Tubular workpiece infrared detection device and method

Abstract

The invention discloses a tubular workpiece infrared detection device and method. The tubular workpiece infrared detection device comprises a cold water tank, a hot water tank, a water pipe, a first electromagnetic valve, a second electromagnetic valve, a water pump and a thermal imager; one end of the cold water tank is respectively connected with one end and the hot water tank and one end of a to-be-measured tubular workpiece by the water pipe and the first electromagnetic valve, the other end of the cold water tank is respectively connected with the other end of the hot water tank and the other end of the to-be-measured tubular workpiece by the water pipe and the second electromagnetic valve, the first electromagnetic valve and the second electromagnetic valve control periodic switching of a cold water path and a hot water path, the water pump is arranged on the water pipe between the to-be-measured tubular workpiece and the first electromagnetic valve or the second electromagnetic valve, and is used to drive water flow in the water pipe to flow along the water pipe; and the thermal imager is used for real-time acquisition of change data of surface temperature field of the to-be-measured tubular workpiece. The device and the method provided by the invention can effectively detect deep defects; and further, can also complete 360 degree detection of the to-be-measured tubular workpiece in one time.

Description

technical field [0001] The invention relates to infrared thermal imaging non-destructive detection technology, in particular to an infrared detection device and method for tubular workpieces. Background technique [0002] Active infrared thermal imaging non-destructive testing technology is a non-destructive testing technology developed in the late 1990s. This technology is based on the thermal wave theory and actively applies controllable thermal excitation (such as light, ultrasound, etc.) to objects. etc.), so that the heterogeneous structure information inside the object is displayed in the form of the difference in the surface temperature field change. The phase-locked thermal imaging is to make the defect part produce periodic thermal response by applying periodic modulated thermal excitation to the object to be inspected. , and combined infrared thermal imaging technology with digital phase-locked signal processing technology, by using the difference between the detec...

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Problems solved by technology

[0004] However, in the lock-in thermal imaging technology in the prior art, light and ultrasound are mainly used as thermal excitation sources. However, due to the limited heat penetration depth of such excitation sources, it is difficult to detect deep defects.

In addition, the infrared detection methods in the prior art can only perform thermal excitation on one side of the specimen, so the object to be inspected is mostly a flat plate-shaped specimen, and if the object to be inspected is a tubular workpiece, multiple inspection experiments are required. The detection can only be completed after the test, and the 360° detection of the tubular workpiece cannot be completed at one time

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