UV Light Receiver Filter Layout for Harmful Wavelength Detection
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Solution Overview
Problem
Existing ultraviolet sterilization devices fail to completely remove harmful ultraviolet light in the wavelength range of 230 nm to 400 nm due to degradation of bandpass filters or absorption members, leading to unnoticed exposure to harmful radiation.
Innovation Solution
An ultraviolet ray receiving and emitting device is designed with a light source emitting at 220-230 nm, a filter attenuating 220-230 nm light while transmitting 230-320 nm light, and a light receiving portion sensitive to both ranges, allowing efficient detection of ultraviolet light in the 230-400 nm band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a bandpass filter or ultraviolet absorption member is used to block ultraviolet light in the wavelength range of 230 to 300 nm, then the emission of harmful ultraviolet light is suppressed, but the filter or absorption member degrades over time allowing harmful ultraviolet light to leak through
Solution Approach 1:
The patent employs a feedback mechanism where a photodetector continuously monitors the intensity of ultraviolet light in the 230-300 nm range. When the detected intensity exceeds a predetermined threshold, the system automatically adjusts the drive current to the ultraviolet LED to reduce emission intensity, thereby maintaining safety even as the filter degrades over time
Solution Approach 2:
The system performs self-monitoring and self-adjustment of ultraviolet light emission. The control unit uses feedback from the photodetector to autonomously regulate the LED drive current, eliminating the need for manual intervention or replacement of degraded filters, thus enabling the system to maintain its own safety performance
2Object-affected harmful factors
If ultraviolet light in the wavelength range of 230 to 400 nm is completely blocked, then human body exposure is prevented, but detection of harmful radiation becomes difficult since this ultraviolet light is not visible
Solution Approach 1:
The patent introduces a photodetector as an intermediary device that converts invisible ultraviolet light in the 230-300 nm range into detectable electrical signals. This mediator enables the system to perceive and measure harmful ultraviolet radiation that would otherwise be undetectable to human senses
Solution Approach 2:
The system replaces human visual detection with an electronic photodetector-based detection system. The photodetector electronically measures ultraviolet light intensity and converts it into measurable electrical signals, substituting the inadequate human visual system with a sensitive electronic detection mechanism
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
This configuration enables effective detection and monitoring of harmful ultraviolet light in the 230-400 nm range, ensuring safety by reducing the intensity of 220-230 nm light and enhancing the detection of more harmful wavelengths, thereby preventing exposure to hazardous radiation.
Implementation Method 1
a filter that attenuates light in a wavelength band of 220 nm or more and less than 230 nm and transmits at least a part of a wavelength band of 230 nm or more and less than 320 nm
Implementation Method 2
a light receiving portion having sensitivity to both of light in a wavelength band of 220 nm or more and less than 230 nm and light in a wavelength band of 230 nm or more and less than 400 nm
Data Source
AI summary
The ultraviolet light that is harmful to the human body is efficiently detected to detect a risk. An ultraviolet ray receiving device includes a light source that emits light having a central wavelength of 220 nm or more and less than 230 nm, a filter that attenuates light in a wavelength band of 220 nm or more and less than 230 nm and transmits at least a part of a wavelength band of 230 nm or more and less than 320 nm, and a light receiving portion having sensitivity to both of light in a wavelength band of 220 nm or more and less than 230 nm and light in a wavelength band of 230 nm or more and less than 400 nm in which a band of light that transmits through the filter overlaps at least a part of a band that the light receiving portion has sensitivity.