exposure time

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exposure time

[ik′spō·zhər ‚tīm]
(civil engineering)
The time period of interest for seismic hazard calculations such as the design lifetime of a building or the time over which the numbers of casualties should be estimated.
The amount of time a material is illuminated or irradiated.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Exposure Time


the time interval t during which light-sensitive photographic material is exposed to the continuous action of light. If the radiation power (intensity of illumination on the emulsion layer) is varied during the time of exposure, a distinction is then made between the full exposure time tf and the effective exposure time te, which is less than tf. The effective exposure time is the interval of time during which the photographic layer would be exposed to the same amount of light as during the full exposure time if the radiation power were to remain constant and equal to its maximum value. If the variation of the exposure on the film layer is associated with the type of shutter used in cameras (for example, a diaphragm shutter whose blades are located in or near the pupil of the lens), the ratio of te to tf is called the shutter efficiency. The shutter efficiency is higher with a longer exposure and a smaller lens aperture ratio. The product of the exposure time and the intensity of illumination L is called the exposure or the amount of illumination H = Lt. The same exposure can produce a slightly different photographic effect depending on the relationship between L and t; a similar photochemical phenomenon is called the phenomenon of noninterchangeability.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

exposure time

The time during which a light-sensitive material is subjected to the action of light.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
Age, service duration, years of smoking and exposure time aggravated the risk of occupational illnesses.
For two of the three exposure times, there were significant differences in mortality between repressive and preventive treatment, i.e., at 1 h (Z = 4.14, p = 0.01) and 4 h (Z =2 .22, p = 0.03) there were differences, but not 24 h (Z = 1.82, p = 0.07).
In this study, oleuropein showed a considerable protoscolicidal activity in a concentration dependent fashion, as 0.1% oleuropein was unsuccessful in terms of killing the protoscoleces in half an hour but when the concentration was increased to 2%, it acted as a powerful protoscolicidal in relatively shorter exposure times like 5 minutes.
Moreover, LED-EPM group with 3 seconds of exposure time and 3200 mW/[cm.sup.2] power intensity value showed 4.22[+ or -]1.90[degrees]C temperature rise, but when the exposure time increased to 6 seconds, the 5.5[degrees]C of critical value was exceeded.
* Protoscolicidal effects of the garlic chloroformic extract in a limited exposure time (<5 min) on protoscolices can be applicable during hydatid cyst surgery.
During the elevated temperature process, the internal temperature of the furnace increased to the given value at a rate of 5[degrees]C/min, and then the given exposure temperature was maintained for the certain exposure time (Table 1).
To investigate the effect of exposure time (0; 168; 456; 720 hours) of specimens in kiln in the shear strength values, an analysis of variance (ANOVA) was applied, using the software Minitab[R] 14, considering a 5% significance level (a), the null hypothesis consisting of means equivalence ([H.sub.0]) and their non-equivalence (at least two) as alternative hypothesis Hi).
In this paper, we propose Duo, a recovery-based ITS that leverages software defined networking (SDN) and network function virtualization (NFV) technologies to minimize the overall exposure time without consuming additional computing resources.
There was no dose effect on the Hue angle, regardless of the exposure time to ethylene.
For the stiff gel, three different UV intensities were used (15, 26, and 67 mW/[cm.sup.2]), while the exposure time was steadily increased to obtain increasing dose v alues.
For the use of multiple exposures, the initial values of the exposure time are difficult to determine when inspecting an unknown scenario because the initial values cannot be obtained adaptively according to the measured scene.