@article{oai:niigata-u.repo.nii.ac.jp:00001535,
 author = {Dai, Xiaoli and Sasaki, Osami and Greivenkamp, John E. and Suzuki, Takamasa},
 issue = {25},
 journal = {Applied Optics, Applied Optics},
 month = {Sep},
 note = {Based on the idea of measuring small rotation angles with a parallel interference pattern (PIP), a method is developed to measure large rotation angles accurately. Two parallel PIP’s that have different periods are used to measure a rotation angle of an object. The measurement made with a small-period PIP provides a high accuracy, and the measurement made with a large-period PIP provides a wide range. An accurate measurement for wide-range angles is made by combining the two measured values. The accuracy of the phase detection is determined by the periods of two PIP’s. Rotation angles from approximately −30 to 30 arc min can be measured with an accuracy of 0.2 arc sec. Analytical results are supported by experimental results.},
 pages = {6190--6195},
 title = {High accuracy, wide range, rotation angle measurement by the use of two parallel interference patterns},
 volume = {36},
 year = {1997}
}