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7894652 Prompt gamma correction for non-standard isotopes in a PET scanner  
A method for correcting PET emission data for prompt gamma emission background components present in non-pure positron-emitting isotopes uses a two component fit of modeled scatter and modeled...
7456411 He-3 neutron proportional counter with internal leakage detection and related method  
A radiation detector includes a pressure-tight housing having a peripheral, cylindrically-shaped wall and opposite end closures. An electrode wire extends through a center of the housing, spaced...
7402800 Method and device for the continuous determination of damage to systems used for the post-treatment of heat engine exhaust gases  
The invention relates to a method for the continuous determination of the damage to at least one system (7) used for the post-treatment of exhaust gases from an internal combustion engine (2),...
6953936 Ionization type smoke sensing chamber  
A modular smoke detector has a sensing electrode carried by an insulator module. The insulator module also carries an ionization source and a field effect transistor. The insulator module...
6606899 Total impurity monitor for gases  
A device for measuring a total concentration of impurities in a sample gas is provided which includes a housing having an inlet to allow the sample gas to enter the housing, an emitter to generate...
6567346 Absolute time scale clock  
An absolute time scale clock includes a radioactive isotope and a computer. The computer includes a processor that determines an indication of the current absolute time and a memory that stores a...
6365902 Radiation detector, an apparatus for use in radiography and a method for detecting ionizing radiation  
A detector for detection of ionizing radiation, an apparatus for use in planar beam radiography, comprising such a detector, and a method for detecting ionizing radiation. The detector includes a...
6362743 Smoke alarm with dual sensing technologies and dual power sources  
A smoke alarm having both an ionization detector and a photoelectric detector coupled to each other to generate an alarm signal when either of the detectors senses a potential fire. The smoke...
6320388 Multiple channel photo-ionization detector for simultaneous and selective measurement of volatile organic compound  
A multiple-channel photo-ionization detector (PID) determines the concentrations of specific gases or classes of gases. The PID includes a UV lamp, an optical window which is divided into multiple...
6320261 High aspect ratio metallization structures for shallow junction devices, and methods of forming the same  
A contact interface having a substantially annular silicide ring along sides of a depression formed in an active surface of the semiconductor substrate, wherein the depression is formed by an...
6288400 Portable apparatus for the measurement of environmental radon and thoron  
The radometer is a portable instrument for the measurement of the concentration of atmospheric radon/thoron in a test area. A constant velocity pump pulls the air from the outside at a constant...
6107805 Extended detection zone in an ionization detector  
An ionization detector for detection of an analyte includes a source chamber having a source of ionizing particles and receiving a fluid stream of detector gas; an ionization chamber connected to...
5920072 Ionization detector  
An ionization detector having an upper ionization chamber, a lower ionization chamber, and a radioactive source located in the upper ionization chamber but shielded from the lower ionization...
5679958 Beta particle monitor for surfaces  
A beta radiation detector which is capable of reliably detecting beta radiation emitted from a surface. An electrically conductive signal collector is adjustably mounted inside an electrically...
5633501 Combination photoelectric and ionization smoke detector  
An ionization chamber for use in a smoke detector includes first and second outer electrodes and a non-reflective center electrode. The non-reflective center electrode can be formed as a metal...
5400013 Ionization type smoke detector  
An ionization type smoke detector includes a smoke detecting section including an intermediate electrode and an outer electrode to confine an outer ionization chamber therebetween into which smoke...
5399864 Ionization type smoke detector  
An ionization type smoke detector includes a detector body, a printed circuit board on the upper surface of the detector body, an electrode mount on the upper surface of the printed circuit board,...
5237281 Ion drag air flow meter  
An ion drag air flow meter (10) including a gas ionizer (16), an ion collector (14) and apparatus (30) for converting the collected ions into a signal providing an indication of the flow of a gas...
5223712 Closed loop ionization apparatus for detecting trace gases  
A trace gas detector including in a closed gas loop, two baffle cells with an intermediate trace gas filter, each baffle cell consists of an ionization source, a labyrinth-like recombination zone...
5184019 Long range alpha particle detector  
An alpha particle detector capable of detecting alpha radiation from distant sources. In one embodiment, a high voltage is generated in a first electrically conductive mesh while a fan draws air...
5180917 Self-calibrating proportional counter  
The invention relates to a method and an apparatus for qualifying the operation of a radiation (e.g. neutron) detector containing an ionizable gas (e.g. He3), such as a detector disposed in a...
5153520 Identifying and quantifying the presence of alpha radiation and specific gaseous molecules present in air samples  
Means and methods of detecting particular particles in an air stream at very low concentration levels and identifying the particles and magnitude of concentration are afforded. Thus, a particle...
4864141 Smoke detector with ionization chamber  
A smoke detector is provided having an ionization chamber (1). For counterbalancing the removal of ions (51), taken out of the chamber by the violent air currents (C) passing through this chamber,...
4853544 Heat-resistant case for an ionization-type smoke detector and method of making the same  
An ionization-type smoke detector having a heat-resistant metal case forming the outer electrode and, with an attached rear cover, enclosing the upper portion of an insulating base board. The...
4845474 Smoke and fire detector  
An ionization smoke and fire detector comprises a molded plastic housing that includes a nodal ring for supporting a vibrating plate that is part of an alarm. The alarm may be driven by...
4786811 Ionization type-smoke detector  
An ionization-type smoke detector having inner and outer ionization chambers, a radioactive source to ionize the air within the inner and outer ionization chambers and a printed board to mount...
4761557 Ionization-type smoke detector  
In order to provide an ionization-type smoke detector, wherein the radiation from a radioactive source mounted on the inner electrode disposed within the inner ionization chamber also reaches into...
4705947 Pulsed helium ionization detection system  
A helium ionization detection system is provided which produces stable operation of a conventional helium ionization detector while providing improved sensitivity and linearity. Stability is...
4704536 Gas sensor and gas detecting method  
A gas sensor and a method for detecting a small amount of a gas such as CO contained in air entering a space between electrodes ionized by a radiation source. At least one radiation source is...
4618777 Outer electrode with improved smoke entry  
An outer electrode for a combustion products detector comprising a cylindrical body including a plurality of first slats alternating with a plurality of second slats, the first slats being...
4595914 Self-testing combustion products detector  
A self test circuit for a combustion products detector automatically periodically tests whether the sensitivity of the sensor is in a predetermined range between minimum and maximum sensitivities....
4594512 Ionization type smoke detector  
An ionization type smoke detector for fire alarm comprises an inner ionization chamber (a) defined by an inner electrode (6) and an intermediate electrode (8), an outer ionization chamber (b)...
4567368 Bipolar pulsed electron capture detectors  
In operating an ECD in constant current mode, two pulses are implemented either to the same electrode or to separate electrodes, thereby dispersing the space charge sheath near the collector...
4524351 Smoke detector  
In a smoke detector of the type in which smoke is detected in a detection chamber based upon a variation of an ionization current flowing therein or a variation of light beam passing therethrough,...
4511889 Surge protected smoke alarm  
A smoke alarm for responding to alarm conditions using electrical circuitry having a horn coil placed in series with rectifier circuitry. The series connection of the horn coil with the rectifier...
4475390 Smoke detector  
A smoke detector containing at least one smoke measuring chamber which possesses a mounting or socket plate having an upper surface intended to be mounted at the ceiling of a room or other...
4450409 Pressure sensor and leak detector  
A leak detector comprising a housing having an axis on first and second compartments spaced along the axis and hermetically separated by a partition, the first compartment being closed to comprise...
4401979 Electrical controls for ionization smoke detector  
An ionization smoke detector device including means for insuring that adjustment can be made in the triggering potential for the alarm device so that should circumstances change, an operator can...
4384488 Smoke detector  
A smoke detector containing at least one smoke measuring chamber which possesses a mounting or socket plate having an upper surface intended to be mounted at the ceiling of a room or other...
4328424 Ionization detector chamber  
This invention is a smoke detector for giving a warning that a fire is imminent. The detector has an ionization chamber with a central electrode which is covered by insulation except at a...
4308458 Fire detectors utilizing an ionization chamber not subject to condensation of water vapor during variations of temperature  
Condensation of water vapor on a radiation source in a fire detector is prevented by heating the source using the Joule effect. The heat is provided by a resistor embedded in the ceramic support...
4245174 Dual ionization chamber  
In an electronic smoke sensing and alarm device, a dual ionization chamber arrangement comprises a single source of radioactive material and first and second chambers separated by a common...
4238678 Apparatus and a method for detecting and measuring trace gases in air or other gaseous backgrounds  
Method and apparatus for detecting the presence of very small concentrations of certain vapors and gases in air or other gaseous backgrounds. A gas sample is ionized by a source of ionizing...
4227085 Ionization-type particle detector  
An ionization-type particle detector having an insulating base which mounts an inner electrode provided with a source of ionizing radiation which directs a generally conical beam perpendicularly...
4220862 Ionization chamber for a smoke detector having an improved arrangement for capturing airborne combustion products  
An ionization chamber for a smoke detector is disclosed wherein entry of airborne combustion products to the chamber is enhanced by an improved aperture and inlet surface arrangement which is...
4160908 Particulate enhancement for generator condition monitors  
In a hydrogen cooled dynamoelectric machine, an ion chamber detector monitors thermally produced particulates. The sensitivity of the ion chamber detector is improved by incorporating a...
4137453 Methods and apparatus for improving electron capture detectors by collection of ions  
Method and apparatus for the detection of electronegative chemical species in gas flows, such as exist from gas chromatographs, by sampling the detector volume via an aperture connecting to a...
4119851 Apparatus and a method for detecting and measuring trace gases in air or other gas backgrounds  
Method and apparatus for detecting the presence of very small concentrations of certain vapors and gases in air or other gaseous backgrounds. A gas sample is ionized by a source of ionizing...
4101278 Ionization detector utilizing tritiated scandium with an acceptable tritium emanation rate at high temperature  
An ionization detector, such as an electron capture detector for use in pesticide residue analysis, utilizes a scandium tritide beta particle source. The scandium tritide forms a surface portion...
4080535 Generator condition monitor for particulate detection  
In a hydrogen cooled dynamoelectric machine, an ion chamber detector monitors thermally produced particulates. Specificity and sensitivity of the ion chamber detector are improved by applying an...

Matches 1 - 50 out of 159 1 2 3 4 >