Abstract:
A light source and a method for its use in an optical sensor are provided, the light source including a resistively heated element. The light source includes a power circuit configured to provide a pulse width modulated voltage to the resistively heated element, the pulse width modulated voltage including: a duty cycle with a first voltage; and a pulse period including a period with a second voltage, wherein: the duty cycle, the first voltage, and the pulse period are selected so that the resistively heated element is heated to a first temperature; and the first temperature is selected to emit black body radiation in a continuum spectral range. Also provided is an optical sensor for determining a chemical composition including a light source as above.
Abstract:
An apparatus for radiometric measurement of thin fluid films includes a housing (1) enclosing means of radiation, a radiation guide, a reflector (4) and one or more detectors (5). The means of radiation is normally an IR radiator (2). The radiation guide is either a radiation tube (3) or a radiation cone (7). The reflector (4) is of the type non-imagining optics. If there is more than one detector (5) normally at least one detector is a reference detector.
Abstract:
A blackbody radiation device (110) includes a planar filament emission element (102) and a planar detector (104) for respectively producing and detecting radiation having width dl/l less than about 0.1 to test a sample gas, where l is the wavelength of the radiation; a reflector (108); a window (W); an electrical control (118); and a data output element (116).
Abstract:
A blackbody radiation device (110) includes a planar filament emission element (102) and a planar detector (104) for respectively producing and detecting radiation having width dl/l less than about 0.1 to test a sample gas, where l is the wavelength of the radiation; a reflector (108); a window (W); an electrical control (118); and a data output element (116).
Abstract:
A blackbody radiation device (110) includes a planar filament emission element (102) and a planar detector (104) for respectively producing and detecting radiation having width dl/l less than about 0.1 to test a sample gas, where l is the wavelength of the radiation; a reflector (108); a window (W); an electrical control (118); and a data output element (116).
Abstract:
Crime scene lighting devices are used in forensic criminology for illumination and investigation at crime scenes using fluorescence excitation. High radiation powers are required both for white light in the so-called general search and for the criminologically relevant UVA-blue-green range. Moreover, it should be possible for the crime scene investigator to use the forensic lighting device portably and independent from the public power supply. The present disclosure relates to a suitable crime scene light device with a mercury ultra high pressure lamp as the light source, a light guide and terminals for operating the lamp selectively with an accumulator or the public power supply system. A suitable carrier bag, a so-called lorgnette with various longpass filters and a cross-section converter for visualizing shoeprints form useful accessories of the forensic lighting device.
Abstract:
Portable battery-operated ambient air analyzer comprising an electrically-energized incandescent source of infra-red radiation producing a beam passing through an air sample to a sensor. The infra-red source is surrounded by an explosion-proof enclosure to prevent an explosion internally of the enclosure being propagated out to the atmosphere. The incandescent source is a self-supporting filamentary coil having no interior core or mandrel. The coil is formed of a metal composition including aluminum, chromium and iron, operated at a temperature of less than 1000.degree. C.
Abstract:
A portable battery-operated ambient air analyzer comprising an electrically-energized incandescent source of infra-red radiation producing a beam passing through an air sample to a sensor. The infra-red source is surrounded by an explosion-proof enclosure to prevent an explosion internally of the enclosure being propagated out to the atmosphere. The incandescent source is a self-supporting filamentary coil having no interior core or mandrel. The coil is formed of a metal composition including aluminum, chromium and iron.
Abstract:
Es wird eine Infrarot-Lichtquelle angegeben, umfassend ein Substrat, das wenigstens eine einkristalline Siliziumschicht aufweist und das in einem Teilbereich eine Membran aufweist, wobei die Dicke der Membran weniger als 200 μm beträgt und wobei die Membran einen Teil der einkristallinen Siliziumschicht umfasst, wobei das Substrat wenigstens eine Diffusionssperrschicht zur Verminderung der Oxidation der einkristallinen Siliziumschicht aufweist, wobei die Diffusionssperrschicht wenigstens die Membran bedeckt, wobei die Infrarot-Lichtquelle weiterhin eine auf der Membran angeordnete Deck-Schicht umfasst, die eine Emissivität von wenigstens 0,85 aufweist.
Abstract:
Eine Infrarotstrahleranordnung für ein Gasanalysengerät besteht aus einem Strahlergehäuse, in dessen einseitig mit einem strahlungsdurchlässigen Fenster abgeschlossenen Innenraum ein plattenförmiger Keramikkörper (3) angeordnet ist, auf dem eine Heizwiderstandsschicht (4) aufgebracht ist. Um eine sichere und exakt definierte Halterung des Keramikkörpers (3) zu gewährleisten, ist dieser als gleichseitige Dreiecksplatte (5) ausgebildet, die mit ihren Dreiecksspitzen (6) an dem Innenumfang des Strahlergehäuses (1), vorzugsweise in einer Umlaufnut (7), gehalten ist.