Publications de Desmond Chow Ming Chia

Opto-acoustics in optical fibres for sensing applications

Luc Thévenaz, Zhisheng Yang, Desmond Chow Ming Chia

IEEE2019

Brillouin Distributed Optical Fiber Sensor Based on a Closed-Loop Configuration

Luc Thévenaz, Zhisheng Yang, Pabitro Ray, Marcelo Alfonso Soto Hernandez, Desmond Chow Ming Chia

A Brillouin optical time-domain analysis (BOTDA) method based on a closed-loop control system is proposed to track fast variations of the Brillouin frequency shift along the sensing fiber. Whilst the method eliminates the gain spectral scanning, the exact ...

IEEE Institute of Electrical and Electronics Engineers2018

Forward Brillouin scattering acoustic impedance sensor using thin polyimide-coated fiber

Luc Thévenaz, Desmond Chow Ming Chia

The standard single-mode fiber has been demonstrated as an optomechanical sensor recently to measure the acoustic impedances of surrounding liquids by means of the generation and detection of forward-stimulated Brillouin scattering (FSBS). FSBS allows the ...

2018

Opto-acoustic chemical sensor based on forward stimulated Brillouin scattering in optical fiber

Luc Thévenaz, Desmond Chow Ming Chia

Stimulated Brillouin scattering is well-known for providing distributed measurements in the field of optical fiber sensing. For the conventional backward stimulated Brillouin scattering, the sensing capability is nevertheless limited to temperature and mec ...

IEEE2018

Exploring the use of native spider silk as an optical fibre for chemical sensing

Luc Thévenaz, Kenny Hey Tow, Isabelle Dicaire, Desmond Chow Ming Chia

A spider uses up to seven different types of silk, all having specific functions, as building material, weapon and sensory organ to detect the presence of preys on its web. Recently, scientists have put under the limelight the extraordinary properties of t ...

IEEE Institute of Electrical and Electronics Engineers2018

Distributed Acoustic Impedance Measurement Based On Forward Stimulated Brillouin Scattering

Luc Thévenaz, Marcelo Alfonso Soto Hernandez, Zhisheng Yang, Desmond Chow Ming Chia

A technique to measure the local spectrum of forward stimulated Brillouin scattering (FSBS) along a standard optical fiber is proposed. The local acoustic impedance of surrounding material is retrieved from the measured FSBS resonance linewidth. ...

Optical Society of America2018

Polyimide Coated Fiber as Optomechanical Sensor

Luc Thévenaz, Desmond Chow Ming Chia

A commercially available optical fiber coated with 8 µm-thickness polyimide is used for measuring the acoustic impedance of the surrounding liquid materials, by means of the generation and detection of forward stimulated Brillouin scattering (FSBS). ...

Optical Society of America2018

Distributed forward Brillouin sensor based on local light phase recovery

Luc Thévenaz, Marcelo Alfonso Soto Hernandez, Zhisheng Yang, Desmond Chow Ming Chia

The distributed fibre sensing technology based on backward stimulated Brillouin scattering (BSBS) is experiencing a rapid development. However, all reported implementations of distributed Brillouin fibre sensors until today are restricted to detecting phys ...

Nature Research2018

Distributed analyses using distinct classes of Brillouin scatterings in optical fibres

Desmond Chow Ming Chia

Brillouin scattering is an interaction between light and sound in a material. This inelastic light scattering had been observed in the first optical fibres that were used in cross-continent communication. Via Brillouin scattering, the guided light wave in ...

EPFL2018

From Spider Webs to a Biomimetic Optical Fibre Sensor

Luc Thévenaz, Kenny Hey Tow, Isabelle Dicaire, Desmond Chow Ming Chia

Can we use spider silk threads as natural, biological optical fibre sensors? In this communication, we will see how we can harness the optical properties of spider dragline silk and use it for sensing. ...

2018