PT Journal
AU Gershenzon, EM
   Gol'tsman, GN
   Mirskii, GI
TI Submillimeter backward-wave-tube spectrometer-relaxometer
SO Pribory i Tekhnika Eksperimenta
JI Pribory i Tekhnika Eksperimenta
PY 1987
BP 131
EP 137
VL 30
IS 4
LA Russian
DE BWO; applications
AB A backward-wave-tube (BWT) spectrometer-relaxometer is described that is designed for study of the relaxation characteristics of photoconductors in the wavelength range of 2-0.25 mm - in particular, to measure the relaxation times of the submillimeter photoconductivity of germanium in the range of 10[sup:-4]-10[sup:-9] sec and to determine from these data the concentration of compensating impurities of from 10[sup:10] to 10[sup:14] cm[sup:-3]. The instrument uses the beats of the oscillations of two BWTs and records the amplitude-frequency response of the specimen with variation of the beat frequency from 10[sup:4] to 10[sup:8] Hz with accumulation of the desired signal for less than or equal to1 sec by means of a quadrature synchronous detector. The beat frequency is stabilized and the quadrature voltages of the synchronous detector are formed by means of phase-locked loops.
ER