Familiarize Electronic Components Part XVI – Ultrasound transceivers


Ultrasound transceivers are sensors that send and receive sound vibrations in the Ultrasonic frequencies. These are used in various applications from motion detection to ultrasound imaging. These are also available in pairs called TX (Transmitter) and RX (Receiver) designed to send and receive ultrasound of same frequency, typically 40kHz.Ultrasound vibrates with a frequency greater than the upper limit of human hearing, but it is not separated from the normal sound based on the physical properties.

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Animal Scarer


Try this circuit and expel unwanted guests from your Kitchen. This Ultrasound generator can scare Rats, Cats, Lizards etc by creating stress on their ear. Sound above 20 kHz is inaudible to human beings but lower animals can hear the ultrasound very well. The high pitch sound always create a hostile environment to animals and they try to avoid such situations.

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Ultrasound Imaging


Ultrasound Imaging or ultrasonography is a diagnostic imaging technique using ultrasound waves. It is used to visualize subcutaneous body structures like tendons, muscles, joints, vessels and internal organs such as heart, kidney etc for possible pathology or lesions. It is possible to perform both diagnosis and therapeutic procedures. Obstetric Sonography is widely used in foetal scanning.

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Bat uses FM Frequency


Echolocation is the biological sonar system used by some animals to navigate or locating prey. They emit ultrasounds in various frequencies that reflect back from the objects. These animals have special ear and brain adaptations to detect the reflected sound. Echolocation is found in animals like Bats, Toothed Whales, Shrews, Dolphins and in some birds. The interesting feature is that Bats emit FM frequencies for precise range discrimination and localization of the target.

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Ultrasound Imaging


Ultrasound Imaging or ultrasonography is a diagnostic imaging technique using ultrasound waves. It is used to visualize subcutaneous body structures like tendons, muscles, joints, vessels and internal organs such as heart, kidney etc for possible pathology or lesions. It is possible to perform both diagnosis and therapeutic procedures. Obstetric Sonography is widely used in foetal scanning.

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Phonotaxis in Insects


Phonotaxis is the movement of animals in response to sound vibrations especially the sound vibrations in the ultrasound range. Even though human ear cannot sense ultrasound, many animal species can produce and hear ultrasound. They respond to certain frequencies of sound and show movements which may be Positive Phonotaxis or Negative Phonotaxis. Positive Phonotaxis refers to the movement of animals towards the source of sound waves of particular frequencies and Negative Phonotaxis away from the sound.

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Ultrasound and Insects


Ultrasonic Pest Repellents are used as substitute for Mosquito coils and liquids to avoid inhaling of toxic fumes. It is the Non toxic way to repel pests like mosquitoes. As per scientific information and experimental evidences, the animals respond to Ultrasound and avoid its presence. Small mammals like Dogs, Cats etc. responds to 22-25 kHz ultrasound and Rats to 60-72 kHz. Insects like Mosquitoes, Flies etc. responds to 38-44 kHz.
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