I think that we apply the "famous" Absorbance(A) / reflectance  (R) conversion that is used in spectroscopy which is : A=log 1/R . But I do not claim to be sure of that with respect to your measurements.

From diffuse reflectance spectra you can perform Kubelka Munk transformation to get something related to absorbance

http://nvlpubs.nist.gov/nistpubs/jres/80A/jresv80An4p567_A1b.pdf

Kubelka-Munk is to be preferred over log/1/R). Recently, I included Kubelka-Munk transformation into my free optical spectroscopy Spectragryph. Download from here: http://spectroscopy.ninja

Good morning. Following this discussion i have a doubt respect the transformation between Absorbance and Reflectance. Sometime the conversion formula is written as A = Log(1/R), while sometime A = - log(1/R). The sign "minus" what can change? is better to use the first or the second formula? Following the Lambert-Beer law the formula is A = Log(1/T) where T is the transmittance (i know that in general can be used T or R without distinction). Thanks

Hi there,

Please help me, to convert the absorbance to reflectance from UV DRS data. thx.

For opaque Si sample, i got data in terms of %R ,is this the sample formula applicable for this.

Abs= log10(1/R)