NDT.net - April 2003, Vol. 8 No.4

GENERAL PRINCIPLES OF RELIABILITY ASSESSMENT OF NONDESTRUCTIVE DIAGNOSTIC SYSTEMS AND ITS APPLICABILITY TO THE DEMINING PROBLEM

Christina Müller, Martina Scharmach
(Federal Institute for Materials Research and Testing (BAM), Germany)
(Christina.Mueller@bam.de, Martina.Scharmach@bam.de)
Vera Konchina
(NIIM/PGUPS, St. Petersburg, Russia)
(konshina@ndtcenter.spb.ru)
Damir Markucic
(Faculty of Mechanical Engineering & Naval Architecture, University of Zagreb, Croatia
(damir.markucic@fsb.hr)
Zeljko Piscenec
(Croation Mine Action Centre)
(zeljko.piscenec@hcr.hr)

Paper presented at the 8th ECNDT, Barcelona, June 2002

Abstract

Introduction: Background and overview of the approaches

Reliability Definition for Mine Detection Systems:

Fig 4: Modular Validation - Application of the Reliability Theory of Systems - Set up Scientific Basis & RULES for the Technical Justification, Fig 5: Combination of the individual Factors within a modular Approach.

Integral approach: ROC – Receiver operating characteristic and its relation to POD

Fig 6: The Principles of ROC (Reciver Operating Characteristic) The Possible Diagnosis Results in NDT. Fig 7: Characteristic of one NDT-System by an ROC curve.

Example 1: Reliability investigation of manual ultrasonic testing

Fig 11: Outline of Experiments. Fig 12: ROC Results: Curves.

Example 2: Results of test trials for metal detectors in ROC diagrams and conclusions for performance demonstration

Fig 13: IPPTC result in a ROC diagram (Total number of actually present mines 20 mines with IPPTC-configuration 8 mines with CMAC-configuration. Fig 14: a) Test Results of realistic trials in an highly mine effected country (Afghanistan 1999/2000) data provided by JRC Ispra b) ASME-Code (Sect. XI, App. VIII) in a ROC-Diagram (increasing number of grading units: 15 Ž 60).

Statistical Methods for evaluating performance (taken from point 7.4 of the CEN BT 126 CWA 07 document)

Example 3:

year of planning surface area of contaminated land area planned for level I survey – area reduction, km2 area planned for level II survey – reduction, km2 area planned for survey and mine clearence using classic methods (manually), km2 area planned for survey and mine clearence using machines and subsequent verification by another method, km2 fencing og mine contaminated and marking of mine suspected areas, km
 total km2 total km2 planned to be achieved     
2000.* 4.5001006020155 400
2001. 4.400 500325253020 500
2002.3.9005003002530 30 500
2003.3.400500300253030500
2004. 2.900500300253030500
2005.2.400500 28030 3040500
2006.1.900500 280303040 200
2007.1.400500320252035200
2008.900300150252035100
2009. 60030015025203050
2010.300 3001502520300
total 45002615280275 3253450
Table 1: table X. the plan for overall activities in the process of survey and mine clearence in Croatia for the period of 2000-2010. [The national mine action programme in the Republic of Croatia, brochure published by CroMAC – Croatian Mine Action Center, April 2001.]
*The year 2000 was shown as a starting point with defined area of total mine contamination with mines and UXO covering 4500 km2

Map of the site

On site results (Fig. 21 and table 2)

Summary and outlook

Acknowledgement

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