CONTROL OF X-RAY DIFFRACTED AND X-RAY FLUORESCENCE BEAMS (TRANSMISSION OF SPEECH). Navasardian M.A., Gabrielian R. Ts., Mkrtchian V.P.; Physics Department of Yerevan State University, Al. Manoukian 1, Yerevan 375049, Armenia

The double modulation of X-ray beam for the purpose of transmission of signals [1] was a new step in X-ray diffraction studies. In investigations that followed two important results were obtained: under temperature gradient a pumping of primary beam energy into the direction of reflection [2] was observed, and a transmission (reception) of information, in particular of speech was realized by the Laue-diffracted beams [3].

In the present work the double modulation of X-rays at different values of wavelengths of X-rays, at different powers of X-ray tubes, and at different thickness of crystalline plate (0.15 ( ut (10) as well as the modulation of X-ray fluorescent radiation for different atoms has been investigated.

The following results were obtained:

1. At double modulation both by anomalous transmitting beams (Ga(220), ut ( 10) and by diffracted beam in the direction of incidence (at ut ( 1), the transmission of vocal signals (speech) is impossible. This is due to the fact that the intensity I of these beams decrease as the amplitude of electrical (acoustic) oscillations U applied to the modulator are increased. That is, I(U) is a decreasing function, while for proper operation of transmission systems I(U) should be an increasing function.

2. The double modulation of beams from low power sources (8W) will permit to use X-ray tubes without the cooling of anode.

3. Using the modulated X-ray beam we have obtained low-frequency (speech) echo from deep energy levels of the atom. At the excitation by Mo K[[alpha]] radiation 30 atoms with different Z were used, the energies of K or L absorption edges were less than the energy of photons of K[[alpha]] line of Molybdenum.

4. It will be submitted the improved scheme of the equipment for the transmission and reception of information by double modulated X-rays.

1. Navasardian M.A., Nazarian U.N., Mirzoian V.K. Izv. AN Arm SSR, Fizika, v.14.n.4. P.425.1979.

2. Mkrtchian A.R., Navasardian M.A., Mirzoian V.K. Pis'ma ZhTF.v.8.677.1982

3. Mkrtchian A.R., Navasardian M.A., Mirzoian V.K., etc. Author's certificates, USSR, N#1327216, 1.04.1987