CN107402314A - Temp measuring method and system based on hot-wire anemometer - Google Patents
Temp measuring method and system based on hot-wire anemometer Download PDFInfo
- Publication number
- CN107402314A CN107402314A CN201710768812.4A CN201710768812A CN107402314A CN 107402314 A CN107402314 A CN 107402314A CN 201710768812 A CN201710768812 A CN 201710768812A CN 107402314 A CN107402314 A CN 107402314A
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- Prior art keywords
- hot
- circuit
- probe
- temperature
- hot wire
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/10—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring thermal variables
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/18—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer
Abstract
The invention discloses a kind of temp measuring method based on hot-wire anemometer, according to the thermal resistance effect of hot wire probe, the changing rule of acquisition hot wire probe temperature and both end voltage；The voltage signal of hot wire probe both ends output based on acquisition is finally transmitted to computer successively through overmodulated circuit, amplifying circuit, D/A converting circuit, completes the temperature survey operation of hot-wire anemometer.This method can solve the problem that temperature Rate's synchronous measurement technique in turbulent flow research, realize the feasibility and accuracy of the high frequency measurement of temperature.The invention also discloses a kind of temp measuring system based on hot-wire anemometer.
Description
Technical field
The present invention relates to thermometry field, and hot-wire anemometer temp measuring method and system are based on more particularly to one kind.
Background technology
In the research of the turbulent boundary layer of rotating machinery, it is necessary to speed and temperature synchro measure.Conventional hot line wind
Fast instrument can solve the problems, such as tachometric survey, and sample frequency it is higher (>2000Hz).But for the measurement of temperature, then always
Since be all a more difficult problem.
Currently used thermometry has two ways, and one kind is thermocouple temperature measurement, and one kind is Thermistor Temperature Measurement.For height
Frequency temperature survey, there is larger requirement to the size of temperature probe.If volume is excessive, its thermal inertia is big, and response frequency is low, nothing
Method realizes high frequency measurement；If volume is too small, output signal is smaller, and signal to noise ratio is relatively low, can not equally realize the high accuracy of temperature
Measurement.
The content of the invention
Based on this, it is necessary to the problem of existing for conventional art, there is provided a kind of temp measuring method based on hot-wire anemometer
And device, temperature Rate's synchronous measurement technique in turbulent flow research is can solve the problem that, realizes the feasibility of the high frequency measurement of temperature
With accuracy.
In a first aspect, the embodiments of the invention provide a kind of temp measuring method based on hot-wire anemometer, methods described includes：
According to the thermal resistance effect of hot wire probe, the changing rule of the hot wire probe temperature and both end voltage is obtained；Institute based on acquisition
The voltage signal of hot wire probe both ends output is stated successively through overmodulated circuit, amplifying circuit, D/A converting circuit, is finally transmitted to
Computer, complete the temperature survey operation of hot-wire anemometer.
In one of the embodiments, the hot wire probe is the heated filament for measuring turbulent flow, wherein, the heated filament size
For 1.25mm it is long, 5 μm it is thick.
In one of the embodiments, completing the temperature survey operation of hot-wire anemometer includes：Based on the heat to test the speed
Line probe, by two-way probe, the synchro measure of completion temperature and speed；Wherein, the two-way probe tests the speed all the way, a drive test
Temperature.
Second aspect, the embodiments of the invention provide a kind of computer-readable recording medium, the computer-readable storage
Be stored with computer program on medium, the computer program realized when being executed by processor above-mentioned first aspect based on hot line
The temp measuring method of anemobiagraph.
The third aspect, the embodiments of the invention provide a kind of computer program product for including instruction, when the computer journey
When sequence product is run on computers so that computer performs the method described in above-mentioned first aspect.
Fourth aspect, the embodiment of the present invention additionally provide the retrieval and download of a kind of application program based on terminal device
System, the system include：Hot wire probe, constant-current source, precision resistance, modulation circuit, amplifying circuit, D/A converting circuit and
Computer, the voltage signal of the hot wire probe both ends output pass through the modulation circuit, the amplifying circuit and institute successively
D/A converting circuit is stated, is finally transmitted to the computer；Wherein, the hot wire probe, for measuring turbulent flow, the modulation electricity
Road produces 4.096V reference power source using TL431 and potentiometer VR1 regulations, and measurement electricity is formed using R1, R2, VR2, Pt100
Bridge, when Pt100 resistance value and unequal VR2 resistance value, the measuring bridge exports the pressure difference signal of a mV level, institute
State the voltage signal that pressure difference signal exports default desired value size after amplifying circuit amplifier LM324 amplifications, the electricity
Pressure signal is connected directly to the D/A converting circuit AD conversion chip.
In one of the embodiments, in addition to：Differential amplifier circuit, R3=R4, R5=in the differential amplifier circuit
R6；Multiplication factor=R5/R3 of the differential amplifier circuit, amplifier are powered using single 5V.
In one of the embodiments, the hot wire probe is 1.25mm length, 5 μm of thick heated filaments.
In one of the embodiments, the heated filament response frequency maximum is 2000Hz.
In one of the embodiments, R1=R2, VR2 are 100 Ω precision resistances.
A kind of temp measuring method and system based on hot-wire anemometer provided by the invention, imitated according to the thermal resistance of hot wire probe
Should, the changing rule of acquisition hot wire probe temperature and both end voltage；The voltage signal of hot wire probe both ends output based on acquisition
Successively through overmodulated circuit, amplifying circuit, D/A converting circuit, computer is finally transmitted to, completes the temperature of hot-wire anemometer
Measurement operation.This method can solve the problem that temperature Rate's synchronous measurement technique in turbulent flow research, realize the high frequency measurement of temperature
Feasibility and accuracy.
Brief description of the drawings
Fig. 1 is a kind of schematic flow sheet of temp measuring method based on hot-wire anemometer in one embodiment of the invention；With
And
Fig. 2 is the circuit diagram in a kind of temp measuring system based on hot-wire anemometer in one embodiment of the invention.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with drawings and Examples pair
Temp measuring method and system of the present invention based on hot-wire anemometer are further elaborated.It is it should be appreciated that described herein
Specific embodiment only to explain the present invention, is not intended to limit the present invention.
As shown in figure 1, the schematic flow sheet for a kind of temp measuring method based on hot-wire anemometer in one embodiment.Tool
Body comprises the following steps：
Step 102, according to the thermal resistance effect of hot wire probe, the changing rule of hot wire probe temperature and both end voltage is obtained.
In the present embodiment, hot wire probe is the heated filament for measuring turbulent flow, wherein, heated filament size is 1.25mm length, 5 μm
Slightly.
Step 104, the voltage signal of the hot wire probe both ends output based on acquisition is successively through overmodulated circuit, amplification electricity
Road, D/A converting circuit, are finally transmitted to computer, complete the temperature survey operation of hot-wire anemometer.
In the present embodiment, the temperature survey operation into hot-wire anemometer includes：Based on the hot wire probe to test the speed, pass through two-way
Probe, complete the synchro measure of temperature and speed；Wherein, two-way probe tests the speed all the way, a channel Temperature Measuring.
A kind of temp measuring method based on hot-wire anemometer provided by the invention, according to the thermal resistance effect of hot wire probe, obtain
The changing rule of hot wire probe temperature and both end voltage；The voltage signal of hot wire probe both ends output based on acquisition passes through successively
Modulation circuit, amplifying circuit, D/A converting circuit, are finally transmitted to computer, complete the temperature survey operation of hot-wire anemometer.
This method can solve the problem that temperature Rate's synchronous measurement technique in turbulent flow research, realize temperature high frequency measurement feasibility with
Accuracy.
Based on same inventive concept, a kind of temp measuring system based on hot-wire anemometer is additionally provided.Because this system solves
The principle of problem is similar to a kind of foregoing temp measuring method based on hot-wire anemometer, and therefore, the implementation of the system can be according to preceding
The specific steps time limit of method is stated, part is repeated and repeats no more.
As shown in Fig. 2 it is the circuit diagram in a kind of temp measuring system based on hot-wire anemometer in one embodiment.
The temp measuring system 10 based on hot-wire anemometer includes：Hot wire probe, constant-current source, precision resistance, modulation circuit, amplifying circuit,
D/A converting circuit and computer, the voltage signal of hot wire probe both ends output is successively by the modulation circuit, amplification electricity
Road and the D/A converting circuit, are finally transmitted to computer.Wherein, hot wire probe, for measuring turbulent flow, modulation circuit is adopted
4.096V reference power source is produced with TL431 and potentiometer VR1 regulations, measuring bridge is formed using R1, R2, VR2, Pt100, when
When Pt100 resistance value and unequal VR2 resistance value, measuring bridge exports the pressure difference signal of a mV level, pressure difference signal warp
The voltage signal for presetting desired value size is exported after crossing amplifying circuit amplifier LM324 amplifications, voltage signal is connected directly to described
D/A converting circuit AD conversion chip.
In the present embodiment, hot wire probe is 1.25mm length, 5 μm of thick heated filaments；Heated filament response frequency maximum is 2000Hz.
Further, R1=R2, VR2 are 100 Ω precision resistances.
In one embodiment, a kind of temp measuring system based on hot-wire anemometer that the disclosure proposes also includes：It is differential to put
Big circuit, R3=R4, R5=R6 in differential amplifier circuit；Multiplication factor=R5/R3 of differential amplifier circuit, amplifier is using single
5V powers.
In order to which clearer understanding is with applying the temp measuring system proposed by the present invention based on hot-wire anemometer, carry out with shown below
Example.It should be noted that protection scope of the present invention does not limit to the example below.
Specifically, a kind of temp measuring system based on hot-wire anemometer that the disclosure proposes includes：Hot wire probe, constant-current source,
Precision resistance, modulation circuit, amplifying circuit, D/A converter module, computer.Hot wire probe applies to the special of turbulence modulation
Probe, its size are 1.25mm length, 5 μm of thick heated filaments, are represented in circuit diagram with PT100.
It should be noted that temperature-measurement principle is：Circuit produces 4.096V reference using TL431 and potentiometer VR1 regulations
Power supply；Measuring bridge is formed using R1, R2, VR2, Pt100, wherein R1=R2, VR2 are 100 Ω precision resistances, when Pt100's
When resistance value and unequal VR2 resistance value, electric bridge exports the pressure difference signal of a mV level, and this pressure difference signal passes through amplifier
The voltage signal of desired size is exported after LM324 amplifications, the signal can directly connect AD conversion chip.R3=in differential amplifier circuit
R4, R5=R6, multiplication factor=R5/R3, amplifier are powered using single 5V.
According to the thermal resistance effect of heated filament, it is possible to achieve the changing rule of hot-wire temperature and both end voltage；Heated filament both ends export
Voltage signal successively through overmodulated circuit, amplifying circuit, eventually pass through digital-to-analogue conversion, be delivered to computer；It is final to realize temperature
The measurement of degree.
Compared with prior art, the heated filament of temperature is base to a kind of temp measuring system based on hot-wire anemometer that the disclosure proposes
In the hot wire probe that tests the speed, using two-way probe, test the speed all the way, a channel Temperature Measuring, you can realize temperature, speed sync measurement；Heated filament
Small volume, response frequency is high, up to 2000Hz, the high frequency measurement of temperature can be achieved, meet the research of turbulent flow；Surveyed using electric bridge
Temperature, and pressure difference is exported, can abate the noise interference, ensure under the conditions of low-resistance, realize high precision measuring temperature.
The embodiment of the present invention additionally provides a kind of computer-readable recording medium.Stored on the computer-readable recording medium
There is computer program, the program is by computing device in Fig. 1.
The embodiment of the present invention additionally provides a kind of computer program product for including instruction.When the computer program product exists
When being run on computer so that the method that computer performs above-mentioned Fig. 1.
One of ordinary skill in the art will appreciate that realize all or part of flow in above-described embodiment method, being can be with
The hardware of correlation is instructed to complete by computer program, described program can be stored in a computer read/write memory medium
In, the program is upon execution, it may include such as the flow of the embodiment of above-mentioned each method.Wherein, described storage medium can be magnetic
Dish, CD, read-only memory (Read-Only Memory, ROM) or random access memory (RandomAccess
Memory, RAM) etc..
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope that this specification is recorded all is considered to be.
Embodiment described above only expresses the several embodiments of the present invention, and its description is more specific and detailed, but simultaneously
Therefore the limitation to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that for one of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the guarantor of the present invention
Protect scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (8)
1. a kind of temp measuring method based on hot-wire anemometer, methods described include：
According to the thermal resistance effect of hot wire probe, the changing rule of the hot wire probe temperature and both end voltage is obtained；
The voltage signal of hot wire probe both ends output based on acquisition turns through overmodulated circuit, amplifying circuit, digital-to-analogue successively
Circuit is changed, is finally transmitted to computer, completes the temperature survey operation of hot-wire anemometer.
2. according to the method for claim 1, wherein, the hot wire probe is the heated filament for measuring turbulent flow, wherein, it is described
Heated filament size be 1.25mm it is long, 5 μm it is thick.
3. according to the method for claim 1, wherein, completing the temperature survey operation of hot-wire anemometer includes：Based on testing the speed
The hot wire probe, by two-way probe, complete the synchro measure of temperature and speed；Wherein, the drive test of two-way probe one
Speed, a channel Temperature Measuring.
4. a kind of temp measuring system based on hot-wire anemometer, the system include：Hot wire probe, constant-current source, precision resistance, modulation
Circuit, amplifying circuit, D/A converting circuit and computer, the voltage signal of the hot wire probe both ends output pass through institute successively
Modulation circuit, the amplifying circuit and the D/A converting circuit are stated, is finally transmitted to the computer；
Wherein, the hot wire probe, for measuring turbulent flow, the modulation circuit is produced using TL431 and potentiometer VR1 regulations
4.096V reference power source, measuring bridge is formed using R1, R2, VR2, Pt100, when Pt100 resistance value and VR2 resistance value
When unequal, the measuring bridge exports the pressure difference signal of a mV level, and the pressure difference signal passes through the amplifying circuit amplifier
The voltage signal of default desired value size is exported after LM324 amplifications, the voltage signal is connected directly to the digital-to-analogue conversion electricity
Road AD conversion chip.
5. system according to claim 4, in addition to：Differential amplifier circuit, R3=R4, R5 in the differential amplifier circuit
=R6；
Multiplication factor=R5/R3 of the differential amplifier circuit, amplifier are powered using single 5V.
6. system according to claim 4, wherein, the hot wire probe is 1.25mm length, 5 μm of thick heated filaments.
7. the system according to claim 4 or 6, wherein, the heated filament response frequency maximum is 2000Hz.
8. system according to claim 4, wherein, R1=R2, VR2 are 100 Ω precision resistances.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710768812.4A CN107402314A (en) | 2017-08-31 | 2017-08-31 | Temp measuring method and system based on hot-wire anemometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710768812.4A CN107402314A (en) | 2017-08-31 | 2017-08-31 | Temp measuring method and system based on hot-wire anemometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107402314A true CN107402314A (en) | 2017-11-28 |
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ID=60397158
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710768812.4A Pending CN107402314A (en) | 2017-08-31 | 2017-08-31 | Temp measuring method and system based on hot-wire anemometer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111829691A (en) * | 2020-06-29 | 2020-10-27 | 中国辐射防护研究院 | Device and method for transient measurement of wind temperature of non-neutral boundary layer |
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| CN201387346Y (en) * | 2009-03-06 | 2010-01-20 | 温州市安能机械有限公司 | Hot wire type air-flow meter |
| EP2267417A1 (en) * | 2003-01-16 | 2010-12-29 | Dwyer Instruments, Inc. | Sensor temperature control in a thermal anemometer |
| CN105242073A (en) * | 2015-10-26 | 2016-01-13 | 南京航空航天大学 | Constant temperature hot wire wind-velocity indicator detection system |
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2017
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Patent Citations (3)
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|---|---|---|---|---|
| EP2267417A1 (en) * | 2003-01-16 | 2010-12-29 | Dwyer Instruments, Inc. | Sensor temperature control in a thermal anemometer |
| CN201387346Y (en) * | 2009-03-06 | 2010-01-20 | 温州市安能机械有限公司 | Hot wire type air-flow meter |
| CN105242073A (en) * | 2015-10-26 | 2016-01-13 | 南京航空航天大学 | Constant temperature hot wire wind-velocity indicator detection system |
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| CN111829691A (en) * | 2020-06-29 | 2020-10-27 | 中国辐射防护研究院 | Device and method for transient measurement of wind temperature of non-neutral boundary layer |
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| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: You Ruquan Inventor after: Li Haiwang Inventor after: Tao Zhi Inventor after: Wei Kuan Inventor before: Tao Zhi Inventor before: Li Haiwang Inventor before: You Ruquan Inventor before: Wei Kuan |
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20171128 |