Matt circuit

Theory of Ultrasonic Proximity Sensors | How Ultrasonic sensors work? Ultrasonic proximity sensors use a transducer to send and receive high frequency sound signals. When a target enters the beam the sound is reflected back to the switch, causing it to energize or de energize the output circuit. Piezoelectric Disk A piezoelectric ceramic disk is mounted in the sensor surface. It can transmit and receive high-frequency pulses. A high-frequency voltage is applied to the disk, causing it to vibrate at the same frequency. The vibrating disk produces high-frequency sound waves. When transmitted pulses strike a sound-reflecting object, echoes are produced. The duration of the reflected pulse is evaluated at the transducer. When the target enters the preset operating range, the output of the switch changes state. When the target leaves the preset operating range, the output returns to its original state. The emitted pulse is actually a set of 30 pulses at an amplitude of 200 Kvolts. The ec...