Refrigerated Display Light Filtering for Perishable Food Protection
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Solution Overview
Problem
Refrigerated food display cases expose perishable items to harmful light spectra, such as ultraviolet and infrared radiation, leading to reduced shelf life, discoloration, and bacterial growth, which negatively impacts food safety and appearance.
Innovation Solution
A refrigerated display case with a transparent color filter that absorbs ultraviolet and infrared light while allowing specific visible light ranges to pass through, protecting perishable foods from harmful light frequencies and maintaining clarity for product visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If ambient daylight and artificial lighting are used to illuminate the display case, then product visibility and attractiveness to shoppers is improved, but harmful ultraviolet and infrared radiation damages the perishable food products
Solution Approach 1:
A light filtering panel is introduced as an intermediary component between the light source and the food products. This panel selectively transmits visible light wavelengths while blocking harmful ultraviolet and infrared radiation, thereby mediating the interaction between light and food to achieve both illumination and protection
Solution Approach 2:
The light filtering panel utilizes optical properties to selectively transmit certain wavelengths of light while blocking others. By controlling which wavelengths pass through, the system maintains beneficial visible light for product display while filtering out harmful radiation wavelengths
2Illumination intensity
If bright artificial lighting is used inside the display case, then product visibility is improved, but surface heating and photochemical processes cause discoloration and oxidation
Solution Approach 1:
The light filtering panel acts as a mediator that modifies the spectral composition of light reaching the food products, reducing the energy content that causes heating while maintaining visible illumination for product display
Solution Approach 2:
The system changes the spectral parameters of the light by selectively filtering specific wavelength ranges. This parameter modification reduces the thermal and photochemical effects while preserving the illuminating function
3Loss of information
If the display case uses transparent viewing panels, then product visibility to customers is improved, but harmful exterior light enters and damages the food products
Solution Approach 1:
The light filtering panel serves as an intermediary layer within the viewing panel assembly, allowing customers to see through the panel while simultaneously filtering out harmful ultraviolet and infrared radiation from exterior light sources
Solution Approach 2:
The viewing panel is given different local qualities - it is transparent to visible light wavelengths for customer viewing, but opaque to harmful ultraviolet and infrared wavelengths, creating spatially selective optical properties
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 extends the shelf life and improves the appearance of perishable foods by reducing light-induced damage, thereby reducing shrinkage and enhancing sales through better product presentation.
Implementation Method 1
A refrigerated display case with a transparent color filter that absorbs ultraviolet and infrared light while allowing specific visible light ranges to pass through
Data Source
AI summary
A refrigerated display merchandiser in which is stored food products and which is ordinarily exposed to prevailing ambient light is provided with transparent sheets which function as filter media to prevent harmful light from reaching the foods stuffs. The filtering media comprises a transparent sheet affixed to the display merchandiser as well as about any fluorescent lighting disposed within the merchandiser. A transparent sheet passes either red or blue light or alternatively, absorbs ultraviolet light including both UV-A light and UV-B light.