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Indirect Detection of Visual Signals for Emergency Notification

Fire Technology volume 52, pages 1427–1444 (2016)Cite this article

Abstract

Flashing visual signal lights for emergency notification have usually used xenon strobe light sources, which produce very short flashes of light. Photometric performance specifications for these signal lights use the effective intensity as the primary metric. Effective intensity appears to be a suitable metric for characterizing detection of signal lights when directly viewed at or near the line of sight. For the indirect detection of xenon strobe light sources, when the light source is in the far periphery or outside of the field of view and the primary cue of the signal’s flashing is the increase in brightness of adjacent room surfaces, an effective intensity of 15 cd seems to be sufficient. When signal lights produce longer flashes of light than xenon strobe sources, much higher effective intensities are needed for indirect detection, suggesting that effective intensity is poorly correlated with detection performance. A series of human factors experiments confirmed this suggestion. Based on the experimental results, a modified metric for characterizing the indirect detection of visual signals, termed the indirect effectiveness quantity (IEQ), was developed. The IEQ metric may be particularly useful at predicting indirect detection of visual signals with flash durations longer than those of xenon strobe light sources, such as some configurations using light-emitting diodes. Experimental data from the present study suggest that under ambient room illumination of 500 lx, an IEQ value of 750 cd will elicit indirect detection percentages of about 90%, independent of the flash duration.

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References

  1. National Fire Protection Association (2010) NFPA 72: national fire alarm and signaling code. National Fire Protection Association, Quincy

    Google Scholar 

  2. Kravontka SJ (1975) A fire signal system for deaf school children. Fire Technol 11:23–28. doi:10.1007/BF02589998

    Article  Google Scholar 

  3. Thomas I, Bruck D (2010) Awakening of sleeping people: a decade of research. Fire Technol 46:743–761. doi:10.1007/s10694-008-0065-5

    Article  Google Scholar 

  4. Schifiliti RP (1988) Designing fire alarm audibility. Fire Technol 24:181–188. doi:10.1007/BF01041341

    Article  Google Scholar 

  5. International Association of Lighthouse Authorities (2008) IALA Recommendation E-200-4: Marine signal lights, part 4: Determination and calculation of effective intensity. International Association of Lighthouse Authorities, St. Germain-en-Laye

    Google Scholar 

  6. Bullough JD, Skinner NP, Taranta RT (2013) Characterising the effective intensity of multiple-pulse flashing lights. Lighting Res Technol 45:377–390

    Article  Google Scholar 

  7. Bullough JD, Skinner NP (2013) Conspicuity of flashes of light: Interactions between intensity and duration. J Mod Opt 60:1193–1199

    Article  MathSciNet  Google Scholar 

  8. Holmes JG (ed) (1971) The perception and application of flashing lights. University of Toronto Press, Toronto

    Google Scholar 

  9. Illuminating Engineering Society (1964) IES guide for calculating the effective intensity of flashing signal lights. Illuminating Engineering Society, New York

    Google Scholar 

  10. Blondel A, Rey J (1912) The perception of lights of short duration at their range limits. Trans Illum Eng Soc 7:625–662

    Google Scholar 

  11. Bullough JD, Zhu Y, Narendran N (2012) Characteristics of light-emitting diode sources: relevance for visual signal detection. In: Proceedings of the technical working conference on suppression, detection and signaling research and applications (SUPDET), Phoenix, (5–8/03)

  12. Bullough JD, Zhu Y (2012) Performance objectives of light sources used in emergency notification appliances. Fire Protection Research Foundation, Quincy

    Google Scholar 

  13. DeVoss F (1991) Report of research on emergency signaling devices for use by the hearing impaired. Underwriters Laboratories, Northbrook

    Google Scholar 

  14. Rea MS (ed) (2000) IESNA lighting handbook: reference and application. Illuminating Engineering Society, New York

    Google Scholar 

  15. Savage K (2011) Flash pulse width effectiveness in notification appliances. In: Proceedings of the technical working conference on suppression, detection and signaling research and applications (SUPDET), Orlando, (22–25/03)

  16. Kelly DH (1961) Visual responses to time-dependent stimuli: I. Amplitude sensitivity measurements. J Opt Soc Am 51:422–429

    Article  Google Scholar 

  17. Bullough JD, Sweater Hickcox K, Klein TR, Narendran N (2011) Effects of flicker characteristics from solid-state lighting on detection, acceptability and comfort. Lighting Res Technol 43:337–348

    Article  Google Scholar 

  18. Bullough JD, Sweater Hickcox K, Klein TR, Lok A, Narendran N (2012) Detection and acceptability of stroboscopic effects from flicker. Lighting Res Technol 44:477–483

    Article  Google Scholar 

  19. Schmidt-Clausen HJ (1971) The influence of the angular size, adaptation luminance, pulse shape and light colour on the Blondel-Rey constant a. In: Holmes JG (ed) The perception and application of flashing lights. University of Toronto, Toronto, pp 95–111

    Google Scholar 

  20. Battersby WS, Schuckman H (1970) The time course of temporal summation. Vis Res 10:263–273

    Article  Google Scholar 

Download references

Acknowledgments

This study was sponsored by the Fire Protection Research Foundation of the National Fire Protection Association with funding from Honeywell/System Sensor, the National Electrical Manufacturers Association, Siemens, SimplexGrinnell, Bosch and the Gentex Corporation. Amanda Kimball served as project manager. Helpful technical input was provided by Robert Elliot, Dan Finnegan, Bruce Fraser, Larry Grodsky, Jack McNamara, Nadarajah Narendran, Dave Newhouse, Warren Olsen, Isaac Papier, Mark Pavlica, Rodger Reiswig, Lee Richardson, Robert Schifiliti and Andrew Trotta.

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Authors and Affiliations

  1. Lighting Research Center, Rensselaer Polytechnic Institute, 21 Union Street, Troy, NY, 12180, USA

    John D. Bullough, Nicholas P. Skinner & Yiting Zhu

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  1. John D. Bullough
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  2. Nicholas P. Skinner
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  3. Yiting Zhu
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Correspondence to John D. Bullough.

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Bullough, J.D., Skinner, N.P. & Zhu, Y. Indirect Detection of Visual Signals for Emergency Notification. Fire Technol 52, 1427–1444 (2016). https://doi.org/10.1007/s10694-015-0488-8

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  • DOI: https://doi.org/10.1007/s10694-015-0488-8

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