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Measurements of the ultrasonic sound speed of thermosetting resins and composites can be used as an in‐process cure monitoring technique. Ultrasonic measurements have an advantage over other in‐process techniques in that ultrasonic sensors do not make contact with the part (thus leaving no...
To ensure the reliable monitoring of machining operations, e.g. by lathes, the forces generated during the metal removal process must be detected with the utmost precision. Almost every type of lathe can be straightforwardly monitored for these factors with a force sensor which not only measures...
A binaural sonar sensor for blind persons which models the bat sonar is described. System performance with field plots are presented along with signal analysis on objects forming targets. The distal spatial resolution is little more than one wavelength at the lowest frequency of 50 kHz. The...
Continuous Transmission Frequency Modulated (CTFM) ultrasonic sensors can be used to recognise plants. The echo from a plant is modelled as an acoustic density profile. Classification based on features extracted from the echo is more robust than classification based on the echo. Potential...
This paper describes the principles of the a.c. field measurement technique, a non-contacting electromagnetic method of crack detection and sizing in metals. The development of the technique is covered, followed by examples of some of the many different applications the technique has been used...
A new approach to rejecting interference between sonar systems is presented in this paper. The approach is based on identifying a transmitter by sending a double pulse with known separation. Using simple delayed pulse subtraction, a sonar receiver can test echo pulses quickly and simply for...
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