A lossless detection method based on temperature distribution duct

The present invention discloses an apparatus and method for nondestructive testing pipe based on the temperature distribution, the detection means comprises a temperature sensor (1) detecting means, said temperature sensor (1) provided in the duct (2) of the outer wall, and said detecting means is connected to the instrument panel (3); detecting method comprising the steps of: (a) a temperature sensor arrangement (1) in the outer tube wall, as the temperature measuring points, the statistical temperature; (b) take the highest temperature value tw2max, before averaging the remaining 75% from the low to high temperatures for tw2; (C) the outer diameter of the measuring tube, the fluid inside the inlet temperature, air temperature outside the tube, using the statistical values ​​of temperature and tw2 tw2max, Fourier's law are determined wall thickness δ, δ '; (d) reducing the thickness of the wall Δ = δ-δ'. The present invention can be widely used in chemical, petroleum and other industrial fields, low cost, fast, sensitive and safe operation of other unique advantages.