公开(公告)号：US11573172B2

公开(公告)日：2023-02-07

申请号：US16352351

申请日：2019-03-13

Applicant: FLIR Systems AB

Inventor： Tomas Lannestedt ,  Ulf Wallgren ,  Jonas Sandsten

IPC: G01N21/3504 ,  G01J3/427

Abstract: Systems and methods disclosed herein provide for detecting gas by: illuminating, with a controllable illuminator system, a scene with light including radiation within the infrared (IR) wavelength range; controlling the illuminator system to emit light at a first wavelength corresponding to a first absorption level of a gas and at a second wavelength corresponding to a second absorption level of a gas, such that an equal amount of radiant energy over a time period is emitted onto the scene for each of said first and second wavelengths; and capturing a first IR image of the scene being illuminated with light at said first wavelength and a second IR image of the scene illuminated with light at said second wavelength, and comparing said first and second IR images to determine whether a characteristic for at least one specific gas is represented in said first and/or second IR images.

公开(公告)号：US10422741B2

公开(公告)日：2019-09-24

申请号：US15692805

申请日：2017-08-31

Applicant: FLIR Systems AB

Inventor： Jonas Sandsten ,  Erik Ekerot

IPC: G01N21/3504 ,  G01N21/31 ,  G01J3/02 ,  G01J3/28 ,  G01M3/38 ,  G01J3/45 ,  G01N21/17

Abstract: Systems and methods disclosed herein, in accordance with one or more embodiments provide for imaging gas in a scene, the scene having a background and a possible occurrence of gas. In one embodiment, a method and a system adapted to perform the method includes: controlling a thermal imaging system to capture a gas IR image representing the temperature of a gas and a background IR image representing the temperature of a background based on a predetermined absorption spectrum of the gas, on an estimated gas temperature and on an estimated background temperature; and generating a gas-absorption-path-length image, representing the length of the path of radiation from the background through the gas, based on the gas image and the background IR image. The system and method may include generating a gas visualization image based on the gas-absorption-path-length image to display an output image visualizing a gas occurrence in the scene.

公开(公告)号：US11635370B2

公开(公告)日：2023-04-25

申请号：US16586809

申请日：2019-09-27

Applicant: FLIR Systems AB

Inventor： Hakan E. Nygren ,  Jonas Sandsten ,  Per Lilja ,  Marta Barenthin-Syberg ,  Henning Hagman ,  Eric A. Kurth ,  Brian B. Simolon ,  Naseem Y. Aziz ,  Ulf Wallgren

IPC: G01N21/3504 ,  H04N5/33 ,  G06T5/50

Abstract: An IR imaging device includes an optical element receiving infrared radiation from a scene, a filter blocking IR radiation outside of a particular range of wavelengths, an array of sensor pixels to capture an image of the scene based on infrared radiation received through the optical element and filter, the array of sensor pixels comprising a first array of sensor pixels to image gas in within a first spectral bandwidth, and a second array of sensor pixel to sense IR radiation in a second spectral bandwidth where gas is not detected, a read-out integrated circuit (ROIC) and logic circuitry to generate a first image sensed by the first array and a second image sensed by the second array, and gas detection logic to detect the presence of gas in the first image.

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：US20200025679A1

公开(公告)日：2020-01-23

申请号：US16586809

申请日：2019-09-27

Applicant: FLIR Systems AB

Inventor： Hakan E. Nygren ,  Jonas Sandsten ,  Per Lilja ,  Marta Barenthin-Syberg ,  Henning Hagman ,  Eric A. Kurth ,  Brian B. Simolon ,  Naseem Y. Aziz ,  Ulf Wallgren

IPC: G01N21/3504 ,  H04N5/33

Abstract: An IR imaging device includes an optical element receiving infrared radiation from a scene, a filter blocking IR radiation outside of a particular range of wavelengths, an array of sensor pixels to capture an image of the scene based on infrared radiation received through the optical element and filter, the array of sensor pixels comprising a first array of sensor pixels to image gas in within a first spectral bandwidth, and a second array of sensor pixel to sense IR radiation in a second spectral bandwidth where gas is not detected, a read-out integrated circuit (ROIC) and logic circuitry to generate a first image sensed by the first array and a second image sensed by the second array, and gas detection logic to detect the presence of gas in the first image.

公开(公告)号：US10416076B2

公开(公告)日：2019-09-17

申请号：US15693007

申请日：2017-08-31

Applicant: FLIR Systems AB

Inventor： Jonas Sandsten ,  Jonce Kotaleski ,  Erik Ekerot

IPC: G01N21/3518 ,  G01N21/3504 ,  G06T5/50

Abstract: A method and a system to quantify gas in a thermal imaging device, said method comprising obtaining a gas-absorption-path-length image as a scene difference infrared image based on a gas infrared image and a scene background infrared image substantially depicting the same scene and generating a quantified scene difference infrared image based on said scene difference infrared image and a predefined gas-quantifying relation.

公开(公告)号：US20180011009A1

公开(公告)日：2018-01-11

申请号：US15692805

申请日：2017-08-31

Applicant: FLIR Systems AB

Inventor： Jonas Sandsten ,  Erik Ekerot

IPC: G01N21/3504 ,  G01J3/45 ,  G01J3/28 ,  G01M3/38 ,  G01J3/02

Abstract: Systems and methods disclosed herein, in accordance with one or more embodiments provide for imaging gas in a scene, the scene having a background and a possible occurrence of gas. In one embodiment, a method and a system adapted to perform the method includes: controlling a thermal imaging system to capture a gas IR image representing the temperature of a gas and a background IR image representing the temperature of a background based on a predetermined absorption spectrum of the gas, on an estimated gas temperature and on an estimated background temperature; and generating a gas-absorption-path-length image, representing the length of the path of radiation from the background through the gas, based on the gas image and the background IR image. The system and method may include generating a gas visualization image based on the gas-absorption-path-length image to display an output image visualizing a gas occurrence in the scene.

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：US11474030B2

公开(公告)日：2022-10-18

申请号：US16911328

申请日：2020-06-24

Applicant: FLIR Systems AB

Inventor： Henrik Viklund ,  Jonas Sandsten

IPC: G01N21/3504 ,  G01J5/00 ,  G06T7/254 ,  H04N5/33 ,  H04N5/232 ,  G01N21/3518

Abstract: Improved techniques for quantification of detected gases are provided. In one example, a method includes receiving infrared radiation from a scene at a sensor array comprising first and second sets of infrared sensors associated with first and second wavelength ranges of the infrared radiation, respectively. The method also includes capturing first and second images by the first and second sets of infrared sensors, respectively. The method also includes detecting a background object in the first image. The method also includes tracking the background object to identify the background object in the second image. The method also includes updating a radiometric scene map with first and second radiometric values associated with the first and second images and correlated to a location of the background object in the scene. The method also includes performing gas quantification using the radiometric scene map. Additional systems and methods are also provided.

公开(公告)号：US11035786B2

公开(公告)日：2021-06-15

申请号：US16905871

申请日：2020-06-18

Applicant: FLIR Systems AB

Inventor： Hakan E. Nygren ,  Eric A. Kurth ,  Jonas Sandsten

IPC: G01N21/3504 ,  G01J5/24 ,  G01J5/26

Abstract: Improved techniques for infrared imaging and gas detection are provided. In one example, a system includes a sensor array configured to receive infrared radiation from a scene comprising a background portion and a gas. The sensor array includes a first set of infrared sensors configured with a first spectral response corresponding to a first wavelength range of the infrared radiation associated with the background portion. The sensor array also includes a second set of infrared sensors configured with a second spectral response corresponding to a second wavelength range of the infrared radiation associated with the gas. The system also includes a read out integrated circuit (ROIC) configured to provide pixel values for first and second images captured by the first and second sets of infrared sensors, respectively, in response to the received infrared radiation. Additional systems and methods are also provided.