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| Number | Title | Issue Date |
| 5420100 | Planar squid magnetometer with inductively coupled microstrip resonator A planar SQUID magnetometer for detection and measurement of an applied magnetic flux is disclosed wherein a planar microwave-resonant element overlaps a Josephson device incorporated in a high-Tc superconducting, thin-film SQUID device, thereb... | 05/30/1995 |
| 5414345 | Apparatus and method for low cost electromagnetic field susceptibility testing Apparatus and method for low cost monitoring the level of signal at a test point in a system for susceptibility to electromagnetic fields. A probe, including a detector diode, and a non-metallic, electrically overdamped conductor, which is transparent to ... | 05/09/1995 |
| 5384543 | Portable microwave instrument for non-destructive evaluation of structural characteristics A portable microwave instrument for evaluating characteristics of a structural member includes a source of microwave energy, a transmitter coupled to the source of microwave energy for transmitting a microwave signal at the structural member, and a receiv... | 01/24/1995 |
| 5376276 | In situ primary froth quality measurements using microwave monitor Aerated bitumen froth containing bitumen, water, air and solids is the product of the hot water extraction process for recovering bitumen from oil sand. Measurements related to the water content of the froth can be obtained by measuring its resonant frequ... | 12/27/1994 |
| 5369369 | Determination of carbon in a fly ash sample through comparison to a reference microwave attenuation and phase shift An apparatus and method to measure the unburnt carbon content of fly ash. A microwave signal is transmitted through or reflected from a fly ash sample and the attenuation or phase shift of the signal received by a detector/detectors is determined with res... | 11/29/1994 |
| 5363049 | Single device under test (DUT) port common reference/matching impedance cirtuit for the detection and location of DUT faults Disclosed is a Device Under Test (DUT) fault detection and location circuit. A first circuit port is connected to the DUT for fault detection and location. A signal source for generating a series of signals across the operating frequency range of the DUT ... | 11/08/1994 |
| 5334941 | Microwave reflection resonator sensors A highly sensitive, direct-contact, in situ sensor for nondestructively measuring or monitoring the complex dielectric and conductive properties of solids, liquids, or gasses at microwave frequencies. A metal microstrip dipole resonator (11) is etched on ... | 08/02/1994 |
| 5279403 | Microwave security thread detector A security thread detector for verifying the authenticity of banknotes. In the preferred embodiment, the invention comprises a housing with a passage through which banknotes can be passed, wherein the housing also comprises a waveguide, a microwave oscill... | 01/18/1994 |
| 5185579 | Detection and ranging of material flaws using microwave transmission line reflectometry A structure integrity monitoring apparatus and method for use with certain structures such as air-frame structures. A meandering transmission line (22) or serpentine coaxial cable is adhered to a dielectric substrate (20). The dielectric substrate may be ... | 02/09/1993 |
| 5177444 | Determination of carbon in fly ash from microwave attenuation and phase shift In the determination of the unburnt carbon content of fly ash, a microwave signal is transmitted through or reflected from a fly ash sample and the attenuation and phase shift of the transmitted or reflected signal from receiver antenna or circulator resp... | 01/05/1993 |
| 5177445 | Method and apparatus for detecting and locating a selected non-metallic material in a detection region Particular non-metallic materials are detected by a recognition of the way in which their electrical properties vary with the frequency of an applied alternating electric field. In one method a body being tested is subjected to electromagnetic radiation a... | 01/05/1993 |
| 5157338 | Antenna VSWR indicator The invention described a pocket size antenna VSWR indicator having a self-contained low level wideband RF signal source which is applied to an antenna under test through a four arm RF resistive bridge circuit. The bridge circuit has been designed to be v... | 10/20/1992 |
| 5146171 | Full reversing millimeter test set A full reversing millimeter test set comprising a pair of test head assemblies which are connected to an analyzer by means of coaxial cables enclosed within a sheath. Microwave signals are sent to the test head assemblies and therein frequency-multiplied ... | 09/08/1992 |
| 5121067 | Directional sampling bridge A floating sampler and directional bridge for use in characterizing the impedance of an integrated device under test from D.C. up to frequencies above 100 GHz. The directional bridge has the structure of a Wheatstone bridge with resistor values selected s... | 06/09/1992 |
| 5119035 | Millimeter and/or submillimeter network vector analyzer A millimeter and/or submillimeter network vector analyzer comprises a millimeter source and a millimeter heterodyne receiver, and the network to be analyzed is placed between the source and the receiver. The millimeter source comprises a first microwave s... | 06/02/1992 |
| 5103181 | Composition monitor and monitoring process using impedance measurements Radio frequency bridge techniques are used to parameterize the complex dielectric properties of solids, liquids, gasses and mixtures thereof. This parameterization is performed in an electrically isolated, physically open structure which allows continuous... | 04/07/1992 |
| 5103182 | Electromagnetic wave measurement of conductive layers of a semiconductor wafer during processing in a fabrication chamber A non-invasive sensor system (50) for real-time in situ measurements of sheet resistance and thickness of conductive layers of a semiconductor wafer. The sensor (50) includes a microwave source (78) for generating a plurality of microwave signals. An emit... | 04/07/1992 |
| 5097227 | Microwave oscillator position sensor A microwave oscillator circuit having an antenna, wherein the effective reactive impedance of the oscillator circuit is altered by the movement of a reactive impedance changing element past the antenna to cause change of the oscillation condition of the o... | 03/17/1992 |
| 5086279 | Method of and apparatus for measuring the moisture content of fibrous materials A hygroscopic commodity, such as a continuous stream of shredded tobacco, is transported past one or more sources of electrical energy and past one or more monitoring devices. One of the sources can expose the stream to the electric field of a capacitor i... | 02/04/1992 |
| 5083090 | Contactless measurement of the electrical resistance per unit length of filaments A non-contacting method of measuring the electrical resistance per unit length of a filament, such as a carbon-coated optical fibre, makes the filament the inner conductor of a co-axial transmission line and measures a propagation characteristic of that l... | 01/21/1992 |
| 5079507 | Automatic impedance adjusting apparatus for microwave load and automatic impedance adjusting method therefor There are disclosed an automatic microwave impedance adjusting apparatus for a microwave load connected to a microwave oscillator through a microwave transmission line, and an automatic microwave impedance adjusting method therefor. In the apparatus and m... | 01/07/1992 |
| 5073756 | Method and apparatus for measuring the volumetric water content of mineral and/or organic mixtures A method and an apparatus for determining the volumetric water content of a mineral and/or organic mixture with dielectric measurements. The apparatus includes a probe body having a hollow cylinder formed of an insulating material with an annular cutting ... | 12/17/1991 |
| 5072188 | Apparatus for measuring the conductivity of paint spray using an electromagnetic wave An apparatus and method for measuring the conductivity of a fluid. The apparatus 10 provides both a contact and non-contact monitoring of fluid conductivity by measuring the A.C. dielectric properties of the fluid. The apparatus 10 transmits an electromag... | 12/10/1991 |
| 5059914 | Microwave device for the continuous measurement of the viscosity of a viscous medium Microwave device for the continuous measurement of the viscosity of a viscous medium. The device includes a microwave source connected via a microwave guide to a sensor essentially incorporating at least one semi-rigid, coaxial microwave guide (2) for imm... | 10/22/1991 |
| 5034708 | Programmable broadband electronic tuner A programmable microwave network test device is capable of establishing a multitude of reflection and transmission coefficients determined by a set of digital inputs. The programmable network enables the collection of groups of measurements which are used... | 07/23/1991 |
| 4994749 | Liquid sensor with high sensitivity near empty A fuel or fluid level measurement arrangement for a spacecraft includes one or more electromagnetic transmission lines extending into the reservoir. The presence of fuel adjacent the transmission line changes the dielectric constant or loss characteristic... | 02/19/1991 |
| 4977377 | Microwave water cut monitor with temperature controlled test cell A petroleum stream microwave water cut monitor includes test cell means which contains a reference petroleum multiphase fluid sample and which has a sample stream of a petroleum stream passing through it. The test cell is maintained at a predetermined tem... | 12/11/1990 |
| 4977376 | Method for disturbance reduction in measurement systems for analysis of emission or transmission processes For the reduction of noise signals, and particularly crosstalk signals, in measurement systems for analyzing emission or transmission processes and composed of a serial arrangement of a signal source (1), a measurement path (2) with or without a transmiss... | 12/11/1990 |
| 4970467 | Apparatus and method for pulse propagation analysis of a pipeline or the like A system for ascertaining the existence and location of anomalies along the length of a member, such as an underground pipeline. Electrical pulses are imparted to the pipeline at opposite ends thereof, with these pulses being synchronized so that they mee... | 11/13/1990 |
| 4962359 | Dual directional bridge and balun used as reflectometer test set A test set for use in measuring S-parameters with a network analyzer includes a first directional bridge, a second directional bridge and a single balun with two outputs mounted in an RF housing. A test signal from an RF signal source is transmitted throu... | 10/09/1990 |
| 4958294 | Swept microwave power measurement system and method A swept microwave power measurement system and method capable of performing accurate high performance absolute power measurements on the fly for integration with a scalar analyzer. The system interpolates a calibration factor of the detector at a given fr... | 09/18/1990 |
| 4904927 | Method for measuring a characteristic impedance and a propagation constant of a two-port network In a method for measuring a characteristic impedance and a propagation constant of a two-port network (2), an output port (5) of the two-port network (2) is successively terminated with at least two different finite known impedances (3a, 3b) which are ind... | 02/27/1990 |
| 4902961 | Microwave system for monitoring water content in a petroleum pipeline A method and apparatus for determining the water content of crude oil in a pipeline is disclosed. The device consists of S-band tarnsmitting and receiving antennas, and X-band transmitting and receiving antennas. These are used to determine the complex di... | 02/20/1990 |
| 4896096 | Reflected signal measurement blanking circuit A reflected signal sampler for use in a network analyzer having a pair of diodes for sampling a signal reflected from a device under test (DUT). An amplitude detector for detecting the amplitude of a signal transmitted through the DUT. A reverse bias circ... | 01/23/1990 |
| 4868494 | Methods and apparatus for frequency response analysis In a frequency response analyser for operation at high frequencies a signal of frequency F for application to a system under test (15) is generated from a frequency synthesizer (11) capable of operation only at a relatively lower frequency F/K by generati... | 09/19/1989 |
| 4853950 | Impedance measuring apparatus for R.F. baseband signals over two wire telephone lines A simple impedance measuring tool is provided for performing an accurate but inexpensive determination of impedance and assurance of an impedance match in an installation environment. The apparatus operates according to a method wherein the average instan... | 08/01/1989 |
| 4820912 | Method and apparatus for checking the authenticity of documents A method and an apparatus for checking the authenticity of documents, such as banknotes or credit-cards. The documents comprise a number of randomly distributed conductive fibres of which the distribution is scanned by microwaves and the response is trans... | 04/11/1989 |
| 4764718 | Microwave oil saturation scanner The present invention is comprised of a non-intrusive microwave sensor system for measuring fluid saturation or multiple fluids contained within a flowline or a fluid saturated porous medium. Here, the microwave oil saturation scanner (MOSS) comprises a t... | 08/16/1988 |
| 4647871 | Adaptive impedance mismatch detector system An adaptive impedance mismatch detector system is provided for determining whether or not a particular load impedance is matched or mismatched to the characteristic impedance of a transmission line. The detector system is capable of determining if a parti... | 03/03/1987 |
| 4644260 | Coupler with coupled line used to cancel finite directivity A directional coupler is disclosed comprising either a stripline or microstrip transmission line coupler apparatus serially coupled to an error correcting circuitry which is designed to minimize the standing wave in the coupled line. Elimination of the st... | 02/17/1987 |
