Infrared Temperature Sensor Ventilation for Film Deformation
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Solution Overview
Problem
Conventional infrared temperature sensors experience film deformation due to expanding air in sealed spaces, leading to increased internal pressure and variations in infrared light and heat radiation, which affect measurement accuracy.
Innovation Solution
Incorporating a ventilation portion with through holes in the case and film to allow air permeation, reducing internal pressure and deformation, while maintaining the sealed space, and using thermally sensitive elements on the film for accurate temperature measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the space is sealed to protect the film and heat-sensitive elements, then the structural integrity and protection of components is improved, but the internal pressure increases when ambient temperature rises causing film deformation
Solution Approach 1:
The patent introduces a ventilation portion with through-holes in the case that allows air permeation between the sealed space and the outside environment. This porous structure enables pressure equalization while maintaining the sealed protective environment, preventing film deformation caused by thermal expansion of trapped air.
2Shape
If the ventilation portion is added to allow air permeation, then the film deformation is reduced, but the sealed space structure is compromised
Solution Approach 1:
The ventilation portion is designed as a controlled porous structure with through-holes in the case, allowing selective air permeation while maintaining the overall sealed space configuration. This resolves the contradiction by enabling pressure equalization without compromising the protective sealed environment.
3Measurement precision
If the film is sealed tightly to maintain sensor accuracy, then the measurement precision is improved, but the internal pressure causes wiring pattern cutting and sensor output variation
Solution Approach 1:
The ventilation portion with through-holes provides a pressure release mechanism that prevents harmful effects of internal pressure buildup, including wiring pattern cutting and film deformation that causes output variation, while maintaining the sealed space necessary for accurate temperature 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 solution effectively reduces film deformation and enhances measurement accuracy, ensuring reliable operation of infrared temperature sensors across varying temperature conditions.
Implementation Method 1
a film absorbing infrared light
Implementation Method 2
an infrared-detection heat-sensitive element disposed on the film within the space
Data Source
AI summary
Provided are: an infrared temperature sensor which is reduced in film deformation and achieves higher accuracy, while ensuring reliability; and a device which uses this infrared temperature sensor. An infrared temperature sensor is provided with: a film which absorbs infrared light; a case which covers and holds the film so as to form airtight spaces between itself and the film, and which is provided with a light guide part that has an opening and guides infrared light and a shielding part that has a shielding wall and shields infrared light; ventilation portion which allow air permeation between the spaces and the outside; a heat-sensitive element for infrared detection, which is arranged on the film at a position that corresponds to the light guide part; and a heat-sensitive element for temperature compensation, which is arranged on the film at a position that corresponds to the shielding part.