The wall-thicknesses of insulated pipelines can be easily evaluated by measuring the gamma transmission intensity because this intensity is inversely proportional to the thickness of insulated pipeline. The main purpose of this study is to fabricate the nondestructive and filmless on-line inspection system of corrosion by measuring the wall-thickness of insulated pipelines. The inspection system with 64 channel photo diode array detectors, pre-amplifier, amplifier, and data acquisition system has been designed and fabricated, and finally mounted on an external pipeline-crawler. The traditional off-line radiographic method carried out by exposing film-cassettes can be replaced by this cost-effective on-line digital imaging method and the application will be greatly expected especially in the chemical and petrochemical industries.
Kor. Phys. Society Conf. in Fall, Oct 19-20 2001 Chunam Nat. Univ., Kwangjoo