Patent ID: 6073492
Filing Date: 2000-06-13
Classification: G01F,G01N

Abstract:
An ultrasonic sensor comprising:an ultrasonic transmitter;an ultrasonic receiver;a support structure;first and second elongated tubes which are mechanically coupled to and extend from the support structure;a first elongated waveguide which is operably coupled to the ultrasonic transmitter and extends through the support structure and a bore in the first tube, wherein the first waveguide is acoustically isolated from the support structure and the first tube except at a distal portion of the first tube;a first acoustic coupling between a distal portion of the first waveguide and the distal portion of the first tube;a second elongated waveguide which is operably coupled to the ultrasonic receiver and extends through the support structure and a bore in the second tube, wherein the second waveguide is acoustically isolated from the support structure and the second tube except at a distal portion of the second tube;a second acoustic coupling between a distal portion of the second waveguide and the distal portion of the second tube; anda measurement gap located between the distal portions of the first and second waveguides.