公开(公告)号：US11156782B2

公开(公告)日：2021-10-26

申请号：US17136564

申请日：2020-12-29

Applicant: US Gov't as represented by Secretary of Air Force

Inventor： Hengky Chandrahalim ,  Jonathan Smith

IPC: B82Y15/00 ,  G01J3/02 ,  G01J3/26 ,  G01N21/09 ,  G01N21/27 ,  G01N21/85 ,  G02B6/02 ,  G02B6/293 ,  G02B6/36 ,  G02B6/12 ,  B82Y20/00

Abstract: A method of making passive microscopic Fabry-Pérot Interferometer (FPI) sensor includes forming a three-dimensional microscopic optical structure on a cleaved tip of an optical fiber that reflects a light signal back through the optical fiber. The reflected light is altered by refractive index changes in the three-dimensional structure that is subject to at least one of: (i) thermal radiation; and (ii) volatile organic compounds.

公开(公告)号：US20210271027A1

公开(公告)日：2021-09-02

申请号：US17237128

申请日：2021-04-22

Applicant: US Gov't as represented by Secretary of Air Force

Inventor： Jeremiah Williams ,  Hengky Chandrahalim

IPC: G02B6/293

Abstract: A passive microscopic Fabry-Pérot Interferometer (FPI) sensor includes a three-dimensional microscopic optical structure formed on a cleaved tip of the optical fighter using a two-photon polymerization process on a photosensitive polymer by a three-dimensional micromachining device. The three-dimensional microscopic optical structure having a hinged optical layer pivotally connected to a distal portion of a suspended structure. A reflective layer is deposited on a mirror surface of the hinged optical layer while in an open position. The hinged optical layer is subsequently positioned in the closed position to align the mirror surface to at least partially reflect a light signal back through the optical fiber.

公开(公告)号：US20210208270A1

公开(公告)日：2021-07-08

申请号：US17211253

申请日：2021-03-24

Applicant: US Gov't as represented by Secretary of Air Force

Inventor： Ramachandran S. Raghavan

IPC: G01S13/524

Abstract: Detection of a radar target from a received radar signal includes computing a vector of filter weights dependent upon a steering vector and determining a threshold value dependent upon a designated probability of false alarm. The vector of filter weights is applied to samples of the received radar signal at a test cell, corresponding to a test range, to provide a filtered test signal and a test power of the filtered test signal is computed. The weights are also applied to samples of the received radar signal at a number of reference cells, to produce filtered reference signals. A reference power is computed from the filtered reference signals and the radar target is detected at the test range when a ratio of the test power to the reference power exceeds the threshold value.

公开(公告)号：US11054535B2

公开(公告)日：2021-07-06

申请号：US16812844

申请日：2020-03-09

Applicant: US Gov't as represented by Secretary of Air Force

Inventor： Robert Olesen ,  Bryan Egner ,  Darren Holland ,  Valerie Martin ,  James Bevins ,  Larry Burggraf ,  Buckley O'Day

IPC: G01T3/06 ,  G01T1/10 ,  G01T1/20 ,  G01T1/15

Abstract: A directional radiation detection system and an omnidirectional radiation detector. The omnidirectional radiation detector detects radiation comprising at least one of: (i) gamma rays; and (ii) neutron particles. A radiation scatter mask (RSM) of the radiation detection system includes a rotating sleeve received over the omnidirectional radiation detector and rotating about a longitudinal axis. The RSM further includes: (i) a fin extending longitudinally from one side of the rotating sleeve; and (ii) a wall extending from the rotating sleeve and spaced apart from the fin having an upper end distally positioned on the rotating sleeve spaced apart or next to from a first lateral side of the fin and a lower end proximally positioned on the rotating sleeve and spaced apart from or next to a second lateral side of the fin.

公开(公告)号：US20210116644A1

公开(公告)日：2021-04-22

申请号：US17136552

申请日：2020-12-29

Applicant: US Gov't as represented by Secretary of Air Force

Inventor： Hengky Chandrahalim ,  Jonathan Smith

IPC: G02B6/293

Abstract: A passive microscopic Fabry-Pérot Interferometer (FPI) sensor includes an optical fiber a three-dimensional microscopic optical structure formed on a cleaved tip of an optical fighter that reflects a light signal back through the optical fiber. The reflected light is altered by refractive index changes in the three-dimensional structure that is subject to at least one of: (i) thermal radiation; and (ii) volatile organic compounds.

公开(公告)号：US20210114733A1

公开(公告)日：2021-04-22

申请号：US17009079

申请日：2020-09-01

Applicant: US Gov't as represented by Secretary of Air Force

Inventor： Jerry Provenza

IPC: B64D11/06

Abstract: An adaptive force vehicle airbag (AFVA) system includes airbag(s) stowed in a compressed state within an interior of a vehicle. An impact sensor detects a change in motion of the vehicle indicative of a collision. Selectable force gas generator(s) (SFGGs) gas-generating propellant cells that are individually fired. The SFGGs have conduit(s) that receive gas from fired gas-generating propellant cells and direct the gas to inflate at least one of the airbag(s). A controller is communicatively coupled to the inflation initiating component and the gas-generating propellant cells of the SFGGs. The controller enables the AFVA system to: (i) receive an inflation signal from the impact sensor; and (ii) fire a selected number of the gas-generating propellant cells to at least partially inflate the at least one airbag.

公开(公告)号：US20210088718A1

公开(公告)日：2021-03-25

申请号：US16920994

申请日：2020-07-06

Applicant: US Gov't as represented by Secretary of Air Force

Inventor： Christian Keyser

IPC: G02B6/02 ,  H01S5/10

Abstract: A fiber laser system includes a high power pump laser, an optical fiber that is aligned to receive output from the high power pump laser. The fiber laser system includes a first pair of orthogonally opposed, periodic electrode structures longitudinally aligned on opposite first and second sides of the optical fiber. The fiber laser system includes a controller that is communicatively coupled to the first pair of periodic electrode structures. The controller performs variable period poling of the first pair of periodic electrode structures to achieve quasi-phase matching (QPM).

公开(公告)号：US20210033849A1

公开(公告)日：2021-02-04

申请号：US16922079

申请日：2020-07-07

Applicant: US Gov't as represented by Secretary of Air Force

Inventor： Joshua Lentz

IPC: G02B26/08 ,  G02B26/10 ,  G02B5/04

Abstract: An optical steering mechanism includes first and second Risley prisms that each comprise spatially variant photonic crystals. A support structure positions the first and second Risley prisms in parallel alignment with at least a selected one of the first and second axially rotatable to the other one to steer a light path through the optical steering mechanism.