Multi-Wavelength LED Photodiode Array for Object State Detection
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Solution Overview
Problem
Conventional optical sensors using monochromatic light struggle to detect colors and provide limited information about objects, while cameras relying on red, green, and blue light also face limitations in acquiring comprehensive object data.
Innovation Solution
An electronic apparatus employing a light-emitting diode array that transmits a plurality of light beams with different wavelengths, coupled with a photodiode array to receive and process these beams, allowing for the identification of object states, cooking information, and detection of rotten food through analysis of reflection intensities and wavelengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If monochromatic light is used in optical sensors, then the device complexity is reduced, but the measurement precision and information acquisition capability deteriorate
Solution Approach 1:
The optical sensor is segmented into multiple photodetectors, each responsible for detecting specific wavelength bands. The light source is also segmented into multiple LEDs emitting different wavelengths. This segmentation allows simultaneous multi-wavelength detection without requiring a single complex sensor, thus improving measurement precision while maintaining manageable device complexity.
Solution Approach 2:
The system transitions from single-wavelength detection to multi-wavelength detection by adding the wavelength dimension. Multiple photodetectors are arranged to detect different wavelength bands simultaneously, converting a one-dimensional detection problem into a multi-dimensional one, thereby significantly improving object state identification accuracy.
2Loss of information
If a camera using red, green, and blue light is used, then color detection capability is improved, but the quantity of information acquired about the object remains limited
Solution Approach 1:
The system changes the wavelength parameters by using more than three wavelengths (including infrared and other bands beyond RGB). This parameter expansion allows detection of object properties that cannot be captured by visible light alone, such as internal temperature, moisture content, and chemical composition, thereby reducing information loss and improving detection versatility.
3Measurement precision
If multiple wavelengths are used to improve object identification, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
Multiple LEDs emitting different wavelengths are merged into a single light emitter assembly, and multiple photodetectors detecting different wavelength bands are merged into an integrated receiver module. This merging approach maintains measurement precision through multi-wavelength detection while reducing overall device complexity compared to using separate systems for each wavelength.
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
Enables accurate identification of object states and determination of food freshness or cooking completion by analyzing the reflection intensities of multiple wavelengths, providing more comprehensive information than traditional methods.
Implementation Method 1
a light-emitting diode array that transmits a plurality of light beams with different wavelengths
Implementation Method 2
a photodiode array that receives light beams
Implementation Method 3
analysis of reflection intensities and wavelengths
Data Source
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AI summary
Disclosed herein is an electronic apparatus and method capable of identifying a state of an object. The electronic apparatus includes a light-emitting diode array configured to transmit light beams having different wavelengths, a photodiode array configured to receive the light beams, a display, and a processor configured to control the light-emitting diode array to transmit the light beams having the different wavelengths toward an object, identify a state of the object based on intensities reflected on the object according to the light beams having the different wavelengths that are received by the photodiode array, and display information about the state of the object on the display.