Abstract

A new technique has been found that uses in-phase and quadrature phase (I∕Q) demodulation to optimize the images produced with an amplitude-modulated laser imaging system. An I∕Q demodulator was used to collect the I∕Q components of the received modulation envelope. It was discovered that by adjusting the local oscillator phase and the modulation frequency, the backscatter and target signals can be analyzed separately via the I∕Q components. This new approach enhances image contrast beyond what was achieved with a previous design thatprocessed only the composite magnitude information.

© 2007 Optical Society of America

Amplitude-modulated laser imager

Linda Mullen, Alan Laux, Brian Concannon, Eleonora P. Zege, Iosif L. Katsev, and Alexander S. Prikhach
Appl. Opt. 43(19) 3874-3892 (2004)

Underwater three-dimensional imaging with an amplitude-modulated laser radar at a 405 nm wavelength

Luciano Bartolini, Luigi De Dominicis, Mario Ferri de Collibus, Giorgio Fornetti, Massimiliano Guarneri, Emiliano Paglia, Claudio Poggi, and Roberto Ricci
Appl. Opt. 44(33) 7130-7135 (2005)

Modulated pulse laser with pseudorandom coding capabilities for underwater ranging, detection, and imaging

Brandon Cochenour, Linda Mullen, and John Muth
Appl. Opt. 50(33) 6168-6178 (2011)

Digital passband processing of wideband-modulated optical signals for enhanced underwater imaging

Linda Mullen, Robert Lee, and Justin Nash
Appl. Opt. 55(31) C18-C24 (2016)

Optical modulation techniques for length sensing and control of optical cavities

B. W. Barr, S. H. Huttner, J. R. Taylor, B. Sorazu, M. V. Plissi, and K. A. Strain
Appl. Opt. 46(31) 7739-7745 (2007)