On-line micro formation sensor

Details On-line micro formation sensor On-line micro formation sensor

G - Physics

01

N

G01N 21/89 (2006.01) G01N 21/86 (2006.01) G01N 21/59 (2006.01)

Patent

CA 2080586

An optical scanner includes a light source (39) which directs a beam of light at a web of moving paper whereby the beam of light is transmitted through the web of moving paper. The transmitted beam (43) is split by a beam splitter (19) to provide a first split beam (44) travell- ing in a machine direction and a second split beam (45) travelling in a cross-machine direction. The split beams are received by charge-coupled device linear arrays (15, 19) which provide analog signals having magnitudes pro- portional to the magnitude of light intensity of the split beams. The analog signals are fed to analog-to-digital converters which provide digital data at the output. The digital data is then used to compute paper formation de- scriptors including paper mass variation, floc size statis- tics and histogram, Fourier power spectra and paper anis- otropy.

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