{"artifact_id":"L1-113","layer":"L1","title":"Phased-Array Ultrasonic Testing (PAUT)","domain":"Industrial Inspection","sub_domain":"Electronically steered ultrasonic NDT","physics_fingerprint":{"L_DAG":4.0,"title":"Phased-Array Ultrasonic Testing (PAUT)","domain":"Industrial Inspection","carrier":"acoustic","primitives":["L.emit.acoustic_pulse","S.scan.beam","L.beamform","L.time_of_flight","int.temporal"],"sub_domain":"Electronically steered ultrasonic NDT","noise_model":"gaussian","problem_class":"linear_inverse","solution_space":"2D_acoustic_reflectivity","difficulty_delta":5,"integration_axis":"temporal","sensing_mechanism":"phased_array_ultrasonics"},"observable_profile":{"metric":"PSNR_dB","regime":"Existence of the recovered 2D acoustic reflectivity is guaranteed within the declared Omega bounds. Uniqueness holds on the measurement-supported subspace; out-of-support modes are controlled by the declared priors. Stability is moderately conditioned (kappa_eff ~= 15); wedge_coupling dominates the stability cliff; surface_curvature 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":{"f_MHz":5,"SNR_dB":20,"N_angles":41,"range_mm":50,"N_elements":64,"wedge_coupling":1.0,"surface_curvature":0.0,"sound_speed_uncertainty":0.0},"input_format":"measurement_only","problem_class":"phased_array_ut","forward_operator":"phased_array_ut_forward","epsilon_fn_center":"24.0"},"omega_bounds":{"f_MHz":[0.5,25],"SNR_dB":[0.0,30.0],"N_angles":[11,181],"range_mm":[5,500],"N_elements":[16,256],"grain_noise":[0.0,0.3],"wedge_coupling":[0.3,1.0],"surface_curvature":[0.0,0.5],"sound_speed_uncertainty":[0.0,0.05]},"epsilon_bounds":{"psnr_db":[5.0,40.0]},"allowed_problem_classes":["phased_array_ut"],"allowed_omega_dimensions":["N_elements","N_angles","f_MHz","range_mm","SNR_dB","wedge_coupling","surface_curvature","sound_speed_uncertainty","wedge_coupling","surface_curvature","sound_speed_uncertainty","grain_noise"],"allowed_forward_operators":["phased_array_ut_forward"]},"hardness_fn":{"type":"epsilon_fn","delta":5,"kappa":300,"metric":"PSNR_dB"},"initiator_dataset":[{"name":"primary","weight":1.0,"ipfs_cid":null,"license_hash":null}],"status":"testnet","staked_pwm":0.0,"chain_hash":"0x04b9ce328cccc779c8cf7a86aeb316631fbee998d4028e1e77906c41921f0fdd","chain_tx_hash":"0x1144f8a7e13835f72ab1069eee668feab474ebf3f871988bf68365b4e3aa68c8","chain_block":41554199}