ESTIMATION OF BASIS WEIGHT OF PAPER: LIGHT TRANSMITTANCE MEASUREMENTS OVER EIGHT ORDERS OF MAGNITUDE OF SPATIAL SCALE |
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| Jukka-Pekka Raunio, Risto Ritala |
- Abstract:
- Basis weight of paper web is an important property for quality management, but rather slow and expensive to measure. It is known that light transmittance is related to basis weight and thus a potential means for estimating the basis weight of paper. The basis weight is of interest in quality management from single fibre scale (0.1 mm) to scale of paper machine control effects scale (more than 10 km). This paper studies the relationship between basis weight and light transmittance, and how the relationship changes over the eight orders of spatial scale magnitude. It was noticed that the correlation is best in fairly small scale such that the large scale variations do not change the relationship but white noise in measurement has been filtered out. In paper measurements noise reduction by filtering is powerful because the interesting information is divided over eight orders of scale magnitude. This means that high resolution results can be transformed to lower resolution measurements almost without any noise.
- Keywords:
- measurement, estimation, basis weight, transmittance images
- Download:
- IMEKO-WC-2009-TC7-132.pdf
- DOI:
- -
- Event details
- Event name:
- XIX IMEKO World Congress
- Title:
Fundamental and Applied Metrology
- Place:
- Lisbon, PORTUGAL
- Time:
- 06 September 2009 - 11 September 2009