{"closest_prior_art":[{"name":"Photoelastic Studies of Filament-Wound Pressure Vessels (1963)","overlap":"Directly applies an adhered, reflective photoelastic layer to filament-wound pressure vessels; vessel strain induces birefringence proportional to principal-strain difference, and a polariscope maps strain direction and magnitude over the coated area.","remaining_difference":"The retained description does not show the proposal's predeclared invalid-boundary rules, continuous bounded ramp protocol, seeded-defect calibration, blinded comparison with sparse gauges, or supplementary-only qualification status.","source_ids":["SRC1"]},{"name":"NASA three-dimensional DIC testing of a COPV","overlap":"Uses high-speed optical systems during hydrostatic testing to obtain full-field displacement and strain, revealing localized and growing principal strain that mounted gauges did not detect.","remaining_difference":"It uses computational image correlation rather than a material birefringent coating and does not establish the proposed fringe-break boundary protocol.","source_ids":["SRC2"]},{"name":"Micro-Measurements PhotoStress coating practice","overlap":"Commercial guidance covers coating sensitivity, curved-surface application, principal-strain-difference fringes, optical observation, spatially localized deformation, coating reinforcement, and temperature effects, including pressure-vessel applications.","remaining_difference":"It does not demonstrate improved composite-shell decisions using the proposal's seeded features, blinded reviewers, repeatability requirements, and non-interpolation rules.","source_ids":["SRC3"]}],"contrastive_claim_falsifier":"The remaining claim is falsified if, on the predeclared subscale trial, blinded reviewers using raw fringe observations do not locate seeded transitions or localization zones more reproducibly than the baseline gauges, or if supposed sharp boundaries fail to repeat across three ramps or track coating, temperature, glare, or adhesion artifacts rather than known features and post-test NDE.","contrastive_claim_remaining":"Only the protocol-specific claim remains: on a bounded curved composite-shell test, predeclared coating-validity regions and non-interpolable fringe-break rules may provide repeatable, decision-relevant localization beyond sparse gauges without presenting artifact-contaminated regions as a continuous strain field. The generic use of a photoelastic coating to map strain over a filament-wound pressure vessel is already directly described.","experiment_id":"eoa_inverse_innovation_exp13_second_slot_policy60_20260806","gates":{"adequate_source_search":{"rationale":"The bounded search covered the proposal directly, historical terms including PhotoStress and birefringent coating, commercial coating practice, pressure-vessel standards, sparse-gauge limitations, full-field optical rivals, and component combinations. Four opened direct sources span ASTM, NASA, Micro-Measurements, and PHMSA.","source_ids":["SRC1","SRC2","SRC3","SRC4"],"status":"PASS"},"bounded_next_test":{"rationale":"A sacrificial shell with known features, three elastic ramps, raw fringe capture, colocated gauges, temperature and coating checks, blinded localization, and post-test NDE is finite and capable of rejecting the narrow remaining claim. Coating sensitivity, curvature, reinforcement, and thermal dependence require pretest calibration.","source_ids":["SRC2","SRC3"],"status":"PASS"},"distinct_testable_claim":{"rationale":"Although the underlying coating intervention substantially collides with 1963 vessel work, the narrower claim concerning explicit non-interpolable boundaries, repeatability, and superior blinded localization on a curved composite shell is distinguishable from what the retained sources demonstrate and has observable failure criteria.","source_ids":["SRC1","SRC2","SRC3"],"status":"PASS"},"no_obvious_safety_or_authority_stop":{"rationale":"No obvious stop bars the proposed supplementary trial if it remains on a sacrificial article within an approved elastic envelope under the designated safety officer and structural-test authority. PHMSA's formal COPV requalification framework confirms that substitution for required proof, inspection, or authorized NDE is authority-controlled; the proposal expressly forbids such substitution.","source_ids":["SRC3","SRC4"],"status":"PASS"},"supported_problem":{"rationale":"NASA's COPV hydrostatic tests found localized strain and large principal-strain growth that mounted gauges did not detect, directly supporting the visibility problem. The result supports sparse-point coverage limitations, though it does not prove that every qualification program suffers consequential misses.","source_ids":["SRC2"],"status":"PASS"}},"prior_art_disposition":"ESTABLISHED_PRACTICE","problem_evidence":{"finding":"The problem is visible: full-field COPV testing has observed localized strain where gauges were absent and principal-strain growth that mounted gauges failed to detect. However, the proposed core remedy is not new at this coarse level because photoelastic coating of filament-wound pressure vessels was reported in 1963, and commercial guidance treats pressure vessels as an application.","source_ids":["SRC1","SRC2","SRC3"],"status":"SUPPORTED"},"research_id":"eoa_inverse_innovation_exp13_light_screen_20260806","schema_version":1,"screen_id":"E13P078","screen_survival":false,"search_lanes":{"component_combination":{"no_result_note":null,"queries":["composite pressure vessel sparse strain gauges miss local strain full field","composite shell buckling strain gauges full field optical measurement","birefringent coating pressure vessel full field strain"],"source_ids":["SRC1","SRC2","SRC3"]},"direct_problem_and_intervention":{"no_result_note":null,"queries":["photoelastic coating composite pressure vessel strain buckling full field","\"photoelastic coating\" \"pressure vessel\"","PhotoStress composite pressure vessel coating strain"],"source_ids":["SRC1","SRC2","SRC3"]},"products_practices_and_standards":{"no_result_note":null,"queries":["photoelastic coating method strain optical coating Tech Note Measurements Group","pressure vessel testing strain gauges composite qualification standard","pressure vessel requalification composite acoustic emission standard"],"source_ids":["SRC3","SRC4"]},"synonyms_and_historical_terms":{"no_result_note":null,"queries":["photoelastic coating composite shell stress analysis birefringent coating","\"photoelastic coatings\" cylinder pressure","10.1520/STP44438S Photoelastic Studies Filament-Wound Pressure Vessels"],"source_ids":["SRC1","SRC3"]}},"sources":[{"claims_supported":["Filament-wound pressure vessels were studied using the Zandman PhotoStress technique by 1963.","A thin special-plastic layer was adhered to the vessel surface with a reflective interface.","Transferred vessel strain produced birefringence proportional to principal-strain difference, permitting polariscope measurement over the coated area."],"publisher":"ASTM International","source_id":"SRC1","source_type":"PRIMARY_RESEARCH","title":"Photoelastic Studies of Filament-Wound Pressure Vessels","url":"https://store.astm.org/stp44438s.html"},{"claims_supported":["Hydrostatic COPV tests used high-speed three-dimensional digital image correlation for full-field displacement and strain.","The optical field showed localized strain where gauges were absent and principal-strain growth that mounted gauges did not detect.","Full-field optical measurement is therefore already an adjacent solution to the sparse-gauge problem."],"publisher":"NASA Technical Reports Server","source_id":"SRC2","source_type":"PRIMARY_RESEARCH","title":"Three-Dimensional Digital Image Correlation of a Composite Overwrapped Pressure Vessel During Hydrostatic Pressure Tests","url":"https://ntrs.nasa.gov/api/citations/20070031571/downloads/20070031571.pdf?attachment=true"},{"claims_supported":["PhotoStress is an established first-party coating and polariscope practice for principal-strain-difference measurement.","Guidance addresses sensitivity, contoured surfaces, pressure vessels, reinforcing effects, expected strain, instrument sensitivity, and temperature dependence.","Coating selection and calibration are necessary because thickness, curvature, material modulus, and temperature can affect results."],"publisher":"Micro-Measurements / Vishay Precision Group","source_id":"SRC3","source_type":"FIRST_PARTY_PRODUCT","title":"How to Select Photoelastic Coatings — Tech Note TN-704","url":"https://www.vishay-measurements.ca/pdf/photostress/tn-704.pdf"},{"claims_supported":["Composite-cylinder requalification is governed by authorized inspection and testing procedures.","PHMSA identifies modal acoustic emission as a specified requalification method for qualifying COPVs and ties its use to ISO-designed vessels or DOT special permits.","A supplementary optical trial cannot independently displace required proof testing, visual inspection, or authorized NDE."],"publisher":"U.S. Department of Transportation, Pipeline and Hazardous Materials Safety Administration","source_id":"SRC4","source_type":"OFFICIAL_STANDARD","title":"Modal Acoustic Emission Examination Specification for Requalification of Composite Overwrapped Pressure Vessels","url":"https://www.phmsa.dot.gov/technical-resources/hazmat-technical-resources/modal-acoustic-emission-mae-examination-specification-for-requalification-of-composite-overwrapped-pressure-vessels-cylinders-and-tubes"}],"world_novelty_boundary":"This bounded screen establishes neither world novelty nor patentability, market size, expert acceptance, or realized value. It found direct historical prior art for the core intervention, but it did not exhaust patents, non-English literature, proprietary qualification procedures, discontinued products, or every protocol-level combination."}