OPTASENSE HOLDINGS LIMITED Patent applications |
Patent application number | Title | Published |
20140355383 | Location and Monitoring of Undersea Cables - The present application described methods an apparatus for locating and/or monitoring subsea cables ( | 12-04-2014 |
20140216151 | Flow Monitoring - This application describes methods and apparatus for monitoring flow of fluids within conduits using fibre optic Distributed Acoustic Sensing (DAS). The method can determine flow rate and/or flow regime within a conduit such as within a production well or a pipeline. Embodiments involve introducing an acoustic stimulus ( | 08-07-2014 |
20140208843 | Determining Perforation Orientation - A method and apparatus for determining the relative orientation of objects downwell, and especially to determining perforator orientation, involves varying the orientation of an object, such as a perforator gun ( | 07-31-2014 |
20140204368 | Fibre Optic Distributed Sensor - There is provided a distributed sensor, comprising a length of optic fibre; an interrogator unit having a detector arranged to detect light from the optic fibre, wherein the interrogator is arranged to provide distributed sensing on the optic fibre and wherein an optical path is defined between the optic fibre and the interrogator detector; a sampler coupled to the optic fibre and arranged to obtain a sample of light from the optical path of the optic fibre; a threshold detector arranged to detect the intensity of the sampled light and determine whether the intensity of the sampled light is above a threshold value; and an optical attenuator provided in the optical path and arranged to attenuate light propagating along the optical path when the intensity of the sampled light is above the threshold value. By attenuating light in the optical path if it is above a threshold value, the sensitive detector in the interrogator unit can be protected. | 07-24-2014 |
20140159715 | Portal Monitoring - The present invention relates to a portal monitoring system that uses distributed sensing to detect metallic objects passing through the portal. The system comprises a length of fibre optic ( | 06-12-2014 |
20140153364 | Seismic Geophysical Surveying - The present invention relates to an apparatus for use in geophysical surveying. Geophysical surveying typically involves stimulating an area of interest with a seismic source and detecting the response in a sensor array. The application describes a fibre optic distributed sensing apparatus having a source ( | 06-05-2014 |
20140123759 | Monitoring of Conduits - This application relates to methods and apparatus for monitoring of conduits, especially oil or gas pipelines, as an object such as pipeline pig moves within the conduit. The method comprises monitoring at least part of a conduit ( | 05-08-2014 |
20140069173 | Integrity Monitoring of Conduits - The present invention relates to a method of integrity monitoring of a conduit. An optic fibre is provided optic fibre along the path of the conduit, and a fluid in the conduit is pressurized and depressurized. The optic fibre is interrogated to provide a distributed acoustic sensor, and data is sampled from a plurality of longitudinal portions of the fibre during the pressurizing and depressurizing. The data is processed to detect a signal characteristic of the integrity of the conduit. | 03-13-2014 |
20140036628 | Subsurface Monitoring Using Distributed Acoustic Sensors - This application relates to methods and apparatus for geophysical monitoring within wellbores. The method involves interrogating an optical fibre ( | 02-06-2014 |
20130333474 | Conduit Monitoring - The present invention relates to a method of monitoring a fluid carrying conduit, comprising interrogating an optic fibre positioned along the path of said conduit to provide distributed acoustic sensing, measuring by distributed acoustic sensing the acoustic signal at each of a plurality of discrete longitudinal sensing portions along the length of the optic fibre, to monitor the optic fibre for the presence of a first characteristic signal, the first characteristic signal being indicative of ground heave the vicinity of the optic fibre, and determining that a failure has occurred in said conduit when a first characteristic signal is measured in the distributed acoustic sensing. | 12-19-2013 |
20130319121 | Distributed Acoustic Sensing - This application describes methods and apparatus for distributed acoustic sensing providing enhanced sensitivity for certain acoustic signals. The method uses a fibre optic distributed acoustic sensing (DAS) apparatus ( | 12-05-2013 |
20130298635 | Techniques for Distributed Acoustic Sensing - The application describes techniques for monitoring the rate of flow of fluid in a conduit ( | 11-14-2013 |
20130291642 | Fibre Optic Distributed Sensing - This application describes methods and apparatus for fibre optic distributed acoustic sensing (DAS) where microstructured fibre ( | 11-07-2013 |
20130242698 | Seismic Surveying Using Fiber Optic Technology - This application relates to methods and apparatus for seismic surveying using optical fibre distributed acoustic sensing (DAS). The method involves using a fibre optic distributed acoustic sensor to detect seismic signals. The fibre optic distributed acoustic sensor comprises an interrogator ( | 09-19-2013 |
20130233537 | Fracture Characterisation - This application relates to methods and apparatus for monitoring hydraulic fracturing in well formation and fracture characterisation using distributed acoustic sensing (DAS). The method involves interrogating a optic fibre ( | 09-12-2013 |
20130154632 | Magnetic Field Detector - There is provided a system ( | 06-20-2013 |
20130151203 | Detection of Moving Objects - A system for moving object ( | 06-13-2013 |
20130139600 | Gunfire Detection - An apparatus and method for detecting gunfire is provided which uses distributed acoustic sensing to provide the gunfire detection. The method comprises interrogating an optical fibre with electromagnetic radiation to provide a distributed acoustic sensor comprising a plurality of sensing portions of the optical fibre, and analysing a measurement signal from said sensing portions to detect gunfire events. A gunfire event will typically be relatively intense but of short duration and affect multiple sensing channels. The method may detect a characteristic | 06-06-2013 |
20120230629 | Fibre Optic Distributed Sensing - A method of distributed fibre optic sensing is described in which an optical fibre ( | 09-13-2012 |
20120230628 | Distributed Fibre Optic Sensing - The invention relates to a distributed fibre optic sensor ( | 09-13-2012 |
20120226452 | Improvements in Distributed Fibre Optic Sensing - Techniques for determining lateral offset of the source of an acoustic disturbance in a distributed acoustic fibre optic sensor are described. The sensor comprises an optical source ( | 09-06-2012 |
20120222487 | OPTIC FIBRES AND FIBRE OPTIC SENSING - Fibre optic cables with improved performance for use in distributed sensing, for instance in distributed acoustic sensors, are disclosed. In one embodiment a fibre optic cable ( | 09-06-2012 |