Abstract:
Apparatus for analyzing the energies of charged particles having an analyzer, a detector and an electrode system. The analyzer generates an electric or magnetic field through which the particles pass, there being an outlet aperture through which the charged particles exit as a beam. The detector is arranged in the path of the beam leaving the analyzer field through the outlet aperture, and the electrode system is arranged between the analyzer and the detector and serves to adjust the cross-section of the particle beam.
Abstract:
A multi-channel photomultiplier tube in which light radiation from distinct sources passes through an entrance window to a photo-cathode, the window being divided into parts so that light from a source passes through a respective part to an associated part of the photo-cathode, the division of the window into parts constraining the light from incidence upon other parts of the photo-cathode.
Abstract:
A method of separating one isotopic species of a given element from a mixture. Collisionless plasma instabilities slow down the ions and oppositely charged electrodes separate the isotopes.
Abstract:
A detachable high-speed optoelectronic sampling head for use with an electron multiplier includes a housing having an evacuated chamber with a pair of transparent windows. Light to be detected is directed to the first window to a photoemissive strip spaced from a ground plane. The photoemissive strip comprises a microstrip, and the housing has high frequency feedthrough means for applying sampling potentials between said photoemissive strip and ground plane. A phosphor layer is provided on the other window in the chamber, and photoelectrons emitted from the photoemissive strip are directed through the ground plane to the phosphor layer.
Abstract:
A microchannel plate for secondary electron emission intensification, having channel walls which are rounded so as to increase the interception of secondary electrons formed due to the incidence of primary electrons on the ends of the said channel walls.According to the invention, the method of manufacturing such a channel plate consists of softening the channel wall material and by bombardment of the glass of the input surface by means of an energy-carrying beam of high power for a very short period of time. The glass of the walls at the input surface side then assumes a rounded shape under the influence of gravity and the surface stress of the glass.
Abstract:
A major surface of a cadmium selenide body is exposed within a reactive sputtering apparatus to controlled bombardment with electrons, and to controlled simultaneous reactive sputter deposition of an overlayer including aluminum and oxygen.
Abstract:
A bialkali photocathode is made by a series of alternate evaporations of antimony, sodium and potassium. The disclosure includes a photocathode made by the method described.
Abstract:
The invention is a chemiluminescent method and apparatus for detecting NOx (NO and NO2), SO2, CO and other gases which react with atomic oxygen to produce chemiluminescence. Atomic oxygen generated by pulse electrical discharge is added at a controlled and known flow rate to a reaction chamber to which is also added at a controlled and known flow rate a gas mixture to be analyzed. The reaction chamber is maintained at a sufficient pressure to support chemiluminescence, normally above about 0.1 Torr and in the range of about 0.5 to 5.0 Torr. Photoelectric means is used to measure the chemiluminescence, and the photoelectric means is synchronized with the pulse discharge so that photoelectric means is turned off during the time of a pulse and for sufficient time thereafter to allow the light generated by the pulse discharge to disappear, whereby the only light the photoelectric means sees is chemiluminescence. The reaction zone and the oxygen generating means are compact and are located adjacent one another to allow miniaturization of the equipment.
Abstract:
A borehole logging probe for mineral or petroleum exploration is disclosed having a californium-252 neutron source for activating elements adjacent to the borehole and a solid state detector for sensing resulting radiation. The probe includes an elongated watertight housing having a shielded compartment for the neutron source, and a thermally insulated compartment for containing the radiation detector. A reservoir is filled with a fusible solid cryogen and located within the insulated compartment adjacent to the detector with a thermal conduction member disposed to cool the radiation detector by transferring heat to the solid cryogen.
Abstract:
An infrared vidicon utilizing a photo-emissive cathode from which the target of the vidicon is scanned to detect infrared radiation in the intermediate infrared region.