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    TUNABLE HYPERSPECTRAL-POLARIMETRIC IMAGING SYSTEM
    2.
    发明公开
    TUNABLE HYPERSPECTRAL-POLARIMETRIC IMAGING SYSTEM 审中-公开

    公开(公告)号：US20240288309A1

    公开(公告)日：2024-08-29

    申请号：US18573375

    申请日：2021-06-23

    Applicant: Purdue Research Foundation

    Inventor： Xueji Wang ,  Zubin Jacob

    IPC: G01J4/04 ,  G01J3/02 ,  G01J3/28 ,  G01J3/447

    CPC classification number: G01J4/04 ,  G01J3/0229 ,  G01J3/0237 ,  G01J3/2823 ,  G01J3/447 ,  G01J2003/2826

    Abstract: A tunable hyperspectral-polarimetric filter system includes a first polarizer, a crystal filter and a second polarizer. The first polarizer is configured to transmit light in a first direction of linear polarization. The polarization selection may be substantially the same for all wavelengths at a spectral range of interest. The crystal filter, may be parallelly and coaxially disposed after the first polarizer. The crystal filter is configured to rotates the first direction of linear polarization for light transmitted by the first polarizer, wherein rotation angles differ for different wavelengths at the spectral range of interest. The second polarizer may be parallelly and coaxially disposed after the crystal filter. The second polarizer may substantially transmit a second direction of linear polarization of the light transmitted by the crystal filter. The first polarizer and/or the second polarizer are rotatable to tune for different transmission spectra for spectral and polarimetric imaging resolution.

    ULTRAFAST IMAGING SYSTEM WITHOUT ACTIVE PIXEL RESET
    3.
    发明申请
    ULTRAFAST IMAGING SYSTEM WITHOUT ACTIVE PIXEL RESET 有权

    公开(公告)号：US20220260425A1

    公开(公告)日：2022-08-18

    申请号：US17627807

    申请日：2020-07-26

    Applicant: Purdue Research Foundation

    Inventor： Zubin Jacob ,  Liping Yang ,  Leif H Bauer

    IPC: G01J5/20

    Abstract: A bolometric imaging system is disclosed which includes an array of nano-pixels, each including an optical stack, each including an absorptive layer where incident radiation is converted to heat which simultaneously acts as a first electrode layer vertically disposed adjacent the Free Layer, a fixed magnetic polarity layer (Fixed Layer) in a first magnetic direction, a barrier layer vertically disposed adjacent to the Fixed Layer, a selective magnetic polarity layer (Free Layer) vertically disposed adjacent to the barrier layer, a second electrode layer vertically disposed adjacent the Fixed Layer. Photons absorbed by the optical stack are converted into heat to thereby switch magnetic polarity in the Free Layer. The switch in polarity does not require the stack to be reset to a neutral state prior to such switching. Each nano-pixel output is a digital signal generated by photons above a pre-determined energy threshold. The system further includes a readout circuit.

    HEAT ASSISTED DETECTION AND RANGING BASED ON SPECTROPOLARIMETRIC IMAGING
    6.
    发明公开
    HEAT ASSISTED DETECTION AND RANGING BASED ON SPECTROPOLARIMETRIC IMAGING 审中-公开

    公开(公告)号：US20230341265A1

    公开(公告)日：2023-10-26

    申请号：US17778842

    申请日：2020-12-06

    Applicant: Purdue Research Foundation

    Inventor： Zubin Jacob ,  Fanglin Bao ,  Xueji Wang

    IPC: G01J3/447 ,  G01J3/28 ,  G01J5/48 ,  G06V10/30 ,  G06V10/54 ,  G06V10/75

    CPC classification number: G01J3/447 ,  G01J3/2823 ,  G01J5/485 ,  G06V10/30 ,  G06V10/54 ,  G06V10/751 ,  G06V10/758 ,  G01J4/04

    Abstract: A method of generating object surface texture in thermal infrared images is disclosed which includes receiving heat radiation from a scene by a spectropolarimetric imaging system, generating a plurality of spectral frames associated with the scene, each frame having a plurality of pixels, for each pixel from the generated plurality of spectral frames, extracting spectral information associated with the scene, including pixel-specific temperature representing an objects temperature, and thermal texture factor representing the objects texture, for each of a plurality of materials having a specific emissivity in a library, generating reference spectral information as a function of temperature and thermal texture, matching the extracted spectral information for each pixel from the generated plurality of spectral frames to the generated reference spectral information using a statistical method to minimize the associated variation, and extracting spectral metadata from the matched reference spectral information for the associated material based on the match.

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