Compressed-Sensing Spectrum Measurement Across UV, Visible, and IR
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Solution Overview
Problem
Existing hyperspectral technologies face limitations in extending spectrum measurement to wider bands such as infrared and ultraviolet without increasing costs or size, particularly in consumer electronic devices like smartphones, due to the high cost and size of specialized cameras for these bands.
Innovation Solution
A spectrum measurement apparatus utilizing spectrally coded modulated light sources and a compressed sensing algorithm to emit non-correlated light spectrums in a time-division manner, combined with single-point photodetectors and two-dimensional imaging detectors, to measure reflectivity spectra across infrared, ultraviolet, and visible light bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If specialized cameras for infrared and ultraviolet bands are used to extend spectrum measurement range, then measurement precision and band range are improved, but device complexity and cost increase
Solution Approach 1:
The patent merges multiple light emitter units with different emission spectra into a single integrated illumination system. Multiple light sources (including infrared, visible, and ultraviolet emitters) are combined to illuminate the target simultaneously, eliminating the need for separate specialized cameras for each band. The single-point photodetector then measures the composite reflected light to reconstruct spectra across all bands.
Solution Approach 2:
The single-point photodetector serves as a universal detector capable of measuring reflected light across multiple spectral bands (infrared, visible, and ultraviolet). By using a single multi-functional detector instead of multiple specialized cameras, the system achieves broad spectrum measurement capability while reducing device complexity and cost.
2Adaptability or versatility
If multiple specialized detectors for different bands are used, then spectrum measurement range is improved, but device size and cost increase
Solution Approach 1:
The patent combines multiple light emitter units with different emission spectra into a single integrated illumination system. Multiple light sources (including infrared, visible, and ultraviolet emitters) are combined to illuminate the target simultaneously, eliminating the need for separate specialized cameras for each band. The single-point photodetector then measures the composite reflected light to reconstruct spectra across all bands.
Solution Approach 2:
The single-point photodetector serves as a universal detector capable of measuring reflected light across multiple spectral bands (infrared, visible, and ultraviolet). By using a single multi-functional detector instead of multiple specialized cameras, the system achieves broad spectrum measurement capability while reducing device size.
3Measurement precision
If conventional optical dispersion methods are used for spectrum analysis, then measurement precision is improved, but device complexity and size increase
Solution Approach 1:
The patent replaces conventional mechanical optical dispersion systems (such as gratings or prisms that physically separate light into spectra) with a computational approach. The system uses multiple light emitters with known emission spectra and a single photodetector to measure reflected light intensities. Spectral information is then extracted through mathematical reconstruction algorithms, eliminating the need for complex mechanical dispersion components.
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 efficient and cost-effective spectrum measurement across a wider band range, including infrared and ultraviolet, while maintaining a compact size, suitable for integration into consumer electronics.
Implementation Method 1
a plurality of first light emitter units, where each first light emitter unit is adapted to emit light having a first emission spectrum in a first band range
Implementation Method 2
light intensity of light that is emitted by each first light emitter unit and that is reflected by the to-be-measured object
Implementation Method 3
a first single-point photodetector, adapted to separately detect light intensity of light that is emitted by each first light emitter unit and that is reflected by the to-be-measured object
Data Source
AI summary
An example spectrum measurement apparatus includes: a plurality of first light emitter units, where each first light emitter unit is adapted to emit light having a first emission spectrum in a first band range, first emission spectrums emitted by any two first light emitter units are not correlated, and the plurality of first light emitter units can be operated to emit light having corresponding first emission spectrums to a to-be-measured object in a time-division manner; a first single-point photodetector, adapted to separately detect light intensity of light that is emitted by each first light emitter unit and that is reflected by the to-be-measured object; and a calculation apparatus, adapted to determine a first reflectivity spectrum of the to-be-measured object in the first band range based on the plurality of first emission spectrums and the detected corresponding light intensity.