DEVELOPMENT OF PHOTONIC VORTEX FLOW METER FOR FLOW RATE MEASUREMENTS AT HIGH TEMPERATURES AND PRESSURES

摘要

The present publication describes a new design of a flow meter for metering fluids using fiber sensing methods. Mach-Zehnder interferometer was implemented for the detection of the vortices. The signal generation is based on the frequency detection of a vibrating diaphragm placed in a specially optimized measuring chamber. The stress of the vibrating diaphragm is sensed using a Mach-Zehnder (MZ) fiber interferometer, with fiber arms fixed to the diaphragm. This solution allows measuring flow rates of liquids, gases and vapors with temperatures up to +700°C and pressures up to 300 bar. Excellent linearity was achieved by numerical flow simulations of the entire meter. The pressure chamber was optimized to minimize the amount of air trapped in it.