Multiple channel coincidence detector and controller for microseismic data analysis

Patent · Mon Nov 15 23:00:00 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

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/327/324/
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