Doppler Measurement Ultrasonic Flow Meters

Doppler Flow Meters will monitor the flow of liquids in awkward applications, including: effluent, chemicals, acids, slurries, caustic/abrasive fluids and viscous liquids.

Dynaflox Doppler ultrasonic flow meters are designed to measure the flow of liquids that contain sound reflectors suspended solids or gas bubbles. Available in three separate product styles to accommodate a variety of customer applications, the DMDFB family of products includes non-invasive meters as well as an insertion probe for applications where the pipes do not readily pass ultrasound, such as concrete, FRP/GRP or wooden materials.

Operating Principle

Each Doppler flow meter utilizes two piezoelectric ceramics contained within either two separate transducer heads, one transducer head or the probe tip of the insertion model. Sound is transmitted from one of the ceramic, reflected by useful sonic reflectors suspended within the liquid and recorded by the receiving transducer. If the reflectors are moving within the sound transmission path, sound waves will be reflected at a frequency shifted (Doppler shift) from the transmitted frequency. The difference between the reflected frequencies and transmitted frequencies is directly proportional to the speed of the sonic reflectors, resulting in a liquid flow rate that is converted to various user defined measuring units.