Application of Consumer-Grade Colorimeters to Non-Destructive Bending-Strength Evaluation of Cedar Wooden-Shingle Boards

A high-end laboratory colorimeter and three commercial colorimeters are applied to evaluate the bending strength of the wood used for the roofing material called the cedar wooden-shingle boards. Here, a function analyzing the relationship between the bending strength and the color of woods are used in this application. The function was derived based on the result obtained from a high-end laboratory colorimeter. The strength was then calculated using the function based on the results from commercial colorimeters. The evaluated results shows the strong influences of the structure of the colorimeter, especially the measurement geometry.