{"artifact_id":"L1-120","layer":"L1","title":"Scanning Acoustic Microscopy (SAM)","domain":"Industrial Inspection","sub_domain":"High-frequency ultrasonic microscopy for buried interfaces","physics_fingerprint":{"L_DAG":3.3,"title":"Scanning Acoustic Microscopy (SAM)","domain":"Industrial Inspection","carrier":"acoustic","primitives":["L.acoustic_lens","S.scan.raster","L.pulse_echo","int.temporal"],"sub_domain":"High-frequency ultrasonic microscopy for buried interfaces","noise_model":"gaussian","problem_class":"linear_inverse","solution_space":"3D_acoustic_impedance","difficulty_delta":3,"integration_axis":"temporal","sensing_mechanism":"scanning_acoustic_microscopy"},"observable_profile":{"metric":"PSNR_dB","regime":"Existence of the recovered 3D acoustic impedance 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 ~= 10); coupling_fluid_variation 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":{"H":512,"W":512,"Z":64,"f_MHz":100,"SNR_dB":25,"pixel_um":10,"surface_curvature":0.0,"multiple_reflections":0.0,"coupling_fluid_variation":0.0},"input_format":"measurement_only","problem_class":"sam","forward_operator":"sam_forward","epsilon_fn_center":"26.0"},"omega_bounds":{"H":[64,2048],"W":[64,2048],"Z":[16,512],"f_MHz":[10,2000],"SNR_dB":[0.0,40.0],"pixel_um":[0.5,500],"surface_curvature":[0.0,0.3],"multiple_reflections":[0.0,0.3],"water_path_attenuation":[0.0,0.2],"coupling_fluid_variation":[0.0,0.2]},"epsilon_bounds":{"psnr_db":[5.0,40.0]},"allowed_problem_classes":["sam"],"allowed_omega_dimensions":["H","W","Z","f_MHz","pixel_um","SNR_dB","coupling_fluid_variation","surface_curvature","multiple_reflections","coupling_fluid_variation","surface_curvature","multiple_reflections","water_path_attenuation"],"allowed_forward_operators":["sam_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":"0xd3e211b87ec868c236c41128dc2020c1a2f0725d5c591d07f0f3260a5bd80a4e","chain_tx_hash":"0x59bedcf1bb380e6c2178d52f606383d252ca9a8532db92b3b2e26da13489f085","chain_block":41554212}