Patent ID: 7966136
Filing Date: 2011-06-21
Classification: G01F

Abstract:
1. A level sensor comprising: a first transducer configured to generate a first signal and including a first output surface that is substantially parallel to a base surface; a second transducer configured to generate a second signal and including a second output surface that is substantially parallel to the base surface, wherein the base surface supports the first transducer and the second transducer; a reference target placed a first distance from the first transducer and a second distance from the second transducer; and a processor configured to switch operation between a first mode and a second mode, and to receive information from the first and second transducers, in the first mode, the processor is configured to in the second mode, the processor is configured to the processor further configured to determine a distance to the surface based on information related to the reflection of the first signal from the surface and the reflection of the second signal from the reference target.