Abstract:
An apparatus for detecting foreign bodies in fiber material includes at least two light sources. At least one of the light sources has at least three light emitting elements. Each light emitting element radiates a light of different color. An arrangement directs the light emitted by the light sources to the fiber material for illuminating the fiber material, and a sensor detects the illuminating light after illumination of the fiber material for emitting an electric signal upon a sudden color change of the fiber material. An arrangement causes the light sources to alternatingly illuminate the fiber material with different colors, and further, an arrangement selects the color emitted by the light sources as a function of the color of the fiber material.
Abstract:
An optical amplification apparatus has a first optical amplification unit and a second optical amplification unit connected in tandem with an optical attenuator between them. A temperature sensor is located in the vicinity of an optical fiber included in the second optical amplification unit. A reference voltage generation circuit controls an automatic gain control (AGC) circuit according to an output signal of the temperature sensor Alight signal detector detects maximum or minimum power from among the powers of the wavelength components output from the second optical amplification unit. The AGC adjusts the pumping power to set maximum/minimum to a predetermined value.
Abstract:
A method and apparatus for shutting off a source of optical power to an optical fiber in the event of a cut in the fiber are disclosed. Embodiments of the invention are particularly suited in fiber optic communications systems that use Raman pumps for signal amplification. Optical power from the pump to a fiber is shut off in response to a change in a supervisor signal provided to a first end of the fiber. The supervisor signal is generally operated in an “always-on” mode to provide for fail-safe operation. The apparatus generally comprises a controller coupled to the source of optical power and means for coupling a supervisor signal, which has been provided to a first end of the fiber, to the controller. The method and/or apparatus may be incorporated into an optical communications system having an optical fiber and two or more hubs coupled to the fiber.
Abstract:
A fiber optic cable, signal-receiving system 10 is disclosed. The system 10 includes an exposed signal receiver 28, 80 for receipt of remote-control signals from a remote-control transmitter. In a first embodiment, the signal receiver comprises a signal refractor 28 that bends the remote-control signals toward a collector 58 hidden within the headrail housing 18. In an alternative embodiment, the signal receiver comprises a remote eye 80 that positions the collector 58 for direct receipt of the remote-control signals. The signal refractor 28 or the remote eye 80 is mounted adjacent to a lowest edge of a headrail, valance, or over treatment for a window covering. The remote-control transmitting device thus generates signals that impinge upon the collector 58 of the remote eye 80 or upon the signal refractor 28, and which are subsequently transmitted via fiber optic cable 90 to receiver electronics 66 hidden within the headrail housing 18 for further processing and interpretation. The signal-receiving system 10 of the present invention permits the bulk of the system components, including, for example, the receiver electronics 66, to be hidden. The relatively small signal receiver 28, 80 of the system 10 is the only clearly visible component from exteriorly of the headrail.
Abstract:
On a module substrate on which a wiring pattern is formed, an integrated circuit device is mounted via solder bumps so that the front surface thereof faces the module substrate. An optical fiber is seated within a groove formed on the rear surface of the integrated circuit device. Additionally, a photo-detecting device is mounted on the module substrate for receiving light transmitted through the optical fiber. This allows the photo-detecting module to reduce the number of mounted parts and to be fabricated in less time.
Abstract:
Disclosed are flow separation detectors and, more particularly feedback sensor arrangements adapted to provide for the measurement of surface aerodynamic flow phenomena, and especially with regard to aerodynamic flow separation which is encountered over a surface. In order to obviate or ameliorate the electrical energy requirements in the provision of feedback sensor arrangements, particularly such which are employed for a closed-loop control of aerodynamic flow separation; for instance, that on the wing of an aircraft wherein there can be encountered a breakdown of a boundary-layer flow which may adversely affect the performance of the aircraft, provided is a novel system of flow separation sensors which are based on fiber optics and which may be employed for separation feedback control. In particular, the sensors which are based on fiber optics may employ an optical tuft arrangement based on the thermal/fluidic principles of the electrical thermal tuft, but with the employing of fiber optics signal and energy transmission instead of electronics. To that effect, the light transmitted through the fiber optics is adapted to be converted into heat enabling a packet of heated fluid to be convected in the direction of a predominant aerodynamic flow, and to impact or contact one of the temperature sensors which are based on fiber optics at a small following time interval, so as to provide the required information concerning aerodynamic flow separation.
Abstract:
A device for directing a defined light beam onto a photosensitive area, for testing the performance of a photovoltaic module including said photosensitive area, comprising a support structure (1) which can be turned about a vertical central axis (4) in accordance with the actual azimuthal sun position. Housing (7) receives the photovoltaic module with the photosensitive area (6) of said module in a horizontal position, the housing being located in the lower portion of the support structure. A first mirror (2) which can be tilted about a horizontal axis (3) in order adapt its position continuously to the sun elevation position and to optimize the sun light impact thereon, and a second mirror (5) is fixed to the support structure (1) vertically above the photosensitive area (6) of the module and receives the light beam from the first mirror (2) for reflexion towards said area (6). At least one of said mirrors (2, 5) being associated to a mechanism (8) which allows one to vary the convexity of the mirror in accordance with sun intensity detectors.