Monitoring the stress build-up in dental cements: a novel optical characterization technique
It is well known that during the curing of dental cements, polymerization shrinkage induces unacceptable stresses, which can result into cracks and an over-sensitivity of the teeth. We demonstrate tha...
Speckle technologies and measurement of retinal visual acuity in cataract patients
Special features of speckle-modulated laser fields arising at in vitro measurements of different types of human cataractous lenses have been investigated experimentally. Computer analysis of digital i...
Thephysiology and pathology of the ocular microcirculation is of interestin several prevalent eye diseases. Quantification of blood flow inocular tissues at high temporal and spatial resolution, essential forthe early detection of alterations during the disease process, requireshighly sensitive measurement techniques such as laser Doppler flowmetry (LDF).Spatial resolution is important when attempting to measure blood flowin tissue layers at different depths and can be increasedby reducing the probing laser's spot size and using detectorswith very small apertures, however, at the expense of lowerDoppler signal-to-noise ratio and greater variability of the measurements. Toimprove LDF signal-to-noise, while retaining the increased spatial resolution ofsmall measuring volumes, a multi- channel approach was undertaken. Anew LDF analysis card was designed using a TMS320C31 digitalsignal processor providing independent LDF analysis of up to 4analog input channels. Two cards are used in parallel toanalyze the output signals of a compound 7-channel detector. Analysisresults of all channels are continuously uploaded to a PCwhich averages the channels and provides the user interface.
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