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A common ultrasound application is an automatic door opener, where an ultrasonic sensor detects a person's approach and opens the door. Ultrasonic sensors are also used to detect intruders; the ultrasound can cover a wide area from a single point.
A curvilinear array ultrasonic transducer for use in medical ultrasonography Inside construction of a Philips C5-2 128 element curved array ultrasound sensor. Ultrasonic transducers and ultrasonic sensors are devices that generate or sense ultrasound energy. They can be divided into three broad categories: transmitters, receivers and transceivers.
Ultrasonic communication is particularly useful in areas where radio frequency can not be used. This includes underwater and underground environments as well as sealed environments, e.g., communication with a sensor inside a pressure tank.
A sensor is a transducer that receives and responds to a signal or stimulus from a physical system. [3] [4] [2] It produces a signal, which represents information about the system, which is used by some type of telemetry, information or control system. An actuator is a device that is responsible for moving or controlling a mechanism or system.
Underwater vector sensor applications have been focused on sonar and target detection. [11] They have also been proposed to be used as underwater multi‐channel communication receivers and equalizers. [13] Other researchers have used arrays of scalar sensors as multi‐channel equalizers and receivers. [14] [15]
For example, net sensors take various underwater measurements and transmit the information back to a receiver on board a vessel. Each sensor is equipped with one or more acoustic transducers depending on its specific function. Data is transmitted from the sensors using wireless acoustic telemetry and is received by a hull mounted hydrophone.
Flexnet™ is a Unattended Ground Sensor capability, [9] from the Swedish company Bertin Exensor, subsidiary of Bertin Technologies. It includes sensors with embedded processing, GPS, and radio communication. Those sensors are based on seismic-acoustic detection, passive infrared, electro-optical and magnetic detection techniques.
Due to the presence of a microprocessor and relatively low power consumption, there is also the capability for serial communication from to other computing devices making this a good technique for adjusting calibration and filtering of the sensor signal, remote wireless monitoring or plant network communications. The ultrasonic sensor enjoys ...
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