Peer-Reviewed Journal Details
Mandatory Fields
Riza, N. A.
1996
March
Ultrasonicsultrasonics
Narrowband ultrasonic phased array control using a photonic beamformer
Validated
()
Optional Fields
34
11
9
189
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 (0-2 pi) and amplitude control. The proof-of-principle beamformer demonstrated 0-2 pi 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.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 (0-2 pi) and amplitude control. The proof-of-principle beamformer demonstrated 0-2 pi 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.
0041-624X0041-624X
://WOS:A1996UJ57700002://WOS:A1996UJ57700002
Grant Details