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OF' ENGINEERING WASHIN NQTOI)

n& 23GAND DEVELOWR4T UNIT NSTREPRT NO. 176~

PhWEKT CGID J3i6/t-~3-.4

?PHOTONEWWEC MAKK RI pjFOJR NOTATING OMTCAL Ml8

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ASTIAAMLINO.M NALL STA-fION

ARtlftGT@ 12,, VIUOWI*1

Attas fusjS

YIEL TESTING AND IIIMVOPWEZT MVfl

flOa2O COD~ A6/2.44

M=XG~ThXC ALAINZ MUMIOFMI WMID4 OPTICAL S!8TE1

IMP~ T967IN~G AND EIAflkIT UNITUs So COAST QUAJID YAMV

Curtis ty,0 Baltim~rs 26j, M"72&1nZ

~*, iOCT 1958Da.c so8C~M~wtJ~ ozoU

swmitico,cv F sclsmu .1 lltý Cw udeo =

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USo o.mts Qut Hdqrit ftv lztb A4~o~avzt

or as pmto mpits-iwthout thie welttom pcamI8e3±O fro tl=V-do of zd~v11.u 8,0 coaxt QUS,#z4 ashtng~on 2%, Do, Go

2\J A%~TRAPT~at e~td ona I~.1 3Y)1 ypo2ODA2 photooweW1~t~ cmu.tj

~at!re b tE~ si~s~chDvu4on of the Eor4scwýnato

~b~t ~ ~ sa~ud~vmce to cf$oet tha' a2.q MMn tro~dof WAtion~or t1 ~Ow"a In ;adl~nq0~~ztetn hgl~~o,~t ~s

POSM0Uv**, tO~tsero perf wad for Wwwo'4 @0~pof pbotmkavthdgamst~v~t~y 1I~xdI~&~z~ ~tests 1We" Qcmtt~ed to ~soamz the

"buab1IiW Of the lieot"dtc %A~ olmiated a~

~th& "*w6%1tO Of 00S JQOYhrMp ti~qat it, um ma or~ ~ds

'4 "m um 9t the cmCtol MilP wt t"Wo utmde tits projeat~

P4 Au~ito w opwd bj r~.q'z-4 at, the aR;Mt.we Or w~ aupm dflcea to

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FIND2 TMIZED* A14D DEVAWIM UJNIT

0LFTGTIAZO ALAM4 DEVICEFORi MYATING OPTICAL SYSPT.WG

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devicm for Wicting Lr~gapft-itiea in tho opex~tiou of a rotating optIldlsystemi at a light atiw91ione

2o ~To avlae okr~cia1 d of~ a± phto*-eleatzte c~ontrol as a psible iallam device for a rotatin~g b~eaon TheeIM~iUROonsciste~d of$

2A 11wh initial p~rforiAuno m. " haterlatics of~ the device.

2o Itro pe foa~ie ever a pzrolonzia period of' opoeation'.

to Owmad~ng COfier Field Tosting & Vzo wslot IUizi- dthA 2 Dacemlba 1954,Ig

=4~ 103 Jur 195 ftnle L956

/4 (?ag5 e the Ai rat rapa of~ tet ofaph'v!,ag.aafm oie-o

ro!%in bawo Tst f laimwrede~ie .ZFil T~taIT

& Davolpmout nit :Mpx~zo d-u-'a $15.rb,-%ry1,155 bv 95. n W

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Figure 1Photoswitch Type 20DA2p Ibde1

1001 Photoelectric Control Device

It consists essentially of a light sensitive, gas-filled phojto (Type1P40, S-I response, novp-hygrosoopia base) and an eleabctrIAy assembl-ed as a package unit whose overall dimensions are 7.7/16" 1 4-15/16" X9-5/8" high. It operates from a 115 or 230 volt, 50/60 cps, power source°The wanufacturer's ratings for the unit are as follows.

Pbwer conmWtion - 15 mattsIllumintion level for relay operation (adjustable) - 10 to 50

foot-candees.Ambient temperature range for proper.operation - 320 F to 1250 F."weight - 15 pounds. A e

The unit contains heavy-duty, silver, DPDT contacts rated at 10 amperes at

115 volts, or 5 amperes at 230 volts.

6. Desr•intion ofI, tests COncted.

6.1 - ie-_al 1%?. set-up fr- the first phase of the testsis shown by the schmtic of F'.rae 2 (Page 3). Light from the steady-burning lamp, A, periodick'.Lji ý ;- 'rrupted by the rotating disc, B, withaperture, D, was incident uj• the window, E, of the alarm device F. Avariable speed Aetor, C. 4"ivivzg the dia, provided a means of varying theflash perioJ. The load rteC of the relay within the device was connected toa yellow incandescent lamp, such that, for a given sensitivity setting onthe alarm unit, a stz"ficit dorease in the i1lumirance of the phototubeand/or decrease in speed of rtoetion of the disc caused this lamp to belighted.

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4 UL IETM a&PET~ti .SEC O 71:ArGUR AR OT 0 leII

64,2 DA fora tcaibrmtionmaorvon uwaobtaina tiy dotirinrisg,- f~or aut of sverlO speed of rotat~ion of the&iao, t~he amra wtlua of ill~u~aUme; at the wirdcwp for iuhi~ch the airmIn~a was erawgisd. Min pme~ia~e mm mepm~tld for eacoh of semral poss..tiono of the som~itlvWty adjustaemt on the davloe., Thisa utitivityo~txv1,* which Qppm~rs .rxtexim.1y as the oiottod hand of an o4jueting*crew# w~s m~4ified by FMII to p~awit the additkaz of a peripheral acal~ein order that it aoulcd be po.oitiveiy retum~nd to azV selected vattimeThe .zabiont level, of umuimtlon of' tAe xoom wau date-m-inedp and holdonsmtant uhile obtain~mg the erperimantaldat,,

6 ,3 * p, Upon compistiox ofi Vas calibzuti~onv the cgmimeat~ %%S alowad to nrn ithoutt inUtx-Amton unil failure, F'or this tec't,the~ conWitioms of iUlt trazwo aW di &tpod pvi ee %L to -'khe values Upmrdicated br Point (A%) on Figuare 3. Thif point was selected as& a aonvemt~one In the Wknee" of Cueve il5* Wit: the illummm at 8 foot; .m=Ud*ea dthe peried of di.zo rotation at W. mxms W±Vh Wei settlrigv a deareaseIni ill iance to about 5 faotwcartlem or an ines-ase Ini tho ~~ of~rotation to about Zo9 seaozdiy, uwld 't4z t imrm

7.1 The oaUbr'ation ourves -for' the Q2anx, de±leeare almm in F.4gaue 3 (P'age' 50)s The parazmers on the ora-e ae ther.bitrary re rcm mmbsrs or. t'ih acale wJtich F M. added to the neio*

Durzing the cows of tho teat,- fmquaeat chokc rzem =d to imr hatoalarm devieaO OUt1P A* Aio'tcAd pm~yo.y Thaý- aeuk usily

ed of xviv--Ug the ]Igit flim inz±ema on~ 'Uh ontc1~ ~~Occaiona1 almwdorn of the m.i-II (e1s3 pmdmd an a ~test~t oftC

the woeshon ofw 20 a,2.3 July 1956ý at, which tirm it failcd aopletolywemiri the i imfrtlon to sero Catled t~o operata thbe 1avar Th oevo

be thie t-erul~t of -a bemadat potentiomters xajrklOsura I. S& op fao0ginsringre po-o deeii4ng the~ faJluro A xnw pmtm~iat o uae Jm½

lmm* 1tup and -xotingU dic w~re s7Wacaed by a~ 3:1, Tat 15 m-tt lwpv£aetmXtMd by la U tir equipkpmd a~ tCam cut for a 1A&atto &m'~kntio of 145; t'he timer wa set f'or a Moah posriod of 4 stonda* Tho~llvirtzo at the i-An3ow of tho alari dezv ice v a at f IvTho tezt ýieZ--p is in r, , /.?ar

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14.

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-.. - -.--.. 4 -.- -o

4- * * -

S....-- - - -~ - - -

- -t -" •- --

- 4- .- - - 4 -- -' - - - -- - -

Figure 4Teat Set-up for Second Endurance

Test of the Photoelectric Alarm Device

The scale originally added to the sensitivity adjustment was removed whenthe alarm device was returned to the factory for repair. The arbitrarysensitivity settings utod in the calibration shown by Figure 3 could nolonger be repeated. At the start of the second endurance test, thesensitivity adjustment was set to an arbitrary position near the aid pointof tho range of adjustment. The second endurance test was begun on 30September 1957. Periodic checks were m=de, in the mnner of the first en-duzance test, to insure that the device was functioning correctly. On 2January 1958, the photoelectric alart unit was still operating properlywith the original sensitivity. setting, flasher characteristic, andillu inance. Subsequent to that date, it became necessary to increase,periodicallyp the senzitivity of the control device, by means of the slot-ted screw adjustment, to maintain satisfactory operation. After reachingthe point of m-iimua sensitivity it was further necessary to increase,periodically, the illuwimance of the window of the alarm unit* By aid-September 1958, with the device met for xinm sensitivity, and with awimdow illusinance of 25 foot-aandles, the condition of the device was suchthat the alarm lamps were energised near the end of the dark, period of eachcycle. The apparatus was allowed to run in this condition umtil 1 October19;3A On this date the apparatus was turned off. It we zwted however,that at this time the period of the one second duration flashing source lamppWd in opasra to 6 Teo s. On 6 Oetoior 1958o th te apparatus was egatinplaced in operation. The flash period and window i1l1minarec. were roaset to

wbc# oraigfrl valuea of Cour voorn& end .5 fotowmxdla respectilvelyoJhnd6r thoe~ co-iin. the 1alana ovicrA o m3-:ta rati8Ifitozri.y with thesonsitivity set romawhat boiow the zad ~a'vuaibN*.

8.1 The calbration curves of Fig~ae ,) Irica~tep In goera1g, thQrange of' 1iumizna-oe ~wW f-Tah pwAoda over which~ the trasted alarm deviceopemtces satlsfactox'±ly Azn a nw candition It shouldI be notodt Iowevewthat these curm; apply to a spec~fo light to d'sari =tiov which tim noi-=vdpd when the data vcra taken.

Sa2 Thaw remlts of the aecoand wdunoen toot ar sach thait It mn, '

n~ot bo aceinactoly date=n.4=4 xt~mv =eh1 of t~he app&a2went fatigwo of tkiophtooW-i in tbz device tms actual futigue azd how =mch was due to thsi

nlovdown of the M~a~thijr The Che that the dovice operated proporly, vhonpat thip erd ot tile testp the Mwmo,-# and flash period wero restored too:-Agii1 rtalua leads to the conclmioin that iamoh of the appam~t fatiEuowas rau~d 1W flasher oWdrnm., XIn cou~derig this co~usobnuo bowavers itoso'ald be zroted thats

(a) "K" the Weecornd. imac etteevswm rvddothe sear4tIvIty adjutrzn and tho diffezraie b3tween the Imitial. a~ ±ixt~1Isenuitivr.ty nattings &iru not kriov%~ arid

(b) The pbotocell %a not in opramticn for five dwys pr~ior to -t~herenoxat~iop of the 3.n1ttL illmimwe, condition and flaher chretcriatepand may 16avo rocovexed to~ ~oota oxtibt from wliatevair fatlgw It ma~y hav

V

9.1 Tho tw5o of the~ pot10ov tric warl ___t toite: mretl zjo

9#2 A f1.ter would bo nqvl~rod a~t tho, v±j-Av of' tho alarm doirL-2a to nwdtwco tbo M=UuL--o oCr U3~ VAb'- to a pm'aetilc lovcal-

9o.3 Por"IM4c cdju zstý:t or tie veitivity of tbia doi7).*a could ba. rxf4tt)o a# for p, ,'oaocal1 fztl i,!io* iatigtz could to **rc*4to1 t

M"M" COSWORATION Of AWNL-.

Septsie-ber 1956

Sitbj~ect: 20~DA20 C'or~trol for U. S. Coast Guard

Tliei. are Vi~e results:

1. The capacitor aciloss Vie relayL oc(%1 k'wAS fmir~d to be physacal3ydamtaged (tho paper s4,11 %-a& purictared by Ii*nFmSUrrnez' lamIi lzatmflscrew and, thierefore, the capa~citor was Ofectt'icalIy si1Qit~d.'Ills cutd 4appen only by remuving wue iu-it frur- ti >xuiacornprassii1; tie chassis so that thie tron~ftirtner scrf-iw penet~ratedthe capacItor shell. it seer~w t~it ttide vas iaot th- cauu,-i of failu."oat thc, )ife to~ but wvas dunxe during, the vigu~i inspuctioa at theCoast Guard after the~ life teatv The engincr~eiml Ciran eb arem~ade c-i~airin-r the transforme~r serew, ao-jumbly in ti)r-iC'r t%_'prevent thfi Sort of dlamag~e ýA the corrpiuaent4s in tftte fuit're.

2, i7ri'% time delay ptatcntin-neter was ArA ~ e opfsn.

TIhe OpeningI Of,~the 4n~e delay putcationieter w~as detcteta on sonmeother anit*s some tllm,ý a~o 7I'e test fihws thait tltib wae; due toover loswitr, th~ p' ..-tcmeter at tho. low end A. timre delay raunge.A NtiW ttihe delayy i cuit was z'~desimned and im already Ini effeCtfror new produetid. units. Alt,- 44n thie new eix'cuit the time~ (elavIs istL5iWzed for t(?mperatthA':,- _--ianqem,.

"I'lie, uaiit liaa been r~worke'd and sidpped 'Ia-,k to. Mr. Ed*v IA j. Fr' Jr.

ii7. DiVIimI..