Abstract: Various embodiments include apparatus and methods to measure a parameter of interest using a fiber optic cable. The parameters can be provided by a process that provides for multiplexed or distributed measurements. A multiplexed or a distributed architecture can include acoustic sensor units placed selectively along an optical fiber such that the acoustic sensor units effectively modulate the optical fiber with information regarding a parameter to provide the information to an interrogator coupled to the optical fiber that is separate from the acoustic sensor units.

Abstract: Reducing disturbance during fiber optic sensing. An in-well fiber optic sensing system includes a device insulated to be disturbance-resistant. The device is in a fiber optic communication path between a source and a target configured to be received in a well. The device is configured to receive a parameter sensing signal transmitted from the source to the target and produce a reference signal. The fiber optic sensing system includes a signal interrogation system connected to the device in the fiber optic communication path. The signal interrogation system is configured to receive the reference signal from the device and to receive a response signal from the target in response to the parameter sensing signal. The response signal represents the parameter of interest. The signal interrogation system is configured to determine the parameter of interest based, in part, on the reference signal and the response signal.

Abstract: Various embodiments include systems and methods to communicate along pipes using a conductive waveguide at quasioptical frequencies. The communication can be conducted as propagation to and from a tool at the quasioptical frequencies. A communication architecture may include a transmitter and receiver at one end of the conductive waveguide and a modulation device at an opposite end of the conductive waveguide. Additional systems and methods are disclosed.

Abstract: Reducing disturbance during fiber optic sensing. An in-well fiber optic sensing system includes a device insulated to be disturbance-resistant. The device is in a fiber optic communication path between a source and a target configured to be received in a well. The device is configured to receive a parameter sensing signal transmitted from the source to the target and produce a reference signal. The fiber optic sensing system includes a signal interrogation system connected to the device in the fiber optic communication path. The signal interrogation system is configured to receive the reference signal from the device and to receive a response signal from the target in response to the parameter sensing signal. The response signal represents the parameter of interest. The signal interrogation system is configured to determine the parameter of interest based, in part, on the reference signal and the response signal.

Abstract: Mitigating back reflection in fiber optic cables when coupling two fiber optic cables, for example, for implementing in harsh environments including wellbores. As described below, light from a source can travel toward a target through a first fiber optic cable and a second fiber optic cable coupled to the first fiber optic cable using a coupling system. The two fiber optic cables can be coupled such that all or a portion of back reflection at the coupling part is absorbed rather than permitted to travel back toward the source through the first fiber optic cable.

Abstract: An indentation hardness test system includes a frame including an attached indenter, a movable stage for receiving a part attached to the frame, a camera, a display, a processor and a memory subsystem. The camera captures images of the part, which can then be provided on the display. The processor is coupled to the movable stage, the camera and the display, as well as the memory subsystem. The memory subsystem stores executable code that instructs the processor to capture a series of real-time images of the part using the camera, obtain associated stage coordinates for each of the images and display a composite image, which includes the series of real-time images assembled according to the associated stage coordinates, of the part.

Abstract: An indentation hardness test system includes a frame having a movable turret, a movable stage for receiving a part, a camera, a display, a processor and a memory subsystem. The turret includes an objective lens of a microscope and an indenter and the movable stage is configured for receiving the part to be tested. The camera captures images of the part through the microscope, which can then be provided on the display. The processor is coupled to the turret, the movable stage, the camera and the display, as well as the memory subsystem. The memory subsystem stores executable code that instructs the processor to capture and store a series of real-time images of the part using the camera, store associated stage coordinates provided by the stage for the images and display a composite image, which includes the series of real-time images assembled according to the associated stage coordinates, of the part.

Abstract: An indentation hardness test system includes a frame having a movable turret, a movable stage for receiving a part, a camera, a display, a processor and a memory subsystem. The turret includes an objective lens of a microscope and an indenter and the movable stage is configured for receiving the part to be tested. The camera captures images of the part through the microscope, which can then be provided on the display. The processor is coupled to the turret, the movable stage, the camera and the display, as well as the memory subsystem. The memory subsystem stores executable code that instructs the processor to capture and store a series of real-time images of the part using the camera, store associated stage coordinates provided by the stage for the images and display a composite image, which includes the series of real-time images assembled according to the associated stage coordinates, of the part.