Pressure transducer for measuring acoustic radiation force based on a magnetic sensor

H. A S Kamimura, T. Z. Pavan, T. W J Almeida, M. L A Pádua, A. L. Baggio, Mostafa Fatemi, A. A O Carneiro

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

This work presents a pressure transducer based on a magnetic sensor to measure acoustic radiation force (ARF) and small displacements. The methodology presented in this paper allowed this transducer to be calibrated for use as an acoustic pressure and intensity meter. It can control the acoustic intensity emitted by ultrasound used, for example, in ARF impulse imaging, vibro-acoustography and high-intensity focused ultrasound techniques. The device comprises a magnet, a membrane, a magnetoresistive sensor and a coil to cancel the external magnetic field. When ARF is applied to the membrane, the magnetic field on the sensor changes due to the magnetic target displacement. The variation of the output signal from the magnetic transducer is proportional to the acoustic pressure applied to the membrane. A focused ultrasound transducer with a central frequency of 3 MHz was used to apply a continuous ARF. The sensitivities of the magnetic transducer as an acoustic pressure and intensity meter, evaluated in water, were respectively 0.597 μVMPa-1 and 0.073 μV (W cm-2)-1/2, while those of the needle hydrophone (Onda model HNP-0400) used in the magnetic transducer calibration were respectively, 0.5024 mV MPa-1 and 6.153 mV (W cm -2)-1/2. The transducer resolution to displacement is 5 nm and 6 dB of signal attenuation occurs for 7° of misalignment. The transducer responded well to acoustic pressure in water above 200 kPa.

Original languageEnglish (US)
Article number015101
JournalMeasurement Science and Technology
Volume22
Issue number1
DOIs
StatePublished - Jan 2011

Fingerprint

Acoustic Radiation
Magnetic sensors
Pressure transducers
pressure sensors
magnetic transducers
sound waves
Transducer
Acoustics
Transducers
transducers
Radiation
Sensor
acoustics
sensors
membranes
Ultrasound
Ultrasonics
Membrane
Membranes
hydrophones

Keywords

  • Acoustic pressure
  • Acoustic radiation force
  • Magnetic sensor
  • Ultrasound

ASJC Scopus subject areas

  • Applied Mathematics
  • Instrumentation

Cite this

Kamimura, H. A. S., Pavan, T. Z., Almeida, T. W. J., Pádua, M. L. A., Baggio, A. L., Fatemi, M., & Carneiro, A. A. O. (2011). Pressure transducer for measuring acoustic radiation force based on a magnetic sensor. Measurement Science and Technology, 22(1), [015101]. https://doi.org/10.1088/0957-0233/22/1/015101

Pressure transducer for measuring acoustic radiation force based on a magnetic sensor. / Kamimura, H. A S; Pavan, T. Z.; Almeida, T. W J; Pádua, M. L A; Baggio, A. L.; Fatemi, Mostafa; Carneiro, A. A O.

In: Measurement Science and Technology, Vol. 22, No. 1, 015101, 01.2011.

Research output: Contribution to journalArticle

Kamimura, H. A S ; Pavan, T. Z. ; Almeida, T. W J ; Pádua, M. L A ; Baggio, A. L. ; Fatemi, Mostafa ; Carneiro, A. A O. / Pressure transducer for measuring acoustic radiation force based on a magnetic sensor. In: Measurement Science and Technology. 2011 ; Vol. 22, No. 1.
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