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| Number | Title | Issue Date |
| 4561309 | Method and apparatus for determining pressure differentials A method and apparatus for sensing a pressure differential between two spaces or areas, including a U-shaped length of hollow tubing having an inlet end and an outlet end which permits the free flow of air through the tubing from the higher pressure area ... | 12/31/1985 |
| 4555950 | Refractive optical fluid pressure sensor The refractive optical pressure sensor of this invention is a system for measuring the pressure of a liquid comprising a light source, a light detector and a capillary formed in a transparent solid. A refractive surface of the capillary is positioned in t... | 12/03/1985 |
| 4555949 | Optical fluid pressure sensor An optical pressure sensor including a light source, a light detector and a capillary system positioned in the light path between the light source and detector. The capillary system inlet receives liquid from the external source to be monitored, and the o... | 12/03/1985 |
| 4554837 | Reflective optical fluid pressure sensor The reflective optical pressure sensor of this invention is a system for measuring the pressure of a liquid comprising a light source and a capillary formed in a transparent solid having a reflective surface positioned in the light path of light from the ... | 11/26/1985 |
| 4547668 | Two-dimensional pressure sensor using retro-reflective tape and semi-transparent medium This invention is a two-dimensional pressure sensor which can be used to determine a pressure distribution across a two-dimensional object which comes in contact with the sensor. The sensor includes a light source, a matrix of light transmitting fiber end... | 10/15/1985 |
| 4543831 | Optical pressure transducer Optical pressure transducers are used in devices for the measurement of the pressure of explosive gasses and liquids. In order to increase the sensitivity of the optical pressure transducer, the diaphragm (3) is made to be reflective on both sides. Two pa... | 10/01/1985 |
| 4543961 | Data transmission system A system is provided for transmitting data through an optical fiber. A beam of light is directed into the optical fiber. A plurality of selective wavelength filter-mirrors are interposed adjacent the optical fiber. Each of the filter-mirrors is operable t... | 10/01/1985 |
| 4539475 | Temperature compensation system for a prism in an optical transducer A system that provides temperature compensation in an optical transducer that uses a prism for the purpose of determining a load applied thereto and which may be used to find the weight of an object. When material such as plastic, glass, crystal and the l... | 09/03/1985 |
| 4536651 | Optical weighing scale utilizing a prism An optical transducer that uses a prism for the purpose of determining a load applied thereto which may be used to find the weight of an object. In accordance with known optical principals, when a load is applied to a material such as plastic, glass, crys... | 08/20/1985 |
| 4531414 | Linear displacement transducer device A transducer device for translating increments of linear displacement by means of opto-electronic sensing into increments of units expressed into units of volts. The device comprises an opto-electronic system, having a pair of co-planar, adjacently dispos... | 07/30/1985 |
| 4522065 | Remote pressure sensor The pressure of a gas within an enclosure is measured without making physical contact with the gas by focusing radiation from a laser onto a section of the gas and, while varying the intensity of the radiation, monitoring the section under measurement for... | 06/11/1985 |
| 4521683 | Pressure-actuated optical switch An optical switching element utilizes a spherical diaphragm mounted for snap-action movement between a concave and convex shape. A light beam is directed through a small aperture to impinge on the diaphragm. The aperture is positioned at a distance from t... | 06/04/1985 |
| 4517834 | Tire pressure sensing systems A tire pressure sensing system has a sensor mounted on the tire hub, the sensor having a mask that is moved on change in tire pressure. Two rows of fibres at the end of a fibre-optic cable are positioned on opposite sides of a slit in the mask. The fibres... | 05/21/1985 |
| 4515473 | Photoelastic stress sensor signal processor A signal processor is arranged to process polarized light signals obtained from a stress sensor of the type having a photoelastic element that responds to stress by causing a phase difference between components of the polarized light propagating through t... | 05/07/1985 |
| 4509370 | Pressure-sensitive optrode Apparatus and method for sensing changes in pressure and for generating optical signals related to changes in pressure. Light from a fiber optic is directed to a movable surface which is coated with a light-responsive material, and which moves relative to... | 04/09/1985 |
| 4502334 | Combined pressure gauge-transmitter A Bourdon tube adapted for connection to a source of fluid pressure operates both a mechanically driven gauge pointer and an optical-electronic transmitter for providing operatively parallel output signals corresponding to values of pressure incurred by t... | 03/05/1985 |
| 4501293 | Gas flow responsive signal output means Signal output means (11) responsive to gas flow and particularly suited for use in gas flow indicator apparatus (10), has first and second pressure-datum valves (24, 25) arranged in downstream order in a gas conduit (16), the second pressure-datum valve (... | 02/26/1985 |
| 4499373 | Differential pressure sensing apparatus A differential pressure sensor has a sensing diaphragm mounted in a body. The curvature of the diaphragm is representative of differential pressure across the diaphragm. Monochromatic light is direct from a source at the diaphragm to set up interference f... | 02/12/1985 |
| 4495819 | Optical pressure sensor An optical device for monitoring pressure is described. The device is capable of monitoring pressure in relatively hostile high temperature, high pressure environments through the use of a pressure-sensitive means having an all-glass housing. The subject ... | 01/29/1985 |
| 4493553 | Method of and apparatus for measuring temperature and pressure In a method of and apparatus for making remote measurements of temperature and pressure in a gas, laser beams are transmitted through the gas to a reflecting target, which may be either a solid surface or particulate matter in gas or the gas molecules and... | 01/15/1985 |
| 4493212 | Fiber optic mass sensor An optical sensing system for detecting a physical parameter such as acceleration, temperature or pressure through parameter induced motion of an optical element in a fiber optic path. The motion of the optical element varies the light transmission throug... | 01/15/1985 |
| 4492121 | Gauge for measuring high transient pressures An article and method is provided for remotely optically measuring high transient isotropic pressures. The arrangement employs a fluorescent crystal (such as a ruby) secured to one end of an elongate optical fiber waveguide for placement in the vicinity o... | 01/08/1985 |
| 4487206 | Fiber optic pressure sensor with temperature compensation and reference An intravascular catheter tip fiber optic pressure sensor wherein a lens element at the end of the fiber optic collimates the light emanating from the fiber and directs the light in a column towards a closely spaced reflecting diaphragm. The diaphragm is ... | 12/11/1984 |
| 4476880 | Apparatus for sensing and indicating vaginal muscle contraction Vaginal muscle contraction is sensed by change of pressure within a flexible, hollow tubular member that is adapted to be compressed in response to muscle contraction. A simple pressure transducer embodies a pressure tube connected with the tubular sensin... | 10/16/1984 |
| 4471660 | Process control instrument using a pneumatically driven resonant element A process control instrument, in which the resonant frequency of a vibrating string varies in accordance with changes in a process parameter being monitored, employs a pneumatic drive system to induce the string into oscillation. Pressurized gas is discha... | 09/18/1984 |
| 4472022 | Vortex flowmeter A vortex flowmeter including a single optical fiber into one end of which a light signal can be transmitted from a source to the other fiber end where it is vortex modulated. Modulated light at the other end is then reflected to a receiver back along the ... | 09/18/1984 |
| 4466295 | Photoelastic sensing means Photoelastic sensing means, and more particularly photoelastic sensing means capable of providing high sensitivity for measuring pressure, force, displacement, acceleration or inertial force, proximity, temperature and other measurands. The photoelastic s... | 08/21/1984 |
| 4464936 | Monitoring apparatus for pressure sensitive devices A monitoring apparatus for pressure sensitive devices is provided which detects the operating state of the monitored device, and which is designed to provide a reliable output even when operated in hostile, corrosive environments. The monitoring apparatus... | 08/14/1984 |
| 4460018 | Ultralow pressure relief valve An ultralow pressure relief valve (10) is disclosed. Sealing fluid (24) is held in place by capillary forces inside capillary tube (12). When pressure in tube (11) exceeds capillary forces, sealing fluid (24) is forced into reservoir (14), protecting pres... | 07/17/1984 |
| 4459477 | Microbending of optical fibers for remote force measurement A system for remote measurement of structural forces includes a plurality of microbend transducers mounted along the length of the structure for microbending an optical fiber in response to structural forces, such as stress acting upon an oil or gas pipel... | 07/10/1984 |
| 4454418 | Integrated optics transducer A transducer utilizes a laser source, photoelastic waveguides, two optical beam paths and detectors for processing optical energy from the laser through a stress transfer medium and thereby detects stress forces present on the transducer. This allows forc... | 06/12/1984 |
| 4452071 | Measurement of fill gas pressure in light bulbs Tungsten halogen lamps require a fill pressure of several atmospheres. To verify the fill pressure at the time of manufacture the pressure is indirectly measured by first measuring the speed of sound within the lamp. A shock wave is produced within the la... | 06/05/1984 |
| 4443700 | Optical sensing apparatus and method A sensor for measuring stress, temperature, pressure, sound, etc. comprising an optical waveguide, preferably an optical fiber waveguide, a light source which injects light into one end of the waveguide, a deformer contacting and deforming the waveguide t... | 04/17/1984 |
| 4428239 | Differential pressure measuring apparatus A differential pressure transducer of the diaphragm displacement type uses optical techniques to measure disphragm displacement. White light from a source is conducted by optical fibres to the transducer and interference is produced between light reflecte... | 01/31/1984 |
| 4403512 | Servo-type capsule-equipped instrument A servo instrument, particularly a servo altimeter, with a minimum of display error. The instrument comprises a capsule assembly, a sector adapted for rotation corresponding to the displacement of the capsule assembly, a photosensor for producing an outpu... | 09/13/1983 |
| 4402224 | Pressure responsive monitoring device for vacuum circuit interrupters The invention discloses a monitoring device for monitoring vacuum pressure of an electrical device employing an evacuated envelope. The invention provide, particularly, a pressure responsive monitoring device which comprises an electric field generating d... | 09/06/1983 |
| 4393713 | Digital pressure-measuring device The pressure-measuring device comprises a first chamber subjected to the pressure to be measured and a second chamber connected to the first through an opening fitted with a valve. The device further comprises a valve-control circuit and an element for de... | 07/19/1983 |
| 4387600 | Fiberoptic pressure gauge The following specification discloses a fiberoptic pressure gauge suitable for use with a tank of compressed gas. In particular, the tank of compressed gas can be utilized by an industrial worker, a fireman, or a diver wherein breathing gas has been store... | 06/14/1983 |
| 4379226 | Method and sensor device for measuring a physical parameter utilizing an oscillatory, light modulation element A light beam is transmitted by a fiber optical cable to a light modulation device such as a vibrating filament, bar or plate. This device or oscillator modulates the light intensity with a frequency which is dependent upon the physical parameter to be mea... | 04/05/1983 |
| 4368645 | Optical pressure sensor A system for sensing pressure features an electrically passive sensing head connected to electrically active components by a fiber optic cable. A preferred embodiment combines a polariscope bracketing a quarter wave plate and a photoelastic medium. The de... | 01/18/1983 |
