Communications – electrical: acoustic wave systems and devices – Signal transducers
Patent
1997-04-28
1998-03-10
Eldred, J. Woodrow
Communications, electrical: acoustic wave systems and devices
Signal transducers
367158, 367159, 367162, 367163, 367174, 310322, H04R 1700
Patent
active
057269521
ABSTRACT:
A sound or ultrasound sensor is provided for transmitting and/or receiving sound or ultrasound, which is mechanically robust and chemically resistant and which has an adjustable emission characteristic, for example having a preferably small beam angle, having an emitting element (3) which has a flat front surface (34), and having a transducer element (1), the transducer element (1) causing the front surface (34) to oscillate on the basis of an excitation frequency, such that the entire front surface (34) carries out virtually in-phase deflections with virtually equal amplitude parallel to the normal to the front surface (34), and in which sensor concentric webs (32) are arranged on the front surface, there being a concentric gap (33) in each case between two adjacent webs (32), and a disk (5) sealing the sound or ultrasound sensor flush at the front, which disk is firmly connected to the webs (32) and has segments which are not connected to the webs (32) and are used as membranes (51).
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Noell, H., "Data processing in ultrasound-based liquid level-measuring instruments", Technisches Messen, 51. Jahrgang, 1984.
Eckert Manfred
Flogel Karl
Eldred J. Woodrow
Endress & Hauser GmbH & Co.
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