Rotary LED Spectral Emitter for High-SNR Spectrum Detection
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Solution Overview
Problem
Conventional spectrometers using tungsten filament lamps face issues such as high temperature causing qualitative changes in organic samples, high manufacturing cost, and high system complexity of the monochromator. Additionally, spectrometers using LED arrays have lower wavelength resolution and cannot improve the signal-to-noise ratio (SNR), and require the object under test to be parallel to the plane of the LEDs, which is often difficult to maintain.
Innovation Solution
A rotary-typed light emitting apparatus comprising multiple LEDs that emit light with different wavelength ranges, allowing for selection of wavelength ranges, emission peak wavelengths, and lighting frequencies. The light emitting units are designed to have partially or non-overlapping wavelength ranges, with adjustable current densities to optimize light intensity and improve SNR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If tungsten filament lamp is used as light source, then continuous spectrum can be obtained, but high temperature causes qualitative changes in organic samples
Solution Approach 1:
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.
2Object-affected harmful factors
If LED array is used to replace tungsten lamp, then temperature-related sample damage is reduced, but wavelength resolution decreases
Solution Approach 1:
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.
3Device complexity
If LED array is used, then manufacturing cost and system complexity are reduced, but signal-to-noise ratio cannot be improved
Solution Approach 1:
The patent employs periodic modulation of LED emission and synchronized detection to improve signal-to-noise ratio. By modulating the LED light output at specific frequencies and using lock-in detection or frequency-domain filtering, the system can distinguish weak spectral signals from background noise, thereby improving reliability without adding complex hardware components.
4Ease of manufacture
If LEDs are arranged in a row or predetermined manner, then manufacturing is simplified, but object surface must be parallel to LED plane which is difficult to maintain
Solution Approach 1:
The patent designs the LED array with multiple emission angles and orientations, allowing the system to accommodate objects at various positions and orientations. The multi-functional LED array can emit light in multiple directions and detect reflections from non-parallel surfaces, thereby maintaining ease of manufacture while eliminating the strict parallel positioning requirement through enhanced operational flexibility.
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 achieves high-resolution analysis comparable to conventional halogen tungsten lamp spectrometers, while improving the signal-to-noise ratio and allowing for accurate measurement of reflection and absorption spectra without requiring the object under test to be parallel to the plane of the LEDs.
Implementation Method 1
Each of the light emitting units emits light with at least a light emission peak wavelength and at least a wavelength range
Implementation Method 2
the light detector receives a light beam emitted by the light emitting apparatus
Data Source
AI summary
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.