SENSOR DEVICE INCLUDING A SENSOR FOR CARRYING OUT SURROUNDING-AREA MONITORING WITH THE AID OF SONIC WAVES
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United States of America Patent
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Issued Date -
May 6, 2021
app pub date -
Jan 11, 2018
filing date -
Feb 27, 2017
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Abstract
A sensor device, including a sensor having a sound transducer to emit sonic waves and convert received sonic waves to electrical signals. A sensor evaluation unit carries out surrounding-area monitoring during a normal operation of the sensor, by evaluating electrical signals of the sound transducer. During a monitoring mode of the sensor, a monitoring unit of the sensor device measures an impedance of the sound transducer for different excitation frequencies of excitation signals produced with a signal generator of the sensor device. The sensor device includes a first and a second signal path, which are each connected to the sound transducer and are connectable to the signal generator. To reset the sensor from normal operation to the monitoring mode, a first control unit of the sensor device is configured to decouple the signal generator from the first signal path and to connect it to the second signal path.
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