SiC Photodiode UV-Index Detection with Calibration
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Solution Overview
Problem
Existing UV-index detection devices are not suitable for integration in portable or wearable electronic apparatuses due to high costs, complex production, and incompatible dimensions, which hinder their ability to provide precise UV radiation measurements.
Innovation Solution
A UV-index detection device utilizing a silicon carbide photodiode and a calibration system that applies a correlation factor to the detected current to estimate UV-index levels, eliminating the need for costly filtering elements and allowing for compact integration in portable devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional UV-index detection devices are used, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts only the essential UV detection function by using a simple photodetector without complex optical filters or spectral analysis components. The solution removes unnecessary filtering elements and complex optical paths while maintaining adequate measurement precision through direct photodetector response to UV radiation.
Solution Approach 2:
The patent employs inexpensive photodetector components that can be mass-produced at low cost, replacing expensive laboratory-grade spectrometers and filtered detection systems. The simple detector design enables integration into portable devices where cost and size are critical constraints.
2Measurement precision
If conventional UV detection devices are used, then measurement precision is improved, but device dimensions increase
Solution Approach 1:
The patent removes bulky optical filtering components and complex spectral analysis subsystems from the detection device. By extracting only the core photodetection function, the device volume is dramatically reduced while maintaining sufficient measurement precision for portable application requirements.
Solution Approach 2:
The patent combines the photodetector, signal processing circuitry, and UV-index calculation algorithms into a single integrated compact unit. This merging of functions eliminates the need for separate optical benches, filter assemblies, and processing equipment that would increase device volume.
3Measurement precision
If conventional UV detection devices are used, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent uses low-cost photodetector components and simple circuitry that can be manufactured using standard semiconductor fabrication processes. This approach replaces expensive custom-optics and precision mechanical assemblies with mass-producible integrated circuits and discrete components.
Solution Approach 2:
The patent replaces mechanical optical filtering systems with electronic signal processing and digital algorithms. Instead of using physical filters, lenses, and spectral dispersing elements, the solution uses electronic gain control and software-based UV-index calculation from raw photodetector signals.
4Device complexity
If simple photodetector is used, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent implements calibration procedures and signal processing algorithms that compensate for variations in photodetector response. By using reference measurements and applying correction factors through feedback mechanisms, the system achieves accurate UV-index measurements despite the simplicity of the photodetector component.
Solution Approach 2:
The patent adjusts detection parameters such as integration time, gain settings, and spectral response weighting to optimize measurement precision for the specific photodetector used. By changing these parameters rather than using complex optical filtering, the system maintains accuracy while keeping the device simple.
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 provides an accurate, low-cost, and energy-efficient method for UV-index detection in portable devices, ensuring compatibility and precision without the need for complex optical elements, enabling integration in modern portable and wearable electronic apparatuses.
Implementation Method 1
a photodetector stage (2), in particular including a photodiode of the silicon carbide (SiC) type, which supplies at output a detection quantity, in particular a current Ipuvd, as a function of the radiation detected
Data Source
AI summary
An integrated device for detection of the UV-index is provided with: a photodetector, which generates a detection quantity as a function of a detected UV radiation; and a processing stage, which is coupled to the photodetector and supplies at output a detected value of the UV-index, on the basis of the detection quantity. The processing stage processes the detection quantity on the basis of an adjustment factor, to supply at output the detected value of the UV-index and is further provided with an adjustment stage, coupled to the processing stage for adjusting the value of the adjustment factor.