In this thesis, we characterize and test a new MiM cavity for use in the Bouwmeester Optomechanics group. The cavity seems stable over time, though alignment offers some issues. The tip/tilt...Show moreIn this thesis, we characterize and test a new MiM cavity for use in the Bouwmeester Optomechanics group. The cavity seems stable over time, though alignment offers some issues. The tip/tilt alignment of the membrane was achieved to within 700 arcs eventually however. We also explore the use of finesse measurements to determine the absorbance of our membranes. We conclude that optical ring down measurements are preferable in our system and suspect that the PSG4 membranes have higher absorbance as compared to later generations. We present a scheme to determine the thermal gradient of our membrane in-situ, without any modifications required to the principle of the system. We do find, however, that the measurement is very sensitive to drift of the laser detuning. Finally, we explore the observed short term drift in our mechanical mode frequencies. We suspect the thermal expansion of some part of the system of adding additional strain to the membranes, and in doing so raising their mode frequencies, though the exact pathway remains unclear.Show less
Absorption Spectroscopy has the potential to be an efficient and easy alternative of the current method of analyzing Chlorophyll-a concentrations in water. In this project several challenges are...Show moreAbsorption Spectroscopy has the potential to be an efficient and easy alternative of the current method of analyzing Chlorophyll-a concentrations in water. In this project several challenges are encountered and some overcome in the development of a device that automatically quantifies concentrations through absorbance spectra and can make a difference between Chlorophyll-a and Phaeophytin. The market potential of the product is analyzed and competition is critically assessed.Show less
Chlorophyll-a concentrations are a widely used parameter for analysing and quantifying the quality of surface water. The procedure for determining it is a lengthy chemical process. This report...Show moreChlorophyll-a concentrations are a widely used parameter for analysing and quantifying the quality of surface water. The procedure for determining it is a lengthy chemical process. This report presents an alternative automated process for near-instant chl-a concentration determination through spectral analysis of water samples using quantification of characteristics in transmission signals.Show less
