these articles discussed some parts of your topics about wood science and spectroscopic, hopefully can help you.

Hi Suresh,

I frequently use fluorescene in failure Analysis of Wood and Wood based materials (see the file attached). A more scientific approach can be found in this publication: https://www.researchgate.net/publication/275969083

Cheers

Dirk

Thesis A Wide Spectral Range Imaging System - Applications in Wood Industry

Consider:

A fluorescence spectroscopic study on wood

KK Pandey, NK Upreti, VV Srinivasan - Wood science and technology, 1998 - Springer

Summary Fluorescence spectroscopy has been suggested as an important tool for

identification of timber (Krishna, Chowdhury 1935; Dyer 1988; Sum et al. 1991).

Study of the effect of photo-irradiation on the surface chemistry of wood

KK Pandey - Polymer Degradation and Stability, 2005 - Elsevier

https://scholar.google.com/scholar?q=fluorescence+spectroscopic+study+on+wood&hl=en&as_sdt=0&as_vis=1&oi=scholart&sa=X&ved=0ahUKEwiJt6Sp6rXOAhXDuhoKHdlMCBMQgQMIGjAA