CN109682493A - A kind of dual chip passive wireless acoustic surface wave temperature transducer and its temp measuring method - Google Patents
A kind of dual chip passive wireless acoustic surface wave temperature transducer and its temp measuring method Download PDFInfo
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- CN109682493A CN109682493A CN201910153500.1A CN201910153500A CN109682493A CN 109682493 A CN109682493 A CN 109682493A CN 201910153500 A CN201910153500 A CN 201910153500A CN 109682493 A CN109682493 A CN 109682493A
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- temperature
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- type surface
- wave sensor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/22—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using measurement of acoustic effects
- G01K11/26—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using measurement of acoustic effects of resonant frequencies
- G01K11/265—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using measurement of acoustic effects of resonant frequencies using surface acoustic wave [SAW]
Abstract
The invention discloses a kind of dual chip passive wireless acoustic surface wave temperature transducer and its temp measuring methods, comprising: two resonator type surface acoustic wave sensor chips in parallel；One of resonator type surface acoustic wave sensor chip is positive temperature coefficient, another resonator type surface acoustic wave sensor chip is negative temperature coefficient.It is in a linear relationship to calculate out temperature value by two chip resonant frequency difference values and temperature in the present invention, it can be avoided initial temperature caused by causing the frequency originated to change because of changes in environmental conditions and change, temperature measurement accuracy can be improved.
Description
Technical field
The invention belongs to sound table device applicating developing technology field, in particular to a kind of dual chip passive wireless acoustic surface waves
Temperature transducer and its temp measuring method.
Background technique
With the rapid development of our country's economy, electricity supply increasingly increases, and modern electric is fast towards high voltage, large capacity
Speed development, the safety of electric system and efficiency operation are related to the development of entire national economy and the stabilization of people's lives.For
The safe operation of power grid and the optimum use scheme of power system resource are implemented, and most efficient method is carried out to power equipment
Monitoring；Wherein, temperature is one of the significant data for needing to monitor.
Power equipment temperature rise is mainly as caused by the electric current for flowing through cable.For normal current in cable, power equipment
Temperature can be maintained at certain level.When there is node that short circuit or insulation ag(e)ing occurs in power equipment, feature is showed
Be exactly local pyrexia at this, temperature anomaly increases；Then electric shock expansion oxidation increases node-resistance, in calorific value further
It rises, temperature continues to increase, and forms a vicious circle.Therefore, pass through the monitoring to power equipment temperature, i.e., knowable power train
The load condition of system operation；By integrating electric network information resource, the maximization of power information and resource-sharing may be implemented, sending out
The first time of generating apparatus hidden danger can find and handle hidden danger, and in the case where guaranteeing power system security operation, improve
The efficiency that electric power network transmits electric power.
Currently, the thermometric of power system device generallys use surface acoustic wave (SAW, Surface Acoustic Wave) skill
Art, the technology have the advantages that physicochemical characteristics is stablized, long service life；SAW sensor should side using feeling of passivity
Formula drives without battery；It is wirelessly connected between sensor and acquisition equipment, does not influence system insulation performance, it is highly-safe；Linearly
It spends.Sound surface wave sensor chip is to be made in quartz crystal piezoelectric material by semiconductor planar technique, mode of resonance
The surface acoustic wave sensor relationship linear in certain temperature range using the change of resonance frequency and the change of temperature, when same
After acoustical signal is transformed into the output of wireless answering signal by piezoelectric effect by one energy converter, so that it may be changed by measurement frequency
Obtain temperature value.The variation of the technology frequency change and temperature value is substantially fixation by design, but existing sound table
Surface wave mode of resonance temperature sensor due to by ambient temperature humidity influenced and with service life increase, the frequency of starting point
Rate can change, and the temperature value of starting point is caused to change, and will lead to temperature measurement accuracy reduction in this way.
Summary of the invention
The purpose of the present invention is to provide a kind of dual chip passive wireless acoustic surface wave temperature transducer and its temp measuring method,
To solve above-mentioned technical problem.Surface acoustic wave temperature transducer of the invention can be improved temperature measurement accuracy.
In order to achieve the above objectives, the invention adopts the following technical scheme:
A kind of dual chip passive wireless acoustic surface wave temperature transducer, comprising: two resonator type surface acoustic wave sensor cores
Piece；
Described two resonator type surface acoustic wave sensor chips are in parallel；
One of resonator type surface acoustic wave sensor chip is positive temperature coefficient, another resonator type surface acoustic wave passes
Sensor chip is negative temperature coefficient.
In the present invention, described two resonator type surface acoustic wave sensor chips are in addition to crystal is tangentially inconsistent, remaining work
Skill and technical conditions are consistent.
It is linear by described two resonator type surface acoustic wave sensor chip resonant frequency difference values and temperature in the present invention
Relationship calculates temperature.
In the present invention, the formula of temperature is calculated are as follows:
T=T0+ Ka Δ (F2-F1),
In formula, T represents the temperature value of measurement, T0Initial temperature is represented, Ka represents dual chip frequency-temperature coefficient, Δ (F2-
F1 the variable quantity of the difference of two chip resonance frequencies) is represented.
A kind of temp measuring method of dual chip passive wireless acoustic surface wave temperature transducer of the invention, by described two humorous
Vibration shape sound surface wave sensor chip resonant frequency difference value and temperature measuring and calculating temperature in a linear relationship.
In temp measuring method of the present invention, the formula of temperature is calculated are as follows: T=T0+ Ka Δ (F2-F1),
In formula, T represents the temperature value of measurement, T0Initial temperature is represented, Ka represents dual chip frequency-temperature coefficient, F1: generation
F2: the resonance frequency of the one of resonator type surface acoustic wave sensor chip of table represents another resonator type surface acoustic wave sensing
The resonance frequency of device chip, Δ (F2-F1) represent the variable quantity of the difference of two chip resonance frequencies.
Compared with prior art, the invention has the following advantages:
Surface acoustic wave temperature transducer of the invention includes two resonator type surface acoustic wave sensor chips, a mode of resonance
Sound surface wave sensor chip is positive temperature coefficient, another resonator type surface acoustic wave sensor chip is negative temperature coefficient,
It is in a linear relationship to calculate out temperature value by two chip resonant frequency difference values and temperature.In the present invention, two mode of resonance
Relatively, chip material is other than crystal is tangentially inconsistent, other techniques, technology item for sound surface wave sensor chip frequency
Part is consistent, therefore as external environment changes, although initial frequency changes, the trend of two chips variation is one
It causes, their initial frequency difference can't change, and avoid because changes in environmental conditions causes the frequency variation of starting
Lead to the variation of initial temperature, to improve temperature measurement accuracy.
Temp measuring method of the invention, it is in a linear relationship to calculate out temperature by two chip resonant frequency difference values and temperature
Angle value can be avoided because changes in environmental conditions causes the frequency variation of starting to lead to the variation of initial temperature, temperature survey can be improved
Accuracy of measurement.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of one-port resonator chip in the prior art；
Fig. 2 is resonance frequency and temperature proportional relationship schematic diagram in the prior art；
Fig. 3 is two mode of resonance sound in a kind of dual chip passive wireless acoustic surface wave temperature transducer of the embodiment of the present invention
Surface wave sensor chip parallel connection schematic diagram；
Fig. 4 is two mode of resonance sound in a kind of dual chip passive wireless acoustic surface wave temperature transducer of the embodiment of the present invention
The frequency temperature curve synoptic diagram of surface wave sensor chip；
Fig. 5 is two mode of resonance sound in a kind of dual chip passive wireless acoustic surface wave temperature transducer of the embodiment of the present invention
The frequency difference and temperature curve schematic diagram of surface wave sensor chip；
Fig. 6 is the structural schematic diagram of DR426.5 chip in the embodiment of the present invention；
Fig. 7 is the structural schematic diagram of DR428 chip in the embodiment of the present invention.
Specific embodiment
Invention is further described in detail in the following with reference to the drawings and specific embodiments.
Comparative example
Fig. 1 and Fig. 2 are please referred to, under normal circumstances, the resonance frequency of current single ended resonant type sound table wave sensor chip
With temperature direct proportionality.It can be according to formula T=T0+ K Δ f calculates temperature；In formula, T represents the temperature value of measurement, T0Generation
Table initial temperature, K represent frequency-temperature coefficient, and Δ f represents frequency variation.Due to by ambient temperature humidity influenced and with
The increase of service life, the frequency of starting point can change, cause initial temperature value to change, will lead to actual temperature
Accuracy decline.
Please refer to Fig. 3, Fig. 6 and Fig. 7, a kind of dual chip passive wireless acoustic surface wave temperature transducer of the invention, comprising:
Two resonator type surface acoustic wave sensor chips in parallel, by taking DR426.5, DR428 dual chip as an example, by " IN " of DR426.6
End is connected with the end " IN " of DR428 chip, and is connected to extraneous input signal end, at the same by the end " OUT " of DR426.6 and
End " OUT " of DR428 chip is connected, and is connected to extraneous aerial signal end, and all " GROUND " terminates ground wire.Wherein
One resonator type surface acoustic wave sensor chip is positive temperature coefficient, another resonator type sound surface wave sensor chip is
Negative temperature coefficient.
It is in a linear relationship by two chip resonant frequency difference values and temperature, according to formula T=T0+ Ka Δ (F2-F1) is surveyed
Temperature is calculated, T represents the temperature value of measurement, T0Initial temperature is represented, Ka represents dual chip frequency-temperature coefficient, F1: representing chip 1
Resonance frequency, F2: representing the resonance frequency of chip 2, and Δ (F2-F1) represents the variable quantity of the difference of two chip resonance frequencies.Cause
Relatively for two resonator type surface acoustic wave sensor chip frequencies, chip material in addition to crystal it is tangential it is inconsistent other than,
His technique, technical conditions are consistent, therefore as external environment changes, although initial frequency changes, two chips
The trend of variation is consistent, their initial frequency difference will not change, avoid from this because of changes in environmental conditions
Cause the frequency variation of starting to lead to the variation of initial temperature, improves temperature measurement accuracy.
In conclusion surface acoustic wave temperature transducer of the invention includes two resonator type surface acoustic wave sensor chips,
One resonator type surface acoustic wave sensor chip is positive temperature coefficient, another resonator type surface acoustic wave sensor chip is negative
Temperature coefficient, it is in a linear relationship to calculate out temperature value by two chip resonant frequency difference values and temperature.In the present invention, two
Relatively, chip material is other than crystal is tangentially inconsistent, other works for a resonator type surface acoustic wave sensor chip frequency
Skill, technical conditions are consistent, therefore as external environment changes, although initial frequency changes, two chip variations
Trend be consistent, their initial frequency difference can't change, and avoid because changes in environmental conditions causes to originate
Frequency variation lead to the variation of initial temperature, to improve temperature measurement accuracy.Temp measuring method of the invention passes through two
Chip resonant frequency difference value and temperature are in a linear relationship to calculate out temperature value, can be avoided because changes in environmental conditions has caused
The frequency variation of beginning leads to the variation of initial temperature, and temperature measurement accuracy can be improved.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
A specific embodiment of the invention is only limitted to this, for those of ordinary skill in the art to which the present invention belongs, is not taking off
Under the premise of from present inventive concept, several simple deduction or replace can also be made, all shall be regarded as belonging to the present invention by institute
Claims of submission determine scope of patent protection.
Claims (8)
1. a kind of dual chip passive wireless acoustic surface wave temperature transducer characterized by comprising two resonator type surface acoustic waves
Sensor chip；
Described two resonator type surface acoustic wave sensor chips are in parallel；
One of resonator type surface acoustic wave sensor chip is positive temperature coefficient, another resonator type surface acoustic wave sensor
Chip is negative temperature coefficient.
2. a kind of dual chip passive wireless acoustic surface wave temperature transducer according to claim 1, which is characterized in that described
For two resonator type surface acoustic wave sensor chips in addition to crystal is tangentially inconsistent, remaining technique and technical conditions are consistent.
3. a kind of dual chip passive wireless acoustic surface wave temperature transducer according to claim 1, which is characterized in that pass through
Described two resonator type surface acoustic wave sensor chip resonant frequency difference values and temperature measuring and calculating temperature in a linear relationship.
4. a kind of dual chip passive wireless acoustic surface wave temperature transducer according to claim 3, which is characterized in that measuring and calculating
The formula of temperature are as follows:
T=T0+ Ka Δ (F2-F1),
In formula, T represents the temperature value of measurement, T0Initial temperature is represented, Ka represents dual chip frequency-temperature coefficient, Δ (F2-F1) generation
The variable quantity of the difference of two chip resonance frequency of table.
5. a kind of dual chip passive wireless acoustic surface wave temperature transducer according to claim 1, which is characterized in that described
Two resonator type surface acoustic wave sensor chips are in parallel specifically: DR426.5, DR428 dual chip are in parallel.
6. a kind of dual chip passive wireless acoustic surface wave temperature transducer according to claim 5, which is characterized in that
End " IN " of DR426.6 is connected with the end " IN " of DR428 chip, then connects extraneous input signal end；DR426.6's
" OUT " is held to be connected with the end " OUT " of DR428 chip, then connects extraneous aerial signal end；All " GROUND " terminations
Ground wire.
7. a kind of temp measuring method of dual chip passive wireless acoustic surface wave temperature transducer described in claim 1, feature exist
In passing through described two resonator type surface acoustic wave sensor chip resonant frequency difference values and temperature measuring and calculating temperature in a linear relationship.
8. a kind of temp measuring method of dual chip passive wireless acoustic surface wave temperature transducer according to claim 7, special
Sign is,
Calculate the formula of temperature are as follows:
T=T0+ Ka Δ (F2-F1),
In formula, T represents the temperature value of measurement, T0Initial temperature is represented, Ka represents dual chip frequency-temperature coefficient, F1: represented wherein
F2: the resonance frequency of one resonator type surface acoustic wave sensor chip represents another resonator type surface acoustic wave sensor chip
Resonance frequency, Δ (F2-F1) represents the variable quantity of the difference of two chip resonance frequencies.
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| CN201910153500.1A CN109682493A (en) | 2019-02-28 | 2019-02-28 | A kind of dual chip passive wireless acoustic surface wave temperature transducer and its temp measuring method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112964384A (en) * | 2021-03-16 | 2021-06-15 | 山东深思智能科技有限公司 | Resonator type wireless passive temperature sensor and working method |
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| CN102928111A (en) * | 2012-11-17 | 2013-02-13 | 中科微声（天津）传感技术有限公司 | Surface acoustic wave temperature sensor |
| CN104406613A (en) * | 2014-12-09 | 2015-03-11 | 常州智梭传感科技有限公司 | Acoustic surface wave sensor with high frequency resource utilization rate and identification method of acoustic surface wave sensor |
| EP2933619A1 (en) * | 2014-04-18 | 2015-10-21 | Centre National De La Recherche Scientifique (Cnrs) | A differential temperature measuring device comprising surface transverse wave resonators |
| CN106225948A (en) * | 2016-07-27 | 2016-12-14 | 电子科技大学 | A kind of double SAW Temperature Sensors and method for designing thereof |
| CN108151907A (en) * | 2017-12-25 | 2018-06-12 | 电子科技大学 | The linear temperature frequency characteristic measuring method of LGS SAW Temperature Sensors |
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2019
- 2019-02-28 CN CN201910153500.1A patent/CN109682493A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102928111A (en) * | 2012-11-17 | 2013-02-13 | 中科微声（天津）传感技术有限公司 | Surface acoustic wave temperature sensor |
| EP2933619A1 (en) * | 2014-04-18 | 2015-10-21 | Centre National De La Recherche Scientifique (Cnrs) | A differential temperature measuring device comprising surface transverse wave resonators |
| CN104406613A (en) * | 2014-12-09 | 2015-03-11 | 常州智梭传感科技有限公司 | Acoustic surface wave sensor with high frequency resource utilization rate and identification method of acoustic surface wave sensor |
| CN106225948A (en) * | 2016-07-27 | 2016-12-14 | 电子科技大学 | A kind of double SAW Temperature Sensors and method for designing thereof |
| CN108151907A (en) * | 2017-12-25 | 2018-06-12 | 电子科技大学 | The linear temperature frequency characteristic measuring method of LGS SAW Temperature Sensors |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112964384A (en) * | 2021-03-16 | 2021-06-15 | 山东深思智能科技有限公司 | Resonator type wireless passive temperature sensor and working method |
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