NBS Technical NoteU.S. Government Printing Office, 1981 |
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Page 2
... signal generator that could provide electrical pulses up to 2 A and as short as 20 ns . The circuit is shown in Fig . 1. The diode pro- vides protection for the LED in case of a strong , negative reflection . The series resistor ...
... signal generator that could provide electrical pulses up to 2 A and as short as 20 ns . The circuit is shown in Fig . 1. The diode pro- vides protection for the LED in case of a strong , negative reflection . The series resistor ...
Page 7
... signal - to - noise ratio no better than 3 or 5. In part to reduce the effect of this noise , we record our waveforms with the xy recorder instead of the more - common oscilloscope photography . By scanning sufficiently slowly and ...
... signal - to - noise ratio no better than 3 or 5. In part to reduce the effect of this noise , we record our waveforms with the xy recorder instead of the more - common oscilloscope photography . By scanning sufficiently slowly and ...
Page 1
... signal - to - noise ratio are discussed . Measurements utiliz- ing radiation patterns are covered ; this includes radiation angle ( numerical aperture ) , attenuation using mode filters , index profile , core diameter , and mode volume ...
... signal - to - noise ratio are discussed . Measurements utiliz- ing radiation patterns are covered ; this includes radiation angle ( numerical aperture ) , attenuation using mode filters , index profile , core diameter , and mode volume ...
Page 8
... signal - to - noise over narrowband filters . Angles of incidence on the filter are so small that angular dependent transmission effects are avoided . The launch lens produces a demagnified image of aperture 1 on the fiber end ; a ...
... signal - to - noise over narrowband filters . Angles of incidence on the filter are so small that angular dependent transmission effects are avoided . The launch lens produces a demagnified image of aperture 1 on the fiber end ; a ...
Page 10
... signal for narrowband , phase sensitive detection with a lock - in amplifier . 3.2 Detector The far field may be scanned by a number of different techniques : ( 1 ) fixed fiber end , rotating detector , ( 2 ) fixed detector , rotating ...
... signal for narrowband , phase sensitive detection with a lock - in amplifier . 3.2 Detector The far field may be scanned by a number of different techniques : ( 1 ) fixed fiber end , rotating detector , ( 2 ) fixed detector , rotating ...
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Common terms and phrases
antenna attenuation Backscatter response backscatter signal backscatter signature beam beam divergence Bureau of Standards C3Hg calculated calibration capture fractions components coupling loss dBV/m densimeter DEPARTMENT OF COMMERCE detector diameter diode dipole electric field electronic engineering equation experimental far-field fault signature Federal field distortion due field intensity field strength Figure frequency function graded-index fiber Haynes Hiza IEEE Trans index fibers input instrument isotropic Laboratory laser laser diode leaky modes lens logarithmic Magnetic field distortion measurement metering unit methane microbending MIXTURE mode filter mole fraction N₂ National Bureau near-field numerical aperture optical fiber OTDR output parameters peak percent perfectly conducting cylinder potentiometer pulse radiation angle radiation monitor range Rayleigh scattering Report Resistor scan Science sensor step-index fiber switch Table Tech technical Technology temperature transverse electromagnetic cell U.S. DEPARTMENT voltage waveguide wavelength ZERO
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Page 99 - NONPERIODICALS Monographs — Major contributions to the technical literature on various subjects related to the Bureau's scientific and technical activities. Handbooks — Recommended codes of engineering and industrial practice (including safety codes) developed in cooperation with interested industries, professional organizations, and regulatory bodies.
Page 99 - DC 20056. Building Science Series — Disseminates technical information developed at the Bureau on building materials, components, systems, and whole structures. The series presents research results, test...
Page 45 - A special series of interim or final reports on work performed by NBS for outside sponsors (both government and non-government). In general, initial distribution is handled by the sponsor; public distribution is by the National Technical Information Services (Springfield, Va.
Page 48 - ... public safety. The Bureau's technical work is performed by the National Measurement Laboratory, the National Engineering Laboratory, and the Institute for Computer Sciences and Technology. THE...
Page 45 - Mathematics Series — Mathematical tables, manuals, and studies of special interest to physicists, engineers, chemists, biologists, mathematicians, computer programmers, and others engaged in scientific and technical work. National Standard Reference Data Series — Provides quantitative data on the physical and chemical properties of materials, compiled from the world's literature and critically evaluated.