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Ultrasonic sound waves are vibrations at a frequency above the range of human hearing (>20kHz) that can travel through a wide variety of medium (air, fluid, or solid) to detect objects and measure its distance - without making physical contact. Ultrasonic sensors can be used to detect a wide variety of materials regardless of shape, transparency, or color.
If your application requires the use of ultrasonic time-of-flight to measure distance through air from a few centimeters up to several meters, then the PGA460 ultrasonic sensor signal conditioner is TI's recommended device. Please visit the Air-Coupled Ultrasonic Sensors FAQ for more details here:
For liquid-coupled ultrasonic sensing applications including level sensing, fluid contamination and identification sensing, and liquid/gas flow sensing the TDC1000 Ultrasonic AFE is the recommended device. Please visit the Liquid-Coupled Ultrasonic Sensors FAQ for more details here:
To view TI's complete portfolio of Ultrasonic Sensor ICs, visit: http://www.ti.com/sensors/specialty-sensors/ultrasonic/overview.html
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