CN210090656U - Current standard device based on quantum precision measurement - Google Patents

Current standard device based on quantum precision measurement Download PDF

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Publication number
CN210090656U
CN210090656U CN201920451389.XU CN201920451389U CN210090656U CN 210090656 U CN210090656 U CN 210090656U CN 201920451389 U CN201920451389 U CN 201920451389U CN 210090656 U CN210090656 U CN 210090656U
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current
coil
magnetic field
primary side
controller
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Inventor
赵龙
胡世骏
高博
郑国强
徐斌
汪玉
王鑫
仇茹嘉
杨海涛
谢毓广
丁津津
计长安
潘丽珠
毛荀
程石
陈凡
李圆智
李远松
王小明
何开元
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Anhui Electric Power Co Ltd
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Anhui Electric Power Co Ltd
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Abstract

The utility model discloses embodiment provides a current standard device based on quantum precision measurement belongs to the precision measurement technical field of electric current. The current standard device comprises: the magnetic conductive ring is provided with a notch; the first coil and the second coil are nested in the magnetic conductive ring, the second coil is used for inputting current to be detected, and the number of turns of the first coil is equal to that of the second coil; the primary side power supply is connected with the first coil and used for inputting primary side current; the quantum sensor is arranged at the notch and used for measuring the magnetic field intensity at the notch; the controller is respectively connected with the primary power supply and the quantum sensor and is used for: controlling the primary side power supply to input the primary side current to the first coil according to the magnetic field intensity; and calculating the current to be measured according to the primary side current. The current standard device can realize accurate measurement of current in a wide frequency band range.

Description

Current standard device based on quantum precision measurement
Technical Field
The utility model relates to an accurate measurement technical field of electric current specifically relates to a current standard device based on quantum accurate measurement.
Background
The current standard device is one of important measuring devices for accurately measuring current, and has the advantages of high precision, strong anti-interference capability and simple and convenient operation. However, with the development of smart grids, the current measuring device based on the faraday magneto-optical effect has exposed many problems in practical engineering applications, such as interference resistance, temperature drift, and accuracy of electronic and optical devices.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a current standard device based on quantum precision measurement, this current standard device can realize the precision measurement to the electric current at broadband within range.
In order to achieve the above object, the present invention provides a current standard device based on quantum precision measurement, which may include:
the magnetic conductive ring is provided with a notch;
the first coil and the second coil are nested in the magnetic conductive ring, the second coil is used for inputting current to be detected, and the number of turns of the first coil is equal to that of the second coil;
the primary side power supply is connected with the first coil and used for inputting primary side current;
the quantum sensor is arranged at the notch and used for measuring the magnetic field intensity at the notch;
the controller is respectively connected with the primary power supply and the quantum sensor and is used for:
controlling the primary side power supply to input the primary side current to the first coil according to the magnetic field intensity;
and calculating the current to be measured according to the primary side current.
Optionally, the controller further comprises a laser generator;
the quantum sensor further comprises an NV color center element and a microwave antenna, the microwave antenna is used for sending a microwave signal to the NV color center element, the laser generator is used for sending a laser signal to the NV color center element, and the NV color center element is used for generating a feedback signal according to the magnetic field intensity at the notch under the condition that the microwave signal and the laser signal are received;
the controller is further configured to calculate the magnetic field strength from the feedback signal.
Optionally, the primary power supply further comprises:
a voltage regulation module for providing a voltage output to the first coil;
a standard resistor connected between the first coil and the voltage regulation module;
and the voltage sensor is connected with the standard resistor in parallel and is used for detecting the voltage at two ends of the standard resistor.
Optionally, the current standard device further comprises: and the display is connected with the controller and is used for displaying the magnetic field intensity.
Optionally, the flow standard apparatus further comprises: and the input unit is connected with the controller and is used for a worker to manually adjust the primary current.
Through the technical scheme, the utility model provides a current standard device based on quantum precision measurement compares through the magnetic field with the magnetic field of the primary side electric current of waiting to measure the electric current and inputing in advance, under the condition that the magnetic field intensity difference between them is 0, realizes the measurement to the electric current that awaits measuring with the numerical value of primary side electric current, has realized the precision measurement to the electric current in the scope of broadband electric current; on the other hand, the quantum sensor is adopted to measure the magnetic field intensity difference between the current standard device and the current standard device, so that the influence on measurement caused by temperature and other reasons is avoided, and the robustness of the current standard device is improved.
Other features and advantages of embodiments of the present invention will be described in detail in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention, but do not constitute a limitation of the embodiments of the invention. In the drawings:
fig. 1 is a schematic structural diagram of a current standard device based on quantum precision measurement according to an embodiment of the present invention;
fig. 2 is a flowchart of a control method of a controller according to an embodiment of the present invention;
fig. 3 is a partial block diagram of the components of a current normalization device based on quantum precision measurement according to an embodiment of the present invention; and
fig. 4 is a partial block diagram of the current standard device based on quantum precision measurement according to an embodiment of the present invention.
Description of the reference numerals
01. Magnetic conductive ring 02, first coil
03. Second coil 04, primary side power supply
05. Quantum sensor 06 and controller
07. Laser generator 08, NV color center element
09. Microwave antenna 10 and voltage regulating module
11. Standard resistor 12 and voltage sensor
13. First lens group 14, second lens group
15. Photoelectric converter
Detailed Description
The following describes in detail embodiments of the present invention with reference to the accompanying drawings. It is to be understood that the description herein is merely for purposes of illustration and explanation and is not intended to limit the embodiments of the present invention.
Fig. 1 is a schematic structural diagram of a current standard device based on quantum precision measurement according to an embodiment of the present invention. In fig. 1, the current reference device may include a magnetic conductive ring 01, a first coil 02, a second coil 03, a primary power source 04, a quantum sensor 05, and a controller 06.
In this embodiment, in order to facilitate the quantum sensor 05 to detect the magnetic field intensity in the magnetic conductive ring 01, the magnetic conductive ring 01 may have a notch.
The first coil 02 and the second coil 03 may be nested in different positions (e.g., the positions shown in fig. 1) of the magnetic conductive ring 01, respectively. The second coil 03 can be used for inputting a current to be measured. In addition, in order to enable the primary current input by the primary power supply 04 and the current to be measured to generate the same magnetic field strength under the same current strength, the number of turns of the first coil 02 and the second coil 03 can be equal.
A primary power source 04 may be connected to the first coil 02 for inputting a primary current. The quantum sensor 05 may be arranged at the gap for measuring the magnetic field strength at the gap.
The controller 06 can be connected to the primary power source 04 and the quantum sensor 05, respectively, and is configured to control the primary power source 04 to input a primary current to the first coil according to the magnetic field strength, and calculate a current to be measured according to the primary current.
Since the number of turns of the first coil 02 and the second coil 03 is equal, the magnetic field strength generated by the two coils should be equal under the condition that the current to be measured and the primary current are equal. Therefore, in this embodiment, the controller 06 can output the current value of the primary current as the detected value of the current to be measured when the magnetic field strength detected by the quantum sensor 05 is 0. Specifically, the operation performed by the controller 06 may be, for example, the method illustrated in fig. 2. In fig. 2, taking the magnetic field strength detected by the quantum sensor 05 as the difference between the magnetic field strength generated by the primary current and the magnetic field strength generated by the current to be measured as an example, the method may include:
in step S10, it is determined whether or not the magnetic field strength detected by the quantum sensor 05 is 0;
in step S11, when it is determined that the magnetic field strength is not 0, it is determined whether or not the magnetic field strength is greater than 0;
in step S12, when it is determined that the magnetic field strength is greater than 0, the current value of the primary current is decreased;
in step S13, the current value of the primary side current is increased when it is determined that the magnetic field strength is less than 0;
in step S14, when the magnetic field strength is determined to be 0, the current value of the primary current is output as the measurement result of the current to be measured.
The basic principle of the quantum sensor 05 for measuring the magnetic field intensity is realized by the principle that an NV color center generates electron spin resonance under the influence of microwaves in an external magnetic field. Thus, in this embodiment, as shown in fig. 3, the quantum sensor 05 may further include an NV color center element 08 and a microwave antenna 09. The current standard device may also further comprise a laser generator 07.
Due to the nature of the NV colour centre element itself, when a magnetic field is present outside the NV colour centre element 08, electrons in the ground state undergo energy level splitting according to the theory of the zeeman effect. Since the electron itself has a spin of 1/2, the electron can be split into two energy levels under an applied magnetic field. When an electromagnetic wave having a frequency equal to the energy level separation distance between the two energy levels is applied to an electron, a transition phenomenon (ESR, electron spin resonance) between the energy levels occurs, and then the magnetic field strength of the external magnetic field can be calculated by calculating the difference between the two frequencies. Therefore, in this embodiment, the microwave antenna 09 may be used to emit a microwave signal to the NV color center element 08 to generate an electron spin resonance phenomenon. The NV color center element 08 can generate a feedback signal according to the surrounding magnetic field strength (the electron spin resonance occurs) when a microwave signal (of a predetermined frequency) is received. Further, as for the wavelength of the laser light, the wavelength should be known to those skilled in the art based on the above-described physical phenomenon. In a preferred example of the present invention, the wavelength of the laser light may be 532 nm.
Thus, in this embodiment, the laser generator 07 may be configured to emit a laser signal to the NV colour centre element 08, and the controller 06 may control the microwave antenna 09 to emit a microwave signal to the NV colour centre element, and the NV colour centre element 08 generates a feedback signal in response to the surrounding magnetic field (electron spin resonance occurs) upon receiving the microwave signal and the laser signal. The controller 06 analyzes the feedback signal to obtain the magnetic field strength detected by the quantum sensor 05.
In addition, since the quantum sensor 05 includes the NV color center element 08 and the microwave antenna 09, the laser generator 07 can be connected to the NV color center element 08 through an optical fiber. Further, in order to improve the utilization efficiency of the laser signal, a first lens group 13 for condensing the laser signal may be disposed between the optical fiber and the NV color center element 08. In order to receive the feedback signal of the NV color center element 08, a second lens group 14 for converging the feedback signal and an optical-electrical converter 15 for converting the feedback signal from an optical signal mode to an electrical signal mode may be connected in series between the controller 06 and the NV color center element 08.
The controller 06 can calculate the magnetic field strength from the feedback signal. Specifically, because electron spin Resonance occurs at the NV color center, the red fluorescence in the feedback signal is the weakest, and therefore, the ODMR (Optical detection Magnetic Resonance) spectrum of the feedback signal can be obtained. The magnetic field strength measured by each quantum sensor 05 can then be obtained by further calculation of the ODMR spectrum.
In one embodiment of the present invention, as shown in fig. 4, the primary power source 04 may further include a voltage regulating module 10, a standard resistor 11, and a voltage sensor 12. The voltage regulation module 10 may be used to provide a voltage output to the first coil 02; a reference resistor 11 may be connected between the first coil 02 and the voltage regulating module 10; the voltage sensor 12 may be connected in parallel with the reference resistor 11 for detecting the voltage across the reference resistor 11. The controller 06 may be connected to the voltage regulating module 10 and the voltage sensor 12, respectively, and calculate the primary side current according to the formula (1),
Figure BDA0002016973890000061
wherein I is the primary current, U is the voltage across the standard resistor 11, r0Is the resistance of the standard resistor 11.
In addition, for the winding directions of the first coil 02 and the second coil 03, on the premise that the directions of the magnetic fields of the first coil 02 and the second coil 03 are opposite, the corresponding relationship between the winding directions of the first coil 02 and the second coil 03, the primary side current and the current to be measured can be various and known by those skilled in the art. In a preferred example of the present invention, the winding directions of the first coil 02 and the second coil 03 may be directions as shown in fig. 1, and the directions of the primary current and the current to be measured may also be directions as shown in fig. 1.
In one embodiment of the present invention, the current standard device further comprises a display in view of the calibration operation of the apparatus. The display may be connected to the controller 06 for displaying a value of the magnetic field strength. Accordingly, the current standard apparatus may further include an input unit. The input unit may be connected to the controller 06 for the staff to manually adjust the primary current. Through above-mentioned mode of setting, when carrying out calibration operation to this current standard device, can be through inputing first coil 02 and second coil 03 simultaneously with the electric current of equidimension (the direction of electric current can be confirmed according to right hand spiral rule), adjust quantum sensor 05's reading to 0 again to avoid measuring inaccurate problem emergence because environmental factor or equipment life problem lead to.
Through the technical scheme, the utility model provides a current standard device based on quantum precision measurement compares through the magnetic field with the magnetic field of the primary side electric current of waiting to measure the electric current and inputing in advance, under the condition that the magnetic field intensity difference between them is 0, realizes the measurement to the electric current that awaits measuring with the numerical value of primary side electric current, has realized the precision measurement to the electric current in the scope of broadband electric current; on the other hand, the quantum sensor is adopted to measure the magnetic field intensity difference between the current standard device and the current standard device, so that the influence on measurement caused by temperature and other reasons is avoided, and the robustness of the current standard device is improved.
The above describes in detail optional embodiments of the present invention with reference to the accompanying drawings, however, the embodiments of the present invention are not limited to the details of the above embodiments, and the technical concept of the embodiments of the present invention can be within the scope of the present invention, and can be modified in a variety of ways, and these simple modifications all belong to the protection scope of the embodiments of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention do not separately describe various possible combinations.
In addition, various different embodiments of the present invention can be combined arbitrarily, and the embodiments of the present invention should be considered as disclosed in the embodiments of the present invention as long as the embodiments do not depart from the spirit of the embodiments of the present invention.

Claims (5)

1. A current standard device based on quantum precision measurement, which is characterized by comprising:
the magnetic conductive ring is provided with a notch;
the first coil and the second coil are nested in the magnetic conductive ring, the second coil is used for inputting current to be detected, and the number of turns of the first coil is equal to that of the second coil;
the primary side power supply is connected with the first coil and used for inputting primary side current;
the quantum sensor is arranged at the notch and used for measuring the magnetic field intensity at the notch;
the controller is respectively connected with the primary power supply and the quantum sensor and is used for:
controlling the primary side power supply to input the primary side current to the first coil according to the magnetic field intensity;
and calculating the current to be measured according to the primary side current.
2. The current standard device of claim 1, wherein the controller further comprises a laser generator;
the quantum sensor further comprises an NV color center element and a microwave antenna, the microwave antenna is used for sending a microwave signal to the NV color center element, the laser generator is used for sending a laser signal to the NV color center element, and the NV color center element is used for generating a feedback signal according to the magnetic field intensity at the notch under the condition that the microwave signal and the laser signal are received;
the controller is further configured to calculate the magnetic field strength from the feedback signal.
3. The current standard apparatus of claim 1, wherein the primary power source further comprises:
a voltage regulation module for providing a voltage output to the first coil;
a standard resistor connected between the first coil and the voltage regulation module;
and the voltage sensor is connected with the standard resistor in parallel and is used for detecting the voltage at two ends of the standard resistor.
4. The current standard apparatus of claim 1, further comprising: and the display is connected with the controller and is used for displaying the magnetic field intensity.
5. The current standard apparatus of claim 4, further comprising: and the input unit is connected with the controller and is used for a worker to manually adjust the primary current.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110045310A (en) * 2019-04-03 2019-07-23 国家电网有限公司 Current standard device based on quantum accurate measurement
CN115556586A (en) * 2022-10-11 2023-01-03 江苏欧力特能源科技有限公司 Battery module electric quantity estimation device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110045310A (en) * 2019-04-03 2019-07-23 国家电网有限公司 Current standard device based on quantum accurate measurement
CN115556586A (en) * 2022-10-11 2023-01-03 江苏欧力特能源科技有限公司 Battery module electric quantity estimation device
CN115556586B (en) * 2022-10-11 2023-08-22 江苏欧力特能源科技有限公司 Battery module electric quantity estimation device

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