摘要: A low-pressure hydrogen discharge lamp has been calibrated for radiant intensity in the vacuum ultraviolet spectral region on an absolute basis and has been employed as a laboratory standard source in spectrograph calibrations. Th... 展开 A low-pressure hydrogen discharge lamp has been calibrated for radiant intensity in the vacuum ultraviolet spectral region on an absolute basis and has been employed as a laboratory standard source in spectrograph calibrations. This calibration was accomplished through the use of a standard photodiode detector obtained from the National Bureau of Standards together with onsite measurements of spectral properties of optical components used. The stability of the light source for use in the calibration of vacuum ultraviolet spectrographs and optical systems has been investigated and found to be amenable to laboratory applica¬tions. The lamp was studied for a range of operating parameters; the results indicate that with appropriate peripheral instrumentation, the light source can be used as a secondary laboratory standard source when operated under preset controlled conditions. Absolute intensity measurements were recorded for the wavelengths 127.7, 158.0, 177.5, and 195.0 nm for a time period of over 1 month, and the measurements were found to be repeatable to within 11 percent. 收起