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Download Light Measurement Handbook by Alex Ryer PDF

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By Alex Ryer

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5 second sampling period to provide a significant improvement in signal to noise ratio. Zero The ability to subtract ambient light and noise from readings is a necessary feature for any radiometer. Even in the darkest room, electrical “dark current” in the photodiode must be subtracted. Most radiometers offer a “Zero” button that samples the ambient scatter and electrical noise, subtracting it from subsequent readings. Integrated readings require ambient subtraction as well. In flash measurements especially, the total power of the DC ambient could be higher than the power from an actual flash.

1997). NIST Measurement Services: Photometric Calibrations. [NIST Special Publication 250-37]. Gaithersburg, MD: NIST Optical Technology Division. Rea, M. S. ). (1993). ). New York: Illuminating Engineering Society of North America. Ryer, A. D. (1996). com/handbook/ Ryer, D. V. (1997). Private communication. Smith, W. J. (1966). Modern Optical Engineering. New York: McGraw Hill. Stimson, A. (1974). Photometry and Radiometry for Engineers. New York: John Wiley & Sons. Wyszecki, G. & Stiles, W. S.

5 second sampling period to provide a significant improvement in signal to noise ratio. Zero The ability to subtract ambient light and noise from readings is a necessary feature for any radiometer. Even in the darkest room, electrical “dark current” in the photodiode must be subtracted. Most radiometers offer a “Zero” button that samples the ambient scatter and electrical noise, subtracting it from subsequent readings. Integrated readings require ambient subtraction as well. In flash measurements especially, the total power of the DC ambient could be higher than the power from an actual flash.

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