US 12,064,911 B2
Method and device for measuring a tubular strand
Armin Holle, Achim (DE)
Assigned to Sikora AG, Bremen (DE)
Appl. No. 16/977,227
Filed by Sikora AG, Bremen (DE)
PCT Filed Feb. 26, 2019, PCT No. PCT/EP2019/054703
§ 371(c)(1), (2) Date Dec. 30, 2020,
PCT Pub. No. WO2019/166420, PCT Pub. Date Sep. 6, 2019.
Claims priority of application No. 10 2018 104 705.3 (DE), filed on Mar. 1, 2018.
Prior Publication US 2021/0114278 A1, Apr. 22, 2021
Int. Cl. B29C 48/92 (2019.01); B29C 48/90 (2019.01); B29L 23/00 (2006.01); B29L 31/00 (2006.01); G01B 15/02 (2006.01); G01B 15/04 (2006.01)
CPC B29C 48/92 (2019.02) [B29C 48/903 (2019.02); G01B 15/02 (2013.01); G01B 15/04 (2013.01); B29C 2948/92123 (2019.02); B29C 2948/92152 (2019.02); B29C 2948/92171 (2019.02); B29C 2948/92447 (2019.02); B29C 2948/92857 (2019.02); B29L 2023/00 (2013.01); B29L 2031/731 (2013.01)] 27 Claims
OG exemplary drawing
 
1. A method for measuring a portion of a tubular strand exiting from an extrusion device, the method comprising:
directing electromagnetic radiation from an inside of the tubular strand to an inner side of a tubular strand, wherein the electromagnetic radiation is directed to several measuring regions distributed over the inner side of the tubular strand, wherein the electromagnetic radiation is directed to the inner side of the tubular strand by at least one radiation transmitter positioned in an interior of the tubular strand and rotating about a longitudinal axis of the tubular strand, wherein the electromagnet radiation is radiated from at least one radiation source within a frequency range from 1 GHz to 6000 GHz;
reflecting the electromagnetic radiation off of the tubular strand;
receiving the electromagnetic radiation reflected from the tubular strand by at least one radiation receiver; and
determining a value for at least one of a diameter, a wall thickness, and a deviation in shape of the tubular strand from the received electromagnetic radiation.