LED-Based Spectrometer for High-Resolution Spectrum Detection
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Summary
Problems
Conventional spectrometers using LED arrays as light sources suffer from lower wavelength resolution and signal-to-noise ratio compared to halogen tungsten lamp spectrometers, and the arrangement of LEDs limits the measurement accuracy due to the requirement for a parallel surface of the object under test, which is often difficult to maintain, especially for curved or non-uniform surfaces.
Innovation solutions
A rotary-typed light emitting apparatus comprising multiple LEDs with different wavelength ranges and current densities, where the LEDs emit light discontinuously with varying frequencies, allowing for improved wavelength resolution and signal-to-noise ratio by overlapping or non-overlapping wavelength ranges and using a rotating mechanism to accommodate non-parallel surfaces.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If tungsten filament lamp is used as light source, then continuous spectrum can be obtained, but high temperature causes qualitative changes in organic samples
Why choose this principle:
The patent divides the continuous spectrum requirement into multiple discrete LED light sources, each emitting in a specific wavelength range. This segmentation allows obtaining spectrum coverage without using a single high-temperature tungsten filament, thus avoiding thermal damage to organic samples while maintaining continuous spectral coverage through combination of multiple LED emissions.
Principle concept:
If LED array is used to replace tungsten lamp, then temperature-related sample damage is reduced, but wavelength resolution decreases
Why choose this principle:
The patent assigns different wavelength ranges to different LED positions in the array, with each LED having optimized emission characteristics for its specific spectral region. This local quality differentiation allows precise wavelength selection and resolution while maintaining low operating temperatures, as each LED operates in its optimal efficiency range rather than requiring a broad-spectrum high-temperature source.
Application Domain
Data Source
AI summary:
A rotary-typed light emitting apparatus comprising multiple LEDs with different wavelength ranges and current densities, where the LEDs emit light discontinuously with varying frequencies, allowing for improved wavelength resolution and signal-to-noise ratio by overlapping or non-overlapping wavelength ranges and using a rotating mechanism to accommodate non-parallel surfaces.
Abstract
A light emitting apparatus has light emitting units. The light emitting units can be respectively provided with current densities, so that the light emitted by each of the light emitting unit has a light intensity, wherein the current densities are different from each other, or partial of the current densities are different from each other. A number of the light emitting units can be larger than or equal to four, all of the four lighting frequencies of the four light emitting units are different from each other, or partial of the four lighting frequencies of the four light emitting units are identical to each other, and the light emitting apparatus and the object under test rotate relative to each other. A light emitting method, a spectrum detection method and a lighting correction method are also illustrated for increasing SNR, correcting the light intensity or the spectrum signal.