Introduction / S.M. Vaezi-Nejad -- Recent advances in measurement and instrumentation systems based on optical techniques / S. Hadjiloucas and D.A. Keating -- Recent developments on amplitude, wavelength, phase and polarisation modulating sensors / S. Hadjiloucas and D.A. Keating -- Amorphous semiconductor photoreceptors and X-ray image sensors / S.M. Vaezi-Nejad -- Dielectrophoretic sensors for microbiological applications / D.W.E. Allsopp and W.B. Betts -- Electrically conducting polymers for sensing volatile chemicals / K.C. Persaud and Siswoyo -- Thin film (CIAIPc) phthalocyanine gas sensors / M.E. Azim-Araghi and A. Krier.