Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) TSUJI Satoshi and KIMOTO Akira and SHIDA Katsunori,Contactless Material Thickness Detection Using Optical and Electrical Integrated Sensor with CdS Cell,Transactions of the Society of Instrument and Control Engineers,0453-4654,The Society of Instrument and Control Engineers,2007,43,10,833-838,https://cir.nii.ac.jp/crid/1390282679480277504,https://doi.org/10.9746/ve.sicetr1965.43.833