Citation:
Jane Hodgkinson, Mark Johnson, and John P. Dakin. Performance of a photothermal detector with turbid liquids. Applied Optics, 2005, Vol. 44, Issue 20, pp. 4360-4367
Abstract:
A closed-cell photothermal detector for aqueous analytes has been evaluated at 254nm and 678nm. The
detector used a water meniscus as a pressure sensor, whose periodic deflection was measured using a low
finesse optical fibre Fabry-Perot interferometer. Performance was compared with a commercial diode-array
spectrometer and found to be similar for absorption measurements in non-turbid samples, but the results
were affected up to 60 times less by scattered light. Finally the photothermal cell was converted into an
integrating cavity using ceramic inserts, showing freedom from scattering related errors at 678nm but a
degradation in performance at 254nm.