Vibratory Inertial Sensor Casing With Electroplated Magnetic Shielding
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Solution Overview
Problem
Existing vibratory mechanical resonator sensors, such as gyroscopes and accelerometers, are adversely affected by external magnetic fields due to electromagnetic interactions, leading to performance degradation, and conventional magnetic shielding methods are bulky, expensive, and unsuitable for small-size sensors, especially when exposed to high temperatures or complex configurations.
Innovation Solution
A method involving the use of galvanoplasty to deposit a ferromagnetic material layer on the casing of the sensor, combined with vacuuming or filling with dry gas, to create a magnetic shield that minimizes magnetic sensitivity while maintaining performance and compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional magnetic shielding methods are used, then magnetic protection is improved, but device weight and size increase
Solution Approach 1:
The patent applies galvanoplasty to deposit a ferromagnetic material layer on the casing, changing the magnetic properties of the casing surface. This creates an effective magnetic shield with much lower weight compared to conventional bulk magnetic shielding materials, as the protective function is achieved through a thin deposited layer rather than thick shielding components.
Solution Approach 2:
The patent replaces conventional mechanical magnetic shielding structures (such as bulky mu-metal enclosures or magnetic shields) with a galvanoplastically deposited ferromagnetic layer. This substitution transitions from a mechanical/structural shielding approach to a surface-coating approach, significantly reducing weight while maintaining shielding effectiveness.
2Object-affected harmful factors
If conventional magnetic shielding methods are used, then magnetic protection is improved, but manufacturing cost increases
Solution Approach 1:
The galvanoplasty process integrates the magnetic shielding function directly into the casing manufacturing sequence. The ferromagnetic material is deposited electrochemically onto the casing surface, combining the structural fabrication and magnetic shielding creation into a single self-contained process, eliminating the need for separate shielding component fabrication and assembly steps.
Solution Approach 2:
The patent merges the casing structure and magnetic shielding function into a single integrated component. The ferromagnetic layer deposited on the casing serves dual purposes: providing structural enclosure and creating the magnetic shield, thereby eliminating the need for separate shielding components and reducing overall manufacturing complexity and cost.
3Volume of moving object
If the sensor size is reduced, then compactness is improved, but conventional magnetic shielding becomes unsuitable
Solution Approach 1:
The patent changes the approach to magnetic shielding from bulk material to surface coating. By depositing a ferromagnetic layer via galvanoplasty, the shielding function is achieved with a thin surface layer rather than requiring thick bulk shielding materials, making it feasible to implement effective magnetic shielding in compact, small-size sensors where conventional shielding would be too large.
4Object-affected harmful factors
If a ferromagnetic material layer is deposited on the casing, then magnetic sensitivity is reduced, but the deposition process complexity increases
Solution Approach 1:
The galvanoplasty process is an established, standardized electrochemical deposition technique that can be integrated into existing manufacturing lines. The process automatically deposits the ferromagnetic material uniformly on the casing surface through electrochemical reactions, requiring minimal manual intervention or complex equipment beyond standard galvanoplasty apparatus.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method results in a lightweight, compact, and cost-effective inertial sensor with reduced magnetic sensitivity across a wide frequency spectrum, suitable for industrial implementation and maintaining measurement accuracy even in strong external magnetic fields.
Implementation Method 1
a first operation of depositing, by galvanoplasty, a first layer of a first ferromagnetic material on part at least of said casing
Implementation Method 2
magnetic shielding said casing, which includes a first operation of depositing, by galvanoplasty, a first layer of a first ferromagnetic material on part at least of said casing, to form a magnetic shield of said casing
Data Source
AI summary
A method for manufacturing a vibratory mechanical inertial sensor, sensor obtained by such a method and inertial unit including such a sensorThe invention relates to a method for manufacturing a vibratory inertial sensor (1), comprising a step of associating a test body (3) with a base (2), a step of assembling a cover (100) to said base (2) to form a casing within which said test body (3) is housed, a step of vacuuming said casing or filling the latter with a dry gas, and a step of magnetically shielding said casing that includes a first operation of depositing, by galvanoplasty, a first layer of a first ferromagnetic material on part at least of said casing.Vibratory inertial sensors