CN114942663B - Current source feedback circuit based on atomic magnetometer - Google Patents
Current source feedback circuit based on atomic magnetometer Download PDFInfo
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- CN114942663B CN114942663B CN202210426439.5A CN202210426439A CN114942663B CN 114942663 B CN114942663 B CN 114942663B CN 202210426439 A CN202210426439 A CN 202210426439A CN 114942663 B CN114942663 B CN 114942663B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/0023—Electronic aspects, e.g. circuits for stimulation, evaluation, control; Treating the measured signals; calibration
- G01R33/0029—Treating the measured signals, e.g. removing offset or noise
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- 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
- G01R33/032—Measuring direction or magnitude of magnetic fields or magnetic flux using magneto-optic devices, e.g. Faraday or Cotton-Mouton effect
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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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- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
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- Automation & Control Theory (AREA)
- Power Engineering (AREA)
- Measuring Magnetic Variables (AREA)
Abstract
The invention discloses a current source feedback circuit based on an atomic magnetometer, which comprises an error amplifier, an adjusting tube, a metal shielding chamber, a coil, an atomic magnetometer probe, a magnetometer circuit unit and a load R L The method comprises the steps of carrying out a first treatment on the surface of the Error amplifier for amplifying reference voltage V REF And feedback voltage V S A difference between them; the adjusting tube is used for receiving the output from the error amplifier so as to adjust the output current; the metal shielding chamber is used for shielding geomagnetic field and magnetic field interference of the environment; the coil is used for enabling the current to flow through to generate a corresponding magnetic field, namely, converting the magnitude of the current into the magnitude of the magnetic field; the atomic magnetometer probe is used for inducing the magnitude of a magnetic field or the change of the magnetic field and converting the magnitude of the magnetic field into voltage; the atomic magnetometer circuit unit is used for converting small signals from the atomic magnetometer probe into corresponding large feedback voltage V S . The atomic magnetometer probe has the characteristics of high precision, high sensitivity and high response speed, and can effectively improve the precision and stability of output current.
Description
Technical Field
The invention relates to the technical field of current source design, in particular to a current source feedback circuit based on an atomic magnetometer.
Background
In the current source design, a negative feedback structure is an important means of current stabilization, so that the output is generally fed back to an error amplifier to be compared with a reference voltage by connecting sampling resistors in series in an output main circuitThe output current and the reference voltage are linearly related, and the stability of the reference voltage can reach 10 in a short time at present -8 On the order of magnitude, but the stability of the output current (drift of current over time) is much smaller than that of the reference voltage, especially in large currents, the current stability is very difficult to reach 10 -6 The magnitude and the precision of the current are also reduced along with the increase of the current, wherein the biggest reason is influenced by the stability and the precision of the sampling resistor, and the resistance value of the sampling resistor is changed by different currents flowing through the resistor due to the load effect of the resistor, and the change is often nonlinear and difficult to correct; meanwhile, the sampling resistor generates heat due to high power consumption under high current, and the resistance value of the sampling resistor also changes under the influence of the temperature coefficient of the resistor. Therefore, converting the output current into voltage using the sampling resistor and feeding back the voltage to the error amplifier may degrade the stability and accuracy of the output current.
Disclosure of Invention
In view of the above, in order to solve the above problems in the prior art, the present invention provides a current source feedback circuit based on an atomic magnetometer, in which a weak signal induced by a probe of the atomic magnetometer is amplified by a magnetometer circuit unit and output to an input end of an error amplifier, so as to form a closed-loop negative feedback circuit, thereby effectively improving accuracy and stability of an output current.
The invention solves the problems by the following technical means:
a current source feedback circuit based on an atomic magnetometer comprises an error amplifier, an adjusting tube, a metal shielding chamber, a coil, an atomic magnetometer probe, a magnetometer circuit unit and a load R L ；
The coil and the atomic magnetometer probe are arranged in the metal shielding chamber;
the error amplifier is used for amplifying the reference voltage V REF And feedback voltage V S A difference between them;
the adjusting tube is used for receiving the output from the error amplifier so as to adjust the output current, and the output current flows to the coil;
the metal shielding chamber is used for shielding geomagnetic field and magnetic field interference of the environment;
the coil is used for enabling the current to flow through to generate a corresponding magnetic field, namely, converting the magnitude of the current into the magnitude of the magnetic field;
the atomic magnetometer probe is used for inducing the magnitude of a magnetic field or the change of the magnetic field and converting the magnitude of the magnetic field into voltage;
the magnetometer circuit unit is used for converting small signals from the atomic magnetometer probe into corresponding large feedback voltage V S ；
The load R L For converting the current flowing through the coil into other forms of energy.
Further, the atomic magnetometer probe is arranged at the axis of the coil.
Further, the principle of conversion of the measured physical quantity of the coil, the atomic magnetometer probe, and the magnetometer circuit unit as the feedback path is as follows:
the magnetic field intensity B distribution on the axis of the electrified round coil is as follows:
wherein mu is 0 Is the magnetic permeability of air, N is the number of turns of the round coil, R is the radius of the round coil, I OUT Is the current of the current source, r 0 Is the distance from the point on the axis to the axis; when the atomic magnetometer probe is placed in the axle center, r 0 Magnetic field intensity B of center point of energized round coil =0 0 The method comprises the following steps:
when the output current I of the current source OUT The atomic magnetometer probe detects the magnetic field by utilizing the interaction of internal laser and atoms, the light interacts with the atoms doing the pulling Mo Jindong, the polarization direction of the light can be slightly deflected, the passing light intensity is changed due to the change of the polarization angle, and then the light passes through an internal photoelectric detection deviceConverting the optical signal into a weak electrical signal, and transmitting the weak electrical signal to a magnetometer circuit unit, wherein the magnetometer circuit unit amplifies the weak electrical signal to output a current I OUT Converted into a voltage quantity.
Compared with the prior art, the invention has the beneficial effects that at least:
the weak signal induced by the atomic magnetometer probe is amplified by the magnetometer circuit unit and is output to the input end of the error amplifier to form a closed-loop negative feedback circuit, and the high-current can be measured due to the small power consumed by the coil in the output loop, and meanwhile, the atomic magnetometer probe has the characteristics of high precision, high sensitivity and high response speed, and can effectively improve the precision and stability of the output current.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic circuit diagram of a current source feedback circuit based on an atomic magnetometer of the present invention.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, the following detailed description of the technical solution of the present invention refers to the accompanying drawings and specific embodiments. It should be noted that the described embodiments are only some embodiments of the present invention, and not all embodiments, and that all other embodiments obtained by persons skilled in the art without making creative efforts based on the embodiments in the present invention are within the protection scope of the present invention.
As shown in FIG. 1, the invention provides a current source feedback circuit based on an atomic magnetometer, which comprises an error amplifier, an adjusting tube, a metal shielding chamber, a coil, an atomic magnetometer probe, a magnetometer circuit unit and a load R L ；
The coil and the atomic magnetometer probe are arranged in the metal shielding chamber;
the error amplifier is used for amplifying the reference voltage V REF And feedback voltage V S A difference between them;
the adjusting tube is used for receiving the output from the error amplifier so as to adjust the output current, and the output current flows to the coil;
the metal shielding chamber is used for shielding geomagnetic field and magnetic field interference of the environment;
the coil is used for enabling the current to flow through to generate a corresponding magnetic field, namely, converting the magnitude of the current into the magnitude of the magnetic field;
the atomic magnetometer probe is used for inducing the magnitude of a magnetic field or the change of the magnetic field and converting the magnitude of the magnetic field into voltage;
the magnetometer circuit unit is used for converting small signals from the atomic magnetometer probe into corresponding large feedback voltage V S ；
The load R L For converting the current flowing through the coil into other forms of energy.
The coil, atomic magnetometer probes, and magnetometer circuit units are calibrated by standard sources. Output current I from the regulating tube OUT A coil flowing through the metal shielding chamber, wherein the metal shielding chamber is used for shielding geomagnetic field and magnetic field interference of the environment, and the coil generates a magnetic field with a certain size under the action of current, and the magnetic field changes along with the change of the current; the atomic magnetometer probe arranged in the center of the coil detects the size of a magnetic field by utilizing the interaction of internal laser and atoms, light interacts with atoms doing a pull Mo Jindong, the polarization direction of the atomic magnetometer probe can be slightly deflected, the passing light intensity is changed due to the change of the polarization angle, and then an optical signal is converted into a weak electric signal by an internal photoelectric detection device; the weak signal is amplified by a magnetometer circuit unit and output to the input end of an error amplifier to form a closed-loop negative feedback circuit. Because the power consumed by the coil in the output loop is very small, the high current can be measured, and meanwhile, the atomic magnetometer probe has high precision and high sensitivity response speedThe characteristic of fast degree can effectively improve output current precision and stability.
The atomic magnetometer is an ultrasensitive vector magnetometer used in a low-field environment, and has the characteristics of high sensitivity, high precision and high response speed, and the measurable frequency is 100Hz at most. It is the most sensitive magnetic field detector, and the sensitivity is superior to 15fT/HZ in application 1/2 The performance is comparable to that of a quantum superconducting interferometer, but the atomic magnetometer probe can be used at room temperature unlike the quantum superconducting interferometer which is used at extremely low temperature, devices such as a laser, a photoelectric detector and the like are integrated in the atomic magnetometer probe, an optical fiber or a low-temperature device is not needed, and each zero-field probe is self-calibrated and can synchronously measure two-axis components.
The principle of conversion of the measured physical quantity by using a coil, an atomic magnetometer probe and a magnetometer circuit unit as a feedback path is as follows:
the magnetic field intensity B distribution on the axis of the electrified round coil is as follows:
wherein mu is 0 Is the magnetic permeability of air, N is the number of turns of the round coil, R is the radius of the round coil, I OUT Is the current of the current source, r 0 Is the distance from the point on the axis to the axis. When the atomic magnetometer probe is placed in the axle center, r 0 Magnetic field intensity B of center point of energized round coil =0 0 The method comprises the following steps:
when the output current I of the current source OUT The atomic magnetometer probe detects the magnetic field by utilizing the interaction of internal laser and atoms, the light interacts with the atoms doing the pulling Mo Jindong, the polarization direction of the light can be slightly deflected, the passing light intensity is changed due to the change of the polarization angle, and then the optical signal is converted into micro through an internal photoelectric detection deviceThe weak electrical signal is transmitted to the magnetometer circuit unit, which amplifies the weak electrical signal, thereby outputting the current I OUT Converted into a voltage quantity.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (3)
1. A current source feedback circuit based on an atomic magnetometer is characterized by comprising an error amplifier, an adjusting tube, a metal shielding chamber, a coil, an atomic magnetometer probe, a magnetometer circuit unit and a load R L ；
The coil and the atomic magnetometer probe are arranged in the metal shielding chamber;
the error amplifier is used for amplifying the reference voltage V REF And feedback voltage V S A difference between them;
the adjusting tube is used for receiving the output from the error amplifier so as to adjust the output current, and the output current flows to the coil;
the metal shielding chamber is used for shielding geomagnetic field and magnetic field interference of the environment;
the coil is used for enabling the current to flow through to generate a corresponding magnetic field, namely, converting the magnitude of the current into the magnitude of the magnetic field;
the atomic magnetometer probe is used for inducing the magnitude of a magnetic field or the change of the magnetic field and converting the magnitude of the magnetic field into voltage;
the magnetometer circuit unit is used for converting small signals from the atomic magnetometer probe into corresponding large feedback voltage V S ；
The load R L For converting the current flowing through the coil into other forms of energy;
output current I from the regulating tube OUT The coil flows through the metal shielding chamber, the metal shielding chamber is used for shielding geomagnetic field and magnetic field interference of the environment, the coil generates a magnetic field with a certain size under the action of current, and the magnetic field generated by the coil under the action of current changes along with the change of the current; the atomic magnetometer probe arranged in the center of the coil detects the size of a magnetic field by utilizing the interaction of internal laser and atoms, light interacts with atoms doing a pull Mo Jindong, the polarization direction of the atomic magnetometer probe can be slightly deflected, the passing light intensity is changed due to the change of the polarization angle, and then an optical signal is converted into a weak electric signal by an internal photoelectric detection device; the weak electric signal is amplified by the magnetometer circuit unit and output to the input end of the error amplifier to form a closed-loop negative feedback circuit.
2. The atomic magnetometer-based current source feedback circuit of claim 1, wherein the atomic magnetometer probe is disposed at an axis of a coil.
3. The atomic magnetometer-based current source feedback circuit according to claim 1, wherein the principle of conversion of the measured physical quantities of the coil, the atomic magnetometer probe and the magnetometer circuit unit as feedback paths is as follows:
the magnetic field intensity B distribution on the axis of the electrified round coil is as follows:
；
in the method, in the process of the invention,is the magnetic permeability of air, N is the number of turns of the round coil, R is the radius of the round coil, I OUT Is the current of the current source, ">Is the distance from the point on the axis to the axis; when the atomic magnetometer probe is placed in the spindle, and (2)>Magnetic field strength of the center point of the energized circular coil +.>The method comprises the following steps:
；
when the output current I of the current source OUT The atomic magnetometer probe utilizes the interaction of internal laser and atoms to detect the magnitude of magnetic field, the light interacts with atoms doing the pulling Mo Jindong, the polarization direction of the light can be slightly deflected, the passing light intensity is changed due to the change of the polarization angle, and then the light signal is converted into a weak electric signal through an internal photoelectric detection device and is transmitted to the magnetometer circuit unit, the magnetometer circuit unit amplifies the weak electric signal, and thus the output current I is outputted OUT Converted into a voltage quantity.
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| CN202210426439.5A CN114942663B (en) | 2022-04-21 | 2022-04-21 | Current source feedback circuit based on atomic magnetometer |
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| CN202210426439.5A CN114942663B (en) | 2022-04-21 | 2022-04-21 | Current source feedback circuit based on atomic magnetometer |
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| CN114942663B true CN114942663B (en) | 2023-10-20 |
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