Glass detection

Hi guys, I'm working on a project where I'm automating a "hotte" what I want to do is put a motor to open and close the front door, and I wanted to use a sensor that detects glass and transparent objects, which when the sensor if it detected any object it made the engine stop, but I don't know which sensor to use, can anyone help me? The sensor must be capable of detection at 2 meters📷

Touch here for the full post on the Arduino Apprentices tumblr

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