This invention enables the localization of polarization neutral points in the sky using a novel single-pixel polarimetric detection method, with no need for imaging optics or focal plane arrays. As the device rotates, it observes different parts of the sky at changing polarization angles, causing polarized regions to produce intensity variations at twice the rotation frequency, while the neutral point maintains a steady intensity. Background: Single pixel polarimetry is based on the concept of measuring polarization without a traditional camera. Instead, these systems use patterned polarization elements or structured light patterns to encode information about a scene, and a single detector measures only the total intensity for each pattern. Then, by running these measurements through computational algorithms, the system can reconstruct the full polarization state of the light. Researchers have shown that this approach works for both basic polarization measurements as well as for complex tasks like multispectral, hyperspectral, and Mueller matrix polarimetry, proving that a single pixel setup can recover detailed polarization information across many different types of scenes and scales. Applications:
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