Author/Authors :
P.N.، Dmitriev, نويسنده , , L.V.، Filippenko, نويسنده , , A.B.، Ermakov, نويسنده , , S.V.، Shitov, نويسنده , , V.P.، Koshelets, نويسنده , , V.V.، Khodos, نويسنده , , V.L.، Vaks, نويسنده , , P.A.، Yagoubov, نويسنده , , W.-J.، Vreeling, نويسنده , , P.R.، Wesselius, نويسنده ,
Abstract :
A submillimeter heterodyne spectrometer employing a superconducting local oscillator is demonstrated for the first time. The sensor chip comprises a quasioptical double-dipole lens-antenna SIS mixer (T/sub RX/=250 K at 380 GHz), a Josephson flux-flow oscillator and a SIS harmonic mixer. Room temperature PLL electronics is used with a reference source at 10 GHz. The PLL bandwidth of 10 MHz and the hold range of 3 GHz are estimated for locking at 32-th harmonic of the reference source. The spectral resolution better than 1 MHz and broadening effect of a spectral line of SO/sub 2/ gas at 326867 MHz are measured with a laboratory gas cell at 300 K at pressure 0.03 - 0.3 mbar using acousto-optical spectrometer.
Keywords :
homocysteine , Ischaemic heart disease , Cretan Mediterranean diet , folate
