Radiation Detector Using Compound Semiconductors to Remove External Filters
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Solution Overview
Problem
Existing radiation detectors require external filters to prevent infrared radiation from interfering with visible radiation detection, increasing costs and space requirements, and struggle to achieve precise spectral sensitivity distributions.
Innovation Solution
A radiation detector using III-V compound semiconductor materials from the InyAlxGa1-x-yP material system, with a control device that adjusts the contributions of different channel signals to achieve a predefined spectral sensitivity distribution, eliminating the need for external filters and allowing for operation as an ambient light or color sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If silicon is used for detection, then infrared sensitivity is improved, but visible radiation detection requires expensive external filters
Solution Approach 1:
The patent changes the material parameter from silicon to III-V compound semiconductor materials, which fundamentally alters the spectral sensitivity characteristics. This material substitution enables high visible radiation sensitivity while inherently reducing infrared sensitivity, eliminating the need for external infrared filters and reducing production costs.
Solution Approach 2:
The patent employs III-V compound semiconductor materials (such as InGaAlP) which combine multiple elements to achieve desired spectral properties. These composite materials provide tailored bandgap energies that enable selective detection in the visible range while naturally rejecting infrared radiation, replacing the need for silicon-based detectors with external filtering.
2Measurement precision
If external filters are used to block infrared radiation, then visible radiation detection accuracy is improved, but space requirements and production costs increase
Solution Approach 1:
By changing the detector material from silicon to III-V compound semiconductors, the patent achieves intrinsic spectral selectivity through material properties rather than external filters. The bandgap engineering of these materials provides natural cutoff wavelengths that block infrared radiation while maintaining visible radiation sensitivity, eliminating the need for additional filter components and reducing overall detector assembly size.
3Measurement precision
If external filters are used to block infrared radiation, then visible radiation detection accuracy is improved, but production costs increase
Solution Approach 1:
The patent achieves spectral selectivity through material composition parameters rather than additional optical components. By adjusting the bandgap energy of III-V compound semiconductor materials through compositional control, the detector inherently achieves the desired spectral response without requiring expensive external filters, thereby reducing production costs while maintaining detection accuracy.
4Ease of manufacture
If a fixed detector design is used, then manufacturing is simplified, but adaptability to different spectral requirements is reduced
Solution Approach 1:
The patent introduces dynamic controllability through a control device that can adjust the contributions of different channel signals. This allows the spectral sensitivity distribution to be dynamically adapted to different application requirements while maintaining a relatively simple detector structure. The control device enables post-manufacturing flexibility without requiring complex multi-configuration detector designs.
Solution Approach 2:
The detector design incorporates multiple detector elements with different spectral sensitivity channels that can be selectively activated or weighted through the control device. This universal design allows a single detector structure to serve multiple spectral detection needs, achieving versatility while maintaining manufacturing simplicity through standardized detector element fabrication.
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 enables efficient detection of visible radiation without external filters, reduces production costs and space requirements, and allows for customizable spectral sensitivity distributions, including simulating human eye sensitivity and detecting specific spectral lines.
Implementation Method 1
detector elements each have a spectral sensitivity distribution and are suited for signal generation, with at least one detector element comprising a compound semiconductor material designed for detecting radiation in the visible spectral region
Implementation Method 2
the compound semiconductor material can be simply selected such that it is comparatively insensitive in the infrared spectral region, allowing long wave cut-off wavelength in the visible spectral region to be specified via the band gap alone
Data Source
AI summary
A radiation detector is disclosed with a detector arrangement, which has a plurality of detector elements, by means of which a detector signal is obtained during operation of the radiation detector, and with a control device, wherein the detector elements each have a spectral sensitivity distribution, and are suited for generating signals, at least one detector element comprises a compound semiconductor material, and this detector element is designed for detecting radiation in the visible spectral region, the radiation detector is designed such that the sensitivity distributions of the detector elements are used to form different spectral sensitivity channels of the radiation detector, a channel signal assigned to the respective sensitivity channel can be generated in these sensitivity channels using the detector elements, and the control device is designed such that the contributions of different channel signals to the detector signal of the radiation detector are differently controlled.