Cavity ringdown strain gauge

Biconical tapered single-mode fiber, which is common in many telecommunications components, offers an alternative sensor to typical optical fiber strain gauges that are susceptible to temperature and pressure effects and require expensive and sophisticated signal acquisition systems. Cavity ringdown spectroscopy, a technique commonly applied to high-sensitivity chemical analysis, offers detection sensitivity advantages that can be used to improve strain measurement with biconical tapers. Combining these two technologies in a spatially extended resonator, we demonstrate a minimum detectable change in ringdown time of 0.08%, corresponding to a minimum detectable displacement of 4.8 nm, and a sensitivity to strain as small as 79 n epsilon/square root(Hz) over a 5-mm taper length.     

TLC-Densitometric Determination of Tenoxicam and Its Degradation Products in Pharmaceutical Preparations and after Hydrolysis in Solutions

JPC – Journal of Planar Chromatography – Modern TLC - A direct, rapid, and sensitive thin-layer chromatography (TLC) method with densitometric detection was developed and validated for...     

TLC-Densitometric Method for Quantification of Oxaprozin and its Degradation Products in Pharmaceutical Preparations

JPC – Journal of Planar Chromatography – Modern TLC - A new, simple and rapid thin-layer chromatographic method with densitometric detection has been developed and validated for...