Ultrasonic Echoes
نویسندگان
چکیده
منابع مشابه
Estimation of ultrasonic point echoes
One important parameter for an ultrasonic transducer is the echo it yields from a pointlike reflector. It can be measured directly but there are however certain problems connected with this. We propose an alternative method to calculate the echo from a pointlike reflector by measuring the echoes from sliding halfplanes. Using a tomographic way of reasoning, we can calculate the point echoes fro...
متن کاملDifferentiating walls from corners using the amplitude of ultrasonic echoes
This paper analyzes the use of ultrasonic echo amplitudes to evaluate the characteristics of the detected surfaces (such as distinguishing between walls and corners). The shape and surface characteristics of the environment, such as roughness or absorption coefficient, as well as the distance and the angle of incidence, have high influence on the amplitude of the echoes. As a consequence, the a...
متن کاملSpectral Redundancy in Characterizing Scatterer Structures from Ultrasonic Echoes
Broadband ultrasonic back-scattered energy contains information regarding material structures from which it was scattered. Signal processing techniques use characteristic changes in the back-scattered signals to detect scatterers or reflectors that represent flaws and impurities within a manufactured part. A-scans from materials such as stainless steel, titanium, and composites comprised of den...
متن کاملAccurate Estimation of Airborne Ultrasonic Time-of-Flight for Overlapping Echoes
In this work, an analysis of the transmission of ultrasonic signals generated by piezoelectric sensors for air applications is presented. Based on this analysis, an ultrasonic response model is obtained for its application to the recognition of objects and structured environments for navigation by autonomous mobile robots. This model enables the analysis of the ultrasonic response that is gener...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Circulation
سال: 1971
ISSN: 0009-7322,1524-4539
DOI: 10.1161/01.cir.44.3.487-a