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. Author manuscript; available in PMC: 2011 Apr 6.
Published in final edited form as: Opt Lett. 2010;35(12):2067–2069. doi: 10.1364/OL.35.002067

Fig. 2. Quantifying the optical absorption coefficients of ink.

Fig. 2

(a) Acoustic spectra of PA signals from original and diluted black ink samples. (b) Ratio of the acoustic spectral amplitudes of PA signals from two samples and fitting with the theoretical formula. (c) Fitting result with 7 phantoms (without the covered layer) and 3 samples (with the covered layer). (d) The acoustic spectra measured from the original black ink with and without the covered layer.