Abstract

The scattering pattern of laser light is used in the optical sensing of wood density. The shape of the scattering pattern is observed to correlate with the density of 400 µm thick wood slices. Also a diffractive optical element based sensor is used in for determination of the density of 400 µm thick wood samples. A comparison of these measurement techniques is given.

Light scattering by wood fibers

Kari Saarinen and Karri Muinonen
Appl. Opt. 40(28) 5064-5077 (2001)

Sensing of human plasma fibrinogen on polished, chemically etched and carbon treated titanium surfaces by diffractive optical element based sensor

Raimo Silvennoinen, Vladimir Vetterl, Stanislav Hasoň, Heikki Tuononen, Martti Silvennoinen, Kari Myller, Ladislav Cvrček, Jiři Vanek, and Patrik Prachăr
Opt. Express 16(14) 10130-10140 (2008)

Wood’s anomalies and spectral uniformity of focusing diffractive optical elements

Hallvard Angelskår, Ib-Rune Johansen, Matthieu Lacolle, and Aasmund S. Sudbø
Opt. Express 18(16) 17201-17208 (2010)

Diffractive optical element with same diffraction pattern for multicolor light-emitting diodes

Mengzhu Chen, Qixia Wang, Huarong Gu, and Qiaofeng Tan
Appl. Opt. 55(1) 159-164 (2016)

Parallel photopolymerisation with complex light patterns generated by diffractive optical elements

Lóránd Kelemen, Sándor Valkai, and Pál Ormos
Opt. Express 15(22) 14488-14497 (2007)