Tuesday, 8 August 2017

CMUTs ARRAYS


  • Capacitive Micromachined Ultrasonic Transducer arrays is a new technology in the field of  ultrasoundsonography.

CONSTRUCTION
  • It contains parallely connected units called cells, made up of silicon.
  • Each cell in the system is a capacitor composed of fixed plate and a flexible plate separated by a vacuum cavity.
  • The vacuum cavity can have any shape.
  • The flexible plate of the system determines the operating frequency of the transducer.
  • Silicon micro matching techniques have enabled the creation of highly efficient CMUTs .


WORKING
  •  If an ac voltage is applied across the flexible membrane , the capacitance of the membrane changes and produce ultrasonic wave in to a medium (as transmitter)
  • If the ultrasound wave is applied across the membrane it will also changes the capacitance produces an alternating signal. (as receiver)

Structure of a 1D CMUT Array

ADVANTAGES 
  • Having higher axial and lateral resolution
  • Higher speed
  • Can easily achieve a fractional bandwidth of over 100% in medical applications.
  • Provides improved 3D and 4D diagnostic applications for areas such as ophthalmology, dermatology, and cardiology.

EXAMPLES OF CMUT ARRAY TRANSDUCERS

  • L22-8v transducer

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