Method and means for generating a synchronizing pulse from a repetitive wave of varying frequency
Abstract
An event that occurs repetitively at continuously changing frequencies can be used to generate a triggering pulse which is used to synchronize or control. The triggering pulse is generated at a predetermined percentage of the period of the repetitive waveform without regard to frequency. Counts are accumulated in two counters, the first counting during the "on" fraction of the period, and the second counting during the "off" fraction. The counts accumulated during each cycle are compared. On equality the trigger pulse is generated. Count input rates to each counter are determined by the ratio of the on-off fractions of the event waveform and the desired phase relationship. This invention is of particular utility in providing a trigger or synchronizing pulse during the open period of the shutter of a high-speed framing camera during its acceleration as well as its period of substantially constant speed.
- Inventors:
-
- Lisle, IL
- Westchester, IL
- Lockport, IL
- Issue Date:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- OSTI Identifier:
- 862507
- Patent Number(s):
- 3952253
- Assignee:
- United States of America as represented by United States Energy (Washington, DC)
- Patent Classifications (CPCs):
-
G - PHYSICS G03 - PHOTOGRAPHY G03B - APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM
H - ELECTRICITY H03 - BASIC ELECTRONIC CIRCUITRY H03L - AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- DOE Contract Number:
- W-31109-ENG-38
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- method; means; generating; synchronizing; pulse; repetitive; wave; varying; frequency; event; occurs; repetitively; continuously; changing; frequencies; generate; triggering; synchronize; control; generated; predetermined; percentage; period; waveform; regard; counts; accumulated; counters; counting; fraction; cycle; compared; equality; trigger; count; input; rates; counter; determined; ratio; on-off; fractions; desired; phase; relationship; particular; utility; providing; shutter; high-speed; framing; camera; acceleration; substantially; constant; speed; trigger pulse; desired phase; constant speed; substantially constant; particular utility; synchronizing pulse; triggering pulse; phase relationship; framing camera; varying frequency; /327/377/396/
Citation Formats
DeVolpi, Alexander, Pecina, Ronald J, and Travis, Dale J. Method and means for generating a synchronizing pulse from a repetitive wave of varying frequency. United States: N. p., 1976.
Web.
DeVolpi, Alexander, Pecina, Ronald J, & Travis, Dale J. Method and means for generating a synchronizing pulse from a repetitive wave of varying frequency. United States.
DeVolpi, Alexander, Pecina, Ronald J, and Travis, Dale J. Thu .
"Method and means for generating a synchronizing pulse from a repetitive wave of varying frequency". United States. https://www.osti.gov/servlets/purl/862507.
@article{osti_862507,
title = {Method and means for generating a synchronizing pulse from a repetitive wave of varying frequency},
author = {DeVolpi, Alexander and Pecina, Ronald J and Travis, Dale J},
abstractNote = {An event that occurs repetitively at continuously changing frequencies can be used to generate a triggering pulse which is used to synchronize or control. The triggering pulse is generated at a predetermined percentage of the period of the repetitive waveform without regard to frequency. Counts are accumulated in two counters, the first counting during the "on" fraction of the period, and the second counting during the "off" fraction. The counts accumulated during each cycle are compared. On equality the trigger pulse is generated. Count input rates to each counter are determined by the ratio of the on-off fractions of the event waveform and the desired phase relationship. This invention is of particular utility in providing a trigger or synchronizing pulse during the open period of the shutter of a high-speed framing camera during its acceleration as well as its period of substantially constant speed.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Jan 01 00:00:00 EST 1976},
month = {Thu Jan 01 00:00:00 EST 1976}
}