Continuous wave Terahertz spectrometer with coherent detection

Abstract

Abstract. In this paper a continuous wave (cw) spectrometer in the far infrared range covering frequencies between several tens Gigahertz and one Terahertz is presented. The spectrometer employed a coherent detection scheme and therefore measures both the amplitude and phase of THz radiation. First spectroscopic results of Si-wafer and a test Bragg structure are presented.

Selected polymers on CW and pulsed THz investigations

“…2, and to compare it to the distance in frequency obtained for the setup with a sample. The measurements should be performed along all the bandwidth of the pho− tomixer to obtain a continuous spectrum of the refractive index [13,14,16]. The same result is possible to obtain much easier in a pulsed system.…”

Archives of Thermodynamics

“…Since the κ coefficient is equal to the quotient of specific heat at constant pressure c p to specific heat at constant volume, c v , [12], the κ E coefficient for ethylene is…”

“…Flow rate, ṁ, can be calculated treating throttling in the pipeline as from the nozzle flow equation. Because the model assumes flow through a constant diameter pipeline, the flow through the de Laval nozzle was assumed for simplification of calculations, according to the formula [7,12]…”

“…After transforming the above equation according to the scheme of solving differential linear equations [12], we obtain the formula for the mass of ethylene as a function of time…”