PHYSICS

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP80-00809A000600200457-4
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 6
• Document Creation Date: December 22, 2016
• Document Release Date: June 29, 2011
• Sequence Number: 457
• Publication Date: December 7, 1948
• Content Type: REPORT

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LANGUAGE
.~Cti:J}~'iDLI7PI3;L r
_`fl AL !N*fLLLIG."XC;.. AGENCY
ii-IFORr0 01
COUNTRY USSR
SUBJECT Pl;ysi.:
'-iOW
PUSLIS,IED. ?toathly periodica'.
VIHERE
PUBLISHED Leningrad, USSR
DATE
i UBLISIiED 3enuari i9 3
DATE OF
f,.; of I1'!c:
DATE DIST. Y
NO. OF PAGES
SUPPLEMENT TO
THIS IS UNEVALUATED INFORMATION FOR THE RESEARCI?'
USE OF TRAINED INTELLIGENCE ANALYSTS
?Jiurne). iichook*T FIZIki. No 1, 1945. (s1 Per Abe 44T91 --
Trannlation epeo'ifioallg requested.)
PHSi`OEMPRIC PECIT01AETBY OF TEMPC&ABILY
IAKMCUS BODIES
S. A. Fridmen, Phys Inet in P. L. Lebedev
N. 0. Chiohici; Automt and Telemeoh lost
Aoad So: USSR
CLASSIFiC;,TION C F r e __
=rnvrres DISTRIfhllilOtl
Nate: Numbers in parentheses refer to the bibiiograpa;y'. P.U. figures are appended-/
In view of the wide range of the intensities measured, photoelectric apparatus
or measuring jitteueity of temporarily Iwoinou.a bodies nun bo built to utilize
both photoelumente and photomaltipliers (2). The use of a photomultipiter per-
tilts measuring more ramota etagea of oxtinotion.
If duration of the extinguishing operation under attdy it liatted tc s period
of 0.5 to 1.0 hour, it to possible to assame that the hri tnees of tge tempor-
arily luminous bodies to meae eta. In the range of 3 x 14- to 3 x 10' stilb (or,
rcapeotive)y, from 102 to 10-5RSb) etiib" to a Roasiao etac esd unit of it,c)it
intensity; "asb" is abeniats still The auRumntle el!.miuation we ob.aineA of
th extinction ourvee in temporarl1i irm:nnuo bai'_o3 was based on the sea
1i ear int.na'ty and s.?re ecales.
phosphoresoeooe, the intensity of Web, duriig the process of extinction, in
measured vrtthin the limits of 5 to 6.
Detetmining the nature of the extinction of temposrily luminnue bodies St
itself an impirtant problem from both the theorstloal and practical standpoints.
At grosent lit is ganaraliy determlaed by T?.sual photometry (1). This methth has
sorioue defects, chief among which are the impoasibtlity of reco:r:ing the Initial
stages, the eubjeotivity of results obtained, and the rather great iifficalttee
in making meesosremente. It is possible to eliminate tints defr:otn to F. groat
extent by applying photoelectric methods of photometry.
Soee of the temporarily luainouo bodies produced nt present have very lasting
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As e photometer, WC: cede use aS a+ provious'.?.p con tructed
le!. ~t.e t r. ~fiveurin ver'T'-%',ak .1_ght, beaei on the cPP1ic' I )t, 6C
B1ea;tron ampli.fic^.tion ( ), in which a u'ubetsHi3o tan` ma.E ut,w a i1 yL 1..
,ilt.ipller (h).
The AotomeLer under ntudy originally had a Limited meaeurin1, rxfgn, toad.
,:;
the measurements themnoLvea zero made with considerable lag bru t boot
the neoeEnity of limitleg the opectrem fluctuations. The specific coniltioas
of our problem demanded introducing, in.o the elriult? of the phot-,omeL'er, changes
t;laich would permit mmakiz+g mhiasuremento over a vide rangs of intensities, pro-
vided that there wer6 no lags superimposed on the photometer.
A circuit was designed for meacuriog a vile range of ictereltiea. By.
changing the eagnttude of input resistance it ues posol'tle tp obtain a direct
current autplifler with amplification factors of 10-, 1007'v 104. and 105.
iron (5) arrived ai. a similar solution in studying the problem of
measuring the brightness of stare vtich differ3d in :magnitude.
The preaance of the q;id current Ice, and of the residual current 1w,o,, re
salttog frrt insufficient coaling, brought abort the oLiminntlon of the"
tamparary zero point '.n piecing from one ampli:fioextion factor to another. As a
roeult of oompensatiog the currents In nod F,po, a zero point vas cbtatnad on
all soalet.
To daoreaao the affect of temperature fl.:aotuat lane reeuitt rag f1'om cO iinf,
the photoentltiplier by liquid, air and hosting :,t. xi' i _ ;Warta ,ssr, all. t-nput
and compensating resistances vere isolated in n se9arete measuring block
connected to the input of the amtpltfler by a shielded conductor having high-
quality insulation.
A diagram of the photometer With the measuring block is shown to Figure L.
Ideasaremoot of the initial stages of extinction is extremely difficult.
Haaaurea.ent is limited by both the inertia of the photometer circuit and the
inertia of the output of the measuring instrument.
When the input oapac:ty oi' the ate Lifter to lose toona100t aFf,thue to
one of input revistancee of 100 and 10 ohms, the in measnring the initial stages of extinction was reduced to lees than 10.4 to
10'3 seconis. Hence, measurement of the initial stegeu of ex'`Inou'.oU 1.E Limited
by the time constant of a galvanometer for chart periods consisting of 3 x 10-2
seeonda, as a reenlt of ih:,ct the inertia. of the galvanometer does not o;,caatc;
until eitttr a.1 t' 0.2 aeoonda.
A record of the aeplified photocurrent vac made by means of a photoracepl:tve
lvaucctatur. The optical system of toe recording galvanometer ,an simile': to
t" optical system of a olectroma Otic oacillegraph (5).
To' attain time scales varying in magnitude, a drum with photounnsitise paler
wee rotate:i alternately by one of three synohr sized Warren motors. Aa t1 rseult,
t.!e following time scales were obtained: 1 men - o.0i6 aecc vie
i met - 8.8 eeconls.
Excitation of luminous bodies van carried out according to the din m to
Tagare 0. The lone-wave ultraviolet. rodiationX = 35501 of the quartz lamp L
pesees throug% the "vudov" filter 3 and the diaphragas 2 and ., after being re-
by the mirror surface 5, atrikea through the aperture 6 in the bat onto
the Lurdnous idly 7 under examination. The light flux radiated b.T the lumi.ooun
bcdy tr, the vinible part of the light- ephatruo passes through the objective 8,
Us filter 92. and the diaphragm 10, and is focuser" in the form of a small spat on
trio i,sotocethode it of t;.e pho!ziaaplifier. On tho ou.n19Q, the tuatnoma body ,Rs
screened b:, a ;.igttt-proof oovaring, 2 on the tor. lbcAtattoa was stopped by
c Sts:' _ner off the quart, lamp.
-2-
t' I'tE?aPTAj,
cc
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CON .IAL
pa:-tieulrr atteacion xio paid to the dotor,alratiot cf `~ho D.rear lemzno'sLty
ebaracteriati.c of the photometer represented by figure 3.
Acalysris of the problem showed that considerable Sack of egaillbriun in the
bridge and sharp changers in the imp intonsity might to the in caaaoe .sf the
u: slinet?xity. then the 7.Imit of the input voltage, of the amplifier in 0.5 V,
nonlinearitios, brougat about by the above-mentioned facture, are reciprocally
cotsponsated. photometry of peru neut7y luminoun hod Ion ~stabl:ehos Lhe 11eearlty
of the laminae y)roperty in event measured into_?va1, i.e., from 0.002 to 4.0 asb.
Figure 4 gives comparative results of visual photoelectric photometry.
It follows from Figure !i that, chile the data from visual photometry give e
oonaiderabie number of points at the beginning and and of th3'reoorded came,
photoelectric photometry ivos a good layout of points on the curve and oven
m;-.ea it possible to meanure the extinction vithin the initial 0.1 to 0.2 tseco le.
Flgore "j givice an example of a photo-recording of the extinction of a
luminous body.
The results obtaine& from the photo-recording of a photometer provide a
basis for aCeerting that the photoelectric photometer under dteouseloo permite
obtaining much more emet and complete data on ::ha path of extinction curves for
temporarily lnainone bod'.es compared vltb the data obtained from visual photo-
metry.
BXBYIOGPAM
(1) Bridmsn, S. A., and Oherepnev, A. A., "Permanently and Temporarily
-laminous bodies," lid AN 1JSSR, 1943.
(2) 3L1iokeon, R. T., J Opt Soo, Aser. 36,5, 264, 1946.
3)) Oheoak, A. 0., D UdSR, 36, 2, 157,
194i?
4) -MUabetekiy, L. A., lxv AN UM, Ser Fit, 8, 6, 357 1944?
(5) gpex, G. S., Astrophysical Journ, 103, 3, 326, L9s6.
(6) 14asatkln, A. 8., "Sleotrical Measurements," Gfosenergoisdat, 1946.
`A'ppended figures follow-7
(ONFIDEN IAL
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