Abstract:
This invention provides a method for controlling production operations using fiber optic devices. An optical fiber carrying fiber-optic sensors is deployed downhole to provide information about downhole conditions. Parameters related to the chemicals being used for surface treatments are measured in real time and on-line, and these measured parameters are used to control the dosage of chemicals into the surface treatment system. The information is also used to control downhole devices that may be a packer, choke, sliding sleeve, perforating device, flow control valve, completion device, an anchor or any other device. Provision is also made for control of secondary recovery operations online using the downhole sensors to monitor the reservoir conditions. The present invention also provides a method of generating motive power in a wellbore utilizing optical energy. This can be done directly or indirectly, e.g., by first producing electrical energy that is then converted to another form of energy.
Abstract:
The present invention features a packaging system for two-dimensional optoelectronic arrays. In one embodiment, the packaging includes a heat spreader, a housing with embedded electrical interconnections, a substrate including electrical contacts, an application specific integrated circuit (ASIC) including a hybridized array with vertical cavity surface emitting laser (VCSEL), detectors or both. The waveguide assembly includes a plurality of individual one-dimensional waveguides formed in waveguide sheets, wherein the waveguides match the array footprint on one end and a connector footprint on the other end.
Abstract:
The present invention relates to an electro-optic probe, which includes the following components: a laser diode for emitting a modulating laser light according to control signals generated in a main body of the electro-optic sampling oscilloscope; a first lens for converting the modulating laser light to a parallel beam; a second lens for focusing the parallel beam; an opto-electronic element having a reflection film at a reflection-end; an isolator device disposed between the first lens and the second lens for transmitting the modulating laser light and separating a reflected beam produced at the reflection film into signal beams; and photo-diodes for converting optical energies of the signal beams separated by the isolator device into respective electrical signals; wherein, the signal beams to enter the photo-diodes are directed to propagate towards the laser diode, and the photo-diodes are disposed in a longitudinal direction of a probe casing.
Abstract:
An optical probe, which is particularly suited to for use in measurements on tissue material of a patient. In one embodiment, the probe comprises upper and lower housing elements incorporating a light energy source and corresponding detector. The tissue material of the patient is disposed between the upper and lower housing elements such that the light energy emitted by the source passes through the tissue material to the detector. A plurality of light shields are attached to one or both of the housing elements to reduce the amount of ambient and reflected light reaching the detector. Additionally, various portions of the upper and lower housing elements and shields utilize light absorbent coloration and/or coatings which further mitigate the effects of undesired ambient and reflected light, thereby reducing noise generated within the instrument and increasing its accuracy. In one embodiment, the light shields are made removable from the optical probe, thereby facilitating replacement. A circuit for monitoring the condition of the probe, and indicating when replacement of the probe is desirable, is also disclosed.
Abstract:
An apparatus for applying an optical signal to a surface and collecting the light leaving the surface in response to the application of the optical signal. The optical signal and the collected light traverse an optical fiber having an end proximate to the surface which delivers light to the surface with the aid of a lens that couples the optical signal to the surface, collects the light emitted by the surface, and couples collected light into the optical fiber. A detector measures the intensity of light delivered into the optical fiber and generates a detection signal indicative of the measured intensity as a function of time. A set of actuators dither the position of the lens relative to the proximate end of the fiber. Each actuator operates at a different dither frequency and moves the lens relative to fiber along a different axis. The average position of the lens relative to the proximate end of the fiber along each axis is adjusted so as to maximize the average power detected at the corresponding dither frequency.