NDLI: Pulsed phase locked loop strain monitor

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Pulsed phase locked loop strain monitor

Content Provider	NASA Technical Reports Server (NTRS)
Copyright Year	1995
Description	A pulse phase locked loop system according to the present invention is described. A frequency generator such as a voltage controlled oscillator (VCO) generates an output signal and a reference signal having a frequency equal to that of the output signal. A transmitting gate gates the output frequency signal and this gated signal drives a transmitting transducer which transmits an acoustic wave through a material. A sample/hold samples a signal indicative of the transmitted wave which is received by a receiving transducer. Divide-by-n counters control these gating and sampling functions in response to the reference signal of the frequency generator. Specifically, the output signal is gated at a rate of F/h, wherein F is the frequency of the output signal and h is an integer; and the received signal is sampled at a delay of F/n wherein n is an integer.
File Size	1217141
Page Count	18
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20080004786
Archival Resource Key	ark:/13960/t2x39qf0p
Language	English
Publisher Date	1995-04-11
Access Restriction	Open
Subject Keyword	Electronics And Electrical Engineering Patents Phase Locked Systems Voltage Controlled Oscillators Systems Engineering Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Patent

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