{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:YZUSDCH6PQOY64YOO6DDIN4MM5","short_pith_number":"pith:YZUSDCH6","canonical_record":{"source":{"id":"2605.15941","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"physics.optics","submitted_at":"2026-05-15T13:22:18Z","cross_cats_sorted":[],"title_canon_sha256":"38d18dbdef0c669b7888bcb9b747759935e759732959baa9e0b2a916782650ab","abstract_canon_sha256":"a1ee1bf6d7f93ebf19c298dad026cce6ceebaec6d923a7a0e9f8db0209b0a99e"},"schema_version":"1.0"},"canonical_sha256":"c6692188fe7c1d8f730e778634378c674113c23ae6d893a09932c24a3f268143","source":{"kind":"arxiv","id":"2605.15941","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2605.15941","created_at":"2026-05-20T00:01:45Z"},{"alias_kind":"arxiv_version","alias_value":"2605.15941v1","created_at":"2026-05-20T00:01:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2605.15941","created_at":"2026-05-20T00:01:45Z"},{"alias_kind":"pith_short_12","alias_value":"YZUSDCH6PQOY","created_at":"2026-05-20T00:01:45Z"},{"alias_kind":"pith_short_16","alias_value":"YZUSDCH6PQOY64YO","created_at":"2026-05-20T00:01:45Z"},{"alias_kind":"pith_short_8","alias_value":"YZUSDCH6","created_at":"2026-05-20T00:01:45Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:YZUSDCH6PQOY64YOO6DDIN4MM5","target":"record","payload":{"canonical_record":{"source":{"id":"2605.15941","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"physics.optics","submitted_at":"2026-05-15T13:22:18Z","cross_cats_sorted":[],"title_canon_sha256":"38d18dbdef0c669b7888bcb9b747759935e759732959baa9e0b2a916782650ab","abstract_canon_sha256":"a1ee1bf6d7f93ebf19c298dad026cce6ceebaec6d923a7a0e9f8db0209b0a99e"},"schema_version":"1.0"},"canonical_sha256":"c6692188fe7c1d8f730e778634378c674113c23ae6d893a09932c24a3f268143","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-20T00:01:45.942263Z","signature_b64":"AGFcVRU4LPdKp1/oxg0ongPl789wQgSZaBJs1nZnux3UE1nSCjtFq+/QxUR7ZbV3UKdbjPRnf3S2dGBDhJmrAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c6692188fe7c1d8f730e778634378c674113c23ae6d893a09932c24a3f268143","last_reissued_at":"2026-05-20T00:01:45.941608Z","signature_status":"signed_v1","first_computed_at":"2026-05-20T00:01:45.941608Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2605.15941","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-20T00:01:45Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5RDK5qTsraENJLoq5wHl3CXWSUs134Zf0wHDe+fSLRC9kbUdYYi/9gpm7QkQDHeyIpzY2FTv8dEMEbJMeH0UCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T04:44:06.790512Z"},"content_sha256":"daabefe6b71d2776b8acbfa23b6b01cdf742896d9f11b5b90e4f32ed19adcec6","schema_version":"1.0","event_id":"sha256:daabefe6b71d2776b8acbfa23b6b01cdf742896d9f11b5b90e4f32ed19adcec6"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:YZUSDCH6PQOY64YOO6DDIN4MM5","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Intra-Gauge Rotated Vector Sum (IG-RVS) for Rayleigh Fading Mitigation in Coherent {\\phi}-OTDR Systems","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","headline":"IG-RVS suppresses Rayleigh fading in coherent φ-OTDR by phase-aligning and summing neighboring bins within each gauge length.","cross_cats":[],"primary_cat":"physics.optics","authors_text":"Andr\\'e Richter, Igor Koltchanov","submitted_at":"2026-05-15T13:22:18Z","abstract_excerpt":"We propose Intra-Gauge Rotated Vector Sum (IG-RVS), a DSP-based fading mitigation method for coherent ${\\varphi}$-OTDR. IG-RVS exploits spatial diversity within the gauge length by phase-aligning and coherently summing neighboring bins, thereby suppressing Rayleigh fading while preserving spatial resolution."},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"IG-RVS exploits spatial diversity within the gauge length by phase-aligning and coherently summing neighboring bins, thereby suppressing Rayleigh fading while preserving spatial resolution.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"That accurate phase alignment of neighboring bins is feasible in practice and that their coherent summation will reliably reduce fading amplitude without introducing new phase noise or resolution loss.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"Proposes IG-RVS, a DSP method that phase-aligns and coherently sums neighboring bins within the gauge length to suppress Rayleigh fading in coherent φ-OTDR while preserving spatial resolution.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"IG-RVS suppresses Rayleigh fading in coherent φ-OTDR by phase-aligning and summing neighboring bins within each gauge length.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"73cf03ab8afd795c0350b815bab9595166471b67e5fbe9dfc97c255851efa7da"},"source":{"id":"2605.15941","kind":"arxiv","version":1},"verdict":{"id":"32f106d8-f6b6-48aa-ac80-5a73275961ed","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-19T19:17:25.361139Z","strongest_claim":"IG-RVS exploits spatial diversity within the gauge length by phase-aligning and coherently summing neighboring bins, thereby suppressing Rayleigh fading while preserving spatial resolution.","one_line_summary":"Proposes IG-RVS, a DSP method that phase-aligns and coherently sums neighboring bins within the gauge length to suppress Rayleigh fading in coherent φ-OTDR while preserving spatial resolution.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"That accurate phase alignment of neighboring bins is feasible in practice and that their coherent summation will reliably reduce fading amplitude without introducing new phase noise or resolution loss.","pith_extraction_headline":"IG-RVS suppresses Rayleigh fading in coherent φ-OTDR by phase-aligning and summing neighboring bins within each gauge length."},"integrity":{"clean":false,"summary":{"advisory":0,"critical":1,"by_detector":{"doi_compliance":{"total":1,"advisory":0,"critical":1,"informational":0}},"informational":0},"endpoint":"/pith/2605.15941/integrity.json","findings":[{"note":"Identifier '10.1109/jlt.2015.2449077' is syntactically valid but the DOI registry (doi.org) returned 404, and Crossref / OpenAlex / internal corpus also have no record. The cited work could not be located through any authoritative source.","detector":"doi_compliance","severity":"critical","ref_index":13,"audited_at":"2026-05-19T19:31:06.403776Z","detected_doi":"10.1109/jlt.2015.2449077","finding_type":"unresolvable_identifier","verdict_class":"cross_source","detected_arxiv_id":null}],"available":true,"detectors_run":[{"name":"doi_title_agreement","ran_at":"2026-05-19T19:31:19.038528Z","status":"completed","version":"1.0.0","findings_count":0},{"name":"doi_compliance","ran_at":"2026-05-19T19:31:06.403776Z","status":"completed","version":"1.0.0","findings_count":1},{"name":"ai_meta_artifact","ran_at":"2026-05-19T17:33:44.886953Z","status":"skipped","version":"1.0.0","findings_count":0},{"name":"claim_evidence","ran_at":"2026-05-19T17:01:55.726111Z","status":"completed","version":"1.0.0","findings_count":0}],"snapshot_sha256":"0f16daab002978afcf51dc633a6a544afab276d876bdfce4e72197b62e926f3c"},"references":{"count":15,"sample":[{"doi":"10.1201/9781315119014","year":2017,"title":"A. H. Hartog, An Introduction to Distributed Optical Fibre Sensors, Boca Raton, FL: CRC Press, 2017, DOI: 10.1201/9781315119014","work_id":"f51f0f9e-89c5-47e6-8b70-5ad81a6ab772","ref_index":1,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"10.3390/s20226594","year":2020,"title":"Recent Progress in Distributed Fiber Acoustic Sensing with Φ-OTDR,","work_id":"dccd56d3-4e1f-47b1-800b-b98cadb41787","ref_index":2,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"10.1364/oe.24.000853","year":2016,"title":"Coherent Φ- OTDR based on I/Q demodulation and homodyne detec- tion,","work_id":"45f9a35c-2696-4b6e-959f-6ac906a8d391","ref_index":3,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":null,"title":"The effect of gauge length on axially incident P-waves measured using fibre optic distributed vibration sensing,","work_id":"02180024-f866-4157-ace4-6da1c6afcabe","ref_index":4,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"10.1111/1365-2478.12419","year":null,"title":"https://doi.org/10.1111/1365-2478.12419","work_id":"2912a0c4-a495-4c2e-85c8-7c90ac9f45ca","ref_index":5,"cited_arxiv_id":"","is_internal_anchor":false}],"resolved_work":15,"snapshot_sha256":"56e314c5b4dc6c9532f2ea1f3c4c4bb23e41f96c4ca04e56ed04a5e99e8ad0e0","internal_anchors":0},"formal_canon":{"evidence_count":2,"snapshot_sha256":"e9d08323fd410283a7387e831582580a27373cd82708b1798e6b768288197f8b"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":"32f106d8-f6b6-48aa-ac80-5a73275961ed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-20T00:01:45Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"hQI2a6pZnDxg8efsP+MKXBKBDiiUrI3/8KM9j6qWsWFLgQeT9wM7QhQyx23BIxOfvEL4tySphqPVJ4cIeZW5DA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T04:44:06.791907Z"},"content_sha256":"1ea638141fd8236179f34480d4c3da641fddd1f6ae4b3268cc8f61a0a4eda0c0","schema_version":"1.0","event_id":"sha256:1ea638141fd8236179f34480d4c3da641fddd1f6ae4b3268cc8f61a0a4eda0c0"},{"event_type":"integrity_finding","subject_pith_number":"pith:2026:YZUSDCH6PQOY64YOO6DDIN4MM5","target":"integrity","payload":{"note":"Identifier '10.1109/jlt.2015.2449077' is syntactically valid but the DOI registry (doi.org) returned 404, and Crossref / OpenAlex / internal corpus also have no record. The cited work could not be located through any authoritative source.","snippet":"L. B. Liokumovich, N. A. Ushakov, O. I. Kotov, M. A. Bis- yarin, and A. H. Hartog, \"Fundamentals of optical fiber sensing schemes based on coherent optical time do- main reflectometry: Signal model under static fiber con- ditions,\" Journal ","arxiv_id":"2605.15941","detector":"doi_compliance","evidence":{"doi":"10.1109/jlt.2015.2449077","arxiv_id":null,"ref_index":13,"raw_excerpt":"L. B. Liokumovich, N. A. Ushakov, O. I. Kotov, M. A. Bis- yarin, and A. H. Hartog, \"Fundamentals of optical fiber sensing schemes based on coherent optical time do- main reflectometry: Signal model under static fiber con- ditions,\" Journal of Lightwave Technology, vol. 33, no. 17, pp. 3660–3671, 2015. DOI: 10.1109/JLT.2015.2449077","verdict_class":"cross_source","checked_sources":["crossref_by_doi","openalex_by_doi","doi_org_head"]},"severity":"critical","ref_index":13,"audited_at":"2026-05-19T19:31:06.403776Z","event_type":"pith.integrity.v1","detected_doi":"10.1109/jlt.2015.2449077","detector_url":"https://pith.science/pith-integrity-protocol#doi_compliance","external_url":null,"finding_type":"unresolvable_identifier","evidence_hash":"611fefa75f4e5a195db150e9f6ed2f95310074d4f057f1a64783a278322021aa","paper_version":1,"verdict_class":"cross_source","resolved_title":null,"detector_version":"1.0.0","detected_arxiv_id":null,"integrity_event_id":2733,"payload_sha256":"1fccdea7502b17073781189b9af9af068e208aecbb3864fa6a9f01caded6901a","signature_b64":"AWlb5lHkaGHXWKz4K6m73iDVk2KepcuPoVaOh+HAisoab6vqUSXdLUeJSugQ5X6/UizmHHrdMjv7SgQxPxRVCw==","signing_key_id":"pith-v1-2026-05"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-19T19:32:19Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"iBRVmF9C1m42Cv5WMsA4G8L2GQJnAnZKB+0cOwD72Cw48WBv/e/BVfDUz4GDUxycPR5H+FdY4aw62tzSQJ35Cw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T04:44:06.793475Z"},"content_sha256":"9be1c23102edc185701b2f2cc5bc03be372f5b62e735b1bad5da25d0764af22a","schema_version":"1.0","event_id":"sha256:9be1c23102edc185701b2f2cc5bc03be372f5b62e735b1bad5da25d0764af22a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YZUSDCH6PQOY64YOO6DDIN4MM5/bundle.json","state_url":"https://pith.science/pith/YZUSDCH6PQOY64YOO6DDIN4MM5/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YZUSDCH6PQOY64YOO6DDIN4MM5/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":"2026-05-25T04:44:06Z","links":{"resolver":"https://pith.science/pith/YZUSDCH6PQOY64YOO6DDIN4MM5","bundle":"https://pith.science/pith/YZUSDCH6PQOY64YOO6DDIN4MM5/bundle.json","state":"https://pith.science/pith/YZUSDCH6PQOY64YOO6DDIN4MM5/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YZUSDCH6PQOY64YOO6DDIN4MM5/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:YZUSDCH6PQOY64YOO6DDIN4MM5","merge_version":"pith-open-graph-merge-v1","event_count":3,"valid_event_count":3,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"a1ee1bf6d7f93ebf19c298dad026cce6ceebaec6d923a7a0e9f8db0209b0a99e","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"physics.optics","submitted_at":"2026-05-15T13:22:18Z","title_canon_sha256":"38d18dbdef0c669b7888bcb9b747759935e759732959baa9e0b2a916782650ab"},"schema_version":"1.0","source":{"id":"2605.15941","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2605.15941","created_at":"2026-05-20T00:01:45Z"},{"alias_kind":"arxiv_version","alias_value":"2605.15941v1","created_at":"2026-05-20T00:01:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2605.15941","created_at":"2026-05-20T00:01:45Z"},{"alias_kind":"pith_short_12","alias_value":"YZUSDCH6PQOY","created_at":"2026-05-20T00:01:45Z"},{"alias_kind":"pith_short_16","alias_value":"YZUSDCH6PQOY64YO","created_at":"2026-05-20T00:01:45Z"},{"alias_kind":"pith_short_8","alias_value":"YZUSDCH6","created_at":"2026-05-20T00:01:45Z"}],"graph_snapshots":[{"event_id":"sha256:1ea638141fd8236179f34480d4c3da641fddd1f6ae4b3268cc8f61a0a4eda0c0","target":"graph","created_at":"2026-05-20T00:01:45Z","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":4,"items":[{"attestation":"unclaimed","claim_id":"C1","kind":"strongest_claim","source":"verdict.strongest_claim","status":"machine_extracted","text":"IG-RVS exploits spatial diversity within the gauge length by phase-aligning and coherently summing neighboring bins, thereby suppressing Rayleigh fading while preserving spatial resolution."},{"attestation":"unclaimed","claim_id":"C2","kind":"weakest_assumption","source":"verdict.weakest_assumption","status":"machine_extracted","text":"That accurate phase alignment of neighboring bins is feasible in practice and that their coherent summation will reliably reduce fading amplitude without introducing new phase noise or resolution loss."},{"attestation":"unclaimed","claim_id":"C3","kind":"one_line_summary","source":"verdict.one_line_summary","status":"machine_extracted","text":"Proposes IG-RVS, a DSP method that phase-aligns and coherently sums neighboring bins within the gauge length to suppress Rayleigh fading in coherent φ-OTDR while preserving spatial resolution."},{"attestation":"unclaimed","claim_id":"C4","kind":"headline","source":"verdict.pith_extraction.headline","status":"machine_extracted","text":"IG-RVS suppresses Rayleigh fading in coherent φ-OTDR by phase-aligning and summing neighboring bins within each gauge length."}],"snapshot_sha256":"73cf03ab8afd795c0350b815bab9595166471b67e5fbe9dfc97c255851efa7da"},"formal_canon":{"evidence_count":2,"snapshot_sha256":"e9d08323fd410283a7387e831582580a27373cd82708b1798e6b768288197f8b"},"integrity":{"available":true,"clean":false,"detectors_run":[{"findings_count":0,"name":"doi_title_agreement","ran_at":"2026-05-19T19:31:19.038528Z","status":"completed","version":"1.0.0"},{"findings_count":1,"name":"doi_compliance","ran_at":"2026-05-19T19:31:06.403776Z","status":"completed","version":"1.0.0"},{"findings_count":0,"name":"ai_meta_artifact","ran_at":"2026-05-19T17:33:44.886953Z","status":"skipped","version":"1.0.0"},{"findings_count":0,"name":"claim_evidence","ran_at":"2026-05-19T17:01:55.726111Z","status":"completed","version":"1.0.0"}],"endpoint":"/pith/2605.15941/integrity.json","findings":[{"audited_at":"2026-05-19T19:31:06.403776Z","detected_arxiv_id":null,"detected_doi":"10.1109/jlt.2015.2449077","detector":"doi_compliance","finding_type":"unresolvable_identifier","note":"Identifier '10.1109/jlt.2015.2449077' is syntactically valid but the DOI registry (doi.org) returned 404, and Crossref / OpenAlex / internal corpus also have no record. The cited work could not be located through any authoritative source.","ref_index":13,"severity":"critical","verdict_class":"cross_source"}],"snapshot_sha256":"0f16daab002978afcf51dc633a6a544afab276d876bdfce4e72197b62e926f3c","summary":{"advisory":0,"by_detector":{"doi_compliance":{"advisory":0,"critical":1,"informational":0,"total":1}},"critical":1,"informational":0}},"paper":{"abstract_excerpt":"We propose Intra-Gauge Rotated Vector Sum (IG-RVS), a DSP-based fading mitigation method for coherent ${\\varphi}$-OTDR. IG-RVS exploits spatial diversity within the gauge length by phase-aligning and coherently summing neighboring bins, thereby suppressing Rayleigh fading while preserving spatial resolution.","authors_text":"Andr\\'e Richter, Igor Koltchanov","cross_cats":[],"headline":"IG-RVS suppresses Rayleigh fading in coherent φ-OTDR by phase-aligning and summing neighboring bins within each gauge length.","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"physics.optics","submitted_at":"2026-05-15T13:22:18Z","title":"Intra-Gauge Rotated Vector Sum (IG-RVS) for Rayleigh Fading Mitigation in Coherent {\\phi}-OTDR Systems"},"references":{"count":15,"internal_anchors":0,"resolved_work":15,"sample":[{"cited_arxiv_id":"","doi":"10.1201/9781315119014","is_internal_anchor":false,"ref_index":1,"title":"A. H. Hartog, An Introduction to Distributed Optical Fibre Sensors, Boca Raton, FL: CRC Press, 2017, DOI: 10.1201/9781315119014","work_id":"f51f0f9e-89c5-47e6-8b70-5ad81a6ab772","year":2017},{"cited_arxiv_id":"","doi":"10.3390/s20226594","is_internal_anchor":false,"ref_index":2,"title":"Recent Progress in Distributed Fiber Acoustic Sensing with Φ-OTDR,","work_id":"dccd56d3-4e1f-47b1-800b-b98cadb41787","year":2020},{"cited_arxiv_id":"","doi":"10.1364/oe.24.000853","is_internal_anchor":false,"ref_index":3,"title":"Coherent Φ- OTDR based on I/Q demodulation and homodyne detec- tion,","work_id":"45f9a35c-2696-4b6e-959f-6ac906a8d391","year":2016},{"cited_arxiv_id":"","doi":"","is_internal_anchor":false,"ref_index":4,"title":"The effect of gauge length on axially incident P-waves measured using fibre optic distributed vibration sensing,","work_id":"02180024-f866-4157-ace4-6da1c6afcabe","year":null},{"cited_arxiv_id":"","doi":"10.1111/1365-2478.12419","is_internal_anchor":false,"ref_index":5,"title":"https://doi.org/10.1111/1365-2478.12419","work_id":"2912a0c4-a495-4c2e-85c8-7c90ac9f45ca","year":null}],"snapshot_sha256":"56e314c5b4dc6c9532f2ea1f3c4c4bb23e41f96c4ca04e56ed04a5e99e8ad0e0"},"source":{"id":"2605.15941","kind":"arxiv","version":1},"verdict":{"created_at":"2026-05-19T19:17:25.361139Z","id":"32f106d8-f6b6-48aa-ac80-5a73275961ed","model_set":{"reader":"grok-4.3"},"one_line_summary":"Proposes IG-RVS, a DSP method that phase-aligns and coherently sums neighboring bins within the gauge length to suppress Rayleigh fading in coherent φ-OTDR while preserving spatial resolution.","pipeline_version":"pith-pipeline@v0.9.0","pith_extraction_headline":"IG-RVS suppresses Rayleigh fading in coherent φ-OTDR by phase-aligning and summing neighboring bins within each gauge length.","strongest_claim":"IG-RVS exploits spatial diversity within the gauge length by phase-aligning and coherently summing neighboring bins, thereby suppressing Rayleigh fading while preserving spatial resolution.","weakest_assumption":"That accurate phase alignment of neighboring bins is feasible in practice and that their coherent summation will reliably reduce fading amplitude without introducing new phase noise or resolution loss."}},"verdict_id":"32f106d8-f6b6-48aa-ac80-5a73275961ed"}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:daabefe6b71d2776b8acbfa23b6b01cdf742896d9f11b5b90e4f32ed19adcec6","target":"record","created_at":"2026-05-20T00:01:45Z","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":"a1ee1bf6d7f93ebf19c298dad026cce6ceebaec6d923a7a0e9f8db0209b0a99e","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"physics.optics","submitted_at":"2026-05-15T13:22:18Z","title_canon_sha256":"38d18dbdef0c669b7888bcb9b747759935e759732959baa9e0b2a916782650ab"},"schema_version":"1.0","source":{"id":"2605.15941","kind":"arxiv","version":1}},"canonical_sha256":"c6692188fe7c1d8f730e778634378c674113c23ae6d893a09932c24a3f268143","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c6692188fe7c1d8f730e778634378c674113c23ae6d893a09932c24a3f268143","first_computed_at":"2026-05-20T00:01:45.941608Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-20T00:01:45.941608Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"AGFcVRU4LPdKp1/oxg0ongPl789wQgSZaBJs1nZnux3UE1nSCjtFq+/QxUR7ZbV3UKdbjPRnf3S2dGBDhJmrAg==","signature_status":"signed_v1","signed_at":"2026-05-20T00:01:45.942263Z","signed_message":"canonical_sha256_bytes"},"source_id":"2605.15941","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9be1c23102edc185701b2f2cc5bc03be372f5b62e735b1bad5da25d0764af22a","sha256:daabefe6b71d2776b8acbfa23b6b01cdf742896d9f11b5b90e4f32ed19adcec6","sha256:1ea638141fd8236179f34480d4c3da641fddd1f6ae4b3268cc8f61a0a4eda0c0"],"state_sha256":"ad83f2dcc5c4af7b1643670066bc9a034cc01351b6a09742319f21f80e1555c6"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Ga3unMzDJmP624RT1mmA6dgreLGAhj7j8O3rVnnuiXyKeMo86DZj94qN5yj4xR6q5xGXzrK+oHqS4OKvejEcCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T04:44:06.798372Z","bundle_sha256":"e82f66ca846b45488ac835110939190a921591e33fa7e07754e3afabb5461bd7"}}