Fluid flow rate meter - uses ultrasonic transmitters, disturbance detectors, one-bit polarity samplers and correlation techniques

摘要

The relative velocity between two bodies or one body and a fluid is measured by at least two detectors (Ra-Rd) to detect noise signals representing disturbances and a circuit producing at least two auto-cross-correlation curves from the detector signals. The correlation curve for computing the relative velocity. Pref. the detectors are arranged in pairs, the detectors in each pair being spaced along the direction of relative movement. A cross-correlation curve data set is produced from each pair.