Ultrasonic devices

History Galton whistle, one of the first devices to produce ultrasound Acousticsthe science of soundstarts as far back as Pythagoras in the 6th century BC, who wrote on the mathematical properties of stringed instruments. Echolocation in bats was discovered by Lazzaro Spallanzani inwhen he demonstrated that bats hunted and navigated by inaudible sound and not vision. Francis Galton in invented the Galton whistlean adjustable whistle which produced ultrasound, which he used to measure the hearing range of humans and other animals, demonstrating that many animals could hear sounds above the hearing range of humans. The first technological application of ultrasound was an attempt to detect submarines by Paul Langevin in

Ultrasonic devices

History Galton whistle, one of the first devices to produce ultrasound Acousticsthe science of soundstarts as far back as Pythagoras in the 6th century BC, who wrote on the mathematical properties of stringed instruments.

Echolocation in bats was discovered by Lazzaro Spallanzani inwhen he demonstrated that bats hunted and navigated by inaudible sound, not vision.

Bolttech Mannings Mini-Max Ultrasonic Bolt Measurement and Monitoring System

Francis Galton in invented the Galton whistlean adjustable whistle that produced ultrasound, which he used to measure the hearing range of humans and other animals, demonstrating that many animals could hear sounds above the hearing range Ultrasonic devices humans.

The first technological application of ultrasound was an attempt to detect submarines by Paul Langevin in Ultrasonic devices The piezoelectric effectdiscovered by Jacques and Pierre Curie inwas useful in transducers to generate and detect ultrasonic waves in air and water.

In air at atmospheric pressure, ultrasonic waves have wavelengths of 1. The Mosquito is an electronic device that uses a high pitched frequency to deter loitering by young people. Animals Bats use ultrasounds to navigate in the darkness.

A dog whistlea whistle which emits sound in the ultrasonic range, used to train dogs and other animals Bats use a variety of ultrasonic ranging echolocation techniques to detect their prey.

These include many groups of mothsbeetlespraying mantids and lacewings.

Ultrasonic devices

Upon hearing a bat, some insects will make evasive manoeuvres to escape being caught. For many processes in the medical, pharmaceutical, military and general industries this is an advantage over inline sensors that may contaminate the liquids inside a vessel or tube or that may be clogged by the product.

Both continuous wave and pulsed systems are used. The principle behind a pulsed-ultrasonic technology is that the transmit signal consists of short bursts of ultrasonic energy.

After each burst, the electronics looks for a return signal within a small window of time corresponding to the time it takes for the energy to pass through the vessel.

Ultrasonic devices

Only a signal received during this window will qualify for additional signal processing. A popular consumer application of ultrasonic ranging was the Polaroid SX camera, which included a lightweight transducer system to focus the camera automatically. Polaroid later licensed this ultrasound technology and it became the basis of a variety of ultrasonic products.

Motion sensors and flow measurement A common ultrasound application is an automatic door opener, where an ultrasonic sensor detects a person's approach and opens the door.

Ultrasound - Wikipedia

Ultrasonic sensors are also used to detect intruders; the ultrasound can cover a wide area from a single point. The flow in pipes or open channels can be measured by ultrasonic flowmeters, which measure the average velocity of flowing liquid. In rheologyan acoustic rheometer relies on the principle of ultrasound.

In fluid mechanicsfluid flow can be measured using an ultrasonic flow meter. Nondestructive testing See also: Macrosonic and Ultrasonic testing Principle of flaw detection with ultrasound. A void in the solid material reflects some energy back to the transducer, which is detected and displayed.

Ultrasonic testing is a type of nondestructive testing commonly used to find flaws in materials and to measure the thickness of objects. Inspection may be manual or automated and is an essential part of modern manufacturing processes.

Most metals can be inspected as well as plastics and aerospace composites. Ultrasound inspection of welded joints has been an alternative to radiography for nondestructive testing since the s.

Ultrasonic inspection eliminates the use of ionizing radiation, with safety and cost benefits. Ultrasound can also provide additional information such as the depth of flaws in a welded joint. Ultrasonic inspection has progressed from manual methods to computerized systems that automate much of the process.

An ultrasonic test of a joint can identify the existence of flaws, measure their size, and identify their location.

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Not all welded materials are equally amenable to ultrasonic inspection; some materials have a large grain size that produces a high level of background noise in measurements.

Ultrasonic range finding Main article: Sonar A common use of ultrasound is in underwater range finding ; this use is also called Sonar.A top advertising award went this year to a campaign in which a radio station broadcast ultrasound to repel mosquitoes. A nice idea, but does it work?

Ultrasound is sound waves with frequencies higher than the upper audible limit of human torosgazete.comound is not different from "normal" (audible) sound in its physical properties, except in that humans cannot hear it.

This limit varies from person to person and is approximately 20 kilohertz (20, hertz) in healthy young adults. Ultrasound devices operate with frequencies from 20 kHz up to. A top advertising award went this year to a campaign in which a radio station broadcast ultrasound to repel mosquitoes.

A nice idea, but does it work? Ultrasonic dental devices have been in use since the s and are important in the armamentarium of oral health care providers.1 Ultrasonic scaling is as effective as hand instrumentation for the removal of calculus and is widely used.

torosgazete.com: Victor Mini MSN Ultrasonic Rodent Repeller with Nightlight, 3-Pack (Not available in HI, NM, PR): Garden & Outdoor.

Bolttech Mannings Mini-Max Ultrasonic Bolt Measurement and Monitoring System Mini-Max Specifications Physical Size. Width ( in / mm) Height ( in / mm).

Flow measurement - Wikipedia