Communications: electrical – Wellbore telemetering or control – Using a specific transmission medium
Patent
1995-06-08
1996-10-15
Lobo, Ian J.
Communications: electrical
Wellbore telemetering or control
Using a specific transmission medium
3408546, G01V 140
Patent
active
055658601
ABSTRACT:
In an underground information collecting apparatus which comprises a steel rod with an end to be inserted into the ground and which is for collecting on the ground underground information detected by a sensor mounted in the end, a noise receiving coil is provided to the rod in the vicinity of a main receiving coil which receives a magnetic signal transmitted from a transmitting coil through the rod and which produces a receiving signal. An amplitude and phase adjusting circuit adjusts a noise amplitude and a noise phase included in an induced noise signal obtained in the noise receiving coil to produce an adjusted noise signal having an adjusted noise amplitude and an adjusted noise phase. The adjusted noise amplitude and the adjusted noise phase are adjusted to be coincident with a noise amplitude and a noise phase contained in the receiving signal obtained in the main receiving coil, respectively. A differential circuit subtracts the adjusted noise signal from the receiving signal to cancel a noise component from the receiving signal.
REFERENCES:
patent: 5189415 (1993-02-01), Shimada et al.
Sakata Fumio
Yamazaki Nobuyoshi
Lobo Ian J.
Radic Co., Ltd.
Sakata Denki Co., Ltd.
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