US 12,135,277 B1
Cooperative polarization skylight background radiation measurement device and method
Congming Dai, Hefei (CN); Wenqing Xu, Hefei (CN); Jie Zhan, Hefei (CN); Shuai Li, Hefei (CN); Gang Xu, Hefei (CN); and Rui Wang, Hefei (CN)
Assigned to Hefei Institutes of Physical Science, CAS, (CN)
Filed by Hefei Institutes of Physical Science, CAS, Hefei (CN)
Filed on May 7, 2024, as Appl. No. 18/656,937.
Claims priority of application No. 202310806988.X (CN), filed on Jul. 4, 2023.
Int. Cl. G01N 21/21 (2006.01); G01N 21/25 (2006.01); G01N 21/27 (2006.01); G01N 21/3581 (2014.01); G01J 3/02 (2006.01); G01J 3/447 (2006.01); G01J 4/00 (2006.01); G01N 21/47 (2006.01)
CPC G01N 21/211 (2013.01) [G01N 21/255 (2013.01); G01N 21/27 (2013.01); G01N 21/3581 (2013.01); G01J 3/0224 (2013.01); G01J 3/0289 (2013.01); G01J 3/447 (2013.01); G01J 4/00 (2013.01); G01N 2021/213 (2013.01); G01N 2021/4792 (2013.01); Y02A 90/10 (2018.01)] 20 Claims
OG exemplary drawing
 
1. A cooperative polarization skylight background radiation measurement device, comprising a measurement probe, a lower computer control system, a two-dimensional turntable, a base and data transmission interface, as well as an upper computer, wherein the measurement probe is fixed to a pitch axis of a support, and is supported and driven by the two-dimensional turntable which is symmetrical U-shaped; three parallel light cylinders, a polarization imaging light cylinder, a visible light measurement light cylinder, and a near infrared measurement light cylinder, are assembled at a front end of the measurement probe; a division-of-focal plane polarization camera, a polarization wheel, and a double-path spectrometer are installed inside the measurement probe corresponding to the three parallel light cylinders, respectively;
a fisheye lens is installed at a head part of the polarization imaging light cylinder, a band-pass filter is embedded into a middle part of the polarization imaging light cylinder, and the division-of-focal plane polarization camera is connected to a rear end of the polarization imaging light cylinder; the division-of-focal plane polarization camera is configured for polarized imaging of skylight background radiation, and has a black-and-white Complementary Metal-Oxide-Semiconductor (CMOS) sensor with 5 million pixels, and a microlens array and a polarizer array are integrated on a target surface of the division-of-focal plane polarization camera;
the polarizer array is composed of wire-grid polarizers in four directions, with a transmission axis of 0°, 45°, −45° and 90°, respectively, each pixel corresponds to a polarization direction, and pixels of four polarization directions form a super pixel element for imaging calculation; when incident light reaches the polarizer array, a part of the incident light with a polarization direction perpendicular to a wire-grid axis passes through the polarizer array and is received by a photodiode in the CMOS sensor, and a part of the incident light with a polarization direction parallel to the wire-grid axis is reflected and absorbed;
12 holes, which are a pair of solid holes, a pair of 0° polarizer holes, a pair of 45° polarizer holes, a pair of through holes, a pair of 90° polarizer holes, and a pair of 135° polarizer holes, are formed in the polarization wheel, and each pair of holes is installed in a centrally symmetrical manner for measuring dark noise, four groups of polarized radiation, and background light.