This paper reports for the first time a planarised optical fiber composite formed using Flame Hydrolysis Deposition (FHD). As a way of format demonstration a Micro-Opto-Electro-Mechanical (MOEMS) hot wire anemometer is formed using micro-fabrication processing. The planarised device is rigidly secured to a silicon wafer using optical quality doped silica that has been deposited using flame hydr...

We discuss two types of micromachined flow sensors realized by using novel microfabrication processes—a hot-wire anemometer ~based on thermal transfer! and a biologically inspired flow sensor ~based on momentum transfer!. Both sensors are enabled by a new, efficient three-dimensional assembly technique called the plastic deformation magnetic assembly method. The sensors can be packaged in high-...

Abstract A sensitivity-enhanced hot-wire anemometer based on a cladding-etched optical fiber Bragg grating (FBG) coated with layer of silver film and optically heated by using 1480 nm laser diode is demonstrated. The absorbs the power to heat FBG certain high temperature airflow cools down cooling effect hence wavelength determined velocity. Experimental measurement results show that heating ef...

We report the first evidence of an enhancement of the heat transfer from a heated wire to an external turbulent coflow of superfluid helium. We used a standard Pt-Rh hot-wire anemometer and overheat it up to 21 K in a pressurized liquid helium turbulent round jet at temperatures between 1.9 K and 2.12 K. The null-velocity response of the sensor can be satisfactorily modeled by the counterflow m...

Turbulence structure on the gas side of a wavy stratified flow was experimentally investigated in a near horizontal 18.7 cm (H) 10 cm (W) 5.5m (L) rectangular duct.By applying the Variable Interval Time Averaging (VITA) technique to the hot wire anemometer measurements frequency of occurrence of turbulent events were detected near the air-water interface. Experimental results showed that fr...

turbulence structure on the gas side of a wavy stratified flow was experimentally investigated in a near horizontal 18.7 cm (h) 10 cm (w) 5.5m (l) rectangular duct.by applying the variable interval time averaging (vita) technique to the hot wire anemometer measurements frequency of occurrence of turbulent events were detected near the air-water interface. experimental results showed that freque...

Air flow measurement at the outlets of air terminal devices installed in ventilation systems is very difficult. At anemostats, swirl diffusers, grilles, can swirl, contract, or expand sharply, change its direction, etc., which causes great errors. Therefore, it was necessary to develop a universal measuring device that would make possible measure rate with high accuracy. It should consist an co...