Quick Answer:
Yes, Roll-2-Roll® Sensors detect clear films using infrared light reflection without recalibration.
Yes. Roll-2-Roll® Sensors detect clear films using infrared light reflection. Even transparent materials reflect a small amount of infrared light, which the sensor's CMOS line camera captures and the controller's adaptive edge detection picks out. This is an advantage over ultrasonic sensors, whose readings shift with temperature and which can't work in vacuum, and over infrared sensors that typically need recalibration for different films.