CN105784126A - Infrared detector assembly multi-channel temperature monitoring system based on diode temperature measurement - Google Patents
Infrared detector assembly multi-channel temperature monitoring system based on diode temperature measurement Download PDFInfo
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- CN105784126A CN105784126A CN201610236192.5A CN201610236192A CN105784126A CN 105784126 A CN105784126 A CN 105784126A CN 201610236192 A CN201610236192 A CN 201610236192A CN 105784126 A CN105784126 A CN 105784126A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 20
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- 230000001105 regulatory effect Effects 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 239000004973 liquid crystal related substance Substances 0.000 claims description 7
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
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- 229910052710 silicon Inorganic materials 0.000 description 2
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/10—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors
- G01J5/20—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors using resistors, thermistors or semiconductors sensitive to radiation, e.g. photoconductive devices
- G01J5/22—Electrical features thereof
Abstract
The invention discloses an infrared detector assembly multi-channel temperature monitoring system based on diode temperature measurement. The infrared detector assembly multi-channel temperature monitoring system comprises a main control module, a power supply voltage-stabilizing conditioning module, a temperature acquisition module, a signal conditioning module, a display module, a data playback and time calibration key module and a USB to serial port module. Through special design treatment, the infrared detector assembly multi-channel temperature monitoring system achieves continuously adjustable bias current of a temperature measuring diode, multi-channel temperature long-time real-time monitoring, real-time display, automatic recording and storage as well as intelligent alarm. The infrared detector assembly multi-channel temperature monitoring system has the advantages of simple operation, low cost, high portability and high measuring precision, and is also suitable for other temperature monitoring occasions adopting diode temperature measurement.
Description
Technical field
The present invention relates to infrared detector module application technology, refer specifically to a kind of infrared detector module multi way temperature based on diode thermometric and monitor system, it is applicable to the application of refrigeration type infrared detector assembly, present disclosure applies equally to other temperature monitoring occasion adopting diode thermometric.
Background technology
Infrared detector module has a wide range of applications at space flight and aviation infrared regime.Along with wavelength is to the raising of long wave extension and detectivity, Infrared Detectors could must work under profound hypothermia.When detector is operated in low temperature environment, many employing vacuum insulation isolation between itself and external equipment.Electronic communication detector and external equipment is realized through vacuum interlayer by Electricity Federation wire.In order to reduce the heat power consumption of infrared detector module, these detectors outreach the wire of electronic communication and are generally adopted the material that thermal resistance is relatively larger, so cause that detector outreaches the conductor resistance of electronic communication also bigger than normal accordingly, in order to improve temperature measurement accuracy, general adopt diodes as temperature element more.
In infrared detector module is applied, it is necessary to detector operating temperature is detected.Sometimes for multiple thermometric diodes of multiple infrared detector modules or an infrared detector module being carried out for a long time monitoring in real time.Traditional method is to adopt constant-current source to provide a specific bias current to thermometric diode, then gathers the voltage at diode two ends, according to known temperature and voltage curve, knows temperature by the mode tabled look-up.This is obviously not suitable for the monitoring of long-time multi way temperature real time record.It addition, the bias current of thermometric diode is many at 25 μ A-1mA in refrigeration type infrared detector assembly.According to the constant-current source that different types of diode arrangement is different, in order to adapt to the long-time real time temperature monitoring record of all types of infrared detector modules, a kind of new method need be explored to solve this problem.
Summary of the invention
It is an object of the invention to provide a kind of infrared detector module multi way temperature based on diode thermometric and monitor system, implement function such as: 1) continuously adjustabe to thermometric diode bias current 25 μ A-1mA；2) multiple point for measuring temperature temperature real-time monitoring record for a long time；3) according to the corresponding relation of diode-built-in temperature and voltage at the real-time displays temperature of system display interface；4) system has storage function；5) data exchange is carried out by USB interface and outer attached device；6) based on succinctly portable and reduce interference to temperature measurement accuracy, adopt battery to power and USB powers dual power supply.
The present invention is that a kind of infrared detector module multi way temperature based on diode thermometric monitors system, including following module: main control module, power supply voltage stabilizing conditioning module, temperature collect module, Signal-regulated kinase, display module, data readback and time calibration key-press module and USB turn serial port module.
Main control module adopts the STMicw Electronics STM32 series based on the microcontroller that Cortex-M3 is core, and this series has abundant memorizer and various Peripheral Interface resource, it is possible to the well requirement of satisfied temperature monitoring system.
What power supply voltage stabilizing conditioning module adopted is dual power supply pattern, and namely external power supply pattern and battery powered mode switch over according to actual working condition.Need to obtain burning voltage for improving certainty of measurement, adopt voltage stabilizing chip to carry out voltage stabilizing output.Stable system working output voltage is obtained with voltage stabilizing chip again after cell voltage is adopted boost chip boosting.
Temperature collect module is diode temperature sensor measuring circuit, and the diode of sensitivity to(for) temperature in infrared detector module is significantly high, keeps good linear relationship in very big temperature range.Usually forward bias, imposes constant current, and when the temperature is changed, its forward junction voltage V changes therewith, and V and temperature T meets specific function relational expression.
The data come by sensor acquisition in Signal-regulated kinase are generally small-signal, are less able to directly meet the needs of AD conversion input voltage.The meeting that the input range of AD is insufficient makes certainty of measurement substantially reduce.Use amplifier chip that small-signal is implemented enlarging function that amplitude conversion moves with level with meet AD input voltage demand.
Display module is liquid crystal display, and what the present invention selected is a kind of graphic dot matrix liquid crystal display.It is mainly made up of the full lattice lcd display of line driver/row driver and 128 × 64.The display of figure and Chinese character can be completed, constitute good man-machine interaction graphical interfaces.
Data readback and time calibration key-press module be that button is circulated scanning, when find have button to press time, then enter corresponding keys interrupt service routine, data readback and time calibration be operated.
USB serial ports delivery module is essential in Practical Project, and this module employs USB and turns serial port chip, and by serial ports, temperature data is sent to host computer.
The present invention to realize method as follows:
Step one: each module initialization of system electrification；
Step 2: temperature collect module gathers ambient temperature corresponding voltage value, and after signal condition and A/D change, digital data transmission is carried out voltage to main control module and turn temperature data and process；
Step 3: obtain temperature data after controlling module computing and store, temperature data is sent to display module Dynamic Announce simultaneously；
Step 4: button is circulated scanning by main control module, when finding to have button to press, then enters corresponding keys interrupt service routine, data readback and time calibration is operated.
Step 5: carried out temperature data show by controlling module command display module, and turn serial ports by USB and temperature data is sent to host computer display monitors.
Advantages of the present invention:
(1) simple to operate, intelligent monitoring, with low cost；
(2) multi pass acquisition temperature, the bias current of each road is adjustable, compatible high, applied widely；
(3) having battery and the double mode power supply of USB serial ports, portability is strong；
(4) adopting low-voltage power supply, have voltage stabilizing function, temperature measurement accuracy is high；
(5) have that temperature is overproof and power supply electricity shortage auto-alarm function.
Accompanying drawing explanation
Fig. 1 is based on the infrared detector module multi way temperature Fundamentals of Supervisory Systems block diagram of diode thermometric；
Fig. 2 main control module circuit；
Fig. 3 power supply voltage stabilizing conditioning module circuit；
Fig. 4 temperature data acquisition modular circuit；
Fig. 5 data conditioning signaling module；
Fig. 6 display module circuit；
Fig. 7 data readback/time calibration key-press module circuit；
Fig. 8 USB serial ports delivery module circuit；
Fig. 9 multi way temperature monitoring process flow diagram flow chart.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail:
As it is shown in figure 1, the infrared detector module multi way temperature monitoring system of diode thermometric mainly includes ARMSTM32F101 main control module, thermometric diode temperature sensor module, Signal-regulated kinase, power supply voltage stabilizing adaptation module, LCD MODULE, data readback/time calibration key-press module, USB turn serial communication modular.Multichannel silicon thermometric diode temperature sensor is connected with Signal-regulated kinase, by sensor acquisition to voltage data deliver to Signal-regulated kinase and be amplified conditioning and obtain corresponding voltage signal.Signal-regulated kinase is connected with main control module, conditioned voltage signal is sent to 12 bit comparators that main control module carries and carries out A/D conversion, and it is digital signal that voltage signal carries out analog digital conversion.Voltage data after conversion carries out computing according to the relational expression of silicon diode voltage Yu temperature at main control module, draws digital temperature numerical value now.Again digital temperature data are stored in FLASH, and main control module is connected with LCD MODULE.The multichannel roll display of real-time digital temperature is carried out by main control module order LCD MODULE.Data readback and time calibration key-press module be connected with main control module, key-press module is carried out monitor in real time by main control module, when there being button to press, main control module data readback button is pressed or time calibration button press and judge.And the instruction sent according to button carry out data readback and time calibration function realization.USB turns serial communication modular and is connected with main control module, except data being displayed on a liquid crystal display, it is also possible to data were entered USB serial port module and is sent to host computer and displays and monitor.
As in figure 2 it is shown, the main control module that main control module circuit adopts is ARMSTM32F101.ST Microelectronics releases the processor STM32 based on ARM, and it is with ARMCortex-M3 for kernel, and this core center efficiency is high, and programming is simple, has outstanding determination and interrupts behavior.The main feature of STM32F103 processor is as follows: 1) low-power consumption: adopt 3.3V power voltage supply, embedded RTC clock, supports that low-power consumption mode runs.2) data-handling capacity is strong: maximum operation frequency 72MHZ, inside has monocycle hardware multiplier and divider.3) memory space is big: there is the FLASH of SRAM, 256KB of 64KB inside, supports outside extension.4) peripheral hardware aboundresources: have 2 IIC interfaces, 5 UART interface, 3 SPI interface, also has USB, CAN interface and 80 GPIO resources.Fully meet the extension of clock, house dog, button remote alarm interface.Compared with 8 single-chip microcomputers, being maintained with high integration and developing characteristic easily in conjunction with high-performance, low-power consumption and characteristic of low voltage.
As it is shown on figure 3, the employing of power supply voltage stabilizing conditioning module is dual power supply pattern, namely provide external power supply powering mode and battery powered mode, it is possible to switch over according to actual working condition.The power supply interference being easily subject between element of powering makes output voltage fluctuate up and down near output valve, and follow-up processing of circuit precision impact is bigger.For making voltage be maintained at stable state, have employed MAX14523AATA+ chip to carry out voltage stabilizing output at power supply module.MAX14523AATA+ is a analog signal conditioner chip of MAXIM company, being the chip with programmable current limiting switch feature, conducting resistance is 70m Ω, and input voltage range is 1.7V-5.5V, current limliting is adjustable ranges for 250mA-1.5A, it is possible to obtain stable output valve.No. 5 pin IN are the voltage input end of chip, and No. 7 pin ON are the enable port of chip, when input is for high voltage so that chip runs well, and No. 4 pins are output port of power source, are desirably exported stable voltage.No. 3 pins are overcurrent actuator, are used for regulating the numerical value of output port.Being inputted by MAX14523AATA+ No. 5 pin IN by the 5V power supply provided by USB, No. 7 Enable Pin ON connect high level makes chip start, and No. 3 end SETI, in the protective resistance of the indirect 300k with ground, are used for regulating port output.5V magnitude of voltage after No. 4 port OUT outputs are stable.Conventional battery powered voltage value is less, it is necessary to first it is carried out boosting process.TLV61220 is for being a chip aiming at battery-powered products offer power solution.By a non-essential resistance potentiometer, output voltage can be set.It is a 6 ultra-thin SOT-23 encapsulation of pin.No. 1 pin SW selects switch for boosting or current limliting, and No. 2 pin GND are grounding ports, and No. 3 pin EN are enable port, and No. 4 pin FB are the feedback pin of output voltage numerical value, and No. 5 pins are output voltage pin, and No. 6 pins are for treating booster power input pin.Adopting TLV61220 boost converter is 5V by being raised by the 3.7V voltage of lithium battery power supply, then 5V voltage input MAX14523AATA+ obtains the 5V voltage source of stable power-supplying.
As shown in Figure 4, what temperature data acquisition modular circuit adopted is that thermometric diode carries out data acquisition, and the temperature control of diode is high, it is common that every number of degrees millivolt, the linearity is good, it is possible to keep good linear relationship in very big temperature range.When thermometric, it is common that forward bias, impose constant current I0, operating point is in voltage saturation district, and the measurement error at this moment brought due to the instability of electric current is less, when the temperature varies, and its forward junction voltage VFChange therewith, VFIt is the function of temperature,This adds junction voltage expression formula during forward bias current for diode.When thermometric, being fixed by the operating current of thermometric diode, I is constant, and namely diode is in constant-current source state.Now the forward junction voltage of diode only has relation with temperature, here it is the principle of diode thermometric.Diode voltage signal in infrared detector module is acquired, so that it may calculate corresponding temperature.
As it is shown in figure 5, the signal that data conditioning signaling module circuit is mainly used in collecting is nursed one's health, the output of common sensor is less able to directly meet the needs of ADC input voltage.If the input range of ADC can not utilize fully, certainty of measurement will be lost.This circuit moves with level using amplifier that signal is implemented amplitude conversion, it is possible to meet ADC input voltage demand.Conditioning module have selected 4 amplifier combined chip TLV2474c of TI company.This chip adopts CMOS structure, full amplitude of oscillation input and output.The TLV2474c amplifier composition current source being wherein connected with diode provides stable bias current to diode, and TL431 as the reference voltage, is consistent according to the estimation of the selection of circuit structure form with side circuit parameter.
As shown in Figure 6, display module circuit is LCD MODULE.What the present invention selected is 12864B liquid crystal display, and 12864 is a kind of graphic dot matrix liquid crystal display, and it is mainly made up of the full lattice lcd display of line driver and row driver and 128 × 64.Figure can be completed show, it is also possible to show 8 × 4 (16 × 16 dot matrix) Chinese characters.Its display resolution is 128 × 64, utilizes this module interface mode flexibly and operational order simply and easily, may make up full Chinese man-machine interaction graphical interfaces and also can complete figure and show. Low-voltage Low-power is its another distinguishing feature.
As it is shown in fig. 7, data readback/time calibration key-press module circuit, contain two functions.After program is run, key part is carried out monitor in real time by main control module.When monitoring main menu button SW3 at the appointed time by, time next time, entering data readback function.SW5 represents and turns in data, and SW6 represents and looks under data；When monitoring main menu button SW3 and pressing twice at the appointed time, entry time calibration key-press module circuit, then is monitored button SW4, when pressing number of times at the appointed time and being one time, enter timing pattern, then subtract when realizing respectively with SW5 and SW6 with time add function.When pressing number of times and being twice, enter and adjust merotype, then realize respectively with SW5 and SW6 point subtracting and dividing adding function.When pressing number of times and being three times, enter second pattern of adjusting, then realize the second with SW5 and SW6 respectively and subtract and add function with the second.
It is illustrated in figure 8 USB serial ports delivery module circuit.Along with computer technology development serial ports and parallel port slowly on PC fewer and feweri.In Practical Project, serial ports is essential, is generally adopted USB and turns the next virtual serial ports of serial port chip.This circuit employs the FT232RLUSB of USB2.0 and turns serial port chip, and a outstanding USB that FT232 chip is FTDI company turns USART chip, in that context it may be convenient to usb signal conveniently converts to RS-232, RS422, RS485 signal/RS-232, RS422, RS485 signal converts usb signal to.FT232R internal main will by USB transceiver, SIE (SIE), usb protocol engine, first in first out (FIFO) controller, the part composition such as Baud rate generator, clock multiplier/driver, 3.3V Voltage stabilizing module, the agitator of internal 12MHz and UART Universal Asynchronous Receiver Transmitter (UART) controller.For with RS232 interface section, UART be mainly used to RS232 interface serial and concurrent between data conversion.FT232R provides complete signal so that it is have versatility, it is also possible to change with other communication mode except RS232.Two twoport fifo buffers within FT232R, one is the transmission buffer of 128 bytes, and another is the reception buffer of 256 bytes.They are all for the exchange buffering of usb data and RS232 data, and UARTFIFOController may be used for processing the data transmission between the two buffer and UART transmitting-receiving depositor.USB power source band overcurrent protection, adopts 500MA resettable fuse, has been internally integrated crystal oscillator and build-out resistor, and performance is more stable.
It is illustrated in figure 9 multi way temperature monitoring process flow diagram flow chart.System start-up operational mode after powering on, each equipment such as temperature collect module will initialize.Temperature detecting module will carry out diode voltage data acquisition, the analog voltage data collected be sent in main control module single-chip microcomputer and carries out analog digital conversion, and the relation according to voltage Yu temperature carries out temperature conversion and storage.The digital temperature obtained is sent to liquid crystal display go to display, and utilizes USB to turn Serial Port Line temperature data is sent to host computer to be monitored simultaneously.Button is circulated scanning by program, when finding to have button to press, then enters corresponding key services program, and it is processed.The button program of the present invention has been mainly menu function, and storage data are checked and amendment to the time.
Claims (6)
1. the infrared detector module multi way temperature based on diode thermometric monitors system, including main control module, power supply voltage stabilizing conditioning module, temperature collect module, Signal-regulated kinase, display module, data readback and time calibration key-press module and USB turn serial port module, it is characterized by:
In described multi way temperature monitoring system, multi-route measuring temperature diode is connected with Signal-regulated kinase, is amplified obtaining corresponding conditioned signal by the diode voltage signal collected；Signal-regulated kinase is connected with main control module, conditioned voltage signal is sent to 12 bit comparators that main control module carries and carries out A/D conversion, voltage signal is converted to digital signal；It is calculated obtaining corresponding digital temperature numerical value with temperature funtion relation according to voltage in main control module by the voltage data changed；And Temperature numerical is stored in FLASH；Main control module is connected with display module, main control module order LCD MODULE carry out real time temperature and show；USB turns serial port module and is connected with main control module, it is possible to by USB serial port module, data are sent to host computer and display and monitor.
2. a kind of infrared detector module multi way temperature based on diode thermometric according to claim 1 monitors system, it is characterised in that: described main control module adopts the STMicw Electronics STM32 series based on the microcontroller that Cortex-M3 is core.
3. a kind of infrared detector module multi way temperature based on diode thermometric according to claim 1 monitors system, it is characterized in that: described power supply voltage stabilizing conditioning module adopts dual power supply pattern, namely electric source modes and battery mould of powering switches over, and adopts voltage stabilizing chip to carry out voltage stabilizing running voltage output.
4. a kind of infrared detector module multi way temperature based on diode thermometric according to claim 1 monitors system, it is characterised in that: described temperature collect module is diode temperature sensor measuring circuit.
5. a kind of infrared detector module multi way temperature based on diode thermometric according to claim 1 monitors system, it is characterised in that: described Signal-regulated kinase use amplifier chip that small-signal is implemented enlarging function that amplitude conversion and level move with meet AD input voltage demand.
6. a kind of infrared detector module multi way temperature based on diode thermometric according to claim 1 monitors system, it is characterised in that: described signal display module adopts graphic dot matrix liquid crystal display.
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Application publication date: 20160720 |