{"artifact_id":"L1-114","layer":"L1","title":"Eddy-Current Testing (near-surface metallic defect detection)","domain":"Industrial Inspection","sub_domain":"Electromagnetic induction NDT","physics_fingerprint":{"L_DAG":3.2,"title":"Eddy-Current Testing (near-surface metallic defect detection)","domain":"Industrial Inspection","carrier":"radio_wave","primitives":["L.induce_eddy_current","L.secondary_field","D.coil_impedance","int.spatial"],"sub_domain":"Electromagnetic induction NDT","noise_model":"gaussian","problem_class":"nonlinear_inverse","solution_space":"2D_conductivity_map","difficulty_delta":3,"integration_axis":"spatial","sensing_mechanism":"eddy_current_impedance"},"observable_profile":{"metric":"PSNR_dB","regime":"Existence of the recovered 2D conductivity map is guaranteed within the declared Omega bounds. Uniqueness is local rather than global (non-convex landscape); convergence depends on initialisation and priors. Stability is moderately conditioned (kappa_eff ~= 10); lift_off_variation dominates the stability cliff; conductivity_variation and the remaining mismatch parameters contribute higher-order bias terms. Additive gaussian thermal/electronic noise sets the irreducible data-fidelity floor, while mild Tikhonov or analytic inversion is sufficient at the nominal Omega point.","secondary":"SSIM"},"size_tiers":{"center_spec":{"omega":{"H":256,"W":256,"f_kHz":100,"SNR_dB":25.0,"probe_tilt":0.0,"lift_off_mm":0.5,"lift_off_variation":0.0,"conductivity_variation":0.0},"input_format":"measurement_only","problem_class":"eddy_current","forward_operator":"eddy_current_forward","epsilon_fn_center":"25.0"},"omega_bounds":{"H":[64,2048],"W":[64,2048],"f_kHz":[1,10000],"SNR_dB":[0.0,40.0],"probe_tilt":[0.0,0.1],"edge_effect":[0.0,0.3],"lift_off_mm":[0.1,10.0],"lift_off_variation":[0.0,0.5],"conductivity_variation":[0.0,0.3]},"epsilon_bounds":{"psnr_db":[5.0,40.0]},"allowed_problem_classes":["eddy_current"],"allowed_omega_dimensions":["H","W","f_kHz","lift_off_mm","SNR_dB","lift_off_variation","conductivity_variation","probe_tilt","lift_off_variation","conductivity_variation","edge_effect","probe_tilt"],"allowed_forward_operators":["eddy_current_forward"]},"hardness_fn":{"type":"epsilon_fn","delta":3,"kappa":200,"metric":"PSNR_dB"},"initiator_dataset":[{"name":"primary","weight":1.0,"ipfs_cid":null,"license_hash":null}],"status":"testnet","staked_pwm":0.0,"chain_hash":"0x78c128f1be5e55258ceb95273440343eaf9642fe82d1a703b459db13149524af","chain_tx_hash":"0x487b8f5c2ff8aab9fb21450660ba841b2bae9d83f6fd3dfe70f062e9ae2f1ec0","chain_block":41554199}