GLOW DISCHARGE DETECTORS (GDDS) FOR MILLIMETER-WAVE RADIATION DETECTION AND IMAGING

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Tezin Türü: Yüksek Lisans

Tezin Yürütüldüğü Kurum: Orta Doğu Teknik Üniversitesi, Fen Bilimleri Enstitüsü, Fen Bilimleri Enstitüsü, Türkiye

Tezin Onay Tarihi: 2018

Öğrenci: Namıg Alasgarzade

Asıl Danışman (Eş Danışmanlı Tezler İçin): İLKER ÜMİT UZUN KAYMAK

Özet:

Commercially available indicator lamps, also known as Glow Discharge Detectors (GDDs), are employed for the purpose of millimeter wave radiation detection and imaging. Previous studies show that dominant radiation detection mechanism for GDDs is enhanced cascade ionization. The current-voltage characteristics of GDDs are obtained and working mode is found as abnormal glow mode. The plasma parameters such as electron temperature and gas composition inside GDDs are studied using Optical Emission Spectroscopy method. In order to employ a GDD as a pixel detector, a read-out electronics with an amplifier circuit is developed. This circuit is used to measure the changes in current of the plasma discharge. The detection performance of two different GDDs, namely N520A and N523, are tested at 82 GHz and 100 GHz radiation frequencies. The response of GDDs is found highly sensitive to the discharge current and polarization of the incident millimeter wave radiation. A continuous-wave imaging system is constructed using the GDD as a detector. The images are obtained at 82 GHz, 100 GHz and 119 GHz radiation frequencies.