公开(公告)号：US20230219274A1

公开(公告)日：2023-07-13

申请号：US17999977

申请日：2021-06-09

Applicant: 3M INNOVATIVE PROPERTIES COMPANY

Inventor： William W. Merrill ,  Pradeep P. Bhat ,  Francis T. Caruso ,  David L. Hofeldt ,  David D. Nguyen ,  Ziang Li

IPC: B29C48/92 ,  B29C48/32 ,  B29C48/00 ,  B29C48/18 ,  G01B11/06 ,  G01B11/24

CPC classification number: B29C48/92 ,  B29C48/32 ,  B29C48/0018 ,  B29C48/18 ,  G01B11/06 ,  G01B11/24 ,  B29C2948/92152 ,  B29C2948/92704 ,  B29C2948/92904

Abstract: A sensing system for measurement of a multilayered blown polymeric film. A feedblock supplies polymeric material streams to an annular blown film die to form a plurality of layers of different polymeric materials. A sensing system is positioned adjacent to a film bubble extruded from the blown film die, wherein the blown film bubble includes annular layers of at least two different polymeric materials. The sensing system emits a signal toward selected circumferential positions around the film bubble and receives a plurality of reflected signals at each circumferential position. Each reflected signal in the plurality of reflected signals is generated at an interface between annular layers that includes a refractive index change detectable by the sensing system. A processor processes the reflected signals from the sensing system, and for each circumferential position determines a layer thickness profile for each polymeric material in the film.

公开(公告)号：US20220011238A1

公开(公告)日：2022-01-13

申请号：US17309068

申请日：2019-11-13

Applicant: 3M INNOVATIVE PROPERTIES COMPANY

Inventor： Francis T. Caruso ,  Jeffrey K. Eliason ,  David L. Hofeldt ,  Joseph E. Hernandez ,  Joshua A. Gullickson

IPC: G01N21/84 ,  G01N21/95 ,  G01N21/55 ,  G06T7/00

Abstract: A method includes emitting light from a light source (12) onto an at least partially reflective surface (24). The reflected light (30) is collected from the surface at a screen (32) to capture the intensity distribution (34) of the reflected light with a camera (40) in a first image (42). The intensity distribution of the first image of the reflected light is processed (50) by performing suitable filtering of a Fourier transform of the intensity distribution of the reflected light so as to emphasize features having an intensity variation of interest. The features of the intensity distribution of the reflected light having the variation of interest are analyzed to determine a uniformity value for the surface.

公开(公告)号：US20240293687A1

公开(公告)日：2024-09-05

申请号：US18578544

申请日：2022-07-05

Applicant: 3M INNOVATIVE PROPERTIES COMPANY

Inventor： Wei Zhao ,  Wenbo Dong ,  Yutao Gong ,  Xuan Wang ,  Francis T. Caruso

IPC: A62B27/00 ,  A61M16/00 ,  G06T7/11 ,  G06T17/20

CPC classification number: A62B27/00 ,  G06T7/11 ,  G06T17/205 ,  A61M2016/0015 ,  G06T2207/10048

Abstract: A fit detection system for a respiratory protection device is presented that includes an infrared camera that captures an image sequence of a user wearing the respiratory protection device. The system also includes a temperature change detector that analyzes images in the image sequence and detects a temperature change profile of the respiratory protection device. The system also includes a communication component that communicates a fit indication based on the detected temperature change profile.