Rotary LED Light Source Layout for High-Resolution Spectrum Detection
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Solution Overview
Problem
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 sample surface, which is often difficult to maintain, especially for curved or non-uniform samples.
Innovation Solution
A rotary light emitting apparatus comprising multiple LEDs with distinct wavelength ranges and lighting frequencies, where the wavelength ranges of adjacent LEDs are partially overlapped or non-overlapped, and each LED has different current densities to improve light intensity and wavelength resolution, allowing for continuous or discontinuous light emission to enhance signal-to-noise ratio and accommodate non-parallel sample surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If LED arrays are used as light sources to replace halogen tungsten lamps, then the heating problem is solved and energy consumption is reduced, but the wavelength resolution and signal-to-noise ratio deteriorate
Solution Approach 1:
The patent divides the light source into multiple independent LED modules, each emitting at different wavelengths. This segmentation allows precise control over the spectral composition and intensity of light, enabling high wavelength resolution while maintaining low temperature operation. Each LED module can be independently optimized for specific wavelength ranges.
Solution Approach 2:
The patent employs multiple LEDs with different forward voltage parameters and spectral characteristics. By selecting LEDs with specific parameters (wavelength, intensity, forward voltage) and controlling their drive currents, the system achieves high wavelength resolution and signal-to-noise ratio while maintaining low operating temperature, resolving the contradiction between temperature reduction and measurement precision.
2Use of energy by moving object
If LED arrays are used as light sources, then energy consumption is reduced and lifespan is extended, but the signal-to-noise ratio deteriorates
Solution Approach 1:
The patent applies local quality by assigning different drive currents to different LED modules based on their specific spectral characteristics and measurement requirements. LEDs emitting at wavelengths where the sample has strong absorption features are driven at higher currents to enhance signal strength, while others operate at lower currents, optimizing the signal-to-noise ratio across the entire spectral range while maintaining low overall energy consumption.
Solution Approach 2:
The patent implements periodic switching of different LED modules to illuminate the sample sequentially at different wavelengths. This periodic action allows the detector to integrate signals over time for each wavelength, improving the signal-to-noise ratio through temporal averaging while keeping the duty cycle low to maintain low average power consumption.
3Device complexity
If LEDs are arranged in a row or predetermined manner on a plane, then the device complexity is reduced, but the measurement accuracy deteriorates due to the requirement for parallel sample surfaces
Solution Approach 1:
The patent transitions from a two-dimensional planar LED array to a three-dimensional spatial configuration. Multiple LED modules are positioned at different heights and angles relative to the sample surface, creating a volumetric illumination structure. This dimensional change allows the system to illuminate non-parallel and curved surfaces effectively, maintaining measurement accuracy without requiring complex planar arrangements.
Solution Approach 2:
The patent introduces dynamic adjustment capabilities to the LED module positions and orientations. The LED modules can be adjusted to adapt to different sample geometries and surface orientations, enabling accurate measurement of various sample types without requiring complex fixed arrangements. This dynamic adaptability simplifies the overall device design while maintaining high measurement precision.
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 wavelength resolution and signal-to-noise ratio comparable to halogen tungsten lamp spectrometers while enabling accurate measurement of non-parallel and non-uniform samples by improving light intensity correction and rotating the light emitting apparatus relative to the sample.
Implementation Method 1
The light emitting apparatus at least comprises a plurality of light emitting units. 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.