摘要:
The present invention relates to an optical filter having a waveguide structure constituted by a core region (12) in which a grating (16) for reflecting light of a predetermined wavelength is formed at a predetermined portion and a cladding region (14) which has a lower refractive index than the core region and covers the core region. In particular, this optical filter has a light-absorbing structure (140) for absorbing, of light to be reflected by the grating, a light component radiated from the grating to the cladding region. This light-absorbing structure is disposed, at least, at a region where the light component radiated from the grating to the cladding region reaches.
摘要:
The pulse laser light source apparatus in the OTDR apparatus of present invention comprises an optical waveguide which receives and guides the light emitted from the first light-emitting end face, wherein the optical waveguide comprises a reflecting area which selectively reflects a part of light emitted from a light-emitting end face of a semiconductor light-emitting device, a core of the reflecting area comprises a first diffraction grating which is disposed in a first area and whose refractive index periodically changes along an optical-axis direction, the first diffraction grating selectively reflects, of the light emitted from the light-emitting end face of the semiconductor light-emitting device, a part of the light within a first wavelength range. And the diffraction grating is one of denvices which constitute a laser resonator.
摘要:
Self-adjusting capacitive level switch for a non-contact or contact sensing of media or objects comprising a sensor (S6), on a dielectric body (db) of which between an opposite plate (op) and a plate (p) a screening plate (sp) is mounted. Starting from the plate (p) there are alternately mounted additional screening plates (sp1, ..., spn+1) connected through a resistor (r1) to the screening plate (sp) and additional plates (p1, ..., pn). Groups of additional plates (p1, ..., pn+1) are connected through resistors to the inverting input of an operational amplifier (1). At the beginning of each oscillation half-period the potential of the plates (p, p1, ..., pn) has a phase opposite to the phase of the screening plates (sp, sp1, ..., spn+1). The level switch detects electrically very poorly conductive materials with the relative permittivity near to 1 even through a thick, electrically well conductive deposit on its sensor.
摘要:
A satellite communication terminal system can execute voice communication even if it is placed at a location which is obstructed from a communication satellite by any object and has no telephone line. Further, a satellite communication terminal system for general purpose use and being extendible by using a satellite communication terminal comprises a portable satellite communication terminal for performing the voice communication with any other station through a communication satellite, a connection device and a radio telephone device including a base unit and hand units. The connection device comprises a terminal interface unit interfaced with the satellite communication terminal for controlling the transmission and reception of the satellite communication terminal and a channel control unit connected to the terminal interface unit for performing the channel connection to the radio telephone device. When the hand unit is placed at a location wherein the satellite communication terminal is not obstructed from the communication satellite, the voice communication with the other station can be accomplished through the satellite communication terminal at a location remote from the satellite communication terminal.
摘要:
The cutoff process of a collector current is divided into an emitter-to-collector voltage recovery period and a collector current cutoff period. During the emitter-to-collector voltage recovery period the resistance of a gate resistor is reduced, and during the collector current cutoff period the resistance of the gate resistor is increased. With this arrangement, the cutoff time is shortened, thereby reducing switching loss and suppressing surge voltage.
摘要:
A composition for electric material containing as a primary component zinc oxide. The composition further contains at least one of rare-earth elements in a range of 0.01 mol% to 3.0 mol% in terms of oxide thereof given by R 2 O 3 where R represents generally the rare-earth elements, and aluminum in a range of 0.0005 mol% to 0.005 mol% in terms of aluminum oxide given by Aℓ 2 O 3 . The composition is suited for manufacturing a resistance element whose varistor voltage can be increased over a whole current range without being accompanied with any appreciable degradation in flatness ratio of a voltage-versus-current characteristic.
摘要:
An optical module includes a photodiode disposed in front of a laser diode with an offset from an optical axis of the laser diode, for monitoring the power of an optical beam emitted from the laser diode in a forward direction. The optical module further achieves switching between a transmission mode and a reception mode in response to a drive current supplied to the laser diode.
摘要:
The apparatus for depositing thin films on both a first surface and a second surface of the substrate via off-axis laser ablation according to present invention comprises (1) a vacuum chamber (202), the vacuum chamber having (a) a first target (212a) of a first deposition material supported by a first target holder (214a), (b) a second target (212b) of a second deposition material supported by a second target holder (214b) so as to positioned to be substantially coplanar with the first target, (c) a substrate holder (210) for holding a substrate (208) above a space between the first and second targets, the substrate being oriented to be substantially perpendicular to the targets, (d) a heating means (216) for heating the first and second surfaces of the substrate, (e) a first entrance window (220a) through which a first laser beam passes to impinge onto the first target with a predetermined angle, and (f) a second entrance window (220b) through which a second laser beam passes to impinge onto the second target with a predetermined angle and (2) a laser optical system comprising at least one laser beam source (222) and an optical path system from said laser beam source to said targets, the optical path system including mirrors (224, 228) for reflecting the laser beams toward the targets through the first and second enctrance windows of the chamber.
摘要:
A surface heater is provided on the underside of an air mat having a bedsore preventing function whereby a patient is kept warm through an air layer in the air mat. A time delay caused by heating through the air layer is adjusted by predictor control.