CN108008323A - A kind of magnetic signal measuring device and method based on low-pass filtering - Google Patents
A kind of magnetic signal measuring device and method based on low-pass filtering Download PDFInfo
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- CN108008323A CN108008323A CN201711155904.1A CN201711155904A CN108008323A CN 108008323 A CN108008323 A CN 108008323A CN 201711155904 A CN201711155904 A CN 201711155904A CN 108008323 A CN108008323 A CN 108008323A
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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
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Abstract
The present invention provides a kind of magnetic signal measuring device and method based on low-pass filtering, belong to measurement and the detection field of magnetic signal.Magnetic signal measuring method of the invention based on low-pass filtering concretely comprises the following steps：Step 1：Industrial personal computer is run, and control digital-to-analogue output module output two-way angular frequency is respectively ω1And ω2Sinusoidal signal；Step 2：It is ω that two-way sinusoidal signal driving coil produces angular frequency in space1And ω2Alternating magnetic field；Step 3：Signal receiver receives the magnetic signal in alternating magnetic field, and the magnetic signal received is converted to electric signal, is transferred to modulus sampling module；Step 4：Discrete data sequence is converted into after the processing of modulus sampling module and is transmitted to industrial personal computer；Step 5：Industrial personal computer is further processed data sequence, is ω by angular frequency1And ω2Reference signal be multiplied with measuring signal, DC component therein is extracted using low-pass filter, it is respectively ω that frequency is obtained after computing1And ω2AC compounent amplitude A1And A2, realize the detection of the magnetic signal to two frequencies.
Description
Technical field
The present invention relates to a kind of magnetic signal measuring device and method based on low-pass filtering, belong to the measurement and inspection of magnetic signal
Survey field.
Background technology
Paper《Weak magnetic signal acquisition system design based on magnetoresistive sensor》(sensor and micro-system, Wang Yonglong, poplar
Defend, Shi Yunbo, Zhang Wendong, 20080120) in propose a kind of weak magnetic signal collection side based on anisotropic magnetoresistive sensor
Method.This method nurses one's health the analog signal collected using hardware circuit, utilizes instrument amplifier suppression common mode signal.Through
The experimental verification system can realize the collection to weak magnetic signal；Although collection to weak magnetic signal can be realized and to common-mode noise
Suppression, but may measure stability weak magnetic that is poor, and collecting there are the problems such as null offset when in use
Signal is analog signal, need to separately plus AD devices during applied in digital display circuit.
Paper《Application of the Methods for Wavelet Denoising Used in the detection of target magnetic signal》(China Shipbuilding Industry Corporation the 7th one
〇 research institutes, Yang Yong, Shi Chao, Dong Hao, 20150215) propose and a kind of the magnetic anomaly of low signal-to-noise ratio is believed using wavelet analysis in
Number carry out denoising method.This method first builds magnetic target dipole model, and emulation obtains the noisy magnetic anomaly of magnetic target
Regular signal, reapplies wavelet method and carries out de-noising to signals and associated noises, and magnetic anomaly letter can be effectively improved through emulation experiment verification
Number detectability；Although the detectability to magnetic anomaly regular signal can be effectively improved in emulation experiment, in reality
Exist in and calculate the problems such as complicated, be not suitable for the higher occasion of the requirement of real-time such as navigator fix.
The content of the invention
The purpose of the present invention is to solve the above-mentioned problems of the prior art, and then one kind is provided and is based on low-pass filtering
Magnetic signal measuring device and method.
The purpose of the present invention is what is be achieved through the following technical solutions：
A kind of magnetic signal measuring device based on low-pass filtering of the present invention, the magnetic signal measurement dress based on low-pass filtering
Put including industrial personal computer, digital-to-analogue output module, modulus sampling module, coil and signal receiver；The output terminal of industrial personal computer is connected to
The input terminal of digital-to-analogue output module；The output terminal of digital-to-analogue output module is connected to the input terminal of coil；The output of signal receiver
End is connected to the input terminal of modulus sampling module；The output terminal of modulus sampling module is connected to the input terminal of industrial personal computer.
A kind of magnetic signal measuring device based on low-pass filtering of the present invention, the coil include coil one and coil
Two, the output terminal of digital-to-analogue output module is connected to the input terminal of coil one；The output terminal of digital-to-analogue output module is connected to coil two
Input terminal.
A kind of magnetic signal measuring device based on low-pass filtering of the present invention, the digital-to-analogue output module are exported using DA
Card；Modulus sampling module uses AD sampling cards；DA output cards and AD sampling cards are installed on the industrial personal computer.
A kind of magnetic signal measuring device based on low-pass filtering of the present invention, the modulus sampling module include preceding put
Big device, frequency overlapped-resistable filter and sampling holder.
A kind of magnetic signal measuring method based on low-pass filtering of the present invention, the magnetic signal measurement side based on low-pass filtering
Method concretely comprises the following steps：
Step 1：Industrial personal computer is run, and control digital-to-analogue output module output two-way angular frequency is respectively ω1And ω2Sinusoidal letter
Number；
Step 2：It is ω that two-way sinusoidal signal driving coil produces angular frequency in space1And ω2Alternating magnetic field；
Step 3：Signal receiver receives the magnetic signal in alternating magnetic field, and the magnetic signal received is converted to telecommunications
Number, it is transferred to modulus sampling module；
Step 4：Discrete data sequence is converted into after the processing of modulus sampling module and is transmitted to industrial personal computer；
Step 5：Industrial personal computer is further processed data sequence, is ω by angular frequency1And ω2Reference signal and measurement
Signal multiplication, extracts DC component therein, it is respectively ω that frequency is obtained after computing using low-pass filter1And ω2Friendship
The amplitude A of flow component1And A2, realize the detection of the magnetic signal to two frequencies.
A kind of magnetic signal measuring method based on low-pass filtering of the present invention, the concrete processing procedure of the step 5
For：
The measuring signal form that signal receiver receives is
X (t)=x1(t)+x2(t)=A1sin(ω1t+φ1)+A2sin(ω2t+φ2)
Wherein x1(t) the corresponding magnetic induction intensity in magnetic field produced for coil one, x2(t) magnetic field pair produced for coil two
The magnetic induction intensity answered, φ1、φ2For two sinusoidal components in measuring signal and the phase difference of reference signal；
In order to extract the amplitude A of one corresponding magnetic induction intensity of coil1, the use of angular frequency is ω1Reference signal to survey
Amount signal is handled；The form of reference signal is
r1(t)=2sin (ω1t)
r1' (t)=2cos (ω1t)
Two reference signals are multiplied with measuring signal respectively, can be obtained
y1(t)=x (t) r1(t)=[A1sin(ω1t+φ1)+A2sin(ω2t+φ2)]×2sin(ω1t)
=A1cosφ1-A1cos(2ω1t+φ1)+A2cos[(ω2-ω1)t+φ2]-A2cos[(ω2+ω1)t+φ2]
y1' (t)=x (t) r1' (t)=[A1sin(ω1t+φ1)+A2sin(ω2t+φ2)]×2cos(ω1t)
=A1sinφ1+A1sin(2ω1t+φ1)+A2sin[(ω2-ω1)t+φ2]+A2sin[(ω2+ω1)t+φ2]
From above formula, y1(t) and y1It is respectively 2 ω to contain DC component and three angular frequencies in ' (t)1、ω2-ω1、
ω2+ω1AC compounent；Cutoff frequency is used as ω0Low-pass filter to y1(t) and y1' (t) carries out low-pass filtering treatment,
DC component therein is obtained, i.e.,
LPF[y1(t)]=A1cosφ1
LPF[y1' (t)]=A1sinφ1
The cutoff frequency ω of low-pass filter at this time0It should meet
The amplitude that can obtain the corresponding magnetic induction intensity of coil one (4) is handled the result of low-pass filtering
It is ω with angular frequency using same method2Reference signal measuring signal is handled, coil can be obtained
The amplitude A of two corresponding magnetic induction intensity2。
A kind of magnetic signal measuring device based on low-pass filtering of the invention is realized to the magnetic signal of two kinds of frequencies with method
Gather and measure at the same time, the occasion for gathering a variety of magnetic signals at the same time in needs such as magnetic beacon positioning can be applied.The present invention uses
With tested magnetic signal with frequency sinusoidal signal as signal refer to, simplify the meter of extraction measured signal amplitude in measurement process
Calculation process, improves the real-time of measuring system, it is applied in the higher occasion of the requirement of real-time such as navigator fix；This
The signal of invention final output is digital signal, can be directly applied in digital display circuit.
Brief description of the drawings
Fig. 1 is the structure diagram of magnetic signal measuring device and method of the present invention based on low-pass filtering.
In figure：1 is industrial personal computer；2 be digital-to-analogue output module；3 be modulus sampling module；4 be coil one；5 be coil two；6
For signal receiver.
Embodiment
Below in conjunction with attached drawing, the present invention is described in further detail：The present embodiment using technical solution of the present invention as
Under the premise of implemented, give detailed embodiment, but protection scope of the present invention is not limited to following embodiments.
Embodiment one：As shown in Figure 1, a kind of magnetic signal measuring device based on low-pass filtering involved by the present embodiment,
Described device includes industrial personal computer, digital-to-analogue output module, modulus sampling module, coil and signal receiver；The output terminal of industrial personal computer
It is connected to the input terminal of digital-to-analogue output module；The output terminal of digital-to-analogue output module is connected to the input terminal of coil；Signal receiver
Output terminal be connected to the input terminal of modulus sampling module；The output terminal of modulus sampling module is connected to the input terminal of industrial personal computer.
Embodiment two：As shown in Figure 1, a kind of magnetic signal measuring device based on low-pass filtering involved by the present embodiment,
The coil includes coil one and coil two, and the output terminal of digital-to-analogue output module is connected to the input terminal of coil one；Digital-to-analogue exports
The output terminal of module is connected to the input terminal of coil two.
Digital-to-analogue output module outputs electrical signals to coil one and coil two, and the coil of energization produces magnetic field, so coil one
Two magnetic fields can be produced with coil two.
Embodiment three：As shown in Figure 1, a kind of magnetic signal measuring device based on low-pass filtering involved by the present embodiment,
The digital-to-analogue output module uses DA output cards；Modulus sampling module uses AD sampling cards；It is defeated that DA is installed on the industrial personal computer
Card release and AD sampling cards.
DA output cards and AD sampling cards are housed on industrial control computer mainboard, the processing output numeral letter of data is realized by industrial personal computer
Number, analog-digital commutator need not be installed additional in digital display circuit, signal can be used directly.
Example IV：As shown in Figure 1, a kind of magnetic signal measuring device based on low-pass filtering involved by the present embodiment,
The modulus sampling module includes preamplifier, frequency overlapped-resistable filter and sampling holder.
Signal can be amplified by modulus sampling module, filter and the preservation of sample value processing.
Embodiment five：As shown in Figure 1, a kind of magnetic signal measuring method based on low-pass filtering involved by the present embodiment,
The magnetic signal measuring method based on low-pass filtering concretely comprises the following steps：
Step 1：Industrial personal computer is run, and control digital-to-analogue output module output two-way angular frequency is respectively ω1And ω2Sinusoidal letter
Number；
Step 2：It is ω that two-way sinusoidal signal driving coil produces angular frequency in space1And ω2Alternating magnetic field；
Step 3：Signal receiver receives the magnetic signal in alternating magnetic field, and the magnetic signal received is converted to telecommunications
Number, it is transferred to modulus sampling module；
Step 4：Discrete data sequence is converted into after the processing of modulus sampling module and is transmitted to industrial personal computer；
Step 5：Industrial personal computer is further processed data sequence, is ω by angular frequency1And ω2Reference signal and measurement
Signal multiplication, extracts DC component therein, it is respectively ω that frequency is obtained after computing using low-pass filter1And ω2Friendship
The amplitude A of flow component1And A2, realize the detection of the magnetic signal to two frequencies.
Collection and measurement, can apply same in two magnetic beacons while the present invention realizes the magnetic signal to two kinds of frequencies
When the occasion that works.
Embodiment six：A kind of as shown in Figure 1, magnetic signal measurement side based on low-pass filtering involved by the present embodiment
Method, the concrete processing procedure of the step 5 are：
The measuring signal form that signal receiver receives is
X (t)=x1(t)+x2(t)=A1sin(ω1t+φ1)+A2sin(ω2t+φ2)
Wherein x1(t) the corresponding magnetic induction intensity in magnetic field produced for coil one, x2(t) magnetic field pair produced for coil two
The magnetic induction intensity answered, φ1、φ2For two sinusoidal components in measuring signal and the phase difference of reference signal；
In order to extract the amplitude A of one corresponding magnetic induction intensity of coil1, the use of angular frequency is ω1Reference signal to survey
Amount signal is handled；The form of reference signal is
r1(t)=2sin (ω1t)
r1' (t)=2cos (ω1t)
Two reference signals are multiplied with measuring signal respectively, can be obtained
y1(t)=x (t) r1(t)=[A1sin(ω1t+φ1)+A2sin(ω2t+φ2)]×2sin(ω1t)
=A1cosφ1-A1cos(2ω1t+φ1)+A2cos[(ω2-ω1)t+φ2]-A2cos[(ω2+ω1)t+φ2]
y1' (t)=x (t) r1' (t)=[A1sin(ω1t+φ1)+A2sin(ω2t+φ2)]×2cos(ω1t)
=A1sinφ1+A1sin(2ω1t+φ1)+A2sin[(ω2-ω1)t+φ2]+A2sin[(ω2+ω1)t+φ2]
From above formula, y1(t) and y1It is respectively 2 ω to contain DC component and three angular frequencies in ' (t)1、ω2-ω1、
ω2+ω1AC compounent；Cutoff frequency is used as ω0Low-pass filter to y1(t) and y1' (t) carries out low-pass filtering treatment,
DC component therein is obtained, i.e.,
LPF[y1(t)]=A1cosφ1
LPF[y1' (t)]=A1sinφ1
The cutoff frequency ω of low-pass filter at this time0It should meet
The amplitude that can obtain the corresponding magnetic induction intensity of coil one (4) is handled the result of low-pass filtering
It is ω with angular frequency using same method2Reference signal measuring signal is handled, coil can be obtained
The amplitude A of two corresponding magnetic induction intensity2。
Present invention employs, as signal is referred to, enormously simplify measurement process with the sinusoidal signal of measured signal same frequency
The calculating process of middle extraction measured signal amplitude, improves the real-time of measuring system.
The foregoing is only a preferred embodiment of the present invention, these embodiments are all based on the present invention
Different implementations under general idea, and protection scope of the present invention is not limited thereto, it is any to be familiar with the art
Technical staff the invention discloses technical scope in, the change or replacement that can readily occur in, should all cover the present invention's
Within protection domain.Therefore, protection scope of the present invention should be subject to the protection domain of claims.
Claims (6)
1. a kind of magnetic signal measuring device based on low-pass filtering, it is characterised in that the magnetic signal based on low-pass filtering is surveyed
Amount device includes industrial personal computer (1), digital-to-analogue output module (2), modulus sampling module (3), coil and signal receiver (6)；Industry control
The output terminal of machine (1) is connected to the input terminal of digital-to-analogue output module (2)；The output terminal of digital-to-analogue output module (2) is connected to coil
Input terminal；The output terminal of signal receiver (6) is connected to the input terminal of modulus sampling module (3)；Modulus sampling module (3)
Output terminal is connected to the input terminal of industrial personal computer (1).
A kind of 2. magnetic signal measuring device based on low-pass filtering according to claim 1, it is characterised in that the coil
Including coil one (4) and coil two (5), the output terminal of digital-to-analogue output module (2) is connected to the input terminal of coil one (4)；Digital-to-analogue
The output terminal of output module (2) is connected to the input terminal of coil two (5).
A kind of 3. magnetic signal measuring device based on low-pass filtering according to claim 1, it is characterised in that the digital-to-analogue
Output module (2) uses DA output cards；Modulus sampling module (3) uses AD sampling cards；It is defeated that DA is installed on the industrial personal computer (1)
Card release and AD sampling cards.
A kind of 4. magnetic signal measuring device based on low-pass filtering according to claim 1, it is characterised in that the modulus
Sampling module (3) includes preamplifier, frequency overlapped-resistable filter and sampling holder.
5. a kind of measuring method of 1,2, the 3 or 4 magnetic signal measuring device based on low-pass filtering of usage right requirement, it is special
Sign is that the magnetic signal measuring method based on low-pass filtering concretely comprises the following steps：
Step 1：Industrial personal computer (1) is run, and control digital-to-analogue output module (2) output two-way angular frequency is respectively ω1And ω2Sine
Signal；
Step 2：It is ω that two-way sinusoidal signal driving coil produces angular frequency in space1And ω2Alternating magnetic field；
Step 3：Signal receiver (6) receives the magnetic signal in alternating magnetic field, and the magnetic signal received is converted to telecommunications
Number, it is transferred to modulus sampling module (3)；
Step 4：Discrete data sequence is converted into after the processing of modulus sampling module (3) and is transmitted to industrial personal computer (1)；
Step 5：Industrial personal computer (1) is further processed data sequence, is ω by angular frequency1And ω2Reference signal and measurement
Signal multiplication, extracts DC component therein, it is respectively ω that frequency is obtained after computing using low-pass filter1And ω2Friendship
The amplitude A of flow component1And A2, realize the detection of the magnetic signal to two frequencies.
A kind of 6. magnetic signal measuring method based on low-pass filtering according to claim 5, it is characterised in that the step
Five concrete processing procedure is：
The measuring signal form that signal receiver (6) receives is
X (t)=x1(t)+x2(t)=A1sin(ω1t+φ1)+A2sin(ω2t+φ2)
Wherein x1(t) the corresponding magnetic induction intensity in magnetic field produced for coil one (4), x2(t) magnetic field produced for coil two (5)
Corresponding magnetic induction intensity, φ1、φ2For two sinusoidal components in measuring signal and the phase difference of reference signal；
In order to extract the amplitude A of the corresponding magnetic induction intensity of coil one (4)1, the use of angular frequency is ω1Reference signal to survey
Amount signal is handled；The form of reference signal is
r1(t)=2sin (ω1t)
r1' (t)=2cos (ω1t)
Two reference signals are multiplied with measuring signal respectively, can be obtained
y1(t)=x (t) r1(t)=[A1sin(ω1t+φ1)+A2sin(ω2t+φ2)]×2sin(ω1t)
=A1cosφ1-A1cos(2ω1t+φ1)+A2cos[(ω2-ω1)t+φ2]-A2cos[(ω2+ω1)t+φ2]
y1' (t)=x (t) r1' (t)=[A1sin(ω1t+φ1)+A2sin(ω2t+φ2)]×2cos(ω1t)
=A1sinφ1+A1sin(2ω1t+φ1)+A2sin[(ω2-ω1)t+φ2]+A2sin[(ω2+ω1)t+φ2]
From above formula, y1(t) and y1It is respectively 2 ω to contain DC component and three angular frequencies in ' (t)1、ω2-ω1、ω2+
ω1AC compounent；Cutoff frequency is used as ω0Low-pass filter to y1(t) and y1' (t) carries out low-pass filtering treatment, obtains
DC component therein is obtained, i.e.,
LPF[y1(t)]=A1cosφ1
LPF[y1' (t)]=A1sinφ1
The cutoff frequency ω of low-pass filter at this time0It should meet
<mfenced open = "{" close = "">
<mtable>
<mtr>
<mtd>
<mrow>
<msub>
<mi>&omega;</mi>
<mn>0</mn>
</msub>
<mo><</mo>
<mn>2</mn>
<msub>
<mi>&omega;</mi>
<mn>1</mn>
</msub>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<msub>
<mi>&omega;</mi>
<mn>0</mn>
</msub>
<mo><</mo>
<mo>|</mo>
<msub>
<mi>&omega;</mi>
<mn>2</mn>
</msub>
<mo>-</mo>
<msub>
<mi>&omega;</mi>
<mn>1</mn>
</msub>
<mo>|</mo>
</mrow>
</mtd>
</mtr>
</mtable>
</mfenced>
The amplitude that can obtain the corresponding magnetic induction intensity of coil one (4) is handled the result of low-pass filtering
<mrow>
<msub>
<mi>A</mi>
<mn>1</mn>
</msub>
<mo>=</mo>
<msqrt>
<mrow>
<msup>
<mrow>
<mo>(</mo>
<mi>L</mi>
<mi>P</mi>
<mi>F</mi>
<mo>&lsqb;</mo>
<msub>
<mi>y</mi>
<mn>1</mn>
</msub>
<mo>(</mo>
<mi>t</mi>
<mo>)</mo>
<mo>&rsqb;</mo>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
<mo>+</mo>
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<mo>(</mo>
<mi>L</mi>
<mi>P</mi>
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<mo>&lsqb;</mo>
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<mi>y</mi>
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</msqrt>
</mrow>
It is ω with angular frequency using same method2Reference signal measuring signal is handled, coil two (5) can be obtained
The amplitude A of corresponding magnetic induction intensity2。
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Family
ID=62052757
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112393730A (en) * | 2020-11-19 | 2021-02-23 | 哈尔滨工业大学 | Magnetic beacon positioning method and system based on magnetic induction intensity and characteristic vector |
| CN112816751A (en) * | 2020-09-22 | 2021-05-18 | 微传智能科技（常州）有限公司 | Electricity stealing detection system and method |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1709203A (en) * | 2005-07-01 | 2005-12-21 | 天津大学 | Analogue demodulation mode mixing biological impedance measuring method |
| CN101285692A (en) * | 2008-06-04 | 2008-10-15 | 中国科学院长春光学精密机械与物理研究所 | Delicate signal detection device |
| CN102495380A (en) * | 2011-12-13 | 2012-06-13 | 华北电力大学 | Digital signal locking type spatial magnetic field detecting system |
| CN103018562A (en) * | 2012-12-05 | 2013-04-03 | 上海电机学院 | Synchronous multi-frequency impedance measurement method and device |
| CN103389126A (en) * | 2013-07-03 | 2013-11-13 | 中国科学院宁波材料技术与工程研究所 | Method and device for processing weak signals |
| US8841905B2 (en) * | 2009-12-31 | 2014-09-23 | 3S Hi-Technologies Co., Ltd. | System and method for fiber magneto-optic detection |
| CN105245194A (en) * | 2015-11-09 | 2016-01-13 | 哈尔滨工业大学 | Dual-phase lock-in amplifier based on DSP (Digital Signal Processor) and LabVIEW |
| CN105676008A (en) * | 2016-01-15 | 2016-06-15 | 中国电力科学研究院 | Digital electric field sensor |
-
2017
- 2017-11-20 CN CN201711155904.1A patent/CN108008323A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1709203A (en) * | 2005-07-01 | 2005-12-21 | 天津大学 | Analogue demodulation mode mixing biological impedance measuring method |
| CN101285692A (en) * | 2008-06-04 | 2008-10-15 | 中国科学院长春光学精密机械与物理研究所 | Delicate signal detection device |
| US8841905B2 (en) * | 2009-12-31 | 2014-09-23 | 3S Hi-Technologies Co., Ltd. | System and method for fiber magneto-optic detection |
| CN102495380A (en) * | 2011-12-13 | 2012-06-13 | 华北电力大学 | Digital signal locking type spatial magnetic field detecting system |
| CN103018562A (en) * | 2012-12-05 | 2013-04-03 | 上海电机学院 | Synchronous multi-frequency impedance measurement method and device |
| CN103389126A (en) * | 2013-07-03 | 2013-11-13 | 中国科学院宁波材料技术与工程研究所 | Method and device for processing weak signals |
| CN105245194A (en) * | 2015-11-09 | 2016-01-13 | 哈尔滨工业大学 | Dual-phase lock-in amplifier based on DSP (Digital Signal Processor) and LabVIEW |
| CN105676008A (en) * | 2016-01-15 | 2016-06-15 | 中国电力科学研究院 | Digital electric field sensor |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112816751A (en) * | 2020-09-22 | 2021-05-18 | 微传智能科技（常州）有限公司 | Electricity stealing detection system and method |
| CN112393730A (en) * | 2020-11-19 | 2021-02-23 | 哈尔滨工业大学 | Magnetic beacon positioning method and system based on magnetic induction intensity and characteristic vector |
| CN112393730B (en) * | 2020-11-19 | 2022-10-11 | 哈尔滨工业大学 | Magnetic beacon positioning method and system based on magnetic induction intensity and characteristic vector |
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