SiC Detector Sunlight Detection UV Sensitivity
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Solution Overview
Problem
Existing methods for detecting sunlight are not sufficient in differentiating between sunlight and other light sources, such as street lamps or vehicle headlights, leading to interference and inaccurate control in applications like air conditioning systems.
Innovation Solution
A semiconductor detector arrangement using a SiC semiconductor detector with a low dopant concentration and a thick lower semiconductor region, specifically designed to be sensitive only to the UV portion of sunlight, allowing for high sensitivity and reliability in sunlight detection without interference from other light sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional sunlight detectors (Si, GaAs, InP) are used to detect sunlight intensity, then the detection sensitivity in the visible spectral range is improved, but the ability to differentiate between sunlight and other light sources (street lamps, vehicle headlights) deteriorates due to interference from artificial light sources
Solution Approach 1:
The invention segments the sunlight spectrum by using two separate detectors: one sensitive to UV radiation (200-400 nm) and another sensitive to visible light (400-700 nm). This segmentation allows independent measurement of UV and visible components, enabling reliable differentiation between sunlight (which contains both) and artificial light sources (which typically lack UV or have minimal UV).
Solution Approach 2:
The invention introduces an intermediary evaluation device that processes signals from both UV and visible detectors. This intermediary system compares the ratio of UV to visible light intensity, serving as a mediator to determine whether the detected light is sunlight or artificial light, thereby resolving the contradiction between detection sensitivity and differentiation reliability.
2Reliability
If UV detectors with high sensitivity are used to detect only UV portion of sunlight, then the differentiation between sunlight and artificial light is improved, but the detection sensitivity to UV radiation requires complex filtering and cooling systems
Solution Approach 1:
The invention changes the material parameter of the UV detector by using silicon carbide (SiC) with a wide bandgap of 3.2 eV. This material parameter change enables the detector to be sensitive to UV radiation while inherently rejecting visible light without requiring complex optical filtering systems. The wide bandgap also allows operation at room temperature, eliminating the need for cooling systems.
3Measurement precision
If SiC semiconductor detectors with low dopant concentration are used to detect UV radiation, then the sensitivity to UV portion of sunlight is improved, but the detector becomes more susceptible to interference from other UV sources
Solution Approach 1:
The invention maintains continuous monitoring of both UV and visible light components simultaneously. By continuously evaluating the ratio between UV and visible intensities, the system can distinguish between sunlight (consistent UV/visible ratio) and artificial UV sources (abnormal UV/visible ratio), thereby improving UV detection sensitivity while reducing susceptibility to false interference.
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 method provides reliable and precise detection of sunlight intensity, even in the presence of artificial light sources, with high sensitivity and stability, enabling accurate control in applications and allowing operation at room temperature without cooling, and enabling differentiation between direct sunlight and artificial light sources.
Implementation Method 1
a detector arrangement which is only sensitive to a UV portion of incident sunlight and supplies an output signal. The sunlight is then detected using the output signal from the detector array
Data Source
Figure 1~3
Figure 4
AI summary
The present invention relates to a method for detecting sunlight (2) with a detector arrangement that provides an output signal depending on the incident sunlight. The method employs a detector arrangement with a SiC semiconductor detector (1) that is sensitive only to the UV component of the incident sunlight (2). By using such a detector arrangement, interference with sunlight detection by artificial light sources is largely avoided, thus enabling more reliable detection of sunlight (2).