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We show how to construct and calibrate a full-Stokes imaging polarimeter system by combining the video data from two separate polarization cameras with a nonpolarizing beamsplitter and a waveplate. As a result, this system can capture the full Stokes vector at each pixel for 3 megapixel images at up to 60 Hz. To demonstrate some of the advantages of measuring the
Microgrid polarization cameras have historically experienced lower performance than is typical for monolithic polarization systems. Specifically, their polarizer elements have had a lower extinction ratio and a larger orientation error. We show how to use the calibrated parameters of a nonideal polarizer to modify the polarization measurement model, effectively allowing one to generate high-performance measurements from low-performance elements. We demonstrate the effectiveness of this approach on a commercial polarization camera and estimate the signal-to-noise ratio penalty for using nonideal polarizers in this camera as being 1.25 × versus a system using ideal polarizers.
This course covers the design and analysis of imaging spectrometers, from instrumentation to evaluation and data exploitation. After surveying the fundamentals of spectral imaging, the course provides a detailed survey of various implementations of imaging spectrometers and the benefits of each approach, with special attention to snapshot systems. Performance tradeoffs of noise, light collection capacity, robustness, and other evaluation metrics are introduced and explained, providing a quantitative means of comparing systems. Finally, the course reviews several commonly used algorithms for spectral imaging data and spectral classification, drawing examples from target tracking, infrared gas cloud imaging, and biological fluorescence imaging.
Within the infrared community, it is widely held that uncooled sensors are incapable of doing accurate quantitative work. This course aims to show that quantitative imaging is actually possible with uncooled systems by demonstrating the steps to achieve radiometric calibration in detail and establishing the limits of what can be achieved. Throughout the course, the emphasis is on material that is practical for camera users, rather than for detector designers. The course material provides a thorough introduction into microbolometer pixel design and clarifies the differences between uncooled infrared sensors and photon-integrating sensors. Many of the examples provided are drawn from outdoor measurements, and the course provides a discussion of how to model atmospheric effects on infrared sensing in order to make sense of the thermal infrared world. Examples of quantitative measurements are drawn from the author’s work in infrared gas imaging, atmospheric sensing, and imaging of thermal dynamics.
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