摘要:
A method and apparatus for background correction in photoluminescent analysis of a selected photoluminescent target substance with a relatively narrow emission spectrum in the presence of ambient substances with a combined photoluminescent spectrum which is relatively broad. The photoluminescence of the target substance is sampled and measured in a narrow wavelength band corresponding to the principal emission spectrum of the target. A second sample of photoluminescence is measured in one or more wavelength bands adjacent to the first wavelength band, but excluding substantially all of the photoluminescence of the target substance, and transmitting only ambient photoluminescence. The second measurement is converted into an amount which would occur if ambient photoluminescence had been sampled in the first wavelength band and then the converted amount is subtracted from the first measured amount, thereby correcting the first measured amount for photoluminescence derived from ambient substances.
摘要:
Photovoltaic device comprising a conventional photovoltaic cell and a series of thin layers successively applied on the photocell surface, said layers being of different compositions and selected in such a manner that the light energy in a spectrum zone, falling on the outermost layer, may be transferred successively in cascade, through the intermediary of the various layers, up to the spectral sensitivity zone of the photovoltaic cell.
摘要:
A portable fluorescence-based spotter for polynuclear aromatic hydrocarbon contamination on personnel and work area surfaces under ambient lighting conditions is provided. This instrument employs beam modulation and phase sensitive detection for discriminating between fluorescence from organic materials from reflected background light and inorganic fluorescent material. The device uses excitation and emission filters to provide differentiation between classes of aromatic organic compounds. Certain inorganic fluorescent materials, including heavy metal compounds, may also be distinguished from the organic compounds, despite both having similar optical properties.
摘要:
A DYE LASER UTILIZING AN ACTIVE MATERIAL COMPRISING A DYE SELECTED FROM THE GROUP CONSISTING OF RHODAMINE 6G, RHODAMINE S, RHODAMINE B, ACRIDINE RED, KITON RED S AND URANINE IN SOLUTION WITH THE TRIPLET STATE QUENCHER CYCLOOCTATERTRAENE. THE RESULTANT SOLUTION PROVIDES A DYE LASER HAVING RELATIVELY LONG HIGH ENERGY OUTPUT PULSES.
摘要:
Vertical reflection type fluorescence microphotometer in which a specimen under examination is irradiated with an ultraviolet ray directed onto the upper surface of the specimen and light reflected back from the specimen is measured by means of a photoelectric tube. The fluorescence microphotometer comprises a light source for emitting an exciting light, a lens for forming an image of the light source at a position where an aperture diaphragm is located, a relay lens for forming an image of the aperture diaphragm through a dichroic mirror in a focal point located at the image side of an objective lens, and a pinhole arranged between the relay lens and the dichroic mirror. The objective lens can form an image of the pinhole on the upper surface of the specimen as well as an image of the fluorescence emitting position of the specimen through the dichroic mirror at a position where a diaphragm is located. The fluorescence transmitted through the diaphragm is received by the photoelectric tube.
摘要:
An illuminating arrangement is disclosed which, in one particular embodiment, includes a pair of optically-alignable ''''sight markings'''', the markings being illuminated and defined, at least in part, by a ''''radio-luminescent'''' segment, especially suited for a dimly-lit field of view, these segments including a phosphorescent material and a ''''matched'''' radio-isotope adapted to induce prescribed phosphorescence.
摘要:
The invention relates to light sources and, in particular, to light sources for use in navigational aids such as lighthouses and lighted buoys.In more detail, the light source of the present invention comprises a radio isotope fuel source, thermal insulation against heat loss, a biological shield against the escape of ionizing radiation, a material having a surface which attains incandescence when subject to isotope decay heat and means for transferring energy from the insulated fuel source to produce incandescence of the surface and thereby emit light.
摘要:
A new scintillator composition, consisting essentially of di-m-methylphenyl-1,3,4-oxadiazole, or 2,5-di-m-tolyl-1,3,4-oxadiazole, is prepared by reacting m-toluoyl chloride with hydrazine to form di-m-toluoyl hydrazine which, in turn, is reacted with thionyl chloride to form the desired product which is dissolved in an organic solvent. The scintillator, di-m-methylphenyloxadiazole compares favorably with present commercial products, being equal to or better than diphenyloxazole in most important respects and significantly superior in scintillation pulse height and in stability. It can be produced at a fraction of the cost of today's most widely used product.
摘要:
A DYE LASER UTILIZING AN ACTIVE MATERIAL COMPRISING THE DYE RHODAMINE 6G IN SOLUTION WITH THE TRIPLET STATE QUENCHER CYCLOHEPTATRIENE. THE RESULTANT SOLUTION PROVIDES A DYE LASER HAVING RELATIVELY LONG HIGH ENERGY OUTPUT PULSES.
摘要:
A SCINTILLATOR COMPOSITION FOR LIQUID SCINTILLATION COUNTING AND DETECTION OF THERMAL NEUTRONS COMPRISING (1) A SCINTILLATION SOLUTE AND AN ETHOXYLATED ALKYL PHENOL, AND (2) A LOADING AGENT COMPRISED OF AN AQUEOUS SOLUTION OF A COMPOUND OF AN ELEMENT HAVING HIGH THERMAL-NEUTRON-CAPTURE EFFICIENCY, SAID ELEMENT INTERACTING WITH SUCH NEUTRONS RESULTING IN THE PRODUCTION OF AN EXO-ERGIC NUCLEAR REACTION.