Pulsed ultrasound modulated optical tomography with harmonic lock-in holography detection

Ruan, Haowen and Mather, Melissa and Morgan, Stephen P. (2013) Pulsed ultrasound modulated optical tomography with harmonic lock-in holography detection. Journal of the Optical Society of America A, 30 (7). pp. 1409-1416. ISSN 1084-7529

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Abstract

A method that uses digital heterodyne holography reconstruction to extract scattered light modulated by a singlecycle ultrasound (US) burst is demonstrated and analyzed. An US burst is used to shift the pulsed laser frequency by a series of discrete harmonic frequencies which are then locked on a CCD. The analysis demonstrates that the unmodulated light’s contribution to the detected signal can be canceled by appropriate selection of the pulse repetition frequency. It is also shown that the modulated signal can be maximized by selecting a pulse sequence which consists of a pulse followed by its inverted counterpart. The system is used to image a 12 mm thick chicken breast with 2 mm wide optically absorbing objects embedded at the midplane. Furthermore, the method can be

revised to detect the nonlinear US modulated signal by locking at the second harmonic US frequency. © 2013

Optical Society of America

Item Type: Article
Schools/Departments: University of Nottingham UK Campus > Faculty of Engineering > Department of Electrical and Electronic Engineering
Identification Number: https://doi.org/10.1364/JOSAA.30.001409
Depositing User: de Sousa, Mrs Shona
Date Deposited: 04 Apr 2014 13:16
Last Modified: 15 Sep 2016 22:33
URI: http://eprints.nottingham.ac.uk/id/eprint/2728

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