CN102944323B - A kind of micro-temperature sensor based on true Root Mean square Converter - Google Patents
A kind of micro-temperature sensor based on true Root Mean square Converter Download PDFInfo
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- CN102944323B CN102944323B CN201210499606.5A CN201210499606A CN102944323B CN 102944323 B CN102944323 B CN 102944323B CN 201210499606 A CN201210499606 A CN 201210499606A CN 102944323 B CN102944323 B CN 102944323B
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- 238000004364 calculation method Methods 0.000 claims abstract description 17
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 14
- 239000010937 tungsten Substances 0.000 claims abstract description 14
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052802 copper Inorganic materials 0.000 claims abstract description 13
- 239000010949 copper Substances 0.000 claims abstract description 13
- 238000005498 polishing Methods 0.000 claims abstract description 13
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 10
- 239000000956 alloy Substances 0.000 claims abstract description 10
- 238000005070 sampling Methods 0.000 claims description 9
- 230000003321 amplification Effects 0.000 claims description 6
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 6
- 238000009826 distribution Methods 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 238000001228 spectrum Methods 0.000 claims description 4
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 230000035945 sensitivity Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 229910001361 White metal Inorganic materials 0.000 abstract description 2
- 239000010969 white metal Substances 0.000 abstract description 2
- 238000013461 design Methods 0.000 description 11
- 238000005259 measurement Methods 0.000 description 9
- 230000003287 optical effect Effects 0.000 description 5
- 230000005855 radiation Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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- Indication And Recording Devices For Special Purposes And Tariff Metering Devices (AREA)
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Abstract
The invention discloses a kind of micro-temperature sensor based on true Root Mean square Converter, comprise two sensors, sensor support bar and with the circuit board unit of true root mean square calculator AD637 for core calculations circuit; Described sensor comprises the white tungsten filament of polishing alloy and the support of diameter 8 μm, polishing white metal tungsten filament is used for measuring tempeature fluctuating signal, described support comprises silver-plated copper bar and high-temperature resistant tube, silver-plated copper bar one end arranges groove, high-temperature resistant tube is enclosed within high-temperature resistant tube outside, and the white tungsten filament two ends of polishing alloy are fixed in the groove of two silver-plated copper bars.The invention has the advantages that: by the application to true Root Mean square Converter AD637, simplify circuit structure, reduce cost of manufacture, ensure that the high sensitivity performance of micro-temperature sensor, there is very high precision, improve the accuracy measuring structure.
Description
Technical field
The invention belongs to a kind of electronic measuring instrument measuring atmospheric optical parameters, specifically a kind of micro-temperature sensor based on true Root Mean square Converter.It is mainly applicable to atmospheric science research, and the field such as meteorology, aviation, Laser Atmospheric Transmission, military affairs.
Background technology
Micro-temperature sensor is mainly used in atmospheric optical turbulence and measures.From early 1970s so far, the countries such as the U.S., Germany and India have developed series of temperature oscillometer, and the reliability and degree of ripeness of method of production constantly get a promotion.As, the micro-temperature sensor of the direct current bridge of Darryl and David design, the sounding balloon of Demos design and aircraft carry micro-temperature sensor etc. all can measurement of Atmospheric Turbulence profile.At home, Anhui Inst. of Optics and Fine Mechanics, Chinese Academy of Sciences has carried out micro-temperature sensor development work at first, a large amount of experimental study that utilized micro-temperature sensor to carry out, and obtains at home and generally approves.At the beginning of the eighties, Zeng Zongyong etc. develop a kind of intermittent power supply direct current bridge-type micro-temperature sensor, have carried out a large amount of Air Close To The Earth Surface optical turbulences and have measured, then have developed again temperature fluctuation sonde, measure for whole atmosphere optical turbulence profile.
Summary of the invention
The object of the invention is to provide a kind of micro-temperature sensor based on true Root Mean square Converter for the deficiencies in the prior art.
In order to achieve the above object, the present invention adopts following technical scheme:
Based on the micro-temperature sensor of true Root Mean square Converter, comprise two sensors, sensor support bar and with the circuit board unit of true root mean square calculator AD637 for core calculations circuit; Described sensor comprises the white tungsten filament of polishing alloy and the support of diameter 8 μm, polishing white metal tungsten filament is used for measuring tempeature fluctuating signal, described support comprises silver-plated copper bar and high-temperature resistant tube, silver-plated copper bar one end arranges groove, high-temperature resistant tube is enclosed within high-temperature resistant tube outside, the white tungsten filament two ends of polishing alloy are fixed in the groove of two silver-plated copper bars, and the two ends of described sensor support bar respectively support a sensor; Described sensor support bar unit adopts the aluminium-alloy pipe of long 1m; Circuit board unit comprises voltage difference measuring unit, filter and amplification unit and root mean square calculation unit; Voltage difference measuring unit mainly comprises constant current source, square wave circuit for generating, on-off circuit, sampling holder, Wheatstone bridge and differential amplifier circuit, the power-on time of Wheatstone bridge is controlled, for sensor batch (-type) provides continuous current by square wave circuit for generating and on-off circuit; Two sensors are as two gage beams of Wheatstone bridge, and its magnitude of voltage carries out Difference Calculation through differential amplifier circuit, obtains voltage differential signal; This voltage differential signal is the discontinuous signal with square-wave synchronous, after carrying out sampling, keep, amplifying, obtains continually varying signal, then carries out filtering and compensate amplifying through sampling holder; Filter and amplification unit arranges passband according to atmospheric turbulence spectrum distribution; Root mean square calculation unit carries out root mean square calculation to the signal that filter amplifying processing is crossed, and carries out bias compensation and impedance matching to output signal.
Advantage of the present invention and effect are:
The sensor of 1 micro-temperature sensor have employed special design, and sensor material has selected the white tungsten filament of polishing alloy of diameter 8 μm, reduces the measuring error that solar radiation is introduced, improves the response frequency of sensor; The groove of sensor stand adds effective contact area of tungsten filament and support, high-temperature resistant tube reduce support produce the impact of heat radiation on measuring accuracy.
2 in micro-temperature sensor circuit design, and by the root mean square of true root mean square calculator AD637 accounting temperature difference signal, chip internal is made up of analog device.Relative to digital computing circuit, this signal processing method simplifies circuit structure, reduces cost of manufacture, reduces the measuring error that digital-to-analog conversion is introduced, improves the measuring accuracy to atmospheric turbulence high frequency spectrum.
Accompanying drawing explanation
Fig. 1 is the sensor construction schematic diagram of the micro-temperature sensor based on true Root Mean square Converter;
Fig. 2 is the signal flow block diagram of the micro-temperature sensor based on true Root Mean square Converter;
Fig. 3 is that the present invention surveys Refractive-index-structure parameter diurnal variation situation in experiment place.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.
1, micro-temperature sensor design concept
Refractive-index-structure parameter is commonly used to describe the Fluctuation Strength of optical turbulence, can quantitative description atmospheric turbulence on the impact of light wave transmissions.According to the local uniformity isotropic theory of Kolmogorov, the computing formula that can obtain Refractive-index-structure parameter is as follows:
In formula: C
t 2for temperature structure constant, T is thermodynamic temperature, and P is atmospheric pressure, and r is the distance in 2, space, < [T (x+r)-T (x)]
2> is the ensemble average of the temperature difference square in 2, space.
From formula (1) and (2), if the ensemble average of air pressure P, temperature T, distance r and temperature difference is all known quantity, Refractive-index-structure parameter C can be calculated
n 2.Air pressure P and temperature T is measured can be obtained by conventional meteorologic instrument, uses the instrument such as meter ruler and vernier caliper can accurate distance r, and the ensemble average of temperature difference needs to carry out Inversion Calculation to the measurement data of micro-temperature sensor and obtains.
From said method, micro-temperature sensor should comprise two sensors and a block signal treatment circuit plate, and two sensors are used for the transient temperature of measurement space 2, and signal processing circuit board is used for temperature difference and the root mean square thereof of calculating sensor measurement.
2, based on the micro-temperature sensor sensor design of true Root Mean square Converter
With reference to figure 1, sensor construction schematic diagram of the present invention.In various temperature sensor, platinum resistance thermometer sensor, silk has higher response frequency and temperature coefficient, meet the requirement that temperature fluctuation is measured, therefore adopting tinsel resistor as micro-temperature sensor sensor, considering emphatically the requirement of micro-temperature sensor to sensitivity and response frequency two major parameters when carrying out selection wiry.Resistance wiry is larger, and the sensitivity of micro-temperature sensor is higher; Diameter wiry is less, and the response frequency of micro-temperature sensor is higher; Tinsel reflectivity is larger, and the impact of solar radiation on micro-temperature sensor measurement result is less.Based on above some and market supply ability, diameter is selected to be the polishing white tungsten filament making sensor of 8 μm.
Support Design must ensure: 1. tinsel is in atmosphere exposed; 2. atmospheric turbulence space structure is not destroyed; 3. the heat radiation of support release can be ignored impact wiry; 4. the resistance value of support in current return can be ignored.Therefore structural design as shown in Figure 1 selected by the support of sensor, comprise silver-plated copper bar 1 and high-temperature resistant tube 2, silver-plated copper bar 1 one end arranges groove 3, it is outside that high-temperature resistant tube 2 is enclosed within high-temperature resistant tube 2, polishing alloy white tungsten filament 4 two ends are fixed in the groove 3 of two silver-plated copper bars 1, the groove 3 of sensor stand adds effective contact area of the white tungsten filament of polishing alloy 4 and support, high-temperature resistant tube 2 reduce support produce the impact of heat radiation on measuring accuracy.
3, based on the micro-temperature sensor circuit design of true Root Mean square Converter
With reference to figure 2, according to the measuring principle of micro-temperature sensor, micro-temperature sensor circuit part functionally should realize: measure the voltage difference of two sensors and amplify and filtering it, then carry out root mean square calculation and export root-mean-squared, and reducing the impact of environment heat interchange to greatest extent by circuit design.Divide according to this function, circuit is divided into three unit, i.e. voltage difference measuring unit, filter and amplification unit and root mean square calculation unit.Voltage difference measuring unit mainly comprises constant current source, square wave circuit for generating, on-off circuit, sampling holder, Wheatstone bridge and differential amplifier circuit, the power-on time of Wheatstone bridge is controlled by square wave circuit for generating and on-off circuit, for sensor batch (-type) provides continuous current, equivalent current is not increased under the prerequisite improving working sensor electric current, effectively improve sensitivity, reduce the impact of tinsel Ohmic heating on measurement result simultaneously.Two sensors are as two gage beams of Wheatstone bridge, and its magnitude of voltage carries out Difference Calculation through differential amplifier circuit, obtains voltage differential signal.This voltage differential signal is the discontinuous signal with square-wave synchronous, after carrying out sampling, keep, amplifying, obtains continually varying signal, then carries out filtering and compensate amplifying through sampling holder.Filter amplification circuit arranges passband according to atmospheric turbulence spectrum distribution, according to the dynamic range of main chip reasonable classification measurement by magnification signal.Root mean square calculation unit carries out root mean square calculation to the signal that filter amplifying processing is crossed, and carries out bias compensation and impedance matching to output signal.According to as above mentality of designing, complete the circuit design of micro-temperature sensor.
4, the micro-temperature sensor based on true Root Mean square Converter makes and measures
Micro-temperature sensor is integrated, need sensor and circuit board electrically and physically effectively link together, sensor is arranged on rational position, and circuit board adds necessary packaging to meet the requirement of work and storage environment, is the interface needing the external unit connected to provide compatible.
The distance of two sensors is determined by the characteristic dimension of atmospheric turbulence, according to the regularity of distribution of Air Close To The Earth Surface turbulence characteristics yardstick, this distance is chosen to be 1 meter.Therefore, employing length is the aluminium-alloy pipe fixation of sensor of 1 meter, and passes in pipe with thin wire, connecting circuit board.Circuit board is screwed in waterproof plastic box, and is arranged on waterproof plastic box, as micro-temperature sensor and external unit connecting interface by 4 cores (+Vs ,-Vs, GND, Signal) Aviation Connector.
After completing based on the micro-temperature sensor of true Root Mean square Converter, select DT80 intelligent data acquisition unit collecting temperature oscillometer signal, carry out continuous coverage experiment, obtain 1 day around-the clock measurement data, to measurement data get 5 minutes average after, depict data diurnal variation curve figure, as shown in Figure 3.
Should be understood that, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection domain that all should belong to claims of the present invention.
Claims (1)
1. based on a micro-temperature sensor for true Root Mean square Converter, it is characterized in that, comprise two sensors, sensor support bar and with the circuit board unit of true root mean square calculator AD637 for core calculations circuit; Described sensor comprises the white tungsten filament of polishing alloy and the support of diameter 8 μm, the white tungsten filament of polishing alloy is used for measuring tempeature fluctuating signal, described support comprises silver-plated copper bar and high-temperature resistant tube, silver-plated copper bar one end arranges groove, it is outside that high-temperature resistant tube is enclosed within silver-plated copper bar, the white tungsten filament two ends of polishing alloy are fixed in the groove of two silver-plated copper bars, and the two ends of described sensor support bar respectively support a sensor; Described sensor support bar adopts the aluminium-alloy pipe of long 1m; Circuit board unit comprises voltage difference measuring unit, filter and amplification unit and root mean square calculation unit; Voltage difference measuring unit comprises constant current source, square wave circuit for generating, on-off circuit, sampling holder, Wheatstone bridge and differential amplifier circuit, the power-on time of Wheatstone bridge is controlled by square wave circuit for generating and on-off circuit, for sensor batch (-type) provides electric current, when having an electric current, current value is all equal; Two sensors are as two gage beams of Wheatstone bridge, and its magnitude of voltage carries out Difference Calculation through differential amplifier circuit, obtains voltage differential signal; This voltage differential signal is the discontinuous signal with square-wave synchronous, after carrying out sampling, keep, amplifying, obtains continually varying signal, then carries out filtering and compensate amplifying through sampling holder; Filter and amplification unit arranges passband according to atmospheric turbulence spectrum distribution; Root mean square calculation unit carries out root mean square calculation to the signal that filter amplifying processing is crossed, and carries out bias compensation and impedance matching to output signal.
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| CN113654689A (en) * | 2021-08-11 | 2021-11-16 | 山西大学 | Contact measurement method for high-temperature gas temperature based on steady-state energy flow balance relation |
| CN114577356A (en) * | 2022-03-07 | 2022-06-03 | 长春理工大学 | High-sensitivity all-weather platinum wire resistance type temperature pulsation instrument based on gray wolf compensation algorithm |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2929679Y (en) * | 2006-06-23 | 2007-08-01 | 中国石油天然气集团公司 | Temperature measurer |
| CN102721479A (en) * | 2012-04-16 | 2012-10-10 | 沈阳华岩电力技术有限公司 | Online monitoring method for temperature rise of outdoor electrical device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2000241258A (en) * | 1999-02-25 | 2000-09-08 | T & D:Kk | Temperature measuring device and measuring method |
| US6919729B2 (en) * | 2003-01-06 | 2005-07-19 | Rohrback Cosasco Systems, Inc. | Corrosivity measuring device with temperature compensation |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2929679Y (en) * | 2006-06-23 | 2007-08-01 | 中国石油天然气集团公司 | Temperature measurer |
| CN102721479A (en) * | 2012-04-16 | 2012-10-10 | 沈阳华岩电力技术有限公司 | Online monitoring method for temperature rise of outdoor electrical device |
Non-Patent Citations (1)
| Title |
|---|
| 基于真均方根转换器的温度脉动仪设计;张志刚 等;《计算机测量与控制》;20120930;第20卷(第9期);第2577-2580页 * |
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