公开(公告)号：US20210247231A1

公开(公告)日：2021-08-12

申请号：US17054411

申请日：2019-05-22

Applicant: THE SECRETARY OF STATE FOR DEFENCE

Inventor： SEAN MICHAEL TSI-ONG TIPPER ,  CHRISTOPHER DAVID BURGESS

IPC: G01J1/44 ,  G02B26/02

Abstract: A method of detecting pulsed radiation comprising the steps of irradiating at least a portion of an array of sensor elements with pulsed radiation (71); addressing the array using a rolling shutter operation (72); reading the array to obtain a radiation image (73); and then applying a pulse detection operation (74) to the radiation image. The rolling shutter operation (72) is configured to address each element line of the array for a predetermined integration period. The predetermined integration period being calculated using an integration period function, itself a function of an anticipated pulse repetition interval of the pulsed radiation. The method and apparatus for the same enable low cost camera arrays to be used for pulse detection and for wider application in the field of low cost communications.

公开(公告)号：US20200064185A1

公开(公告)日：2020-02-27

申请号：US16468730

申请日：2017-12-12

Applicant: THE SECRETARY OF STATE FOR DEFENCE

Inventor： CHRISTOPHER DAVID BURGESS ,  SEAN MICHAEL TSIONG SEAN

IPC: G01J1/42 ,  G01J1/04 ,  G01S3/78

Abstract: A laser detector apparatus (1) is provided, where a pixel array (3) is arranged behind a lens arrangement (4) such that distant objects (9) (in general, those at infinity) are out of focus at the pixel array. The image from the pixel array is evaluated by a computer processor (6) to detect such out of focus images which will be of a known size and shape (generally circular spots of known width). This can enable distant laser threats to be readily distinguished from nearby bright objects (10), whilst also protecting the pixel array from powerful laser sources (because the laser energy is not focussed to a point, on the pixel array it is less likely to damage the pixel array). It can also enable the wavelength of the laser to be accurately determined from the ratio of colours in the image of the laser spot, because it will typically not be a saturated image. The apparatus and method are particularly suitable for identifying and distinguishing laser sources across a wide range of brightnesses, and is also suitable for detecting and distinguishing multiple laser sources.