module 11.
Single-chip microcomputer 1 uses AT89C52 chip as the control core of system, and responsible high-precision temperature survey, temperature set, temperature shows and thermostatic control.
A/D change-over circuit 2 uses 24 high-resolution integrated chip AD7714, is the core devices of data acquisition unit, determines the certainty of measurement of system, is connected circuit diagram with single-chip computer AT89C52 as shown in Figure 2.
Anti-aliasing Filter Circuits 3, circuit design is as it is shown on figure 3, can collect some aliasing signals in being mainly used in decay and filtering the data acquisition of temp measuring system；By resistance R17With electric capacity C5The RC low-pass filter circuit of composition, filters the interference signal more than low-pass filter circuit cut-off frequency 1/2 π RC in high-frequency signal；C6It is connected with high-precision A/D change-over circuit, it is possible to reduce aperture error and give full play to the performance of A/D converter, filter high-frequency harmonic simultaneously.
Instrument amplifying circuit 4, design circuit as shown in Figure 4, is mainly used in small-signal is carried out high Precision Processing.
Constant-current source 5, design circuit is as it is shown in figure 5, work as load resistanceR x When becoming big, moment pressure drop on itV x Increase therewith, then the pressure reduction between in-phase input end and the inverting input of operational amplifier A 3 reduces, output voltage V2 is less than reference voltage, now the inverting input of operational amplifier A 2 produces small negative voltage, pressure reduction between its in-phase input end and inverting input is carried out linear amplification by A2, the positive voltage of output makes the emitter voltage of audion Q3 increase, thus maintains the pressure drop on accurate sampling resistor to keep constant；Work as load resistanceR x During reduction, work process is similar to the above.
PT1000 temperature sensor 6, is mainly used in high-resolution hydrocode, and for eliminating the impact that certainty of measurement is caused by platinum resistance lead resistance, PT1000 uses four-wire system connection.
Refrigeration and fever tablet 7, for heating the ambient temperature of Optical Microsphere Cavities or freeze.
Drive circuit 8, uses BTS7960 chip composition half-bridge drive circuit, can be driven refrigeration and fever tablet successively.
Display module 9, shows for temperature and command status shows.
Keysheet module 10, is mainly used in temperature and presets and instruction input.
Power module 11, provides power supply for system.
Embodiment:
The embodiment of the present application provides a kind of high-precision temperature control system for Optical Microsphere Cavities, including high-acruracy survey and the thermostatic control of Optical Microsphere Cavities mechanical encapsulation body temperature.
System is run and is first passed through input through keyboard target temperature expected value and bound, simultaneously start-up temperature sensor PT1000, and monitoring Optical Microsphere Cavities mechanical encapsulation body temperature, produces corresponding voltage signal in real time；This signal is introduced into instrument amplifying circuit, removes common mode disturbances and also suitably amplifies, then is decayed by aliasing signal by Anti-aliasing Filter Circuits and filter；Then high-precision A/D change-over circuit is inputted；Digital signal after A/D conversion enters Single Chip Microcomputer (SCM) system and carries out digital filtering, and single-chip microcomputer carries out Digital Signal Processing and obtains true temperature, and compares with preset value；If actual temperature is less than target temperature, single-chip microcomputer sends the work of order-driven heating plate and elevates the temperature, otherwise, drive refrigeration circuit work, make temperature reduce；Temperature is shown by last display module 3.
Temperature-controlled process uses Fuzzy-intelligent PID complex control algorithm, and algorithm is based on Fuzzy fuzzy control theory and Intelligent PID Control strategy, finds out control parameterK p (ratio controlling elements),K i (the integration control factor),K D (derivative control factors) and input quantitye(deviation between target temperature and observed temperature),e c Relation between (rate of change of e deviation), it is achieved three real-time corrections controlling parameter.First being provided basic PID parameter by the Fuzzy fuzzy controller of input quantity, carry out state analysis according to basic parameter, differential control item and current state, binding analysis result carries out intelligence correction to PID parameter；Its schematic diagram is as shown in Figure 6.
Control program flow diagram as shown in Figure 7；Initializing and mainly initialize each equipment and variable, system components is ready；By input through keyboard set temperature value and bound temperature (such as: 20 ± 0.010C))；Start-up temperature measuring circuit carries out temperature acquisition；Judge that whether temperature is equal to anticipation temperature；If carrying out temperature equal to anticipation temperature startup display module to show, if being not equal to envision temperature, start Fuzzy-intelligent PID composite algorism controller, output PWM waveform regulation and control rear end performs circuit, carries out temperature adjusting, 10ms is postponed after regulation and control, again carry out temperature acquisition, until temperature is equal to anticipation temperature, and show.
A kind of high-precision temperature control system for Optical Microsphere Cavities that this utility model provides, although the application has been presented for embodiments more of the present utility model, but those skilled in the art is to be understood that, in the case of without departing from this utility model spirit, embodiments herein can be changed.Above-described embodiment is exemplary, should be using embodiments herein as the restriction of this utility model interest field.
Claims (2)
1. the high-precision temperature control system for Optical Microsphere Cavities, including: AT89C52 single-chip microcomputer, A/D change-over circuit, Anti-aliasing Filter Circuits, instrument amplifying circuit, constant-current source, PT1000 temperature sensor, refrigeration and fever tablet, drive circuit, display module, Keysheet module and power module；
Described Anti-aliasing Filter Circuits, this circuit includes low-pass filter circuit and sampling hold circuit；Low-pass filter circuit includes resistance R and electric capacity C；Electric capacity in low-pass filter circuit is in parallel with electric capacity in sampling hold circuit；
Described instrument amplifying circuit is mainly made up of three operational amplifiers and 7 resistance, and voltage gain is by resistance adjustment.
A kind of high-precision temperature control system for Optical Microsphere Cavities the most according to claim 1, it is characterized in that, constant-current source is made up of 5V reference voltage source, impedance transformer A1, voltage amplifier A2 with A3, current amplifier Q1, Q2, Q3, accurate sampling resistor Rx and feedback signal voltage follower A4；Can provide 0.5mA steady current, range of error is less than 0.04%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620363364.0U CN205581683U (en) | 2016-04-27 | 2016-04-27 | A high accuracy temperature control system for optics microballon chamber |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620363364.0U CN205581683U (en) | 2016-04-27 | 2016-04-27 | A high accuracy temperature control system for optics microballon chamber |
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| CN201620363364.0U Expired - Fee Related CN205581683U (en) | 2016-04-27 | 2016-04-27 | A high accuracy temperature control system for optics microballon chamber |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109637313A (en) * | 2018-12-29 | 2019-04-16 | 陕西师范大学 | Transparent solid medium thermo-optic effect demonstrating experiment device |
| CN110187186A (en) * | 2019-06-28 | 2019-08-30 | 广东电网有限责任公司 | A kind of modified segmentation circuit resistance tester |
-
2016
- 2016-04-27 CN CN201620363364.0U patent/CN205581683U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109637313A (en) * | 2018-12-29 | 2019-04-16 | 陕西师范大学 | Transparent solid medium thermo-optic effect demonstrating experiment device |
| CN110187186A (en) * | 2019-06-28 | 2019-08-30 | 广东电网有限责任公司 | A kind of modified segmentation circuit resistance tester |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160914 Termination date: 20170427 |