Method for interpolating aliased seismic data to generate shot records at regular shot points. The method involves sorting the data into common offsets to obtain the finer sampling in the common-offset domain, then using DMO to transform the data to zero offset to eliminate azimuth and offset variations, from which densely sampled shot records are reconstructed by an efficient Log-Stretch Inverse Shot Record DMO. The method has ready application to techniques that benefit from input data that ar...

A method of implementing vibration suppression at equipment residing at a local site includes the steps of transmitting a prompt from a remote site to the local site, automatically sensing vibration response information from the equipment in response to the prompt, and transmitting the sensed vibration response information to the remote site. The method further includes the steps of analyzing the sensed vibration response information at the remote site and creating a vibration suppression algori...

Systems and methods for evaluating probe signal level readings in a manner that allows a low water detector to distinguish between a probe that is under a fluid level, or is above the fluid level and either being splashed or is within a foam. Low water detectors which utilize these systems and methods are also provided. The detectors generally utilize a representative probe reading, and a dynamic indicator between probe readings, for a set of probe readings taken in a time period to detect low w...

There is disclosed a wafer flatness evaluation method includes measuring front and rear surface shapes of a wafer. The wafer front surface measured is divided into sites. Then, a flatness calculating method is selected according to a position of the site to be evaluated and flatness in the wafer surface is acquired.

A method and apparatus for analyzing a hydraulic pump in real-time. A pressure signal is provided representing a discharge pressure of the hydraulic pump, and the pressure signal is decomposed into a plurality of levels. Each of the plurality of levels has at least one frequency band. A feature pressure signal is located in at least one of the frequency bands and compared to a reference wavelet to determine if a fault exists in the hydraulic pump and/or a type of defect in the hydraulic pump.

A system uses an event based equivalent time sampling method for ascertaining a value of each bit of a data frame repeated in a digital signal of indeterminate phase. The system measures time intervals between rising edges of the digital signal and a reference time and between falling edges of the digital and that reference time in response to pulses of a periodic arming signal. The measured time intervals are then normalized to equivalent time intervals and those intervals analyzed to determine...

A method for determining migration before summation including recording seismic reflection traces, for constituting a collection of traces to be migrated before summation and without weight correction. The traces being classified according to a given criterion and using a velocity model. The method including determining, for each point of interest M in a domain (X, Z), at least one line of slope determined on the basis of a line of slope map, in determining the specular rays associated with one ...

A seismic surveying method and system are disclosed. The method provides a remote display representative of the quality of the coverage of a seismic survey. The method includes progressively building up at the site of the survey a first data base of data required for said display and relating to the area being covered by the survey, concurrently transmitting the data being used to build up the first data base via satellite link to a first remote location, to build up a duplicate of the first dat...

A system and method is provided for optimizing production from a well. A plurality of sensors are positioned to sense a variety of production related parameters. The sensed parameters are applied to a wellbore model and validated. Discrepancies between calculated parameters in the wellbore model and results based on sensed parameters indicate potential problem areas detrimentally affecting production.

Method of determining the specular source/receiver pairs associated with seismic images produced from a transformation of multi-offset seismic wave records as a function of time in the depth domain.When using a prestack depth migration algorithm of Kirchhoff type, one also calculates and saves, in addition to the necessary traveltimes of the rays from the sources and receivers of the acquisition device to the image points of the image to be migrated, the line parameters of these rays and the des...