Abstract
A relatively inexpensive microphotometer is described. The output voltage of the microphotometer is a linear function of luminance, and the sensitivity of the photometer is sufficient for the measurement spot size of .2 mm without special averaging devices. The rise and decay time of the photometer response is less than 100 microsec, and the spectral sensitivity of the photometer can be corrected to approximate that of the human photopic eye.
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Keene, J. P., Black, E. D., & Hayon, E. A photomultiplier and amplifier circuit for kinetic spectrophotometry. The Review of Scientific Instruments, 1969, 40, 1199–1201.
RCA. Photomultiplier tubes, PIT-700B 12/71. RCA, Electronic Components, Harrison, N.J., 1971.
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This research was supported by SITRA, Contract No. 6025 and by the Finnish Academy. We thank Seppo Lindberg and Pauli Visuri for building the microphotometer and Marie-Louise Tiderman for help in preparation of the manuscript,
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Virsu, V., Lehtiö, P.K. A microphotometer for measuring luminance distributions on a CRT. Behavior Research Methods & Instrumentation 7, 29–33 (1975). https://doi.org/10.3758/BF03201286
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DOI: https://doi.org/10.3758/BF03201286