Apparatus to study and classify liquids and gases, e.g. beer, has an ultrasonic signal transmitter and receiver with a signal processing unit to compute the phase shift between transmitted and received signals

摘要

The apparatus to study liquids and gases has an ultrasonic transmitter and receiver, and a processor to determine the phase shift between the transmitted and received signals. The transmitter (6) sends out ultrasonic signals at different frequencies, for reception at the receiver (9). The apparatus to study liquids and gases has an ultrasonic transmitter and receiver, and a processor to determine the phase shift between the transmitted and received signals. The transmitter (6) sends out ultrasonic signals at different frequencies, for reception at the receiver (9). The signal processing unit (13) computes at least one qualifying value for the liquid/gas, through the phase shift value, by comparison with a reference phase shift value. The transmitter has a modulator (3), and a generator (4) which is also linked to the signal processing unit. The signal processing unit uses two multiplexers (7,11).