- Author
- Bentz, D. P. | Martin, J. W.
- Title
- Selection of a Spatial Sampling Procedure for Evaluating the Defect Area of a Coated Steel Panel.
- Coporate
- National Institute of Standards and Technology, Gaithersburg, MD
- Journal
- Journal of Coatings Technology, Vol. 57, No. 726, 43-49, July 1985
- Keywords
- steels | monte carlo method | sampling
- Abstract
- Various spatial sampling procedures for determining the defect area of a coated panel are assessed using Monte Carlo techniques. Spatial sampling procedures have many advantages over the comparative visual standards currently used in evaluating defect area. In a previous report, a full grid sampling procedure was employed; the primary disadvantage of this procedure was its long evaluation time. This procedure can be replaced by other sampling procedures with shorter sampling times as long as these other procedures are both accurate and easy to implement into actual practice. From the Monte Carlo simulations, systematic point sampling is found to be superior to both random point and stratified random point sampling in quickly estimating defect area proportion. Two other spatial sampling procedures may also find applications in coatings evaluation, linear sampling which effectively quantifies the corrosion area around a scribe mark and systematic area sampling which provides valuable informaiton on the defect size distribution as well as the total defect area.