title: A fiber-coupled displacement measuring interferometer for determination of the posture of a reflective surface.
abstract: A fiber-coupled displacement measuring interferometer capable of determining of the posture of a reflective surface of a measuring mirror is proposed. The newly constructed instrument combines fiber-coupled displacement and angular measurement technologies. The proposed interferometer has advantages of both the fiber-coupled and the spatially beam-separated interferometer. A portable dual-position sensitive detector (PSD)-based unit within this proposed interferometer measures the parallelism of the two source beams to guide the fiber-coupling adjustment. The portable dual PSD-based unit measures not only the pitch and yaw of the retro-reflector but also measures the posture of the reflective surface. The experimental results of displacement calibration show that the deviations between the proposed interferometer and a reference one, Agilent 5530, at two different common beam directions are both less than ±35 nm, thus verifying the effectiveness of the beam parallelism measurement. The experimental results of angular calibration show that deviations of pitch and yaw with the auto-collimator (as a reference) are less than ±2 arc sec, thus proving the proposed interferometer's effectiveness for determination of the posture of a reflective surface.
authors: Harbin Institute of Technology, D-403 Science Park, 2 Yikuang Street, Harbin 150080, China.
authors: Shuai
authors: S
authors: Mao
authors: Harbin Institute of Technology, D-403 Science Park, 2 Yikuang Street, Harbin 150080, China.
authors: Peng-Cheng
authors: PC
authors: Hu
authors: Harbin Institute of Technology, D-403 Science Park, 2 Yikuang Street, Harbin 150080, China.
authors: Xue-Mei
authors: XM
authors: Ding
authors: Harbin Institute of Technology, D-403 Science Park, 2 Yikuang Street, Harbin 150080, China.
authors: Jiu-Bin
authors: JB
authors: Tan