In the food and medical fields, the cleaning of equipment and components is crucial, and it is essential to properly evaluate their cleanliness. In general, ATP swab testing is widely used to assess cleaning conditions; however, measurement results tend to vary depending on the skill of the operator and the specific area being swabbed. Therefore, there is a demand for an objective cleaning evaluation method that is unaffected by the operator, non-contact, and capable of assessing a wide area at once. In this study, we aimed to evaluate the cleanliness of stainless steel containers used in the manufacturing processes of food and pharmaceutical products by assuming the presence of residual oils and organic matter on their surfaces. We investigated a simple optical method by capturing scattered light generated by visible and invisible light to assess the cleaning condition.
TOMISAKA et al. (Wed,) studied this question.