CN115762843A - Be used for super cold atomic magnetic field precision control device - Google Patents
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- CN115762843A CN115762843A CN202211528108.9A CN202211528108A CN115762843A CN 115762843 A CN115762843 A CN 115762843A CN 202211528108 A CN202211528108 A CN 202211528108A CN 115762843 A CN115762843 A CN 115762843A
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Abstract
The invention discloses a precise control device for an ultra-cold atomic magnetic field, which comprises a magnetic field sensor, a bias circuit, a control circuit and a current source, wherein the magnetic field sensor is arranged at the position closest to an atom, the magnetic field sensor measures the magnetic field near the atom, the measured magnetic field value is converted into voltage to be input into the bias circuit, the magnetic field sensor is arranged at the position very close to the atom, the measured magnetic field value is firstly conducted into the bias circuit (offset board), the value obtained by processing through a bias circuit is then led into a PID control circuit, the PID target value can be adjusted according to the requirement of the magnetic field size, and the PID control circuit outputs corresponding voltage to control a current source coil to control the magnetic field.
Description
Technical Field
The invention relates to the technical field of magnetic field precision control, in particular to a precision control device for an ultra-cold atomic magnetic field.
Background
The precise magnetic field control is crucial to quantum simulation, measurement and calculation based on ultra-cold atomic molecules, an electrified coil and a permanent magnet are mainly used as important tools for generating a required magnetic field, the size of the required magnetic field is different from dozens of milligausses to hundreds of gausses, how to precisely control the magnetic field becomes one of the important tools required by cold atomic application, wherein, reducing magnetic field noise is an important part for precisely controlling the magnetic field, the magnetic field noise consists of a coil for generating the magnetic field and other noises in the environment, the current mainstream magnetic field control mainly comprises passive shielding and active feedback control, at present, the most approximate technical scheme adopts two consistent sensors, and the two sensors are placed at two sides of a cold atom, and are placed into a control circuit by the difference of the measured values of the two sensors, the control circuit mainly consists of two parts, namely a standard voltage and a PID (proportion integration differentiation) control circuit, wherein the standard voltage is used for subtracting the required voltage value, and the control circuit is used for controlling a corresponding current source to achieve the effect of dynamically controlling the magnetic field;
however, the existing ultra-cold atomic magnetic field precise control device needs two magnetic field sensors, is high in cost and complex in control circuit, and has the possibility of mutual interference of the two sensors.
Disclosure of Invention
The invention provides a device for precisely controlling an ultra-cold atomic magnetic field, which can effectively solve the problems that two magnetic field sensors are needed, the cost is high, a control circuit is complex and the two sensors possibly interfere with each other in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme: a precise control device for an ultra-cold atomic magnetic field comprises a magnetic field sensor, a bias circuit, a control circuit and a current source;
the magnetic field sensor is placed at the position closest to the atom, measures the magnetic field near the atom, and converts the measured magnetic field value into voltage to be input into the bias circuit;
the bias circuit consists of two parts, wherein the first part is reference voltage, and the second part is gain adjustment;
subtracting a reference voltage from the voltage measured by the magnetic field sensor, amplifying by using gain adjustment, and inputting into a control circuit, wherein the reference voltage and the gain adjustment are adjusted by corresponding potentiometers;
the control circuit compares the given voltage values obtained from the bias circuit, and then achieves the effect of dynamically balancing the magnetic field by controlling the corresponding current sources.
According to the technical scheme, the operation method comprises the following steps: the magnetic field sensor is arranged at a position very close to an atom, the measured magnetic field value is firstly conducted into a bias circuit (offset board), the value obtained by processing through the bias circuit is then led into the PID control circuit, the target value of the PID can be adjusted according to the requirement of the magnetic field size, and the PID control circuit outputs corresponding voltage to control the current source coil to control the magnetic field.
Compared with the prior art, the invention has the beneficial effects that: the invention uses a magnetic field sensor, realizes magnetic field control of milligauss level with lower cost and simple design, wherein, the reference circuit can realize independent control, so that the fine adjustment and coarse adjustment of the stable magnetic field become very simple and rapid.
Drawings
The accompanying drawings, which are included to provide a further understanding 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 principles of the invention and not to limit the invention.
In the drawings:
FIG. 1 is a control device profile of the present invention;
fig. 2 is a layout diagram of the bias circuit of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it should be understood that they are presented herein only to illustrate and explain the present invention and not to limit the present invention.
The embodiment is as follows: as shown in fig. 1, the present invention provides a technical solution, which is used for an ultra-cold atomic magnetic field precise control device, including a magnetic field sensor (Fluxgate), a bias circuit (offset board), a control circuit (PID control), and a current source (Power Supply);
wherein the magnetic field sensor is placed at a position closest to the atom for measuring the magnetic field in the vicinity of the atom. The magnetic field sensor converts the measured magnetic field value into voltage to be input into the bias circuit;
the bias circuit comprises two parts, wherein the first part is reference voltage, the second part is gain adjustment, the voltage measured by the magnetic field sensor is used for subtracting the reference voltage, and the value obtained by amplifying the voltage by a plurality of times by using the gain adjustment is input into the control circuit, wherein the reference voltage and the gain adjustment can be adjusted by corresponding potentiometers;
the control circuit compares the given voltage values obtained from the programming circuit, and then the effect of dynamically balancing the magnetic field is achieved by controlling the corresponding current sources;
the specific use method comprises the following steps: the magnetic field sensor is arranged at a position very close to an atom, the measured magnetic field value is firstly conducted into an offset circuit (offset board), the value obtained by processing through the offset circuit is then led into a PID control circuit, the target value of the PID can be adjusted according to the requirement of the magnetic field size, and the PID control circuit outputs corresponding voltage to control a current source coil to control the magnetic field.
As shown in fig. 2, IC1 of the bias circuit serves as a reference voltage required to provide the circuit, and IC2 provides the required gain adjustment.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the 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 (2)
1. The utility model provides a be used for super cold atomic magnetic field fine control device which characterized in that: the magnetic field sensor, the bias circuit, the control circuit and the current source are included;
the magnetic field sensor is placed at the position closest to the atom, measures the magnetic field near the atom, and converts the measured magnetic field value into voltage to be input into the bias circuit;
the bias circuit consists of two parts, wherein the first part is reference voltage, and the second part is gain adjustment;
subtracting a reference voltage from the voltage measured by the magnetic field sensor, amplifying by using gain adjustment, and inputting into a control circuit, wherein the reference voltage and the gain adjustment are adjusted by corresponding potentiometers;
the control circuit compares the given voltage values obtained from the bias circuit, and then achieves dynamic balance of the magnetic field by controlling the corresponding current sources.
2. The apparatus of claim 1, wherein the operation method comprises: the magnetic field sensor is placed at a position close to an atom, the measured magnetic field value is firstly conducted into an offset circuit (offset board), the value obtained by processing through the offset circuit is then led into a PID control circuit, the target value of the PID can be adjusted according to the requirement of the magnetic field size, and the PID control circuit outputs corresponding voltage to control a current source coil to control the magnetic field.
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| CN202211528108.9A CN115762843A (en) | 2022-12-01 | 2022-12-01 | Be used for super cold atomic magnetic field precision control device |
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| CN202211528108.9A CN115762843A (en) | 2022-12-01 | 2022-12-01 | Be used for super cold atomic magnetic field precision control device |
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| CN115762843A true CN115762843A (en) | 2023-03-07 |
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Application publication date: 20230307 |