Infrared Probe Heater for Materials Testing
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Solution Overview
Problem
Existing heating arrangements for materials testing devices are bulky, result in significant thermal inertia, limited temperature range, and induce thermal expansion, affecting measurement accuracy and repeatability, and often generate electromagnetic interference.
Innovation Solution
A heating arrangement using an infrared emitting element and an ellipsoidal reflector with two focal points to focus infrared radiation precisely on the probe tip, minimizing thermal inertia and achieving higher temperatures, while a parabolic reflector ensures even sample heating without hotspots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If heating elements are integrated into the probe tip, then the probe tip can be heated to the required temperature, but the system becomes bulky and heats a relatively large amount of material, resulting in significant thermal inertia
Solution Approach 1:
The patent replaces conventional contact heating elements with infrared radiation heating. The infrared emitter directs radiation onto the probe tip, heating it without physical contact. This eliminates the need for bulky integrated heating elements while achieving the required temperature, thereby reducing thermal inertia and improving response time.
Solution Approach 2:
The patent introduces infrared radiation as an intermediary medium to transfer heat to the probe tip. Instead of direct thermal contact between heating elements and the probe, infrared radiation acts as a mediator that can be precisely directed and controlled, enabling localized heating with minimal thermal mass involvement.
2Temperature
If heating elements are integrated into the probe tip, then the probe tip can be heated, but the system becomes bulky and heating a large amount of material induces thermal expansion affecting measurement accuracy
Solution Approach 1:
The patent applies heating locally and selectively to the probe tip using infrared radiation. The radiation is directed precisely at the probe tip surface, heating only the necessary area without involving surrounding components. This localized heating minimizes thermal expansion in non-critical areas and maintains measurement accuracy.
Solution Approach 2:
By replacing contact-based heating with infrared radiation, the patent achieves localized heating without the mechanical bulk of integrated elements. This allows precise temperature control of the probe tip while keeping the surrounding system thermally stable, thereby maintaining measurement precision.
3Device complexity
If laser heating is used for the indentation tip, then the system remains compact, but the maximum temperature attainable is limited to approximately 500°C
Solution Approach 1:
The patent changes the parameters of the infrared emitter to operate at higher power levels and wavelengths optimized for high-temperature heating. By adjusting the emitter characteristics and controlling the irradiation intensity, the system can achieve temperatures exceeding 500°C while maintaining a compact form factor, unlike conventional laser heating limitations.
4Device complexity
If induction heating is used for the probe, then the system remains compact, but significant electromagnetic interference is generated affecting sensitive measurement devices
Solution Approach 1:
The patent substitutes induction heating (which relies on electromagnetic fields) with infrared radiation heating. This replacement eliminates the generation of significant electromagnetic interference that would affect sensitive measurement devices, while maintaining the compactness advantage of non-contact heating methods.
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 solution allows for precise and stable temperature control of the probe tip up to 1000°C, reducing thermal drift and improving measurement accuracy by minimizing thermal expansion and electromagnetic interference.
Implementation Method 1
a probe heater comprising an infrared emitting element adapted to emit infrared radiation
Implementation Method 2
a reflector having a reflective surface arranged to direct said infrared radiation towards a distal end of said surface measurement probe
Implementation Method 3
A heating arrangement using an infrared emitting element and an ellipsoidal reflector with two focal points to focus infrared radiation precisely on the probe tip
Implementation Method 4
a parabolic reflector ensures even sample heating without hotspots
Data Source
AI summary
Heating arrangement for a materials testing device, the materials testing device comprising at least one surface measurement probe adapted to be brought into contact with a surface of a sample, the heating arrangement comprising a probe heater comprising:an infrared emitting element adapted to emit infrared radiation;a reflector having a reflective surface arranged to direct said infrared radiation towards a distal end of said surface measurement probe.According to the invention, the reflector comprises a first focal point and a second focal point, the infrared emitting element being situated substantially at said first focal point.