CN113687122A - Current metering device and method based on quantum natural reference - Google Patents
Current metering device and method based on quantum natural reference Download PDFInfo
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Abstract
The quantum natural reference-based current metering device and method disclosed by the invention comprise a magnetic field generation component to be measured, a pumping-detection type atomic magnetometer 3 and a quantum current measurement component; the magnetic field generating assembly to be detected comprises a magnetic shielding cylinder 1, a standard coil 2 and a current source 8; the magnetic shielding cylinder 1 is used for shielding a geomagnetic field, the standard coil 2 is axisymmetrically arranged in the magnetic shielding cylinder 1, and the current source 8 inputs current to the standard coil 2 to generate a magnetic field to be detected; the probe part of the pumping-detection type atomic magnetometer 3 is arranged at the geometric center of the standard coil 2 and is used for measuring a uniform magnetic field on the axis of the standard coil 2; the quantum current measurement assembly comprises a standard resistor 4 calibrated by a quantum resistor reference and a standard voltmeter 5 calibrated by a quantum voltage reference. Microamperes are realized based on the principle that the magnetic field value measured by the pumping-detection type atomic magnetometer 3 and the current value in the standard coil 2 are in a linear relation (10)‑6A) Metering of electric current over a wide range of ranges to amperes (A), whichThe coil coefficients of the medium standard coil 2 are traced to three quantum natural references, the josephson effect (voltage), the quantized hall effect (resistance) and the larmor precession effect (magnetic induction intensity).
Description
Technical Field
The invention belongs to the technical field of electromagnetism measurement, and particularly relates to a current measuring device and method based on quantum natural reference.
Background
Since the 20 th century, the discovery of the Josephson effect and the quantized Hall effect has promoted the establishment of quantum voltage references and quantum resistance references, and realized the transition of voltage and resistance from physical references to quantum natural references (reference: expecting electromagnetic metrology in the 21 st century [ J)]Zhangchuanhua, measurement and control technology, 2002, 21: 17-22). At present, the single electron tunneling effect is considered as a quantum natural reference which can possibly realize current, and the science and technology field has proposed the assumption of the electrical quantum triangle closed mutual authentication of quantum voltage, quantum resistance and quantum current. The current generated by single electron tunneling is only in pico amperes (10)-12A) On the order of magnitude, however, the small currents that are currently precisely measurable are at least up to microamperes (10)-6A) The difference of 6 orders of magnitude makes the practical application of single electron tunneling very difficult.
On the other hand, the larmor precession effect of atomic magnetic moments in a magnetic field is also a quantum natural reference, and atomic magnetometers with different principles are researched at home and abroad after the 21 st century. The method is characterized in that an atomic magnetometer is used for measuring a uniform magnetic field generated by a current-carrying standard coil, the measured magnetic field value and the current value in the standard coil are in a linear relation, the coil coefficient is traced to other quantum natural references, and a quantum reference device with practical current can be established in principle.
Disclosure of Invention
The invention overcomes one of the defects of the prior art and discloses a current metering device and a method based on quantum natural reference, wherein a pumping-detection type atomic magnetometer is used for measuring a uniform magnetic field generated by a current-carrying standard coil, the current metering is realized based on the principle that the magnetic field value measured by the pumping-detection type atomic magnetometer and the current value in the standard coil are in linear relation, and the coil coefficient of the standard coil is traced to three quantum natural references of a Josephson effect, a quantized Hall effect and a Larmor precession effect. The invention can calibrate microamperes (10)-6A) The constant current and noise in a wide range from ampere (A) have strong practicability.
According to an aspect of the present disclosure, the present invention provides a quantum natural reference based current metering device, the device comprising: a magnetic field generating component to be measured, a pumping-detection type atomic magnetometer 3 and a quantum current measuring component;
the magnetic field generating assembly to be detected comprises a magnetic shielding cylinder 1, a standard coil 2 and a current source 8; the magnetic shielding cylinder 1 is used for shielding a geomagnetic field, the standard coil 2 is axisymmetrically arranged in the magnetic shielding cylinder 1, and the current source 8 inputs current to the standard coil 2 to generate a magnetic field to be detected;
the probe part of the pumping-detection type atomic magnetometer 3 is arranged at the geometric center of the standard coil 2 and is used for measuring a uniform magnetic field on the axis of the standard coil 2;
the quantum current measuring component comprises a standard resistor 4 calibrated by a quantum resistor reference and a standard voltmeter 5 calibrated by a quantum voltage reference, and is used for calibrating the current output by the current source 8.
In one possible implementation, the magnetic shield cylinder 1 is cylindrical, the inner diameter of the cylinder is 500mm, and the length of the inner cylinder is greater than or equal to 700 mm.
In a possible implementation, the magnetic shielding cartridge 1 is replaced byThe magnetic shielding coefficient is less than 10-4The magnetic shield room of (1).
In a possible implementation, the pumping-detecting atomic magnetometer 3 is used to measure the magnitude and noise of a uniform magnetic field on the axis of the standard coil 2.
According to another aspect of the present disclosure, there is provided a quantum natural reference-based current metering method applied to the current metering device described above, the method including:
step 1: strictly controlling the experimental environment and keeping the magnetic shielding cylinder 1 at a constant temperature;
step 2: calibrating a standard voltmeter by adopting a quantum voltage reference device based on the Josephson effect, and calibrating a standard resistor by adopting a quantum resistor reference device based on the quantized Hall effect;
and step 3: starting the pumping-detection type atomic magnetometer 3, opening the switch 7, closing the switch 6, outputting quantum current by the current source 8, calibrating the current into quantum current I after the current is introduced into the quantum current measuring component, wherein the quantum current I is the ratio of the standard voltmeter 5 calibrated by quantum voltage reference to the standard resistor 4 calibrated by quantum resistor reference, and measuring the magnetic induction intensity B by the pumping-detection type atomic magnetometer 3 after the quantum current I is introduced into the standard coil 2; changing the current value output by the current source 8 to obtain the magnetic induction intensity B corresponding to a plurality of quantum currents I, and fitting the measured data according to the relation B-C I to obtain the constant coil coefficient C of the standard coil 21；
And 4, step 4: the switch 6 is opened, the switch 7 is closed, the current source 8 outputs a constant current I1And simultaneously measuring the magnetic induction B by using a pumping-detection type atomic magnetometer 31Obtaining the coil coefficient C according to the step 31And relation B1＝C1*I1Calculating the constant current I output by the current source 81And obtaining magnetic field noise or current noise by analyzing the magnetic induction intensity value or the power spectral density of the constant current value within a period of time.
The disclosed current metering device based on quantum natural reference comprises: magnetic field generation component to be measured, pumping-detection type atomic magnetometer 3 and quantum current measurementA measuring assembly; the magnetic field generating assembly to be detected comprises a magnetic shielding cylinder 1, a standard coil 2 and a current source 8; the magnetic shielding cylinder 1 is used for shielding a geomagnetic field, the standard coil 2 is axisymmetrically arranged in the magnetic shielding cylinder 1, and the current source 8 inputs current to the standard coil 2 to generate a magnetic field to be detected; the probe part of the pumping-detection type atomic magnetometer 3 is arranged at the geometric center of the standard coil 2 and is used for measuring a uniform magnetic field on the axis of the standard coil 2; the quantum current measuring component comprises a standard resistor 4 calibrated by a quantum resistor reference and a standard voltmeter 5 calibrated by a quantum voltage reference, and is used for calibrating the current output by the current source 8. The method can utilize a pumping-detection type atomic magnetometer to measure a uniform magnetic field generated by a current-carrying standard coil, and realizes current metering based on the principle that the magnetic field value measured by the pumping-detection type atomic magnetometer and the current value in the standard coil are in a linear relation, wherein the coil coefficients of the standard coil are traced to three quantum natural references of a Josephson effect, a quantized Hall effect and a Larmor precession effect. The invention can calibrate microamperes (10)-6A) The constant current and noise in a wide range from ampere (A) have strong practicability.
Drawings
The accompanying drawings are included to provide a further understanding of the technology or prior art of the present application and are incorporated in and constitute a part of this specification. The drawings expressing the embodiments of the present application are used for explaining the technical solutions of the present application, and should not be construed as limiting the technical solutions of the present application.
FIG. 1 shows a schematic structural diagram of a quantum natural reference based current metering device according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram showing the variation of magnetic induction measured by a pumping-detecting type atomic magnetometer with the output current of a precision current source type B2912A according to one embodiment of the present disclosure;
FIG. 3 is a graph illustrating the variation of magnetic field noise measured by a pumping-detecting atomic magnetometer with the output current of two current sources, model N6705B and model B2912A, according to one embodiment of the present disclosure;
FIG. 4a shows a schematic diagram of magnetic field values measured by a pumping-sensing atomic magnetometer when a 5000nT magnetic field is generated by a current source model N6705B according to one embodiment of the present disclosure;
FIG. 4b shows a schematic diagram of magnetic field values measured by a pumping-detection type atomic magnetometer when a 6000nT magnetic field is generated by a current source model N6705B according to one embodiment of the present disclosure;
FIG. 5a is a schematic diagram showing magnetic field values measured by a pump-detection type atomic magnetometer when a current source model B2912A generates a 5000nT magnetic field according to one embodiment of the present disclosure;
fig. 5B shows a schematic diagram of magnetic field values measured by a pumping-detection type atomic magnetometer when a 6000nT magnetic field is generated by a B2912A type current source according to one embodiment of the present disclosure.
Detailed Description
The following detailed description of the embodiments of the present invention will be provided with reference to the accompanying drawings and examples, so that how to apply the technical means to solve the technical problems and achieve the corresponding technical effects can be fully understood and implemented. The embodiments and the features of the embodiments can be combined without conflict, and the technical solutions formed are all within the scope of the present invention.
Fig. 1 shows a schematic structural diagram of a quantum natural reference-based current metering device according to an embodiment of the present disclosure. The quantum natural reference comprises three quantum natural references, namely a Josephson effect (voltage), a quantized Hall effect (resistance) and a Larmor precession effect (magnetic induction intensity), and the coil coefficients of the standard coil are traced to the three quantum natural references.
A current metering device based on quantum natural reference comprises a magnetic shielding cylinder 1, a standard coil 2, a pumping-detection type atomic magnetometer 3, a standard resistor 4 calibrated by quantum resistor reference, a standard voltmeter 5 calibrated by quantum voltage reference, a switch 6, a switch 7 and a current source 8.
The quantum natural reference based current metering device may include: a magnetic field generating component to be measured, a pumping-detection type atomic magnetometer 3 and a quantum current measuring component.
Wherein, the magnetic shielding cylinder 1, the standard coil 2 and the current source 8 form a magnetic field generating assembly to be measured. The magnetic shielding cylinder 1 is used for shielding a geomagnetic field, the standard coil 2 is arranged in the magnetic shielding cylinder 1 in an axisymmetric manner, and the current source 8 inputs current to the standard coil 2 to generate a magnetic field to be detected.
Preferably, the magnetic shield cylinder 1 is cylindrical, and the inner dimension can be selected to be larger than phi 500mm x 700 mm. The magnetic shield cylinder 1 can also be replaced with a magnetic shield coefficient of less than 10-4The magnetic shield room of (1). When the internal size of the magnetic shielding cylinder 1 or the magnetic shielding room is far larger than that of the standard coil 2, the influence of the current-carrying coil on the magnetization state of the magnetic shielding cylinder can be obviously reduced, and further, the influence on the recurring magnetic field is reduced. The standard coil 2 is sized so that the magnetic field gradient in the probe region of the pumping-detection type atomic magnetometer 3 is less than 1% to ensure that the atomic magnetometer measures the magnetic field with high accuracy.
The probe part of the pumping-detecting type atomic magnetometer 3 is placed at the geometric center of the standard coil 2 and is used for measuring a uniform magnetic field on the axis of the standard coil 2.
For example, the composition and operation principle of the pumping-detection type rubidium atom magnetometer 3 are disclosed in the issued invention patent "a rubidium atom magnetometer and its magnetic field measuring method" (patent number: CN 201710270545.8). The range of the pumping-detection type atomic magnetometer 3 can be 100 nT-100000 nT, and the ultimate sensitivity is 0.2pT/Hz1/2Magnetic field noise induced by precision current source noise in the reproduced magnetic field can be measured. The pumping-detection type atomic magnetometer 3 can be replaced by an atomic magnetometer of other principles, but it should be noted that the range and sensitivity of the atomic magnetometer directly determine the magnitude and noise of current measurement.
The standard resistor 4 calibrated by the quantum resistor reference and the standard voltmeter 5 calibrated by the quantum voltage reference form a quantum current measuring component, and the quantum current measuring component is electrically connected with the current source 8 through the switch 6 and the switch 7 and is used for calibrating the current output by the current source 8.
The magnetic induction intensity B measured by the pumping-detection type rubidium atom magnetometer 3 and the Larmor precession frequency f of the atomic magnetic moment have the following relationship:
b ═ (2 pi/gamma) × f formula (1), wherein gamma is87Gyromagnetic ratio of Rb.
When current passes through the standard coil 2, the magnetic induction intensity B generated by the standard coil 2 is related to the current I by: b ═ C × I formula (2), where C is the coil coefficient of the standard coil.
From equations (1) and (2), the relationship of the current I to the larmor precession frequency f can be obtained:
i ═ 2 pi f/(γ C) formula (3).
At present, quantum voltage reference devices based on the Josephson effect and quantum resistance reference devices based on the quantized Hall effect are built in China, and quantum current is obtained by adopting the ratio of quantum voltage to quantum resistance in electrical metering. In the experiment, the ratio of a standard voltmeter 5 calibrated by quantum voltage reference and a standard resistor 4 calibrated by quantum resistor reference is defined as quantum current I, the current is pumped into a standard coil 2 and then is pumped to a detection type atomic magnetometer 3 to measure magnetic induction intensity B, a series of quantum currents I are set to obtain corresponding magnetic induction intensity B, a coil coefficient C of the standard coil 2 can be obtained according to the formula (2) linear fitting experiment data, the coil coefficient is traced to three quantum natural references of Josephson effect, quantization Hall effect and Larmor precession effect, and in order to avoid errors caused by standard resistor thermal effect, the invention assumes that the quantum current of the coil coefficient C for calibrating the standard coil 2 in the experiment is less than or equal to 5 mA. When the coil coefficient C of the standard coil 2 is obtained and the larmor precession frequency f is measured by the pumping-detection type atomic magnetometer 3, the constant current to be applied to the standard coil 2 can be obtained according to the formula (3).
The following describes a current metering device and a metering method based on quantum natural reference, which are proposed in the summary of the invention, with reference to embodiments.
The first embodiment is as follows:
step 1: the experimental environment is strictly controlled, the constant temperature of the magnetic shielding cylinder 1 (or the magnetic shielding room) is kept, no obvious magnetic field fluctuation and magnetic noise source exist around the magnetic shielding cylinder, the influence of the change of the magnetization state of the magnetic shielding material and the environmental magnetic noise on the magnetic field measurement is reduced, and the remanence in the magnetic shielding cylinder 1 (or the magnetic shielding room) tends to zero after the magnetic shielding cylinder is strictly demagnetized.
Step 2: a quantum voltage reference device based on the Josephson effect is adopted to calibrate a standard voltmeter, and a quantum resistance reference device based on the quantized Hall effect is adopted to calibrate a standard resistor. Since the experimental conditions for transferring the quantum voltage and the quantum resistance are not met when the present invention is provided, in this embodiment, the current source 8 is a 6.5-bit precision current source of german Technology (keylight Technology) B2912A type, and the current of 2mA to 5mA output by the current source is directly regarded as the quantum current.
And step 3: starting the pumping-detection type atomic magnetometer 3, opening the switch 7 and closing the switch 6; the current source 8 outputs current, and after the current is led into the quantum current measurement assembly, the current can be calibrated into quantum current I, the quantum current I is led into the standard coil 2, then the pumping-detection type atomic magnetometer 3 measures magnetic induction intensity B, and a coil coefficient C of the standard coil 2 is calculated according to a relation B ═ C ═ I. Then, the current value output by the current source 8 is changed to obtain the magnetic induction intensity B corresponding to the quantum currents I, and a plurality of measurement data are fitted according to the relation B-C-I to obtain the constant coil coefficient C of the standard coil 21。
For example, because the experimental conditions described in step 2 are not met, the standard resistor 4 calibrated by the quantum resistor reference is replaced by a wire in the present embodiment, and the current in the range of 2mA to 5mA output by the B2912A type precision current source is regarded as the quantum current, and the value thereof is based on the setting value of the B2912A type precision current source; after the quantum current is introduced into the standard coil 2, the magnetic induction intensity B generated by the central uniform region of the standard coil 2 is measured by using the pumping-detection type rubidium atom magnetometer 3 to obtain the magnetic induction intensity B generated by the central uniform region of the standard coil 2. A plurality of magnetic inductions B can be obtained by changing the current value output by the B2912A type precision current source, and the coil coefficient C of the standard coil 2 is obtained by fitting the experimental data according to the relation B ═ C ═ I1。
FIG. 2 shows the variation of magnetic field value measured by the pump-detection type atomic magnetometer with the output current of the B2912A type precision current source, the current is increased from 2mA to 5mA in steps of 0.05mA, the coil coefficient average value of the standard coil 2 is 52426.5nT/A (or 52.4265nT/mA) and the relative standard deviation is 8.3927 × 10-5。
And 4, step 4: the switch 6 is opened, the switch 7 is closed, the current source 8 outputs a constant current I1Wherein the current source 8 is selected from a precision current source B2912A or a DC power source analyzer N6705B of Dekoku corporation, and the magnetic induction B generated in the central region of the standard coil 2 is measured by the pumping-detection type atomic magnetometer 31Obtaining the coil coefficient C according to the step 31And relation B1＝C1*I1Calculating the constant current I output by the current source 81The magnetic field noise or the current noise can be obtained by analyzing the power spectral density of the magnetic induction intensity value or the current value over a period of time.
Fig. 3 shows the variation of the magnetic field noise measured by the pumping-detection type atomic magnetometer with the output current of two types of current sources, model N6705B and model B2912A, wherein the sampling rate of the magnetic field of the pumping-detection type atomic magnetometer is set to 10Hz, the pumping-detection type atomic magnetometer collects magnetic field data for 5 minutes under the constant current condition, and the average value of the power spectral density of the magnetic field data near the frequency point of 1Hz is taken as the magnetic field noise. The current minimum resolution of current source model N6705B is about 2 μ A when outputting current in the range of 1.4-192 mA, the magnetic field measured by the pump-detection type atomic magnetometer is varied in the range of 100 nT-10000 nT, and the magnetic field noise is about 20pT/Hz1/2. The resolution of the output current of the current source of model B2912A automatically switches along with the measuring range value, and the instrument specification indicates that: when the measuring range values output by the current source are respectively 1mA, 10mA, 100mA and 1A, the current resolution of 1nA, 10nA, 100nA and 1 muA is respectively corresponded. When I is>At 100mA, the magnetic field noise is about 15pT/Hz1/2The corresponding current resolution is 1 muA; when 10mA<I<At 100mA (shaded portion in the figure), the magnetic field noise is about 1pT/Hz1/2The corresponding current resolution is 100 nA; when 1mA<I<At 10mA, the magnetic field noise is about 0.2pT/Hz1/2The corresponding current resolution was 10 nA. From the step analysis of the magnetic field noise, the measurement accuracy of the constant current I magnetic field noise of the present disclosure is better than 10-7Better than the highest accuracy achievable with current commercial current sources 10-6The measurement accuracy of the μ a order current can be improved by increasing the coil coefficient of the standard coil 2.
Fig. 4a and 4b show the magnetic field values measured by the pump-detection type atomic magnetometer when a current source model N6705B generates magnetic fields of 5000nT and 6000nT, respectively, in which the peak-to-peak values of the 5000nT and 6000nT magnetic fields are both about 300pT, and the variation of the peak-to-peak value corresponds to the magnetic field noise without steps when the current source model N6705B in fig. 3 is used.
Fig. 5a and 5B show the magnetic field values measured by the pump-detection type atomic magnetometer when the current source model B2912A generates 5000nT and 6000nT magnetic fields, respectively, in which the peak-to-peak value of the 5000nT magnetic field is about 23pT and the peak-to-peak value of the 6000nT magnetic field is about 230pT, and the variation of the peak-to-peak values is in accordance with the step of the magnetic field noise when the current source model B2912A in fig. 3 is used.
According to the relation B ═ C × I, the ratio of the magnetic field noise to the current noise is the coil coefficient. The magnetic field noise obtained using the magnetic field data in FIG. 4a was 20.63pT/Hz1/2The noise of the output current of the DC power supply analyzer N6705B obtained by dividing the value by the coil coefficient C1 is 0.39 muA/Hz1/2This value is 19.5% of the value corresponding to a current resolution of 2 μ a. The magnetic field noise from the magnetic field data in FIG. 5a was 1.19pT/Hz1/2The noise of the output current of the precision current source B2912A, which was obtained by dividing this value by the coil coefficient C, was 22.70nA/Hz1/2This value corresponds to a current resolution of 100nA of 22.7%. The current source noise is about 20% of the current resolution value in value, and the calibration details of data processing and current measurement need to be integrated in the future to give a more reasonable explanation.
In the quantum natural reference-based amperometric device, the pumping-detection type atomic magnetometer 3 has the range of 100 nT-100000 nT, and the microampere can be calibrated (10) by matching the appropriate standard coil 2-6A) To a constant current in the ampere (A) range, and noise, with a current resolution of up to microamperes (10)-6A) The magnitude, wherein the noise measurement precision is superior to the highest precision of the current commercial current source, has strong practicability. It is additionally stated that microamperes (10) are calibrated-6A) To milliamp (10)-3A) In the case of currents in the range, additional reference coils are preferably provided for generating a fixed background magnetic field, so that the measuring magnetic field is subjected to pumpingIn the measuring range of the measuring type atomic magnetometer 3, the method has the advantages that the coil coefficient of the standard coil 2 is effectively reduced on the premise of considering the calibration current range, and the design complexity and the development cost of the standard coil 2 are reduced.
In summary, the first embodiment is a preliminary testing method of the current metering device of the present invention, and a lot of work is required for strict current metering, and the contribution of various measurement processes and experimental conditions to the uncertainty of current metering is analyzed, and the influence of residual magnetism in the magnetic shielding cylinder 1 (or the magnetic shielding chamber) on the measurement result is reasonably analyzed. The embodiment is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A quantum natural reference based current metering device, the device comprising: a magnetic field generating component to be measured, a pumping-detection type atomic magnetometer 3 and a quantum current measuring component;
the magnetic field generating assembly to be detected comprises a magnetic shielding cylinder 1, a standard coil 2 and a current source 8; the magnetic shielding cylinder 1 is used for shielding a geomagnetic field, the standard coil 2 is axisymmetrically arranged in the magnetic shielding cylinder 1, and the current source 8 inputs current to the standard coil 2 to generate a magnetic field to be detected;
the probe part of the pumping-detection type atomic magnetometer 3 is arranged at the geometric center of the standard coil 2 and is used for measuring a uniform magnetic field on the axis of the standard coil 2;
the quantum current measuring component comprises a standard resistor 4 calibrated by a quantum resistor reference and a standard voltmeter 5 calibrated by a quantum voltage reference, and is used for calibrating the current output by the current source 8.
2. The current metering device of claim 1, wherein said magnetic shielding cartridge 1 is cylindrical, has an internal diameter of 500mm, and has an internal length of 700mm or more.
3. Current metering device according to claim 1, characterized in that the magnetic shielding cartridge 1 can be replaced by a magnetic shielding factor of less than 10-4The magnetic shield room of (1).
4. The current metering device according to claim 1, wherein a pumping-detecting type atomic magnetometer 3 is used to measure the magnitude of a uniform magnetic field and noise on the axis of the standard coil 2.
5. A quantum natural reference based amperometric method applied to the amperometric device of claims 1 to 4, comprising:
step 1: strictly controlling the experimental environment and keeping the magnetic shielding cylinder 1 at a constant temperature;
step 2: calibrating a standard voltmeter by adopting a quantum voltage reference device based on the Josephson effect, and calibrating a standard resistor by adopting a quantum resistor reference device based on the quantized Hall effect;
and step 3: starting the pumping-detection type atomic magnetometer 3, opening a switch 7, closing a switch 6, outputting current by a current source 8, calibrating the current into quantum current I after the current is introduced into a quantum current measuring component, wherein the quantum current I is the ratio of a standard voltmeter 5 calibrated by a quantum voltage reference to a standard resistor 4 calibrated by a quantum resistor reference, and measuring the magnetic induction intensity B by the pumping-detection type atomic magnetometer 3 after the quantum current I is introduced into a standard coil 2; changing the current value output by the current source 8 to obtain the magnetic induction intensity B corresponding to a plurality of quantum currents I, and fitting the measured data according to the relation B-C I to obtain the constant coil coefficient C of the standard coil 21；
And 4, step 4: the switch 6 is opened, the switch 7 is closed, the current source 8 outputs a constant current I1And simultaneously measuring the magnetic induction B by using a pumping-detection type atomic magnetometer 31Obtaining the coil coefficient C according to the step 31And relation B1＝C1*I1Calculating the constant current I output by the current source 81By analysing the power spectral density of the magnetic induction strength values or of the constant current values over a period of timeThe degree of which yields magnetic field noise or current noise.
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| CN116087838A (en) * | 2023-02-10 | 2023-05-09 | 中国计量科学研究院 | Bridge circuit-based strong magnetic field measuring device and measuring method |
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| CN115792381A (en) * | 2022-11-24 | 2023-03-14 | 中国计量科学研究院 | Device and method for precisely measuring load coefficient by adopting combined quantum Hall resistor |
| CN115792381B (en) * | 2022-11-24 | 2023-06-23 | 中国计量科学研究院 | Device and method for precisely measuring load coefficient by adopting combined quantum Hall resistor |
| CN116087838A (en) * | 2023-02-10 | 2023-05-09 | 中国计量科学研究院 | Bridge circuit-based strong magnetic field measuring device and measuring method |
| CN116087838B (en) * | 2023-02-10 | 2023-08-22 | 中国计量科学研究院 | Bridge circuit-based strong magnetic field measuring device and measuring method |
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