Communications: electrical – Selective – Monitoring in addition to control
Patent
1976-12-06
1978-05-23
Birmiel, Howard A.
Communications: electrical
Selective
Monitoring in addition to control
181110, 340 7R, 114244, G01V 138
Patent
active
040913562
ABSTRACT:
A heave compensation system for an underwater towed seismic system of the kind in which a body containing a sound source and hydrophones is towed behind a ship, and a recording is made of echoes from the bottom and sub-bottom layers. An accelerometer in the towed body produces a signal indicative of the vertical acceleration of the body. The acceleration signal is double integrated within a frequency range having a low frequency roll-off to produce a position signal which is used to adjust the firing time of the source. If the fish heaves upwardly, the firing time is advanced; if the movement is downwards, the firing time is delayed. Preferably a pressure transducer in the fish produces a pressure signal which is also used to adjust the source firing time, for pressure variations below the lowest likely wave frequency. The crossover of the pressure and acceleration compensation systems is typically about 0.01 Hz.
Birmiel Howard A.
Hunter (70) Limited
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