Surface wave sensor
First Claim
Patent Images
1. A surface acoustic wave sensor comprising:
- a sensor body havinga central part and opposite smoothed edge zones outward of the central part;
an antenna for the body,a transducer for converting electromagnetic waves at the antenna into mechanical waves which run along the sensor body;
first reflectors on the sensor body and inward of the edge zones for together detecting changes in the spacing between the first reflectors due to change in the body; and
additional reflectors arranged at one of the smoothed edge zones in order to reflect signals which are used for evaluation of the current temperature.
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Abstract
A surface acoustic wave sensor is applied to an object by an adhesive. There are reflectors on the sensor body used to determine expansion and contraction. Additional reflectors on a smoothed edge zone of the body remain at the same distance apart and the sensor temperature is determined from the difference signal between these reflectors. The edge zone is without the adhesive.
12 Citations
4 Claims
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1. A surface acoustic wave sensor comprising:
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a sensor body having a central part and opposite smoothed edge zones outward of the central part; an antenna for the body, a transducer for converting electromagnetic waves at the antenna into mechanical waves which run along the sensor body; first reflectors on the sensor body and inward of the edge zones for together detecting changes in the spacing between the first reflectors due to change in the body; and additional reflectors arranged at one of the smoothed edge zones in order to reflect signals which are used for evaluation of the current temperature. - View Dependent Claims (2, 3, 4)
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Specification