IR Thermometer Tip Assembly Thermal Isolation Design
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Solution Overview
Problem
Infrared (IR) thermometers face measurement errors due to heat conduction through disposable covers, which are often made from thermally insulating materials to prevent cross-contamination, increasing costs and potentially introducing significant measurement errors.
Innovation Solution
An IR tip assembly with a thermally isolated shroud that accepts a low-cost disposable cover, featuring air gaps and ribbed structures to minimize heat conduction, along with a heat sink for effective thermal management, and optional airflow to further reduce temperature changes during measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermally insulating materials are used in disposable covers, then cross-contamination prevention is improved, but measurement precision deteriorates due to heat conduction through the cover
Solution Approach 1:
The disposable cover is segmented into multiple thin layers rather than using a single thick insulating layer. This segmentation reduces the overall thermal insulation while maintaining the barrier function against cross-contamination, thereby reducing measurement errors caused by heat conduction through the cover.
Solution Approach 2:
The disposable cover uses different material properties in different regions: the outer surface maintains adequate thermal insulation to prevent heat conduction from the ear canal, while the inner surface is designed with lower insulation properties to minimize interference with the IR sensor's thermal measurements. This local differentiation resolves the contradiction between contamination prevention and measurement accuracy.
2Reliability
If thermally insulating materials are used in disposable covers, then cross-contamination prevention is improved, but device cost increases
Solution Approach 1:
The cover is divided into multiple thin layers instead of using one thick insulating layer. This segmentation allows the use of cheaper materials and reduces material costs while still providing adequate barrier protection against cross-contamination.
Solution Approach 2:
The invention uses inexpensive, disposable materials for the cover that can be discarded after single use. By selecting cost-effective materials and simplifying the cover structure, the invention reduces the cost of disposable covers while maintaining their primary function of preventing cross-contamination.
3Ease of manufacture
If thin low-cost disposable covers are used, then device cost is reduced, but heat conduction through the cover increases causing measurement errors
Solution Approach 1:
The thin cover is segmented into multiple layers with varying thermal properties. This segmentation allows the overall cover to remain thin and low-cost while strategically positioned layers provide thermal management to reduce heat conduction interference with measurements.
Solution Approach 2:
The disposable cover uses composite material construction combining materials with different thermal properties. This composite structure enables the cover to be thin and inexpensive while maintaining adequate thermal isolation to prevent measurement errors from heat conduction.
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 solution provides effective thermal isolation, reducing measurement errors and maintaining accuracy while keeping costs low by using thin, low-cost disposable covers and enhancing the safety against cross-contamination.
Implementation Method 1
A heat sink is mechanically and thermally coupled to the IR sensor base
Implementation Method 2
When the disposable cover is attached to the shroud, at least one air gap is defined between the shroud and the disposable cover
Data Source
AI summary
An IR tip assembly includes a shroud having at least one feature that permits releasable attachment of a disposable cover fitted to a shroud. When the disposable cover is fitted to the shroud, at least one air gap is defined between the shroud and the disposable cover. An IR sensor disposed within the IR tip assembly is mechanically and thermally coupled to a heat sink. The at least one defined air gap creates a thermal isolation between the disposable cover and the disposed IR sensor. There can also be airflow through the at least one air gap. Apparatus and methods to create the airflow are described.