ULTRASONIC WAVE FLOW METER USING CORRELATION

摘要

It discloses an ultrasonic flow meter using the cross-correlation. Ultrasonic flow meters using the cross-correlation of the invention, a first phase comparator for performing phase comparison of the received signal and the transmitted signal; First low-pass filter for passing a low frequency the phase comparison output; An integrator for integrating the output signal of the phase comparator; Compensation circuit of the second phase comparator for performing phase comparison between the output signal and the transmission signal of its own; Second low-pass filter that passes a low frequency phase comparison output; And characterized by receiving the output signal from the integrator and the signal plus the second output value of the low-pass filter made up by a voltage controlled oscillator that generates and outputs a signal that follows the transmission signal. According to the invention, as well as be less affected by the measurement object type of fluid, the pressure, the reproducibility is excellent, and can be measured in real-time flow rate in a precise value. And, so the mobility and applicability superior to the flow rate measurement is possible without having to disassemble the pipe from the field because the outer wall-mounted (Clamp On Type) adhering to the outer pipe.