CO2 isotope sensor using a broadband infrared source, a spectrally narrow 4.4 μm quantum cascade detector, and a Fourier spectrometer

We report a prototype CO2 gas sensor based on a simple blackbody infrared source and a spectrally narrow quantum cascade detector (QCD). The detector absorption spectrum is centered at 2260cm−1 (4.4μm) and has a full width at half maximum of 200cm−1 (25meV). It covers strong absorption bands of two spectrally overlapping CO2 isotopomers, namely the P-branch of 12CO2 and the R-branch of 13CO2. Acquisition of the spectral information and data treatment were performed in a Fourier transform infrared (FTIR) spectrometer. By flushing its sample compartment either with nitrogen, dry fresh air, ambient air, or human breath, we were able to determine CO2 concentrations corresponding to the different gas mixtures. Adetection limit of 500ppb was obtained in these experiment

Detection of protein aggregation with a Bloch surface wave based sensor

We present the innovative application of a Bloch surface wave based sensor to the detection of protein aggregation. In Hen Egg White Lysozyme (HEWL) solutions, aggregates are discriminated from the monomeric forms in a label-free detection scheme

Efectos del modelo de tierra en cálculos teóricos de de formación del terreno

[ES] En este ai-tículo se estudian los efectos del modelo de Tierra empleadoen los cálculos teóricos de deformación y variaciones de gravedad causados en campo cercano por una intrusión magmática considerada puntual. Para ello se revisan los resultados obtenidos en medios elásticos y elástico-gravitatorios, así como homogéneos y estratificados. Se comparan también los resultados obtenidos considerando modelos de Tierra elástico-gravitatoria y termo-elástica en los modelos teóricos de deformación.[EN] In this paper we study the efi’ects of the Earth model used in theoretical computations of gravity changés and deformation in the near field dne to a magmatie intrusion which is assumed as a point source. To carry out this we summarized te previous results obtained using elastic and elastic-gravitational media as well as homogeneous and layered ones. Wc also compare the obtained results considering a elastie-gravitational and thermo-elastic Earth models in deformation modelling.Los autores estamos agradecidos a la Siovak Graní Agency for Science (grant N0 2/1063) por la financiación parcial de este trabajo. La investigación de 1. Fernández y R. d. R. Granelí se sufragó con cargo al proyecto EV5VCT93- 0283 dentro del Programa de Medioambiente de la Unión Europea.Peer reviewe

IFLA journal

We report a prototype CO2 gas sensor based on a simple blackbody infrared source and a spectrally narrow quantum cascade detector (QCD). The detector absorption spectrum is centered at 2260 cm−1 (4.4 μm) and has a full width at half maximum of 200 cm−1 (25 meV). It covers strong absorption bands of two spectrally overlapping CO2 isotopomers, namely the P-branch of 12CO2 and the R-branch of 13CO2. Acquisition of the spectral information and data treatment were performed in a Fourier transform infrared (FTIR) spectrometer. By flushing its sample compartment either with nitrogen, dry fresh air, ambient air, or human breath, we were able to determine CO2 concentrations corresponding to the different gas mixtures. A detection limit of 500 ppb was obtained in these experiments