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Wideband Optical Detector of Ultrasound for Medical Imaging Applications

Wideband Optical Detector of Ultrasound for Medical Imaging Applications

Published on: May 11, 2014

Sensitive ultrasonic vibrometer for very low frequency applications.

B Cretin¹, P Vairac, N Jachez

¹Department LPMO, FEMTO-ST Institute, 32 Avenue de l'Observatoire, 25044, Besançon Cedex, France.

The Review of Scientific Instruments

|September 4, 2007

Summary

This study introduces an ultrasonic vibrometer with ultralow noise electronics, overcoming limitations of traditional methods for measuring vibrations on rough surfaces. It offers reduced low-frequency noise and non-contact measurement capabilities for laboratory applications.

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Area of Science:

Physics
Engineering
Acoustics

Background:

Ultrasonic distance measurement is cost-effective but limited in sensitivity, resolution, and bandwidth for lab use.
Existing optical vibrometers face challenges with rough surfaces and low-frequency noise.
Contact accelerometers can mechanically load vibrating structures.

Purpose of the Study:

To present a novel ultrasonic vibrometer probe with enhanced performance.
To detail the physical principles and electronic design of the developed probe.
To demonstrate its application in measuring low-frequency vibrations on an optical bench.

Main Methods:

Development of an ultrasonic probe with ultralow noise electronics.
Implementation of a 3/2 order phase-locked loop (PLL) for vibration amplitude extraction.
Non-contact measurement of vibration on an isolated optical bench excited by an electromagnetic transducer.

Main Results:

The probe exhibits reduced very low-frequency noise (0.1 Hz to 1 kHz).
Long wavelength allows investigation of rough surfaces.
The differential sensor design minimizes mechanical loading on the structure.

Conclusions:

The developed ultrasonic vibrometer offers a viable alternative to optical methods for specific applications.
Its ultralow noise electronics and non-contact nature are key advantages.
The probe is suitable for measuring low-frequency vibrations on challenging surfaces.