{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:O5ATKR5P5TYR6BQ6Y2LXPDVQVY","short_pith_number":"pith:O5ATKR5P","canonical_record":{"source":{"id":"1807.08682","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2018-07-20T03:50:27Z","cross_cats_sorted":["physics.optics"],"title_canon_sha256":"4ae687f1aacaf4356436403a595d736f776ae0e24d750167a3dab001a4f3bba6","abstract_canon_sha256":"762aa9028144adab8a0127458ea6038a09d4ae9154f49f4411c7bfce82084e7e"},"schema_version":"1.0"},"canonical_sha256":"77413547afecf11f061ec697778eb0ae3bba4d118aeaa992119253917915efb2","source":{"kind":"arxiv","id":"1807.08682","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1807.08682","created_at":"2026-05-17T23:55:44Z"},{"alias_kind":"arxiv_version","alias_value":"1807.08682v2","created_at":"2026-05-17T23:55:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1807.08682","created_at":"2026-05-17T23:55:44Z"},{"alias_kind":"pith_short_12","alias_value":"O5ATKR5P5TYR","created_at":"2026-05-18T12:32:43Z"},{"alias_kind":"pith_short_16","alias_value":"O5ATKR5P5TYR6BQ6","created_at":"2026-05-18T12:32:43Z"},{"alias_kind":"pith_short_8","alias_value":"O5ATKR5P","created_at":"2026-05-18T12:32:43Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:O5ATKR5P5TYR6BQ6Y2LXPDVQVY","target":"record","payload":{"canonical_record":{"source":{"id":"1807.08682","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2018-07-20T03:50:27Z","cross_cats_sorted":["physics.optics"],"title_canon_sha256":"4ae687f1aacaf4356436403a595d736f776ae0e24d750167a3dab001a4f3bba6","abstract_canon_sha256":"762aa9028144adab8a0127458ea6038a09d4ae9154f49f4411c7bfce82084e7e"},"schema_version":"1.0"},"canonical_sha256":"77413547afecf11f061ec697778eb0ae3bba4d118aeaa992119253917915efb2","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:55:44.213160Z","signature_b64":"2Jlo423TnSKH7JKJu7r/3U8xwzQBDvHNGVT1GiNXkOp029g8JzZvZJ8IL5KXKdwwWyFVZW9X+3UXwqz/eb1KAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"77413547afecf11f061ec697778eb0ae3bba4d118aeaa992119253917915efb2","last_reissued_at":"2026-05-17T23:55:44.212269Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:55:44.212269Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1807.08682","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:55:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xDR0bVoHXtePEq01AtDrFZ6s3vMJpD8F7moI9GHHGnxcS15YhMxmu828gzzxTEyePTf2EvxU1lj1LcW84VmwDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T06:16:02.505142Z"},"content_sha256":"068d2fab0b62297c7c6c1884ceb81a219a9417838f6d3e27ba086ea6a00a4947","schema_version":"1.0","event_id":"sha256:068d2fab0b62297c7c6c1884ceb81a219a9417838f6d3e27ba086ea6a00a4947"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:O5ATKR5P5TYR6BQ6Y2LXPDVQVY","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Thermal-emission measurements near room temperature using Fourier-transform infrared spectroscopy","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.optics"],"primary_cat":"physics.ins-det","authors_text":"Alireza Shahsafi, Chenghao Wan, Graham Joe, Jad Salman, Mikhail A. Kats, Patrick J. Roney, Yuzhe Xiao, Zhaoning Yu","submitted_at":"2018-07-20T03:50:27Z","abstract_excerpt":"Accurate characterization of thermal emitters can be challenging due to the presence of background thermal emission from components of the experimental setup and the surrounding environment. This is especially true for an emitter operating close to room temperature. Here, we explore characterization of near-room-temperature thermal emitters using Fourier-transform infrared (FTIR) spectroscopy. We find that the thermal background arising from optical components placed between the beam splitter and the detector in an FTIR spectrometer appears as a \"negative\" contribution to the Fourier-transform"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1807.08682","kind":"arxiv","version":2},"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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:55:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MBbpURyRhKSepGIGrvUyqCsF9bgtEfMcy3UK7LttiYIqbfpSGumXUDc1y02f+nujVJ5s6CEZsIMFnNR3etrFDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T06:16:02.505529Z"},"content_sha256":"7684e0d142227c0305a2f2d9af747398c65690eb881743a8264156ad10507ce7","schema_version":"1.0","event_id":"sha256:7684e0d142227c0305a2f2d9af747398c65690eb881743a8264156ad10507ce7"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/O5ATKR5P5TYR6BQ6Y2LXPDVQVY/bundle.json","state_url":"https://pith.science/pith/O5ATKR5P5TYR6BQ6Y2LXPDVQVY/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/O5ATKR5P5TYR6BQ6Y2LXPDVQVY/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-27T06:16:02Z","links":{"resolver":"https://pith.science/pith/O5ATKR5P5TYR6BQ6Y2LXPDVQVY","bundle":"https://pith.science/pith/O5ATKR5P5TYR6BQ6Y2LXPDVQVY/bundle.json","state":"https://pith.science/pith/O5ATKR5P5TYR6BQ6Y2LXPDVQVY/state.json","well_known_bundle":"https://pith.science/.well-known/pith/O5ATKR5P5TYR6BQ6Y2LXPDVQVY/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:O5ATKR5P5TYR6BQ6Y2LXPDVQVY","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"762aa9028144adab8a0127458ea6038a09d4ae9154f49f4411c7bfce82084e7e","cross_cats_sorted":["physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2018-07-20T03:50:27Z","title_canon_sha256":"4ae687f1aacaf4356436403a595d736f776ae0e24d750167a3dab001a4f3bba6"},"schema_version":"1.0","source":{"id":"1807.08682","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1807.08682","created_at":"2026-05-17T23:55:44Z"},{"alias_kind":"arxiv_version","alias_value":"1807.08682v2","created_at":"2026-05-17T23:55:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1807.08682","created_at":"2026-05-17T23:55:44Z"},{"alias_kind":"pith_short_12","alias_value":"O5ATKR5P5TYR","created_at":"2026-05-18T12:32:43Z"},{"alias_kind":"pith_short_16","alias_value":"O5ATKR5P5TYR6BQ6","created_at":"2026-05-18T12:32:43Z"},{"alias_kind":"pith_short_8","alias_value":"O5ATKR5P","created_at":"2026-05-18T12:32:43Z"}],"graph_snapshots":[{"event_id":"sha256:7684e0d142227c0305a2f2d9af747398c65690eb881743a8264156ad10507ce7","target":"graph","created_at":"2026-05-17T23:55:44Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"Accurate characterization of thermal emitters can be challenging due to the presence of background thermal emission from components of the experimental setup and the surrounding environment. This is especially true for an emitter operating close to room temperature. Here, we explore characterization of near-room-temperature thermal emitters using Fourier-transform infrared (FTIR) spectroscopy. We find that the thermal background arising from optical components placed between the beam splitter and the detector in an FTIR spectrometer appears as a \"negative\" contribution to the Fourier-transform","authors_text":"Alireza Shahsafi, Chenghao Wan, Graham Joe, Jad Salman, Mikhail A. Kats, Patrick J. Roney, Yuzhe Xiao, Zhaoning Yu","cross_cats":["physics.optics"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2018-07-20T03:50:27Z","title":"Thermal-emission measurements near room temperature using Fourier-transform infrared spectroscopy"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1807.08682","kind":"arxiv","version":2},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:068d2fab0b62297c7c6c1884ceb81a219a9417838f6d3e27ba086ea6a00a4947","target":"record","created_at":"2026-05-17T23:55:44Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"762aa9028144adab8a0127458ea6038a09d4ae9154f49f4411c7bfce82084e7e","cross_cats_sorted":["physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2018-07-20T03:50:27Z","title_canon_sha256":"4ae687f1aacaf4356436403a595d736f776ae0e24d750167a3dab001a4f3bba6"},"schema_version":"1.0","source":{"id":"1807.08682","kind":"arxiv","version":2}},"canonical_sha256":"77413547afecf11f061ec697778eb0ae3bba4d118aeaa992119253917915efb2","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"77413547afecf11f061ec697778eb0ae3bba4d118aeaa992119253917915efb2","first_computed_at":"2026-05-17T23:55:44.212269Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:55:44.212269Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"2Jlo423TnSKH7JKJu7r/3U8xwzQBDvHNGVT1GiNXkOp029g8JzZvZJ8IL5KXKdwwWyFVZW9X+3UXwqz/eb1KAQ==","signature_status":"signed_v1","signed_at":"2026-05-17T23:55:44.213160Z","signed_message":"canonical_sha256_bytes"},"source_id":"1807.08682","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:068d2fab0b62297c7c6c1884ceb81a219a9417838f6d3e27ba086ea6a00a4947","sha256:7684e0d142227c0305a2f2d9af747398c65690eb881743a8264156ad10507ce7"],"state_sha256":"032559279239509c7c2dc40895daa91da82e14bc3368cbf3ae740bdea1a38b2e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"noNzT2IWB9saIYR9c7jgJxsB99+v5mT1tn+YQOjMQ61b0XaBKDxacZY9K7WNszzB7RwcKCIaqyGUTYvBE7NOBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T06:16:02.508115Z","bundle_sha256":"3302933c25b06ad43d33ebb44ed5f1b13ffdc51a9cfe843a50188aa3098346ac"}}