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Concept

Photoacoustic spectroscopy

Publications associées (28)

High-pressure infrared spectroscopy: Tuning of the low-energy excitations in correlated electron systems

László Forró, Helmuth Berger, Richard Gaal, Balazs Sipos

We have extended the range of the high-pressure optical spectroscopy to the far-infrared region keeping the accuracy of ambient-pressure experiments. The developed method offers a powerful tool for the study of pressure-induced phase transitions and electr ...

2007

Optical Sensor for the Detection of OH- Contamination during Optical Fibre Manufacturing

Luc Thévenaz, Jean-Philippe Besson

Sub-ppm (HCl) and (H2O) monitoring using photoacoustic spectroscopy is reported in optical fibre manufacturing for the production of low-water-peak fibres. Contamination sources of the carrier gas used for fibre preforms manufacturing were identified and d ...

Optical Society of America2006

Photoacoustic spectroscopy for multi-gas sensing using near infrared lasers

Jean-Philippe Besson

Photoacoustic spectroscopy is a widely recognised technique to measure trace gases at parts-per-million (ppm) or parts-per-billion (ppb) level using semiconductor laser in the near infrared range. This technique is based on the generation of an acoustic wa ...

EPFL2006

Multi-hydrogenated compounds monitoring in optical fibre manufacturing process by photoacoustic spectroscopy

Luc Thévenaz, Jean-Philippe Besson

Sub-ppm hydrogen chloride (HCl) and water vapour (H2O) monitoring using photoacoustic spectroscopy in optical fibre manufacturing is reported. The development and performance of a sensor based on an acoustic resonant configuration is described, and on-site ...

Springer Verlag2006

Near-infrared laser photoacoustic detection of methane: The impact of molecular relaxation

Luc Thévenaz, Jean-Philippe Besson

A photoacoustic sensor has been developed for trace-gas monitoring using a near-infrared semiconductor laser emitting in the 2ν3 band of methane at 1.65 μm. The apparatus was designed for on-line process control in the manufacturing of the novel low-water- ...

Springer Verlag2006

Wavelength modulation photoacoustic spectroscopy: Theoretical description and experimental results

Luc Thévenaz

A theoretical description of photoacoustic spectroscopy generated by wavelength modulation of a semiconductor laser source is reported for a Lorentzian absorption line. This model describes the first- and second-harmonic photoacoustic signals produced by a ...

Elsevier2006

Frequency-stabilised laser reference system for trace-gas sensing applications from space

Luc Thévenaz, Sang Hoon Chin

A four-wavelength low-power continuous-wave frequency laser reference system has been realised in the 935.4-nm range for water vapour differential absorption lidar (DIAL) applications. The system is built around laboratory extended-cavity and DFB diode las ...

ESA2006

Diode laser frequency stabilisation for water-vapour differential absorption sensing

Luc Thévenaz

We describe a low-power continuous-wave laser system for water-vapour sensing applications in the 935-nm region. The system is based on extended-cavity diode lasers and distributed-feedback lasers and delivers four single-mode frequency-stabilised optical ...

Springer Verlag2006