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| Number | Title | Issue Date |
| 8178830 | Optical pressure switch, door operating system and method A door having a pneumatic sensing edge is operated automatically to open when an object and the edge make contact An optical pressure switch (10) in fluid communication with gas forced from the edge on contact with the object initiates the operation of a door... | 05/15/2012 |
| 7973274 | Tactile sensor module with a flexible substrate adapted for use on a curved surface and method of a mounting tactile sensor The invention provides a tactile sensor module that enables adjustment of the density of sensing elements and adjustment of mounting regions to be carried out in a straightforward manner with one type of module that is highly adaptive to complex curved surfaces. A t... | 07/05/2011 |
| 7612328 | Foil-type pressure sensor A foil-type pressure sensor includes a first foil and a second foil. A spacer is arranged in between the first and second foils, which keeps the foils at a certain distance from each other. The spacer presents an opening that defines a sensing region. In this sensin... | 11/03/2009 |
| 7399954 | System and method for an optical navigation device configured to generate navigation information through an optically transparent layer and to have skating functionality A method and system for an optical navigation device configured to generate navigation information through a transparent layer. Specifically, the optical navigation device includes a light source that is configured to illuminate a reflective surface through a layer ... | 07/15/2008 |
| 7272976 | Pressure sensor A pressure gauge includes a diaphragm having a substantially rigid outer portion and a displaceable inner portion that displaces in response to a pressure difference between first and second sides of the diaphragm. The pressure gauge further includes a sensor locate... | 09/25/2007 |
| 7266261 | Fiber optics differential pressure transducer A fiber optics differential pressure transducer (100, 200, 300, 400) containing Bragg networks (118), said transducer being used to measure the differential pressure in a Venturi installed inside a pipe (1), through which a fluid like oil is dis... | 09/04/2007 |
| 7151872 | Method, system and module for monitoring a power generating system A sensing module positioned about an optical fiber cable having a long axis. The optical fiber includes a core that transmits light through the optical fiber cable. The sensing module includes a first short-period fiber grating positioned about the core. A second sh... | 12/19/2006 |
| 7137679 | Ink consumption detecting method, and ink jet recording apparatus The present method detects an ink consumption condition in an ink cartridge loaded on an ink jet recording apparatus having a recording head for jetting ink drops, using a piezo-electric device mounted on the cartridge. The method detects the ink consumption conditi... | 11/21/2006 |
| 7104135 | Optical pressure-sensing system and method for sensing pressure The optical pressure-sensing system essentially comprises a light source, a resonant cavity and a detector, where the light source is used for generating a light with a predetermined wavelength, the resonant cavity includes a stationary wall with a stationary plane ... | 09/12/2006 |
| 7073400 | Sensor for measuring pressure in a sealed volume A sensor for measuring a force is provided, which sensor includes a first sealed volume, a second sealed volume, a pressure diaphragm and a force diaphragm. The pressure diaphragm has a first side and a second side, with a pressure of the first sealed volume acting ... | 07/11/2006 |
| 7074191 | Method and device for non-intrusive measurement of blood pressure in a circuit of a dialysis machine A method for the non-intrusive measurement of blood pressure in a circuit of a dialysis machine, using a device provided with a sleeve forming a portion of the blood circuit and having at least one part which moves according to the pressure difference between the in... | 07/11/2006 |
| 7051594 | Pressure gauge and medical apparatus with same Pressure gauges used to indicate the pressure of the air being supplied to a patient during resuscitation should be able to indicate the pressure quickly and simply. In the present disclosure, a medical apparatus includes an apparatus body defining a fluid cavity th... | 05/30/2006 |
| 6995352 | Fiber optic based method and system for determining and controlling position of a sliding sleeve valve An apparatus and method for determining the position of a hydraulically actuated sliding sleeve valve in real time is disclosed. The apparatus comprises, in a preferred embodiment, a reference sensor and a position sensor, both of which constitute fiber optic windin... | 02/07/2006 |
| 6924475 | Optical transducers and method of making same An optical transducer includes a light source and a light detector mounted on a base member in laterally spaced relation to each other, a deformable membrane overlying the light source and light detector, and a light transparent body between the light source and lig... | 08/02/2005 |
| 6758086 | Automotive cylinder pressure sensors Several associated techniques and fiber optic constructions are disclosed to protect a diaphragm type fiber optic cylinder pressure sensor from the effects of maximum under hood temperatures and to minimize errors associated with rapidly changing under hood and engi... | 07/06/2004 |
| 6619134 | Measuring device for measuring small forces and displacements The object of the invention is a measuring device for measuring small forces and displacements having in a body (1) of the device a detector means comprising a light source (4) and a position-sensitive detector (5), and a sensing means comprising a spring... | 09/16/2003 |
| 6462329 | Fiber bragg grating reference sensor for precise reference temperature measurement A fiber Bragg grating reference module provides a precise temperature reference for a temperature probe, including a thermistor, located in close proximity thereto, and includes an optical fiber having a fiber Bragg grating therein, a glass element and a ... | 10/08/2002 |
| 6450037 | Non-intrusive fiber optic pressure sensor for measuring unsteady pressures within a pipe Non-intrusive pressure sensors 14-18 for measuring unsteady pressures within a pipe 12 include an optical fiber 10 wrapped in coils 20-24 around the circumference of the pipe 12. The length or change in length of the coils 20-24 is indicative of the unste... | 09/17/2002 |
| 6422084 | Bragg grating pressure sensor A fiber grating pressure sensor includes an optical sensing element 20, 600 which includes an optical fiber 10 having a Bragg grating 12 impressed therein which is encased within and fused to at least a portion of a glass capillary tube 20 and/or a large ... | 07/23/2002 |
| 6397745 | Method and apparatus for maintaining ink level in ink fountain of printing press An ink management system for an offset printing press includes a cartridge of offset printing press ink, wherein the cartridge has an exit opening in one end through which ink is dispensed and an open end opposite said exit opening. A movable member is di... | 06/04/2002 |
| 6341526 | Micromachined diffractive pressure sensor system An improved optical pressure sensor determines the pressure of the fluid to be monitored by the deflection of a diaphragm in the pressure chamber of the sensor which has an inlet from the measured vessel. The deflection of the diaphragm is determined by m... | 01/29/2002 |
| 6321603 | Pressure sensor A device (100) for measurement of pressure in fluids is disclosed that includes a cylindrical housing (101) having a pressure port (103), an inner cavity (102) and an opening (102b). A closed pipe (131) is situated in the cavity (102) and closes the openi... | 11/27/2001 |
| 6222184 | Device for measuring the surface pressure The object of the invention is a device for measuring the surface pressure of a film formed at the interface of a liquid and gaseous phase, the device comprising a detector means and a sensor means. The detector means comprises a light source and a positi... | 04/24/2001 |
| 6122971 | Integrated fiber optic combustion pressure sensor An optical pressure sensor assembly integrated with a spark plug (16) and spark plug boot (12). The pressure sensor comprises an optical fiber (34) with a pressure diaphragm (36) at the tip to sense pressure and pressure changes within the combustion cham... | 09/26/2000 |
| 6038926 | TDM array of optical non-acoustic pressure sensors A pressure measuring device which utilizes an array of optical, non-acoustic pressure sensors with a laser light source which generates a pulsed light signal into a light transmitting cable, wherein the pulsed light signal propagates along the light trans... | 03/21/2000 |
| 6016703 | Noninvasive load and pressure sensor system utilizing the principle of refraction of light through a compressible fluid The present noninvasive load and pressure sensing system makes use of a transparent pressure vessel that is filled with a compressible fluid, whose refractive index changes as a function of the pressure applied to the compressible fluid to redirect the pa... | 01/25/2000 |
| 5983725 | Tactile pressure sensor In a tactile opto-electronic pressure sensor having a body with a rigid matrix including axially extending bores in which hollow cylinders of an elastic material are firmly disposed such that the front ends of the hollow cylinder project from one side of ... | 11/16/1999 |
| 5969838 | System for attenuation of noise A noise attenuation system for use with sound receiving devices, including first and second relatively small optical microphone devices having at least one sound responsive membrane operative to produce an output signal in accordance with sound waves pick... | 10/19/1999 |
| 5965880 | Tactile opto-electronic pressure sensor In a pressure sensing system comprising a tactile pressure sensor with an opaque cylindrical body disposed in a tube and having axial passages extending between its opposite end faces, an electroluminescent foil is disposed at one end face and a support b... | 10/12/1999 |
| 5925879 | Oil and gas well packer having fiber optic Bragg Grating sensors for downhole insitu inflation monitoring The present invention features an apparatus comprising a packer means and a packer pressure sensing means. The packer means inflates to isolate zones in a well, such as an oil well or a gas well. The packer means responds to a material for inflating and p... | 07/20/1999 |
| 5908988 | Optical vacuum pressure gauge An incident ray is emitted into a vacuum probe manufactured by a transparent material inside a cavity and is totally reflected according to the invention. Based on Fresnel's equation, when an angle of incidence is fixed, the phase difference between a s-p... | 06/01/1999 |
| 5619046 | Method of manufacturing a measuring device The invention concerns a method of manufacturing a measuring device of the Fabry-P erot resonator type. The invention likewise concerns a measuring device manufactured by means of the method. The measuring device is particularly intended for measurement o... | 04/08/1997 |
| 5604318 | Optical pressure detector The invention relates to an optical pressure detector for instance in the form of an optical alarm with a multimode light guide (1) imbedded in a contact pad (2) subject to pressure, said light guide being curved by the compression of the contact pad (2).... | 02/18/1997 |
| 5532479 | Temperature, pressure, vibration or humidity sensor based on reflected light from a bimetallic, plastic or dehumidifying material A multi-function sensor using a semiconductor laser capable of sensing a value of a measurement object such as temperature, humidity, pressure or vibration on the basis of a variation in the distance between a measurement object medium adapted to respond ... | 07/02/1996 |
| 5517022 | Apparatus for measuring an ambient isotropic parameter applied to a highly birefringent sensing fiber using interference pattern detection An apparatus and a method are provided for measuring an ambient physical parameter applied to a highly birefringent sensing fiber. A light source emits a low coherence light beam into a sensing fiber subjected to an ambient physical parameter. A collector... | 05/14/1996 |
| 5488224 | System for characterizing flow pattern, pressure and movement of a fluid A system for characterizing the pressure, temperature, movement and flow patterns of a fluid under high pressure within a test cell. The test cell is lined internally with adjustable rock facings. Pressure is measured within the test cell using a device e... | 01/30/1996 |
| 5481919 | Force multiplying pressure transmitter diaphragm and method employing flexible force transmitting column A pressure transmitter converts input pressures on the order of 0.000.15 inch of water column to proportional electrical output signals. A housing defines an open internal chamber and a substantially constant area shaped membrane spans the chamber and is ... | 01/09/1996 |
| 5446279 | Fiber optic sensor sensing curvature of a diaphragm A first surface of a diaphragm is exposed to high temperature gas in the combustion chamber of an internal combustion engine. The curvature of the diaphragm changes in response to the gas pressure. Three optical fibers are spaced along a radius of the dia... | 08/29/1995 |
| 5425273 | Fiber optic pressure sensor with inclusions in a compressible transparent material A pressure sensor for connection to a transmission optical fiber which allows the transmission of a light beam. The pressure sensor comprises a material which is essentially elastic to deformation and optically transparent to the wavelengths of light used... | 06/20/1995 |
| 5422478 | Fiberoptic pressure sensor having drift correction means for insitu calibration An improved intensity-encoded fiber optic sensor incorporating novel drift correction and filtering means is disclosed. The first embodiments of the invention relate to means for removing unwanted higher-order core and cladding modes from an intensity-enc... | 06/06/1995 |
