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A Presentation on

Roof Strain Monitoring using

FBG sensorsUnder the guidance of

Prof. S.K. Ghorai

Presented By :-

Shubham Kumar(BE/114/!"#

$e%en&ra Kr. Sahu(BE/11'/!"#

Sham )han&ra Re&&(BE/11*+/!"#

DEPARTMENT OF ELECTRONICS AND COMMUNICATION ENGINEERING,BIT MESRA.

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A periodic perturbatio o! t"e re!racti#e

ide$ a%o& t"e 'ber %e&t" ("ic" i) !or*edb+ e$po)ure o! t"e core to a ite)eoptica% iter!erece patter.

What is fber grating ?

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Sc"e*atic dia&ra* o! )tructure ad )pectra% re)po)e o!'ber Bra&& &rati&

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Broadly classifed into twotypes:

Bra&& Grati&) Tra)*i))io &rati&)

Coup%i& occur)bet(ee *ode)tra#e%%i& i oppo)itedirectio)

Coup%i& occur)bet(ee *ode)tra#e%%i& i t"e )a*edirectio.

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To uder)tad ("+ (a#e) reected o- t(o)ucce))i#e iter!ace) are i p"a)e at t"e

Bra&& (a#e%e&t", repre)et t"e (a#eiteracti& (it" oe )*a%% part o! t"e 'bre%ie t"i).

How does FBG work?

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/ece t"e t(o part) o! t"e reected (a#e are ip"a)e (it" oe aot"er0 a re)u%t ("ic" re%ie) o t"e!act t"at t"e (a#e%e&t" i) e1ua% to 2d.

T"at part o! t"e icidet bea* t"at tra#e%) a%o&t"e pat" ABA , "a) tra#e%%ed a e$tra pat" %e&t" o!342. It) p"a)e "a) c"a&ed b+ 5. For t"at part o! t"ebea* ("ic" tra#e%) a%o& ACA , t"e pat" %e&t" i)

3, ("ic" corre)pod) to a p"a)e c"a&e o! 25. Butit "a) a%)o )u-ered a reectio at a %o(6to6"i&"iter!ace. /eceT"e tota% p"a)e c"a&e i) 75, ad t"e p"a)edi-erece bet(ee t"e t(o part) o! t"e bea* i)

89 : 9ACA ; 9ABA:25

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Types o Grating

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Grati& )tructure i) di)creti

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$e%ecti&ity 's (oralised Wa&elength or a FBG

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)ect o &ariation o *n on relecti&ity :

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Our Mode%

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FBG Setup 0

I)et Picture0 FBG u)ed.

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Broadbad)ource

6coup%er

Optica% )pectru* aa%+

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,pectru o Broadband,ource

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Finding o -ero )rror .at / gload condition0:

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Spectra obtaied !or 2&* (ei&"t 0

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Strai e1uatio 0

I : @bd1 021@*o*et o! iertia o! recta&%eabout it) ba)e

Strai: ( + @L42 E I"ere +:Proportioa%it+ co)tat

E:E%a)ticit+ H7 Mpa !orT"er*oco%e @po%+)t+ree

L:Latera% %e&t":.Jc*b:breadt":27.2c*d:dept":K.c*

(:(ei&"t

/o( to 'd )trai de#e%oped i roo! !ro*t"e %oad) :

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,r3no Weight.g30 ,train.45/6.7100

Wa&elength.n0

K KJJ2.K

2 J KJJ2.K

7 K K KJJ2.22 KJ 222 KJJ2.2

J 2 2 KJJ2.7

KJ 222 KJJ2.22

K K KJJ2.K

J KJJ2.

2 2 KJJ2.7

ei&"t to )trai co#er)io

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Fiber Grating ,ensor#rray with 8hase7,ensiti&e 9etection

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K. Broadbad )ource.

2. Pu%)e Modu%ator.

7.A 'ber Mac"6e"der @M Iter!ero*eter.

. TDM De*u$

. BPF

$euireents :

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K Pu%)ed%i&"t!ro*abroadbad)ourcei)%auc"editoa'bercotaii&N&rati&)e)or),(it"di-eretpeareectio(a#e%e&t"),a%o&it)%e&t".

2T"ereectedpu%)e)areroutedt"rou&"t"eM

iter!ero*etert"atact)a)t"e(a#e%e&t"6)"i!tdetector.

7T"eoutputo!t"eMcabeti*e6&atedtoaddre))a+FBG )e)orit"earra+.

How the syste works ?

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Are)etti&e%ectrica%ra*p)i&a%i)app%iedtot"epie

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Fora)tatic)traiiduced

*odu%atioit"ereected(a#e%e&t",83,!ro*&rati&)e)ore%e*et,t"ec"a&eip"a)e)"i!t8@ti)

8@t:6@25d43283:6@25d43U8V

("ere8Vi)t"ed+a*ic)trai)ubectedto&rati&,adUi)t"eor*a%i

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K. Depedece o! (a#e%e&t" )"i!t o t"e)trai app%ied i FBG ad ca%ibratiobet(ee t"e*.

2. Co*p%ete )tep6b+6)tep MATLAB )i*u%atioo! t"e *ode% di)cu))ed to *oitor )trai iroo!) o! #ariou) )tructure.

What we ha&e done tillnow ?

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Setup !or *odu%ati& )ource pu%)e

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W Fa)t Fourier tra)!or* i) app%ied to t"e output ite)it+ o! t"eiter!ero*eter to &et t"e e%ectrica% )pectru* ("ic" "a) c"aracteri)tic))i*i%ar to t"at o! t"e iput (a#e%e&t" )pectru*

T"e Output o! t"e Iter!ero*eter i) pa))ed t"rou&" DEMUX to)eparate out di-eret c"ae%) ("ic" i) t"e pa))ed t"rou&" BPF to&et output )i&a% depedi& o t"e )trai app%ied.

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P"a)e depedece o )trai i) &i#e a)0

?Y:@25d43?V("ere : @K43 @Z34ZV:.pp*4[\d: K**,:K.

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T"e t"orou&" i#e)ti&atio o! "o( )trai ca be *ea)ured u)i& 'ber

bra&& &rati& )e)or) i) doe. T"e Grati& Se)or Arra+ (it" P"a)e6Se)iti#e Detectio *ode% (a) )i*u%ated u)i& MATLAB ad code)e&*et) !or di-eret )e&*et) (ere e$ecuted. Proper ca%ibratio i) doe!or *appi& )trai a&ai)t corre)podi& (a#e%e&t" )"i!t) i FBG ]iai*p%e*etatio o t"e de)i&ed e$peri*eta% )etup. Di-eretIterro&atio tec"i1ue) a#ai%ab%e (ere aa%+)i

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FURTURE Scope

Furt"er (or i) po))ib%e b+ doi& a co*p%ete "ard(are i*p%e*etatioo! t"e )a*e *ode% ad *ai& a (ori& )+)te* e$act%+ ba)ed o t"ecodi& doe. Proper data ac1ui)itio )+)te* "a) to be de#e%oped to

)upport rea%6ti*e *oitori& o! )tructure)^ roo!.

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REFERENCES

K. . _. Rao, `I6'ber Bra&& &rati& )e)or), Mea). Sci. Tec"o%., #o% .

2. U. eet" ad G. Me%t

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T"ai& +ou.

Pre)eted b+0G. S"+a* C"adra Redd+De#edra u*ar Sa"uS"ub"a* u*ar

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