Method and means for generating a synchronizing pulse from a repetitive wave of varying frequency

Patent · Thu Jan 01 00:00:00 EST 1976

OSTI ID:862507

DeVolpi, Alexander ^[1]; Pecina, Ronald J ^[2]; Travis, Dale J ^[3]

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1. Lisle, IL
2. Westchester, IL
3. Lockport, IL

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.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL (United States)
• DOE Contract Number: W-31109-ENG-38
• Assignee: United States of America as represented by United States Energy (Washington, DC)
• Patent Number(s): US 3952253
• OSTI ID: 862507
• Country of Publication: United States
• Language: English

Related Subjects

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/