Attenuation of axial vibration noise in pressure sensor measurements
AssigneePGS Geophysical AS
InventorStian Hegna
Life of this patent
Estimating the term…
Abstract
Methods and apparatus are described for reducing noise in measurements made by one or more pressure sensors disposed in a cable having a generally longitudinal axis. Estimated axial vibration noise at a location along the cable is determined based at least in part on measurements from one or more motion sensors disposed along the cable. The estimated axial vibration noise is subtracted from pressure sensor measurements corresponding to the location. The result is noise-attenuated pressure sensor measurements corresponding to the location.
Claims31
A method of generating reduced noise pressure sensor measurements from measurements made by one or more pressure sensors disposed in a cable having a generally longitudinal axis, comprising:
- determining estimated axial vibration noise at a location along the cable based at least in part on measurements from one or more motion sensors disposed in the cable;
- and
- subtracting the estimated axial vibration noise from pressure sensor measurements corresponding to the location, thereby generating the reduced noise pressure measurements;
- wherein the one or more motion sensors comprise at least one three-axis accelerometer that defines mutually orthogonal x, y and z accelerometer axes and that is configured to produce three orthogonal component measurements Ax, Ay and Az corresponding to the x, y, and z mutually orthogonal accelerometer axes, respectively;
- and
- wherein determining the estimated axial vibration noise comprises determining an axial acceleration component by applying a rotation transformation to the orthogonal component measurements Ax, Ay and Az of the at least one three-axis accelerometer.
A tangible, non-transitory, computer-readable medium containing instructions that, when executed by a computer system, cause the computer system to perform a method of generating reduced noise pressure sensor measurements from measurements made by one or more pressure sensors disposed in a cable having a generally longitudinal axis, the method comprising:
- determining estimated axial vibration noise at a location along the cable based at least in part on measurements from one or more motion sensors disposed in the cable;
- and
- subtracting the estimated axial vibration noise from pressure sensor measurements corresponding to the location, thereby generating the reduced noise pressure measurements;
- wherein the one or more motion sensors comprise at least one three-axis accelerometer that defines mutually orthogonal x, y and z accelerometer axes and that is configured to produce three orthogonal component measurements Ax, Ay and Az corresponding to the x, y, and z mutually orthogonal accelerometer axes, respectively;
- and
- wherein determining the estimated axial vibration noise comprises determining an axial acceleration component by applying a rotation transformation to the orthogonal component measurements Ax, Ay and Az of the at least one three-axis accelerometer.
A computer system configured to perform a method of generating reduced noise pressure sensor measurements from measurements made by one or more pressure sensors disposed in a cable having a generally longitudinal axis, the method comprising:
- determining estimated axial vibration noise at a location along the cable based at least in part on measurements from one or more motion sensors disposed in the cable;
- and
- subtracting the estimated axial vibration noise from pressure sensor measurements corresponding to the location, thereby generating the reduced noise pressure measurements;
- wherein the one or more motion sensors comprise at least one three-axis accelerometer that defines mutually orthogonal x, y and z accelerometer axes and that is configured to produce three orthogonal component measurements Ax, Ay and Az corresponding to the x, y, and z mutually orthogonal accelerometer axes, respectively;
- and
- wherein determining the estimated axial vibration noise comprises determining an axial acceleration component by applying a rotation transformation to the orthogonal component measurements Ax, Ay and Az of the at least one three-axis accelerometer.
Dependencies are inferred from the claim text.