CN205941869U - Measurement device for coil sensor resonance parameter - Google Patents
Measurement device for coil sensor resonance parameter Download PDFInfo
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- CN205941869U CN205941869U CN201620826246.9U CN201620826246U CN205941869U CN 205941869 U CN205941869 U CN 205941869U CN 201620826246 U CN201620826246 U CN 201620826246U CN 205941869 U CN205941869 U CN 205941869U
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Abstract
The utility model provides a measurement device for coil sensor resonance parameter, according to the transmission direction of signal include the core component, DDS, the amplitude amplifier circuit that constitute by singlechip and CPLD in proper order, treat detecting coil connection structure, resistor array, signal conditioning circuit, ADC and the core component, through core unit control DDS produces tunable frequency's signal to enlarge into the constant voltage signal with its amplitude, will constant voltage signal input gathers the voltage signal at series resistance both ends to by in treating current circuit that detecting coil and resistor array constitute through ADC to thereby calculating data through CPLD and obtaining the stabilizing the voltage value, be worth to the minimum voltage value through the stabilizing the voltage who compares under the different signal frequency at last, its signal frequency who corresponds is the resonant frequency for treating the detecting coil promptly. The device simple structure and intelligent degree are high, and be with low costs, through promoting the frequency change precision and reducing and disturb, has improved measurement accuracy.
Description
Technical field
This utility model is related to coil pickoff field of measuring technique, in particular it relates to a kind of coil pickoff resonance ginseng
The measurement apparatus of number.
Background technology
Coil pickoff is usually used in transient electromagnetic method and some near surface frequency domain electromagnetic methods instruments, plays front end sensing
Device and the effect of sender unit, and the resonant parameter of coil itself can directly influence the tranmitting frequency of signal and to posting
Raw electric capacity, the measurement of stray inductance are with calculating it is therefore desirable to carry out accurate measurement to the resonant parameter of coil.
The measuring method adopting at present is that test coil to be checked is together in series with an outer meeting resistance R and signal source, is protecting
Hold signal source output signal amplitude constant in the case of constantly change the frequency of output signal, utilize oscilloscope measurement definite value simultaneously
The real-time voltage value at resistance two ends, test coil to be checked is equivalent to one by unknown resistance r, unknown capacitance C and unknown inductance L group
The circuit (referring to Fig. 1) becoming, when measuring voltage for minima, whole series circuit is in resonant condition, now, outer meeting resistance
The magnitude of voltage V at two endsRVoltage modulus value V with signal source outputiRatio minimum, that is,：
Determine the now corresponding output frequency of signal source, this frequency is the resonant frequency of test coil to be checked.
Although can measure the resonant frequency of coil using said apparatus, it still suffers from following shortcoming：1st, each
Multiple manual test will be carried out to circuit, to pick out resistance sizeable outer meeting resistance R, complex operation before measurement；
2nd, the frequency of signal source (generally function signal generator, XFG1) output signal can not be accurately consistent with amplitude, that is, work as signal
Frequency when becoming big its amplitude will diminish it is impossible to ensure constant prerequisite of in whole measurement process output signal constant amplitude
Condition, thus causing larger interference to the correctness of measurement result, unless adopted some high-side signal sources, but can lead to cost
Raising；3rd, using the method for artificial setting and reading frequency, accuracy of reading is not high for signal source；4th, utilize the electricity of oscilloscope measurement
Pressure value is that have certain limit limit it is impossible to be suitable for the measurement to all coils resonant frequency completely, and macrooscillograph
Resolution only have 8bit, error in reading is big, affects the reliability of result finally giving.
Utility model content
The purpose of this utility model is to provide a kind of device of the resonant parameter for measuring coil sensor, to solve
The problem proposing in background technology.
For achieving the above object, this utility model provides a kind of measurement apparatus of coil pickoff resonant parameter, according to
Core component that the transmission direction of signal includes being made up of single-chip microcomputer and CPLD successively, DDS, amplitude amplifying circuit, survey line to be checked
Enclose attachment structure, electric resistance array, signal conditioning circuit, ADC and described core component, and described measurement apparatus also include and institute
State the LCD of core component connection；
Described DDS is used for producing the signal of frequency-adjustable, and described amplitude amplifying circuit is used for amplifying the amplitude of input signal
And regulated output voltage is the constant voltage signal of U1, U1 is a fixed value between 0.5V～20V, and described test coil to be checked connects
Structure is used for connecting test coil to be checked, and described electric resistance array includes the fixed value resistance that multiple resistances differ in size, and each definite value electricity
Between resistance, switching is realized by relay, described ADC is used for gathering the voltage signal at fixed value resistance two ends, and described LCD is used for showing
Real-time frequency and its corresponding magnitude of voltage, described single-chip microcomputer has information read functions, can be used for control relay break-make and
The display of LCD, the absolute value that described CPLD is used for completing the control to DDS, the collection of adc data and data is added.
Described single-chip microcomputer is a kind of miniature online real-time control computer, and it is by central processor CPU, random storage
Device RAM, read only memory ROM, multiple I/O mouth and the function such as interruption system, timer/counter (may also include display to drive
The circuit such as galvanic electricity road, pulse-width modulation circuit, analog multiplexer, A/D converter) it is integrated in one, and hold successively in order
The program that row has write.The single-chip microcomputer being designed with respect to function, described CPLD (Complex Programmable
Logic Device, CPLD) be a kind of can voluntarily constitutive logic function digital integrated electronic circuit, Yong Huke
It is programmed according to their needs thus realizing the processing function wanted.
The core component being made up of single-chip microcomputer and CPLD can monitor the process of whole measurement process and complete to institute's total
According to process.
Can produce frequency can for described DDS (Direct Digital Synthesizer, Direct Digital Synthesizer)
The signal adjusted, and it is compared with traditional frequency synthesizer, has low cost, low-power consumption, high-resolution, High variation progress and fast
The advantages of fast conversion time.
Described ADC (Analog to Digital Converter, analog-digital converter) is one and is used for analogue signal is entered
The electronic component that digitized is processed, the voltage signal of input can be converted to the digital signal of output by it, and finally numeral
Signal is transported to data processing and sets in device.
Change due to inputting the voltage signal of ADC is fairly small, it must be entered therefore before being converted to digital signal
Row conditioning, the process such as be amplified, buffer or calibrate so as to fit in the input of ADC to voltage signal.
Preferably, described coil connecting structure to be detected is electrically connected with amplitude amplifying circuit and electric resistance array respectively for two
Conductive clamp, and described two conductive clamp is connected with two leading-out ends of test coil to be checked respectively.
Preferably, described electric resistance array includes six fixed value resistances, and the resistance of each fixed value resistance is respectively 100 Ω, 1K
Ω, 10K Ω, 50K Ω, 200K Ω and 500K Ω.
Preferably, described ADC is high-precision adc, and it has the resolution of 16bit and the sample rate of 100MSPS.
According to the measurement apparatus of above-mentioned coil pickoff resonant parameter, its measuring method is：First pass through by single-chip microcomputer and
CPLD composition core component come to control DDS produce frequency-adjustable signal, and by its amplitude zoom into voltage be U1 constant voltage
Signal, U1 is a fixed value between 0.5V～20V, then described constant voltage signal is input to by test coil to be checked and resistance
In the series circuit of array composition, described electric resistance array includes multiple fixed value resistances that resistance differs in size, and test coil to be checked
Only connect with a fixed value resistance, by the voltage signal at described fixed value resistance two ends through signal conditioning circuit within the same time
It is linked in ADC and carries out data acquisition, more than 20 times absolute is carried out by CPLD to the voltage data under same signal frequency
Value phase adduction averaged, thus obtaining stable voltage corresponding with this signal frequency, finally by comparison unlike signal
Each stable voltage under frequency and obtain minimum amount of voltage that, the corresponding signal frequency of described minimum amount of voltage that is as to be detected
The resonant frequency of coil.
The comprising the following steps that of described measuring method：
1) test coil to be checked is accessed circuit, and make the maximum fixed value resistance of resistance and test coil string to be checked in electric resistance array
Connection, switches on power；
2) DDS is controlled to produce the output signal for f1 for the initial frequency by the core component that single-chip microcomputer and CPLD form, f1 is
A fixed value between 1Hz～100Hz, if the magnitude of voltage at described fixed value resistance two ends is higher than U2, U2=a U1, and coefficient
A is a fixed value between 0.2～0.7, then by relay switch the next less fixed value resistance of resistance with to be detected
Coil is connected, and when being less than U2 until accessing the magnitude of voltage at fixed value resistance two ends of circuit, the resistance of selected fixed value resistance is just
Properly, if until being switched to the fixed value resistance of minimum resistance, the magnitude of voltage at its two ends is still above U2, then directly from minimum
The fixed value resistance of resistance accesses circuit；
3) start to measure, described core component controls DDS constantly to increase the frequency values of its output signal with step frequency f2,
Described step frequency f2 is a fixed value of below 2Hz, and preferably f2 is the value in 0.4Hz～1.5Hz, and more preferably f2 is
Value in 0.5Hz～1.0Hz；
4) while increasing the frequency values of output signal, by the voltage signal at fixed value resistance two ends by signal condition electricity
Road is linked in ADC and carries out data acquisition, by CPLD, the voltage data under same signal frequency is carried out with more than 20 times exhausted
To value phase adduction averaged, thus obtaining stable voltage corresponding with this signal frequency, with the increase of signal frequency,
Stable voltage under the unlike signal obtaining frequency is recorded；
5) when n-th magnitude of voltage is detected, n is the natural number more than or equal to six, by this magnitude of voltage with record before
N-1 magnitude of voltage is compared, if numerical value is diminishing always, a magnitude of voltage of earliest record is lost, and will newly examine
The magnitude of voltage measuring is recorded, and constantly repeats said process, and the magnitude of voltage recording often increases by one and then accordingly loses earliest
One, with the magnitude of voltage sum that guarantees to record for n-1；
6) when the magnitude of voltage newly detecting is bigger than the magnitude of voltage of upper one record, equally by an electricity of earliest record
Pressure value is lost, and the magnitude of voltage newly detecting is recorded, and continuous detecting n-3 magnitude of voltage again, if numerical values recited becomes
It is indefinite to change, then proceed to detect, if numerical value still increases successively, can be determined that now record first magnitude of voltage is
Minimum amount of voltage that, the signal frequency corresponding to this magnitude of voltage is the resonant frequency of test coil to be checked.
The technical scheme that this utility model provides has the advantages that：
1st, the intelligence degree of described measurement apparatus high it is not necessary to artificially screen the outer meeting resistance of suitable resistance every time,
Do not need to arrange frequency manually.
What the 2nd, described measurement apparatus used is conventional equipment, has the advantages that small volume, modularity, low cost.
3rd, the stepping accuracy of DDS output signal frequency is very high, accurately more a lot of than the artificial signal source arranging and reading,
ADC has the resolution of more than 16bit, superior more than the oscillograph of 8bit, can guarantee electricity all the time by amplitude amplifying circuit
The accuracy stablized constant, exclusive PCR, improve measurement result of signal amplitude in road.
4th, the resonant frequency that described measurement apparatus are detected, up to 50MHz, can fully meet the survey of group geophysical instrument
Amount requires.
Brief description
In order to be illustrated more clearly that the technical scheme in this utility model embodiment, below will be to required in embodiment description
Accompanying drawing to be used be briefly described it should be apparent that, drawings discussed below be only of the present utility model some enforcement
Example, for those of ordinary skill in the art, on the premise of not paying creative work, can also obtain according to these accompanying drawings
Obtain other accompanying drawings, wherein：
Fig. 1 is that (dotted line is the test coil to be checked of actual access, is and it for the connection diagram of existing measurement apparatus in coil
Equivalent circuit structure)；
Fig. 2 is the connection diagram of this utility model preferred embodiment；
Fig. 3 is the structural representation of electric resistance array in embodiment illustrated in fig. 2.
Specific embodiment
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is carried out
Clearly and completely description is it is clear that described embodiment is only a part of embodiment of the present utility model rather than whole
Embodiment.Based on the embodiment in this utility model, those of ordinary skill in the art are not under the premise of making creative work
The all other embodiment being obtained, broadly falls into the scope of this utility model protection.
Referring to Fig. 2, a kind of measurement apparatus of coil pickoff resonant parameter, the transmission direction according to signal include successively by
The core component of single-chip microcomputer and CPLD composition, DDS, amplitude amplifying circuit, coil connecting structure to be detected, electric resistance array, signal
Modulate circuit, ADC and described core component, and described measurement apparatus also include the LCD that is connected with described core component, are used for
Show each magnitude of voltage and its corresponding signal frequency detecting and recording.
With continued reference to Fig. 3, described electric resistance array includes six fixed value resistances, and the resistance of each fixed value resistance is respectively 100
Ω, 1K Ω, 10K Ω, 50K Ω, 200K Ω and 500K Ω.
In the present embodiment, described coil connecting structure to be detected is electric with amplitude amplifying circuit and electric resistance array respectively for two
The conductive clamp connecting, and described two conductive clamp is connected with two leading-out ends of test coil to be checked respectively.
In the present embodiment, described ADC is high-precision adc, and it has the resolution of 16bit and the sample rate of 100MSPS.
Using above-mentioned measurement apparatus, the resonant parameter of coil pickoff is measured, it comprises the following steps that：
1) test coil to be checked is accessed circuit, and make resistance in electric resistance array be the fixed value resistance of 500K Ω and survey line to be checked
Circle series connection, switches on power；
2) DDS is controlled to produce the output signal for 1Hz for the initial frequency by the core component that single-chip microcomputer and CPLD form, and will
Its amplitude zooms into the constant voltage signal that voltage is 1V, if the magnitude of voltage at described fixed value resistance two ends is higher than 1/3V, by continuing
The next less fixed value resistance of resistance of electrical equipment switching is connected with test coil to be checked, until the fixed value resistance two ends of access circuit
When magnitude of voltage is less than 1/3V, the resistance of selected fixed value resistance is just right, if until being switched to the definite value electricity of minimum resistance
Resistance, the magnitude of voltage at its two ends is still above 1/3V, then directly the fixed value resistance from minimum resistance accesses circuit；
3) start to measure, described core component controls DDS constantly to increase the frequency of its output signal with the step frequency of 0.5Hz
Rate value；
4) while increasing the frequency values of output signal, by the voltage signal at fixed value resistance two ends by signal condition electricity
Road is linked in ADC and carries out data acquisition, by CPLD, the voltage data under same signal frequency is carried out with 1000 times absolute
Value phase adduction averaged, thus obtaining stable voltage corresponding with this signal frequency, with the increase of signal frequency, will
Stable voltage under the unlike signal frequency obtaining is recorded；
5) when the 6th magnitude of voltage is detected, this magnitude of voltage is compared with 5 magnitudes of voltage recording before, if
Numerical value is diminishing always, then lose a magnitude of voltage of earliest record, and the magnitude of voltage newly detecting is recorded, constantly
Repeat said process, and the magnitude of voltage recording often increases by one and then accordingly loses earliest one, to guarantee the voltage recorded
Value sum is 5；
6) when the magnitude of voltage newly detecting is bigger than the magnitude of voltage of upper one record, equally by an electricity of earliest record
Pressure value is lost, and the magnitude of voltage newly detecting is recorded, and 3 magnitudes of voltage of continuous detecting again, if numerical values recited change
Indefinite, then proceed to detect, if numerical value still increases successively, can be determined that first magnitude of voltage now recording is
Small voltage value, the signal frequency corresponding to this magnitude of voltage is the resonant frequency of test coil to be checked.
The foregoing is only preferred embodiment of the present utility model, not thereby limit patent protection model of the present utility model
Enclose, for a person skilled in the art, this utility model can have various modifications and variations.In spirit of the present utility model
Within principle, any improvement or equivalent that every utilization this utility model description and accompanying drawing content are made, directly or
Indirectly it is used in the technical field of other correlations, all should include in scope of patent protection of the present utility model.
Claims (4)
1. a kind of measurement apparatus of coil pickoff resonant parameter are it is characterised in that include successively according to the transmission direction of signal
The core component that is made up of single-chip microcomputer and CPLD, DDS, amplitude amplifying circuit, coil connecting structure to be detected, electric resistance array, letter
Number modulate circuit, ADC and described core component, and described measurement apparatus also include the LCD that is connected with described core component；
Described DDS is used for producing the signal of frequency-adjustable, and the amplitude that described amplitude amplifying circuit is used for amplifying input signal is simultaneously steady
Determine the constant voltage signal that output voltage is U1, U1 is a fixed value between 0.5V～20V, described coil connecting structure to be detected
For connecting test coil to be checked, described electric resistance array includes the fixed value resistance that multiple resistances differ in size, and between each fixed value resistance
Switching is realized by relay, described ADC is used for gathering the voltage signal at fixed value resistance two ends, described LCD is used for showing in real time
Frequency and its corresponding magnitude of voltage, described single-chip microcomputer has information read functions, can be used for the break-make of control relay and LCD
Display, the absolute value that described CPLD is used for completing the control to DDS, the collection of adc data and data is added.
2. measurement apparatus according to claim 1 are it is characterised in that described coil connecting structure to be detected is two difference
The conductive clamp electrically connecting with amplitude amplifying circuit and electric resistance array, and described two conductive clamp two with test coil to be checked respectively
Leading-out end connects.
3. measurement apparatus according to claim 2 are it is characterised in that described electric resistance array includes six fixed value resistances, and
The resistance of each fixed value resistance is respectively 100 Ω, 1K Ω, 10K Ω, 50K Ω, 200K Ω and 500K Ω.
4. it is characterised in that described ADC is high-precision adc, it has 16bit's to measurement apparatus according to claim 3
Resolution and the sample rate of 100MSPS.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620826246.9U CN205941869U (en) | 2016-08-01 | 2016-08-01 | Measurement device for coil sensor resonance parameter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620826246.9U CN205941869U (en) | 2016-08-01 | 2016-08-01 | Measurement device for coil sensor resonance parameter |
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| CN205941869U true CN205941869U (en) | 2017-02-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106019200A (en) * | 2016-08-01 | 2016-10-12 | 中南大学 | Coil sensor resonance parameter measurement method and device |
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2016
- 2016-08-01 CN CN201620826246.9U patent/CN205941869U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106019200A (en) * | 2016-08-01 | 2016-10-12 | 中南大学 | Coil sensor resonance parameter measurement method and device |
| CN106019200B (en) * | 2016-08-01 | 2018-07-10 | 中南大学 | A kind of measuring method and device of coil pickoff resonant parameter |
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Legal Events
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20170208 Effective date of abandoning: 20180710 |
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| AV01 | Patent right actively abandoned |