Ultrasonic sensing involves using sound waves at frequencies higher than human hearing which is typically above 20KHz to detect object, measure distances or sense presence or absence of any material. Ultrasonic sensing works by emitting ultrasonic wave signal from a transmitter which travels through the medium and as it hits any object the signal partly reflects back, some get absorbed while remaining permeates through the object. This reflected or permeated wave is then detected by the receiver and processed to extract the useful information like the time of flight or the amount of attenuation the signal suffered as it traveled through the material. This article shows how Logarithmic detector like LOG300 can be used in the receive signal chain to process the signal from the ultrasonic receiver for applications like double paper sheet detection, material detection, bubble counter or detection in fluid, material detection and distance or proximity detection.
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Ultrasonic sensing is a technology that utilizes high-frequency sound waves to detect objects and measure distances. This method is widely used in various applications, including industrial automation, automotive systems, and medical. Ultrasonic sensors emit sound waves at frequencies above the human hearing range (typically above 20kHz). The system mainly constitutes of two parts transmit and receive. Driving an ultrasonic transducer can be done in mainly two ways, either by transformer where higher excitation signal is required or directly using H-bridge or an amplifier where comparatively lower excitation is required. Whereas on receive side, there are different types of gain amplifier which can be used for signal processing like fixed gain, variable gain, time varying gain or a logarithmic (log) gain amplifier. This article demonstrates how a log detector can be incorporated in ultrasonic sensing systems to enhance the dynamic range and sensitivity. By using a logarithmic detector, ultrasonic sensing systems can effectively handle weak echoes and strong signals alike, making sure reliable and accurate measurements.