Brightness of a Capacitor Discharge Lamp - Bloch's Law for Brief Flashes

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Abstract:

Brightness of a capacitor discharge lamp tc, 16-25 micro sec has been extrapolated from determinations of the subjective attenuation of comparable durations upon square wave flashes from a glow modulator tube R1131C. For the large field 61 degrees and high adaptation state 273 td, psychophysical integration of time and intensity Blochs Law was found to hold only at durations less than 1.5 x 1000 microsec. Examination of the manufacturers data on lamp candlepower converted to trolands encourages the conclusion that large errors occur when the troland and other photometric quantities remain uncorrected for Blochs Law effects which are found at short durations. A correct troland or adequate troland is described.

Author(s):
Dawson, William W. ; Harrison, Joseph ; Harker, George S.
Author Organization(s):
ARMY MEDICAL RESEARCH LAB FORT KNOX KY
Descriptive Note:
Interim rept.
Pagination:
0017

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
USAMRL-987
Task Number(s):
3A061102B71P08
Project Number(s):
DA-3-A-061102-B-71-P
Monitor Series:
USAMRDC
 Subject Terms
Joint Capability Areas:
JCA_1.2.3_Educating; JCA_1.2.5_Lessons Learned; JCA_1.2.7_Experimentation; JCA_5_Command and Control
Communities of Interest:
Biomedical
Descriptor(s):
*BRIGHTNESS, *VISUAL PERCEPTION, *FLASH LAMPS, MEASUREMENT, INTENSITY, PSYCHOPHYSICS, PSYCHOPHYSIOLOGY, VISION, LIGHT, TIME
Field(s)/Group(s):
Psychology
Keyword(s):
LUMINOUS INTENSITY
Report Date:
1972 Jun 20