Multiple channel coincidence detector and controller for microseismic data analysis

Patent · Tue Nov 16 00:00:00 EST 1976

OSTI ID:862702

Fasching, George E ^[1]

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1. Morgantown, WV

A multiple channel coincidence detector circuit is provided for analyzing data either in real time or recorded data on a magnetic tape during an experiment for determining location and progression of fractures in an oil field or the like while water is being injected at high pressure in wells located in the field. The circuit is based upon the utilization of a set of parity generator trees combined with monostable multivibrators to detect the occurrence of two events at any pair of channel input terminals that are within a preselected time frame and have an amplitude above a preselected magnitude. The parity generators perform an exclusive OR function in a timing circuit composed of monostable multivibrators that serve to yield an output when two events are present in the preselected time frame. Any coincidences falling outside this time frame are considered either noise or not otherwise useful in the analysis of the recorded data. Input pulses of absolute magnitude below the low-level threshold setting of a bipolar low-level threshold detector are unwanted and therefore rejected. A control output is provided for a utilization device from a coincidence hold circuit that may be used to halt a tape search unit at the time of coincidence or perform other useful control functions.

• Research Organization: MERC
• Assignee: United States of America as represented by United States Energy (Washington, DC)
• Patent Number(s): US 3992672
• Application Number: 05/620,460
• OSTI ID: 862702
• Country of Publication: United States
• Language: English

Related Subjects

multiple
channel
coincidence
detector
controller
microseismic
data
analysis
circuit
provided
analyzing
time
recorded
magnetic
tape
experiment
determining
location
progression
fractures
oil
field
water
injected
pressure
located
based
utilization
set
parity
generator
trees
combined
monostable
multivibrators
detect
occurrence
events
pair
input
terminals
preselected
frame
amplitude
magnitude
generators
perform
exclusive
function
timing
composed
serve
yield
output
coincidences
falling
outside
considered
noise
otherwise
useful
pulses
absolute
below
low-level
threshold
setting
bipolar
unwanted
rejected
control
device
hold
halt
unit
functions
seismic data
oil field
input terminal
input terminals
data analysis
selected time
detector circuit
multiple channel
input pulse
timing circuit
time frame
hold circuit
utilization device
preselected magnitude
control functions
control function
input pulses
preselected time
magnetic tape
channel coincidence
coincidence detector
determining location
threshold detector
monostable multivibrator
level threshold
analyzing data
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