Gasera’s PA201 custom gas measurement system is a gas cell with an integrated detector that can be combined with different types of laser sources, making it an extremely versatile research tool. It also includes the gas exchange module that makes it extremely easy to use.
This is a unique research tool that will immediately create data for novel research publications. Our customers have published many artcles with the help of PA201. For example, Tomberg et al have achieved detection limit at parts-per-quadrillion level for HF in this Nature publication.
PA201 is designed for laboratory measurements and it can be easily tailored for different types of light sources such as the near infrared distributed feedback laser (DFB), quantum cascade laser (QCL) and optical parametric oscillator (OPO).
Laser photoacoustic spectroscopy (LPAS) is highly attractive method for trace gas analysis due to the high sensitivity, linearity and low sample gas volume. Tunable laser sources provide high selectivity and high measurement accuracy due to the zero background nature of the measurement principle.
If you have new gas analysis application in mind that requires ultra high performance, Gasera’s PA201 is the right tool to start from!
Applications
- Trace-level gas detection
- Headspace gas measurements
- Laser research
- Reference gas cell
Measurable gases include
- CFCs and PFCs: CF4, C2F6, R13 , R-134a etc.
- Corrosives (at low levels): HCl, HCN, HF
- Hydrocarbons: CH4, C2H2, C2H4, C2H6 etc.
- Inorganics: CO, CO2, H2O, H2S, NO, NO2, N2O, NF3, NH3, SF6, SO2
- VOCs: acetone, benzene, ethanol, formaldehyde, methanol, toluene, xylenes etc.
Specifications
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- Gas cell, stabilized to 50 Celsius temperature
- Measurement pressure: between 300 mbar – 1000 mbar.
- Patented ultra-sensitive optical microphone based on a MEMS cantilever sensor coupled with a laser interferometer to measure microscopic movement of the cantilever sensor
- Specialised cell design for vibrational noise attenuation
- Low gas volume (total gas volume of the system is approx. 30 ml)
- Real-time DSP (digital signal processing) unit for providing an analog and digital output signal proportional to the cantilever movement. Analog signal is connected with BNC output connectors and digital signal uses USB.
- Measurement software for data aquisition via USB
- Three gas connections. The sample gas has two connections, one for input and one for output. The input is equipped with a particle filter.
- Nitrogen purge for measurement compartment
- The gas exchange procedure is user configurable by a simple user interface with display and buttons. The gas exchange can be started manually with a press of a button or the controller can be programmed to do it automatically using timer or an external trigger.
- Documentation on the measurement principle and the DSP module
- Documented instructions on how to use the PA gas cell and the DSP unit
- Detection limit: Gas and light source dependent. Typically in the ppb -region with NIR diode lasers and ppt-region with MIR quantum cascade lasers.
- Optical path length: 100 mm at optical axis
- Repeatability: < 1 % of measured value in operational conditions at the calibration concentration (light source dependent)
Downloads
Related pages
Related readings
- Tomberg, T. et al: Sub-parts-per-trillion level sensitivity in trace gas detection by cantilever-enhanced photoacoustic spectroscopy, Scientific Reports (2018) 8:1848
- Peltola, J. et al: Parts-per-trillion-level detection of nitrogen dioxide by cantilever-enhanced photo-acoustic spectroscopy, Optics Letters (2015) Vol. 40, No. 13
- Peltola, J. et al: High sensitivity trace gas detection by cantilever-enhanced photoacoustic spectroscopy using a mid-infrared continuous-wave optical parametric oscillator, Optics Express (2013) Vol. 21, No. 8
- Hirschmann, C. et al: Sub-ppb detection of formaldehyde with cantilever enhanced photoacoustic spectroscopy using quantum cascade laser source, Applied Physics B (2013) volume 111, pages 603–610
- M. Parkes, K. A. Keen, and E. D. McNaghten, “Trace gas detection using a novel cantilever-based photoacoustic spectrometer with multiplexed optical fiber-coupled diode lasers and fiber-amplification” Proceedings of SPIE — Volume 6770 Fiber Optic Sensors and Applications V, Eric Udd, Editor, 67701C (Oct. 12, 2007)
- R. E. Lindley, A. M. Parkes, K. A. Keen, E. D. McNaghten, A. J. Orr-Ewing, “A sensitivity comparison of three photoacoustic cells containing a single microphone, a differential dual microphone or a cantilever pressure sensor” Appl. Phys. B 86, 707 – 713, (2007).
- V. Koskinen, J. Fonsen, K. Roth, J. Kauppinen, “Cantilever enhanced photoacoustic detection of carbon dioxide using a tunable diode laser source”, Appl. Phys. B 86, 451 – 454 (2007), Rapid Communications.
- H. Cattaneo, T. Laurila, R. Hernberg, “Photoacoustic detection of oxygen using cantilever enhanced technique”, Appl. Phys. B 85, 337 – 341 (2006).
- T. Laurila, H. Cattaneo, T. Pöyhönen, V. Koskinen, J. Kauppinen, R. Hernberg, “Cantilever-based photoacoustic detection of carbon dioxide using a fiber-amplified diode laser”, Appl. Phys. B 83, 285-288 (2006), Erratum: Appl. Phys. B 83, 669 (2006).
