Isothiocyanato tolane liquid crystals exhibit a high birefringence and relatively low viscosity. The phase transition temperatures, birefringence and visco-elastic coefficient of several high birefringence isothiocyanato tolane compounds are evaluated. Using these compounds, several eutectic mixtures were formulated. These new mixtures exhibit a wide nematic range, high birefringence (>0.4) and low viscosity.
A fiber optical ranging sensor used in laser proximity fuze is described in this paper. In the fuze, pulse laser diode (LD) is used as light source and trigger signal is generated by comparing the reflected light pulses with the reference pulses by a correlator after they were converted into electric signals by PIN photodiodes. Multi-mode fibers and integrated optical devices are used in the system so that the structure can be more compact. Optical fiber delay line is used to offer precise delay time for reference channel.
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