Cylindrical Sensor Fastening Region for Thermal Expansion Compensation
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Solution Overview
Problem
Cylindrical sensors for distance and position measurement face measurement errors due to undefined clamping locations and temperature-induced expansion, especially in precision measurements where thermal expansion of the sensor and clamping device cannot be neglected.
Innovation Solution
A sensor with an essentially cylindrical housing featuring a defined fastening region on its surface, which allows for a force-fitting connection exclusively with a fastening device, enabling precise determination and compensation of temperature-related expansion errors by accurately defining the clamping location.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional clamping without defined fastening regions is used, then the sensor can be easily mounted, but the clamping location is undefined leading to measurement errors due to thermal expansion
Solution Approach 1:
The sensor housing is segmented into distinct functional regions: a fastening region with defined geometry for precise clamping location, and a sensor element region for measurement. This segmentation allows the fastening region to be optimized for precise positioning while the sensor element maintains its measurement functionality, resolving the contradiction between measurement precision and device complexity.
Solution Approach 2:
The fastening region is designed with specific local geometric properties (raised portion or recess) that differ from the rest of the housing. This local quality enhancement provides a defined clamping location for precise measurement, while the overall sensor housing remains relatively simple. The local modification enables accurate thermal expansion compensation without requiring complete redesign of the entire sensor structure.
2Measurement precision
If the sensor housing material has low thermal expansion coefficient, then thermal expansion errors are reduced, but the sensor becomes more sensitive to clamping location variations
Solution Approach 1:
The fastening region is designed in advance with a defined geometric structure (raised portion or recess) that pre-establishes the exact clamping location before measurement begins. This preliminary definition of the clamping position eliminates uncertainties during measurement, allowing the use of low thermal expansion materials without compromising measurement precision due to clamping location variations.
3Reliability
If a defined fastening region is added to the sensor housing, then the clamping location is precisely defined enabling thermal expansion compensation, but the manufacturing complexity increases
Solution Approach 1:
The housing is segmented into a fastening region and sensor element region, allowing the fastening region to be manufactured with standard machining operations (forming raised portions or recesses) while the sensor element is installed separately. This segmentation enables reliable thermal expansion compensation through precise fastening location definition, while maintaining ease of manufacture by using conventional manufacturing techniques for the fastening region.
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
This design ensures reliable and accurate measurements across varying temperatures by reproducibly determining the clamping location, minimizing measurement errors caused by thermal expansion, and allowing for precise compensation in the measurement system.
Implementation Method 1
a sensor element operating according to the inductive, capacitive or eddy current principle
Implementation Method 2
a sensor element operating according to the inductive, capacitive or eddy current principle
Implementation Method 3
a sensor element operating according to the inductive, capacitive or eddy current principle
Implementation Method 4
If the temperature rises, the sensor expands with the typical material-specific expansion coefficient of the housing, starting from the clamping point. At the same time, the clamping device also expands due to its own material-specific expansion coefficient
Data Source
AI summary
A sensor for distance and/or position measurement has an essentially cylindrical housing and a sensor element operating according to the inductive, capacitive, or eddy current principle, which sensor element is arranged at least partially in the housing, wherein at least one fastening region is formed on the surface of the housing, which fastening region extends around the housing in the circumferential direction and is arranged as a raised portion or as a recess, wherein the housing is connectable in a force-fitting manner exclusively with the fastening region to a fastening device. Furthermore, a system including of such a sensor and a fastening device is shown.