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29 July 2002 Phase-lock techniques using new correlation receivers for TOF-laser ranging
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Optical distance measurement, based on the time-of-flight (TOF) principle, suffer from the unfavorable ratio of desired accuracy and the small received signal power, which is reflected by the target. Many receiver concepts are discussed in the past, but only any concepts are putted into practice. The concept of Photonic Mixer Devices (PMD) offers any interesting features for laser ranging systems, like fast photo-detection with inherent mixing, accumulation of a adequate signal power by a following integration, flicker noise suppression, background illumination, and interference rejection of two-channel designs. The combination of PMD and phase-lock techniques additionally enables a continuous tracking of the object distance, his relative velocity to the measurement system, and the restoration of the received optical signal. Different design concepts of the Photonic Mixer Device (PMD) with their characteristics and advantages as the key component in an Electro-Optical Phase-Locked Loop (OE-PLL) and an Electro-Optical Delay-Locked Loop (OE-DLL) will be discussed.
© (2002) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Zhigang Zhang, Holger Hess, Thorsten Ringbeck, and Rudolf Schwarte "Phase-lock techniques using new correlation receivers for TOF-laser ranging", Proc. SPIE 4723, Laser Radar Technology and Applications VII, (29 July 2002);

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