Dilatometer Optical Measurement Induction Heating
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Solution Overview
Problem
Conventional dilatometers for measuring metallic samples suffer from temperature gradients due to heat transfer at clamping surfaces, leading to inaccurate measurements of length changes, especially during phase transformations, as the phase transition may not occur simultaneously across the sample, and asymmetries in the induction field exacerbate these issues.
Innovation Solution
A dilatometer design incorporating a contact-free optical measuring device to detect length changes and a thermocouple sensor positioned in the shadow of the optical measuring plane to measure temperature accurately, minimizing heat loss and interference, with an induction coil having a gap to accommodate the measuring plane perpendicular to the sample's longitudinal direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If contact-free optical measuring device is used to detect length changes, then measurement precision is improved and heat loss at measuring point is eliminated, but device complexity increases
Solution Approach 1:
The patent replaces contact-based mechanical measuring devices with a contact-free optical measuring device that uses light to detect length changes. This substitution eliminates heat loss at the measuring point and improves measurement precision, while the optical system provides non-contact measurement capability.
2Measurement precision
If temperature sensor is positioned in the shadow of the optical measuring device, then temperature measurement accuracy is improved without interfering with optical measurement, but device complexity increases
Solution Approach 1:
The patent positions the temperature sensor in the shadow region of the optical measuring device, utilizing the three-dimensional spatial arrangement to place both measurement systems in close proximity without interference. This dimensional positioning allows the temperature sensor to measure accurately while remaining outside the optical measurement path.
3Measurement precision
If induction coil has a gap to accommodate the measuring plane, then measurement accuracy is improved, but heating uniformity deteriorates
Solution Approach 1:
The induction coil is designed with a gap that segments the coil structure to accommodate the optical measuring plane. This segmentation allows the optical device to measure length changes accurately while the induction coil continues to provide heating, with the gap positioned to minimize interference with the measurement beam.
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
Enables precise temperature-dependent length measurements even with temperature gradients, reducing errors in phase transition detection and allowing for high-accuracy measurements during rapid heating and cooling processes.
Implementation Method 1
an induction coil arranged on the sample, the induction coil configured to heat the sample
Implementation Method 2
an optical measuring device for detecting a change in a length of the sample
Implementation Method 3
a sensor for measuring the temperature of the sample
Data Source
AI summary
A dilatometer for measuring metallic samples. The dilatometer includes a sample holder configured to receive and clamp a sample, an induction coil arranged on the sample, the induction coil configured to heat the sample, and a sensor for measuring the temperature of the sample.