Sensing Displacement by Measuring Acoustic Pressure

A Finite Element Analysis of Fiber Optic Acoustic Sensing Mandrel for Acoustic pressure with Increased Sensitivity

This paper investigates the influence of material properties on the performance of an optical fiber wound mandrel composite fiber optic interferometer mandrel by using the ANSYS Cad tool, The acoustic sensitivity of an optical fiber considered analytically, High sensitivity obtained with low young modulus, very thick polymer coatings. The thick coating realized by embedding optical fiber in pol...

Measuring acoustic habitats

1. Many organisms depend on sound for communication, predator/prey detection and navigation. The acoustic environment can therefore play an important role in ecosystem dynamics and evolution. A growing number of studies are documenting acoustic habitats and their influences on animal development, behaviour, physiology and spatial ecology, which has led to increasing demand for passive acoustic ...

Relativistic corrections in displacement measuring interferometry

Displacement measuring interferometry is based on measuring the Doppler frequency shift that a beam of radiation undergoes upon reflection off a mirror connected to a moving stage. Usually the velocity of the reflecting stage is very small compared to the speed of light and is therefore deduced using the classical expression for the Doppler shift. We calculate relativistic corrections to the Do...

Ultrasensitive displacement sensing using photonic crystal waveguides

We present an ultrasensitive displacement sensor and sensing technique based on photonic crystal waveguides sPCWGd, useful for integration with microelectromechanical system sMEMSd structures. The sensor consists of two PCWGs aligned along a common axis, one mounted on a moving part and the other fixed to a stationary substrate. A gap between the fixed and moving PCWGs creates an intersection w...

Measuring Nasal Volumes with Acoustic