Establishment of the NIST flashing-light photometric unit

Yoshihiro Ohno; Yuqin Zong

doi:10.1117/12.284086

26 September 1997 Establishment of the NIST flashing-light photometric unit

Yoshihiro Ohno, Yuqin Zong

Proceedings Volume 3140, Photometric Engineering of Sources and Systems; (1997) https://doi.org/10.1117/12.284086
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

There is a need for accurate measurement of flashing lights for the proper maintenance of aircraft anticollision lights. A large variation in the measured intensities of anticollision lights has been a problem, and thus, NIST has undertaken the task to establish flashing-light photometric standards to provide calibration services in this area. A flashing-light photometric unit [lux second, (lx (DOT) s)] has been realized based on the NIST detector-based candela, using four standard photometers equipped with current integrators. Two different approaches have been taken to calibrate these standard photometers: one based on electrical calibration of the current integrator, and the other based on electronic pulsing of a steady-state photometric standard. The units realized using these two independent methods agreed to within 0.2%. The relative expanded uncertainty (k equals 2) of the standard photometers, in the measurement of the white xenon flash, is estimated to be 0.6%. The standard photometers are characterized for temporal response, linearity, and spectral responsivity, to be used for measurement of xenon flash sources of various waveforms and colors. Calibration services have been established at NIST for flashing-light photometers with white and red anticollision lights.

Citation Download Citation

Yoshihiro Ohno and Yuqin Zong "Establishment of the NIST flashing-light photometric unit", Proc. SPIE 3140, Photometric Engineering of Sources and Systems, (26 September 1997); https://doi.org/10.1117/12.284086

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