ACOUSTIC INSULATOR Russian patent published in 2003 - IPC

FIELD: tools for acoustic logging. SUBSTANCE: in given acoustic insulator alternating elements possessing higher acoustic rigidity are formed by Z-shaped generating lines, are tightly interjoined with overlapping of longitudinal elements, elements having less acoustic rigidity come in the form of bushings placed among lateral conical touching surfaces. Length of longitudinal parts of elements possessing higher acoustic rigidity and length of elements having less acoustic rigidity are chosen from relation λ, where n is integral number from series 1, 2, 3,...; λ is length of longitudinal wave in corresponding material. Values of angles formed by lateral conical surfaces with plane perpendicular to axis of insulator in cross-section equals critical angle of total internal reflection of reflected longitudinal waves α_кр3 = V_s/V_p and vertexes of these angles face receiver. Conical bushing made of material possessing acoustic rigidity exceeding acoustic rigidity of adjacent elements is put on side of radiator between touching surfaces of elements of higher acoustic rigidity with elements of less acoustic rigidity. Coat produced from material of acoustic rigidity exceeding acoustic rigidity of touching elements is deposited on side of radiator on touching surface between element of higher acoustic rigidity and element of less acoustic rigidity. EFFECT: enhanced insulation efficiency good for down-hole tools for acoustic logging. 2 cl, 2 dwg