Abstract: An outdoor tool and a lubrication system for an outdoor tool are provided. The lubrication system includes a reservoir, a pump, and an output configured to deliver lubricant to a tool unit of the outdoor tool. The pump is adjustable between a plurality of flow rate settings. The lubrication system may include one or more anti-leak mechanisms. The lubrication system may include a dedicated pump motor distinct from a motor assembly of the tool. A display system to display operating parameters of the lubrication system may be included.

Abstract: To measure a characteristic of a multimode optical fiber, a light pulse source produces a light pulse for transmission into the multimode optical fiber. A spatial filter passes a portion of Brillouin backscattered light from the multimode optical fiber that is responsive to the light pulse. Optical detection equipment detects the portion of the Brillouin backscattered light passed by the spatial filter.

Abstract: An optical time domain reflectometry (OTDR) system is configured to detect Rayleigh backscatter reflected from a multimode sensing optical fiber. The system includes a single spatial mode filtering system to select a single speckle of the Rayleigh backscatter produced in response to an optical pulse launched into the multimode fiber. The detected single speckle may be used for distributed disturbance (vibration) detection.

Abstract: An optical time domain reflectometry (OTDR) system is configured to detect Rayleigh backscatter reflected from a multimode sensing optical fiber. The system includes a single spatial mode filtering system to select a single speckle of the Rayleigh backscatter produced in response to an optical pulse launched into the multimode fiber. The detected single speckle may be used for distributed disturbance (vibration) detection.

Abstract: To measure a characteristic of a multimode optical fiber, a light pulse source produces a light pulse for transmission into the multimode optical fiber. A spatial filter passes a portion of Brillouin backscattered light from the multimode optical fiber that is responsive to the light pulse. Optical detection equipment detects the portion of the Brillouin backscattered light passed by the spatial filter.

Abstract: A logging method for measuring the resistivity of formations having a borehole passing therethrough, in which a logging sonde is suspended inside the borehole by means of a cable, the sonde comprising electrodes for injecting alternating currents into the formations, these electrodes comprising a central electrode A.sub.0 and focusing electrodes, together with a return electrode B and a potential reference electrode N, one of which is placed above the sonde and the other of which is placed at the surface, and producing a resistivity log from the current I.sub.0 emitted by the central electrode and the potential difference between the sonde and the reference electrode. The method further comprises the step of producing a second log of the resistivity with the return and potential reference electrodes being placed as for the first log and under conditions such that the investigation depth is different from that applicable to the first log. The invention is applicable to correcting the Groningen effect.

Abstract: Systems, for investigating casings which are fitted into boreholes that traverse earth formations and which are suitable for use in evaluating and/or optimizing the cathodic protection of casings and for finding the location and rate of casing corrosion, generally includes a downhole tool capable of investigating the casing along a measurement control unit located around the surface of the earth formation, and a cable having one end connected to the downhole tool and the other connected to the measurement control unit, with the cable including at least a plurality of first connection lines. The tool invention generally includes at least a first pair of longitudinally spaced electrodes, at least a pair of second connection lines, each of the second connection lines having one end connected to a corresponding one of the electrodes, and relays interposed between the first connection lines and the second connection lines.