Abstract: An ultrasonic sensor detects a liquid level. A substrate (707) has an acoustic array (705). An acoustic diversion array (710) can be between a substrate edge (713) and the acoustic array. A sensing region (701) can lay next to the acoustic array opposite the acoustic diversion array. A collimation groove (706) can be in the substrate along a length of the acoustic array next to the liquid level sensing region. Multiple longitudinal folds (801, 802, 803) can run parallel to and between acoustic source and receive arrays. A feed strip (1201, 1202, 1309, 1311) can be used with a bend (1203, 1204) acoustically coupled to the acoustic array and an ultrasonic transducer at another end of the feed strip. The feed strip runs along the entire acoustic array when top fed and runs along part of the acoustic array when fed through a side of a tank (1401).

Abstract: An ultrasonic sensor detects a level of a fluid. A first probe has a first transducer element to transmit an ultrasonic signal through the first probe. A second probe of a helix shape has a second transducer element coiled around the first probe to receive the ultrasonic signal transmitted by the first probe through the fluid. A stabilizing rod and a plurality of stabilizing collets are disposed between the rod and the second probe parallel to both the first probe and the second probe.