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US 6,725,164 B1Granted
Hydrophone assembly
AssigneeInput/Output, Inc.
InventorEugene D. Bednar
Life of this patent
Estimating the term…
Abstract
A hydrophone assembly is provided that has a frequency response that matches that of an accelerometer. In a preferred implementation, the frequency response resembles that of a differentiator in combination with a pair of simple lags.
Claims17
An apparatus for measuring response to seismic waves, comprising:
- a hydrophone assembly, the hydrophone assembly further including:
- a hydrophone;
- and
- a hydrophone filter coupled to the hydrophone to closely match a frequency response of the hydrophone assembly to a frequency response of an accelerometer, wherein the frequency response of the hydrophone assembly includes a first cut-off frequency and a second cut-off frequency and wherein the hydrophone assembly frequency response has a positive slope below the first cut-off frequency and a negative slope above second cut-off frequency.
1 more element
A marine seismic acquisition system, comprising:
- a seismic source for generating seismic energy;
- a hydrophone for detecting seismic energy;
- an accelerometer for detecting seismic energy;
- a hydrophone filter coupled to the hydrophone forming a hydrophone assembly,
- wherein a frequency response of the combination of the hydrophone and
- hydrophone filter closely matches a frequency response of the accelerometer and wherein the hydrophone assembly frequency response has a positive slope below a first cut-off frequency and a negative slope above a second cut-off frequency;
- a seismic recorder for recording an output of the accelerometer and an output of the hydrophone assembly;
- and
- a controller coupled to the seismic source and seismic recorder for controlling
- and monitoring the operation of the seismic source and seismic recorder.
7 more elements
A method for measuring response to seismic waves, comprising:
- measuring the seismic waves using a hydrophone assembly, the hydrophone assembly further including a hydrophone and a hydrophone filter coupled to the hydrophone;
- and
- closely matching a frequency response of the hydrophone assembly to a frequency response of an accelerometer using the hydrophone filter, wherein the hydrophone assembly frequency response has a positive slope below a first cut-off frequency and a negative slope above the second cut-off frequency.
Dependencies are inferred from the claim text.