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| Number | Title | Issue Date |
| 8030949 | Measurement method for determining moisture content In a method for capacitive determination of the moisture content in a gas to be measured, it is provided that a capacitive element (2) brought into contact with a gas to be measured is operated in the manner of an RC oscillator (5) in charge-discharge ... | 10/04/2011 |
| 7924028 | Method and system for adjusting characteristics of integrated relative humidity sensor A method and system for adjusting characteristics of a relative humidity sensor in order to achieve a desired value of accuracy is presented. A relative humidity sensor charge balance circuit includes a series of sensing capacitors Cx1, Cx2 including a... | 04/12/2011 |
| 7683636 | Structure for capacitive balancing of integrated relative humidity sensor An improved relative humidity sensor apparatus that provides a more accurate measurement of humidity in the presence of water condensation. A series capacitive sensor includes a thin porous platinum top plate, a humidity sensitive polyimide dielectric, and two metal... | 03/23/2010 |
| 7679377 | Measuring apparatus and method for determining a dielectric property, in particular moisture and/or density, in a product The application concerns a measuring apparatus for determining a dielectric property, in particular the moisture and/or density, of a product, in particular tobacco, Cotton or some other fibrous product, having a measuring capacitor, a device for generating a high-f... | 03/16/2010 |
| 7602194 | Apparatus and method of water absorption test for generator stator winding insulator using cross capacitance A method of water absorption for a generator stator winding insulator using a cross capacitance involves detecting a state of the insulator of the stator winding of the generator using a theory of the cross capacitance, and carrying out the water absorption test of ... | 10/13/2009 |
| 7508222 | Electromagnetic flow meter A method of determining the inter-electrode or electrode-to-ground impedance or the filling state of an electromagnetic flow meter having flow sensing electrodes connected to an electrode signal amplifier, the method comprising applying a test input signal to the fl... | 03/24/2009 |
| 7471093 | Capacitive humidity sensor A capacitive humidity sensor includes a detecting portion and a reference portion. The detecting portion includes a first sensor element, and a capacitance of the first sensor element varies in accordance with humidity. The reference portion includes a second sensor... | 12/30/2008 |
| 7403019 | Apparatus and method of water absorption test for generator stator winding insulator using cross capacitance Apparatus and method of water absorption for generator stator winding insulator using a cross capacitance are disclosed. The apparatus includes a sensor using a cross capacitance, and a water absorption testing unit for carrying out the water absorption test of the ... | 07/22/2008 |
| 7378857 | Methods and apparatuses for detecting the level of a liquid in a container A method for detecting the level of a liquid in a container. The method includes applying a predetermined voltage to a level measuring electrode, disposed within the container, for a predetermined first period of time; then, discontinuing the application of the volt... | 05/27/2008 |
| 7345491 | Clothes dryer moisture sensing circuit A moisture sensing circuit for a clothes dryer in which clothes tumble during drying has a pair of spaced apart electrode sensors for sensing the electrical resistance of the clothes when the clothes contact the electrodes. The circuit has an active filter for suppr... | 03/18/2008 |
| 7323886 | Linear capacitance measurement and touchless switch Capacitance measurement apparatus that enhances the sensitivity and accuracy of capacitive transducers, proximity sensors, and touchless switches. Each of two capacitors (C1, C2) under measurement has one end connected to ground and is kept at substant... | 01/29/2008 |
| 7322093 | Method for producing a boundary acoustic wave device In a method for producing a boundary acoustic wave device that includes a first medium, a second medium, and a third medium laminated in that order, and electrodes disposed at the interface between the first medium and the second medium, the method includes the step... | 01/29/2008 |
| 7312703 | Initialization of a sensor for monitoring the structural integrity of a building Initialization of a sensor for monitoring the structural integrity of a building involves the sensor, a gateway and an installer device. An automated initialization brings the sensor online and enables the sensor for remote monitoring without requiring on-site manua... | 12/25/2007 |
| 7295126 | Perforated plane moisture sensor A moisture sensing apparatus, system and method. In general, a surface can be provided, and one or more conductor pairs located in a plane of the surface. Each conductor of the conductor pair(s) is insulated from one another. Water droplets forming on the conductor ... | 11/13/2007 |
| 7292049 | System and method for detecting the dielectric constant of conductive material An improved system and method for providing a dielectric monitor which allows the measurement of the dielectric constant of a conductive material. The capability to accurately and efficiently measure the dielectric constant in soil allows the moisture content of the... | 11/06/2007 |
| 7289916 | Method and apparatus for measuring properties of concrete Methods and apparatus using time domain reflectometry to determine electrical properties of concrete for calculating physical and mechanical properties of the concrete that are indicative of concrete quality and durability. The dielectric constant of a concrete is d... | 10/30/2007 |
| 7278186 | Ultra low frequency moisture sensor An apparatus for measuring a moisture content value within a volume. A frequency generator generates at least one source signal at frequencies of no more than about one kilohertz. Probes are disposed with surfaces in physical contact with the volume, where no direct... | 10/09/2007 |
| 7267002 | Capacitance type physical quantity detector A capacitance type physical quantity detector includes a sensor unit of which the capacitance varies depending upon a change in the physical quantity and a C-V converter unit which converts a change in the capacitance of said sensor unit into a voltage. The C-V conv... | 09/11/2007 |
| 7243541 | Combi-sensor for measuring multiple measurands in a common package A modular sensor system includes a plurality of varying types of sensors that provide multiple sensing measurands for sensing operations. A housing is generally associated with the varying types of sensors, such that the housing introduces media to be sensed by the ... | 07/17/2007 |
| 7239154 | Soil penetrating electrode with conical taper This disclosure describes a Soil Penetrating Electrode with Conical Taper for use with instrumentation for measurement of the electrical properties of soil in situ. The Electrode shape and configuration solves problems of stable and reliable contact with the soil, r... | 07/03/2007 |
| 7235475 | Semiconductor nanowire fluid sensor and method for fabricating the same Nanowire fluid sensors are provided. The fluid sensors comprise a first electrode, a second electrode, and at least one nanowire between the first electrode and the second electrode. Each nanowire is connected at a first end to the first electrode and at a second en... | 06/26/2007 |
| 7230205 | Compressor airfoil surface wetting and icing detection system In some instances, ice can form on the surface of a compressor airfoil. If the ice dislodges, it can impact and damage other compressor components. Aspects of the invention relate to systems for detecting the presence of ice or water on a compressor vane during engi... | 06/12/2007 |
| 7222531 | Capacitive humidity sensor A capacitive humidity sensor for detecting a humidity change includes a first sensor element having a first capacitance, a second sensor element having a second capacitance and connected in series with the first sensor element, and a humidity sensitive layer having ... | 05/29/2007 |
| 7205780 | Multi-frequency capacitive measurement device and a method of operating the same A method and a system is provided that includes a multifrequency generator supplying signals of at least three different frequencies to an electrode assembly, the capacitance of which is detected for a plurality of different frequency points. In this way, the capaci... | 04/17/2007 |
| 7205779 | Apparatus and method for monitoring and determining the moisture content in elastomer materials An apparatus and method for determining and monitoring the moisture content of an elastomer material used as a closure or stopper for containers holding lyophilized pharmaceutical products, comprising a parallel capacitance circuit formed by supplying a source of AC... | 04/17/2007 |
| 7190089 | Device for detecting presence of a user for motor vehicle The invention concerns a device for detecting the presence of a user to allow and/or prevent access inside a motor vehicle, the vehicle comprising at least a decorative element fixed to the body (2) proximate to an opening (O), the device comprising at least ... | 03/13/2007 |
| 7183779 | Soil probe device and method of making same A device for measuring one or more different properties of soil or a soil-related substance is provided. The device includes a probe that is inserted into the soil or soil-related substance. The probe includes a tip. The tip is electrically insulative and defines ap... | 02/27/2007 |
| 7176700 | Moisture sensor device and self-diagnosing method therefor A moisture sensor device includes a sensor portion having a capacitance that is varied in accordance with surrounding humidity, a signal processor for processing a detection signal of the sensor portion and outputting the signal corresponding to the humidity, a heat... | 02/13/2007 |
| 7170302 | Capacitive soil moisture sensor A capacitive soil moisture sensor that is easy to install, does not require complex calibration, can sense moisture at a particular depth, can accommodate soils of different composition, does not alter soil densities, provides fast response to changes in moisture an... | 01/30/2007 |
| 7167773 | Process and apparatus for improving and controlling the curing of natural and synthetic moldable compounds A process for curing a moldable compound under a plurality of curing conditions by: (1) obtaining time dependent data streams of dielectric or impedance values from a plurality of sensors distributed within a curing mold, wherein the moldable compound is a dialectri... | 01/23/2007 |
| 7151381 | Grain moisture sensor A grain moisture meter has a test cell for containing a sample of the particulate material to be tested. A single oscillator includes a variable frequency tuned circuit including the test cell as a capacitor, a calibrated variable standard capacitor, a calibrating c... | 12/19/2006 |
| 7145350 | Process and a circuit arrangement for evaluating a measuring capacitance A process is disclosed for evaluating a measuring device comprising a capacitor (CM), with stages for charging the capacitor (CM) over an initial charging period (tk1, tk2) and for determining the capacitance charge as an initial measured value (tml). ... | 12/05/2006 |
| 7142123 | Method and apparatus for detecting moisture in building materials A moisture sensor system is described. In one embodiment, the system provides an adjustable threshold level for the sensed moisture level. The adjustable threshold allows the moisture sensor to adjust to ambient conditions, aging of components, and other operational... | 11/28/2006 |
| 7129713 | Capacitive moisture sensor A moisture sensing apparatus includes an oscillator for supplying an AC signal to a driven ring of a sensor having a pad inside the ring, and a ground plate around the ring. An amplifier forms part of a temperature-compensated, precision rectifier, and is connected ... | 10/31/2006 |
| 7126352 | Method and device for determining the moisture content and conductivity in the ground and in bulk materials In a method and device for determining the moisture content and conductivity in the ground and in bulk materials, a capacitive sensor is disposed in the ground or the bulk material, the sensor is charged from a constant external voltage supply with a given initial c... | 10/24/2006 |
| 7112971 | Method and apparatus for determining the moisture content of a material In a method and apparatus for determining the moisture content of a material with a measuring line extending through the material and having a proximal end connected to a signal generator for supplying a pulse signal to the measuring line, which pulse signal is refl... | 09/26/2006 |
| 7091830 | Subterranean two-wire power and communications network A combination of frequency and time division multiplexed signals communicates using bursts of higher frequency sinusoidal waves superimposed upon the alternating current in a two-wire power distribution network. A synchronization pattern precedes data, all bursts ha... | 08/15/2006 |
| 7087019 | Apparatus for testing skin moisture An apparatus for testing skin moisture including a casing, a fixed base at the front end of the casing, at least one through hole on the fixed base, a hollow cylindrical metal electrode with a closed end passing through the through hole, and an electrically conducti... | 08/08/2006 |
| 7084644 | Circuit arrangement for capacitive humidity measurement and method for operating the same A circuit arrangement for capacitive humidity measurement that includes a capacitive element to be measured, a plurality of switch elements, a charge storage element and a control unit electrically connected to the capacitive element, the plurality of switch element... | 08/01/2006 |
| 7084776 | Fluid detection apparatus and kit, and method of installation thereof An apparatus for sensing the presence of a conductive fluid on an upwardly facing generally planar surface of a floor, and a method of installation thereof. The apparatus includes an electrically insulating base dimensioned for installation under the floor such that... | 08/01/2006 |
