Title

Narrowband Ultrasonic Phased Array Control Using A Photonic Beamformer

Keywords

Acousto-optics; Beamforming; Nematic liquid crystals; Phased arrays; Photonics; Ultrasound

Abstract

A novel narrowband photonic beamformer for ultrasonic phased array control is proposed and demonstrated. The dual Bragg cell in-line optical design allows for the use of radio frequency Bragg cells for stable low frequency (DC-15 MHz) signal generation for driving ultrasonic arrays. Two tiny stamp size nematic liquid crystal devices provide the sites for signal phase (0-2π) and amplitude control. The proof-of-principle beamformer demonstrated 0-2π phase control and 55.8 dB gain control for a 10 MHz output signal that showed a carrier-to-noise ratio of 108 dB Hz-1 at + 100 kHz offset. Both continuous and pulsed mode beamformer operation are demonstrated. Features of the photonic beamformer include analog control, wide tuning range, fiber remoting, size/weight advantages, and low control power operation.

Publication Date

1-1-1996

Publication Title

Ultrasonics

Volume

34

Issue

1

Number of Pages

9-18

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/0041-624X(96)00002-9

Socpus ID

0030109905 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/0030109905

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