LIQUID GATE CHOICE OF INDEX OF REFRACTION OF LIQUID TO SUPPRESS DIFFRACTION SPECTRUM

Document Type: 
Document Number (FOIA) /ESDN (CREST): 
CIA-RDP78B04747A002700020041-6
Release Decision: 
RIPPUB
Original Classification: 
K
Document Page Count: 
9
Document Creation Date: 
December 28, 2016
Document Release Date: 
June 26, 2002
Sequence Number: 
41
Case Number: 
Publication Date: 
September 13, 1963
Content Type: 
MEMO
File: 
AttachmentSize
PDF icon CIA-RDP78B04747A002700020041-6.pdf397.38 KB
Body: 
Approved For Release 2002/07/12 : CIA-RDP78BO4747AO02700020041-6 Declass Review by NIMA / DoD Tests were de on a si if saggle of each of 5 films. A R chi gratin was printed an each sale d then blessched off so as to leave a. transparent thickneaas grti in the ca ~sion., when piaacexd in the negative plait of fl coherent light ular er (A.= 6328A) the grating caused a diffraction spectrum, the intensity of which was determined by a snit able photocell. Ligoldrr of various indices of ictfraction were applied to the film (both sIdea) to suppress the spectrum; the results were as follows: ME 0 4400 1 N X FOR G 1~?W; ST I 8U 4ESTED USEFUL RANGE 1.66 1:, 62 to 1. 70 1 A. ly32 to 1.42 1.54 to 1.62 1 a 641 (Approx) N I A 12,~:~Kao 4401 4 4 04 X-L 5401 n X. 8401 1.56 to 1.62 STAT STAT is ;/13163 Approved For Release 2002/07/12 : CIA-RDP78BO4747AO02700020041-6 STAT Approved For Release 2002/07/12 : CIA-RDP78B0 477A002700( COHERENT LIGHT ENLARGER Mfl) SPATIAL FILTER 3rd Progress Report: 13 Aug to 9 Sept 63 The breadboard enlarger has been lined up with lens enlargeanentc have been made in coherent light0 These ants show the general characteristics to be expected0 The various artifact s are being traced by further eexperimentation which is currently in pro ressss0 A break down of the E=cas e:rr m,ntd shutter has caused some delay. The optical design for the prototype has been completed, for lens #1,~, h t the design for lens #2 is not yet complete0 Pens #1 design calls for s~.x spherical elements and should therefore be much easier to fabricate than an asptzeric lens design which had been anticipated in the proposal 0 Lens #1, the two collimating lenses, the two cell windows, and a plate for the spatial filter plane were released for optical fabrication0 The optical design for lens #2 of the prototype is not yet complete because the optical designer has been unable to work on it0 If lens #2 is a simple lens (and this is expected) another t*. weeks delay should not affect the schedule. However, the, absence of a design is delayin,,3 the opts-isecbsuical layout, cell fabrication, and those mechanical design aspects contingent on its engineering analysis and customer review, which is scheduled or t e e of 23- Sept; er s te~tt:ative~)r schedule d for 25-26 September. STAT STAT STAT Approved For Release 2002/07/12 : CIA-RDP78$04747A002700020041-6 Approved For Release 2002/07/12: CIA-RDP78B0474 COHERENT LIGHT ENLARGER AND SPATIAL FILTER 2nd Progress Report : 9 Jul to 12 Aug 63 The breadboard enlarger has been act up except for Lens #l. Without lens #1, the spectrum is formed by Lens #2, and this spectrum was used to find the correct liquid index for each of the five films so far provided by the, customer, using bleached Ronchi gratings. A 16-inch focal length collimator objective is now being used as a temporary substitute for Lens #1. This will be used to find approximate exposure and focus, and to make trial enlarge ,eats of test images, which have also been printed on the supplied film. Lens #1 for the breadboard is now in the final stages of figuring and its lateness, if held to one more week, will not affect schedule. The optical design for Lana #1 and Lens #2 of the Prototype is now due one week late, but the Optical Designer is working through vacation. By some schedule manipulation, we can probably absorb one further week of delay without prejudice to final delivery. A trial spatial filter was made, but has not yet been fully evaluated. As it appears to be irregular, improved coating jigs are being fabricated. .Use of the required film has not been provided, and this has necessitated "borrowing" from other Special Projects film. 12-August 1 STAT STAT Approved For Release 2002/07/12 : CIA-RDP78B04747A002700020041-6 Approved For Release 2002/07/12 : CIA-RDP78BO4747AO02700020041-6 pbgo ?f p,~ #r~s t v nd th 'ern In a recent technical memo* it was stated that as a result of he Lorenz- Lorenz law rc2-1 n2+2 0.368 2'.,07 z 10-4 the coefficient of index of refraction , n, variation with t rxnta re, was A--ft in 4 +D 2_ 2 6n where $ is the voles thermal expansion coefficient Of the liquid. (constant) z density, -0.76 x 10 The purpose of this memo is to call attention to the fact that the Loreaa- ,o az law is not accurately valid and that, there forejEquation ( is subject to error. To illustrate this consider experimental date for water and 99+% pure Ethyl alcohol,, at 20?C n4+xe2-2 predicted observed 9 4 Alcohol 10360 (1) (2) ---1.0 x 10-4 0,405 1012 x 10-3 -4.5 x 10-4 -4 ~OF6 x 10-4 STAT --106 __.,., STAT (note typographical error in q. 1) Approved For Release 2002/07/12 : CIA-RDP78BO4747AO02700020041-6 Approved For Lease 2002/07/12 : CIA-RDP78B04747p2700020041-6 arch Page 2 of 2 V -v va # 4Cie Si Af i.F RAY i..ue EII&La yN.iok of y:liftxy & Physics (32nd t da As c 441 ?,e satin t hp erro m as Lot great but v can he znpml fi-nrir a r_ ~~,.g. qF utu r~t~~.a a~aaica . ap .i ~ t s ext nd.iars-nt at M i ` [nrs ec~ s ews j lub Solids the coups is jr, and the law i-i aw- +~gae o "a I i uidS, f lie s .C ac}t' 1-8 thto #=e ' a # a . and F?nM 3x!:iEr hf Sam + . d.C " y 3 Cti:3 b impr v d t ~4~a`~ ci#tkr$~ ?pproac7ced fi x UT uid' 9 L"-)i1{Ca T hit ew g point. Tbit could explain Y ""~ / pr-`Od1cf:? eras 3o b . a# rfo : alcohol t l ~: :~tff although s; ,t eti .. s ~a . a x w tz,4,u .Yr a;n..ore r_o p1o-w thsr, has bs:ora indicates STAT Approved For Release 2002/07/12 : CIA-RDP78BO4747AO02700020041-6 Approved For Release 2002/07/12 : CIA-RDP78BO4747AO02700020041-6 CHANGE OF LIQUID'S REFRACTIVE INDEX WITH TEMPERATURE In many coherent optical systems, it is desirable to have .squid gates in which objects of non-uniform thickness are immersed In a liquid having the same refracf,ive index. Thus, for instance, only transparency differences recorded on film will affect the transmitted light and the thickness irregularities will not alter the optical phase. ecause the refractive index is temperature sensitive, it may be necessary to control the temperature avid/or temperature uniformity of the liquid; and for. this reason, the change of refractive: index with temperature for a liquid was investigated. the Lorenz-Lorentz law states n2_1. c n2+G. :here n is taae refractive inch:, e the density, and c a constant. If 7 is the t perature, and the coefficient of cubical (volume) 4txpension, do dais I!? Thus, do/d9~, a quantity which is seldoam: tabulated, can be evaluated in warms oar n .read both of which are cosy only tabulated. The bracketed ter-at has been evaluated: a~, 1.0 1.1 1,2 1.3 1.4 1.3 1.6 107 5racketeer term 0 0.10 0.21 0.33 0.45 0.59 0.74 0. 91 STAT STAT. Approved For Release 2002/07/12 : CIA-RDP78BO4747AO02700020041-6 n'' + n2 - 2 Approved Folease 2002/07/12 : CIA-RDP78B047#002700020041-6 0, ad, ";c t, , is not I,iket" v 4 &?'td 4 x.,; i'$ ? ?r;A ?B ~ ,~u.tar~ A57' 1,S' t ? tot ;i Y'd .8 ,".riC p le, Liq ;fd wiu-.h. j.Oxj r should b 4 ,v ., the c ;e ii& opIR egi path 1.1 be Cum Q.,z JL+ ? L -