Why reflectance accuracy matters
A LiDAR or camera calibration board converts measured return intensity into reflectance. If the board's true reflectance deviates from its catalog value, every calibrated number inherits that error. Traceable, per-board factory reports are the only reliable defense — nominal values are a starting point, not a guarantee.
Reflectance steps
Multi-step boards (typically 10/50/90%) verify response across the dynamic range in a single pass. Low-reflectance steps (5–10%) stress the sensor's noise floor; high steps (80–97%) check saturation and linearity. Choose steps that bracket your expected target returns.
Wavelength coverage and flatness
Automotive LiDAR works at 850, 905, 940 and 1550 nm; multispectral cameras span 400–1700 nm. A coating rated 250–2500 nm covers both with margin. Flatness (typically ≤±2% across the band) matters as much as peak reflectance — a spike at the laser line tells you nothing about neighboring bands.
Lambertian behavior
Real targets are scanned at oblique incidence. A near-Lambertian coating keeps returned intensity stable up to ~60° incidence, with deviation angle ≤5° in practice. Specular-dominant coatings make calibrated reflectance drift with viewing geometry.
Field durability
For outdoor campaigns, check the temperature range (−40 °C to +85 °C for the HX-MRT-P4M panel) and substrate rigidity. Aluminum-backed 3 mm panels hold flatness better than film-on-foam constructions.
The HX-MRT series covers 1–97% reflectance from 250–2500 nm with per-board reports; our engineers can recommend a configuration for your sensor and range.