{"paper":{"title":"A high-precision mechanical absolute-rotation sensor","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.geo-ph"],"primary_cat":"physics.ins-det","authors_text":"Charles A. Hagedorn, Jens H. Gundlach, Krishna Venkateswara, Matthew D. Turner, Trevor Arp","submitted_at":"2014-01-16T18:57:48Z","abstract_excerpt":"We have developed a mechanical absolute-rotation sensor capable of resolving ground rotation angle of less than 1 nrad$/\\sqrt{\\text{Hz}}$ above $30$ mHz and 0.2 nrad$/\\sqrt{\\text{Hz}}$ above $100$ mHz about a single horizontal axis. The device consists of a meter-scale beam balance, suspended by a pair of flexures, with a resonance frequency of 10.8 mHz. The center of mass is located 3 $\\mu$m above the pivot, giving an excellent horizontal displacement rejection of better than $3\\times10^{-5}$ rad/m. The angle of the beam is read out optically using a high-sensitivity autocollimator. We have a"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1401.4412","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}