Class 250/900 - OPTICAL LIQUID LEVEL SENSORS

Subclass of Class 250 - Radiant energy
Definition: Art collection of liquid level sensor photocell systems
No. of patents: 25
Last issue date: 06/17/2008

Number	Title	Issue Date
7388222	High-temperature optical liquid level sensor The invention provides an optical liquid level sensor used to determine the level of a liquid within a vessel. The sensor includes two adjacent elongated optical elements, such as optical fibers, which connect a first end, or “sensing end”, to a second end, or �...	06/17/2008
7259384	Fluid level optical detector with float having opaque and transmissive portions Systems and methods for fluid level detection are disclosed. In one embodiment, a sensor assembly includes at least one optical fiber adapted to at least one of transmit and receive an optical signal, and a moveable float member. The float member is adapted to move ...	08/21/2007
7234830	Optical switch An optical switch having a housing, a light source and a light detector. The light source and light detector are located remote from the housing. The light source is connected to the housing with a first light guide, and the light detector is connected to the housin...	06/26/2007
7128812	Apparatus and method for determining the level in a coke drum A foam level in a delayed coking drum is detected by utilizing the varying density of the boiling mass in the coke drum which has larger bubbles and is less dense at the top and smaller bubbles and a higher density at the bottom. A plurality of radiation detectors a...	10/31/2006
7126148	Neutron detection based on boron activated liquid scintillation A system for detecting neutron radiation. A liquid cocktail mixture comprised of a neutron absorber and a scintillator is housed in a Teflon® tube having a mirror at one end of the tube and a windowed portal at the other end of the tube. Neutrons that penetrate the...	10/24/2006
7104127	Nondestructive method for inspecting cladding tubes The present invention relates to a nondestructive method or inspecting defects of the cladding of a nuclear fuel rod, which is featured by a wave emitter obliquely discharging an inspection wave to an inspected tube and a receiver arranged at a side of the inspected...	09/12/2006
7049622	Optical position sensor for determining the interface between a clear and an opaque fluid An inexpensive, optical position sensor for measuring a position or length, x, along a one-dimensional curvilinear, coordinate system. The sensor can be used, for example, to determine the position of an interface between a clear and an opaque fluid (such as crude o...	05/23/2006
6925871	Level sensors A level detector comprises an array of light emitting devices mounted in a line parallel to an array of light receiving devices, the arrays being mounted within a housing capable of internally reflecting light from the emitting devices to respective receiving device...	08/09/2005
6789585	Refrigerator and automated liquid dispenser therefor The invention relates to an automated liquid dispenser employing ultrasonic sensing to determine the level of a dispensed liquid with respect to the height of a container to be filled. In one aspect, the invention relates to a refrigerator with an automated liquid d...	09/14/2004
6703635	Method and apparatus for measuring the level of liquid using optical fiber strain gauge For measurement of a liquid level, an optical fiber connected at its one end portion to force receiving means movably arranged in liquid to receive force from the liquid is dipped in the liquid together with the force receiving means, and a change in the ...	03/09/2004
6658933	Fill-level indicator for a liquefied-petroleum-gas tank Fill-level indicating device includes an array of optical detectors attached to a mount, vertically spaced apart relative to one another and distributed within the tank over the height of the latter, with each detector including a light source and a recei...	12/09/2003
6522086	Photo curing light system having modulated light intensity control A photo-curing light system in which a modulation of the light intensity or output is controlled via an analogue control voltage to the control line output of the lamp power supply. The control signal results in the lamp current being reduced from its max...	02/18/2003
6014076	Apparatus and method for achieving intrinsic safety using conventional sensors An apparatus and method for monitoring parameters of combustible liquids within a tank includes a plurality of sensors disposable within the tank for generating signals indicative of parameters of the contents of the tank, a display disposed on the outsid...	01/11/2000
5852946	Method and apparatus for detecting fluid level The present invention is a fluid level detector for providing a signal indicative of fluid level in a fluid container. The fluid level detector includes a first light conduit portion for providing light to fluid within the fluid container and a second lig...	12/29/1998
5831268	Sensing device for reflective clear material using infrared LED A sensing apparatus is disclosed for detecting reflective materials in a non-invasive and non-contact manner. The sensing apparatus includes a housing, sensing means disposed within the housing. Circuitry is provided for interpreting the information colle...	11/03/1998
5705815	Device for the detection of liquid surfaces Device for the detection of liquid surfaces including a light source sending light onto a liquid surface, an oscillation element which is moved toward the liquid surface and causes the liquid surface to oscillate upon contact with the surface. The surface...	01/06/1998
5331850	Apparatus for indicating the level of a material in a container An apparatus is provided for indicating a level of a fluid in a reservoir and comprises a first multi-strand fiber optic cable with one end of the strands being disposed for receiving light from a light source for transmission to the second ends. A second...	07/26/1994
5303586	Pressure or fluid level sensor A moveable body, cladding medium, and fiber are arranged to form a sensor suitable for use in monitoring changes in liquid, fluid, and material level and changes in pressure. The moveable body moves in response to changes in pressure or force. Movement of...	04/19/1994
5235179	Evanescent wave liquid level sensor with density compensation An evanescent wave liquid level sensor for measuring the density-compensated level of a liquid in a container. The sensor employs an eccentric core optical fiber fully immersed in the liquid to be measured. Light is injected into one end of the fiber. Som...	08/10/1993
5164605	Fiber optic displacement sensor using fiber optic coil A fiber optic microbend sensor employs a resilient coil (12) with an optical fiber (10) positioned therein. The coil (12) has a predetermined length and pitch. An optical signal is applied to the optical fiber (10) with the coil (12) interrogating a param...	11/17/1992
4804944	Hall effect liquid level sensing apparatus and method Disclosed herein is a Hall-effect liquid level sensing apparatus and method. The device may be mounted on a liquid storage tank and includes at least one float suspended within the tank and floating upon a hollow tube for guidance. The float carries a per...	02/14/1989
4727247	Light attenuation sensing apparatus for measuring physical parameters and other variables utilizing a light conducting member containing a fluorescent material A displacement sensor employs a light conducting member containing a fluorescent material. A source of irradiating light is movable relative to the light conducting member along a track. The irradiating light produces fluorescence within the member at a c...	02/23/1988
4397183	Apparatus for detecting level changes in distance An apparatus useful in detecting changes in distance comprises: a signal emitter capable of emitting a substantially constant signal; a signal reflector capable of reflecting at least a portion of the substantially constant signal and being moveable in a ...	08/09/1983
4036060	Temperature measuring process and probe A process and a probe for measurement of temperatures of a given medium and also for measurement of the density of electromagnetic power of a medium at a given temperature is provided wherein a beam of light is transmitted into a capillary enclosure conta...	07/19/1977
3995167	Fiberoptic fluid level sensing mechanism A fiberoptic fluid level sensing mechanism is provided which is operable for performing fluid level sensing as applied particularly to a mixing and dispensing device. The mechanism embodies light projecting means supported in the device so as to be positi...	11/30/1976

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Class 250/900 - OPTICAL LIQUID LEVEL SENSORS