Special-shaped passive magnetic shielding system of miniaturized atomic spinning gyroscope

Abstract

The invention relates to a special-shaped passive magnetic shielding system of a miniaturized atomic spinning gyroscope, which is beneficial to improving the magnetic shielding effect and the uniformity of an internal magnetic field through the design of a special-shaped high-shielding-factor shielding layer, and provides reliable technical guarantee for the implementation of a high-precision gyroscope, and is characterized by comprising the following steps of: defining a special-shaped space in the special-shaped high-shielding-factor shielding layer; the special-shaped space comprises a columnar cavity, an upright frustum-shaped cavity and an inverted frustum-shaped cavity, wherein the upright frustum-shaped cavity is contracted from an upper opening of the columnar cavity to an upper extending edge, and the inverted frustum-shaped cavity is contracted from a lower opening of the columnar cavity to a lower extending edge.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic shielding technology, and in particular to a miniaturized atomic spin gyroscope irregularly shaped passive magnetic shielding system. Background Technology

[0002] Spin Exchange Relaxation Free (SERF) magnetic field and inertial measurement units (SMUs) are widely used in cutting-edge science, fundamental physics, and biomedicine due to their extremely high sensitivity. However, magnetic interference in the environment can significantly affect the high sensitivity performance of SERF devices. Therefore, multi-layered passive magnetic shielding is typically used to suppress external magnetic field interference and provide a stable, weak magnetic environment for the SERF device. In the absence of external interference, its limiting sensitivity is only limited by quantum noise, but the magnetic noise generated by the magnetic shielding material itself directly affects the device's sensitivity. Currently, commonly used magnetic shielding systems consist of an outer layer of multi-layered cylindrical permalloy and an inner layer of ferrite structure to achieve a high shielding coefficient and low magnetic noise, suppressing both environmental electromagnetic interference and reducing the magnetic noise of the material itself. This combined magnetic shielding system has achieved a sensitivity of 0.7 fT / Hz. 1 / 2 @30Hz magnetic noise level.

[0003] Traditional SERF inertial measurement systems primarily use passive magnetic shielding systems with cylindrical high-permeability shielding layers. However, under miniaturization requirements, this structure offers limited magnetic shielding performance, restricting further improvements in the sensitivity of the SERF device. Therefore, designing a novel passive magnetic shielding system with ultra-high magnetic shielding performance is particularly necessary. In view of this, this invention is proposed. Summary of the Invention

[0004] This invention addresses the deficiencies or shortcomings of existing technologies by providing a miniaturized atomic spin gyroscope with an irregularly shaped passive magnetic shielding system. Through the design of an irregularly shaped high shielding factor shielding layer, the magnetic shielding effect and the uniformity of the internal magnetic field are improved, providing a reliable technical guarantee for the realization of high-precision gyroscopes.

[0005] The technical solution of the present invention is as follows:

[0006] A non-circular passive magnetic shielding system for miniaturized atomic spin gyroscopes is characterized by defining a non-circular space within a non-circular high shielding factor shielding layer. The non-circular space includes a cylindrical cavity, an upright frustum-shaped cavity extending upwards and contracting from the upper opening of the cylindrical cavity, and an inverted frustum-shaped cavity extending downwards and contracting from the lower opening of the cylindrical cavity.

[0007] The irregularly shaped high shielding factor shielding layer is made of permalloy material. The irregularly shaped high shielding factor shielding layer has a multi-layer structure. The layers are isolated by spacers to control the interlayer distance. The spacers are made of magnetic insulating material to ensure interlayer insulation and reduce magnetic coupling effect.

[0008] The irregularly shaped high shielding factor shielding layer and the low magnetic noise shielding layer are isolated by a spacer ring to control the interlayer distance. The spacer ring is made of magnetic insulating material to ensure interlayer insulation and reduce magnetic coupling effect.

[0009] The irregular space has transverse and longitudinal through-laser apertures leading to the outside of the irregular high shielding factor shielding layer.

[0010] Both the upright frustum-shaped cavity and the inverted frustum-shaped cavity are provided with demagnetizing coil holes for wires to be led out.

[0011] The demagnetizing coil hole has a circular protrusion structure to reduce the penetration of external magnetic fields at the opening and improve the integrity of magnetic shielding.

[0012] Including the following expressions:

[0013]

[0014] in, Indicates overall magnetic field noise. Disturbance from external and environmental magnetic fields, The intrinsic noise introduced by the irregularly shaped high shielding factor passive layer. This is the overall shielding factor.

[0015] The technical effects of this invention are as follows: The irregularly shaped passive magnetic shielding system for miniaturized atomic spin gyroscopes of this invention aims to meet the requirements of small size and the ability to suppress measurement errors caused by external magnetic fields, thereby improving the accuracy and stability of SERF atomic gyroscopes. It consists of an irregularly shaped high shielding factor shielding layer, low-profile support, and mounting accessories. The irregularly shaped high shielding factor shielding layer employs an irregular design to reduce remanent magnetization and its gradient, while meeting the small size requirements of miniaturized gyroscopes, thus providing a weak magnetic environment for the miniaturized SERF atomic spin gyroscope.

[0016] This invention provides a passive magnetic shielding system with a reasonable structure and superior performance. In response to the miniaturization and high precision requirements of miniaturized SERF atomic gyroscopes, it adopts a non-standard high shielding factor shielding layer design, which significantly improves the magnetic shielding effect and the uniformity of the internal magnetic field, providing a reliable technical guarantee for the realization of high-precision gyroscopes. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the irregularly shaped passive magnetic shielding system structure of the miniaturized atomic spin gyroscope that implements the present invention.

[0018] The reference numerals in the attached diagram are explained as follows: 1-Irregularly shaped high shielding factor shielding layer; 2-Wafer ring; 3-Laser light transmission hole (with a protruding truncated cone on its outer side to reduce the penetration of external magnetic fields at the opening); 4-Sensitive core; 5-Demagnetizing coil hole. Detailed Implementation

[0019] The following is in conjunction with the attached diagram ( Figure 1 The present invention will be described in conjunction with the examples.

[0020] Figure 1 This is a schematic diagram of the irregularly shaped passive magnetic shielding system structure for implementing the miniaturized atomic spin gyroscope of the present invention. (Reference) Figure 1 As shown, the irregular passive magnetic shielding system of the miniaturized atomic spin gyroscope includes an irregular space defined by an irregular high shielding factor shielding layer 1. The irregular space includes a cylindrical cavity, an upright frustum-shaped cavity that extends upward from the upper opening of the cylindrical cavity and contracts downward from the lower opening of the cylindrical cavity and contracts downward.

[0021] The irregular high shielding factor shielding layer 1 is made of permalloy material. The irregular high shielding factor shielding layer 1 has a multi-layer structure. The layers are isolated by spacers 2 to control the interlayer distance. The spacers 2 are made of magnetic insulating material to ensure interlayer insulation and reduce magnetic coupling effect.

[0022] The irregularly shaped high-shielding-factor shielding layer 1 controls the interlayer spacing via spacers 3, which are made of magnetically insulating material to ensure interlayer insulation and reduce magnetic coupling effects. The irregularly shaped space has transverse and longitudinal through-holes 3 leading to the outside of the irregularly shaped high-shielding-factor shielding layer 1. Both the upright frustum-shaped cavity and the inverted frustum-shaped cavity are provided with demagnetizing coil holes 5 for wire routing. The demagnetizing coil holes 5 have a circular protrusion structure to reduce the penetration of external magnetic fields at the opening and improve the integrity of the magnetic shielding.

[0023] Including the following expressions:

[0024]

[0025]

[0026] =

[0027]

[0028] in, Indicates overall magnetic noise. For environmental background noise, The noise term introduced for irregularly shaped high shielding factor shielding layers. This contributes to the noise generated by the low-noise magnetic shielding layer. The overall shielding coefficient, This is the passive shielding coefficient. The shielding coefficient of the irregular high-factor shielding layer. The shielding coefficient of the low-noise magnetic shielding layer. Primary-passive joint shielding coefficient is the active shielding coefficient of the triaxial magnetic field control coil.

[0029] This invention relates to an irregularly shaped passive magnetic shielding system for miniaturized SERF atomic spin gyroscopes. This magnetic shielding system aims to meet the requirements of small size while suppressing measurement errors caused by external magnetic fields, thereby improving the accuracy and stability of the SERF atomic spin gyroscope. It mainly consists of an irregularly shaped high shielding factor shielding layer, support components, and mounting accessories. The irregularly shaped high shielding factor shielding layer employs an irregular design to reduce remanence and its gradient while meeting the small size requirements of the miniaturized gyroscope, providing a weak magnetic environment for the miniaturized SERF atomic spin gyroscope.

[0030] A design method for an irregularly shaped passive magnetic shielding system for miniaturized atomic spin gyroscopes is disclosed. The structure of the high shielding factor shielding layer is optimized, and an irregularly shaped structure is designed in the SERF atomic gyroscope system to shield external residual magnetism, which can effectively improve the magnetic field uniformity inside the shield and reduce residual magnetism and magnetic field gradient.

[0031] The total magnetic noise of the magnetic shielding device consists of the magnetic noise of the remaining high shielding factor shielding layer itself after being shielded by the irregular high shielding factor shielding layer.

[0032] The magnetic shielding device optimizes the structure and size of the magnetic open boundary. The structure adds a frustum-shaped protrusion and the height and the upper and lower radii of the frustum are designed based on the shielding layer thickness and the interlayer gap to reduce the external magnetic field introduced by the magnetic open boundary.

[0033] A design method for an irregularly shaped passive magnetic shielding system for miniaturized atomic spin gyroscopes is presented. To meet the miniaturization and high precision requirements of miniaturized SERF atomic gyroscopes, an irregularly shaped high shielding factor shielding layer is designed, and an efficient magnetic shielding system is constructed, which realizes effective shielding of external magnetic fields and precise control of internal magnetic fields.

[0034] Structural optimization: An irregular shape design is adopted to meet the requirements of small volume, reduce the residual magnetism effect, and improve the magnetic shielding effect.

[0035] Multi-layer structure: The shielding cover has a multi-layer structure, with each layer isolated by gaskets to control the distance between layers and ensure the insulation and mechanical stability between layers.

[0036] Special opening design: The shielding cover has two pairs of laser light transmission holes, one three-axis magnetic field control coil wiring hole, and four pairs of demagnetizing coil wiring holes. The openings have a circular raised structure to reduce the penetration of external magnetic fields at the openings and improve the integrity of the magnetic shielding.

[0037] Insulation isolation: The magnetic noise shielding layer and the low magnetic noise shielding layer are isolated by a gasket ring to control the distance between them, ensure electrical insulation, and reduce magnetic coupling effects.

[0038] Material selection: The coil uses silver-clad copper wire, which has excellent conductivity and stability, improving the accuracy and response speed of magnetic field control.

[0039] Fixing and positioning mechanism: Component positioning utilizes fixing bolts and washers to achieve precise positioning of the irregularly shaped high shielding factor shielding layer, low magnetic noise magnetic shielding layer, and triaxial magnetic field control coil bracket. Installation accuracy: Each component has through holes for positioning pins to ensure accurate alignment and secure connection of components during installation, improving system reliability.

[0040] Magnetic Noise Analysis and Calculation: The total magnetic noise of a magnetic shielding system consists of the following components: Ambient magnetic noise: The magnetic noise remaining after shielding by the irregularly shaped high shielding factor shielding layer; Magnetic noise of the irregularly shaped high shielding factor shielding layer itself: The formula for calculating the total magnetic noise is:

[0041]

[0042] in For total magnetic noise, For environmental magnetic noise, It is magnetic noise generated by the irregularly shaped high shielding factor shielding layer. Reference for the shielding coefficient of irregularly shaped high shielding factor shielding layers Figure 1 As shown, the magnetic shielding system of the present invention includes components such as an irregularly shaped high shielding factor shielding layer 1, a gasket ring 2, and a triaxial magnetic field control coil 4.

[0043] Irregularly shaped high shielding factor shielding layer 1:

[0044] The irregularly shaped high shielding factor shielding layer employs an irregular design to meet the requirements of miniaturized SERF atomic gyroscopes for small size and low remanence. The shielding cover has a multi-layered structure (e.g., three layers), with each layer separated by spacers 2. These spacers control the distance between layers, ensuring interlayer insulation and mechanical stability. The irregularly shaped high shielding factor shielding layer features:

[0045] Two pairs of laser light-passing holes 3 are used for the entry and exit of the laser beam.

[0046] Four pairs of demagnetizing coil routing holes 5 are used for leading out the wires of the demagnetizing coil.

[0047] Circular protrusions were designed in these openings to reduce the penetration of external magnetic fields and improve the magnetic shielding effect.

[0048] Working principle of magnetic shielding system: This invention achieves effective shielding of external magnetic fields and precise control of internal magnetic fields through irregularly shaped high shielding factor shielding layer 1.

[0049] Passive magnetic shielding: The irregularly shaped high shielding factor shielding layer and the low magnetic noise magnetic shielding layer have high permeability, which can absorb and deflect external magnetic fields, reducing the magnetic field strength inside the shielding enclosure. The multi-layer structure and irregular design further improve the shielding effect and reduce residual magnetism and magnetic field gradient.

[0050] Example: In practical applications, firstly, based on the size requirements of the miniaturized SERF atomic gyroscope, the irregular structure and number of layers of the irregular high shielding factor shielding layer 1 are designed. An appropriate irregular high shielding factor shielding layer material (such as permalloy) is selected to fabricate a multi-layer shield, with the thickness and spacing of each layer controlled by spacers 2. During assembly, fixing bolts and locating pins are used to ensure accurate positioning and tight connection of each component. A laser beam is introduced through the laser aperture 3 to excite and detect the atomic gyroscope.

[0051] Application Results: Through the above design and implementation, the magnetic shielding system of this invention can effectively reduce magnetic noise inside the shielding enclosure, providing a uniform and stable weak magnetic environment, meeting the high-precision measurement requirements of miniaturized SERF atomic gyroscopes. Experimental results show that after using this magnetic shielding system, the measurement accuracy and stability of the gyroscope are significantly improved, and remanence and magnetic field gradients are effectively controlled.

[0052] Precautions:

[0053] Material selection: The magnetic properties of irregularly shaped high shielding factor shielding layers have a significant impact on the shielding effect. High-quality materials should be selected to ensure magnetic permeability and processing precision.

[0054] Manufacturing process: The processing and assembly of the shielding cover should be carried out in a non-magnetic or low-magnetic environment to avoid introducing residual magnetism. The surfaces of each component should be properly treated to prevent oxidation and corrosion.

[0055] Demagnetization treatment: After assembly, the entire magnetic shielding system is demagnetized to further reduce residual magnetism and improve magnetic shielding performance.

[0056] Conclusion: This invention provides a magnetic shielding system with a reasonable structure and superior performance. Addressing the miniaturization and high precision requirements of miniaturized SERF atomic gyroscopes, it employs an irregularly shaped high shielding factor shielding layer design, significantly improving the magnetic shielding effect and the uniformity of the internal magnetic field, thus providing a reliable technical guarantee for the realization of high-precision gyroscopes.

[0057] Contents not described in detail in this specification are prior art known to those skilled in the art. It is hereby indicated that the above description is intended to help those skilled in the art understand this invention, but does not limit the scope of protection of this invention. Any equivalent substitutions, modifications, improvements, and / or simplifications of the above descriptions that do not depart from the essential content of this invention fall within the scope of protection of this invention.

Claims

1. An irregularly shaped passive magnetic shielding system for a miniaturized atomic spin gyroscope, characterized in that, The irregular space is defined in the irregular high shielding factor shielding layer. The irregular space includes a columnar cavity, an upright frustum-shaped cavity that extends upward from the upper opening of the columnar cavity and contracts downward, and an inverted frustum-shaped cavity that extends downward from the lower opening of the columnar cavity and contracts downward.

2. The irregularly shaped passive magnetic shielding system for a miniaturized atomic spin gyroscope according to claim 1, characterized in that, The irregular high shielding factor shielding layer has a multi-layer structure, with the layers separated by spacers to control the interlayer distance. The spacers are made of magnetic insulating material to ensure interlayer insulation and reduce magnetic coupling effects.

3. The irregularly shaped passive magnetic shielding system for a miniaturized atomic spin gyroscope according to claim 1, characterized in that, The irregular high shielding factor shielding layers are isolated by spacers to control the interlayer distance. The spacers are made of magnetically insulating material to ensure interlayer insulation and reduce magnetic coupling effects.

4. The irregularly shaped passive magnetic shielding system for a miniaturized atomic spin gyroscope according to claim 1, characterized in that, The irregular space has transverse and longitudinal through-laser apertures leading to the outside of the irregular high shielding factor shielding layer.

5. The irregularly shaped passive magnetic shielding system for a miniaturized atomic spin gyroscope according to claim 1, characterized in that, Both the upright frustum-shaped cavity and the inverted frustum-shaped cavity are provided with demagnetizing coil holes for wires to be led out.

6. The irregularly shaped passive magnetic shielding system for a miniaturized atomic spin gyroscope according to claim 5, characterized in that, The demagnetizing coil hole has a circular protrusion structure to reduce the penetration of external magnetic fields at the opening and improve the integrity of magnetic shielding.

7. The irregularly shaped passive magnetic shielding system for a miniaturized atomic spin gyroscope according to claim 1, characterized in that, Including the following expressions: in It is the total magnetic noise. It is environmental magnetic noise. It is magnetic noise generated by the irregularly shaped high shielding factor shielding layer. It is the total shielding coefficient.

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