title: Full-field heterodyne polariscope with an image signal processing method for principal axis and phase retardation measurements.
abstract: We develop a heterodyne polariscope for measuring the two-dimensional principal axis and phase retardation in a linear birefringence material using novel three-frame and two-frame integrating-bucket methods and a CCD. By using a complex programmable logic device to provide an external trigger to the CCD, integrating buckets with multiple frames are achieved. The advantages of the proposed three-frame and two-frame integrating-bucket methods include a simpler signal processing algorithm based on fewer frames and the elimination of flyback error caused by a sawtooth modulation signal at higher frequencies.
authors.affiliation: National Cheng Kung University, Taiwan. loyl@mail.ncku.edu.tw
authors.forename: Yu-Lung
authors.initials: YL
authors.lastname: Lo
authors.forename: Hung-Wei
authors.initials: HW
authors.lastname: Chih
authors.forename: Cheng-Yen
authors.initials: CY
authors.lastname: Yeh
authors.forename: Tsung-Chih
authors.initials: TC
authors.lastname: Yu