Dopplerárammér

Dopplerárammér is a device used to measure fluid flow velocity. It operates based on the Doppler effect, a phenomenon where the frequency of a wave changes when the source or observer is moving. In the case of a Dopplerárammér, sound waves or electromagnetic waves are transmitted into the fluid. These waves then reflect off moving particles within the fluid, such as suspended solids or gas bubbles.

As these particles move towards the transmitter, the reflected waves have a higher frequency. Conversely, if the particles are moving away, the reflected waves have a lower frequency. The Dopplerárammér detects this shift in frequency and uses it to calculate the velocity of the fluid. The magnitude of the frequency shift is directly proportional to the velocity of the fluid.

Dopplerárammérs are non-invasive, meaning they do not require direct contact with the fluid being measured, which is advantageous for applications involving corrosive or sensitive fluids. They are widely used in various industries, including water treatment, chemical processing, and medical applications like blood flow measurement. Different types of Dopplerárammérs exist, utilizing ultrasound or radar frequencies, depending on the specific application and the nature of the fluid. The accuracy of the measurement depends on factors such as the concentration of reflective particles in the fluid and the angle of the transmitted waves.