NDLI: Signal processing for smart ultrasonic sensors

Content Provider	IEEE Xplore Digital Library
Author	Magori, V.
Copyright Year	1989
Description	Author affiliation: Siemens AG, Munich, West Germany (Magori, V.)
Abstract	As typical smart sensors, ultrasonic sensors evaluate the information impressed on the propagating ultrasonic signal by the quantities to be sensed. Besides the ultrasonic transmission, reception, and time-dependent amplification, elementary signal processing includes time measurement, time-window evaluation, and phase detection. Flow velocities can be measured with high resolution and independently of the speed of sound using the lambda-locked loop (LLL). With echo profiles, advanced techniques such as object recognition by partial echoes are possible. These can be enhanced by deconvolution or inverse filtered transmission with respect to the normal echo of a plane surface. Similarly, objects and positions are recognized by using their echo profiles as the normal echo. For echo profiles from different positions (sensor in motion or in arrays), lateral structures are resolved by synthetic aperture or holography. The development of smart ultrasonic sensors will be stimulated by the future VLSI signal processor components. As examples of readily available smart ultrasonic sensors, a range of presence detectors and a heat meter with an LLL flow sensor are presented.<>
File Size	595943
File Format	PDF
ISBN	0818619406
DOI	10.1109/CMPEUR.1989.93400
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1989-05-08
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Signal processing Intelligent sensors Sensor arrays Signal resolution Thermal sensors Acoustic sensors Acoustic propagation Time measurement Phase detection Fluid flow measurement
Content Type	Text
Resource Type	Article

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