Hall Sensor Measurement Cell With Mechanical Decoupling
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Solution Overview
Problem
Existing measurement devices for the distance between parallel surfaces of an object are prone to disruption due to interactions with the object, such as vibrations and deformations, leading to inaccurate measurements and high installation and repositioning costs.
Innovation Solution
A device with a hermetic measurement cell containing a sealed cavity filled with air, using a Hall effect sensor and a permanent magnetic field source, mechanically isolating the measuring apparatus from the measurement surface by a sealed cavity with a homothetic sealing part, and using non-metallic components to avoid interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the measurement device is attached directly to the ground with significant infrastructure, then the device can withstand high stresses from vehicles, but the installation becomes time-consuming and costly
Solution Approach 1:
The measurement device is segmented into a hermetic measurement cell that can be independently installed. This cell contains the Hall effect sensor and magnetic field source, separated from the ground infrastructure by an air gap, allowing modular installation without extensive ground work
Solution Approach 2:
An air gap acts as an intermediary between the measurement cell and the ground surface. This air gap mechanically decouples the sensor from ground stresses while maintaining measurement capability through the magnetic field, eliminating the need for direct mechanical attachment
2Strength
If the measurement device is attached directly to the ground with significant infrastructure, then the device can withstand high stresses from vehicles, but repositioning requires major work involving heavy equipment
Solution Approach 1:
The hermetic measurement cell is designed as a self-contained, relocatable unit that can be easily removed and repositioned without affecting ground infrastructure, enabling flexible deployment and reconfiguration
Solution Approach 2:
The air gap serves as a decoupling intermediary that allows the measurement cell to be freely positioned and repositioned without mechanical constraints from ground attachment, providing adaptability while maintaining stress resistance through magnetic field measurement
3Strength
If the sensor assembly is in direct contact with the measurement surface, then the device can withstand significant loads, but vibrations and deformations during measurement cause measurement disruption
Solution Approach 1:
An air gap acts as a mechanical intermediary that decouples the Hall effect sensor from vibrations and deformations of the measurement surface, while the magnetic field penetrates the air gap to maintain measurement capability, thus protecting precision without sacrificing load capacity
Solution Approach 2:
The mechanical connection between sensor and measurement surface is replaced by a magnetic field-based measurement system. The Hall effect sensor detects magnetic field changes caused by the measurement surface position, eliminating direct mechanical contact and its associated vibrations and deformations
4Stability of the object's composition
If the measurement device uses traditional fastening systems, then the components can be assembled without play or vibration risk, but the assembly becomes extremely sensitive to deformations and movements during measurement
Solution Approach 1:
The mechanical fastening system is replaced by a magnetic field-based measurement system. The Hall effect sensor detects position through magnetic field changes rather than mechanical contact, eliminating the sensitivity to deformations and movements that plagues rigid mechanical assemblies
Solution Approach 2:
The air gap serves as a stabilizing intermediary that isolates the sensor assembly from mechanical deformations while the magnetic field provides a stable measurement reference that is insensitive to mechanical instabilities in the fastening system
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 device provides precise and robust measurements by isolating the apparatus from external stresses, extending service life, and reducing installation costs while maintaining measurement accuracy.
Implementation Method 1
an electronic circuit equipped with a Hall effect sensor, the output signal of which depends on the magnetic field generated
Implementation Method 2
a permanent magnetic field source
Implementation Method 3
The second surface of the said object, which is substantially parallel to the first surface of the said object, comprising a composition based on ferromagnetic materials
Data Source
AI summary
A device for measuring the distance between two substantially parallel surfaces of an object comprises an electronic apparatus with a Hall effect sensor. The device comprises a mechanical decoupling system which isolates the object to be measured from the measuring apparatus so as to eliminate interactions that can disrupt the measurement. This device can be applied to the measurement of the thickness of a layer of rubber for a tire, and more particularly to the measurement of the remaining thickness of a tread.