METHOD FOR THERMAL NONDESTRUCTIVE INSPECTION OF THERMAL-TECHNICAL STATE OF LONG, NON-UNIFORM AND HARD-TO-REACH OBJECTS Russian patent published in 2011 - IPC G01N25/72 

FIELD: physics.

SUBSTANCE: single-mode or multimode fibre-optic line whose maximum withstand temperature is 200-250°C is laid on the heat insulating surface of an object. Temperature T_internal(t_i) of the heat-conducting fluid flowing inside the object during a time t_i is measured. Heat flux q₀ of the area of the object having quality heat insulation which is taken as reference heat insulation is measured. Insulation temperature T(x,t) is measured at discrete points on the length of the fibre-optic line. A matrix of temperature measurements is created by arranging into columns temperature values at one point of the surface of the heat-protective layer of the object measured at different times, and into rows - temperature values obtained simultaneously at different points on the length of the object. The matrix of the thickness of the heat-protective layer along the inspected object is determined from time and the technical state of the pipe and the value of loss of the transmitted energy are determined from the determined value of thickness of the heat-protective layer.

EFFECT: high reliability of results of inspecting the technical state of long, non-uniform and hard-to-reach objects.

3 cl, 24 dwg