17.1 to 32inch SAW wide screen
Surface Acoustic Wave technology
high quality touch sensor
high durability
USB/ COM interf

 17.1 to 32inch SAW wide screen

 
SAW Touch screen use pure glass wiht transmitting and receiving piezoelectric transducers for both the X and Y axes. The touch screen controller sends a five-megahertz electrical signal to the transmitting transducer, which converts the signal into ultrasonic waves within the glass. These waves are directed accross the front surface of the touch screen by an array of reflectors. Reflectors on the opposite side gather and direct the waves to the receiving transducer, which reconverts them into an electrical signal. When you touch the screen, you absorb a portion of the wave traveling  across it. The received signal is then compared to the stored digital map, the change recognized, and a coordinate calculate. This process happens independtly for bothe the X and Y axes. By measuring the amount of the signal that is absorbed, a Z-axis is also determined. The digitized coordinates are transmitted to the computer for processing.