(1) With the compensator in place any optical path difference arises from the actual path difference.

(2) The stability of micro - birefringence optical path difference measuring system based on electro - optic modulation method is studied.

(3) We can get current optical path difference or pulse delay from the spectrum graph directly.

(4) They mean the existence of the additional optical path difference when two beams of laser transit along two opposite directions in the photorefractive crystal.

(5) The nonlinear problem of optical path difference (OPD) of rotating Fourier transform spectrometer universally exists, produced by the rotation of rotating mirror.

(6) In the new method, the spectrum measured value was firstly normalized to eliminate the intensity modulation, and an initial value of Optical Path Difference (OPD) was calculated by extremum method.

(7) Three conditions are considered together and conclude the selective principle of fixed optical path difference.

(8) Theorem of plane stress-optical was used to calculate the optical path difference of each point.

(9) In this experiment, the known delay, which is used as time criteria for calibration of instrument, was generated by the relative optical path difference of Michelson interference light path.

(10) The resolution of the laser interferometer is improved by using optical path difference doubling technique.

(11) In experiment, excess fraction method was introduced into the measurement of the optical path difference.

(12) An adaptive phase shifting interferometry, which is insensitive to the uniform optical path difference induced by environment vibration and air turbulence, is studied.

(13) With the method, the rays' lateral displacements, distance between two output rays and optical path difference can be computed precisely for a certain wedge type fiber optical isolator.

(14) Spectral resolution of optical fiber Fourier transform spectrometer depends on maximum optical path difference(OPD).

(15) The sensing signal is detected by means of compensating the optical path difference of the two orthogonal polarization modes by two arms path difference of Michelson interferometer.

(16) The effect of the incident angle on the optical path difference, state of polarization and interference fringes of the system is deduced in detail.

(17) When common Michelson interferometer is used for measuring air refractive index, there is a major problem that the optic path difference is so large that the fringes is to close too count.

(18) The original phase of the interferogram is changed slowly or rapidly with the optical path difference changed, and the phase error is different too.

(19) The experiments show that the positioning accuracy of extrapolation method for zero optical path difference point of fiber quasi-white interference signal is less than 0.5 interference fringes.

(20) It can basically reflect the additional viscosity pressure drop due to flow path difference and additional inertial pressure drop due to high speed convergent flow.

(21) The main polarization mode and coupling mode in PM fiber has some optical path difference because of internal birefringence.