The proposed lunar seismometer. (IMAGE)
Caption
Computer-aided design (CAD) model (a) and the top view (b) of the proposed lunar seismometer. The upper mass and pillars are made of aluminum, and the test mass is made of fused silica. The test mass is hung using a single silica fiber with three cubes attached to it. Each cube has two mirrors that monitor the vertical and horizontal motions of the test mass. The golden boxes represent the quasimonolithic component (QMC) cages that contain the optical head; the cages are mounted on the breadboard. The blue disks are BOSEMs. The motion of the mirror cubes is represented using an oblique coordinate system, where r1,2,3 and z1,2,3 represent the displacement of the mirror cube and r1 the unit vector along x. Additionally, rotation Rr1,2,3 without coupling can be indicated by the vertical motion z1,2,3.
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