skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: 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:
 [1];  [2];  [3]
  1. Lisle, IL
  2. Westchester, IL
  3. Lockport, IL
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
OSTI Identifier:
862507
Patent Number(s):
US 3952253
Assignee:
United States of America as represented by United States Energy (Washington, DC)
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. 1976. "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 = {},
url = {https://www.osti.gov/biblio/862507}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1976},
month = {1}
}