Simplified roll along switching
AssigneeThe Anaconda Company
InventorKamal A. Mahmood
Life of this patent
Estimating the term…
Abstract
A seismic prospecting roll along switch incorporating electronically controlled switches in an improved switch arrangement requiring far fewer switches than previous systems. In a simple form, one switch is provided for each geophone input with one contact of each switch connected to one of the inputs and the other contact of each switch connected in pairs, appropriately selected, to the inputs of amplifier and filter channels. A controller is provided for electronically closing the appropriate switches for each roll along position. In most roll along positions geophone inputs are connected out of order to the signal processing channels and the sequence is corrected by a modified multiplexer which connects the processing channels to a system analog to digital converter.
Claims9
In a roll along geophysical prospecting system of the type having "m" geophone inputs, a smaller number "n" signal processing channels and switching network, the improvement comprising a simplified for coupling selected sets of "n" of said "m" geophone inputs to said "n" signal processing channels, at least one of said selected sets being connected in out of serial order to said processing channels, said switching network having "m" switches each having a first contact connected to an input of one of said "n" signal processing channels.
In a geophysical prospecting system of the type having inputs 1 through "m" for connection to a spread of "m" geophones positioned on the earth's surface in preselected order, signal processing channels 1 through "n", where "n" is smaller than "m", and switching means for connecting a sequential set of up to "n" of said "m" inputs to said "n" processing channels, improved switching means comprising:
- switches 1 through "m" each having a first contact connected to the inputs 1 through "m" respectively and each having a second contact connected to inputs of said processing channels 1 through "n" in a repeated sequential order such that second contacts of switches 1 through "n" are connected to inputs of processing channels 1 through "n" respectively, second contacts of switches "n"+1 through "2n" are connected to inputs of processing channels 1 through "n" respectively, and so on, and control means for selectively closing a plurality of said switches within a preselected sequential set "n" of said switches 1 through "m".
In seismic roll along prospecting, a method for coupling preselected sets of signals from "m" geophone inputs to a smaller set of "n" processing channels, at least one of said preselected sets of signals coupled in out of serial order to said processing channels, said method comprising:
- connecting geophone inputs "1" through "m" to first contacts of "m" switches,
- connecting second contacts of said "m" switches to inputs of processing channels "1" through "n" in a repeated sequential order, and
- selectively closing a plurality of switches within a preselected sequential set "n" of said switches "1" through "m."
Dependencies are inferred from the claim text.