G - Physics – 01 – V
Patent
G - Physics
01
V
349/10
G01V 1/22 (2006.01) G01V 1/38 (2006.01) H03H 19/00 (2006.01) H04L 25/49 (2006.01)
Patent
CA 1041208
SEISNIC DATA TELEMETERING SYSTEM A B S T R A C T A plurality of data acquisition and transceiver units are connected in series to a central signal processor through a common telemeter link. The telemeter link includes a data channel, an in- terrogation channel and a control channel. The signal propagation velocity through the control channel may, for example, be greater than the signal propagation velocity through the interrogation chan- nel. The central signal processor sends an interrogation signal through the interrogation channel to the data acquisition units. After a selected delay, a control pulse is transmitted. The delay between transmissions of the two signals is proportional to the differential travel time of the signals in the two channels. Accordingly the sig- nal through the control channel will overtake and intercept the signal propagating through the interrogation channel, at a selected data ac- quisition unit. When any selected data acquisition unit receives a control signal through the control channel at the same time that it receives an interrogation signal through the interrogation channel, that unit is activated and a desired function is performed. The con- trol signal is a square wave pulse having a width which is adjustable by integral multiples of the differential travel time. By adjusting the width and transmission-time delay of the control pulse, any selected subset of one or more consecutive units may be activated. Each data acquisition unit may have two or more input channels, which are con- nected in turn through common electronics to the data transmission channel by means of a channel selector or multiplexer. The interro- gation signal may exist in one of two or more states. In the first state, in combination with a control pulse, the interrogation signal resets the multiplexer. In the second state, the inter- rogation signal advances the multiplexer to the next input chan- nel in sequence.
252004
Morgan Paul M.
Siems Lee E.
LandOfFree
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