UVP Monitor uses ultrasound, and PIV (Particle Image Velocimetry) or LDA (Laser-Doppler Anemometry) uses light. Both methods therefore do not interfere, and can be used simultaneously.
The typical ultrasonic flow-meter uses the principle of transit time of ultrasonic pulse which is carried by the flow. It measures the time difference from the sound speed between transmitter and receiver with some fixed distance. This method measures an average velocity in a measured field like a pipe so that some kind of theoretical assumption is needed to evaluate an integral of the velocity distribution over a flow channel. This requires some strict conditions for the flow to be measured such as an entry length upstream the measured position. On the other hand, UVP measures the velocity profile directly so that the evaluation of integral is direct, requiring no strict measuring conditions. Moreover, the theoretical assumption used for the conventional devices are normally valid for the stationary flow. This eliminates the possibility of measuring a transient flow-rate after pump start or valve operation. UVP can measure the velocity profile instantaneously, and thus the transient measurement is also possible and accurate.
Probably there is. Please check Met-Flow contact list to get in touch with the closest commercial representative, or contact Met-Flow directly to get any specific references.
Price on request. Please check Met-Flow contact list to get in touch with the closest commercial representative.