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Senyd ultrasonic double-sheet sensor

An ultra-high frequency ultrasonic transmitter emits an ultrasonic beam from below the thin film. Sound waves cause the thin film to vibrate, and this also generates a very small sound wave on the other side of the film, which is received by the ultrasonic receiver. When the signal passes through two layers of thin film (double sheet), it becomes very weak and cannot reach the receiver. It can detect missing sheets, single sheets, and double/multiple sheets.