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| Number | Title | Issue Date |
| 7282903 | Longitudinal balance measuring bridge circuit A longitudinal balance measuring bridge circuit includes a common mode signal injection circuit in the form of a center tapped, 4:1 balanced matching transformer. The signal injection circuit is coupleable to an item under test (IUT) and to a source of common mode s... | 10/16/2007 |
| 7256588 | Capacitive sensor and method for non-contacting gap and dielectric medium measurement A method for non-contact measurement of a displacement between a surface and a capacitive sensor comprised of at least two superimposed conductive plates electrically insulated one from the other and a sensor circuit coupled to the plates including: positioning the ... | 08/14/2007 |
| 6674294 | Drive feedthrough nulling system The present invention relates to a system for nulling drive feedthrough error in a sensor having first and second drive electrodes which impart vibratory motion to first and second proof masses in response to first and second opposite phase drive signals,... | 01/06/2004 |
| 6529017 | Capacitance level measurement circuit and system A capacitance measurement circuit and probe includes a drive circuit couplable to a constant-current source, a threshold detector, a probe capacitor, and a reference capacitor. The circuit includes a plurality of switches being actuatable to alternately c... | 03/04/2003 |
| 6498499 | Device for measuring the capacitance of electrical wires The device for measuring the capacitance of electrical wires has a first and a second measuring tube both connected to a voltage source of high frequency. The first measuring tube has a conventional length while the second measuring tube is significantly ... | 12/24/2002 |
| 6373263 | Differential windshield capacitive rain sensor A capacitive sensor for detecting raindrops on the external surface of a vehicular windshield, relying for its operation on the compensation of the capacitive signals which are due to variation of the dielectric constant of the windshield's glass with tem... | 04/16/2002 |
| 6326795 | Capacitance detection system and method A detection circuit which is capable of outputting a voltage proportional to a static capacitance of a sensor is provided, which comprises a voltage input terminal connected to receive an input voltage and an operational amplifier. The input voltage recei... | 12/04/2001 |
| 5677476 | Sensor and transmitter with multiple outputs A measuring transmitter assembly using the same lines for power input and for output signals and using a single power supply, has a first power input and signal output loop coupled to the power supply, a second power input and signal output loop coupled t... | 10/14/1997 |
| 5566572 | Circuitry to minimize stray capacitance effects in a capacitive liquid level measurement device A time varying excitation current (413) is provided to one side of a capacitive sensor (417), and two signal paths (420,430) are provided between the other side of the capacitive sensor (417) and signal conditioning circuitry (412), each signal path diffe... | 10/22/1996 |
| 5510779 | Error compensating instrument system with digital communications An instrument system provides compensation for signal processing errors by processing both sensor signals and reference signals in a common signal processor. Reference signals may be provided which enable zero compensation, gain compensation, or both. The... | 04/23/1996 |
| 5502659 | Method and apparatus for calibrating moisture sensors An apparatus and method are provided for calibrating a measuring transmitter which provides an output signal proportional to a parameter of interest measured by a sensor in the measuring transmitter without removing the measuring transmitter from its norm... | 03/26/1996 |
| 5423214 | Variable fluid and tilt level sensing probe system Digital tilt level sensing probe system comprising a set of multiple capacitor elements in a fluid container arranged along an axis of measurement where each multiple capacitor element represents a discrete level increment in dielectric material fluid to ... | 06/13/1995 |
| 5325066 | Density compensated pipeline monitor Apparatus and method for determining the water content of an oil and water mixture such as is transported by pipelines and which oil and water may vary in density from time to time. A densitometer measures the density of the oil and water mixture in the p... | 06/28/1994 |
| 5296819 | Polymer capacitative moisture sensitive device comprising heating means A moisture sensitive device includes a polymer capacitive moisture sensitive element and a heater. The polymer capacitive moisture sensitive element is formed by sequentially stacking a lower electrode, a moisture sensitive film made of an organic polymer... | 03/22/1994 |
| 4972155 | Weight responsive moisture tester A test apparatus for determining a given property, by weight, such as moisture content, of a material such as a grain or the like, comprises a chamber for receiving a sample of material to be tested, having an open top portion through which the material m... | 11/20/1990 |
| 4810957 | Device for sensing the number of items stored in a compartment A device for sensing the number of items (14) consecutively disposed in a compartment (12), preferable bottles or cans disposed in a beverage magazine (13) in a refrigerator (10). At each item (14) at opposite sides of said item electric conducting areas ... | 03/07/1989 |
| 4788488 | Continuous condition sensing system A probe developing an admittance with a material whose condition is to be continuously measured is capacitively coupled with a variable frequency oscillator, preferably one having a digital output stage, for generating a variable frequency signal having a... | 11/29/1988 |
| 4683418 | Moisture measuring method and apparatus Moisture in wood veneer strips received from a drying oven is measured by passing a first radio frequency signal through the veneer for reception by a receiving plate, transmitting a second radio frequency signal in out-of-phase relation to the first radi... | 07/28/1987 |
| 4594893 | Probe for measuring the level of liquid in a tank or pipe The capacitor probe is made up of two parts, both of which are in fluid communication with the interior of the tank or pipe the liquid level of which is to be measured. One part (7) of the probe is located at the bottom of the probe and acts as a referenc... | 06/17/1986 |
| 4568875 | Moisture corrected denier measurement Measurements of yarn denier using capacitance transducers are automatically corrected for moisture. Samples of the yarn to be run are tested at different moisture levels at different frequencies in each of two capacitance transducers. The difference in th... | 02/04/1986 |
| 4549134 | Moisture probe and technique A superior moisture probe and technique for assaying liquid and gas streams for moisture concentration in the parts per million (ppm) range, comprises an emf source connected across a pair of adjacent conductive probes separated by a sulfonated aliphatic ... | 10/22/1985 |
| 4468610 | Radio frequency apparatus for measuring moisture content of materials as a function of dielectric constant Apparatus for measuring moisture content of gypsum board and like products as a function of dielectric constant comprising an rf signal source, an antenna disposed for rf field coupling to a test material, first and second reference inpedances, and a cont... | 08/28/1984 |
| 4359638 | Method for continuously determining the composition of butter and similar substances from a manufacturing process A method for continuously determining the water and fat content of a material such as butter which involves instantaneous measurements of the density of the substance, curd content, as well as either the dielectric constant or radiative backscatter intens... | 11/16/1982 |
| 4310794 | Capacitive probe detection systems A capacitive probe detection system is described which incorporates a synchronous switching system to switch the current flow through a capacitive probe to a signal integrating circuit only during the whole of every positive half cycle of the current flow... | 01/12/1982 |
| 4288741 | Electrical measurement of fluid void fraction for fluid having capacitive and resistive conductive components Liquid with solid or gas phases mixed therein is measured as to liquid and non-liquid volume percent by application of an oscillating voltage to the liquid and separation of resultant conductive and capacitive currents to achieve valid and effective measu... | 09/08/1981 |
| 4281286 | Apparatus and method for detecting wet and icy conditions on the surface of a pathway Detection of wet and icy surface conditions on the surface of a pathway is accomplished using a block of electrically insulative material embedded in the pathway with its top surface flush with the surface of the pathway and exposed to atmospheric precipi... | 07/28/1981 |
| 4266188 | Method and apparatus for measuring a component in a flow stream A method and apparatus for measuring the concentration of a particular component, e.g. water, in a two-component mixture, e.g. water-oil. A probe having three sets of sensor electrodes is positioned into the mixture. A first elastic sac is secured over th... | 05/05/1981 |
| 4193116 | Analysis instrument An analysis instrument for measuring selected constituents present in a sample of a material such as a bulk commodity includes a test cell to receive the sample. The test cell comprises a capacitor whose electrical properties are modified in accordance wi... | 03/11/1980 |
| 4075680 | Capacitance densitometer for flow regime identification This invention relates to a capacitance densitometer for determining the flow regime of a two-phase flow system. A two-element capacitance densitometer is used in conjunction with a conventional single-beam gamma densitometer to unambiguously identify the... | 02/21/1978 |
| 4058765 | General displacement sensor General resistive and capacitive circuitry for sensing and displaying liquid or powder level in a container, linear or rotational displacement of a body, ambient moisture content of the atmosphere, and similar physical quantities, using substantially the ... | 11/15/1977 |
| 4021733 | Moisture meters A meter for determining the moisture content of grain or hay uses two variable capacitors. A sample of the material is compressed between the electrodes of one of the capacitors and acts as its dielectric, while the other capacitor, with a known dielectri... | 05/03/1977 |
| 4016790 | Regulation of electronically operated quality control equipment This invention relates to the art of quality control, more particularly to the regulation of electronically operated quality control equipment such as yarn cleaners, or the like so that the quality control equipment may be selectively adjusted to eliminat... | 04/12/1977 |
| 3950698 | Arrangement for determining the moisture content of tobacco and the like The arrangement determines the moisture content of tobacco, in either leaf- or comminuted form, tobacco substitutes, other smokers' products, filter materials, cigarette and cigar papers and wrappings, related and analogous fibrous and other materials, an... | 04/13/1976 |
