A careful analysis demonstrated that when optical beams propagated with the wave vector parallel to the some orientations in biaxial crystals, they would not exhibit the first order thermal induced static phase retardation.

This paper explains some problems encountered in the practical measurement using Virtual Instruments developed by LabVIEW,such as phase delay,noise,multitasking and ex-ecution,continuous analog output &input and so on.

The influence of carrier phase delay on demodulation output is corrected.

The simple method research for measuring the phase retardation of wave-plates;

Two-dimensional measurement for optical phase retardation;

Normal acceleration is provided by aerodynamic force,which is restricted by flight height and velocity;Orbit-pulse-control is very different in that it provides normal acceleration without delay,and response time is reduced by one order of magnitude;Attitude-pulse-control behaves 180o phase lag at natural frequency of the missile body,however,the phrase lag of o.

Comparison and analysis of several methods for measuring waveplate retardation;

The relation between the transmitting ratio (or retardation) and ineident angle is given, and the property of Wollaston prism in an imaging system is also presented.