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8944679 |
Electrode member, electron energy analyzer, photoelectron energy analyzer, and temperature measuring apparatus
An electrode member has a plurality of spherical electrode sections wherein the radiuses of the spherical sections are different from each other. The spherical electrode sections are disposed in a... |
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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),... |
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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... |
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6717153 |
Apparatus and methods for monitoring emissions
Ions produced by radioactive gases present in air impact on the sensitivity of contamination measuring instruments which detect ions generated by radioactive materials present on an item. Methods... |
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6292105 |
Thermal ionization detector
An ionization chamber that detects changes in temperature of electrical insulation with a corresponding change in voltage. This voltage change can be relayed through an operational amplifier and a... |
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6153884 |
Radioisotope proximity sensor
A radioisotope proximity sensor is provided for detecting proximity or distance to a nearby object containing a small radiation source complementary to the sensor. The output of the sensor is... |
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6057774 |
Smoke alarm with anti-dust screen
Smoke alarms that incorporate dust repelling screens exhibit improved performance with fewer false alarms. Effective screens include conductive strands combined with non-conductive elements. |
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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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5879947 |
Apparatus and method for detecting DMAH using particle sensing detector
A method for detecting dimethylaluminumhydride (DMAH) comprises sensing the aluminum oxide particles produced by the reaction of the DMAH with air (or with a small amount of oxygen). This is... |
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5856784 |
Low profile ionization chamber
A very low profile ionization chamber provides increased operating current by using alpha particle emitting isotopes having low emission energies as an ionization source. The chamber includes a... |
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5804828 |
Method and apparatus for optimizing the sensitivity and linearity of an electron capture detector
Electron capture detector for use with an effluent stream from a gas chromatograph includes an ionization cell and a sample inlet system connected to the ionization cell for providing an effluent... |
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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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5485144 |
Compensated ionization sensor
A compensated ionization-type sensor includes spaced apart active and reference electrodes. A center electrode is disposed between the active reference electrodes. A compensating electrode is... |
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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,... |
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5347139 |
Dual energy tracer quantitative analysis
Using storage phosphor recording media, two exposures are made of a sample containing two target substances tagged with different radiative emitters, for example 32-P and 35-S. The first exposure,... |
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5317159 |
Method of using an electron capture type detector
An electron capture type detector for gas chromatography has an ionization vessel containing therein line sources for a radioactive isotope serving as a negative electrode, a collector electrode,... |
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5243330 |
Fire detector system and method
A fire detector system including ionization smoke detectors (7) is provided with improved false-alarm protection. The system includes an ionization chamber (1) with a radioactive source (10),... |
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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... |
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5212470 |
Supervised fire alarm system
A fire alarm system having increased immunity to false alarms comprises control and indicating means (6) and a plurality of ionization smoke detectors (7) connected through signal lines (8, 9, 14)... |
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5160916 |
Ionization type smoke sensor
An ionization-type smoke sensor having a 2-chamber 1-radiation source structure including an inner electrode having a radiation source, an intermediate electrode having an opening through which... |
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4868546 |
Radon detector
A portable electronic instrument for detecting radon gas is provided by this invention. The presence of radon gas may be reliably and quantitatively measured with simple and inexpensive... |
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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,... |
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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... |
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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... |
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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... |
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4755682 |
Ionization monitor with improved ultra-high megohm resistor
An ionization monitor measures extremely small currents using a resistor containing a beta emitter to generate ion-pairs which are collected as current when the device is used as a feedback... |
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4740703 |
Ionization-type smoke detector
In an ionization-type smoke detector wherein inner, intermediate and outer electrodes are supported on an insulating base, an inner ionization chamber and an outer ionization chamber being... |
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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... |
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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... |
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4684807 |
Flow contoured electron capture detector cell
A small volume electron capture detector has a cylindrical cell 120 inside which there is provided a generally funnel-shaped insert structure 130 having a cup-shaped section and a cylindrical... |
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4667106 |
Fire identification and discrimination method and apparatus
In a method and apparatus for determining the fuel of a fire, an ionization detector is positioned to detect the ionization level in the fire gases. The natural logarithm of the ratio of the... |
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4651008 |
Sample inlet system for an electron capture detector
An electron capture detector for use with a capillary column is provided with a sample inlet comprising a tubular anode through which sample molecules and a make-up gas are introduced into the... |
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4631412 |
Ionization smoke detector
In a smoke detector of the ionization type having inner, auxiliary and outer electrodes providing inner and outer ionization chambers disposed one within the other, the electrodes and the... |
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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... |
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4600314 |
Smoke detector cutoff timer
A mountable remote cutoff timer for a smoke detector that is powered by a battery and includes a timer that is operatively connected to the battery, a light emitting device for indicating improper... |
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4564762 |
Smoke detector
An ionization detector unit for use in a smoke detector includes a housing wall enclosing an ionization chamber, the wall having openings for passage of air through the chamber, the frontal... |
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4513202 |
Self compensating fire detection device
A device employing ionization principles for fire detection disclosing a configuration which allows compensation for adverse effects due to the flow of the gas through the device or due to the... |
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4488044 |
Ionization chamber for smoke detector and the like
An ionization smoke detector is disclosed in which an electric field is established in an ionization chamber which includes an outer cup-shaped electrode defining the chamber and having side wall... |
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4471346 |
Smoke detector
A portable, battery powered smoke detector in which the operative components are compactly and efficiently arranged in such a manner that they may be housed in a pocket-sized casing approximating... |
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4469953 |
Combination ionization and photoelectric smoke detector
A combination type smoke detector comprising a light scattering smoke detector and an ionization smoke detector in which a labyrinth structure dark chamber for the light scattering smoke detector... |
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4456907 |
Ionization type smoke detector with test circuit
An ionization detector of the type having a housing with electrodes and a radiation source for causing ion current flow between the electrodes, collector means for detecting, by a change in... |
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4455553 |
Smoke detector of the ionization type
An ionization type smoke detector (10) includes a chamber having a measuring electrode (12), the voltage on the measuring electrode being a function of the concentration of smoke in the chamber,... |
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4445038 |
Apparatus for simultaneous detection of positive and negative ions in ion mobility spectrometry
An ion mobility detector has dual drift regions respectively on either side of a centrally located reaction region and respectively separated therefrom by dual shutter grids. Each drift region... |
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4439683 |
Ionization smoke detector
An ionization smoke detector having a sensing chamber and including: a screen or mesh electrode enclosing and forming the outer limits of said sensing chamber, while fully exposing said sensing... |
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4423411 |
Ionization type fire detector
A single chamber ionization-type fire detector. The ionization current is directly amplified to provide a usable analogue signal by means of an operational amplifier which has a minimal effect in... |
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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... |
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4396840 |
Ionization type smoke sensing device
An ionization type smoke sensing device includes a printed board. An inner electrode made of heat-resistant metal is attached to the printed board and a radioactive source is fixed to the inner... |
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4383253 |
Ionization smoke detector
The detector comprises a first electrode defined by a bolt mounted on an annular insulator which in turn is mounted on a printed circuit board and a second electrode defined by a cup shaped member... |
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4379290 |
Alarm device with a condition sensor element
In an alarm installation containing a central evaluation unit and alarm devices arranged remotely therefrom, the transmission of energy from a radiation source and the reporting back of the signal... |
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4364031 |
Ionization smoke detector with increased operational reliability
An ionization smoke detector containing at least one ionization chamber operated at an extra low voltage or potential. The ionization chamber contains a sensor employing a measuring electrode and... |