Real-time holographic heterodyne spatial filtering

Jed Khoury

doi:10.1117/12.2558507

24 April 2020 Real-time holographic heterodyne spatial filtering

Jed Khoury

Proceedings Volume 11400, Pattern Recognition and Tracking XXXI; 114000J (2020) https://doi.org/10.1117/12.2558507
Event: SPIE Defense + Commercial Sensing, 2020, Online Only

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.

Conference Presentation

Citation Download Citation

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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