Two-channel photopic/scotopic luminance meter Optical layout - - PowerPoint PPT Presentation

▶

Dec 13, 2022 255 likes •313 views

Two-channel photopic/scotopic luminance meter Optical layout Off-the-shelf optical components 2 detection channels, weighted by V ( ) and V ( ) respectively Amplifiers: SWIFD (CMI) 2-channel switched integrator amplifier

SLIDE 1

Two-channel photopic/scotopic luminance meter

SLIDE 2

Optical layout

Off-the-shelf optical components
2 detection channels, weighted by V(λ) and V’(λ) respectively

SLIDE 3

Amplifiers: SWIFD (CMI)

2-channel switched integrator amplifier with 20 bit ADC
Controlled by LabVIEW via USB

SLIDE 4

Test results

Lowest measured luminance level: 0.005 cd/m2
Standard deviation of the mean: 1 % with <2 s of

integration

Estimated f’1 for photopic: 1.5 %; scotopic: 5 %
Things to characterize:

– Spectral sensitivity – Linearity – Effects of out-of-field sources – Environment effects (temperature, humidity) – Response to modulated luminance – Polarization – …