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7875867 |
Non-ambipolar radio-frequency plasma electron source and systems and methods for generating electron beams
An electron generating device extracts electrons, through an electron sheath, from plasma produced using RF fields. The electron sheath is located near a grounded ring at one end of a negatively...
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7863571 |
Muon detector
An economical position-sensing muon detector for muon radiography is constructed using a pair of glass plates spaced apart by crossed parallel barriers. Smaller detector wires are interspersed...
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7701578 |
Planar micro-discharge gas detector
A micro-sized gas detecting device with two electrodes separated by a gap of width ranging from 1 to 500 microns, where the detection is based on emission spectroscopy of gases in an electric...
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7549803 |
Fiber optic generator condition monitor
A condition monitoring system for use in monitoring a generator. The condition monitoring system includes a sensor including an ion chamber located inside the generator for sensing particulates...
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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...
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7271395 |
Device and method for the measurement of depth of interaction using co-planar electrodes
A device and method for measuring a depth of interaction of an ionizing event and improving resolution of a co-planar grid sensor (CPG) are provided. A time-of-occurrence is measured using a...
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7196325 |
Glow discharge and photoionizaiton source
A detector that may contain a glow discharge ionizer and a photo-ionizer. The existence of both ionizers may increase the accuracy and number of chemical compounds that can be simultaneously...
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7186986 |
Radiation detector with converters
A high efficiency radiation detector employs longitudinally extending converter elements receiving longitudinally propagating radiation to produce high-energetic electrons received by detector...
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7180076 |
Photoionization detectors, ionization chambers for use in photoionization detectors, and methods of use of photoionization detectors
A photoionization detector includes a housing, electrical contacts within the housing and an easily removable and replaceable photoionization chamber within the housing. The photoionization chamber...
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7180070 |
Radiation detector
A radiation detector for imaging a sheet-shaped beam (11) of ionizing radiation comprises an electron multiplication chamber (12) filled with a medium for electron multiplication; and a solid...
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7135688 |
Apparatus and method for the detection of the energy of ionizing electro-magnetic radiation
A spectrometer system employs a gridless Xenon detector having an anode and a cathode supported in spaced relation from the anode devoid of structure intermediate the anode and cathode. Pulses...
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7134761 |
Arrangement and a method for emitting light
An arrangement for emitting light includes a hermetically sealed casing with a window, a layer of a fluorescent substance arranged within the casing covering at least a major part of the window, an...
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7105831 |
Ambient air alpha particles ionization detector
An ionized alpha particle detector to directly measure alpha activity in ambient air that counts alpha pulses instead of measuring radon concentration is provided by an open-air ionization chamber,...
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7071674 |
Micro-electrometer
A voltmeter for measuring atmospheric or other voltages eliminates the dead band without application of high voltages or radioactive isotopes to increase conductivity in the region of the probe. A...
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6967485 |
Automatic drive adjustment of ultraviolet lamps in photo-ionization detectors
A photo-ionization detector having an adjustable drive power for a UV lamp implements a calibration operation that determines measurement signals for a series of drive power levels and based on the...
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6940074 |
Devices incorporating soft ionization membrane
Devices are disclosed that incorporate an ionization device for generating ions and electrons having first and second conductive electrodes that are separated by less than the mean-free-path of...
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6865896 |
Storage unit and refrigerator
The cool air inside a refrigerator compartment 2 is introduced through a return opening 10 into an ion generation chamber 45 provided behind the refrigerator compartment 2. A voltage is applied to...
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6765198 |
Enhancements to ion mobility spectrometers
An ion trap mobility spectrometer is provided. The ion trap mobility spectrometer employs algorithms to simultaneously detect and analyze both positive and negative plasmagrams. Selectivity is...
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6646444 |
Plug-in photoionization sensor
A sensor for detecting volatile organic compounds in ambient air by positioning a detection cell adjacent a gas discharge device to cause molecules of organic compounds to become ionized, and...
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6630664 |
Atmospheric pressure photoionizer for mass spectrometry
A monitor that can detect a trace molecule that is ionized at approximately one atmosphere. The molecule is ionized with a photoionizer and detected by a detector. The monitor may include a number...
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6627878 |
(Chemical agent) point detection system (IPDS) employing dual ion mobility spectrometers
A system for sampling the ambient air of a selected environment for the presence of unwanted chemical vapors, such as nerve or blister gases includes an external air sampling unit and a detector...
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6486468 |
High resolution, high pressure xenon gamma ray spectroscopy using primary and stimulated light emission
A design and readout of a xenon detection medium based device, which provides improved spectroscopic performance compared to currently commercially available devices. To achieve energy resolution...
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6456681 |
Neutron flux measuring apparatus
A neutron flux measuring apparatus, adapted to a boiling-water reactor (BWR) of a nuclear power plant and an advanced boiling-water reactor (ABWR) of a nuclear power plant, for measuring a neutron...
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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...
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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...
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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...
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5981952 |
Dynamic focusing apparatus for cathode-ray tube device
A dynamic focusing apparatus is comprised of a parabaolic voltage generating device for generating a parabolic voltage VpbI across a capacitor 9M by applying a horizontal flyback pulse a series...
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5925823 |
Alpha-particle gas-pressure sensor
Gas pressure in a chamber is determined by injecting alpha particles. The alpha particles ionize the gas. By determining a number of gas ions which are ionized, the pressure of the gas in the...
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5923172 |
Penning type gauge head with ignition aid
A penning type gauge head with an electrode system comprising an anode and a cathode disposed in the magnetic field of a permanent magnet, including an ignition aid for the electrode system. In...
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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...
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5877502 |
Radiation monitor for liquids
A radiation monitor for use with liquids that utilizes air ions created by alpha radiation emitted by the liquids as its detectable element. A signal plane, held at an electrical potential with...
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5861629 |
Method of and device for the quantitative detection of material in a sample
Method of quantitatively detecting material in a sample, whereby the material is in the form of submicrometric particles covered by a photoemitting substance, and a device for practicing the...
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5855850 |
Micromachined photoionization detector
A photoionization detector includes a brittle substrate having a void micromachined therein with a void inlet and a void outlet. First and second electrodes are disposed in the void. An ultraviolet...
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5773833 |
Photo-ionization detector for volatile gas measurement
A photo-ionization detector (PID) which measures volatile organic gas uses electrically insulated parallel plates to energize a miniaturized gas discharge UV lamp and an energy efficient method to...
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5739699 |
Method and apparatus for ion discrimination in an electron capture detector
Electron capture detector for use with an effluent stream from a gas chromatograph includes an electron source means and an adjacent ionization chamber in which electron capture takes place. The...
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5731585 |
Voigt filter
A Voigt optical filter. Crossed polarizers are provided at the entrance and exit of a vapor cell continuing an alkali metal vapor. A magnet provides a magnetic field at 90° with the axis of the ...
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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...
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5663567 |
Apparatus for detecting alpha radiation in difficult access areas
An electrostatic alpha radiation detector for measuring alpha radiation emitted from inside an enclosure comprising an electrically conductive expandable electrode for insertion into the enclosure....
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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...
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5572137 |
Portable device for detecting UV light ionizable gas or vapor
An improved ionizable gas or vapor detector device and method are provided which are capable in preferred forms of sampling 4×10-3 cubic meters or more of air sec-1 and are responsive to ionizable ...
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5561344 |
Photo-ionization detector for detecting volatile organic gases
A photo-ionization detector utilizes an ultraviolet (UV) lamp and is designed for detecting and measuring the concentration of volatile gases flowing between closely spaced parallel electrodes. One...
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5550381 |
Event counting alpha detector
An electrostatic detector for atmospheric radon or other weak sources of alpha radiation. In one embodiment, nested enclosures are insulated from one another, open at the top, and have a high...
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5543331 |
Method of detection of alien matter contents in gases
The objective of the invention is a method for detection of alien matter contents in gas, in which method the gas and the substances contained in it are ionized in an ionization room (1). By the...
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5479022 |
Electron capture detector with guard electrode
An improved ECD employing an ECD cell having a third electrode, i.e. guard positioned between the ECD cell field electrodes. The guard electrode is physically interposed between said field...
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5431714 |
Process for investigating particles situated in a gas
In the process for investigating particles situated in a gas, a gas stream is guided past a miniaturized UV excimer radiator. In this case, the particles are ionized and subsequently filtered out,...
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5220284 |
Method and device for measuring the concentration of particles in a gas by ionization of the particles
In a method and a device for measuring the concentration of particles present in a gas, in which a gas stream is guided past a UV light source, the particles are ionized and filtered out and the...
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5200614 |
Ion mobility spectrometers
An ion mobility spectrometer is provided which employs an electron capture process. A sample gas stream is irradiated to produce positive ions and electrons in an ionization chamber. An open grid...
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5198772 |
Removable discharge initiating means for cold cathode discharge ionization gauge
A cold cathode gauge including a glow lamp or the like disposed within the vacuum space of the gauge for initiating the gauge discharge, the lamp emitting UV or blue light directly at at least the...
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5194737 |
Single and double grid long-range alpha detectors
Alpha particle detectors capable of detecting alpha radiation from distant sources. In one embodiment, a voltage is generated in a single electrically conductive grid while a fan draws air...
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5113421 |
Method and apparatus for measuring the thickness of a coating on a substrate
A method and apparatus for measuring simultaneously the thickness and the composition of a coating on a metal substrate. A first beam of radiation that produces a primary beam of photons is...
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