公开(公告)号：US20250067554A1

公开(公告)日：2025-02-27

申请号：US18720021

申请日：2022-12-07

Applicant: Dyson Technology Limited

Inventor： David James GRAHAM ,  Michele BENETTI ,  Sanjeeb TRIPATHY ,  Christopher John BATEMAN ,  Alexander Michael KEMBER

IPC: G01B9/02 ,  G01N15/00 ,  G01N15/0205 ,  G01N15/075

Abstract: A self-mixing interferometer configured to monitor particulate material within a monitored region of space comprising a laser cavity assembly (1A) and an optical assembly (1B) configured to bathe the monitored region with laser light of the interferometer. A laser monitoring unit (1C) is configured to acquire an interferometric signal generated by the interferometer in response to light returned to the laser cavity assembly from said wavefronts by said particulate material. A processing module (1D) is configured to determine a property of the particulate material within the monitored region according to a wavelet transformation of the interferometric signal at least a part of which comprises a waveform of changing frequency.

公开(公告)号：US20230397705A1

公开(公告)日：2023-12-14

申请号：US18034615

申请日：2021-10-13

Applicant: Dyson Technology Limited

Inventor： Thomas Alexander CARLYLE ,  David James GRAHAM ,  Nathan Haruna Waters IMHASLY ,  Robert Lawrence TWEEDIE

IPC: A45D20/12

CPC classification number: A45D20/12 ,  A45D2200/15

Abstract: A haircare appliance has a housing having an air inlet and an air outlet, an airflow generator for generating an airflow from the air inlet to the air outlet, and a heater for heating the airflow. The haircare appliance has an airflow temperature module for obtaining a value indicative of a temperature of the airflow at the air outlet, a distance sensor for sensing a distance to hair within a flow path from the air outlet and a temperature sensor for sensing a temperature of the hair. The haircare appliance has a moisture estimation module configured to estimate, based on received output values from the airflow temperature module, the distance sensor and the temperature sensor, a moisture content of the hair.

公开(公告)号：US20250060297A1

公开(公告)日：2025-02-20

申请号：US18720037

申请日：2022-12-07

Applicant: Dyson Technology Limited

Inventor： David James GRAHAM ,  Michele BENETTI ,  Sanjeeb TRIPATHY ,  Christopher John BATEMAN ,  Alexander Michael KEMBER

IPC: G01N15/0205

Abstract: A self-mixing interferometer configured to monitor particulate material within a monitored region of space comprising a laser cavity assembly (1A) and an optical assembly (1B) configured to bathe the monitored region with laser light of the interferometer possessing wavefronts having different directions at different respective locations within the monitored region. A laser monitoring unit (1C) is configured to acquire an interferometric signal generated by the interferometer in response to light returned to the laser cavity assembly from said wavefronts by said particulate material. A processing module (1D) is configured to determine a property of the particulate material within the monitored region according to changes in the frequency of a waveform within at least a part of the interferometric signal.

公开(公告)号：US20250052663A1

公开(公告)日：2025-02-13

申请号：US18720049

申请日：2022-12-07

Applicant: Dyson Technology Limited

Inventor： David James GRAHAM ,  Michele BENETTI ,  Sanjeeb TRIPATHY ,  Christopher John BATEMAN ,  Alexander Michael KEMBER

IPC: G01N15/1429 ,  G01N15/1434

Abstract: A self-mixing interferometer configured to monitor particulate material within a monitored region of space comprising a laser cavity assembly (1A) and an optical assembly (1B) configured to bathe the monitored region with laser light of the interferometer. A laser monitoring unit (1C) is configured to acquire an interferometric signal generated by the interferometer in response to light returned to the laser cavity assembly from said wavefronts by said particulate material. A processing module (1D) is configured to determine a property of the particulate material within the monitored region according to a structure in data describing the interferometric signal in a frequency-space transformation thereof wherein at least a part of the interferometric signal comprises a waveform of changing frequency.