Standard Radiation Source Shielding Plate Thermal Uniformity
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Solution Overview
Problem
Cavity-shaped black bodies used as standard radiation sources in non-contact temperature measurement techniques suffer from poor temperature uniformity due to environmental temperature variations, leading to imprecise calibrations.
Innovation Solution
A standard radiation source design featuring a cavity-shaped black body with a shielding plate, multiple heaters, insulation devices, and a temperature-controlling system to minimize thermal exchange with the environment, ensuring stable temperature calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an open cavity design is used for the black body, then the device complexity is reduced and ease of manufacture is improved, but the temperature uniformity deteriorates due to thermal exchange with the environment
Solution Approach 1:
The patent introduces a shielding plate as an intermediary component positioned at the open end of the cavity. This shielding plate acts as a mediator between the cavity interior and the external environment, reducing direct thermal exchange while maintaining the open cavity design for ease of manufacture. The shielding plate effectively isolates the cavity from environmental temperature variations without requiring a fully enclosed complex structure.
2Stability of the object's composition
If the cavity is isolated from the environment to prevent thermal exchange, then the temperature uniformity is improved, but the device complexity increases due to additional insulation and control components
Solution Approach 1:
The patent applies local quality by positioning the shielding plate specifically at the open end of the cavity where thermal exchange with the environment occurs most significantly. Instead of insulating the entire cavity structure uniformly, the shielding plate provides localized thermal isolation at the critical interface, achieving temperature uniformity improvement with minimal additional complexity.
Solution Approach 2:
The patent employs temperature-controlling devices that actively adjust and maintain the cavity temperature by compensating for environmental thermal exchange. This dynamic parameter control allows the system to maintain temperature uniformity despite the open cavity design, balancing the trade-off between isolation and complexity through active thermal management.
3Device complexity
If no shielding plate is used, then the device complexity is reduced, but the resistance to environmental temperature variations deteriorates
Solution Approach 1:
The shielding plate serves as a protective intermediary that blocks direct thermal exchange between the cavity and the external environment. This simple yet effective mediator component significantly enhances the cavity's resistance to environmental temperature variations without introducing complex insulation systems or active control mechanisms.
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 a stable and precise radiation temperature, resistant to environmental variations, enabling accurate temperature calibration of ear thermometers.
Implementation Method 1
at least one first heater positioned in the shielding plate
Implementation Method 2
at least one second heater positioned on the outer wall of the black body
Implementation Method 3
a first insulation device covering the second heater
Implementation Method 4
All objects with temperature above absolute zero emit radiation, which can be measured by non-contact techniques for evaluating the temperature of the objects
Data Source
AI summary
The present standard radiation source comprises a black body having a cavity, a shielding plate positioned at an open end of the cavity, at least one first heater positioned in the shielding plate, at least one second heater positioned on the outer wall of the black body, a first insulation device covering the second heater and a temperature-controlling device positioned on the first insulation device.