Spectroscopy Apparatus Using Filter Array for High Resolution
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Solution Overview
Problem
Existing spectroscopy technologies face challenges in achieving high spectral resolution while maintaining a small device size, which is essential for non-invasive bio-signal measurement in wearable and mobile healthcare applications.
Innovation Solution
The proposed solution involves a spectroscopy apparatus and method that utilize a dispersive element, such as a diffraction grating or prism, in conjunction with a filter array to divide incident light into multiple beams with different output angles, providing a higher spectral resolution than the dispersive element alone, and integrating the filter array into the detector to maintain a small size while achieving high resolution measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a dispersive element alone is used to divide incident light, then the device size remains small, but the spectral resolution is insufficient
Solution Approach 1:
The patent divides the light division function into two stages: a dispersive element performs primary division into multiple light beams, and a filter array performs secondary division with higher spectral resolution. This segmentation allows each component to focus on a specific aspect of light division, achieving high spectral resolution while maintaining compact device size.
Solution Approach 2:
The patent combines a dispersive element and a filter array into a single integrated spectroscopy apparatus. The dispersive element and filter array work together synergistically, where the dispersive element provides initial light separation and the filter array refines the spectral resolution, achieving both high resolution and compact integration.
2Measurement precision
If a filter array is added to increase spectral resolution, then spectral resolution improves, but device size increases
Solution Approach 1:
The patent transitions from a single-stage light division approach to a two-stage approach by introducing the filter array in a different dimensional space. The dispersive element operates in the angular domain while the filter array operates in the spectral domain, allowing high spectral resolution without proportionally increasing device volume.
Solution Approach 2:
The filter array is integrated into the detector structure, nesting the filtering function within the detection function. This nested arrangement allows the filter array to be incorporated without significantly increasing the overall device volume, as the filtering elements are positioned within or adjacent to the detector pixels.
3Measurement precision
If light is divided into multiple beams with different output angles, then spectral resolution increases, but light loss increases
Solution Approach 1:
The patent converts the potential harm of light loss into a benefit by using the filter array to selectively transmit only the desired spectral components. The filter array acts as a beneficial filter that prevents unwanted light from reaching the detector, effectively converting what would be loss into selective transmission, thereby improving signal-to-noise ratio.
Solution Approach 2:
The patent changes the spectral parameters of the light beams by introducing the filter array, which modifies the wavelength composition of each beam. By adjusting the filter characteristics, the system optimizes which wavelengths are transmitted and which are blocked, reducing light loss for the desired measurement while maintaining high spectral resolution.
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
This approach allows for increased spectral resolution and reduced light loss, enabling accurate bio-signal measurement in a compact form factor suitable for wearable and mobile healthcare devices.
Implementation Method 1
a dispersive element configured to divide an incident light into a plurality of lights having different output angles
Implementation Method 2
a dispersive element configured to divide an incident light into a plurality of lights having different output angles
Implementation Method 3
a filter array configured to divide the plurality of lights, with a higher spectral resolution than a spectral resolution of the dispersive element
Implementation Method 4
a collimating lens configured to collimate and transfer the incident light to the dispersive element
Implementation Method 5
a parabolic concentrator configured to collimate the incident light to the reflective diffraction grating
Implementation Method 6
a focal lens configured to focus the plurality of lights output from the dispersive element
Data Source
AI summary
A spectroscopy apparatus, a spectroscopy method, and a bio-signal measuring apparatus are provided. The spectroscopy apparatus may include: a dispersive element configured to divide an incident light into a plurality of lights having different output angles; and a filter array configured to divide the plurality of lights, with a higher spectral resolution than a spectral resolution of the dispersive element, and provide the divided plurality of lights to a detector.