Michelson interferometer for precision angle measurement

Abstract

An angle-measuring technique based on an optical interferometer is reported. The technique exploits a Michelson interferometric configuration in which a right-angle prism and a glass strip are introduced into a probe beam. Simultaneous rotation of both components along an axis results in an optical path difference between the reference and the probe beams. In a second arrangement two right-angle prisms and glass strips are introduced into two beams of a Michelson interferometer. The prisms and the strips are rotated simultaneously to introduce an optical path difference between the two beams. In our arrangement, optimization of various parameters makes the net optical path difference between the two beams approximately linear for a rotation as great as +/-20 degrees . Results are simulated that show an improvement of 2-3 orders of magnitude in error and nonlinearity compared with a previously reported technique.

Single Photon Interference Experiments in a Sagnac-type Mach-Zehnder Interferometer

“…정밀측정은 기초과학 및 응용기술 분야에서 가장 중요한 주제중의 하나이며, 미세한 길이 변화를 가장 정밀하게 측정 할 수 있는 대표적인 방법은 간섭계를 이용하는 것이다 [1][2][3] . 간섭계는 빛이 진행하는 두 경로의 길이차이에 따라 발생하 는 간섭무늬를 측정하여 입사하는 빛의 특성 측정이나 광경 로 상에 놓인 매질의 굴절률, 두께 등의 광학적인 특성을 평 가하는데 많이 이용된다 [4][5][6] . 간섭계를 구성하는데 있어서 가 장 중요한 것은 미세한 광학계의 정렬과 더불어 간섭계의 두 경로 사이의 상대적인 위상이 안정되게 유지되어야 한다 [7][8][9] .…”

A Novel 2D Micro-Displacement Measurement Method Based on the Elliptical Paraboloid

“…Under certain conditions, the principles of angle measurement are also applicable to displacement measurement. Conventionally, the three main optical methods for angle measurement with high resolution and accuracy are: interferometers, internal-reflection and autocollimators [4][5][6][7][8]. An interferometer utilizes phase information to measure angular and linear displacement with high signal-to-noise ratio and high resolution [9].…”

Large angular range carousel interferometer for spectroscopic applications

“…Angle measurement techniques are important in optical interferometry, optical processing, metrology and spectroscopy [1][2][3][4][5][6][7][8][9][10][11]. In these techniques optical path difference (OPD) at the output port is created using assembly of rotating mirrors which is inherently a nonlinear function of rotation.…”