CN109374967A - A kind of detection method and system towards low reactance-resistance ratio SAW magnetoelectric transducer resonance frequency - Google Patents
A kind of detection method and system towards low reactance-resistance ratio SAW magnetoelectric transducer resonance frequency Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/10—Plotting field distribution ; Measuring field distribution
Abstract
The invention discloses a kind of detection methods and system towards low reactance-resistance ratio SAW magnetoelectric transducer resonance frequency, wherein method includes: to carry out frequency sweep to the low reactance-resistance ratio SAW magnetoelectric transducer by high frequency pumping, it obtains the divided voltage signal of each frequency point and closes voltage signal, to divided voltage signal with close voltage signal and be successively mixed, filter and analog-to-digital conversion process, obtain digital signal；The voltage ratio that each frequency point is calculated using pretreated digital signal, using the corresponding frequency of the maximum frequency point of voltage ratio as the resonance frequency of low reactance-resistance ratio SAW magnetoelectric transducer.The method of the present invention has the advantage that range is wide, stability is good and accuracy is high for the resonance frequency detection of low reactance-resistance ratio SAW magnetoelectric transducer.
Description
Technical field
The invention belongs to surface wave (SAW) magnetoelectric transducer signal detection fields, more particularly, to one kind towards low Q
The detection method and system of value SAW magnetoelectric transducer resonance frequency.
Background technique
SAW magnetoelectric transducer be it is a kind of by magnetostriction materials preparation in piezoelectricity SAW device, changed using resonance frequency
The Magnetic Sensor in magnetic field is measured, it has many advantages, such as small in size, low in energy consumption, high sensitivity.Resonance frequency is SAW magnetoelectric transducer
Important parameter, detect resonance frequency, magnetic field can be acquired indirectly after finding resonance frequency and external magnetic field respective function relationship
Variable quantity.Need to meet the requirement of four aspects for the detection of resonance frequency: frequency detection range is wide, speed is fast, accuracy
Height, stability are good.Detection method mainly has phase-detection method, oscillating circuit detection method, mixing detection method, PLL (locking phase at present
Ring) detection method, DDS (direct digital synthesis technique) Scanning Detction method etc., these methods are for high q-factor, low-loss SAW magnetoelectricity
Sensor has many advantages, such as that accuracy is high, circuit stability is good.However, for the SAW magnetoelectric transducer of low reactance-resistance ratio, high loss,
Phase-detection method is detected using fixed frequency, and frequency detection range is relatively narrow；Oscillating circuit detection method, mixing detection method, PLL
Detection method and DDS Scanning Detction method are both needed to design oscillating circuit, and due to the characteristic of device low reactance-resistance ratio, frequency of oscillation may be unstable
It is fixed, eventually lead to that measurement resonance frequency error is larger, and accuracy is lower.
It can be seen that there are frequency detection ranges for existing detection method for the SAW magnetoelectric transducer of low reactance-resistance ratio, high loss
Problem relatively narrow, stability is poor and accuracy is lower.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, the present invention provides one kind towards low reactance-resistance ratio SAW magnetic-electric sensing
The detection method and system of device resonance frequency, thus solving the prior art, there are frequency detectings for low reactance-resistance ratio SAW magnetoelectric transducer
The technical problem that range is relatively narrow, stability is poor and accuracy is lower.
To achieve the above object, according to one aspect of the present invention, one kind is provided towards low reactance-resistance ratio SAW magnetoelectric transducer
The detection method of resonance frequency, comprising:
(1) frequency sweep is carried out to the low reactance-resistance ratio SAW magnetoelectric transducer by high frequency pumping, obtains the component voltage letter of each frequency point
Number with close voltage signal, divided voltage signal is successively mixed with conjunction voltage signal, is filtered and analog-to-digital conversion process, is counted
Word signal；
(2) voltage ratio that each frequency point is calculated using pretreated digital signal, by the maximum frequency point of voltage ratio
Resonance frequency of the corresponding frequency as low reactance-resistance ratio SAW magnetoelectric transducer.
Further, step (1) includes:
(1-1) generates high-frequency signal using digital form and obtains each frequency point under the incentive action of high-frequency signal
Divided voltage signal and conjunction voltage signal；
(1-2) when local oscillation signal is differed with high-frequency signal as fixed value, using local oscillation signal respectively to divided voltage signal
Down-converted is carried out with voltage signal is closed, obtain the mixed frequency signal of divided voltage signal and closes the mixed frequency signal of voltage signal；
(1-3) filters the low frequency and high-frequency noise in the mixed frequency signal of divided voltage signal and the mixed frequency signal of conjunction voltage signal
Signal obtains intermediate-freuqncy signal, and intermediate-freuqncy signal is converted to digital signal, is then pre-processed to digital signal.
Further, pretreatment includes: zero averaging, FFT and Cordic operation.
Further, step (2) includes:
(2-1) carries out n times measurement to each frequency point, calculates i-th after the measurement result of removal n times measurement midpoint sequence mistake
The voltage ratio average value of measurementAnd standard deviation sigma；
The voltage ratio r that (2-2) is measured when i-thiWith voltage ratio average valueDifference when being greater than k times of standard deviation sigma,
The secondary measurement result is removed, measurement result is otherwise retained；
(2-3) calculates the final voltage ratio average value of current frequency point using the measurement result retained in step (2-2) and makees
For the voltage ratio of current frequency point, and then calculate the voltage ratio of each frequency point；
(2-4) using the corresponding frequency of the maximum frequency point of voltage ratio as the resonance frequency of low reactance-resistance ratio SAW magnetoelectric transducer,
It will be using the corresponding frequency of the smallest frequency point of voltage ratio as the anti-resonance frequency of low reactance-resistance ratio SAW magnetoelectric transducer.
It is another aspect of this invention to provide that providing a kind of detection system towards low reactance-resistance ratio SAW magnetoelectric transducer resonance frequency
System, comprising: scan module, signal processing module and resonance frequency searching module；
The scan module obtains each for carrying out frequency sweep to the low reactance-resistance ratio SAW magnetoelectric transducer by high frequency pumping
The divided voltage signal of frequency point and voltage signal is closed, divided voltage signal is successively mixed with conjunction voltage signal, is filtered and modulus
Conversion process obtains digital signal；
Then the signal processing module carries out digital signal pre- for caching the digital signal of scan module output
Processing, is sent to resonance frequency searching module for pretreated digital signal；
The resonance frequency searching module, for calculating the voltage ratio of each frequency point using pretreated digital signal
Value, using the corresponding frequency of the maximum frequency point of voltage ratio as the resonance frequency of low reactance-resistance ratio SAW magnetoelectric transducer.
Further, scan module includes: high frequency pumping module, local oscillating module, resonator voltage measuring circuit mould
Block, frequency mixing module, bandpass filtering modules block and A/D conversion module,
High-frequency signal is sent to resonance for generating high-frequency signal using digital form by the high frequency pumping module
Device tension measuring circuit module；
The local oscillating module, for when it is fixed value that local oscillation signal, which is differed with high-frequency signal, local oscillation signal to be sent out
It send to the rf inputs of frequency mixing module；
The resonator voltage measuring circuit module, for obtaining each frequency point under the incentive action of high-frequency signal
Divided voltage signal and conjunction voltage signal are successively sent to frequency mixing module by divided voltage signal and conjunction voltage signal sequentially in time
Low frequency input terminal；
The frequency mixing module, for divided voltage signal and being closed at voltage signal progress down coversion respectively based on local oscillation signal
Reason obtains the mixed frequency signal of divided voltage signal and closes the mixed frequency signal of voltage signal；
The bandpass filtering modules block, for filtering in the mixed frequency signal of divided voltage signal and the mixed frequency signal of conjunction voltage signal
Low frequency and HF noise signal, obtain intermediate-freuqncy signal；
The A/D conversion module, for intermediate-freuqncy signal to be converted to digital signal.
Further, signal processing module includes: double scanning frequency-variable modules, acquisition receiving module, digital signal pretreatment
Module and memory interface control module,
Double scanning frequency-variable modules, for controlling excitation signal generator and local oscillations mould in high frequency pumping module
Local oscillation signal generator in block generates the sinusoidal signal that difference within the scope of setpoint frequency is always fixed value；
The acquisition receiving module, for acquiring the digital signal of scan module output；
The digital signal preprocessing module, for being pre-processed using FPGA to digital signal；
The memory interface control module, for the digital signal and number signal pre-processing module to acquisition receiving module
The intermediate data of middle generation is cached.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, can obtain down and show
Beneficial effect:
(1) low reactance-resistance ratio, the height by high frequency pumping is lost in scanning frequency conversion voltage ratio detection method provided by the invention
SAW magnetoelectric transducer carries out frequency sweep, is mixed to obtained divided voltage signal with voltage signal is closed, so that subsequent frequency is believed
Number have wider range, overcome the relatively narrow problem of traditional detection method frequency detection range.Signal after mixing is carried out
Filtering and analog-to-digital conversion process, reduce signal processing complexity.The method for obtaining resonance frequency using voltage ratio, reduces
The relative error between resonance frequency and true resonance frequency is measured, accuracy of measurement is improved.
(2) present invention overcomes low Q in such a way that scan module is to the progress external drive oscillation of SAW magnetoelectric transducer
The frequency signal that value devices use self-oscillation generates may the unstable problem to keep relative error larger.In addition, sweeping
Frequency module medium-high frequency excitation module and the frequency signal of local oscillating module synthesis have wider range, overcome traditional detection
The relatively narrow problem of method frequency detection range.
(3) high frequency analog signals are faded to intermediate frequency by scan module of the invention, become digital medium-frequency signal through analog-to-digital conversion,
Reduce signal processing complexity.Acquisition processing module using FPGA can high-speed parallel operation characteristic digital signal is carried out it is real
When pre-process, alleviate the processing pressure of resonance frequency searching module, improve system integral operation speed.
Detailed description of the invention
Fig. 1 is resonator voltage measuring circuit schematic diagram provided in an embodiment of the present invention；
Fig. 2 is a kind of detection method towards low reactance-resistance ratio SAW magnetoelectric transducer resonance frequency provided in an embodiment of the present invention
Flow chart；
Fig. 3 is the whole knot provided in an embodiment of the present invention towards low reactance-resistance ratio SAW magnetoelectric transducer resonant frequency detection system
Structure schematic diagram；
Fig. 4 is the Hardware Subdivision provided in an embodiment of the present invention towards low reactance-resistance ratio SAW magnetoelectric transducer resonant frequency detection system
Separation structure schematic diagram；
Fig. 5 is the signal processing module structural schematic diagram provided in an embodiment of the present invention based on FPGA；
Fig. 6 is PC host computer work flow diagram provided in an embodiment of the present invention；
Fig. 7 is resonance frequency point lookup method work flow diagram provided in an embodiment of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.
As shown in Figure 1, resonator voltage measuring circuit, R1And R2For two divider resistances, the size relation of holding is R2≤
R1/10；Y1For SAW magnetoelectric transducer；RzFor impedance matching network, impedance value is slightly less than SAW magnetoelectric transducer equivalent resistance
Value.RzBoth end voltage is component voltage, RzWith Y1The voltage at both ends is to close voltage signal.The control point of controllable radio frequency single-pole double-throw switch (SPDT)
Voltage signal V1sinw1T and conjunction voltage signal V2sinw1The output of t.
As shown in Fig. 2, a kind of detection method towards low reactance-resistance ratio SAW magnetoelectric transducer resonance frequency, comprising:
(1) frequency sweep is carried out to the low reactance-resistance ratio SAW magnetoelectric transducer by high frequency pumping, obtains the component voltage letter of each frequency point
Number with close voltage signal, divided voltage signal is successively mixed with conjunction voltage signal, is filtered and analog-to-digital conversion process, is counted
Word signal；
(2) voltage ratio that each frequency point is calculated using pretreated digital signal, by the maximum frequency point of voltage ratio
Resonance frequency of the corresponding frequency as low reactance-resistance ratio SAW magnetoelectric transducer.
As shown in figure 3, a kind of detection system towards low reactance-resistance ratio SAW magnetoelectric transducer resonance frequency, comprising: scan module,
Signal processing module and resonance frequency searching module；
The scan module obtains each for carrying out frequency sweep to the low reactance-resistance ratio SAW magnetoelectric transducer by high frequency pumping
The divided voltage signal of frequency point and voltage signal is closed, divided voltage signal is successively mixed with conjunction voltage signal, is filtered and modulus
Conversion process obtains digital signal；
Then the signal processing module carries out digital signal pre- for caching the digital signal of scan module output
Processing, is sent to resonance frequency searching module for pretreated digital signal；
The resonance frequency searching module, for calculating the voltage ratio of each frequency point using pretreated digital signal
Value, using the corresponding frequency of the maximum frequency point of voltage ratio as the resonance frequency of low reactance-resistance ratio SAW magnetoelectric transducer.
As shown in figure 4, the hardware components structure of resonant frequency detection system, including excitation signal generator, local oscillation signal
Generator, resonator voltage measuring circuit, frequency mixer, bandpass filter, ADC.
The excitation signal generator, for generating frequency range be 35MHz~500MHz, precision 1kHz, sine are believed
Number sinw1T, being then forwarded to resonator voltage measuring circuit makes resonator generate oscillator signal.
The resonator voltage measuring circuit, for generating divided voltage signal V1sinw1T and conjunction voltage signal V2sinw1t
The low frequency input terminal of frequency mixer is respectively sent in different time sections.
The local oscillation signal generator, for generating frequency range be 35MHz~500MHz, precision is that the local of 1kHz shakes
Swing sinusoidal signal sinw2T is sent to the rf inputs of frequency mixer.w2With w1Difference is always 1MHz.
The frequency mixer carries out down coversion to two-way input signal.Component voltage is distinguished after being mixed with conjunction voltage signal
Are as follows:
V1sinw1t×sinw2T=V1/2×[cos(w1-w2)t-cos(w1+w2)t]
V2sinw1t×sinw2T=V2/2×[cos(w1-w2)t-cos(w1+w2)t]
Since frequency mixer carries out down coversion operation, therefore component voltage is respectively as follows: with output signal after voltage is mixed is closed
Vm1=V1/2×cos(w1-w2)t
Vm2=V2/2×cos(w1-w2)t
The filter is that center frequency is 1MHz, and bandwidth is the passive LC band pass filter of 20kHz.
Filtered signal is mainly carried out analog-to-digital conversion by the ADC, exports corresponding digital signal, is carried out convenient for FPGA
Data processing, ADC sample circuit here use channel structure.
The FPGA is mainly to controllably penetrating in excitation signal generator, local oscillation signal generator, resonator measuring circuit
Frequency single-pole double-throw switch (SPDT) is driven, and the digital signal that ADC is sampled pre-processes, and is then sent to PC and is carried out into one
The processing of step.The order of the end PC transmission is received simultaneously, is coordinated internal module and is worked normally.
As shown in figure 5, the signal processing module structure based on FPGA, including double scanning frequency-variable modules, acquisition receiving module,
Digital signal preprocessing module, memory interface control module, data packet handing module, usb communication module.
Double scanning frequency-variable modules, the frequency control word that received data packet processing module issues, control pumping signal hair
Raw device and local oscillation signal generator generate the sinusoidal signal that difference within the scope of setpoint frequency is always 1MHz, and control controllable radio frequency is opened
Put row of channels selection into.Working frequency is 20MHz, using serial data loading method.
The acquisition receiving module is completed the reception to AD digital signal and is converted accordingly, working frequency 40MHz,
There are two channels in total, only use 1 channel, the alternate channel that another channel is extended as the later period at present.
The digital signal preprocessing module, using FPFA high-speed parallel operation the characteristics of to AD receive and convert after
Digital signal is correspondingly processed, such as zero averaging, FFT, Cordic operation, mitigates the end PC processing pressure, and it is whole to improve system
Body arithmetic speed.That wherein FFT and Cordic is all made of is IP kernel inside fpga chip, working frequency 40MHz.
The memory interface control module is mainly responsible for pre- to the sampled data and digital signal of ADC acquisition receiving module
The intermediate data generated in processing module is cached, and is carried out using MIG IP kernel inside AXI4 bus marco fpga chip
Data write-in and reading, working frequency 125MHz.
The data packet handing module, packages to the output data of digital signal pre-processing module, passes through usb communication
Module is sent to PC；The order packet that the end PC sends over is received to be parsed, being sent to other modules makes them work in an orderly manner,
Working frequency is 40MHz.It sends data packet frame format and received data packet frame format is as shown in Table 1 and Table 2.
Table 1 sends data packet frame format
2 received data packet frame format of table
The usb communication module is the data transmission channel of FPGA and PC, the data packet that data packet handing module is exported
It is sent to USB chip, using being sent to PC after a series of processing；The order packet that the end PC is transmitted is received, and sends it to number
According to packet handing module.Its working frequency is 50MHz, using asynchronous FIFO read-write mode.
As shown in fig. 6, host computer workflow.The host computer interface is designed using QT, is carried out just after system electrification
Beginningization after FPGA board is ready, sends frequency sweep order to FPGA board, including such as scanning initial frequency, end of scan frequency
Rate, scanning accuracy, single frequency point scanning times etc. wait the processing of FPGA board and transmission data later.Host computer receives data
To data into dissection process after packet, processing judges whether the Frequency point is the last one point in swept frequency range after completing, if
It is not the data for continuing waiting for the processing of FPGA board and transmitting next frequency point；Conversely, then being carried out to the data that processing obtains
It saves and exports, show voltage ratio-frequency characteristic and this obtained resonance/anti-resonance frequency value of measurement.
Frequency scanning first carries out coarse scan, then carry out fine scanning, its step are as follows by the way of classification scanning
It is shown:
(1) mode for using coarse scan is arranged corresponding initial frequency and terminates frequency according to SAW device characteristic, scanning
Frequency range is 2MHz, and each scanning step is 10kHz, at this time in work known to the sample frequency of FFT and the relationship of resolution ratio
The points of FFT can reduce to 512 in the case that working frequency is 4M.
(2) the resonance frequency f in step (1) is obtained using resonance frequency lookup methodm1With anti-resonance frequency fm2。
(3) mode of fine scanning, range of scanned frequencies 100kHz are used, setting initial frequency is fm1- 50kHz, knot
Beam frequency is fm1+ 50kHz, each scanning step are 1kHz, and FFT points are 4096.
(4) the resonance frequency f in step (3) is obtained using resonance frequency lookup methodm2。
(5) mode of fine scanning, range of scanned frequencies 100kHz are used, setting initial frequency is fm2- 50kHz, knot
Beam frequency is fm2+ 50kHz, each scanning step are 1kHz, and FFT points are 4096.
(6) the resonance frequency f in step (5) is obtained using resonance frequency lookup methodn2, then fm2And fn2Respectively SAW device
Part final resonance frequency and anti-resonance frequency.
As shown in fig. 7, the resonance frequency point searching work process based on statistical analysis method.It the steps include:
(1) present frequency point component voltage is calculated using following formula and close the ratio r of voltagei, n times measurement is using extension survey
The method that the amount time improves accuracy, A1And A2Respectively Vm1And Vm2Digital signal after treatment:
ri=A1/A2
(2) for each measurement result, judge its corresponding points sequence whether 1024, if it is not, then removal data, otherwise protect
Residual evidence.
(3) its average value is found out according to the following formula respectively to the data of the reservation of step (2)And standard deviation sigma.
(4) by each riWhat value and step (3) were found outAbsolute value is asked to be compared again with σ value after subtracting each other, if discontented
Foot formula, i.e., being greater than standard deviation with mean deviation, (k does corresponding tune according to the case where actual measurement with the product of setting multiple
It is whole), illustrate that biggish interference is received when point measurement causes error larger, removes it；Conversely, then retaining data.
(5) after according to the step of front 4, it is assumed that eliminate M point in total, then find out the average value of N-M point, this value is made
For the voltage ratio of the Frequency point.
(6) it calculates in swept frequency range the component voltage of all frequency points according to the step of front 5 and closes voltage ratio and save.
(7) maximum value and minimum value in the ratio saved in (6) are calculated using ranking method, corresponding frequency point is respectively resonance
Frequency point and antiresonance frequency point.
By test, SAW magnetoelectric transducer lower for Q value, present system can automatically detect that its is humorous
Shake frequency point, and frequency detection range is 35MHz~500MHz, resolution ratio 1kHz, illustrates that the method for the present invention can be in wider frequency rate
The resonance frequency of low reactance-resistance ratio SAW magnetoelectric transducer is relatively accurately measured in range.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (7)
1. a kind of detection method towards low reactance-resistance ratio SAW magnetoelectric transducer resonance frequency characterized by comprising
(1) frequency sweep is carried out to the low reactance-resistance ratio SAW magnetoelectric transducer by high frequency pumping, obtain the divided voltage signal of each frequency point with
Voltage signal is closed, divided voltage signal is successively mixed with conjunction voltage signal, is filtered and analog-to-digital conversion process, digital letter is obtained
Number；
(2) voltage ratio that each frequency point is calculated using pretreated digital signal, the maximum frequency point of voltage ratio is corresponding
Resonance frequency of the frequency as low reactance-resistance ratio SAW magnetoelectric transducer.
2. a kind of detection method towards low reactance-resistance ratio SAW magnetoelectric transducer resonance frequency as described in claim 1, feature exist
In the step (1) includes:
(1-1) generates high-frequency signal using digital form, under the incentive action of high-frequency signal, obtains point electricity of each frequency point
It presses signal and closes voltage signal；
(1-2) to divided voltage signal and is closed when local oscillation signal is differed with high-frequency signal as fixed value using local oscillation signal respectively
Voltage signal carries out down-converted, obtains the mixed frequency signal of divided voltage signal and closes the mixed frequency signal of voltage signal；
(1-3) filters the mixed frequency signal of divided voltage signal and low frequency and high-frequency noise letter in the mixed frequency signal of conjunction voltage signal
Number, intermediate-freuqncy signal is obtained, intermediate-freuqncy signal is converted into digital signal, then digital signal is pre-processed.
3. a kind of detection method towards low reactance-resistance ratio SAW magnetoelectric transducer resonance frequency as claimed in claim 1 or 2, feature
It is, the pretreatment includes: zero averaging, FFT and Cordic operation.
4. a kind of detection method towards low reactance-resistance ratio SAW magnetoelectric transducer resonance frequency as claimed in claim 1 or 2, feature
It is, the step (2) includes:
(2-1) carries out n times measurement to each frequency point, calculates i-th measurement after the measurement result of removal n times measurement midpoint sequence mistake
Voltage ratio average valueAnd standard deviation sigma；
The voltage ratio r that (2-2) is measured when i-thiWith voltage ratio average valueDifference when being greater than k times of standard deviation sigma, remove
The secondary measurement result, otherwise retains measurement result；
(2-3) calculates the final voltage ratio average value of current frequency point as working as using the measurement result retained in step (2-2)
The voltage ratio of preceding frequency point, and then calculate the voltage ratio of each frequency point；
(2-4), will using the corresponding frequency of the maximum frequency point of voltage ratio as the resonance frequency of low reactance-resistance ratio SAW magnetoelectric transducer
Anti-resonance frequency of the corresponding frequency of the smallest frequency point of voltage ratio as low reactance-resistance ratio SAW magnetoelectric transducer.
5. a kind of detection system towards low reactance-resistance ratio SAW magnetoelectric transducer resonance frequency characterized by comprising scan module,
Signal processing module and resonance frequency searching module；
The scan module obtains each frequency point for carrying out frequency sweep to the low reactance-resistance ratio SAW magnetoelectric transducer by high frequency pumping
Divided voltage signal and close voltage signal, divided voltage signal is successively mixed with conjunction voltage signal, is filtered and analog-to-digital conversion
Processing, obtains digital signal；
The signal processing module, the digital signal exported for caching scan module, then pre-processes digital signal,
Pretreated digital signal is sent to resonance frequency searching module；
The resonance frequency searching module will for calculating the voltage ratio of each frequency point using pretreated digital signal
Resonance frequency of the corresponding frequency of the maximum frequency point of voltage ratio as low reactance-resistance ratio SAW magnetoelectric transducer.
6. a kind of detection system towards low reactance-resistance ratio SAW magnetoelectric transducer resonance frequency as claimed in claim 5, feature exist
In the scan module includes: high frequency pumping module, local oscillating module, resonator voltage measuring circuit module, mixing mould
Block, bandpass filtering modules block and A/D conversion module,
High-frequency signal is sent to resonator electricity for generating high-frequency signal using digital form by the high frequency pumping module
Press measuring circuit module；
The local oscillating module, for when it is fixed value that local oscillation signal, which is differed with high-frequency signal, local oscillation signal to be sent to
The rf inputs of frequency mixing module；
The resonator voltage measuring circuit module, under the incentive action of high-frequency signal, obtaining point electricity of each frequency point
It presses signal and closes voltage signal, divided voltage signal is successively sent to the low of frequency mixing module with voltage signal is closed sequentially in time
Frequency input terminal；
The frequency mixing module, for divided voltage signal and closing voltage signal progress down-converted respectively based on local oscillation signal,
It obtains the mixed frequency signal of divided voltage signal and closes the mixed frequency signal of voltage signal；
The bandpass filtering modules block is low in the mixed frequency signal of divided voltage signal and the mixed frequency signal of conjunction voltage signal for filtering
Frequency and HF noise signal, obtain intermediate-freuqncy signal；
The A/D conversion module, for intermediate-freuqncy signal to be converted to digital signal.
7. such as a kind of detection system towards low reactance-resistance ratio SAW magnetoelectric transducer resonance frequency described in claim 5 or 6, feature
It is, the signal processing module includes: double scanning frequency-variable modules, acquisition receiving module, digital signal preprocessing module and interior
Interface control module is deposited,
Double scanning frequency-variable modules, for controlling in the excitation signal generator and local oscillating module in high frequency pumping module
Local oscillation signal generator generate setpoint frequency within the scope of difference be always fixed value sinusoidal signal；
The acquisition receiving module, for acquiring the digital signal of scan module output；
The digital signal preprocessing module, for being pre-processed using FPGA to digital signal；
The memory interface control module, for acquisition receiving module digital signal and digital signal pre-processing module in produce
Raw intermediate data is cached.
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