公开(公告)号：US12105020B2

公开(公告)日：2024-10-01

申请号：US17351126

申请日：2021-06-17

Applicant: FLIR Systems AB

Inventor： Jonas Sandsten ,  Sten Lindau

IPC: G01N21/3518 ,  G02B5/28 ,  G02B13/14

CPC classification number: G01N21/3518 ,  G02B5/281 ,  G02B13/14 ,  G01N2201/0648 ,  G01N2201/0686

Abstract: Provided are systems and methods to filter infrared spectrum radiation that can be integrated with a compact optical system for an infrared imaging system. The optical system includes an objective lens element configured to receive and transmit infrared (IR) radiation from a scene, where the IR radiation from the scene includes a particular range of wavelengths corresponding to an absorption spectrum or a transmission spectrum of a gas. The optical system also includes a spectral lens element configured to receive the IR radiation transmitted through the objective lens element, where the spectral lens element comprises a first interference filter disposed on a first surface of the spectral lens element. The interference filter is configured to filter the IR radiation transmitted through the objective lens element to a narrower wavelength band that includes the particular range of wavelengths.

公开(公告)号：US20210310941A1

公开(公告)日：2021-10-07

申请号：US17351126

申请日：2021-06-17

Applicant: FLIR Systems AB

Inventor： Jonas Sandsten ,  Sten Lindau

IPC: G01N21/3518 ,  G02B13/14 ,  G02B5/28

Abstract: Provided are systems and methods to filter infrared spectrum radiation that can be integrated with a compact optical system for an infrared imaging system. The optical system includes an objective lens element configured to receive and transmit infrared (IR) radiation from a scene, where the IR radiation from the scene includes a particular range of wavelengths corresponding to an absorption spectrum or a transmission spectrum of a gas. The optical system also includes a spectral lens element configured to receive the IR radiation transmitted through the objective lens element, where the spectral lens element comprises a first interference filter disposed on a first surface of the spectral lens element. The interference filter is configured to filter the IR radiation transmitted through the objective lens element to a narrower wavelength band that includes the particular range of wavelengths.

公开(公告)号：US20220291047A1

公开(公告)日：2022-09-15

申请号：US17688781

申请日：2022-03-07

Applicant: FLIR Systems AB

Inventor： Sten Lindau ,  Austin A. Richards

IPC: G01J5/061 ,  G01J5/0802 ,  G01J5/0806

Abstract: Various techniques are disclosed to reduce the effect of reflected infrared radiation on cooled thermal imaging systems. In one example, a system includes an integrated dewar cooler assembly (IDCA) configured to maintain an interior volume at a constant temperature. The system also includes a thermal imager disposed within the interior volume and configured to capture thermal images. The system also includes an optical element external to the IDCA and configured to provide reflected infrared radiation in a uniform distribution over a field of view of the thermal imager in response to emitted infrared radiation from the thermal imager. Additional methods, devices, and systems are also provided.