METHOD FOR DETERMINING INSULATING CHARACTERISTICS OF MATERIALS Russian patent published in 1995 - IPC

FIELD: measurement technology. SUBSTANCE: method involves modulation of monochromatic electromagnetic wave by pulse train of pulse length and repetition rate T_n≥ 5τ₄, where ε is desired design dielectric constant; l is length of specimen; c = 3·10⁸m/s ; T_o is desired period of working frequency, and conversion of electromagnetic monochromatic wave into flat wave, separation of modulated flat wave into two coherent waves, simultaneous transmission of these waves over two channels (reference channel and probing one with specimen under test) measurement of electromagnetic monochromatic wave attenuation Δt in specimen under test, conversion of radio pulses across outputs of both channels into video pulses, measurement of time delay ε_r of probing-channel video pulses in respect to those of reference channel, calculation of dielectric constant σ_o and electric conductivity ε_r= (cΔt/l+1)²-(αλ_o/17,4πl)²; of analyzed specimen material by using formula σ_o= α/521πl·(cΔt/l+1), where λ_o is desired wavelength in free space (λ_o= cT_o).. EFFECT: improved measurement accuracy. 1 dwg