Through-Beam Cylindrical ultrasonic Single/Double Sheet Detection sensor for UDC-18GM-400

 The single and double sheet ultrasonic sensor works by measuring the 'difference in acoustic impedance.' The probe emits ultrasonic waves at a fixed frequency, which penetrate the sheet to be tested.  
Single sheet: The ultrasonic waves penetrate a single layer of material, and the reflected/transmitted energy remains stable.  
Multiple sheets: There will be an air layer between the sheets (even if they are touching), causing a sudden change in acoustic impedance, which greatly increases the reflected energy and sharply decreases the transmitted energy.  
The sensor’s built-in algorithm detects the energy difference and outputs a switch signal (single sheet passes, multiple sheets trigger an alarm).

1. Non-contact detection, no wear, does not damage materials
2. Wide range of compatibility, not limited by material properties
3. High detection accuracy, capable of distinguishing ultra-thin multilayers
4. Strong anti-interference capability, suitable for harsh industrial environments
5. Fast response speed, suitable for high-speed production lines