Compact Spectrometer with 3D-Folded Light Path
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Solution Overview
Problem
Conventional optical spectrometers face challenges in achieving compact size and high spectral resolution while maintaining efficient light collection and accurate real-time calibration, particularly in handheld devices for applications like food safety and material identification.
Innovation Solution
The spectrometer device incorporates a 3D-folded geometric light path with a movable dispersive element and dual light sensors, utilizing a single excitation light source emitting multiple wavelength bands to simultaneously illuminate a sample, and includes a calibration mechanism using a neon light bulb or multi-wavelength laser for real-time wavelength calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional optical spectrometers use traditional optical paths, then spectral resolution can be maintained, but device size becomes large and portability is reduced
Solution Approach 1:
The patent implements a 3D-folded geometric light path that changes direction at least four times between the sample and detector, utilizing three-dimensional spatial folding to compress the optical path. This allows the optical components to be arranged in a compact configuration while maintaining the required optical path length for high spectral resolution, effectively resolving the contradiction between device size and measurement precision.
2Device complexity
If a single excitation light source with multiple wavelength bands is used, then device complexity is reduced, but calibration accuracy may be compromised
Solution Approach 1:
The patent employs a single excitation light source capable of emitting multiple distinct wavelength bands that can simultaneously illuminate the sample. This multi-functional light source reduces device complexity by eliminating the need for multiple separate light sources while maintaining calibration accuracy through the use of multiple wavelength bands for comprehensive spectral coverage and real-time calibration capabilities.
3Measurement precision
If the dispersive element is made movable for scanning, then spectral resolution is improved, but device complexity and potential mechanical failure increase
Solution Approach 1:
The patent incorporates a movable dispersive element with at least one moveable component that scans the plurality of different wavelength bands of the output light across the detector. This dynamic configuration allows the system to achieve high spectral resolution by scanning different wavelengths across the detector, while the controlled movement enables precise spectral measurement through temporal separation of wavelength information.
4Measurement precision
If real-time calibration is implemented, then measurement accuracy is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent enables real-time calibration by incorporating a calibration mechanism that can perform wavelength calibration during normal operation. The system uses the multiple wavelength bands from the single excitation light source to continuously monitor and correct spectral measurements, maintaining high calibration accuracy without requiring separate calibration procedures or additional power-intensive 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
This configuration enables a compact, high-resolution spectrometer capable of real-time calibration, enhancing sensitivity and accuracy for Raman and fluorescence analysis, suitable for field applications with reduced size and increased portability.
Implementation Method 1
The dispersive element spatially separates output light emanating from the sample in response to the excitation light into a plurality of different wavelength bands
Implementation Method 2
The detector includes at least one light sensor that senses the wavelength bands of the output light and generates an output electrical signal in response to the sensed output light
Implementation Method 3
In addition to the Raman spectrum, the fluorescence spectrum from a sample can also be a sensitive indicator of the presence of certain chemicals
Data Source
AI summary
A compact spectrometer includes an excitation light source configured to generate excitation light and arranged to illuminate a spot on a sample. A dispersive element includes at least one movable component and spatially separates output light emanating from the sample in response to the excitation light into a plurality of different wavelength bands. A moveable component of the dispersive element causes the plurality of different wavelength bands of the output light to be scanned across a detector. The detector includes at least one light sensor that senses the wavelength bands of the output light and generates an output electrical signal in response to the sensed output light.