CN108692744A - A kind of decoupled sensor measuring device and method - Google Patents
A kind of decoupled sensor measuring device and method Download PDFInfo
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- CN108692744A CN108692744A CN201810267235.5A CN201810267235A CN108692744A CN 108692744 A CN108692744 A CN 108692744A CN 201810267235 A CN201810267235 A CN 201810267235A CN 108692744 A CN108692744 A CN 108692744A
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- power supply
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- sensor
- transmitting coil
- receiving coil
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/16—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying resistance
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The present invention relates to technical field of sensor measurement, and in particular to a kind of decoupled sensor measuring device, including feeder ear and measurement end, feeder ear includes measuring power supply module, measurement end includes sensor assembly, and sensor assembly is installed on environment to be measured, measures power supply module and accesses power supply;Sensor assembly includes receiving coil, equivalent capacity and sensor, and it is in parallel with receiving coil again that equivalent capacity connects sensor;It includes transmitting coil, measuring circuit and power supply circuit to measure power supply module, and transmitting coil is separately connected power supply circuit and measuring circuit;Transmitting coil transmits energy with receiving coil mutual inductance.The device may be implemented measurement end and be detached with feeder ear, measuring device of the sensor measurement end without power supply.It is simple in structure to solve the problems, such as sensor measurement power supply, it is easy to use, it is hardly damaged.
Description
Technical field
The invention belongs to technical field of sensor measurement more particularly to a kind of decoupled sensor measuring devices and method.
Background technology
Sensor is increasingly automated system or even the essential key components of modern sophisticated technology, is to obtain
It is derived from the main path and means of information in right field, is the central nervous system of modern science.Sensor is in research object
With the interface position of TT&C system, it is easy that all scientific researches and the production process information to be obtained will be converted to by it
The electric signal of transmission and processing.But the problem that current sensor measurement techniques have power supply difficult, internal battery powers need
It inspects periodically, maintenance requirement is higher etc.;Wireless power still in developing stage, can not fully meet specific demand at present.
Invention content
An object of the present invention is to provide one kind measurement end may be implemented to be detached with feeder ear, and sensor measurement end is not necessarily to
The measuring device of power supply.It is simple in structure to solve the problems, such as sensor measurement power supply, it is easy to use, it is hardly damaged.
Second object of the present invention is to provide a kind of method measured using decoupled sensor measuring device.
To achieve the above object, the technical solution adopted by the present invention is:A kind of decoupled sensor measuring device, including supply
Electric end and measurement end, feeder ear include measuring power supply module, and measurement end includes sensor assembly, and sensor assembly is installed on to be measured
Environment measures power supply module and accesses power supply;Sensor assembly includes receiving coil, equivalent capacity and sensor, and equivalent capacity connects
Sensor is connect to connect with receiving coil again;It includes transmitting coil, measuring circuit and power supply circuit, transmitting coil to measure power supply module
It is separately connected power supply circuit and measuring circuit;Transmitting coil transmits energy with receiving coil by mutual inductance.
In above-mentioned decoupled sensor measuring device, transmitting coil, receiving coil are all made of spiral shape or vortex-like knot
Structure;Sensor includes gas sensing resistance, humistor, varistor, photo resistance or thermistor;Measuring circuit includes sampling core
Piece and processing chip;Power supply circuit includes rectification circuit and translation circuit.
In above-mentioned decoupled sensor measuring device, translation circuit includes switching device and control chip;Rectified current
Road includes signal source and power amplifier.
A kind of measurement method of decoupled sensor measuring device, includes the following steps:
Transmitting coil access power supply circuit is primary side, receiving coil and biography by step 1, the switch for being closed power supply module
Sensor series connection is secondary side;
Step 2 is acted on by transmitting coil and receiving coil mutual inductance, and energy is transmitted by primary lateral secondary side;And when
Between in t whole system reach stable state;
Step 3, later disconnects the switch of power supply module, and power supply module is disconnected with transmitting coil, accesses measuring circuit;
The energy that step 4, secondary side store vibrates between capacitance and inductance, and secondary side circuit is equivalent to order Oscillating
Circuit;
Step 5, by theory analysis it is found that under certain constraints, order Oscillating circuit shows as order Oscillating and owes
Damping vibration attenuation process, the frequency of current or voltage waveform or period are fixed, and only with the equivalent inductance of secondary side circuit, etc.
It is related to resistance to imitate inductance;
Energy is fed back to transmitting coil by step 6, receiving coil by mutual inductance, makes transmitting coil both ends current or voltage wave
The frequency or period feature having the same of the current or voltage waveform of the frequency of shape or period and receiving coil;
Step 7, the current or voltage waveform that transmitting coil both ends are obtained by the sampling A/D chip of measuring circuit, and at
Reason chip obtains frequency or the period of its current or voltage waveform;
Step 8 acquires the electricity of sensor by theoretical formula known to secondary side equivalent inductance and capacitance
Resistance value;And by comparing the correspondence between sensor resistance and measured physical quantity, to obtain measured physical quantity.
The beneficial effects of the invention are as follows:The measurement module of its measurement of mutual inductance structure is realized with power supply module to be detached, sensing
Device end is not necessarily to power supply, does not need frequent maintenance.It is simple in structure to solve the problems, such as sensor measurement power supply, it is easy to use,
It is hardly damaged.And more extreme environments are applicable in, the scope of application is wider.
Description of the drawings
Fig. 1 is the structural schematic diagram of one embodiment of the invention decoupled sensor measuring device;
Fig. 2 is one embodiment of the invention decoupled sensor measuring device measuring method flow chart;
Fig. 3 is one embodiment of the invention transmitting coil and receiving coil helical structure schematic diagram;
Fig. 4 is one embodiment of the invention transmitting coil and the vortex-like structural schematic diagram of receiving coil;
Fig. 5 is that one embodiment of the invention measures power supply module structural schematic diagram;
Fig. 6 is one embodiment of the invention sensor module structure schematic diagram;
Fig. 7 is that one embodiment of the invention measures power supply module and sensor assembly equivalent circuit diagram;
Fig. 8 is one embodiment of the invention switch K1For closed state, powers and reach for secondary side by mutual inductance feeder ear
To the equivalent circuit diagram of stable state;
Fig. 9 is one embodiment of the invention switch K1Off-state, secondary side RLC second order equivalent circuit diagrams;
Figure 10 is one embodiment of the invention secondary side circuit simplified electrical circuit diagram;
Figure 11 is one embodiment of the invention circuit oscillation discharge waveform schematic diagram.
Specific implementation mode
Embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.
What the present embodiment was realized in:As shown in Figure 1, a kind of decoupled sensor measuring device, which includes supplying
Electric end and measurement end two parts.Feeder ear is detached with measurement end two parts, measurement end need to only install respective sensor without
Need power supply facilities.When measurement, energy is transmitted by transmitting coil and receiving coil mutual inductance by feeder ear, then by measurement end pair
Port voltage sampling analysis is found out to be measured.Measurement end includes sensor assembly, and feeder ear includes measuring power supply module, sensing
Device module is detached with power supply module is measured, and electric power repair problem is not present, and suitable environment also greatly increases.Measure power supply mould
Block is powered by mutual inductance for measurement end, and analysis circuit characteristic realizes the measurement of measured physical quantity.
Moreover, sensor assembly includes receiving coil, equivalent capacity and sensor;Receiving coil structure is spiral shape or whirlpool
Shape structure;Sensor includes gas sensing resistance, humistor, varistor, photo resistance or thermistor;Measure power supply module packet
Include transmitting coil, measuring circuit and power supply circuit;Measuring circuit includes sampling A/D chip and processing chip;Translation circuit includes switch
Device and control chip;Power supply circuit includes rectification circuit and translation circuit;Transmitting coil structure is spiral shape or vortex-like structure.
When it is implemented, transmitting coil accesses measuring circuit, power supply circuit generates the sinusoidal ac of specific frequency, transmitting
Between coil and receiving coil due to mutual inductance act on, energy transmission is carried out between transmitting coil and receiving coil, the system when
Between reach stable state in t.Translation circuit acts, and power supply circuit disconnects, and at this time because secondary side still stores energy, shows as second order
Magnetic field energy is fed back to transmitting coil by oscillating circuit, receiving coil, and transmitting coil ab both end voltages are also waveform.The ends ab
For measuring circuit according to feedback waveform display electric voltage frequency or period, this frequency or period are related to the resistance value of electric resistance sensor, because
This can be found out to be measured by the correspondence of electric resistance sensor resistance value and environment between to be measured.Measurement end first when use
Receiving coil is mounted on respective sensor in environment to be measured, and when checking errorless measure, transmitting coil accesses power supply circuit,
It is that energy is transmitted in end to be measured by mutual inductance by feeder ear.After the system stabilizes, power supply circuit is disconnected, at this time measurement end sampling A/D chip pair
Port voltage samples, and processing chip can acquire to be measured according to gained frequency.
As shown in Fig. 2, a kind of measurement method of decoupled sensor measuring device, is closed the switch of power supply module first,
It is primary side that transmitting coil, which accesses power supply circuit, and receiving coil is secondary side with sensor series, due to transmitting coil and is received
Mutual inductance effect between coil, energy are transmitted by primary lateral secondary side.Whole system reaches stable state in certain time t.It connects
Disconnection switch, power supply module is disconnected with transmitting coil, and accesses measuring circuit.Secondary side still stores energy at this time,
It is vibrated between capacitance and inductance, secondary side circuit can be equivalent to order Oscillating circuit.Theory analysis is it is found that in certain constraint
Under the conditions of, this second-order circuit shows as underdamping attenuation process, and the circuital current or voltage waveform frequency or period are fixed, and only
It is only related to the equivalent inductance of secondary side circuit, equivalent inductance and resistance.Receiving coil can be fed back to energy by mutual inductance
Transmitting coil, and transmitting coil both ends current or voltage feature having the same.It is obtained by the sampling A/D chip of measuring circuit
The current or voltage waveform at transmitting coil both ends, and obtain its frequency or period further across processing chip.By theoretical public
Formula can include gas sensing resistance, humistor, pressure in the hope of sensor known to secondary side equivalent inductance and capacitance
The resistance value of quick resistance, photo resistance or thermistor.And by comparing the corresponding pass between the resistance value and measured physical quantity
System, finally obtains physical quantity to be asked.
As shown in figure 3, transmitting coil and receiving coil are spiral structure coil, conducting wire according to equal radiuses, equidistantly
Requirement spiral rise coiling.Can the coiling that intermediate can also in advance interspace of close coiling, two kinds of winding method characteristics have difference
Not, also there is difference in applicable place.The design parameter of spiral structure coil used in the present embodiment is:Conductor material enamel-cover
Line, wire radius 0.9mm, wire spacing 2mm, coil outer radius 100mm, the number of turns 20.
As shown in figure 4, transmitting coil and receiving coil are vortex-like structure.Vortex-like structure coil be conducting wire in a plane
According to certain orientation, direction pivots clockwise or counter-clockwise is pressed along circular configuration, is kept the same spacing between conducting wire, the multiturn of coiling
Loop construction.There is also two kinds of situations of the coiling of reserved certain interval and close coiling.Vortex-like structure lines used in the present embodiment
The design parameter of circle is:Wire radius 0.9mm, wire spacing 2mm, coil inside radius 100mm, the number of turns 20.
In order to improve efficiency, the mode confining magnetic field of addition core structure may be used and guide the transmission direction in magnetic field,
So that magnetic direction is directed toward the direction of energy transmission as far as possible, increase the accounting of effectively transmission energy magnetic field.
As shown in Figure 5:Power supply circuit connect with measuring circuit with the same port, i.e., on transmitting coil, power supply circuit by
Power supply and rectification transformating circuit and control circuit composition, and measuring circuit is made of sampling A/D chip and processing chip.It measures
When, control switch says that transmitting coil accesses power supply circuit first, and after the system stabilizes, control switch disconnects the company of power supply circuit
It connects.Then port voltage is acquired by sampling A/D chip in measuring circuit, by processing chip analysis voltage frequency to find out final result,
That is measured physical quantity.
As shown in Figure 6:Sensor assembly includes sensor, matching capacitance and receiving coil.Sensor includes air-sensitive electricity
Resistance, humistor, varistor, photo resistance or thermistor (temperature) sensor choose suitable resistance biography according to environment is to be measured
Sensor determines resistance variation range by the correspondence of resistance and environment between to be measured, with this come determine receiving coil electricity
The numerical value of sense and matching capacitance.
The present embodiment sensor selects NTC type thermistors, temperature characterisitic table as follows.
Thus ranging from 0-100 DEG C of variation of ambient temperature corresponds to thermistor change in resistance range in 0.9K Ω -28K Ω
Between, meet resistance maximum valueThis condition, it is first determined the receiving coil of inductance, the present embodiment is spiral shape
Structure, inductance value L2For 10mH, and thus choose matching capacitance C2For 10pF.
By inductance L2=10mH, capacitance C2=10pF brings into order Oscillating equation and obtains,
Two characteristic roots of above-mentioned second order differential equation are p1,p2, to simplify operation, enable
Characteristic root is acquired with this
Transmitting coil both end voltageAnd order Oscillating circuital currentTherefore it sends out
Ray circle port voltage uabWith electric current i2Period having the same or frequency.The ports ab measuring circuit includes sampling A/D chip and processing
Chip.By sampling A/D chip acquisition port voltage u in measuring circuitab, voltage cycle or frequency are acquired to find out most by processing chip
Result afterwards.
Under 0 DEG C of environment of temperature, end receiving coil to be measured is connect completion with thermistor (temperature) sensor first, is checked errorless
When measuring, transmitting coil accesses power supply circuit, is that energy is transmitted in end to be measured by mutual inductance by feeder ear.Wait for that system is stablized
Afterwards, power supply circuit is disconnected, the sampling A/D chip of measuring circuit can be according to sampled result to port voltage sample, processing chip at this time
Calculate voltage cycle or frequency, gained cycle T=2.20 × 10 under 0 DEG C of environment-6s。
According to the numerical value of gained cycle T and bring formula intoIn, calculating can obtain temperature-sensitive electricity
Resistance value R=27.5680K Ω are hindered, standard temperature-sensitive resistance 28.0170K errors corresponding in table 0 DEG C are 1.6%.
Under 25 DEG C of environment of temperature, above-mentioned measurement operation is repeated, the voltage cycle T under 25 DEG C of environment is read from ab measurement ends
=2.01 × 10-6, bring intoIn, thermistor resistance value R=10000 is calculated, with 25 DEG C in table
Under corresponding standard temperature-sensitive resistance 10K error be 4.4%.
Its measuring principle is as follows:It measures power supply module and sensor assembly equivalent circuit is as shown in Figure 7.
It measures in power supply module, AC is equivalent AC power supply, RsFor equivalent source internal resistance, K1For conversion module equivalent switch,
C1For feeder ear equivalent capacity, RL1For transmitting coil equivalent resistance, L1For transmitting coil equivalent inductance, a and b connect for sampling A/D chip
Mouthful, it is used for waveform sampling.In measurement module, C2For measurement end equivalent capacity, L2For receiving coil equivalent inductance, RL2To receive
Coil equivalent resistance, RLFor sensor equivalent resistance.
In 0 < t < t1 times, switch K1It is that secondary side powers and reaches stable state by mutual inductance feeder ear for closed state,
Equivalent circuit is as shown in Figure 8.
Circuit steady-state equation is as follows:
T=t1Moment, switch K1It disconnects, transmitting coil no current flows through at this time, i.e. i1=0, primary side does not have secondary side
It influences, secondary side is RLC second order equivalent circuits, and equivalent circuit diagram is as shown in Figure 9.
Secondary side equivalent resistance R=RL2+RL, it is as shown in Figure 10 that secondary side circuit is further simplified circuit.
This circuit can be analyzed with second-order circuit model.It is as follows that circuit oscillation swings equation:
Wherein ucFor capacitance both end voltage.
The characteristic equation of above-mentioned second order differential equation is
L2C2p2+RC2P+1=0 (3)
Characteristic root is
General solution is
Wherein A1,A2For integral constant undetermined.
In the case of, i.e.,When, circuit is underdamping attenuation process.In this feelings
Under condition, P1,P2It is a pair of Conjugate complex roots with negative real part, enables
Then
Abbreviation is arranged to obtain
Wherein U0For the initial voltage on capacitance.Further abbreviation
According toLoop current is
Circuit oscillation discharge waveform is the constant decaying wave of period tau.As shown in figure 11.
By formula (14) it is found that in the case where receiving coil equivalent inductance and circuit equivalent capacitance determine, the oscillation of circuit
Frequency is only related with resistance value R, that is to say, that frequency and resistance correspond, therefore can by the frequency of oscillation of counting circuit come
Realize measurement of correlation.
And the determination of circuit oscillation frequency, it can be calculated by the voltage signal at the both ends ab.Since mutual inductance acts on, haveSo ab both end voltages and secondary side current frequency of oscillation having the same.By measuring shaking for ab terminal voltages
Frequency is swung, resistance R can be calculated by formula (8)L。
Ab both end voltage waveforms can be obtained by specific chip, and the time of voltage zero crossing twice is exactly the periodBring formula (8) into
Measured physical quantity can be calculated after acquiring R by corresponding relation.
Due to needing to meetThis condition, as the case may be first determine gas sensing resistance, humistor,
The change in resistance of varistor, photo resistance or thermistor ranging from R1~R2, then determine suitable receiving coil inductance
L2, it may be determined that matching capacitance
It should be understood that the part that this specification does not elaborate belongs to the prior art.
Although describing the specific implementation mode of the present invention above in association with attached drawing, those of ordinary skill in the art should
Understand, these are merely examples, and various deformation or modification can be made to these embodiments, without departing from the original of the present invention
Reason and essence.The scope of the present invention is only limited by the claims that follow.
Claims (4)
1. a kind of decoupled sensor measuring device, including feeder ear and measurement end, feeder ear includes measuring power supply module, is measured
End includes sensor assembly, and sensor assembly is installed on environment to be measured, measures power supply module and accesses power supply;It is characterized in that sensing
Device module includes receiving coil, equivalent capacity and sensor, and equivalent capacity connection sensor is connected with receiving coil again;It measures and supplies
Electric module includes transmitting coil, measuring circuit and power supply circuit, and transmitting coil is separately connected power supply circuit and measuring circuit;Transmitting
Coil transmits energy with receiving coil by mutual inductance.
2. decoupled sensor measuring device as described in claim 1, characterized in that transmitting coil, receiving coil are all made of
Spiral shape or vortex-like structure;Sensor includes gas sensing resistance, humistor, varistor, photo resistance or thermistor;It measures
Circuit includes sampling A/D chip and processing chip;Power supply circuit includes rectification circuit and translation circuit.
3. decoupled sensor measuring device as claimed in claim 2, characterized in that translation circuit includes switching device and control
Coremaking piece;Rectification circuit includes signal source and power amplifier.
4. a kind of measurement method of decoupled sensor measuring device, characterized in that include the following steps:
Transmitting coil access power supply circuit is primary side, receiving coil and sensor by step 1, the switch for being closed power supply module
Series connection is secondary side;
Step 2 is acted on by transmitting coil and receiving coil mutual inductance, and energy is transmitted by primary lateral secondary side;And in time t
Whole system reaches stable state;
Step 3, later disconnects the switch of power supply module, and power supply module is disconnected with transmitting coil, accesses measuring circuit;
The energy that step 4, secondary side store vibrates between capacitance and inductance, and secondary side circuit is equivalent to order Oscillating electricity
Road;
Step 5, by theory analysis it is found that under certain constraints, order Oscillating circuit shows as order Oscillating underdamping
Attenuation process, the frequency of current or voltage waveform or period are fixed, and only with the equivalent inductance of secondary side circuit, equivalent electricity
Sense is related to resistance;
Energy is fed back to transmitting coil by step 6, receiving coil by mutual inductance, makes transmitting coil both ends current or voltage waveform
The frequency or period feature having the same of the current or voltage waveform of frequency or period and receiving coil;
Step 7, the current or voltage waveform that transmitting coil both ends are obtained by the sampling A/D chip of measuring circuit, and by processing core
Piece obtains frequency or the period of its current or voltage waveform;
Step 8 acquires the resistance value of sensor by theoretical formula known to secondary side equivalent inductance and capacitance;
And by comparing the correspondence between sensor resistance and measured physical quantity, to obtain measured physical quantity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810267235.5A CN108692744A (en) | 2018-03-28 | 2018-03-28 | A kind of decoupled sensor measuring device and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810267235.5A CN108692744A (en) | 2018-03-28 | 2018-03-28 | A kind of decoupled sensor measuring device and method |
Publications (1)
| Publication Number | Publication Date |
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| CN108692744A true CN108692744A (en) | 2018-10-23 |
Family
ID=63844384
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| CN201810267235.5A Withdrawn CN108692744A (en) | 2018-03-28 | 2018-03-28 | A kind of decoupled sensor measuring device and method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102539005A (en) * | 2011-12-26 | 2012-07-04 | 浙江大学 | Coupling-based non-contact temperature measurement system and coupling-based non-contact temperature measurement method |
| CN102866430A (en) * | 2012-07-16 | 2013-01-09 | 上海大学 | Wireless communication technology-based geomagnetic measurement system and temperature compensation method thereof |
| CN103219807A (en) * | 2013-04-23 | 2013-07-24 | 重庆交通大学 | Self-adapting wireless electric energy transmission device |
-
2018
- 2018-03-28 CN CN201810267235.5A patent/CN108692744A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102539005A (en) * | 2011-12-26 | 2012-07-04 | 浙江大学 | Coupling-based non-contact temperature measurement system and coupling-based non-contact temperature measurement method |
| CN102866430A (en) * | 2012-07-16 | 2013-01-09 | 上海大学 | Wireless communication technology-based geomagnetic measurement system and temperature compensation method thereof |
| CN103219807A (en) * | 2013-04-23 | 2013-07-24 | 重庆交通大学 | Self-adapting wireless electric energy transmission device |
Non-Patent Citations (1)
| Title |
|---|
| 阎孟昆等: "基于电磁耦合的电缆导体运行温度直接测量方法", 《高电压技术》 * |
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Application publication date: 20181023 |