公开(公告)号：JPH10267859A

公开(公告)日：1998-10-09

申请号：JP5717798

申请日：1998-03-09

Applicant: LUCENT TECHNOLOGIES INC

Inventor： JAKOBSEN CHRISTIAN ,  PEDERSEN FLEMMING ,  PENN LEONARDO M ,  BREWER TRACY E ,  KARP AARNE ,  SMITHGALL DAVID H

IPC: G01M11/00 ,  G01N21/88 ,  G01N21/958

Abstract: PROBLEM TO BE SOLVED: To detect air bubbles, lamination of a layer, etc., by detecting a light coupled to a coat layer when the light coupled to the coat layer along an optical fiber is reflected outward from the optical fiber because of a defect present in the coat layer. SOLUTION: A monochromic coherent light beam 12 is projected to a secondary coat layer 13 of an optical fiber with an angle of 5-30 deg.. A coupling point 17 where the light beam 12 is coupled to the second coat layer 13 of the optical fiber is separated by a predetermined distance from a photodetector 15. Air bubbles included in a primary coat layer 11 and the secondary coat layer 13 and a lamination between the primary coat layer 11 and the optical fiber reflect the light to the photodetector 15. A microprocessor receiving an output from the photodetector 15 processes the output, thereby determining whether the air bubbles or the lamination is present, with transmitting information to a production process.

公开(公告)号：JP2000028481A

公开(公告)日：2000-01-28

申请号：JP12681999

申请日：1999-05-07

Applicant: LUCENT TECHNOLOGIES INC

Inventor： ALOISIO JR CHARLES J ,  BREWER TRACY E ,  PENN LEONARDO M ,  PENN THEATRICE S ,  SIDDIQUI SHAHABUDDIN

IPC: G02B6/00 ,  G01M11/00

Abstract: PROBLEM TO BE SOLVED: To obtain a method and an apparatus in which the position and the size of an ink skip can be detected precisely by a method wherein a photodetector which receives light reflected from the outer surface is provided and a signal processing device which decides whether the photodetector detects a plurality of surface characteristics is provided. SOLUTION: In an apparatus, a light source, a lens system, a photodetector array 9, an amplifier 10, an analog-to-digital converter(ADC) 11, a computer 12 and a voice or vision indicator 13 are provided. The ACD 11 and the computer 12 constitute a processing device which processes a detection signal. The computer 12 generates a reference voltage on the basis of an optical fiber region in which a defect in an ink does not exist. A plurality of samples are obtained by the ADC 11, and their read-out values are averaged so as to be stored in a memory. On the basis of whether a digital signal received by the computer 12 from the ADC 11 is by a decided amount larger or smaller than the reference voltage, it is decided that a surface characteristic such as an ink skip is detected.