ISO 17020 bagi badan pemeriksa

Seperti ISO 9001, ISO 17025 dan lain-lain, ISO 17020 juga hampir sama dengan ISO 9001 dari aspek pengurusan kualiti dan ISO 17025 dari aspek teknikal. Bagaimanapun penekanan diberikan lebih kepada aspek berikut;
1-Skop - lebih kepada ujian fungsi dan bukan berbentuk analisis
2-Pentadbiran - liabiliti perlindungan insuran
3-Sistem kualiti - perlu melantik pengurus teknikal yang mengawal semua aspek teknikal.
4-Audit dalaman - perlu ada program audit di lapangan
5-Peralatan - mengenal pasti peralatan yang sesuai untuk pemeriksaan
6-Bebas, adil dan berwibawa

Badan pemeriksa NDT di Malaysia yang telah mendapat pengiktirafan ISO17020 ialah;

1. Lott Inspection Sdn. Bhd.
2. SGS (M) Sdn. Bhd
3. Nuclear Malaysia

Ultrasonic Goniometer

Background

• Popular in 1970’s and 1980’s
• Basic research to understand sound mode conversion in materials
• Modeling of experimentation

Principle

• Based on Snell's law

Methodology

• Technique used to study materials surface properties by propagating ultrasound at various angle of incidence.


• Parameter determined - sound velocity and Amplitude

Applications

• Rayleigh and Lamb wave studies
• Rayleigh used to study surface properties eg. Roughness, hardness, residual stress




• Lamb wave for thickness measurement.

References

1. Mohamad Pauzi Ismail, 1981, Ultrasonic Measurement of Stress Using Back Scattered Ultrasound, M.Sc. Dissertation
2. Ismail, M. P., Bloser, D.S., 1983, Ultrasonic Goniometer Measurement of the Properties of Maraging Steel Using Rayleigh Waves, Jurnal Sains Nuklear, Vol 1, No. 2
3. Bridge, B., Ismail, M. P., 1984, Monitoring of Stress by Ultrasonic Backscatter, NDT Communications, P 15, Vol.1, No.5
4. Mohamad Pauzi Ismail, Kamaruddin Mohd. Yusof & Abdul Nassir Ibrahim. 1996. Propagation of Rayleigh wave in concrete. British Journal of Non Destructive Testing INSIGHT, 38(5):338-340.
5. Mohamad Pauzi Ismail, Mat Rasol Awang, Mohd Noorul Ikhsan Ahmad, Amry Amin Abas and Mohd. Fajri Osman, Ultrasonic goniometry measurement of Aquilaria (gaharu) wood, National Physics Conference 2007, Terengganu, 26-28 December 2007.