Reflectance/Transmittance Calculator

Substitution-method calculator for reflectance and transmittance measurements using integrating spheres, with optional port-loss correction.

Measurement Data
Reflectance Result
Signal ratio S_sample/S_ref
0.8562
Raw reflectance ρ_sample
0.8476
Abridged Optics — v1.0Substitution method assumes identical measurement conditions between reference and sample. Port-loss correction uses the generalized integrating-sphere theory from Goebel (1967).

All information, equations, and calculations have been compiled and verified to the best of our ability. For mission-critical applications, we recommend independent verification of all values. If you find an error, please let us know.