Micro displacement sensor design based on photonic crystal emulating MOEMS for detection of acoustic signals

This paper explores the detection of the acoustic signals underwater with a MOEMS structure. The movement of the micro optical elements, which manipulates the light passes through all the dimensional spaces, is what constitutes MOEMS technology, which stands for micro opto-electro mechanical systems. These are used to detect stress, strain and other mechanical parameters based on the displacement. The technology about the mechanical part of the sensing layer, modeled device, used material and the properties of the acoustic wave for streamlines across the buoyant surfaces gives information of the hydrodynamics of sharp structures. The mechanical properties of the rods are allowed to undergo transformation with applied energy which then allows conversion into corresponding changes in electrical and optical properties of the device in the closed system of observation. By using these coupled-optical properties the MOEMS based mechanical structure can be used for flow-metry, leakage detection, blood-pressure monitoring, structural health monitoring among others. In this paper, we investigated a design of a photonic crystal micro-displacement sensor. A theoretical model is constructed to approximate the change of the refractive index impelled by the application of a pressure over a sensing surface. By the actuation of the sensing layer, a linear calibration curve is got by relating the resonant drop location to the applied pressure at a point on the surface. This is what MEMS does and with a photonic crystal sensing technology, it has improved the sensitivity and stability of the sensor. Thus we are promised with this to be successfully implemented in damage detection of civil and military structures under water. The simulation tool used in the paper is MEEP and MATLAB.