Showing papers by "Norman S. Kopeika published in 1976"
TL;DR: Extension of abnormal glow discharge detection of electromagnetic radiation to visible wavelengths is observed with inexpensive commercial indicator lamps and spectral response and mechanisms of detection are discussed and advantages over gas-filled photodiodes noted.
Abstract: Extension of abnormal glow discharge detection of electromagnetic radiation to visible wavelengths is observed with inexpensive commercial indicator lamps. The spectral response and mechanisms of detection are discussed and advantages over gas-filled photodiodes noted. Responses from different discharge regions are observed and their implications considered.
34 citations
TL;DR: In this paper, the relationship between glow discharge detector physical and electronic parameters is discussed in terms of physical electronics and an equivalent circuit and a comparison of abnormal and subnormal glow mode properties is made.
Abstract: Commercial indicator lamp glow discharge tubes in the subnormal glow mode exhibit variable frequency tuned filter video response to optical and microwave radiation. Sensitivity to optical radiation can be particularly increased by using such devices in the subnormal rather than abnormal glow. These phenomena are discussed in terms of physical electronics and an equivalent circuit. A comparison is made of abnormal and subnormal glow mode properties. It is hoped that this model can lead to glow discharge lamp design for specific circuit applications involving subnormal glow mode characteristics. Relationships between glow discharge detector physical and electronic parameters are derived.
34 citations
01 Mar 1976
TL;DR: Inexpensive commercial neon lamps are observed not only to sense the presence of low power RF radiation levels, but also to determine the frequency of the incident radiation with relatively good accuracy as mentioned in this paper.
Abstract: Inexpensive commercial neon lamps are observed not only to sense the presence of low-power RF radiation levels, but also to determine the frequency of the incident radiation with relatively good accuracy.
9 citations
01 Mar 1976
TL;DR: Glow discharge detectors in the abnormal glow mode can be used as sensitive detectors of microwave and millimeter wave radiation even in the presence of very intense ionizing radiation fields where semiconductor devices cannot operate as mentioned in this paper.
Abstract: Glow discharge detectors in the abnormal glow mode can be used as sensitive detectors of microwave and millimeter wave radiation even in the presence of very intense γ ionizing radiation fields where semiconductor devices cannot operate. In the subnormal glow mode, glow discharge detectors give promise of being able to monitor ionizing radiation fields so intense that the usual electronic detectors saturate.
8 citations
TL;DR: In this paper, the use of inexpensive commercial discharge indicator tamps to generate relatively high Q tuned filters is demonstrated, and problems deriving from varying specifications of these devices can be partly overcome by using several lamps in series.
Abstract: The use of inexpensive commercial discharge indicator tamps to generate relatively high Q tuned filters is demonstrated. Problems deriving From varying specifications of these devices can be partly overcome by using several lamps in series. In principle, less variation in specifications from lamp to lamp should yield filters with more exact, specifications.
6 citations
4 citations
01 Jul 1976
TL;DR: In this paper, a simple signal processing technique is demonstrated that can be used to recover a demodulated polarization modulation audio signal from the atmospheric modulation noise, which can then be used for the transmission of information over the atmospheric channel.
Abstract: Intesity modulation of optical signals by the atmosphere limits exploitation of the negligible atmospheric depolarization effects as a means of transmitting information over the atmospheric channel. A simple signal processing technique is demonstrated that can be used to recover a demodulated polarization modulation audio signal from the atmospheric modulation noise.
1 citations
TL;DR: Unbiased photodiodes, with appropriate optical filters, should improve such systems considerably if used in place of photomultipliers as discussed by the authors. But this is not the case for all of them.
Abstract: Electronic color sorting machines pose maintenance problems when used for hygroscopic agricultural particles because of the high bias voltages required by photomultipliers. Unbiased photodiodes, with appropriate optical filters, should improve such systems considerably if used in place of photomultipliers.
1 citations