Adjustable Sample Holder Apertures for Accurate Thermal Conductivity Testing
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Solution Overview
Problem
Existing devices for determining thermal conductivity are prone to measurement falsification due to uncontrolled reflection of energy pulses from the light source and emitted radiation, which can interfere with the detector, affecting the accuracy of the measurement results.
Innovation Solution
The device incorporates adjustable apertures on the front and rear sides of the sample holder, designed as irises with movable blades, to shade interfering sections of the holder and irrelevant edge regions, ensuring precise positioning and alignment of the sample, thereby minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the light energy beam is applied to the front side of the sample without apertures, then the measurement process is simple, but the energy pulse is reflected uncontrolled from the sample holder and falsifies the measurement result
Solution Approach 1:
The patent introduces adjustable apertures as intermediary elements between the light source and the sample/sample holder. These apertures act as mediators that selectively block harmful reflections from the sample holder while allowing the necessary light beam to pass through to the sample, thereby improving measurement accuracy without fundamentally changing the measurement principle
Solution Approach 2:
The patent divides the light path into separate controllable sections using adjustable apertures. The first aperture segments the path from the light source to the sample, while the second aperture segments the path from the sample to the detector. This segmentation allows independent control of each section to eliminate interference while maintaining measurement functionality
2Adaptability or versatility
If the sample holder structure is extended to support various samples, then the device becomes more versatile, but the uncontrolled reflection from extended holder sections increases measurement errors
Solution Approach 1:
The patent employs adjustable (dynamic) apertures that can be repositioned and resized to match different sample configurations. This dynamic adjustment capability allows the apertures to adapt to various sample holder extensions while continuously blocking reflections, thereby maintaining measurement accuracy across different sample types and holder configurations
Solution Approach 2:
The patent applies apertures at specific locations where reflections are most problematic - the first aperture at the front side to block reflections from the holder structure before they reach the sample, and the second aperture at the rear side to block reflections before they reach the detector. This localized application of apertures针对性地 addresses reflection issues without requiring changes to the entire holder structure
3Measurement precision
If the aperture size is fixed, then the device structure is simpler, but it cannot effectively shade interfering sections for different sample geometries
Solution Approach 1:
The patent implements adjustable apertures that can dynamically change their size and position. This dynamic capability allows the apertures to be optimized for each specific measurement configuration, ensuring maximum blocking effectiveness for different sample geometries while maintaining a relatively simple overall device structure
Solution Approach 2:
The patent allows the apertures to be pre-adjusted before each measurement to the optimal position and size for that specific sample configuration. This preliminary adjustment ensures that the apertures are properly positioned to block reflections before the measurement begins, improving accuracy without requiring complex real-time adjustment mechanisms during measurement
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 adjustable apertures effectively reduce measurement errors by blocking unwanted reflections and ensuring accurate determination of thermal conductivity, heat capacity, and comparable thermal indices.
Implementation Method 1
The energy pulse from a light source 1, usually a flash lamp or a laser, heats the front side 3 of a sample 2
Implementation Method 2
A detector 5, usually in the form of an IR sensor, is arranged behind the sample as seen in the direction of irradiation. This detector 5 records the time-dependent temperature increase at the rear side 4 of the sample on the basis of the radiation emitted by the sample
Implementation Method 3
A falsification can result from the fact that the energy pulse of the light source 1 also partially hits the sample holder and is reflected from there in an uncontrolled manner
Data Source
AI summary
A device for determining the temperature conductivity, the heat capacity and/or the thermal conductivity of a material sample. The device has a light emitter for exposing a front side of the sample to a light energy beam and a radiation detector for determining the temperature rise at a rear side of the sample facing away from the front side by detecting the radiation emitted there as a function of temperature, and a sample holder for holding the sample in a defined position.