Abstract

The procedure and the results of realizing a low-level photometric scale down to 1 × 10⁻⁶ lx with standardized detectors are described. The detectors are two photomultipliers (one of them operated in the photon counting mode) and two operational amplifier/photodiode combinations. The relative spectral sensitivity of these detectors was modified to closely approximate the V(λ) curve, and the absolute monochromatic irradiance sensitivity at 633 nm was determined using self-calibrated Si photodiodes. The estimated uncertainty of the measurement of illuminance using these standardized detectors is about ±1%. A low-level photometric source that can provide illuminance of 1.5 × 10⁻¹ lx−5 × 10⁻⁷ lx or luminance of 3 × 10² cd/m²−2 × 10⁻³ cd/m² has been developed. The repeatability of calibrations of the low-level photometers was ±0.3%.

© 1984 Optical Society of America

National Institute of Standards and Technology detector-based photometric scale

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