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| Number | Title | Issue Date |
| 5850140 | Electric field sensor having sensor head with unbalanced electric field shield to shield branched optical waveguides against an applied electric field An electric field sensor comprises a substrate 4, an incident optical waveguide 5 formed on the substrate 4, two branched optical waveguides 6 formed on the substrate 4 to be branched from the incident optical waveguide 5 and having refractive indexes, wh... | 12/15/1998 |
| 5847560 | Process and device for measuring an alternating electric current with temperature compensation Linearly polarized measuring light is broken down into two differently polarized component light signals in an analyzer after passing through a Faraday sensor device. The intensity of the corresponding electric intensity signals is normalized by dividing ... | 12/08/1998 |
| 5844410 | Device for optically measuring physical quantity in power equipment and method of manufacturing the same A device for optically measuring a physical quantity in power equipment includes an optical fiber associated with the power equipment, an optical part for transmitting/receiving light to/from the optical fiber, calculation unit for calculating a physical ... | 12/01/1998 |
| 5844409 | Method and system for measuring an electric current with two light signals propagating in opposite directions, using the Faraday effect Method and system for measuring an electric current in a current conductor, two opposing light signals are transmitted through a Faraday element surrounding the current conductor and, after the passage through the Faraday element, are split, respectively,... | 12/01/1998 |
| 5844288 | Photoconductive element and method for measuring high frequency signals A photoconductive method or apparatus for measuring high frequency signals using a relatively inexpensive photoconductive material with a relatively long duration or recombination time. The photoconductive method or apparatus utilizes a photoconductive el... | 12/01/1998 |
| 5834933 | Method for magnetooptic current measurement and magnetooptic current-measuring device Simple methods for magnetooptic current measurement and magnetooptic current-measuring devices are specified, which are independent of temperature influences on the measurement result and require no compensation device for the light intensity of light sou... | 11/10/1998 |
| 5825174 | Temperature responsive battery tester A device for measuring the voltage of a voltage source includes a number of temperature responsive displays and a circuit including a number of heating circuits, each heating circuit for heating one of the temperature responsive displays when a threshold ... | 10/20/1998 |
| 5818216 | Minimally invasive current sensing circuit A minimally invasive detection circuit for determining whether a current flow is present in an electrical conductor, such as a telephone line, without appreciably loading the conductor. A load is placed in series with the conductor to generate a voltage d... | 10/06/1998 |
| 5811964 | Method and device for measuring an electrical alternating quanity with temperature compensation A polarized measuring light is provided to a sensing means under the influence of an alternating electrical quantity, the polarization of the measuring light changing as a function of the alternating electrical quantity. After passing through the sensing ... | 09/22/1998 |
| 5796347 | Control of a device in an inaccessible location An arrangement is provided to power and initiate the output of information sensed and/or stored by a device in a sealed environment having a viewing window. The device is powered and the output is initiated by the input of a light source to the device. Wh... | 08/18/1998 |
| 5781003 | Electric field sensor By using an electric field sensor comprising a sensor head 100 for producing a transmitted light wave having an intensity which varies in dependence upon an intensity of an electric field applied thereto, an optical fiber 8 for delivering a light wave fro... | 07/14/1998 |
| 5780845 | Optical current transformer In an optical current transformer, an optical sensor is made up of two optical sensor units which are independent of each other. Incident light beams are applied to the optical sensor units, and the emergent light beams from the latter are subjected to ad... | 07/14/1998 |
| 5780847 | Verdet constant temperature-compensated current sensor A fiber optic, Faraday-effect current sensor (optical current transducer) which has improved temperature sensitivity due to compensation for temperature-induced variations of the Verdet constant. Fiber optic sensing coils can exhibit shifts in their bias ... | 07/14/1998 |
| 5770946 | Photon assisted sub-tunneling electrical probe, probe tip, and probing method An improved non-contact electrical measurement system, method, probe assembly, and probe. A probe having a photoemissive coating deposited thereon is provided and disposed substantially adjacent a measurement site of a test sample. The photoemissive coati... | 06/23/1998 |
| 5767688 | Electro-optic voltage measurement apparatus A processing unit notifies a drive unit of a designated number N (=1, 2, . . . ) The drive unit supplies a drive signal of a frequency f0 to a target measurement device, and supplies a modulation signal of a frequency N.multidot.f0 +... | 06/16/1998 |
| 5764046 | Optical method and device for measuring an alternating electrical current with temperature compensation In a magneto-optic method of measuring an A.C. current in a conductor, the plane of rotation of linearly polarized light is rotated through a measuring angle in a Faraday element surrounding the conductor, the angle being a measure of the current strength... | 06/09/1998 |
| 5757198 | Method and apparatus for detecting an IC defect using charged particle beam Test patterns are applied to an IC under test under a test pattern address by which the first fail is caused and under other test pattern addresses. A defect candidate area is moved to the position where a charged particle beam can scan the area and defec... | 05/26/1998 |
| 5751143 | Opto-electronic system for the acquisition of signals indicating the presence of a voltage and its phase An opto-electronic system for the acquisition of signals indicating the presence of a voltage and its phase in distribution boards, and generally in any medium voltage or high voltage installation by means of the use of optical fibers of PVC with conseque... | 05/12/1998 |
| 5747985 | Optical-electronic demand meter using optical metering outfit An optical-electronic demand meter using an optical metering outfit (MOF) is disclosed. The optical-electronic demand meter includes: a light emitting device driving circuit for sending light rays through an optical fiber to an exclusive optical MOF; a li... | 05/05/1998 |
| 5742157 | Optical fiber magnetic-field sensor An optical magnetic-field sensor has: a GRIN rod lens; optical fiber for incident light and optical fiber for outgoing light, which are arranged on one end of the GRIN rod lens; first and second reflection mirrors both being on the other end of the GRIN r... | 04/21/1998 |
| 5736737 | Concatenated magneto-optic field sensors A Faraday effect current sensor uses a plurality of concatenated field sensors, with a single light source and a single detector. At least two Faraday effect sensing elements (single mode sensing fibers) are used, preferably at least three, the sensing el... | 04/07/1998 |
| 5734263 | Electro-optic voltage transducer with extended range and temperature compensation In an electro-optic voltage transducer utilizing a crystal exhibiting birefringence in a fast axis and a slow axis mutually orthogonal to an optic axis in the presence of an electric field produced by the voltage to be measured, the crystal is mounted for... | 03/31/1998 |
| 5731579 | Electro-optical voltage sensor head A miniature electro-optic voltage sensor system capable of accurate operation at high voltages. The system employs a transmitter, a sensor disposed adjacent to but out of direct electrical contact with a conductor on which the voltage is to be measured, a... | 03/24/1998 |
| 5729005 | Fiber optic current sensor with bend birefringence compensation A fiber optic subassembly for a Faraday-effect current sensor has an optical sensing fiber supported by a tubular holder in a square or rectangular configuration, with the three of the four corners thereof designed with bends which have a net zero bend-in... | 03/17/1998 |
| 5715058 | Method and device for the optical determination of a physical quantity In order to detect, in particular, a high electric voltage (8), use is made of an electrooptic sensor with an electrooptic crystal (4) such as is applied in Pockels cells. Light is irradiated into the electrooptic crystal (4) in a linearly polarized fashi... | 02/03/1998 |
| 5703491 | Voltage detection apparatus This invention has as its object to provide a voltage measurement apparatus which has a compact probe unit, and which can perform a measurement in a non-contact manner. The voltage measurement apparatus includes detection means for detecting an electric f... | 12/30/1997 |
| 5698847 | Optical-modulation-type sensor and process instrumentation apparatus employing the same An optical-modulation-type sensor comprises an input condenser lens for collecting light from a light source, a polarizer for linearly polarizing the light from the input condenser lens, a light-transmissive piezo-oscillator which is provided with an osci... | 12/16/1997 |
| 5677678 | Fault indicator having auxiliary fault sensing winding A fault indicator is described which indicates the occurrence of a fault current in a monitored electrical conductor. The fault indicator includes a magnetic pole assembly which mounts the housing of the fault indicator to the monitored electrical conduct... | 10/14/1997 |
| 5677635 | Voltage and displacement measuring apparatus and probe A voltage and displacement sensitive probe with an electro-optic crystal, electrically conductive transparent films and adhered to a pair of parallel surfaces on the electro-optic crystal, a transparent elastic film which circumferential portion is bonded... | 10/14/1997 |
| 5677622 | Current sensor using a Sagnac interferometer and spun, single mode birefringent optical fiber to detect current via the Faraday effect A current sensor which makes use of the Faraday effect, which is patterned on a Sagnac interferometer and which employs a coil of spun birefringent optical fibre for sensing the magnitude of current flowing through a conductor about which the sensor is, i... | 10/14/1997 |
| 5670871 | Polymeric film electrooptic sensor device This invention provides an electrooptic sensor device which is adapted to measure micro-circuit electrical signals with subpicosecond resolution. The sensor device has an electrooptic organic polymer film matrix. The sensor device is positioned adjacent t... | 09/23/1997 |
| 5670870 | Electric field sensor capable of reliably measuring an electric field intensity of a signal An electric field sensor includes an electric field sensor head (13) for varying an intensity of a propagating light beam from a light source (19) in response to an electric field intensity of an input signal received by a reception antenna (11). A photo-... | 09/23/1997 |
| 5666062 | Voltage measuring using electro-optic material's change in refractive index In this system, reflected light from an electro-optic probe is detected by a photodetector, and only a voltage signal of a frequency which is an integral multiple of the fundamental frequency of the output voltage from the photodetector is detected. The f... | 09/09/1997 |
| 5666048 | Technique and apparatus for measuring a direct current flowing through a conductor at high voltage A technique and circuit for measuring direct current flowing through a conductor at a high voltage employs a capacitor connected in series with the conductor, and a neon lamp connected in parallel with the capacitor. The series connected capacitor and con... | 09/09/1997 |
| 5663639 | Apparatus and method for optical heterodyne conversion An apparatus and method for optical heterodyne conversion and a radiation source and integrated diagnostics using the apparatus and method are disclosed. The radiation source can operate in a high-power narrow-band mode in which a constant-frequency outpu... | 09/02/1997 |
| 5656935 | Variable color display system A variable color display system exhibits a display unit in a color in accordance with the value of a limit. The color signals are developed in accordance with the value of the limit and applied to a color control input of the display system to control its... | 08/12/1997 |
| 5656934 | Optical method of measuring an alternating electrical current, including temperature compensation, and a device for carrying out the method An alternating current in a conductor is measured using a Faraday element. The Faraday element is disposed around the conductor and linearly polarized light is supplied to the device. The plane of polarization of the linearly polarized light is rotated th... | 08/12/1997 |
| 5642040 | Electrooptic probe for measuring voltage of an object having a high permittivity film fixed on an end face of a reflecting film fixed on an electrooptic material An electrooptic probe for measuring voltage of an object without contact with the object. The electrooptic probe according to the present invention includes an electro-optic material having a refractive index to light that varies in accordance with an ele... | 06/24/1997 |
| 5635831 | Optical voltage and electric field sensor based on the pockels effect An optical voltage/electric field sensor includes a crystal having a refractive index distribution which depends on an electric field applied thereto, wires for leading the electric field onto the surface of the crystal, a detector to detect changes in th... | 06/03/1997 |
| 5635830 | Optical magnetic field sensor employing differently sized transmission lines A magneto-optical element is of a rare-earth iron garnet crystal expressed at least by formula 1, and a element in whose composition range the value of X is set at 0.8ࣘXࣘ1.3; that of Y at 0.2ࣘYࣘ0.4; that of Z at 0.1ࣘZࣘ0.9; and that of W a... | 06/03/1997 |
