FN means on-site inspection, the abbreviation of Field-Test

FT means on-site recording, and the abbreviation of Field-Note

Extended information:

Non-destructive testing is no longer just using X-rays, including various physical phenomena such as sound, electricity, magnetism, electromagnetic waves, neutrons and lasers.

For example, ultrasonic testing, eddy current testing, magnetic particle testing, X-ray testing, penetrant testing, visual testing, infrared testing, microwave testing, leakage testing, acoustic emission testing, magnetic leakage testing, magnetic memory testing, thermal neutron photography testing, laser speckle imaging testing, fiber grating sensing technology and so on, and new methods and technologies are constantly being developed and applied.

Some seemingly very traditional nondestructive testing methods have actually developed many new technologies, such as:

(1) X-ray detection-the traditional technology is film radiography (X-ray and gamma ray). New technologies include: accelerator high-energy X-ray photography, digital radiography (DR), computer radiography (CR, similar to digital photography), computer tomography (CT), ray diffraction and so on.

(2) ultrasonic detection-the traditional technology is: A-mode ultrasound (A-scan ultrasound, A-mode ultrasound). New technologies include: B-scan ultrasound (B-ultrasound), C-scan ultrasound (C-ultrasound), ultrasonic diffraction (TOFD), phased array ultrasound, * * * vibration ultrasound, electromagnetic ultrasound, ultrasonic guided wave and so on.

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