Transcript Presentasjon

Microelectronics in gas sensing
and glimpses
of other electro optic activities
Jon Kristian Hagene
Norsk Elektro Optikk AS (NEO)
Norway
Transatlantic Science Week 2011
Norsk Elektro Optikk AS, NEO
• NEO is a SME located in Norway
• Founded in 1985, working within the
field of electro-optics
• Main fields of work is tuneable diode
laser spectroscopy, pipeline
inspection/digital imaging/underwater
optics and hyperspectral imaging
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NEO History
• Offspring from the Norwegian Defence
Research Establishment (1985)
• Early idea to do research for the offshore
oil and gas industry, underwater optics, but
oil price dropped 50% in 1985/86
• Space projects for the European Space
Agency, ESA. From start to mid nineties,
new space activity in recent years.
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NEO History
• First gas monitor prototype in 1990
• Laser based (TDLAS) in sales from
1995
• Underwater optics/pipeline inspection
back in the mid nineties as well as
recent years
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Current projects, micro/nano
• LaserGas III, 3rd generation TDLAS.
Funding: own + “Skattefunn”
• Optical Microphone, photoacoustic
spectroscopy, SINTEF main actor, NEO
industrial partner for gas sensing,
Funding of SINTEF: NRC, NEO: own
• CLARITY, System on a chip, NEO
industrial partner in European project.
Funding: EU, FP7. (3 years)
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LASERGAS III
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LaserGas III
• Gas monitoring very important for NEO
• 3rd generation TDLAS gas monitor
• move from 2nd harmonic detection
(partly analogue processing) to more
digital processing
• miniaturised electronics
• more approvals, Ex-d, SIL2 etc.
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LaserGas III stack & portable
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Transmitter part
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Receiver part
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Applications / development
• Currently many industrial applications,
process control, emissions monitoring,
safety systems etc.
• Adding new applications in food industry
and medical based on LG3 platform
• Near future:
Mid IR
move from Near IR to
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OPTICAL MICROPHONE
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Objective with new development
• Stronger gas absorption lines in Mid IR
give better sensitivity, detect new gases
• However, detectors might be a problem:
noisy and/or expensive
• Developing other detection techniques...
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“Optical microphone“
• Co-operation with SINTEF, Norway (patent)
• SINTEF funded by the Research
Counsil of Norway
• Intermediate step using a quartz tuning
fork to measure gas (QEPAS)
• Final version will be using a micro
machined “microphone” to boost gas
detection sensitivity
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What is a Quartz tuning fork?
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Photo Acoustic Spectroscopy
Key elements of QEPAS
• Laser modulated at 16 kHz (sine on top
of ramp)
• QTF mounted in small gas cell with
micro resonator that gives up to 10X
amplification
• QTF resonance frequency 32 kHz
• We are using existing electronics design
(LGII, 2nd harmonic detection)
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QEPAS set-up
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QEPAS set-up mechanics
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Early QEPAS results
• Got a very robust micro resonator
design compared to others, industrial
use possible
• First version has a detection limit of 10
ppm for CH4 (methane), (best published
results 2 ppm)
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4. Photo-acoustics
•
•
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Photoacoustic spectroscopy was invented
by Alexander Graham Bell, ~1880
Key item: a sensitive microphone
The world’s most sensitive microphone is
currently being developed by SINTEF
Detection of <1ppb concentration of
gasses possible (comparable to GC-MS)
Patented SINTEF
optical microphone
Gas
Microphone
Sound
Infrared ight
Technology for a better society
Optical microphone summary
• Use other lasers than we use today,
from NIR to Mid IR, Quantuum cascade
lasers (QCL)
• Improved sensitivity and new gases
• Optical detection instead of current
noisy (and/or expensive) detectors
• Enable new gas monitoring applications
pushing technology forward
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“CLARITY”
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• CLARITY, European Project, FP7
• Recently started, duration 3 years
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Clarity project
• Spectroscopy in Mid IR and detection in Near
IR (8 um spectroscopy, 1.5-2 um detectors
(InGaAs))
• Improved S/N ratio, better detection limits
• Ultimate goal: a system on a chip
•
Compact uLtrA-efficient mid-infRared photonIc sysTems based on low noise quantum
cascade laser sources, wide band frequencY converters and near-infrared photodetectors
•
http://www.clarity-project.eu/
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OTHER EO ACTIVITIES
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OPTOPIG
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Optopig HW and results
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TILEFISH
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TileFish a AUV LED Camera
(Left figure FFI)
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TileFish results
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WATSEN
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WatSen specification
• Project for European Space Agency,
ESA, «breadboard»
• Open University, UK, main contractor,
NEO main contractor for microscope
part
• ATR spectrometer 5.5um-10.8 um
• Microscope 1280x1024 pixels
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WatSen Water Sensor for Mars
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THE END
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