Effect of Microwave Signals Incident upon Different Regions of a dc Hydrogen Glow Discharge

Udelson, B. J.

doi:10.1063/1.1722756

Cited by 37 publications

(8 citation statements)

References 2 publications

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“…The incident THz radiation gives rise to a change in current. It was found that the detection mechanism can be enhanced cascade ionization that causes increase of current [5]- [10] when the GDD is exposed to electromagnetic radiation and/or enhanced diffusion current to the glass walls which causes decrease of current [2], [5], [6], [9], [11]. In the first case, effect of the radiation is felt most in the cathode dark space where electron energy is maxima (see Fig.…”

Section: Introductionmentioning

confidence: 98%

THz Polarization Effects on Detection Responsivity of Glow Discharge Detectors (GDDs)

2009

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The detection mechanism of glow discharge plasma in neon indicator lamps has been investigated in the terahertz and microwave spectral regions. The influence of the THz radiation polarization on the responsivity of glow discharge detectors (GDD) is considered here. There are two detection mechanisms in the GDD that exist simultaneously, each at the expense of the other. Experiments with GDD neon indicator lamps in the THz regime prove that the dominant detection mechanism of the GDD is enhanced cascade ionization rather than enhanced diffusion current. Our polarization experiments in the THz regime show that when the electric field of the THz radiation is in the same direction as the DC bias electric field of the lamp, the responsivity is about 50% higher than when the THz electric field is orthogonal to the DC field. This supports the concept that the dominant detection mechanism of the GDD in the THz regime is enhanced cascade ionization.

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Section: Introductionmentioning

confidence: 98%

THz Polarization Effects on Detection Responsivity of Glow Discharge Detectors (GDDs)

2009

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“…Linearity of GDD detection mechanism [4,[8][9] enables the GDD to act as a direct mixer and thus as a heterodyne detector. Heterodyne detection is characterized by high sensitivity performance, and thus very low signals compared to direct detection can be detected.…”

Section: Theory Of Heterodyne Detectionmentioning

confidence: 99%

“…The detection mechanism of the GDD was found to be enhanced cascade ionization rather than enhanced diffusion current [3,4,[8][9][10]. This change of energy is sufficient to convert some excitation collisions of electrons with neutral atoms into ionization collisions, and thus to increase the current density between the electrodes [3].…”

Section: Introductionmentioning

confidence: 99%

Down-conversion detection in 300 GHz radiation using Glow Discharge Detector (GDD)

et al. 2012

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A miniature neon indicator lamp, also known as a Glow Discharge Detector (GDD), costing about 50 cents was found to be an excellent room temperature THz radiation detector. Down conversion detection using the GDD for 300 GHz radiation is demonstrated in this study. Previous results with the GDD at 10 GHz showed 40 times better sensitivity using down conversion detection compared to direct detection. Preliminary results at 300 GHz showed better sensitivity by at least one order of magnitude using down conversion compared to direct detection. This can be improved by increasing reference beam power.In order to realize a down-conversion set up we used two synchronized THz sources based on RF multipliers. The first is a 300 GHz source and the second is a 300 GHz+Δf source, where Δf stands for the frequency difference between the two sources. Using a beam splitter configuration we combine the two frequencies for Δf=20 kHz and directed them to the GDD. Due to the unique detection mechanism of the GDD and its linear response, the difference frequency Δf was detected by the electronics circuits. We anticipate significant improvement in detection performance for higher values of Δf due to lower detector noise at higher frequencies.

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“…The plasma is then illuminated with EM radiation of frequency greater than the plasma frequency so that the incident radiation can be absorbed. At least two mechanisms of detection have been identified, enhanced ionization collision rate [4]- [9] and enhanced diffusion [5], [8], [10]- [12]. The former increases the bias current, while the latter decreases it.…”

Section: Introductionmentioning

confidence: 99%

Calibration Method for MMW Imaging Using Inexpensive Miniature Neon Indicator Lamp Detectors

et al. 2014

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We have developed focal plan array (FPA) imagers based on very inexpensive miniature neon indicator lamp detectors called glow discharged detectors (GDDs). The novelty of this paper is a technique of calibration, which permits reliable imaging with such an inexpensive FPA. GDDs are commercial lamps, which lack uniformity as detectors. The technique developed in this paper cancels out differences in response between the FPA lamps caused by both nonuniformity of the MMW collimated beam, and nonuniformity of the GDDs and other components in the electronic circuit. Utilizing this method in the new imaging system unifies detector response. Results, shown with two types of sensor configurations (8 × 8 and 18× 2 scanner array), indeed show better performances and improvement in visibility of details.

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Effect of Microwave Signals Incident upon Different Regions of a dc Hydrogen Glow Discharge

Cited by 37 publications

References 2 publications

THz Polarization Effects on Detection Responsivity of Glow Discharge Detectors (GDDs)

THz Polarization Effects on Detection Responsivity of Glow Discharge Detectors (GDDs)

Down-conversion detection in 300 GHz radiation using Glow Discharge Detector (GDD)

Calibration Method for MMW Imaging Using Inexpensive Miniature Neon Indicator Lamp Detectors

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