公开(公告)号：US3684379A

公开(公告)日：1972-08-15

申请号：US3684379D

申请日：1971-07-06

Applicant: NATIONALE D ETUDES DE RECH AER

Inventor： GIRARD ANDRE J

IPC: G01B9/02 ,  G01J3/453 ,  G01J3/00

CPC classification number: G01J3/4532

Abstract: A composite body of radiation-transparent material, acting as an interferometer, comprises two closely juxtaposed prismatic bars of like refractive index contacting each other along a semireflecting interface which bisects a right angle between two outer bar surfaces. One of these orthogonally adjoining surfaces constitutes an entrance side for incident radiation to be split into two components at the diagonally extending interface, the other of these surfaces representing an exit side for such radiation. The throughgoing radiant component is redirected to the beam-splitting interface and thence to the exit side by a reflector at or just beyond a third prism surface parallel to the entrance side, the reflected component being returned to that interface by another reflector at or just beyond a fourth prism surface which diverges longitudinally from the exit side at a small angle whereby the path lengths of the two components differ in length by amounts varying over the length of the body. In an alternate embodiment, the beam-splitting internal surface and the reflecting surfaces are formed by structural elements separated from one another and from the entrance and exit sides by empty spaces, i.e. air gaps or evacuated zones, with a refractive index n 1.

Abstract translation: 用作干涉仪的辐射透明材料的复合体包括两个具有类似折射率的紧密并置的棱镜条，其沿着将两个外部杆表面之间的直角平分的半反射界面彼此接触。 这些正交邻接表面中的一个构成入射侧，用于入射辐射在对角线延伸的界面处分成两个部件，这些表面中的另一个表示用于这种辐射的出射侧。 通过辐射分量被重定向到光束分离界面，并且然后通过平行于入口侧的第三棱镜表面处或刚好超过第三棱镜表面处的反射器到达出射侧，反射部件在另一个反射器处或刚刚超过另外的反射器返回到该界面 第四棱镜表面以小的角度从出射侧纵向地分开，由此两个部件的路径长度在身体的长度上变化的长度不同。 在替代实施例中，分束内表面和反射表面由结构元件形成，该结构元件由折射率为n = 1的空白空间，即空气间隙或抽空区域从入口侧和出射侧分离。