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ASTM E1614-94(2021)
Standard Guide for Procedure for Measuring Ionizing Radiation-Induced Attenuation in Silica-Based Optical Fibers and Cables for Use in Remote Fiber-Optic Spectroscopy and Broadband Systems
NORMA vydaná dňa 1.9.2021
Informácie o norme:
Označenie normy: ASTM E1614-94(2021)
Dátum vydania normy: 1.9.2021
Kód tovaru: NS-1034907
Počet strán: 6
Približná hmotnosť: 18 g (0.04 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
Kategórie - podobné normy:
Anotácia textu normy ASTM E1614-94(2021) :
Keywords:
broadband, optical fibers, radiation-induced attenuation, spectroscopy,, ICS Number Code 33.180.10 (Fibres and cables)
Doplňujúce informácie
| Significance and Use | ||||
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4.1?Ionizing environments will affect the performance of optical fibers/cables being used to transmit spectroscopic information from a remote location. Determination of the type and magnitude of the spectral attenuation or interferences, or both, produced by the ionizing radiation in the fiber is necessary for evaluating the performance of an optical fiber sensor system. 4.2?The results of the test can be utilized as a selection criteria for optical fibers used in optical fiber spectroscopic sensor systems. Note 1:?The attenuation of optical fibers generally increases
when exposed to ionizing radiation. This is due primarily to the
trapping of radiolytic electrons and holes at defect sites in the
optical materials, that is, the formation of color centers. The
depopulation of these color centers by thermal and/or optical
(photobleaching) processes, or both, causes recovery, usually
resulting in a decrease in radiation-induced attenuation. Recovery
of the attenuation after irradiation depends on many variables,
including the temperature of the test sample, the composition of
the sample, the spectrum and type of radiation employed, the total
dose applied to the test sample, the light level used to measure
the attenuation, and the operating spectrum. Under some continuous
conditions, recovery is never complete.
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| 1. Scope | ||||
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1.1?This guide covers a method for measuring the real time, in situ radiation-induced spectral attenuation of multimode, step index, silica optical fibers transmitting unpolarized light. This procedure specifically addresses steady-state ionizing radiation (that is, alpha, beta, gamma, protons, etc.) with appropriate changes in dosimetry, and shielding considerations, depending upon the irradiation source. 1.2?This test procedure is not intended to test the balance of the optical and non-optical components of an optical fiber-based system, but may be modified to test other components in a continuous irradiation environment. 1.3?The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4?This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5?This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. |
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| 2. Referenced Documents | ||||
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