Patent ID: 11927437
Assignee: EVIDENT SCIENTIFIC, INC.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 19:
20. A measurement apparatus for measuring a tube having a tube outer surface, the apparatus comprising:
at least one ultrasonic probe configured to emit an ultrasonic beam and to receive a response signal;
a measurement assembly configured to be mounted on the tube outer surface, to hold the probe and to cause a relative rotation between the probe and the tube outer surface, the rotation being about a tube axis for determination of a series of respective distances corresponding to the time of flight measurements by a test acquisition unit in communication with the at least one ultrasonic probe;
a Fourier transform calculation circuit configured to transform the series of respective distances into a spatial frequency domain; and
an inverse Fourier transform calculation circuit communicatively coupled with an average diameter calibrator for determining an average diameter of the tube outer surface using an inverse transform of a spatial frequency domain representation of the respective distances corresponding to a specified harmonic, the determining the average diameter including compensating for a couplant temperature of a couplant used to acoustically couple the ultrasonic probe to the tube outer surface.