公开(公告)号：US20250116591A1

公开(公告)日：2025-04-10

申请号：US18865650

申请日：2023-05-12

Applicant: AALTO UNIVERSITY FOUNDATION SR

Inventor： Mikael MIETTINEN ,  Tuomas TIAINEN ,  Valtteri VAINIO ,  Raine VIITALA

IPC: G01N15/08 ,  G01N33/34

Abstract: A device for measuring porosity and/or gas permeability of a sheet of material (9) comprises a measurement head comprising a body part (1) having a measurement face to be set towards the sheet of material, the body part comprising, on its measurement face, a first indentation defining a control volume (3) and a sealing arrangement (2, 5, 6, 7, 8) surrounding the first indentation to seal the control volume, and a control flow channel (11) forming a flow connection between the control volume and the outside of the body part for controlling the pressure in the control volume to create a pressure difference across the sheet of material to be measured. The sealing arrangement comprises a first aerostatic bearing for forming a contactless sealing between the body part (1) and the sheet of material (9) to be measured.

公开(公告)号：US20220152711A1

公开(公告)日：2022-05-19

申请号：US17606142

申请日：2020-04-24

Applicant: Aalto University Foundation sr

Inventor： Petri KUOSMANEN ,  Raine VIITALA ,  Valtteri VAINIO

IPC: B23B31/36

Abstract: Fastening an object onto a lathe, such that the location of the centre of rotation of the object may be adjusted relative to the centre of the lathe axis, wherein the centre of rotation of the object relative to the centre of the lathe may be displaced steplessly and biaxially, according to a predetermined calculation, without removing the object from the chuck.