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[en] Full text: We present a simple shot-noise limited fiber interferometer that is used for the characterization of micrometer-sized mechanical resonators.We discuss its potential both for applications and for new quantum experiments involving fiber-based optomechanical systems. (author)
[en] This patent describes a nuclear radiation detector system. It comprises: a first set of optical fibers; a second set of optical fibers; a first predetermined section of each of the fibers in the first set arranged side by side in a common plane to form a first linear array; a first predetermined section of each of the fibers in the second set arranged side by side in a common plane to form a second linear array. The first and second linear arrays being arranged orthogonally to define a matrix of rows and columns of fibers for sensing the presence of a nuclear particle and converting the nuclear radiation energy thereof to optical energy; a second predetermined section of each of the fibers in the first set arranged in a bundle to form a first planar array; a second predetermined section of each of the fibers in the second set arranged in a bundle to form a second planar array; and detector means coupled to the first and second planar arrays for measuring the optical energy output thereof to determine the location of the sensed nuclear particle
[en] A critical capability of the new RHIC low level rf (LLRF) system is the ability to synchronize signals across multiple locations. The 'Update Link' provides this functionality. The 'Update Link' is a deterministic serial data link based on the Xilinx RocketIO protocol that is broadcast over fiber optic cable at 1 gigabit per second (Gbps). The link provides timing events and data packets as well as time stamp information for synchronizing diagnostic data from multiple sources. The new RHIC LLRF was designed to be a flexible, modular system. The system is constructed of numerous independent RF Controller chassis. To provide synchronization among all of these chassis, the Update Link system was designed. The Update Link system provides a low latency, deterministic data path to broadcast information to all receivers in the system. The Update Link system is based on a central hub, the Update Link Master (ULM), which generates the data stream that is distributed via fiber optic links. Downstream chassis have non-deterministic connections back to the ULM that allow any chassis to provide data that is broadcast globally.
[en] The probes of fiber optic OTDR (Optical Time Domain Reflectometry) sensor was developed to measure displacements of social infrastructures. This probe was simply constructed with two conventional optical fiber connectors, and a fiber bending part, which transforms displacement to optical loss. When the displacement was affected on the bending loss part, the reflected light intensity of one optical connector was changed. The displacement was determined from this reflected light intensity change of the connector. Fiber optic OTDR displacement sensor was developed as the multiplexed type of one fiber line with 5 sensor probes. Multiplexing operation was tested by these 5 sensor probes
[en] A brief review is presented of the state of the art of fibre optic communication based on materials of the conferences held in 1999. The main attention is paid to fibre optic systems with the spectral multiplexing of channels and the bit rate of ∼Tbit s-1. (invited paper)
[en] In this section, the author describes how fiber optics can be used as active transmitters of diagnostic data and some ways in which they can be used as passive radiation-to-light converters. The author also discusses the problems of radiation damage and temporal dispersion which are encountered in using fiber optics to transmit diagnostic data and some of the techniques used to mitigate these problems
[en] A detection technique is studied to determine the location and the weight of an intruder into infrastructure using fiber optic ROTDR (Rayleigh optical time domain reflectometry) sensor. Fiber optic sensing plates buried in sand are prepared to measure the intruder effects. The signal of ROTDR was analyzed to confirm the detection performance. The constructed ROTDR system could be used up to 12km at the pulse width of 30ns. The location error was less than 3m and the weight could be detected into three levels of grade, such as 20kgf, 40kgf and 60kgf
[en] The most important waveguide structures in proton-exchanged lithium niobate for different modulators used in modern integrated and fiber optics devices (navigation equipment, temperature sensors, electric field sensors, etc.)are described. An emphasis is put on optical gyroscopes and sensing elements based on integrated optical phase and amplitude modulators.
[en] An automatic control system for a high-voltage electrostatic accelerator with an accelerating potential of up to 500 kV is described. The electronic apparatus on the high-voltage platform is controlled and monitored by means of a fiber-optic data-exchange system. The system is based on CAMAC modules that are controlled by a microprocessor crate controller. Data on accelerator operation are represented and control instructions are issued by means of an alphanumeric terminal. 8 refs., 6 figs