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Application filed by Valmet Automation IncfiledCriticalValmet Automation Inc
Priority to FI981315ApriorityCriticalpatent/FI108812B/en
Publication of FI981315A0publicationCriticalpatent/FI981315A0/en
Publication of FI981315LpublicationCriticalpatent/FI981315L/en
Application grantedgrantedCritical
Publication of FI108812BpublicationCriticalpatent/FI108812B/en
Investigating Or Analysing Materials By Optical Means
(AREA)
Abstract
The invention concerns an optical measurement method and an apparatus for performing optical measurements. According to the invention, the properties of a moving paper web 2 are measured by means of optical reflection measurement, so as to generate a measurement beam 4a and a reference beam 4b. The measurement beam 4a is reflected from the material being measured. The reference beam 4b is taken along with the measurement beam 4a essentially the same way through a measurement window 7, 8 in a measurement head 1 such that the reference beam 4b travels outside the measurement head 1 with essentially no reflection. The measurement beam 4a and the reference beam 4b are measured by using the same detector 10. <IMAGE>
FI981315A1998-06-091998-06-09
Optical measurement method and apparatus for performing optical measurements
FI108812B
(en)
PROCESS TO DETECT THE PROPERTIES OF A FIELD NEAR LIGHT ADJACENT TO A SAMPLE AREA ON A SURFACE, MICROSCOPY PROCESS AND TUNEL EFFECT MICROSCOPE WITH PHOTON DETECTION
PROCEDURE AND DEVICE FOR CHECKING THE SURFACE ROUGHNESS OF A PIECE, IN PARTICULAR A PIECE WITH A CYLINDRICAL SURFACE THAT HAS UNDERGONE MECHANICAL PROCESSING