The variation laws of mutual coherence function in laser projector with moving diffuser for speckle reduction are
studied based on the partly coherent theory. We take the magnification of lens and its spread function into consideration,
it gives us a method to weigh the speckle reduction and the loss of optical energy while using the moving diffuser for
speckle reduction, and it points out the selection of diffuser slice for laser display.
The film of holographic two-dimensional (2D) photonic crystal is used for the led illumination system. According to the decorative patterns, the structure sizes of 2D photonic crystal and relevant led luminaire have been reasonably designed. Then the master mask of 2D photonic crystal is produced with the method of multiple-beam interference. With the experiment of LED illumination, the results show that it is able to meet the expected decorative patterns of LED illumination. While the master mask is used to copy optical coating of polycarbonate, it will provide a better option for LED decorative illumination under low cost.
An optical system for measurement of the intracellular pH (pHi) in a single living cell by using the fluorescent probe, 5(6)-carboxyfluorescein diacetate (CFDA) and fiber optic nanoprobe was demonstrated in this work. The CFDA probe is used to determine pHi in the yeast, Saccharomyces cerevisiae 97 while fiber optic nanoprobe is used to guide excitation light and receive emission light within a single cell. Experimental results showed that our system had higher detection sensitivity than other standard spectrometer, which is important to single-cell analysis, especially for the microanalysis in a single-cell.
We present a fiber mode converter incorporated fiber-loop ring-down system for strain measurement. The sensing system
consists of a fiber mode converter and a typical fiber-loop ring-down system including a pulsed VCSEL laser diode at
850 nm, multimode fiber couplers, multimode fiber loop, photo-receiver and high-speed data acquisition and signal
processing. The bending multimode fiber-loop ring-down strain sensor is demonstrated with a resolution of 0.28 &mgr;&Vegr; over a
range of 767 &mgr;&Vegr;.
Dual-channel fiber ring down force sensor based on the principle of time division multiplexing is descried. The system
has the capability to interrogate more than two micro bend sensors by using more than one fiber delay line to control the
time of flight of the pulse. The dual-channel fiber ring down force sensor with one fiber delay coil is demonstrated with
high force sensitivities of 183.4ns/N and 163.6ns/N, respectively. Our system has also good linear responses.
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