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  • INSTRUMENTATION AND PHOTOGRAPHY  (7)
  • 1
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    Far ultraviolet spectral radiance calibrations at NBS. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The range of NBS radiometric calibration services has been extended into the far ultraviolet region of the spectrum where a dc high-power hydrogen wall-stabilized arc is used as a primary standard of spectral radiance. A capability in the range from 130 to 360 nm (overlapping conventional tungsten strip lamp radiometry) is presently available with estimated uncertainties between 5 and 10%, depending upon wavelength. The status of radiometric source standards in the far ultraviolet is briefly reviewed, and the hydrogen arc and NBS calibration facility are described in detail. The use of commercially available mercury Krefft-Rossler lamps and deuterium arc lamps as transfer or secondary standards is discussed, and the spectra of these lamps calibrated with the hydrogen arc standard are presented.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Optical Engineering; 12; May-June
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Spectral radiance calibrations between 165-300 nm - An interlaboratory comparison (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The spectral radiance of deuterium lamps calibrated by the Max-Planck-Institut fuer Astronomie (MPI), by the U.S. National Bureau of Standards (NBS), and by the Physikalisch-Technische Bundesanstalt (PTB) are compared to check the agreement of UV radiometric scales. The NBS group used the optically thin continuum radiation from a wall-stabilized hydrogen arc as its fundamental radiometric standard, while the MPI and PTB groups used the synchrotron radiation facility in DESY. It is found that the spectral radiance scales based upon the DESY synchrotron and the NBS hydrogen arc are consistent, at least for one wavelength relative to another.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics; 16; July 197
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  • 3
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    Vacuum ultraviolet radiometry. III - The argon mini-arc as a new secondary standard of spectral radiance (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: A miniature argon arc has been designed and tested as a new transfer standard of spectral radiance for the wavelength range from 114 nm to 330 nm. Calibration has been performed using two primary standard sources: the hydrogen arc from 130 nm to 330 nm and the blackbody line radiator from 114 nm to 130 nm. The mini-arc provides an intense, stable, and reproducible UV continuum with dc power requirements of less than 1.5 kW. The arc characteristics have been investigated, and the sensitivity of the radiant power output to various operating parameters has been measured. The rms uncertainty in the spectral radiance is estimated to be 5.3% above 140 nm and 10.1% between 114 nm and 140 nm, due primarily to uncertainties in the primary standard sources.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics; 16; Feb. 197
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  • 4
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    Vacuum ultraviolet radiometry with hydrogen arcs. II - The high power arc as an absolute standard of spectral radiance from 124 nm to 360 nm (1975)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics; 14; Sept
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  • 5
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    Vacuum-ultraviolet spectral-irradiance calibrations - Method and applications (1980)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The study deals with a method of calibrating the spectral irradiance of an unknown radiation source based on an existing standard source of spectral radiance. The method is applied to several sources that are being applied as irradiance sources in various experimental situations, e.g., on board the Space Shuttle.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: PB80-221542 , Optics Letters; 5; June 198
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  • 6
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    XUV radiometric standards at NBS (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: The far-UV and XUV detector calibration services at NBS, the properties of the detectors, and the spectrometer calibration facilities at the Synchrotron Ultraviolet Radiation Facility (SURF II) at NBS are described. The method used to calibrate the quantum efficiency of windowless photodiode detectors in the ionization chamber, and the facilities for calibrating photodiodes at various wavelengths are discussed. The cathode and anode of the windowless photodiodes and their operation are examined. Consideration is given to the calculation of spectral irradiance from SURF II; the two stations of the spectrometer facility; the large spectrometer calibration chamber; and sources of error in flux determinations for SURF II.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: X-ray calibration: Techniques, sources, and detectors; Aug. 19, 20, 1986; San Diego, C A; United States
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  • 7
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    Vacuum ultraviolet radiometry with a stabilized hydrogen arc. (1971)
    In:  Other Sources
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    Publication Date: 2019-07-27
    Description: Use of the spectral radiation emitted from a dense hydrogen plasma of at least 12,000 K, which is in local thermodynamic equilibrium (LTE), as a light source for vacuum UV radiometry. Its spectroscopic qualities are exactly known, and except for a few strongly Stark-broadened Lyman lines, its spectrum in the vacuum UV is essentially continuous. The calculated continuum output of this source for typical operating conditions is compared with the UV output of the tungsten strip lamp and the carbon arc.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
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