Patent ID: 8830475
Filing Date: 2014-09-09
Classification: G01J

Abstract:
1. An interferometer, comprising: a light source, which is configured to emit a light beam; a reflective element having a surface, wherein the travelling direction of the light beam and the surface of the reflective element forms an included angle θ; and a photodetector, which is configured to be substantially perpendicular to the reflective element, and is used in detecting a light signal; wherein, the light beam is halved by the reflective element into a first light beam travelling by the included angle θ and a second light beam reflected off the surface of the reflective element, the first light beam and the second light beam intersect each other to form an interferogram on the photodetector, the photodetector detects the interferogram, the first light beam and the second light beam have an intersecting angle Φ between each other, and it is substantially Φ=2θ.