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New Miniaturized Spectral Measurement Platforms Covering
the Visible to the Mid-IR
John Coates Coates Consulting
IFPAC-2011, NeSSI-II, January 2011
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Paradigm Shifts in Spectroscopic Measurements: Example…Spectral Sensors
Traditional spectroscopic instrumentation Original implementations tend to be large and expensive
Process analyzers are usually in large boxes Trend to point of measurement or sample…production,
process and environmental Smaller instruments favor in a distributed measurement
scheme Recent trends towards portable and handheld Current trends a good fit with enabling
technologies…such as miniaturization, MEMS, handheld computing and wireless
The “GameChangers”…spectral sensors and detectors…fully integrated devices based on solid state components
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Key Enabling Technologies for Miniaturization and Low Cost
Thin film filter technologies Bandpass filters covering from deep UV (220nm) to the mid-IR
(15µm, 15,000nm) Patterned filters produced by microlithography techniques Linear variable filters – currently from the long UV (350nm) to the
mid-IR (15µm, 15,000nm) MEMS…as applied to spectroscopy
Detector arrays in the mid-IR Lasers and LEDs
Broad range of LEDs from UV (250nm) to NIR (1450nm) and out to the upper mid-IR (around 3µm)
QCL Mid-IR lasers Fiber optics
Materials available covering from far UV to mid-IR Fiber faceplates for optical interfacing and geometry conversion
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New Technologies Simple Photometric Engines & Applications
UV-Visible Light Photometric Sensors Color-based measurements Fluorescence methods
Near-Infrared Photometric Sensors Solvents, oil and petroleum products Reaction monitoring – known targets Liquid products – consumer products Powders and solid substrates
Mid-Infrared Photometric Sensors Mid-IR Photometer…includes handheld diagnostic systems
Multicomponent gas analyzers Multicomponent fluid analyzers
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The MicroPac: The First Commercial LVF Spectral Engine by OCLI/JDSU
The MicroPac: An integrated spectral engine… introduced in 2000/2001
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An Example Miniaturized Visible LVF Spectrometer: The Mutoh MSE Module
MSE – Micro-Spectral Engine A Fully Integrated Spectrometer Module
Miniaturized Light Source Fully Integrated Module (Incandescent or LED-based)
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Embedded Application for Spectral Detector Concept: SW NIR In-Line Sensing
Source MSE
Measurement Chamber
MSE Fully Integrated Microspectrometer Module
Fully Integrated Source Module (Incandescent or LED-based
Spectral range – 600nm to 1050nm
Fluid
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Implementation of an Integrated NIR Spectral Sensor
Integrated System includes light sources
Reflectance mode illustrated
Reflectance Mode (Solids)
Light Sources
Integrated Electronics
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Packaged Sensor with Integrated Illumination
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Integrated NIR Spectral Sensor Adapted for In-Line Liquid Monitoring
Generic NeSSI
NIR NeSSI Sensor
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Spectral Sensor Adapted for Transmission Measurements
Transmission Mode (Gases and Liquids)
Integrated Electronics Flow or disposable Cell
Liquids
Gases and Vapors
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Example Data Spectral Sensor: Common Solvents
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Mid-Infrared Spectral Sensors: Multichannel Analyzer
1 to 16 channels Filter “Mosaics”
Liquids or gases High-speed
acquisition…near realtime (0.1 second measurement cycle) for all channels
Low cost, compact
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Short Path Version Multichannel Analyzer: High Concentration Gases and Liquids
Bench-top, Handheld Or Embedded Applications
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Long Path Multichannel Gas Analyzer: Low Level Measurements
Bench-top, Handheld Or Embedded Applications
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Stand-alone or Embedded Mid-IR LVF-Based ATR Analyzer
First in a new series Designed for
embedded, benchtop and handheld applications
Configurations: ATR Transmission
To be introduced in 2011
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Keeping Spectroscopy Small, Simple…and Low Cost!
Keeping Spectroscopy Small…Palm-sized Analyzers In-line sensors Embedded spectrometers Spectral detectors
Spectroscopy Applications UV-Visible Spectral Detector Near-Infrared Spectral Detector Mid-IR Spectral Detector
Gas and Liquids (fixed wavelengths) Full spectra - MEMS-based technology
Cost effective solutions UV-Vis…target costs…$200 (volume) SW-NIR from $25 (High Volume) LW-NIR ~$1500 (Volume) IR from $1000
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