Technology

Patented cantilever enhanced photoacoustics

Gasera has developed new technologies to overcome drawbacks in common measurement solutions. Gasera has developed outstanding improvements to Fourier transform Infrared (FTIR) and photoacoustic spectroscopy (PAS) principles to meet the demands of the modern measurement market. The goal is to develop portable measurement devices with extremely high sensitivity, good selectivity and fast response time for reliable analysis of gases, liquids, and solid materials in demanding environments.

Gasera’s patented cantilever enhanced photoacoustics is a novel measuring technology that can be used e.g. in detection and analysis of gases, liquids, and solid materials in applications of research, industry, environmental, safety, and security.

Photoacoustic spectroscopy

The photoacoustic effect was discovered by Alexander Graham Bell in 1880 during his research to develop the photophone, a device that communicated via light waves. Practical use of the photoacoustic effect has taken approximately a hundred years to develop to the point of great utility.

Major advantage of the photoacoustic effect is the fact that sensitivity is basically not dependent on the optical path length. This allows high sensitivity from short absorption path length and highly linear concentration response over a wide dynamic measurement range from very low sample volumes. Photoacoustic spectroscopy (PAS) is now a commonly used method for analysis of solid, semi-solid, liquid, and gas samples.

Optical microphone

Superior performance when applied to photoacoustic gas detection Cantilever sensor High sensitivity is achieved by using a patented cantilever pressure sensor that is over hundred times more sensitive compared to … Continue reading Optical microphone

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Gas Phase PAS

Gas Phase Photoacoustic Spectroscopy (PAS) The need for rapid and reliable monitoring of air pollutants and hazardous gases is growing and the photoacoustic spectroscopy provides an efficient technology for this … Continue reading Gas Phase PAS

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Solid Phase PAS

Solid Phase Photoacoustic Spectroscopy (PAS) Photoacoustic spectroscopy is well suited and advantageous method for measurement and analysis of solid and semi-solid samples. It is also suitable for powders, fibers, and … Continue reading Solid Phase PAS

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Platforms

Gasera’s highly sensitive cantilever sensor based photoacoustic technology can be utilized in several different ways. Different measurement platforms form a wide variety of measurement setups that can be applied to different measurement needs.

Laser PAS

Laser Photoacoustic Spectroscopy Laser-based sensing techniques are attracting great interest in various fields of applications. Among various detection schemes, photoacoustic detection offers some unique features over other laser-based techniques such … Continue reading Laser PAS

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Optical Filter PAS

Optical Filter Photoacoustic Spectroscopy Photoacoustic spectroscopy (PAS) is based on the absorption of modulated infrared light leading to the local warming of the absorbing gas volume element. The generated pressure … Continue reading Optical Filter PAS

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Differential PAS

Differential Photoacoustic Spectroscopy The differential photoacoustic method combines the sensitivity of photoacoustic spectroscopy with the long absorption path length used by conventional absorption spectroscopy and allows open-path and flow-through detection … Continue reading Differential PAS

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FTIR-PAS

Photoacoustic Fourier Transform Infrared Spectroscopy (FTIR-PAS) FTIR is a widely used method for obtaining IR spectra of a sample. The sample is exposed to IR radiation modulated by an interferometer … Continue reading FTIR-PAS

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Publications

Scientific publications that are related to Gasera’s technology are listed here. Please choose from the links for peer-reviewed papers, conference papers, or poster presentations.

Poster presentations

J. Fonsen, “Cantilever enhanced photoacoustic spectroscopy using a pulsed broadband source”, Physics Days, Turku Finland, 2008. J. Uotila, “Photoacoustic FTIR measurements with a cantilever microphone”, Physics Days, Turku Finland, 2008. … Continue reading Poster presentations

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Conference presentations

Juho Uotila, “Drug precursor vapor phase sensing by cantilever enhanced photoacoustic spectroscopy and quantum cascade laser”, SPIE Security + Defence 2012 Conference, 24-27 September, Edinburgh, United Kindo, 2012. Jussi Raittila, … Continue reading Conference presentations

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Peer-reviewed full articles

C. B. Hirschmann, J. Lehtinen, J. Uotila, S. Ojala, R. L. Keiski, “Sub-ppb detection of formaldehyde with cantilever enhanced photoacoustic spectroscopy using quantum cascade laser source” Appl. Phys. B, DOI … Continue reading Peer-reviewed full articles

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