CN207908659U - The device of periodic modulation Magnetic Sensor sensitivity decrease device noise - Google Patents
The device of periodic modulation Magnetic Sensor sensitivity decrease device noise Download PDFInfo
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- CN207908659U CN207908659U CN201820341877.0U CN201820341877U CN207908659U CN 207908659 U CN207908659 U CN 207908659U CN 201820341877 U CN201820341877 U CN 201820341877U CN 207908659 U CN207908659 U CN 207908659U
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Abstract
The utility model is related to the devices of periodic modulation Magnetic Sensor sensitivity decrease device noise.The utility model includes pulse oscillating circuit, oscillator signal amplifier, Magnetic Sensor, lead loop, magnetic signal amplifier, demodulator circuit and low-pass filter.Pulse oscillating circuit is connected with lead loop, so that lead loop is generated the alternating magnetic field perpendicular to Magnetic Sensor sensitivity axis direction, sensitivity can cyclically-varying under the alternating magnetic field for Magnetic Sensor.When measuring external magnetic field, Wheatstone bridge output is exactly the periodically variable modulated signal of transducer sensitivity；Then demodulator circuit is used to revert to direct current signal by modulated signal is exported.The alternating magnetic field that the utility model lead loop generates is modulated transducer sensitivity, and output signal is made to be mounted on high frequency carrier, reduces influence of the 1/f noise to output signal, solves the problems, such as that existing Magnetic Sensor is excessive in low-frequency range 1/f noise；Detection circuit is simple and sensor detection circuit integrated level is high.
Description
Technical field
The invention belongs to sensor signal detection technical fields, are related to a kind of periodic modulation Magnetic Sensor sensitivity decrease
The device of device noise.
Background technology
Magnetic Sensor is one kind in miscellaneous sensor, it can perceive the change of physical quantity related with magnetic phenomenon
Change, and is transformed into electric signal and is detected.So as to directly or indirectly detect magnetic field size, direction, displacement, angle
The physical messages such as degree, electric current therefore Magnetic Sensor empty day, ocean, geological prospecting, traffic administration, non-destructive testing, target acquisition,
It has been obtained in the field of engineering technology such as medical diagnosis, computer, industrial automation, Internet of Things and smart home extensively and Zhuo Youcheng
The application of effect.
With the development of microelectric technique, Magnetic Sensor develops towards miniaturization, integrated and intelligentized direction.Magnetic resistance
Formula sensor includes anisotropic magnetoresistive (AMR) Magnetic Sensor, giant magnetoresistance (GMR) Magnetic Sensor, magnetic tunnel-junction (TMR) sensing
Device.It is the magnetic susceptibility Detection Techniques to grow up the 1990s.Has the characteristics that small, low in energy consumption, high sensitivity.Magnetic
The measurement accuracy of sensor mainly determines by its signal-to-noise ratio, therefore, reduces the noise of Magnetic Sensor to improving its precision to closing weight
It wants.The noise of Magnetic Sensor includes mainly low frequency 1/f noise, flicker noise and thermal noise.According to noise spectrum, noise power master
It to be contributed by low-frequency noises such as 1/f noise and flicker noises.Thermal noise belongs to white noise, determines that the local of sensor is made an uproar
Sound.The magnetic field sensitivity of sensing element is higher, and 1/f noise is bigger, and most important reason depends on internal magnetic structure
1/f noise can not be inhibited by conventional electrical modulation method.
Cathy Nordman etc. regulate and control the magnetic ability of aggregation of magnetic flux collector using MEMS structure, in certain frequency next week
Phase is vibrated, and is modulated to measured signal, achievees the purpose that reduce or eliminate low-frequency noise.According to the difference of Magnetic Sensor,
1 to 3 orders of magnitude can be reduced per Hz by the 1/f noise of sensor by changing working frequency.The signal modulation means of sensor are to carry
One important means of high sensor detectivity.
Invention content
It is an object of the invention to provide a kind of devices of periodic modulation Magnetic Sensor sensitivity decrease device noise.
The present invention include pulse oscillating circuit, oscillator signal amplifier, Magnetic Sensor, lead loop, magnetic signal amplifier,
Demodulator circuit and low-pass filter.It is characterized in that：One end of the pulse oscillating circuit is connected to oscillator signal amplifier,
Oscillator signal amplifier out is connected in lead loop, the setting of lead loop in Magnetic Sensor surrounding, Magnetic Sensor
Output end is connected on magnetic signal amplifier, and the output end of magnetic signal amplifier is connected on demodulator circuit, demodulator circuit it is defeated
Go out to be connected on low-pass filter, the other end of impulse hunting electricity is connected in demodulator circuit on reference signal input terminal.
Preferably, the lead loop is placed on right over Magnetic Sensor or underface.
Preferably, the Magnetic Sensor is anisotropy magnetosensitive resistance, giant magnetoresistance mistor or tunnel knot composition
Wheatstone bridge configuration.
The present invention is modulated transducer sensitivity using the alternating magnetic field that lead loop generates, and output signal is made to carry
On high frequency carrier, influence of the 1/f noise to output signal is reduced, solves existing Magnetic Sensor in low-frequency range 1/f noise mistake
Big problem；Detection circuit is simple and sensor detection circuit integrated level is high.
Description of the drawings
Fig. 1 is the circuit diagram of the present invention；
Fig. 2 is the operation principle structure chart of the present invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
As shown in Figure 1, a kind of device of periodic modulation Magnetic Sensor sensitivity decrease device noise of the present invention, packet
Include pulse oscillating circuit 1, oscillator signal amplifier 2, Magnetic Sensor 3, lead loop 4, magnetic signal amplifier 5, demodulator circuit 6 and
Low-pass filter 7.
One end of pulse oscillating circuit 1 is connected to oscillator signal amplifier 2, and 2 output end of oscillator signal amplifier is connected to
In lead loop 4, the lower section of lead loop 4 has Magnetic Sensor 3, the output end of Magnetic Sensor 3 to be connected to magnetic signal amplifier 5
On, the output end of magnetic signal amplifier 5 is connected on demodulator circuit 6, and the output of demodulator circuit 6 is connected on low-pass filter 7,
The other end of pulse oscillation circuit 1 is connected in demodulator circuit 6 on reference signal input terminal.
Lead loop is placed on right over Magnetic Sensor as shown in Figure 2 or underface, generated magnetic direction hang down
Directly in the sensitive axis direction of mistor, to the sensitivity of modulation sensor, to be modulated to the output for being tested magnetic field.
The Magnetic Sensor is the Wheatstone bridge of anisotropy magnetosensitive resistance, giant magnetoresistance mistor or tunnel knot composition
Structure.
It is as follows using the course of work of above-mentioned apparatus：Due to pulse oscillating circuit output pulse oscillator signal, believe through concussion
Number amplifier is amplified into lead loop, makes the modulation magnetic field that period alternation is generated around lead loop, the modulation magnetic of generation
Field action is in the vertical sensitive axis direction of Magnetic Sensor.
After the period action of alternating magnetic field for the vertical sensitive axis direction that Magnetic Sensor is generated by lead loop in step 1
Sensitivity will present cyclically-varying, realize the purpose of modulation Magnetic Sensor sensitivity.
When Magnetic Sensor detects external magnetic field signal, Magnetic Sensor can load in institute the response signal that external signal generates
On the high frequency carrier for stating the generation of period alternating magnetic field, that is, export modulated signal.
The modulated signal that Magnetic Sensor exports is connected to after amplifier on demodulator circuit and is demodulated, demodulator circuit is defeated
Outlet is connected on low-pass filter, can output modulated signal be reverted to direct current signal after demodulation filtering, be played and 1/f is inhibited to make an uproar
The effect of sound and high-frequency noise.
Specifically, modulated signal is connected to demodulator circuit input terminal, pulse shake after power amplifier carries out waveform amplification
The other end for swinging device is connected to another input terminal of demodulator circuit, and one is inputted with modulated signal with frequently with phase for demodulator circuit
Reference signal.Demodulator circuit is demodulated, because the noise in modulated signal is uncorrelated to reference signal, by low pass filtered after demodulation
Wave device can be filtered out, only retain with output signal with frequency with phase effective low-frequency d output signal, play inhibit 1/f noise with
The effect of high-frequency noise.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Profit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent requirements of the claims
Variation is included within the present invention.Any reference signs in the claims should not be construed as limiting the involved claims.
Claims (3)
1. the device of periodic modulation Magnetic Sensor sensitivity decrease device noise, including pulse oscillating circuit, oscillator signal are put
Big device, Magnetic Sensor, lead loop, magnetic signal amplifier, demodulator circuit and low-pass filter；It is characterized in that：The arteries and veins
The one end for rushing oscillating circuit is connected to oscillator signal amplifier, and oscillator signal amplifier out is connected in lead loop, leads
The setting of line coil is connected in Magnetic Sensor surrounding, the output end of Magnetic Sensor on magnetic signal amplifier, magnetic signal amplifier
Output end be connected on demodulator circuit, the output of demodulator circuit is connected on low-pass filter, the other end of impulse hunting electricity
It is connected in demodulator circuit on reference signal input terminal.
2. the device of periodic modulation Magnetic Sensor sensitivity decrease device noise as described in claim 1, it is characterised in that：
The lead loop is placed on right over Magnetic Sensor or underface.
3. the device of periodic modulation Magnetic Sensor sensitivity decrease device noise as described in claim 1, it is characterised in that：
The Magnetic Sensor is the wheatstone bridge configuration of anisotropy magnetosensitive resistance, giant magnetoresistance mistor or tunnel knot composition.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820341877.0U CN207908659U (en) | 2018-03-13 | 2018-03-13 | The device of periodic modulation Magnetic Sensor sensitivity decrease device noise |
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| CN201820341877.0U CN207908659U (en) | 2018-03-13 | 2018-03-13 | The device of periodic modulation Magnetic Sensor sensitivity decrease device noise |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108414951A (en) * | 2018-03-13 | 2018-08-17 | 海宁嘉晨汽车电子技术有限公司 | The method and device of periodic modulation Magnetic Sensor sensitivity decrease device noise |
| CN111198348A (en) * | 2020-01-08 | 2020-05-26 | 杭州电子科技大学 | Calibration method for noise test system of magnetic sensor |
| CN112284382A (en) * | 2020-10-23 | 2021-01-29 | 哈尔滨工程大学 | Combined navigation information processing device and underwater navigation system |
-
2018
- 2018-03-13 CN CN201820341877.0U patent/CN207908659U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108414951A (en) * | 2018-03-13 | 2018-08-17 | 海宁嘉晨汽车电子技术有限公司 | The method and device of periodic modulation Magnetic Sensor sensitivity decrease device noise |
| CN111198348A (en) * | 2020-01-08 | 2020-05-26 | 杭州电子科技大学 | Calibration method for noise test system of magnetic sensor |
| CN111198348B (en) * | 2020-01-08 | 2021-12-21 | 杭州电子科技大学 | Calibration method for noise test system of magnetic sensor |
| CN112284382A (en) * | 2020-10-23 | 2021-01-29 | 哈尔滨工程大学 | Combined navigation information processing device and underwater navigation system |
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Address after: 430000 South Zone 1, floor 1, auxiliary workshop, plot 2mA, Wuhan Economic and Technological Development Zone, Wuhan City, Hubei Province Patentee after: Wuhan Jiachen Electronic Technology Co.,Ltd. Address before: 314400 Room 408, No. 11, Weisan Road, Haining high tech Industrial Park, Hangzhou, Zhejiang Patentee before: HAINING JIACHEN AUTOMOBILE ELECTRONIC TECHNOLOGY Co.,Ltd. |
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Address after: 430000, No. 138 Fengshu 6th Road, Wuhan Economic and Technological Development Zone, Wuhan City, Hubei Province Patentee after: Wuhan Jiachen Electronic Technology Co.,Ltd. Country or region after: China Address before: 430000 South Zone 1, floor 1, auxiliary workshop, plot 2mA, Wuhan Economic and Technological Development Zone, Wuhan City, Hubei Province Patentee before: Wuhan Jiachen Electronic Technology Co.,Ltd. Country or region before: China |