DAVID H. SHOEMAKER - LIGO - Caltech

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Article: Lou-noise rl capacitance bridgc transd,ucer Low-noise rt capacitance bridge transducer Paul S. Udsay and Oayid H. Shosmake. D.F^rat oi FhsEa -U*isB l&tua of fdh,obql. Clab.itlt .V!g.rist' 02|39 lRavca It O
tt2 \'|th felpcct io lhe 6!sr and ils output is usad to offsct changcs ill rhc r6islivc ba/aoca of rhc bridgc. In bolh ca$s thc mirc! output is f.d back to rhc bridgc rhrough a iow-pai! 6ltcr a5 dercribcd abovc. fo! collect opcrarion of thr scrvo imp. Tlc lclual physical circui! i5 moufltcd oo lbrc. prinled circuir board! dcsigncd to fia in NIM modsles, Onc bo..d containr the bridga circuia, rhrrr 5tagei of ri ampii6cabod ard filtcring. ooe sragc ofaudio facdback and low noigc powsr suprpiic6. TIl' circuia dilgrad foa rhis board ll gjvcr in Fig. l. Ttc rf bridgc drivc i5 appti.d to th€ bflogE lhrouth a 5:l rrcpup lrelsfonnaf and Drovidci abour 80 V !'€ar-rc.F€ak ro th. bndgc ctcme'lls. Ttc Dndgc lll put i!!o coarsc balaoce by ulirg tba rDcchanrcatly runcd caoacitors and rEsrsrort Fioa balalcc and clecrlonic faadbsct rra Fro.2- Fqc!i.!d maintaitt.d dn! by thc volt!8c ! o{ r!. brnrs. cgntroll.d capacito. (INJ470A) and rhc vol14s,[ri"6L tcsGlo. (VCR7N)- T}c bridSr irnbat.occ iighal is cou. plcd our rhrougi a l: I trasrtbflD.r cuir.and lha mir..r!, ald rhc! Diapiacemcn! amplifcd of rhc pcnduluo fron by an FET ditrcrcnrial cqulltonuln prcldtrCes arnpli6c!. Thc U4l I rnalched a changc io rhe valuC oair of lhe scnsc wa! choscn fo! il! Largc rtansconor.,ctarce capacirca. This in tum and conscqucor cEsla! sn ec signal lhc cafiicr low rohc rr rl frcqucncics. lrEqucrcy Tb. mcasu!.d .t rhc .quivaicnt bridgc ou.pu. which in. is &npliicd br. rhc pul noise of lhi! r|nptiicr r*o is low 1.5 x norisalO{ V/Hzr/t. rf diferlnatd pr€3rnpli6cli. Thc Thc signal ir ihcn Barn of thit drnplife! is largc crough a-trrpli6d thaough !o lhar !\ro la5 mor! inpur sBgca of bandpAls 6kc! nolsc ls Inc domrnent aod rf garn. soulc! of clcctrqnic Thc noisc bandpsss iI| rhc dltcrs arr rccded ro clirninalc anlire circuit. Bolh FET harmonicr Emplificl3 are of thc sdiusrad oscjllalor for fEquclca mar- trl|a|"|tcd by non. rmuft g n rnd cotlrnor luncrr .i.mcnl5 mod. rcieclio!. in rhc Tha bride!. bandpEs, lf thcsc hemonrcr wat 6ltc! clc6cn6 arc not scl.ctad !o Enov€d thcy wou/d seluratc tha tivc a Chcbysh.v ,€jFlrnjc lalar Strgaa Of ar!. ccnrcrcd piifcrlton. od-rhc b,ridgc drjva frequcncy Ttc bridgc and a bend-pala irgr.l i.r rhctt ,plir ln lvo and of roughly 0.5 shtlt MHz d to audio frEqucnqc! i! a dooblc bdsrccd m|x.a, Figurc 4 rhows 4 circuir diagraflt Eoch mircl input is prccldcd of lhc sccond bolrdby a band@s ollel and Thi! board contads budcl rhc primary rnpli6e! io prcvenr orci.llaror. bridaa harmonict of ih. Iocal qrcrlrnd rnixcr I.tor (L.O.) driv6. phasc rhfrcr:. rnrrcrs, rwo from_t.*ing sr!g6 back of;f g?tn ioto rhc circui( Ttc pharc ald filterirg, rudio gatn ol and onc |'|rrcr fltcai, and low LO, i! noEc scr ro bc i[ phala !o\r.! wilb r brjdgE suppli6. Ttc rf 6l(c! si8rlal componcnt! *crc caused by r cbangc chorca ro ia bndp copecity. hauc Thc ourpit thc same characlaairri.s ot r.' tta ln6 mrxc! rf E rhcn 6[c! ulad on lhc to bridga null lny capdcrlivc idbahncc board. Thc rudio ol.!h. lrcquancy burfcr bridgE. Cl3 t.t0 is Thi! oulpu! nn i! at$ op"arn'p u!.d ro dlivc lbc high, wirh voiisgc FETinpuaaand los inFru! bia! curtqL aEplifirr *hich ThiB in aum dr.opr lhc pclduluft D.cvcnls 06_ cillarionr Ttc &cond nircr i, drivca 90" oor of ghasc :n".ce?l"lll tarSe offs!! eolrager from bcing BcnEir.cd Dy (!c hr8tr trhpdanc!. Ios.pass 6ke. trhlch Dalcedcs it. il F.r, sct rnrruti., val. 3lt, o. t, Jd, ta!: C.a|-crrE. b.i.rl. t r..tu€t Fra J. l.td&
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ORSAY n'd'ordre: UNIVERSITE DE PARI
Page 3 and 4:
Il est un vrai plaisir d'avoir I'op
Page 5 and 6:
Table des Mati€res 0) Introductio
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Partie 1: Spdciffcation du problenr
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I )- LZ Un pctit pcn de Relatiuiti
Page 13 and 14:
t4 La oroduction d,es ondes dc grcv
Page 15 and 16:
16 La prod,uction dcs ondes de grav
Page 17 and 18:
lt- t8 La prod,uction d,ea ondcs d.
Page 19 and 20:
I ; I ,t- 20 Ld prod,uction des ond
Page 21 and 22:
L'histoire des eforts de ditection
Page 23 and 24:
24 Principe de la ditection intcrld
Page 25 and 26:
26 Principc de la di,tection interl
Page 27 and 28:
Principe de la d,itection interf ir
Page 29 and 30:
30 Principc de la ddtcction intert'
Page 31 and 32:
32 Principe dc la ditection interf
Page 34 and 35:
{ lC) Sources de bruit Sourccs de b
Page 36 and 37:
Sourcce de bruil Les fluctuations d
Page 38 and 39:
Sources d,e bruit 39 Fluctuatione d
Page 40 and 41:
Sources de bruit 4L faisceaux, mais
Page 42 and 43:
" Sources dc bruit 43 oir A.8 est I
Page 44 and 45:
Sources d,c bruit 45 spectrale lini
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I I N - (J (') TI L L L tr lo- J -i
Page 48:
Partie 2: Solutions particulibres r
Page 51 and 52:
62 La boucle d'asservisscment I Y F
Page 53 and 54:
64 La photodiode boucle; la forme e
Page 55 and 56:
56 La photod,iode ! E 3 q L 5 tr o
Page 57 and 58:
58 Lo photodiode Nous avons mesur6
Page 59 and 60: 60 L'amplificateur de photodiode L'
Page 61 and 62: L'amplificateur de photodiodc un au
Page 63 and 64: 64 L'amplificateur de photodiod,e +
Page 65 and 66: 66 Les cellules de pockels Un inter
Page 68 and 69: 2El) SystEmes dtisolation sismique
Page 70 and 71: Systimcs d,,isolation.lsmiguc Pour
Page 72 and 73: Systdmes d,'isolation sismiquc Ig s
Page 74 and 75: Systi,mesd,'iaolationsiemiqve 16 qu
Page 76 and 77: L 4J (!l L A -t l0 z 10 lo to -4 lo
Page 78 and 79: ou, substituant notre M particulier
Page 80 and 81: SgstEmcs d'isolation sismiquc 8l Si
Page 82: F l CJ (I 5 lo- -t to to3 l -'I I l
Page 85 and 86: La nicessiti, Ic concept oit zu est
Page 87 and 88: 88 Sgstdmes rialistes problime est
Page 89 and 90: 90 N[ogcns d,e ditection {car le br
Page 91 and 92: Moyens d,c ditection possbde une pa
Page 93 and 94: 94 lv[oyens de d,itection or) 16 es
Page 95 and 96: 96 ivloyens dc contr6le une diode l
Page 97 and 98: 98 Moyeu d.c contr6le Pour la maque
Page 99 and 100: l Moycns d,e contt6le lames station
Page 101 and 102: I IOZ Moycns dc conlr6le un divelop
Page 103 and 104: o4 Systimes rialistes moteur verre
Page 105 and 106: 06 .9ysfimcs rialistes v- Figure 2C
Page 107 and 108: 108 S enseur oceultation, moteur ma
Page 109: lI0 Conclusions Parce que I'axe de
Page 113 and 114: l14 t!O.l_ rcrl dA{* , t v y, E --t
Page 115 and 116: 116
Page 117 and 118: ll8 D, Shocrq.f.s., R. Schiflng, L.
Page 119 and 120: 720 2) Quaarua aoise The two ara! o
Page 121 and 122: t22 {l € r n-15 2 1o- t6 10-., ra
Page 123 and 124: 724 F .Thc daopiag forccr * a.ll]l:
Page 125 and 126: ?o ! A tota,l path lclgth diEercnce
Page 127 and 128: t28 S IH a t0-16 a I l0-16 tl 103 F
Page 129 and 130: 130 Appendices A) Ca.lculatioE of t
Page 131 and 132: 132 wldcltelcrib. .rtorr i.tr Fl ao
Page 133 and 134: 134 *-_*1 ll 6: fora 3f ihc tiolia
Page 135 and 136: 130 19 . Eowcver, tha itttedeao4ete
Page 137 and 138: 138 f 2l pq Bjl.:C, K. -Vaircbbcrgc
Page 139 and 140: 140 Caracli,ristiques du systi.ne a
Page 141 and 142: L42 Lcs caractiristiqucs statrques
Page 143 and 144: 144 Pompagc L'efficacit6 de pompage
Page 145 and 146: 146 Pompage Ce chauffage a deux con
Page 147 and 148: f48 Pompagc r 0 0 9 o 6 o 4 0 2 oo
Page 149 and 150: 150 Pompage pompe 606 cristal Nd:YA
Page 151 and 152: 152 pompagc ?r? = l.g5 pmi seion la
Page 153 and 154: 154 Creuz spatiauz de gatn c l o 0
Page 155 and 156: 156 Creuz spntiauz d,e gatn de vie
Page 157 and 158: 58 Creux spatiauz de gain r 5 _. 05
Page 159 and 160: loo L'itat de polarisation sont ind
Page 161 and 162:
162 Risumi R6sumd Nous avons abouti
Page 163 and 164:
164 Les sourcee dc bruit c'est un r
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: : a :- I 6 166 L'asserdssement du
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170 Les fluctuations de lri.quencc
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172 Les fluctuahons de fri.quence O
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o 6 L CJ C L dJ a c ag L F o c! L o
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176 A fllqucocy-rirbili!.d l€lcr-
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L7E a?or"Flr$itilr'ion .*;i'."J:f,i
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180 .l -- o c - L N L F 4 to 2 ro 0
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4) R6fdrences Rilirences Billing'78
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Y taelt oJ: Rildrences 187 F . Reif
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DAVID H. SHOEMAKER - LIGO - Caltech

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