Optical path difference of uniaxial crystal and field of view of Lyot filter;

Approximation problem in the optical path difference calculation;

Calculation of the optical path difference and fringe location in polarization interference imaging spectrometer

In order to study the application of modern interfering technology,the method for measuring the zero light path difference in white light interfering in the application of absolute length or displacement measurement is given in this paper.

The theory derive of five-step method for position measurement of zero light path difference in white light interferer system was described.

There is an electric-controlled birefringence in the region with applying voltage, and the light path difference varies with voltages, and, so does the transmittance.

After introducing the spectrometer which is based on the Fresnel-double-mirrors, it s optical-path difference for the on-focus and off-focus points for several different kinds of apertures, and calculate the light intensity and the visibility of the spectrometer were calculated.

The integration of this adjustment thought into the zero light path difference method,which can improve the measurement accuracy,has been applied in me.