Measurement of Formaldehyde Pollution in Ambient Air
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Transcript of Measurement of Formaldehyde Pollution in Ambient Air
MEASUREMENT OF FORMALDEHYDE POLLUTION IN AMBIENT AIR
Dr. Ismo Kauppinen, CEO 24. May 2017
AQE 2017
FORMALDEHYDE can cause acute health problems and possibly even cancer
• Formaldehyde is a colorless gas with a pungent odor • levels above 0.1 ppm can cause acute health problems, e.g. sore throat, skin
irritation, nausea, scratchy eyes and cough • It is also classified as highly carcinogenic compound. Exposure to moderate
amounts of formaldehyde has been linked to cancer, such as leukemia
• Children may become sensitive to formaldehyde more easily than adults
• However, the full effect of exposure to small amounts and all of the effects are still unknown
SERIOUS HEALTH EFFECTS
WE ARE EXPOSED TO FORMALDEHYDE EVERYDAY
• Industrial emissions, traffic, building materials, cooking, and tobacco smoking are sources of formaldehyde
• Also many everyday products, such as cosmetics, furniture, and
detergents contain formaldehyde
• High levels of formaldehyde are often found in new homes or homes with new construction
• Formaldehyde is a significant emission from biofuel usage, which is increasing. It is expected that biofuel combustion will have a significant effect on increasing formaldehyde levels, especially in urban areas
TECHNOLOGY & INVENTIONS
PHOTOACOUSTIC SPECTROSCOPY • Photoacoustic effect was discovered in 1880 by
Alexander Graham Bell
• This theoretical potential has not been reached, since conventional microphones have been used for sensing the pressure pulses
• Gasera’s novel cantilever sensor technology allows the use of the full potential of the photoacoustic phenomena
Photoacoustic spectroscopy is based on the absorption of light leading to the local warming of the absorbing volume element. The subsequent expansion of the volume element generates a pressure wave proportional to the absorbed energy, which can be detected via a pressure detector.
PHOTOACOUSTIC GAS CELL IR SOURCE
MICROPHONE
IR FILTER
CHOPPER
A typical setup of a conventional PAS system
GAS SAMPLE
GASERA’S KEY INVENTIONS • Cantilever sensor
• Over 100 times greater physical movement can be achieved compared to conventional microphone membrane
• Highly linear response
• Optical readout system • Contactless optical measurement based on laser interferometry • Measures cantilever displacements smaller than picometer (10-12 m) • Extremely wide dynamic measurement range
BENEFITS OF CANTILEVER ENHANCED PAS
stability,reliability,easytouse Absorp(onismeasureddirectlyinPAS,whichmakesthemeasurementveryaccurateandfreeofdri<
belowppbdetec2onlimits Can(leversensorprovideshighsensi(vity
widelineardynamicrange,miniaturiza2on,lowsamplevolume Sensi(vityisnotdependentontheop(calpathlength
mul2-gascapability Manydifferentsourcescanbeconnectedtoonecell
suitabletowiderangeofprocessapplica2ons Possibilitytoheatthesamplecell
GASERA ONE Multi-gas analyzer to protect life, health and security
CONCEPT
• Sensitivity – Patented cantilever sensor
• Reliability – Photoacoustic principle • Versatility – can be combined with
different types of light sources (NIR-TDL, DFB-QCL, EC-QCL, OPO, Broadband IR and filters)
GASERA ONE - APPLICATIONS LIFE
Climate change prevention • Greenhouse gas
monitoring for animal husbandry
• GHGs from soil emissions
HEALTH Air quality for living and occupational safety • Detection of
hazardous chemicals at industrial sites and in cargo containers
• Monitoring air pollution
SECURITY Border security, prevention of smuggling and human trafficking • Narcotics • Explosives • Hidden persons
FORMALDEHYDE MONITORING
“Until today, ambient formaldehyde has been difficult to continuously and automatically monitor with existing technologies.”
FORMALDEHYDE MEASUREMENT CONCEPT
Photoacous(cGasCell
ReadoutInterferometer
Can(leverSensor
DFB-QCLSource
NOISE
LINEARITY
FIELD TESTING
GASERA ONE FORMALDEHYDE
• Below 1 ppb detection limit (100 mW QCL source) • Standalone system with built-in gas exchange unit • Requires no consumables or wet chemistry • Portability that enables the field use • Short optical path that provides industry- leading dynamic range with single-point calibration • Drift free operation due to direct absorption measurement • Highly selective against aldehydes and other VOCs
CONTACT AND FOLLOW • Lemminkäisenkatu 59
20520 Turku Finland
• [email protected] • [email protected] • www.gasera.fi
• www.facebook.com/gaseraltd
• www.youtube.com/gaseraltd
• https://www.linkedin.com/company/gasera-ltd-
• @gaserafinland
• slideshare.net/gasera