ADAI0i 836 MISSOURI UN? V-ROLLA GRADUATE CENTER FOR CLOUD HSC-E F,/G11/2

CON STRUCTION OF FULL SIZE CLOUD SIMULATION CHAMBER.CUI 7JUN 81 D R WHITE F49620-80-C-0090

UNCLASSIFIED NL

*flflflflflI IENIIIIIII[

LEVEL'PROGRESS REPORT

(TweTY COPIES ReQUIRED)

1. ARO PROPOSAL NUMBER: N/A

2. PERIOD COVERED BY REPORT: January 1, 1981 - June 30. 19RI

3. TITLE OF PROPOSAL: Construction of Full Size Cloud

Simulation Chamber

4. CONTRACT OR GRANT NUMBER: F49620-80-C-0090 w''University of Missouri-Rolla

5. NAME OF INSTITUTION: Graduate Center for Cloud Physics Research

Daniel R. White6. AUTHOR(S) OF REPORT:.________ _______

7. LIST OF MANUSCRIPTS SUBMITTED OR PUBLISHED UNDER ARO SPONSORSHIPDURING THIS PERIOD, INCLUDING JOURNAL REFERENCES:

8. SCIENTIFIC PERSONNEL SUPPORTED BY THIS PROJECT AND DEGREES AWARDEDDURING THIS REPORTING PERIOD:

Ronald D. Fannin Hassanali B. SadeghiJohn L. Schmitt Student Workers - 18Daniel R. WhiteJames L. Kassner, Jr.Max W. AlcornSteve GabelDan Harrington D T ICRay Hopkins -DCT -Carolyn KrebsMax Trueblood JUL 2 2 1981*IM Bill WalkerRichard Ward

8 Dr. James L. Kassner 16663-GS DSUniversity of Missouri at Rolla

Graduate Center for Cloud Physics Research~Rolla, MO 65401

-=a MDISTRIBUTION STATEMFNT A

Approved for public release;__.Di.stribution Unlimited

81. 7 22 0 57'

BRIEF OUTLUNE OF REUEARC1 FJND14GS

Statement of Work

Introduction

Mechanical Work' 4

Optical Work

Electrical Work; 6

Third Year Work

Summary of Expenditures 7

Report of Inventions and Subcontracts

14

w

V°.

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REPORT DOCUMENTATION PAGE READ INSTRUCTIONSBEFORE COMPLETING FORM

I. REPORT NUMBER 12. GOVT ACCESSION NO. 3. RECIPIENT'S CATALOG NUMBER

AFOSR F49620-80-C-0090-0001 4 A-A... 3. 4. TITLE (and Subitle) ti.-T, - I JLOII4HRl IO ~ ltEConstruction of Full Size Cloud( Progress Xep 4"t, : Jan -

\- Simulation Chamber. TQLJun¢ 1981.6. PERFORMI . PUY -NUMB ER

7. AUTHOR(a) S. CONTRACT OR GRANT NUMBER(e)

Daniel R./White AFOSRF-4962- 80-C-0090

9. PERFORMING ORGANIZATION NAME AND ADDRESS 10. PROSRAM ELEMENT. PROJECT. TASK

Graduate Center for Cloud Physics Research AREA WORK UNIT NUMBERS.

University of Missouri-Rolla /_A2310 A,*, Rolla, Missouri 65401 'y - .

It. CONTROLLING OFFICE NAME AND ADDRESS * 12. ote"RT oM1'E..

Air Force Office of Scientific Research //I June * n8lBldg. 410, Bolling AFB ,,.",UMBRO5Washington, D. C. 20332 1414. MONITORING AGENCY NAME 6 AODRESS(il dlfe.nt from Co!OUaCJite) IS. SECURITY CLASS. (of this report)

IS.. DECLASSIFICATION/DOWNGRADINGSCHEDULE

16. DISTRIBUTION STATEMENT (of this Report)

I DISTRIBUTION STATEMENT AApproved for public releasel

Distribution Unlimited

17. DISTRIBUTION STATEMENT (of the abetract entered In Block 20, it different from Report)

IS. SUPPLEMENTARY NOTES

19. KEY WORDS (Continue on reveree aide i necesar) and Identily by block number)

cloud chamber, cloud simulation, expansion chamber

20. AB$" ACT (Continue on rover&.* aide ifneooC and Identify by block number)

-- Work on construction of the full size cooled wall cloud simu-lation chamber has been pursued in three main areas. The mechani-cal construction has begun the assembly of the small Proto 11chamber and started machining of the major components of the largeRomulus chamber. The study of the temperature uniformity over thesurface of the inner wall plates was completed. The design prob-lem with the primary chamber sealing gaskets was solved. The,

DD IOJA 1473 EDITION OF I NOVl65 1S OSOLETE , /SECURITY CLASSIFICATION OF THIS PAGE (%io Dat Fntered)

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optical table and tower for the Romulus chamber were purchasedand set up for testing. Also a preliminary design for an activelycooled window port was developed. Construction of the switchingpower supplies, and development of the control systems for thethermoelectric modules used for wall temperature control wasinitiated. Drift problems with the transistor thermometers weretraced to changes in manufacturers' procedures and corrective measures were taken to solve the problem.

Acoession For

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Statement of Work

The purpose of this work is to construct a 10 foot tall

cooled wall cloud simulation chamber capable of cooling at lS*C/

min. Construction will include secondary cooling, computer con-

trol and data acquisition, and other control systems required

for operation of the chamber.- The chamber will be incorporated

into the existing UMR prototype facility.

Introduction

During the past year work in many areas has proceeded from

the planning and design stages to construction, testing and as-

sembly. While significant work has been accomplished in both

the electronics and optical area the most visible results have

been in the mechanical work.

The post mortem of the Proto I chamber completed at the end

of the first year's work verified that the invasion of the thermo-

electric modules by the potting compound used for sealing had

caused mechanical separation of the modules due to thermal expan-

sion during high power operation. This meant that the problem of

gasket seals had to be solved for both the Proto II and Romulus

chambers. The additional engineering studies required have

caused a shift in the areas of concentrated effort.

Mechanical Work

An extensive study of the temperature uniformity over the

surface of the chamber inner wall plates has been carried out.

Several small but important modifications have resulted. First

it was found that without the massive reverse heat flow due to

the potting compound the uniformity Df temperature was very

2

sensitive to the flatness and uniformity of thickness of the

thermoelectric modules placed under each inner wall plate. This

resulted in a revision of the specifications on the thermoelectric

modules prior to purchase. With the Proto II chamber it was

found that the edges of the inner wall plates had to be beveled

to reduce the mass of plate material per thermoelectric module

to more nearly match that of the modules in the center of the

plate.

Since the sealing gasket around the edge of the inner wall

plate represents a major possible heat leak between the heat sink

and inner wall plate a program to design a suitable gasket was

carried out with the temperature studies. The resulting gasket

utilizes a molding compound which forms a closed cell foam during

the curing process. Both studies have been carried out for the

Proto II chamber, however the results apply directly to the

Romulus chamber.

Many of the small parts such as those for the manifolds con-

necting the secondary cooling system to the heat sinks are being

cast using a filled epoxy compound. The parts for Proto II are

nearly complete and the required molds for Romulus parts are

ready. Fabrication of the remaining parts is proceeding at the

rate of a few per day until the required number is complete.

Machine work on the top and bottom heat sinks and one sec-

tion of side wall heat sinks for Proto II is complete and work

on the second set of side wall heat sinks is underway. The top

and bottom heat sinks have been anodized and the cooling mani-

fold assembled and successfully tested. Work on the heat sinks

3

for the Romulus chamber has been started but is currently behind

schedule, however, the university central shop is making a major

effort to make up for lost time. They have received the numeri-

cal controls for their vertical milling machine and now have all

the items of major equipment required to complete the work.

Based on the results of the temperature uniformity tests the

thermoelectric modules required were purchased. Due to the close

tolerance required for thermoelectrics under a single plate,

±0.0001 in., and the number of thermoelectric modules involved,

7000 modules, a computerized gaging system was developed to meas-

ure the flatness and thickness of each module. The system was

used to determine acceptance of the modules from the manufacturer.

The resulting data base is also being used to select the modules

which are suitable for use under a single i nner wall plate.

Selection and internal wiring of the sets for Proto II is approx-

imately 50% complete.

other areas of work have included completion of the assembly

hoist for Proto 11 and acquisition of parts for the Romulus hoist.

The concrete pad which will provide a base for both the Romulus

chamber and optical table was completed. The system for clean-

ing, drying and saturating the air used in sample preparation

was overhauled and relocated to accommodate the two new chambers.

Keeping in mind the extensive tests required for the inner

wall of Proto I1,a test section duplicating one face of a Romulus

side wall heat sink has been completed along with pieces to serve

as the two adjacent faces. This test section will be used to

verify the temperature uniformity of the inner wall plate, gasket

4

design and manifold designs.

A computer model of the heat transfer in the Romulus cham-

ber has been developed using an electrical analog technique.

This model now includes the external secondary cooling loop and

will be used to develop the required specifications for the

secondary cooling system.

Optical Work

It was our original intention to construct the optical table

and framework for Romulus ourselves, however, the saturation of

our work force and the need to insure internal damping of the

system resulted in a decision to purchase the table and tower as

a unit from Newport Research Corporation. The system has been

received and set up for testing. At present the results indicate

that the stability of the system is extremely good with little

or no long term drift.

In addition to re-evaluation of the Doppler laser scattering

system we are designing the optics and mounts required to use the

otpical systems on any three of six levels simultaneously. This

design is emphasizing self-compensating aspects of alignment and

ease of change between levels.

Work with Proto I and preliminary tests with the Proto II

test section have shown that the temperature of the windows must

be actively controlled. Initial tests of a window consisting of

r two thin (0.02 in.) sapphire disks with thermostated ethanol

J flowing between them show that it can be cooled and heated

at the rates planned for both the Romulus and Proto II chambers.

Electrical Work

Endurance tests of the power supplies to drive the thermo-

electric modules were successfully completed. The power supplies

are being built in pairs which are mounted on a set of water

cooled heat sinks and an accompaning printed circuit board.

Forty percent of the heat sinks for the 240 power supplies have

been mechanically assembled. The printed circuit board is in

the final stages of layout prior to being sent to a manufacturer.

The cabinets and closed loop coolant system have been assembled

and are ready for wiring.

The nine 37.5 kVA transformers which will supply the raw

power for the thermoelectric power supplies have been received

and mounted in an enclosed cabinet together with the associated

rectifiers.

The analog control circuit for use on the Proto II chamber

is still in the development stage. Several initial designs have

been breadboarded and tested on one section of the chamber set

up for this purpose, however each has proved unsatisfactory due

to excessive offset or instability. Recent results have indicated

that additional response tests are required.

The digital control for the Romulus chamber has been computer

modeled to determine the control algorithm, and type and quantity

of computer hardware required. The modeling has been completed

and specifications for the hardware is being developed.

The design of the transistor thermometers used for tempera-

ture measurement throughout the system ran into an unforeseen

'1 problem when it was discovered that the new sensors did not have

-. 6

the long term stability of the older ones. Consequently a time

consuming and rather sophisticated program. was required to deter-

mine the cause. It was found that the manufacturer had changed

the chip geometry, method of passivating the junction and packag-

ing. The net result was an increase in the susceptibility of the

j-unction to the inbound migration of impurities resulting in an

unacceptable amount of long term drift when the transistor is

used as a temperature sensor. Once the problem was determined,

a search was made for alternative transistors which would be

suitable, the final result was the purchase of special chips

from one manufacturer and special packaging performed by a second

firm. Construction of the new thermometers will proceed as soon

as the new sensors are received.

Third Year Work

The machining of the major components of the Romulus chamber

will be continued during the early part of the third year. Assem-

bly and testing of the Proto II chamber will be pushed during this

period. Design and development of the secondary cooling system

for the Romulus chamber will utilize the computer model which has

been developed for this purpose.

The develop,,ner,.t and testing of the optical hardware will

Pcontinue. Development of the cooled window design will be pushed

to permit early incorporation into the machine work. The multi-

beam laser system will also be developed and tested.

Development of the control systems for both chambers will be

pursued together with the continued work on construction of the

switching power supplies. Construction and installation of the

new transistor thermometers uill also be in progress.

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REPORT. OF INVENTIONS AND SUBCONTRACTS Felon~ AltpeAftsd(Puraueant to "Patent Rlights" Conrract Clou.-e) Oul3ureau No. 22.RI60

INSTRUCTIONS TO CONTRACTORThis (orm" may be used (or INTERIM and FINAL reports. and A FINAL report shall be submitted a&soon as Practicablewhen used shall be completed and forwarded to the Contracting after the work under the contract Is complete and Shall in-Officer in triplicate. clude (a) a summary of all invention$ required by the contract

to be reported, including all inventions previously reportedAnt INTERIM report shall be submitted at least every twelve and any inventionot since the last INTERIM report; and (b)months. commenting with the date of the contract. and should any required information (or subcontroctol which has not pre-include only those inventions and subcontracts for which corn- viously been reported.plate information has not previoow.Iy been reported.I

I. NAME AND AORSS OF CONT04ACTOR (InCluder ZIP COde) 2.CONTRACT NUMBER

University of Missouri-Rolla 'AFOSR F49620-80-C-0090

Graduate Center for Cloud Physics Research a. T TieOFaooar (chock ont)

Roll, M 6541 M. INTENIIM 1Db. FINAL

SECTION I -INVENTIONS ("Subject In ventions" rec&ued to be reported by the "Pi~tent Rights" clause)4. INVENTION DATA (Chock on.)

C3-. THERE WERE NO INVENTIONS WM#CM REASONAOLV APPEAR TO aE PATENTA8LE

Q:16. LISTED SbELOW &AC INVENTIONS WMICh RFASOrIAVLV &-PC&* TO RE PATENTAI E. ANY INVENTION DIScLOSURCs "I.,CHHAVE NO0T SEEN PRIIEvIOuSLY SUeMITTED TO 'THE CONTRACTING OFFICER ARE ATTACHED TO THIS REPORT.

CONTRCTOR CONFItFATORyPATENT COTATR LICENSE ORAPPICAION HAS FILED ASSIGNMENT HAS

NAM OFINVNTO TILE F IVENIONAPPICAION OR WILL FILE BEEN FOttWA.NAE FINETO ITE rINETINSERIAL NUMBER U.S. PATENT E 7 OTAAND CONTRAC- APPLICATION EIN OFCR-

TOR'S DOCKET NO.N OFIE

TE$ No YES 1O

SECTION 11 .SUBCONTRACTS (Containing a "Parent Riolits' clatisc)

S. LISTED BELOW IS INFORMATION REQUIRED BUT NOT PREVIOUSLY REPORTED FOR SUBCONTRACTS. (it noet applocabt.. writte"Iyea0)ru(I)DATE CLAUSE ow DATE

%AME AND AOOAESS OF SUbCONTRACTOR SUBCONTRACT NUMIER FURP4ISNEO TO CON* SUSCONTRACT(Includo ZIP Cede) TRACTING. OFFICER COMPLETED

NONE

SECTION III CERTIFICATE_____________

CONTRACTOR CERTIFIES THAT THIS REPORT OF INVENTIONS At#O SUCCOI4TRACTS. INCLUOING ANY ATTACHMENTS.a IS COfrCnCT TO THE DlEST OF THE CONTRACTOR'S KNOWLEnGir. AN) OELIEF.

OATE AS RAftl TnVLf Or AUTrfOrfIL4:r OFF FetAL (/',.,,w or Jp) t#6NATU r~

7-7-81 Dr. Daniel R. White, Research # f_Associate___Professor______1 '

(~lF" ~ . *o5551. eq~~tIr112~0rI i - I4'