Applicant: Schmitt Measurement Systems Inc, USA
An ultrasonic, liquid level monitoring system, which includes an ultrasonic transducer unit that can be mounted on a tank, forms the subject of this patent. The unit has an emitter to generate an ultrasonic beam which passes through the wall of the tank. The emitter further receives an echo, generated by the ultrasonic beam as it is reflected off the surface of the liquid. An acoustic lens is disposed between the emitter and the tank wall to receive and shape the ultrasonic beam to compensate for ‘lensing effects’ of the wall. Referring to the accompanying figure, an ultrasonic monitoring system (100) is shown for sensing the level of the liquid in a tank (102). The system includes an ultrasonic transducer unit (104) that is externally mounted on the bottom of the tank. The system includes a control unit (106) that is connected to the transducer unit (104) by an electrical cable (108). This cable may be configured to provide a synchronous serial data link. The transducer unit transmits ultrasonic signals through the tank wall and listens for return echoes from the surface of the liquid (not shown) in the tank. The control unit (106) directs the operation of the transducer unit (104) and collects time-of-flight and temperature data from the transducer unit.
Patent number: WO/2009/014790
Inventor: P. Lagergren
Publication date: 29 January 2009
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