&lt;title&gt;Nuclear survivable polarization fibers for fiber gyroscopes on spacecraft&lt;/title&gt;

The aim of this work is to illustrate the activities related to the assessment of fibre-optic technology in hostile nuclear environment and to provide the interested reader with an introduction to this subject. Potential applications of fibre-optics in nuclear installations are summarised. Effects of nuclear radiation on optical fibres are shortly discussed. The absence of complete predictive models for the radiation induced attenuation in optical fibres is illustrated by modelling attempts and explained by the wide range of parameters which influence the induced loss. The need for standards in assessing the fibre's radiation resistance is also presented. Finally, experimental methods are illustrated with results of radiation induced attenuation in optical fibres obtained for a high-dose rate and high total dose irradiation, as not often reported in literature.( *) This paper was presented at a poster session.

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“…Related with this, nuclear survivable polarisation fibres have been studied for FOGs on spacecrafl:s [28].…”

Section: Potential Applications Of Optical Fibres In Nuclear Environmmentioning

confidence: 99%

Optical Fibres in Nuclear Radiation Environments

Berghmans¹,

Deparis²,

Coenen³

et al. 1995

Trends in Optical Fibre Metrology and Standards

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“…The most extensively researched area of photonic component radiation effects is that of optical fibers [9][10][11][12][13][14][15][16], a key component in an IFOG. Much of this work was done with 60Co irradiation, with some comparative work using protons [13].…”

Section: 2mentioning

confidence: 99%

<title>Proton-induced degradation in interferometric fiber optic gyroscopes</title>

et al. 1995

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Recent advances in Interferometric Fiber Optic Gyroscope (IFOG) technology have enabled these devices to equal, and in some respects exceed, the performance of the floated, spinning wheel rate integrating gyroscope. However, their ability to perform in a space radiation environment has been a significant concern. Test results are presented addressing the effects of space radiation on the performance of a high precision pointing grade IFOG. Proton induced degradation of the optical components of an IFOG is evaluated based on testing performed at the Harvard Cyclotron Laboratory (HCL). Rationale is provided for using the HCL proton accelerator as a reasonable simulation of the space environment. An analysis is presented which prioritizes the component-level dose tests based on expected radiation sensitivities. The evaluation addresses both total dose (to about 12 had) and dose rate effects. Testing was performed at the component level as well as the system level with an expanded version of a closed-loop operational IFOG. Primary concerns include permanent attenuation and spectral transmission (wavelength) sensitivity to total dose, and angle random walk and bias stability degradation as a function of dose rate. Component level results are presented for a superfluorescent light source, integrated optics chip (bC), coupler and polarization maintaining fiber coils. Closed-loop transient noise results are evaluated based on dose rate testing of the IOC, coupler, and fiber coil. Keywords: Fiber-optic gyroscope, protons, radiation effects, superfiourescent source, photonic components, space systems 120/SPIE Vol. 2482 O-8194-1835-8/95/$6.OO Downloaded From: http://proceedings.spiedigitallibrary.org/ on 07/13/2015 Terms of Use: http://spiedl.org/termsapplications it is necessary to understand the limitations of IFOG performance under typical space radiation environments. In this paper we attempt to gain such an understanding empirically. We report the results of proton-induced degradation studies performed on a variety of key IFOG components. In addition, an expanded version of a closed-loop operational IFOG was characterized while being irradiated by protons.These characterizations were carried-out at the Harvard Cyclotron Laboratory (HCL) in Cambridge, Massachusetts, using a proton accelerator to simulate the space radiation environment.Section 2 provides a brief overview of important aspects of the space radiation environment and its attenuation based on plausible spacecraft shielding. The rationale for choosing proton-irradiation as a means of emulating the space environment is discussed. Section 3 provides an analysis of the sensitivities of overall IFOG performance to expected proton-induced degradation of IFOG components, which is used to select and prioritize the specific test cases. Section 4 discusses the methodology of the component-level proton dose and dose-rate dependent testing based on the priorities established in section 3 and includes a description of the methodology for measuring the proton sensitivity ...

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Current status of radiation effects knowledge for fiber based systems and associated components

Greenwell

Barnes²

RADECS 93. Second European Conference on Radiation and Its Effects on Components and Systems (Cat. No.93TH0616-3)

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<title>Nuclear survivable polarization fibers for fiber gyroscopes on spacecraft</title>

Cited by 4 publications

References 1 publication

Optical Fibres in Nuclear Radiation Environments

Optical Fibres in Nuclear Radiation Environments

<title>Proton-induced degradation in interferometric fiber optic gyroscopes</title>

Current status of radiation effects knowledge for fiber based systems and associated components

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