CN115327449A - AMR vector magnetic gradiometer - Google Patents
AMR vector magnetic gradiometer Download PDFInfo
- Publication number
- CN115327449A CN115327449A CN202210866816.7A CN202210866816A CN115327449A CN 115327449 A CN115327449 A CN 115327449A CN 202210866816 A CN202210866816 A CN 202210866816A CN 115327449 A CN115327449 A CN 115327449A
- Authority
- CN
- China
- Prior art keywords
- amr
- magnetic field
- module
- output
- chip sensor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
- G01R33/022—Measuring gradient
-
- 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
- G01R33/06—Measuring direction or magnitude of magnetic fields or magnetic flux using galvano-magnetic devices
- G01R33/09—Magnetoresistive devices
- G01R33/096—Magnetoresistive devices anisotropic magnetoresistance sensors
Landscapes
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Measuring Magnetic Variables (AREA)
Abstract
An AMR vector magnetic gradiometer comprises a front-end magnetic field gradient measuring probe and a PCB (printed circuit board) of which the rear end is used for signal conditioning; the front-end magnetic field gradient measuring probe consists of two AMR chip sensors and converts the magnetic field at the measuring position into a voltage signal to be output; the rear-end signal conditioning circuit comprises a preamplifier module, a differential amplifier module, a synchronous detection module, a synchronous clock, an integration module, a V/I conversion circuit and a low-pass filter LPF, and directly outputs a voltage signal in direct proportion to the gradient of the magnetic field. The AMR vector magnetic gradiometer has the advantages of high sensitivity and small volume; the method can measure a weak magnetic field under the non-shielding condition, and adjust the gradient sensitivity of the AMR gradiometer according to different measuring objects.
Description
Technical Field
The invention relates to the technical field of magnetic field measurement, in particular to an AMR vector magnetic gradiometer which is used for measuring magnetic field gradient.
Background
Magnetic field gradient measurements are generally divided into two types, one is total field gradient, and the total field gradient is generally obtained by subtracting two total field magnetometers separated by a certain distance. The other is a magnetic field gradient tensor measurement, which measures the spatial rate of change of three magnetic field components. The magnetic field gradient measurement can effectively eliminate environmental noise and background magnetic field, and is widely applied to a plurality of fields of geophysical resource survey, aviation and navigation magnetic survey, non-explosive positioning, biological magnetic field measurement and the like in recent years.
The total field gradiometer generally realizes total field gradient measurement by combining two proton or optical pump probes and two sets of signal processing units. Magnetic field gradient tensor measurement typically uses vector gradiometers to perform gradient measurement on each magnetic field component, and since vector magnetic field gradient measurement can reflect weak magnetic anomalies, various vector magnetic gradiometers have been proposed in recent years. The fluxgate vector gradiometer uses a double-path structure for gradient measurement, and has the problem of measurement consistency. The SQUID type vector gradiometer uses a dual-channel structure to carry out gradient measurement, and the problem of measurement consistency also exists. The SQUID type vector gradiometer has strict requirements on the working temperature, so that the volume of the integral gradient measurement system is larger. The two fluxgate sensors are integrated by the plate-level fluxgate gradiometer, so that the consistency problem is solved, but the integrated fluxgate sensor probe is special in manufacturing process and difficult to manufacture in batches. Present magnetic gradiometer, total field magnetic gradiometer carries out magnetic field measurement through two magnetometer probes earlier, then carry out signal processing and data acquisition respectively through two modulate circuit, carry out outside difference after the output, two independent modulate circuit and data acquisition system have necessarily leaded to the gradiometer overall structure of constitution complicated, the volume is great, the cable also can increase measuring circuit's noise in transmission process, carry out outside difference at last, because output signal is inconsistent, can lead to measuring the unsafe problem of magnetic field gradient. The current vector gradiometer has the problems of measurement consistency, large volume, high cost, complex manufacturing process and the like.
Disclosure of Invention
In view of a series of problems existing in the current vector magnetic gradiometer, the invention provides an AMR vector magnetic gradiometer, and a gradient probe of the AMR vector magnetic gradiometer uses two AMR chip sensors to form an integrated small-volume gradiometer. The plate gradiometer can not only eliminate background magnetic field and environmental magnetic noise, but also effectively reduce the volume of the gradiometer, and greatly increase the usable range of the gradiometer. In addition, the voltage output by the gradiometer is directly linear with the measured magnetic field gradient.
The technical scheme adopted by the invention is as follows:
an AMR vector magnetic gradiometer comprising:
the front end magnetic field gradient measuring probe comprises a first AMR chip sensor and a second AMR chip sensor,
the front-end magnetic field gradient measuring probe is used for converting the magnetic field size into a voltage signal and outputting the voltage signal;
the front-end magnetic field gradient measuring probe is connected with the rear-end signal conditioning circuit module, and the rear-end signal conditioning circuit module is used for outputting a voltage signal in direct proportion to the magnetic field gradient.
The first AMR chip sensor and the second AMR chip sensor are welded at two ends of a PCB of the probe, the distance d between base lines is 10cm, and the welding direction of the first AMR chip sensor and the welding direction of the second AMR chip sensor are consistent with the direction of a measured magnetic field, namely the gradient direction of the measured magnetic field is consistent with the direction of the base lines.
The first AMR chip sensor and the second AMR chip sensor are single-axis magnetoresistive sensors of HMC1001, a Wheatstone bridge formed by four resistors is arranged inside the first AMR chip sensor and the second AMR chip sensor, and the measured magnetic field value is converted into differential voltage.
The rear-end signal conditioning circuit module comprises a preamplifier module, a differential amplifier module, a synchronous detection module, an integration module, a V/I conversion circuit and a low-pass filter; the preamplifier module is connected with the differential amplifier module, the differential amplifier module is connected with the synchronous detection module, the synchronous detection module is connected with the integration module, the integration module is respectively connected with the V/I conversion circuit and the low-pass filter, and the V/I conversion circuit is connected with the second AMR chip sensor.
The preamplifier module comprises a first preamplifier and a second preamplifier, the first preamplifier is connected with the first AMR chip sensor, and an output voltage signal of the first AMR chip sensor is amplified; the second preamplifier is connected with the second AMR chip sensor and amplifies an output voltage signal of the second AMR chip sensor.
The first preamplifier and the second preamplifier are both connected with a differential amplifier module, and the differential amplifier module performs differential amplification on the voltage signals output by the first preamplifier and the second preamplifier and outputs differential alternating voltage signals.
The output end of the differential amplifier module is connected to the input end of the synchronous detection module, and the synchronous detection module carries out synchronous detection on the differential voltage signal output by the differential amplifier module and outputs a detected direct-current voltage signal.
The synchronous detection circuit also comprises a synchronous clock module, wherein the synchronous clock module ensures that the synchronous detection module is completely synchronous with the setting/resetting circuit, and the first AMR chip sensor and the second AMR chip sensor output alternating voltage signals under the action of the setting/resetting circuit.
The output end of the synchronous detection module is connected to the input end of the integration module, and the integration module integrates the voltage signal output by the synchronous detection and outputs the integrated voltage after integration.
The output end of the integration module is connected to the input end of the V/I conversion circuit, the integration voltage output by the integration module is input into the V/I conversion circuit, and the V/I conversion circuit outputs feedback current to a bias current band in the second AMR chip sensor; the bias current band can generate a feedback magnetic field which is opposite to the measuring magnetic field at the second AMR chip sensor, under the action of a combined magnetic field of the measuring magnetic field and the feedback magnetic field, the second AMR chip sensor outputs a new alternating current voltage signal, the output of the first AMR chip sensor is kept unchanged, the output of the second AMR chip sensor is gradually reduced, the output of the differential amplifier module is gradually reduced, and then the output current of the V/I conversion circuit is gradually reduced until the combined magnetic field of the feedback magnetic field generated by the bias current band in the second AMR chip sensor and the measuring magnetic field at the second AMR chip sensor is equal to the magnitude of the measuring magnetic field at the first AMR chip sensor, at the moment, the circuit reaches a stable state, the output of the differential amplifier module is 0, the output of the integral module is not increased any more, but is kept unchanged, and the magnitude of the output integral voltage is in direct proportion to the gradient of the measuring magnetic field.
The output end of the integration module is connected to the input end of the low-pass filter, the low-pass filter filters the voltage signal output by the integration module, and the voltage signal output by the low-pass filter is the output voltage of the gradiometer.
A magnetic field gradient measuring method of an AMR vector magnetic gradiometer,
placing the AMR vector magnetic gradiometer into a measuring magnetic field, and if the magnetic field at the first AMR chip sensor is B 1 The magnitude of the magnetic field at the second AMR chip sensor is B 2 The magnetic field gradient T at the measurement is expressed as:
in the formula: d is the baseline distance of the gradiometer; delta B is the magnitude of the magnetic field B at the first AMR chip sensor 1 And the magnitude of the magnetic field at the second AMR chip sensor B 2 The difference of (a).
When the sensitivity of the AMR chip sensor HMC1001 is 3.2mV/V/Gs and the bridge voltage is 5V, the output sensitivity coefficient is S n =16mV/Gs; output V of the differential amplifier c Comprises the following steps:
V c ＝k 3 (k 1 S n B 1 -k 2 S n B 2 )；
in the formula: k is a radical of 1 And k 2 Amplification factor, k, of the first preamplifier and the second preamplifier, respectively 3 Is the amplification of the differential amplifier. The feedback current formula output by the V/I conversion circuit is I = V d R, wherein: and R is a feedback resistor in the V/I conversion circuit.
The relation between the bias current band feedback magnetic field and the feedback current of the AMR chip sensor is B I K =51mA/GS, is a biasThe coil constant of the current strip is set.
When the circuit is balanced, the output of the differential amplifier is 0, and at this time,
wherein: v c Is the output voltage of the differential amplifier.
If the amplification factor k of the first preamplifier and the second preamplifier is satisfied 1 And k 2 Equal in size, and the integral voltage V can be obtained by the above formula d The relationship with Δ B is:
will be provided with
Substituting can obtain T = V d /kRd。
The invention discloses an AMR vector magnetic gradiometer, which has the following technical effects:
1) The magnetic gradiometer has the advantages of high sensitivity and small volume, and the AMR gradiometer is easy to integrate and can be manufactured in batches.
2) The magnetic gradiometer of the invention uses a plate-level structure, and the AMR gradiometer carries out internal difference on an AMR chip sensor and directly outputs a voltage signal which is in direct proportion to the magnetic field gradient, so that the problem of consistency is not existed.
3) The magnetic gradiometer of the invention is adopted to carry out magnetic field gradient measurement, can effectively inhibit the interference of environmental magnetic noise, can carry out weak magnetic field measurement under the non-shielding condition, and has lower manufacturing cost.
4) The gradient sensitivity of the AMR gradiometer can be adjusted, and the gradient sensitivity of the AMR gradiometer can be adjusted according to different measuring objects.
5) The front-end gradient measuring probe and the rear-end signal conditioning PCB of the AMR vector magnetic gradiometer can be flexibly connected and separated.
Drawings
FIG. 1 is a schematic diagram of the overall structure of an AMR vector magnetic gradiometer of the present invention.
FIG. 2 is a circuit diagram of an AMR vector magnetic gradiometer of the present invention.
Fig. 3 is a schematic diagram of the synchronous clock module providing clock signals for the set/reset circuit and the synchronous detection circuit.
Detailed Description
As shown in fig. 1, an AMR vector magnetic gradiometer comprises:
the front end magnetic field gradient measuring probe a comprises a first AMR chip sensor 1 and a second AMR chip sensor 2,
the front end magnetic field gradient measuring probe a is used for converting the magnetic field into a voltage signal and outputting the voltage signal;
the front-end magnetic field gradient measuring probe a is connected with the rear-end signal conditioning circuit module b, and the rear-end signal conditioning circuit module b is used for outputting a voltage signal in direct proportion to the magnetic field gradient.
As shown in fig. 2, the back-end signal conditioning circuit module b includes a preamplifier module, a differential amplifier module 5, a synchronous detection module 6, a synchronous clock module 12, an integration module 7, a V/I conversion circuit 9, and a low-pass filter 8;
the first AMR chip sensor 1 and the second AMR chip sensor 2 are welded at two ends of a PCB of the probe, the distance d between base lines is 10cm, and the welding direction of the first AMR chip sensor and the welding direction of the second AMR chip sensor are consistent with the direction of a measured magnetic field, namely the direction of the gradient of the measured magnetic field is consistent with the direction of the base lines.
The first AMR chip sensor and the second AMR chip sensor are single-axis magnetoresistive sensors with the model of HMC1001, a Wheatstone bridge formed by four resistors is arranged inside the single-axis magnetoresistive sensors, and the measured magnetic field values are converted into differential voltage. The chip type sensor has the characteristics of small volume, high sensitivity and low cost.
The preamplifier module comprises a first preamplifier 3 and a second preamplifier 4, the first preamplifier 3 is connected with the first AMR chip sensor 1, and an output voltage signal of the first AMR chip sensor 1 is amplified; the second preamplifier 4 is connected to the second AMR chip sensor 2, and amplifies an output voltage signal of the second AMR chip sensor 2.
The first preamplifier 3 and the second preamplifier 4 are differential amplifier chips of type AD 620.
The output ends of the first preamplifier 3 and the second preamplifier 4 are connected to the input end of a differential amplifier module 5, and the differential amplifier module 5 differentially amplifies the voltage signals output by the first preamplifier 3 and the second preamplifier 4 and outputs a differential alternating voltage signal.
The differential amplifier module 5 is a differential amplifier chip with model number AD 620.
The output end of the differential amplifier module 5 is connected to the input end of the synchronous detection module 6, and the synchronous detection module 6 performs synchronous detection on the differential voltage signal output by the differential amplifier module 5 and outputs a detected direct-current voltage signal.
The synchronous detection module 6 is composed of a chip ADG436, and two independent and selectable dual-channel single-pole double-throw switches are arranged in the synchronous detection module.
The first AMR chip sensor and the second AMR chip sensor both comprise an S/R coil 10, a synchronous clock module 12 ensures that a synchronous detection module 6 is completely synchronous with a setting/resetting circuit 11, and under the action of the setting/resetting circuit 11, the first AMR chip sensor 1 and the second AMR chip sensor 2 output alternating voltage signals. As shown in fig. 3, the synchronous clock module 12 provides a synchronous clock signal for the set/reset circuit 11 and the switch synchronous detector circuit. The synchronous clock module 12 is composed of a DS1302 clock chip and a crystal oscillator, and the set/reset circuit 11 is composed of a chip TC 1428.
The output end of the synchronous detection module 6 is connected to the input end of the integration module 7, and the integration module 7 integrates the voltage signal output by synchronous detection and outputs the integrated voltage after integration.
The integration module 7 employs a chip OP4177.
The output end of the integration module 7 is connected to the input end of the V/I conversion circuit 9, the integration voltage output by the integration module 7 is input to the V/I conversion circuit 9,V/I conversion circuit 9 to output the feedback current to the bias current band in the second AMR chip sensor 2; the bias current band can generate a feedback magnetic field which is opposite to the measuring magnetic field at the second AMR chip sensor 2, under the action of a combined magnetic field of the measuring magnetic field and the feedback magnetic field, the second AMR chip sensor 2 outputs a new alternating current voltage signal, the output of the first AMR chip sensor 1 is kept unchanged, the output of the second AMR chip sensor 2 is gradually reduced, the output of the differential amplifier module 5 is gradually reduced, and then the output current of the V/I switching circuit 9 is gradually reduced until the combined magnetic field of the feedback magnetic field generated by the bias current band in the second AMR chip sensor 2 and the measuring magnetic field at the second AMR chip sensor 2 is equal to the measuring magnetic field at the first AMR chip sensor 1, at the moment, the circuit reaches a stable state, the output of the differential amplifier module 5 is 0, the output of the integrating module 7 is not increased any more, but is kept unchanged, and the output integrated voltage is in direct proportion to the measuring magnetic field gradient.
The V/I conversion circuit 9 includes two OP4177 chips.
The output end of the integration module 7 is connected to the input end of the low-pass filter 8, the low-pass filter 8 filters the voltage signal output by the integration module 7, and the voltage signal output by the low-pass filter 8 is the output voltage of the gradiometer.
The low-pass filter 8 is a second-order low-pass filter circuit formed by a chip OP27 GS.
Based on the magnetic field gradient measuring method of the AMR vector magnetic gradiometer,
the AMR vector magnetic gradiometer is placed in a measuring magnetic field, and if the magnetic field at the first AMR chip sensor 1 is B 1 The magnitude of the magnetic field at the second AMR chip sensor 2 is B 2 The magnetic field gradient T at the measurement is expressed as:
in the formula: d is the baseline distance of the gradiometer; delta B is the magnitude B of the magnetic field at the first AMR chip sensor 1 1 And the magnitude of the magnetic field B at the second AMR chip sensor 2 2 The difference of (a).
When the sensitivity of the AMR chip sensor HMC1001 is 3.2mV/V/Gs and the bridge voltage is 5V, the output sensitivity coefficient is S n =16mV/Gs; differential amplificationOutput V of the device c Comprises the following steps:
V c ＝k 3 (k 1 S n B 1 -k 2 S n B 2 )，
in the formula: k is a radical of 1 And k 2 Amplification factor, k, of the first preamplifier 3 and the second preamplifier 4, respectively 3 Is the amplification of the differential amplifier.
The feedback current output from the V/I conversion circuit 9 has the formula I = V d R, wherein: r is a feedback resistor in the V/I conversion circuit;
the relation between the bias current band feedback magnetic field and the feedback current of the AMR chip sensor is B I And k =51mA/GS, which is a coil constant of the bias current band.
When the circuit is balanced, the output of the differential amplifier is 0, and at this time,
If the amplification factor k of the first preamplifier 3 and the second preamplifier 4 is satisfied 1 And k 2 Equal in size, and the integral voltage V can be obtained from the above formula d The relationship with Δ B is:
will be provided with
Substituting can obtain T = V d /kRd。
Claims (10)
1. An AMR vector magnetic gradiometer, comprising:
the front end magnetic field gradient measuring probe (a) comprises a first AMR chip sensor (1) and a second AMR chip sensor (2),
the front end magnetic field gradient measuring probe (a) is used for converting the magnetic field size into a voltage signal and outputting the voltage signal;
the front-end magnetic field gradient measuring probe (a) is connected with the rear-end signal conditioning circuit module (b) which is used for outputting a voltage signal in direct proportion to the magnetic field gradient.
2. An AMR vector magnetic gradiometer according to claim 1, wherein: the first AMR chip sensor (1) and the second AMR chip sensor (2) are welded at two ends of a PCB of the probe, the distance of a base line is d, and the welding direction of the first AMR chip sensor and the welding direction of the second AMR chip sensor are consistent with the direction of a measured magnetic field, namely the direction of the gradient of the measured magnetic field is consistent with the direction of the base line.
3. An AMR vector magnetic gradiometer according to claim 1, wherein: the rear-end signal conditioning circuit module (b) comprises a preamplifier module, a differential amplifier module (5), a synchronous detection module (6), an integration module (7), a V/I conversion circuit (9) and a low-pass filter (8);
the preamplifier module is connected with the differential amplifier module (5), the differential amplifier module (5) is connected with the synchronous detection module (6), the synchronous detection module (6) is connected with the integration module (7), the integration module (7) is respectively connected with the V/I conversion circuit (9) and the low-pass filter (8), and the V/I conversion circuit (9) is connected with the second AMR chip sensor (2).
4. An AMR vector magnetic gradiometer according to claim 3, wherein: the preamplifier module comprises a first preamplifier (3) and a second preamplifier (4),
the first preamplifier (3) is connected with the first AMR chip sensor (1) and amplifies an output voltage signal of the first AMR chip sensor (1);
the second preamplifier (4) is connected with the second AMR chip sensor (2) and amplifies the output voltage signal of the second AMR chip sensor (2).
5. An AMR vector magnetic gradiometer according to claim 4 wherein: the first preamplifier (3) and the second preamplifier (4) are both connected with a differential amplifier module (5), and the differential amplifier module (5) differentially amplifies voltage signals output by the first preamplifier (3) and the second preamplifier (4) and outputs a differential alternating voltage signal.
6. An AMR vector magnetic gradiometer according to claim 3, wherein: the output end of the differential amplifier module (5) is connected to the input end of the synchronous detection module (6), and the synchronous detection module (6) synchronously detects the differential voltage signal output by the differential amplifier module (5) and outputs a detected direct-current voltage signal.
7. An AMR vector magnetic gradiometer according to claim 3, wherein: the sensor is characterized by further comprising a synchronous clock module (12), wherein the synchronous clock module (12) ensures that the synchronous detection module (6) is completely synchronous with the setting/resetting circuit (11), and under the action of the setting/resetting circuit (11), the first AMR chip sensor (1) and the second AMR chip sensor (2) output alternating-current voltage signals.
8. An AMR vector magnetic gradiometer according to claim 3, characterised in that: the output end of the synchronous detection module (6) is connected to the input end of the integration module (7), the integration module (7) integrates the voltage signal output by synchronous detection and outputs the integrated voltage after integration;
the output end of the integration module (7) is connected to the input end of the V/I conversion circuit (9), the integration voltage output by the integration module (7) is input into the V/I conversion circuit (9), and the V/I conversion circuit (9) outputs a feedback current to a bias current band in the second AMR chip sensor (2); the bias current band can generate a feedback magnetic field which is opposite to the measuring magnetic field at the second AMR chip sensor (2), under the action of a composite magnetic field of the measuring magnetic field and the feedback magnetic field, the second AMR chip sensor (2) outputs a new alternating current voltage signal, the output of the first AMR chip sensor (1) is kept unchanged, the output of the second AMR chip sensor (2) is gradually reduced, the output of the differential amplifier module (5) is gradually reduced, further, the output current of the V/I conversion circuit (9) is gradually reduced until the combined magnetic field of the feedback magnetic field generated by the bias current band in the second AMR chip sensor (2) and the measuring magnetic field at the second AMR chip sensor (2) is equal to the size of the measuring magnetic field at the first AMR chip sensor (1), at the moment, the circuit reaches a stable state, the output of the differential amplifier module (5) is 0, the output of the integrating module (7) is not increased any more but is kept unchanged, and the size of the output integrated voltage is in a direct proportion relation with the gradient of the measuring magnetic field.
9. An AMR vector magnetic gradiometer according to claim 3, wherein: the output end of the integration module (7) is connected to the input end of the low-pass filter (8), the low-pass filter (8) filters the voltage signal output by the integration module (7), and the voltage signal output by the low-pass filter (8) is the output voltage of the gradiometer.
10. A method of measuring magnetic field gradients using an AMR vector magnetic gradiometer according to any of claims 1 to 9,
placing the AMR vector magnetic gradiometer into a measuring magnetic field, if the magnetic field at the first AMR chip sensor (1) is B 1 The magnitude of the magnetic field at the second AMR chip sensor (2) is B 2 The magnetic field gradient T at the measurement is expressed as:
in the formula: d is the baseline distance of the gradiometer; delta B is the magnitude B of the magnetic field at the first AMR chip sensor (1) 1 And the magnitude of the magnetic field B at the second AMR chip sensor (2) 2 A difference of (d);
output V of the differential amplifier c Comprises the following steps:
V c ＝k 3 (k 1 S n B 1 -k 2 S n B 2 )；
in the formula: k is a radical of 1 And k 2 The amplification factor, k, of the first preamplifier (3) and the second preamplifier (4) respectively 3 Is the amplification factor of the differential amplifier;
the feedback current formula output by the V/I conversion circuit (9) is I = V d R, wherein: r is feedback electricity in V/I conversion circuitBlocking;
the relation between the bias current band feedback magnetic field and the feedback current of the AMR chip sensor is B I K is the coil constant of the bias current band;
when the circuit is balanced, the output of the differential amplifier is 0, and at this time,
wherein: v c Is the output voltage of the differential amplifier;
if the amplification factor k of the first preamplifier (3) and the second preamplifier (4) is satisfied 1 And k 2 Equal in size, and the integral voltage V can be obtained by the above formula d The relationship with Δ B is:
will be provided with
Substituting can obtain T = V d kRd。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210866816.7A CN115327449A (en) | 2022-07-22 | 2022-07-22 | AMR vector magnetic gradiometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210866816.7A CN115327449A (en) | 2022-07-22 | 2022-07-22 | AMR vector magnetic gradiometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115327449A true CN115327449A (en) | 2022-11-11 |
Family
ID=83919676
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210866816.7A Pending CN115327449A (en) | 2022-07-22 | 2022-07-22 | AMR vector magnetic gradiometer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115327449A (en) |
-
2022
- 2022-07-22 CN CN202210866816.7A patent/CN115327449A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105022005B (en) | A kind of method, apparatus and system of raising SQUID Magnetic Sensor measurement sensitivities | |
| US11187729B2 (en) | Current sensor chip with magnetic field sensor | |
| US9341686B2 (en) | Single-package power meter | |
| EP3006896B1 (en) | Three-axis digital compass | |
| US9182457B2 (en) | Isolated voltage transducer | |
| CN209432986U (en) | Vector closed loop compensation formula triaxial magnetic field sensor probe based on Helmholtz coil | |
| CN210222235U (en) | Magnetic sensor's test system | |
| CN104793151B (en) | The magnetic field measuring device and measuring method of a kind of magnetic element | |
| CN101893722A (en) | Giant magneto-resistance sensor-based geomagnetic roll angle measurement system and method | |
| US4492923A (en) | Apparatus for measuring the spatial scalar variation of a magnetic field with vector magnetic sensors on a moderately stable moving platform | |
| CN112595873A (en) | Current sensor based on triaxial tunnel magnetoresistive array and measuring method thereof | |
| CN113267741B (en) | SQUID test component crosstalk calibration and elimination method and system | |
| CN109709500A (en) | Low-intensity magnetic field signal acquisition circuit | |
| US7417424B2 (en) | Magnetic-field-measuring device | |
| CN102520375B (en) | Fluxgate magnetometer detection circuit and method for improving accuracy thereof | |
| CN115327449A (en) | AMR vector magnetic gradiometer | |
| CN104730473B (en) | Absolute geomagnetic field measuring apparatus and the Absolute geomagnetic field measuring method being applicable | |
| CN109298455A (en) | The three axis TMR magnetometers applied to unmanned plane aeromagnetic detection platform | |
| JPH05232202A (en) | Software gradiometer | |
| CN109283476A (en) | The low frequency intrinsic noise test macro and test method of Magnetic Sensor | |
| CN219302641U (en) | Vector alternating current magnetometer and spacecraft | |
| CN216310100U (en) | Closed-loop current sensor with magnetic shunt structure | |
| Riveros et al. | High sensitivity GMI gradiometer with an active interference compensation system | |
| CN117572061B (en) | Electric signal acquisition assembly, current detection method and electric energy meter | |
| KR102254136B1 (en) | Detector for Small Metal Object Including Geomagnetic Sensors |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |