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24 April 2020 Real-time holographic heterodyne spatial filtering
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Abstract
Traditionally, homodyne and heterodyne are a combination of a frequency mixer followed by a low-pass filter. Mixing two signals of frequencies f1 and f2 generates signals of frequencies f1 + f2 and f1- f2 and their integer multiples. Both multiplication heterodyne and phase-sensitive detection have been demonstrated optically by using photorefractive, four-wave mixing (FWM). The multiplicative characteristic of FWM was used for mixing, and the response time of the photorefractive medium is used for low-pass filtering. If one of the input beams is both spatially and temporally modulated using a controlled oscillating membrane, depends on which model is heterodyned, one can generate an orthogonal set of Bessel bandpass filters. This scheme can be integrated part within parallel data acquisition systems for applications involved in nondestructive testing.
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© (2020) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jed Khoury "Real-time holographic heterodyne spatial filtering", Proc. SPIE 11400, Pattern Recognition and Tracking XXXI, 114000J (24 April 2020); https://doi.org/10.1117/12.2558507
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