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Demodulation techniques for the amplitude modulated laser imager.

Linda Mullen¹, Alan Laux, Brandon Cochenour

¹Electro-Optics and Special Mission Sensors Division, Naval Air Systems Command, NAVAIR, Patuxent River, MD 20670, USA. linda.mullen@navy.mil

|October 24, 2007

Summary

A new laser imaging technique uses in-phase and quadrature (I/Q) demodulation to significantly improve image contrast. This method separates target and backscatter signals, optimizing image quality beyond previous designs.

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Area of Science:

Optics and Photonics
Signal Processing

Background:

Amplitude-modulated laser imaging systems often face challenges with image contrast.
Previous designs processed only composite magnitude information, limiting image optimization.

Purpose of the Study:

To introduce and evaluate a novel technique using in-phase and quadrature (I/Q) demodulation for optimizing laser imaging.
To enhance image contrast in amplitude-modulated laser imaging systems.

Main Methods:

Utilized an I/Q demodulator to capture the I/Q components of the modulation envelope.
Adjusted local oscillator phase and modulation frequency to analyze I/Q components separately.

Main Results:

Successfully separated backscatter and target signals by analyzing I/Q components.

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Last Updated: Jul 10, 2026

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Achieved enhanced image contrast compared to systems processing only composite magnitude information.

Conclusions:

In-phase and quadrature demodulation offers a superior method for optimizing laser imaging.
This technique provides a significant advancement in achieving higher image contrast in amplitude-modulated systems.