Wolfgang Reichl's research while affiliated with E+E Elektronik and other places

Publications (11)

Article
We report on the design, simulation and experimental characterization of a simple germanium bolometer utilizing a Fabry–Perot absorbing structure, which can be used for monitoring, e.g., CO2 where no additional filter is required. CO2 absorbs IR-radiation in a major band centered around a vacuum wavelength of 4.26μm. The selectivity of the whole se...
Article
Non-dispersive infrared (NDIR) gas sensors make use of the specific infrared absorption of particular gas molecules in order to measure their distinctive gas concentration. The main parts of such a NDIR gas sensor are: an IR-emitter, a chamber containing the sample-gas, and an IR-detector with a filter for the characteristic absorption wavelength....
Article
Recently, Fabry–Perot IR-absorbing structures have been proven suitable as low cost detectors in non-dispersive infrared (NDIR) gas-sensors for measuring diluted gases (e.g., CO2) in a pure nitrogen (N2) atmosphere. To identify the monitoring capability of the devised prototype system in ambient air, the cross-sensitivity to other gases, mainly wat...
Article
Full-text available
Recently, Fabry–Perot IR-absorbing structures have been proven suitable as low cost detectors in non-dispersive infrared (NDIR) gas-sensors for measuring diluted gases (e.g., CO2) in a pure nitrogen (N2) atmosphere. To identify the monitoring capability of the devised prototype system in ambient air, the cross-sensitivity to other gases, mainly wat...
Article
Many gas molecules absorb electromagnetic radiation at characteristic wavelengths in the infrared region. This absorption can be used to identify defined substances like CO<sub>2</sub>, ammoniac, and so forth. A lot of different types of gas sensors are based on the principle of infrared absorption like photoacoustic sensors (e.g., Golay cells), di...
Article
Every gas (e.g. CO2) absorbs IR-radiation at individual gas specific IR-wavelengths. Non-dispersive infrared (NDIR) gas sensors exploit this property for gas monitoring. Such sensors are used in various applications, e.g. for control of air quality in office buildings or cars. This is a big market for low cost sensors. A NDIR sensor consists basica...
Article
Full-text available
We report on the design of a simple germanium bolometer designed as a Fabry-Perot absorbing structure, which can be used for monitoring, e.g., CO2, where no additional filter is required. CO2 is absorbs IR radiation in a major band centered around 4.26μm. The selectivity of the whole sensor-configuration is mainly accomplished by the wavelength-res...

Citations

... Based on this, germanium (n Ge ≈4 [10]) is a suitable element for this layer. The thickness of this layer has to be equal to an odd multiple of a quarter wavelengths in the material [11]. That results in a minimum thickness (corresponding to a quarter wavelength-structure) of ...
... Unlike CRDS, OA-ICOS does not require sophisticated optical and electronic components for the optical mode matching and coupling of the single-frequency laser to the optical cavity modes [23]. Among these techniques, NDIR technology has been widely used to determine CO 2 concentrations [24][25][26][27][28][29][30]. As an application of infrared spectroscopy, NDIR technology has been used to detect air pollutants that can absorb the infrared spectrum [31]. ...
... Spectroscopy information is widely used to identify different matter and has a lot of applications, such as sensors [1,2] , multispectral detection [3][4][5][6] , and remote sensing [7,8] . For conventional multispectral detection systems [9,10] , their wavelength division device and detector are separated and require mechanical or electrical scanning to obtain different spectral information. ...
... Infrared imaging technology is progressively shifted from military application (night vision, mine detection) to commercial demand including medical imaging, and industrial safety monitoring in recent years (Rogalski 2011;; (Mayrwoeger et al. 2010). Some newly appeared and extensive medical applications need fast, non-invasive and non-contact IR (Infrared) detectors (Lahiri et al. 2012). ...
... Many gas molecules absorb electromagnetic radiation at characteristic wavelengths in the infrared region (Mayrwoger et al., 2010). This absorption can be used to identify defined substances like CO 2 , ammonia, and so forth. ...