A fiber Bragg based semi distributed pressure sensor system for in-vivo vascular applications

An overview of a fiber Bragg based sensor system, developed for in-vivo vascular pressure and temperature sensing, is presented. The focus is on sensor miniaturization and interrogator optimization to reach a viable sensor system.

Fibre laser hydrophones for cosmic ray particle detection

The detection of ultra high energetic cosmic neutrinos provides a unique means to search for extragalactic sources that accelerate particles to extreme energies. It allows to study the neutrino component of the GZK cut-off in the cosmic ray energy spectrum and the search for neutrinos beyond this limit. Due to low expected flux and small...

Development of IR single mode optical fibers for DARWIN-nulling interferometry

The DARWIN mission aims to detect weak infra-red emission lines from distant orbiting earth-like planets using nulling interferometry. This requires filtering of wavefront errors using single mode waveguides operating at a wavelength range of 6.5-20 μm. This article describes the optical design of the fibers, the manufacturing protocol, the...

Fiber based hydrophones for ultra-high energy neutrino detection

It is a well studied process [1, 2] that energy deposition of cosmic ray particles in water that generate thermo-acoustic signals. Hydrophones of sufficient sensitivity could measure this signal and provide a means of detecting ultra-high energetic cosmic neutrinos. We investigate optical fiber-based hydrophone technology that could potentially...

Een gevoelig oor voor neutrino's

Sinds de ontdekking van kosmische straling zijn veel verchillende detectoren ontwikkeld om dit fenomeen te onderzoeken. Nieuw in het rijtje is de optische hydrofoonsensor, waarmee naar hoogenergetisache neutrino's gespeurd kan worden.

Special optical fiber design to reduce reflection peak distortion of a FBG embedded in inhomogeneous material

During the last decades, the use of optical fiber for sensing applications has gained increasing acceptance because of its unique properties of being intrinsically safe, unsusceptible to EMI, potentially lightweight and having a large operational temperature range. Among the different Fiber Optic sensor types, Fiber Bragg Grating (FBG) is most...

Lateral-load-insensitive fiber for the suppression of spectral distortion of an FBG embedded in inhomogeneous material

Applying an inhomogeneous lateral load to an FBG will result in distortion of the reflection spectrum due to the Poisson effect. A solution based on a special fiber is proposed and first results are shown.

Experimental confirmation of universal relations for microring resonators in SOI technology

We present a detailed characterization of a set of microring resonators with bent radii of 1.5 μm, fabricated in silicon-on-insulator technology. Results are in good agreement with the universal relations for coupling between microresonators and dielectric waveguides.

Silicon integrated optomechanical sensors

SOI based integrated on-chip photonic pressure sensor

A compact, mass producible Silicon On Insulator (SOI) based pressure sensor consisting of a folded Micro Ring Resonator (MRR) on a circular diaphragm is successfully designed, fabricated and characterized [1-3]. The MRR is designed to be single mode for TE polarized light at 1550 nm. The folded MRR has a total length of 1500 μm which is folded...

SOI based mechano-optical pressure sensor using a folded micro ring resonator

A compact, mass producible Silicon On Insulator (SOI) based pressure sensor consisting of a folded Micro Ring Resonator (MRR) on a circular diaphragm is successfully designed, fabricated and characterized. An application of pressure deflects the diaphragm, causing stress in the MRR, which elongates the waveguide length and changes the effective...

Development of a FBG vortex flow sensor for high-temperature applications

A robust fibre optic flow sensor has been developed to measure liquid or gas flows at ambient temperatures up to 300°C and pressures up to 100 bar. While such environmental conditions are typical in pressurized steam systems in the oil and gas industry (downhole and surface), wider applications are envisaged. The flow sensor uses a specially...

Fiber Bragg grating sensors

A brief overview of fiber Bragg grating based sensor technology from sensor head, read out unit and commercial applications is given. Fiber Bragg grating based sensor systems are becoming mature rapidly. Components for commercial pressure sensors and temperature sensors are available and slowly getting accepted. However, many advantages of the...

Towards a fibre to waveguide coupling scheme

Silicon based SOI PICs are finding new applications in the field of sensing. Since Silicon does not produce light, to deploy these sensors in real-world applications a fiber-chip connection is required. In this work we detail the fabrication of V-grooves for fiber attachment to the chip, including the design, (hard) masking and the etching...

Commercial soi sensor technology