CN117706167A - Weak alternating current measuring device based on nuclear magnetic resonance - Google Patents
Weak alternating current measuring device based on nuclear magnetic resonance Download PDFInfo
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- CN117706167A CN117706167A CN202311734277.2A CN202311734277A CN117706167A CN 117706167 A CN117706167 A CN 117706167A CN 202311734277 A CN202311734277 A CN 202311734277A CN 117706167 A CN117706167 A CN 117706167A
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- 238000005481 NMR spectroscopy Methods 0.000 title claims abstract description 21
- 238000005259 measurement Methods 0.000 claims abstract description 43
- 230000007704 transition Effects 0.000 claims abstract description 8
- 238000005086 pumping Methods 0.000 claims description 34
- 238000001514 detection method Methods 0.000 claims description 32
- 230000005284 excitation Effects 0.000 claims description 14
- 229910052783 alkali metal Inorganic materials 0.000 claims description 10
- 150000001340 alkali metals Chemical class 0.000 claims description 10
- 230000010287 polarization Effects 0.000 claims description 10
- 238000005555 metalworking Methods 0.000 claims description 7
- 229910052700 potassium Inorganic materials 0.000 claims description 7
- 230000006698 induction Effects 0.000 claims description 6
- 239000000523 sample Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 3
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000005388 borosilicate glass Substances 0.000 claims description 3
- 229910052792 caesium Inorganic materials 0.000 claims description 3
- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical compound [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 239000011591 potassium Substances 0.000 claims description 3
- 229910052701 rubidium Inorganic materials 0.000 claims description 3
- IGLNJRXAVVLDKE-UHFFFAOYSA-N rubidium atom Chemical compound [Rb] IGLNJRXAVVLDKE-UHFFFAOYSA-N 0.000 claims description 3
- 239000004065 semiconductor Substances 0.000 claims description 3
- 229910052708 sodium Inorganic materials 0.000 claims description 3
- 239000011734 sodium Substances 0.000 claims description 3
- 239000010409 thin film Substances 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 2
- 230000035699 permeability Effects 0.000 claims 1
- 230000001502 supplementing effect Effects 0.000 claims 1
- 239000007789 gas Substances 0.000 description 18
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- IGLNJRXAVVLDKE-NJFSPNSNSA-N Rubidium-87 Chemical compound [87Rb] IGLNJRXAVVLDKE-NJFSPNSNSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 229910001004 magnetic alloy Inorganic materials 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 229910001281 superconducting alloy Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
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- Measuring Magnetic Variables (AREA)
Abstract
The invention belongs to the technical field of weak alternating current precise measurement, and discloses a weak alternating current measurement device based on nuclear magnetic resonance. Based on nuclear magnetic resonance principle, weak alternating current is related to atomic transition frequency, weak current measurement is converted into high-precision frequency measurement, and measurement precision and measurement linearity of weak current can be remarkably improved.
Description
Technical Field
The invention belongs to the technical field of weak current precision measurement, and relates to a weak alternating current measurement device based on nuclear magnetic resonance.
Background
The accurate measurement of weak current is an important technology in modern electronics technology, and the technology has corresponding application in analytical chemistry, biomedicine, photoelectric detection, petroleum well logging, high-precision sensors, nuclear electronics and other subjects. The traditional current sensor such as the traditional rogowski coil current sensor or the traditional hall current sensor has the problems of low sensitivity and poor linearity, and the requirements of the prior art are difficult to meet.
Disclosure of Invention
The purpose of the invention is that: the weak alternating current measuring device based on nuclear magnetic resonance is provided, weak current is related to atomic transition frequency based on nuclear magnetic resonance principle, weak current measurement is converted into high-precision frequency measurement, and measurement precision and measurement linearity of the weak current can be remarkably improved
The technical scheme of the invention is as follows: the weak alternating current precise measurement device based on nuclear magnetic resonance comprises an excitation coil 1, an air chamber 2, an excitation coil 3, a compensation coil 4, a pumping light source 5, a detection light source 6, a differential detector 7 and a shielding cover 8; the axes of the exciting coil 1 and the exciting coil 3 are orthogonal to each other; the air chamber 2 is positioned at the axial intersection point of the exciting coil 1 and the exciting coil 3; the compensation coil 4 is coaxial with the excitation coil 1; both the pumping light 9 generated by the pumping light source 5 and the detection light 10 generated by the detection light source 6 pass through the air chamber 2; when passing through the air chamber 2, the axes of the pumping light 9 and the detection light 10 are orthogonal to each other, the pumping light 9 coincides with the axis of the exciting coil 1, and the detection light 10 can coincide with the axis of the exciting coil 3 or be orthogonal to the axis of the exciting coil 3; the detection light 10 passes through the air chamber 2 and then reaches the differential detector 7; the exciting coil 1, the air chamber 2, the exciting coil 3 and the compensating coil 4 are all arranged in the shielding cover 8; the pumping light source 5, the detecting light source 6, and the differential detector 7 may be located entirely inside the shielding case 8, or entirely or partially outside the shielding case 8.
The exciting coil 1 is a Helmholtz coil or a solenoid or a combination of the Helmholtz coil and the solenoid, and is used for generating a stable and uniform working magnetic field along the axial direction of the coil by passing working current; an external ac current signal to be measured is applied to the excitation coil 1.
Optionally, the coil coefficient of the exciting coil 1 is K, k=b/I, wherein B is the magnetic induction intensity of the magnetic field generated by the exciting coil 1, and I is the current loaded on the exciting coil 1; the coil coefficient K can be obtained through theoretical calculation, and can also be generated through calibration of an external instrument.
Optionally, the alternating current amplitude to be measured is generally not more than 0.03/K, unit mA, to avoid de-resonating the device.
The air chamber 2 is a hollow cube and is made of high borosilicate glass or quartz glass, working gas is filled in the air chamber, and the air chamber is steam of alkali metal rubidium or cesium or potassium or sodium, and the air pressure is from 0.1torr to 100torr; the gas chamber may also be filled with other auxiliary gases, such as nitrogen or inert gases.
The exciting coil 3 is a Helmholtz coil or a solenoid or a combination of the two, and is used for generating a transverse alternating uniform magnetic field to drive the magnetic moment of the working gas to resonate, and the driving current frequency omega is approximately equal to gamma B 0 Wherein gamma is gyromagnetic ratio of alkali metal working atoms, B 0 Is the magnetic induction intensity of the working magnetic field.
Alternatively, the exciting coil 1 and the exciting coil 3 may be wound by using wires or welded by using thin film cables.
The compensation coil 4 is a helmholtz coil and is used for compensating a longitudinal magnetic field so as to keep a working magnetic field stable and prevent the device from being separated from a resonance region due to the impact of an external magnetic field.
Alternatively, the function of the compensation coil 4 may be directly replaced by the excitation coil 1, and the compensation current may be directly applied to the excitation coil 1.
The pumping light source 5 and the detecting light source 6 are semiconductor lasers, and the laser frequency is adapted to the transition frequency of the alkali metal working atoms.
The differential detector 7 comprises a polarization beam splitter 11 and two photodetectors 12, wherein the polarization beam splitter is used for splitting the detection light 10 according to the polarization direction, and the two photodetectors 12 are used for respectively detecting the light intensities of different polarized lights.
The shielding cover 8 is a cylinder or a cuboid, and is generally 2-5 layers, and is made of high-permeability materials, such as soft magnetic alloy or superconducting alloy, and has a shielding coefficient of 10 5 ～10 6 The method comprises the steps of carrying out a first treatment on the surface of the The shield case 8 is provided with a light-passing hole 13 and a light-passing hole 14 for passing the pumping light 9 and the probe light 10, respectively.
Alternatively, the light-passing holes 13 and 14 may be single holes or a series of holes, depending on the actual light paths of the pumping light and the probe light.
The pumping light 9 is generated by the pumping light source 5 and is left circularly polarized light or right circularly polarized light, enters the innermost shielding cover through the light through holes 13 on the shielding cover 8, and propagates along the axis of the exciting coil 1to reach the air chamber 2; after passing through the air chamber 2, the air can be blocked by the shielding cover 8 or the beam stopper, and can also pass out of the shielding cover 8.
The detection light 10 is generated by the detection light source 6, enters the innermost shielding cover through the light through holes 14 on the shielding cover 8, and propagates through the air chamber 2 along the axis of the exciting coil 3 or the axis of the exciting coil 3 and the axis of the exciting coil 1 in the direction orthogonal to each other; through the plenum 2 and then to the differential detector 7.
The invention has the advantages that: the weak alternating current precise measurement device is provided, weak current is related to atomic transition frequency based on nuclear magnetic resonance principle, weak current measurement is converted into high-precision frequency measurement, and measurement precision and measurement linearity of the weak current can be remarkably improved; according to one embodiment of the invention, experiments prove that the measurement resolution of the weak alternating current precise measurement device reaches 10nA, and the linearity reaches 0.003%.
Drawings
FIG. 1 is a schematic diagram of a weak alternating current measurement device of the present invention;
FIG. 2 is a schematic view of the optical path of the weak AC measuring device of the present invention;
FIG. 3 is a schematic diagram of a differential detector of the weak AC measuring device of the present invention;
fig. 4 is a schematic view of a weak ac current measurement device shield of the present invention.
Detailed Description
The traditional rogowski coil current sensor or the Hall current sensor has the problems of low sensitivity and poor linearity, and the traditional rogowski coil current sensor or the Hall current sensor has hardly satisfied the development requirement of the prior art. The invention provides a weak alternating current precise measurement device, which is based on nuclear magnetic resonance principle, and is characterized in that weak current is related to atomic transition frequency, and weak current measurement is converted into high-precision frequency measurement, so that the measurement precision and measurement linearity of the weak current can be remarkably improved
Please refer to fig. 1, wherein fig. 1 is a weak ac current measuring device. The device comprises an excitation coil 1, an air chamber 2, an excitation coil 3, a compensation coil 4, a pumping light source 5, a detection light source 6, a differential detector 7 and a shielding cover 8; the axes of the exciting coil 1 and the exciting coil 3 are orthogonal to each other; the air chamber 2 is positioned at the axial intersection point of the exciting coil 1 and the exciting coil 3; the compensation coil 4 is coaxial with the excitation coil 1; the exciting coil 1, the air chamber 2, the exciting coil 3 and the compensating coil 4 are all arranged in the shielding cover 8; the pumping light source 5, the detecting light source 6, and the differential detector 7 may be located entirely inside the shielding case 8, or entirely or partially outside the shielding case 8.
The exciting coil 1 is a Helmholtz coil or a solenoid or a combination of the Helmholtz coil and the solenoid, and a stable and uniform working magnetic field is generated along the axial direction of the coil by passing working current. The working magnetic field generally requires a much larger transverse stray field than the remainder of the shield to avoid the resultant magnetic field being pulled off by the transverse stray field. An external alternating current signal to be measured is loaded on the exciting coil 1, so that an alternating magnetic field with the same frequency as the signal to be measured is generated.
The coil coefficient of the exciting coil 1 is K, K=B/I, wherein B is the magnetic induction intensity of a magnetic field generated by the exciting coil 1, and I is the current loaded on the exciting coil 1; the coil coefficient K can be obtained through theoretical calculation, and can also be generated through calibration of an external instrument.
The amplitude of the alternating current to be measured is generally not more than 0.03/K, and is unit mA, so that the device is prevented from being off resonance.
The air chamber 2 is a hollow cube and is made of high borosilicate glass or quartz glass, working gas is filled in the air chamber, and the air chamber is steam of alkali metal rubidium or cesium or potassium or sodium, and the air pressure is from 0.1torr to 100torr; the gas chamber may also be filled with other auxiliary gases, such as nitrogen or inert gases. The alternating magnetic field converted by the alternating current signal to be detected can excite the Larmor precession frequency of the magnetic moment of the alkali metal working gas in the air chamber to periodically change along with the frequency of the alternating current signal.
The exciting coil 3 is a Helmholtz coil or a solenoid or a combination of the two, and is used for generating a transverse alternating uniform magnetic field to drive the magnetic moment of the working gas to resonate, and the driving current frequency omega is approximately equal to gamma B 0 Wherein gamma is gyromagnetic ratio of alkali metal working atoms, B 0 Is the magnetic induction intensity of the working magnetic field.
The exciting coil 1 and the exciting coil 3 can be formed by winding wires or welding thin film cables.
The compensation coil 4 is a helmholtz coil and is used for compensating a longitudinal magnetic field so as to keep a working magnetic field stable and prevent the device from being separated from a resonance region due to the impact of an external magnetic field.
The function of the compensation coil 4 can also be directly replaced by the excitation coil 1, and the compensation current can be directly applied to the excitation coil 1.
Referring to fig. 2, 3 and 4, fig. 2 is a schematic view of an optical path of the weak ac current measuring device, fig. 3 is a schematic view of a differential detector of the weak ac current measuring device, and fig. 4 is a schematic view of a shielding cover of the weak ac current measuring device. Both the pumping light 9 generated by the pumping light source 5 and the detection light 10 generated by the detection light source 6 pass through the air chamber 2; when passing through the air chamber 2, the axes of the pumping light 9 and the detection light 10 are orthogonal to each other, the pumping light 9 coincides with the axis of the exciting coil 1, and the detection light 10 can coincide with the axis of the exciting coil 3 or be orthogonal to the axis of the exciting coil 3; the detection light 10 passes through the gas cell 2 and reaches the differential detector 7.
The pumping light source 5 and the detecting light source 6 are semiconductor lasers, and the laser frequency is adapted to the transition frequency of the alkali metal working atoms.
The differential detector 7 comprises a polarization beam splitter 11 and two photodetectors 12, wherein the polarization beam splitter is used for splitting the detection light 10 according to the polarization direction, and the two photodetectors 12 are used for respectively detecting the light intensities of different polarized lights.
The shielding cover 8 is a cylinder or a cuboid, and is generally 2-5 layers, and is made of high-permeability materials, such as soft magnetic alloy or superconducting alloy, and has a shielding coefficient of 10 4 ～10 6 The method comprises the steps of carrying out a first treatment on the surface of the The shield case 8 is provided with a light-passing hole 13 and a light-passing hole 14 for passing the pumping light 9 and the probe light 10, respectively.
The light-passing holes 13 and 14 may be single holes or a series of holes, depending on the actual light paths of the pumping light and the detection light.
The pumping light 9 is generated by the pumping light source 5 and is left circularly polarized light or right circularly polarized light, enters the innermost shielding cover through the light through holes 13 on the shielding cover 8, and propagates along the axis of the exciting coil 1to reach the air chamber 2; after passing through the air chamber 2, the air can be blocked by the shielding cover 8 or the beam stopper, and can also pass out of the shielding cover 8.
The detection light 10 is generated by the detection light source 6, enters the innermost shielding case through the light through holes 14 on the shielding case 8, and propagates through the air chamber 2 along the axis of the exciting coil 3 or the axis of the exciting coil 3 and the axis of the exciting coil 1 in the direction orthogonal to each other. The probe light passing through the gas cell 2 is affected by the working gas in the gas cell, and its polarization plane is periodically changed at the larmor precession frequency of the working gas. After passing through the gas cell 2, the gas reaches a differential detector 7, by means of which the larmor precession frequency of the working gas can be read out.
Description of the preferred embodiments
In the embodiment, a pumping light source is a DBR laser with the wavelength of 795nm and the power of 300mW, a quarter wave plate is used for adjusting the polarization of a light beam to left-handed circularly polarized light, and a lens group is used for expanding the light beam to 5mm; the detection light source is a DBR laser with the wavelength of 780nm and the power of 300mW, the half wave plate is used for adjusting the polarization of the light beam to linearly polarized light, and the lens group is used for expanding the light beam to 3mm. The pumping light irradiates directly and passes through the air cell from the longitudinal direction, and the detection light passes through the air cell from the transverse direction through the mirror group and finally reaches the differential detector. 5X 5mm 3 The gas chamber was filled with 100torr of rubidium 87 atomic vapor and 10torr of nitrogen and heated to 100 ℃ using a magneto-less electric heating device. The exciting coil adopts a 20-turn loose winding solenoid with the coil coefficient of 7.5 multiplied by 10 -4 T/A, measuring range is 40mA. The exciting coil drives a current of 7kHz corresponding to the resonance frequency of rubidium 87. The device does not separately set a compensation coil, and compensates the stray magnetic field by reversely adding current to the exciting coil. The shielding cover adopts a double-layer shielding cover, and the shielding coefficient reaches 10000.
Effect of the invention
In this embodiment, the range of the weak ac precise measuring device is 40mA, the measuring resolution is 10nA, and the linearity is 0.003%. Can meet the corresponding application requirements in the disciplines of analytical chemistry, biomedicine, photoelectric detection, petroleum logging, high-precision sensor, nuclear electronics and the like.
The invention has the advantages that: the weak alternating current precise measurement device is based on the nuclear magnetic resonance principle, and is capable of connecting weak current with atomic transition frequency, converting weak current measurement into high-precision frequency measurement, and remarkably improving measurement precision and measurement linearity of the weak current.
Claims (10)
1. The weak alternating current measuring device based on nuclear magnetic resonance is characterized by comprising an excitation coil (1), an air chamber (2), an excitation coil (3), a compensation coil (4), a pumping light source (5), a detection light source (6), a differential detector (7) and a shielding cover (8); the axes of the exciting coil (1) and the exciting coil (3) are orthogonal to each other; the air chamber (2) is positioned at the axial intersection point of the exciting coil (1) and the exciting coil (3); the compensation coil (4) is coaxial with the excitation coil (1); the pumping light (9) generated by the pumping light source (5) and the detection light (10) generated by the detection light source (6) pass through the air chamber (2); when the air chamber (2) is passed, the axes of the pumping light (9) and the detection light (10) are orthogonal to each other, the pumping light (9) is overlapped with the axis of the exciting coil (1), and the detection light (10) can be overlapped with the axis of the exciting coil (3) or orthogonal to the axis of the exciting coil (3); the detection light (10) passes through the air chamber (2) and then reaches the differential detector (7); the exciting coil (1), the air chamber (2), the exciting coil (3) and the compensating coil (4) are all arranged in the shielding cover (8); the pumping light source (5), the detection light source (6) and the differential detector (7) can be located in the shielding cover (8) completely or partially outside the shielding cover (8).
2. The weak ac current measurement device based on nuclear magnetic resonance according to claim 1, characterized in that the exciting coil (1) is a helmholtz coil or a solenoid or a combination of both, and a stable and uniform working magnetic field is generated along the axial direction of the coil by passing a working current; an external alternating current signal to be measured is loaded on the exciting coil (1);
the coil coefficient of the exciting coil (1) is K, k=b/I, wherein B is the magnetic induction intensity of a magnetic field generated by the exciting coil (1), I is the current loaded on the exciting coil (1), and comprises: constant current working current I of exciting coil (1) 0 And weak alternating current to be measured; the coil coefficient K can be obtained through theoretical calculation and can also be generated through calibration of an external instrument;
the weak alternating current amplitude to be measured is not more than 0.03/K, and is unit mA.
3. The weak alternating current measurement device based on nuclear magnetic resonance according to claim 1, wherein the air chamber (2) is a hollow cube, the material is borosilicate glass or quartz glass, the air chamber is filled with working gas, and the air chamber is filled with steam of alkali metal rubidium or cesium or potassium or sodium, and the air pressure is from 0.1torr to 100torr.
4. The weak ac current measurement device based on nuclear magnetic resonance according to claim 1, characterized in that the exciting coil (3) is a helmholtz coil or a solenoid or a combination of both for generating a transverse ac uniform magnetic field driving the working gas magnetic moment resonance, driving current frequency ω = γb 0 Wherein gamma is gyromagnetic ratio of alkali metal working atoms, B 0 Is a constant current working current I 0 The magnetic induction intensity of the generated working magnetic field;
the exciting coil (1) and the exciting coil (3) are formed by winding wires or welding thin film cables.
5. The weak ac current measurement device based on nuclear magnetic resonance according to claim 1, characterized in that the compensation coil (4) is a helmholtz coil for compensating the longitudinal magnetic field to keep the working magnetic field stable and to avoid the device from leaving the resonance area due to the impact of external magnetic fields.
6. The weak alternating current measurement device based on nuclear magnetic resonance according to claim 1, characterized in that the pumping light source (5) and the detecting light source (6) are semiconductor lasers, and the laser frequency is adapted to the transition frequency of the alkali metal working atoms.
7. The weak alternating current measurement device based on nuclear magnetic resonance according to claim 1, characterized in that the differential detector (7) comprises a polarizing beam splitter (11) and two photodetectors (12), the polarizing beam splitter is used for splitting the detection light (10) according to the polarization direction, and the two photodetectors (12) respectively detect the light intensities of the different polarized lights. Supplementing the weak alternating current measurement principle.
8. Weak ac current measurement device based on nuclear magnetic resonance according to claim 1, characterized in that the shielding cover (8) is a cylinder or a cuboid, the material is a high permeability material, the shielding coefficient is 10 5 ～10 6 The method comprises the steps of carrying out a first treatment on the surface of the The shielding cover (8) is provided with a light-passing hole (13) and a light-passing hole (14) which are respectively used for passing the pumping light (9) and the detection light (10).
9. Weak alternating current measurement device based on nuclear magnetic resonance according to claim 1, characterized in that the pumping light (9) is generated by a pumping light source (5), is left-handed circularly polarized light or right-handed circularly polarized light, enters the innermost shield through a light passing hole (13) on the shield (8), propagates along the axis of the exciting coil (1) to the air chamber (2); after passing through the air chamber (2), the air chamber is blocked by the shielding cover (8) or the beam cut-off device, and can also pass out of the shielding cover (8).
10. The weak alternating current measurement device based on nuclear magnetic resonance according to claim 1, characterized in that the probe light (10) is generated by a probe light source (6), enters the innermost shielding case through a light passing hole (14) on the shielding case (8), and propagates through the air chamber (2) along the axis of the exciting coil (3) or the axis of the exciting coil (3) and the axis of the exciting coil (1) in the direction orthogonal at the same time; through the air chamber (2) and then to the differential detector (7).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311734277.2A CN117706167A (en) | 2023-12-15 | 2023-12-15 | Weak alternating current measuring device based on nuclear magnetic resonance |
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| CN202311734277.2A CN117706167A (en) | 2023-12-15 | 2023-12-15 | Weak alternating current measuring device based on nuclear magnetic resonance |
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