Communications – electrical: acoustic wave systems and devices – Testing – monitoring – or calibrating
Patent
1979-03-07
1981-06-30
Moskowitz, Nelson
Communications, electrical: acoustic wave systems and devices
Testing, monitoring, or calibrating
324 51, 364482, 73100DV, G01V 116, G01C 2700
Patent
active
042766192
ABSTRACT:
This relates to testing the impedance and common mode rejection characteristics of multi-channel seismic data gathering apparatuses. The apparatus embodying the invention includes a signal recording and computing system with a plurality of input channels; a plurality of geophone channels, each with a high wire and a low wire; a high bus and a low bus; a plurality of reference impedances; and a signal generator with two output terminals. Each geophone channel comprises one or more geophones which are connected by the wires to the input channels of the recording and computing system. Additionally, the high wire of each channel is connected through a reference impedance to the high bus and the low wire of each channel is connected through a reference impedance to the low bus. The apparatus also includes switching means for selectively controlling the connections between the buses, the generator and ground. For gathering seismic data, a first setting of the switching means connects both buses to ground and disconnects both buses from the generator. A second setting for testing the impedances of the geophone channels disconnects the buses from ground and connects them to the generator so that a known test signal is applied to the geophone channels simultaneously and the voltage developed across the wires of each channel is measured and used as a basis for computing the impedance of each channel. A third setting for measuring the common mode rejection of each channel disconnects both buses from ground and connects them to one of the terminals of the generator and connects the other terminal of the generator to ground. The voltage developed across each pair of wires under these conditions is a measure of the common mode rejection of the geophone channels.
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Exxon Production Research Company
Glober, Jr. George E.
Moskowitz Nelson
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