MEMS Mid-Infrared Spectrometer for Compact Vibrational Analysis
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Solution Overview
Problem
Conventional mid-infrared spectrometers are costly, large, and not suitable for point-of-care, industrial, or consumer applications due to high manufacturing costs and limited accessibility, failing to provide affordable, high-resolution, and sensitive measurements for materials and substances in the 2.5 μm to 14 μm wavelength range.
Innovation Solution
A compact, handheld mid-infrared absorption spectrometer system utilizing a Micro-Electro-Mechanical System (MEMS) single element emitter light source, a scanning high-efficiency infrared spectral grating with self-calibrating features, and a single-element thermal detector, combined with a micro-machined attenuated total reflection (ATR) silicon crystal, offering improved resolution and sensitivity at a significantly lower cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional laboratory FT-IR spectrometers are used, then spectral measurement capability is achieved, but cost and size become prohibitive for portability and accessibility
Solution Approach 1:
The patent segments the spectrometer into compact modular components: a MEMS-based light source, a micro-louver array for spectral filtering, and a small detector array. This segmentation enables the instrument to be miniaturized while maintaining spectral measurement capabilities, resolving the contradiction between measurement precision and device complexity.
Solution Approach 2:
The patent replaces conventional mechanical dispersive optics (gratings, prisms, moving mirrors) with a MEMS-based system using micro-louver arrays and electronic beam steering. This substitution eliminates bulky mechanical components while achieving spectral resolution, directly addressing the size and cost constraints of traditional FT-IR spectrometers.
2Adaptability or versatility
If linear variable spectral filter instruments are used, then spectral range coverage is improved, but manufacturing cost remains high at $10,000 or more
Solution Approach 1:
The patent employs a single MEMS light source and micro-louver array system that can electronically tune across the entire mid-infrared spectral range (2.5-14 μm). This universal design eliminates the need for multiple fixed-filter instruments for different spectral regions, reducing manufacturing cost while maintaining broad spectral adaptability.
Solution Approach 2:
The patent achieves spectral range tuning by electronically controlling the MEMS device parameters (louver angles, beam steering positions) rather than using physical filter changes. This parameter-based control enables cost-effective coverage of 2.5-14 μm wavelength range with a single instrument platform.
3Length of moving object
If conventional spectrometers are miniaturized for portability, then size is reduced, but spectral resolution and sensitivity deteriorate
Solution Approach 1:
The patent replaces traditional mechanical optics with MEMS-based micro-louver arrays that achieve spectral dispersion and beam steering in a compact footprint. This substitution maintains spectral resolution and sensitivity while enabling handheld portability, as the MEMS components operate effectively at micrometer scales without the bulk of conventional optical benches.
Solution Approach 2:
The patent uses periodic scanning of the MEMS-controlled light beam across the detector array to build spectra over time. This periodic beam steering approach enables high spectral resolution with a compact detector array, maintaining measurement precision while minimizing instrument size for portable operation.
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 system achieves 3 times better resolution and 2 times better sensitivity than current linear variable filter instruments, with manufacturing costs under $200 per unit, making it affordable for various applications, including medical and industrial use, while enabling in-line, real-time monitoring and consumer applications like food quality assessment.
Implementation Method 1
an infrared Micro-Electro-Mechanical System (MEMS) single element emitter light source that is electrically pulsed and emits electromagnetic radiation in the wavelength range from 2.5 μm to 14 μm
Implementation Method 2
a scanning high-efficiency infrared spectral grating with self-calibrating feature, configured so that incident energy having absorption information
Implementation Method 3
a single-element thermal detector to receive output energy having the absorption information from the infrared spectral grating
Implementation Method 4
Absorption spectroscopy refers to spectroscopic techniques that measure the absorption of radiation, as a function of frequency or wavelength, due to its interaction with a sample
Data Source
AI summary
Systems and methods for measuring a fundamental mode vibrational spectrum of materials and substances in the Mid-IR spectral range of 2.5 μm to 14 μm wavelength. are disclosed herein. In one embodiment, a Mid-infrared absorption spectrometer (MIRAS) system includes an infrared Micro-Electro-Mechanical System (MEMS) single element emitter light source. The light source is electrically pulsed and emits electromagnetic radiation in the wavelength range from 2.5 μm to 14 μm and has an integral energy concentrating optic to provide energy for a spectral absorption process. The system includes a scanning high-efficiency infrared spectral grating with self-calibrating feature, configured so that incident energy having absorption information for the spectral absorption process of a sample is within a predefined threshold of a grating blaze angle. The system also includes a single-element thermal detector to receive output energy having the absorption information from the infrared spectral grating.