A calibration technique for frequency domain photothermoacoustics G. M. Spirou, A. Mandelis, I. A. Vitkin and W. M. Whelan Eur. Phys. J. Special Topics, 153 (2008) 491-495 Published online: 12 March 2008 DOI: 10.1140/epjst/e2008-00492-6