Paper
21 May 2014 Imaging with photoelastic modulators
Author Affiliations +
Abstract
Photoelastic modulators (PEMs) are among the most robust and precise polarization modulation devices, but the high frequency free-running nature of PEMs challenges their incorporation into relatively slow CCD and CMOS imaging systems. Current methods to make PEMs compatible with imaging suffer from low light throughput or use high cost intensified CCDs. They are not ideal for some analyses (microscopy, reflectivity, fluorescence, etc.), and likely cannot be extended to polarimeters with more than two PEMs. We propose to modulate the light source with a square wave derived from particular linear combinations of the elementary PEM frequencies and phases. The real-time synthesis of the square waves can be achieved using a field programmable gate array (FPGA). Here we describe the operating principle.
© (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Shane Nichols, John Freudenthal, Oriol Arteaga, and Bart Kahr "Imaging with photoelastic modulators", Proc. SPIE 9099, Polarization: Measurement, Analysis, and Remote Sensing XI, 909912 (21 May 2014); https://doi.org/10.1117/12.2053459
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Cited by 5 scholarly publications.
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KEYWORDS
Modulation

Field programmable gate arrays

Clocks

Photoelastic modulators

Polarimetry

Charge-coupled devices

Demodulation

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