Collimated transmittance measurement device

DESCRIPTION

• Optical solution based on optical feedback interferometry (OFI) requiring:
  - Moving or stationary reflecting surface / mirror
  - Laser source
• Transmittance is obtained by processing OFI signals recorded under different conditions:
  - A: Stationary mirror, no light propagation in the sample during test
  - B: Moving mirror, no light propagation in the sample during test
  - C: Stationary mirror, light propagates in the sample during test
  - D: Moving mirror, light propagates in the sample during test
• Power spectrum of OFI signals are post-processed thanks to a digital signal processor to zero order moment from which transmittance is computed
• Absorption µa and scattering µs coefficient can be computed

APPLICATIONS

• Optical material characterization