Patent ID: 8601877
Filing Date: 2013-12-10
Classification: G01L,G01N

Abstract:
1. An ultrasonic measurement method comprising: (a) acoustically coupling an ultrasonic transducer to an object to be measured by means of a resilient material contact layer; (b) transmitting, by using said transducer, a plurality of consecutive ultrasonic transmit signals into said object being measured, so that the signals travel from the transducer to an end of the object where the transmit signal is reflected and where a transmit frequency of each of said plurality of transmit signals is distinct from the frequency of the other transmit signals of said plurality of transmit signals; (c) selecting, based on received signal echoes, at least one transmit frequency to be used for ultrasonic measurement of said object; and (d) transmitting, during measurement, signals into said object using the selected transmit frequency and receiving signal echoes of said transmit signals, wherein said signal echoes are detected by demodulation in two orthogonal channels, so as to allow determination of a phase of a signal echo with respect to the selected transmit signal.