12 December 2003 Polarization imaging using active illumination and lock-in like algorithms
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An innovative system architecture for a real time Active Imaging Polarimeter has been developed. The system benefits from very few hardware components (all of which are off the shelf) and a high performance signal recovery algorithm. An electo-optic modulator imposes a waveform of a defined frequency onto the optical signal from a standard telecom laser diode and is transmitted with a known polarization. A unique polarization signature is reflected off a target and imaged through different polarization analyzers onto four quadrants of a high frame rate, near infrared, focal plane array. Using knowledge of the modulation frequency, lock-in amplifier algorithms enable measurement of the received beam intensity and therefore polarization with high SNR performance. Multiple signals (each at unique modulation frequencies) can be differentiated and manipulated (in waveform, wavelength and polarization) to serve many imaging applications. The active imager architecture operates in turbid atmospheres day or night. This technique and its variations provide the necessary tools for a new approach to active imaging, polarimetry, 3D ranging and trace gas imaging.
© (2003) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Matthew Gypson, Michael Dobbs, Jeff Pruitt, Benjamin Neff, Judy Fennelly, "Polarization imaging using active illumination and lock-in like algorithms", Proc. SPIE 5158, Polarization Science and Remote Sensing, (12 December 2003); doi: 10.1117/12.506939; https://doi.org/10.1117/12.506939


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