Particle-sizing system fro scanning electron microscope images of solid-propellant combustion exhaust. PDF
Preview Particle-sizing system fro scanning electron microscope images of solid-propellant combustion exhaust.
NAVAL POSTGRADUATE SCHOOL Monterey, California THESIS m?, PARTICLE-SIZING SYSTEM FOR SCANNING ELECTRON MICROSCOPE IMAGES OF SOLID-PROPELLANT COMBUSTION EXHAUST by Yeaw-Lip Lee March 1991 Thesis Advisor: John P. Powers Approved forpublic release; distribution is unlimited T253660 ».,in IH.i..11II.ii SECURITYCLASSIFICATIONOFTHISPAGE REPORT DOCUMENTATION PAGE 1a REPORTSECURITYCLASSIFICATION lb RESTRICTIVE MARKINGS UNCLASSIFIED 2a SECURITYCLASSIFICATIONAUTHORITY 3 DISTRIBUTION/AVAILABILITYOFREPORT Approvedfor public release;distribution unlimited 2b DECLASSIFICATION/DOWNGRADINGSCHEDULE 4 PERFORMINGORGANIZATIONREPORTNUMBER(S) 5 MONITORINGORGANIZATIONREPORTNUMBER(S) 6a NAMEOFPERFORMINGORGANIZATION 6b OFFICE SYMBOL 7a NAMEOF MONITORINGORGANIZATION Naval Postgraduate School (Ifapplicable) Naval PostgraduateSchool 6c ADDRESS(City,State,andZIPCode) 7b ADDRESS(City,State,andZIPCode) Monterey, CA 93943-5000 Monterey, CA 93943-5000 8a NAMEOF FUNDING/SPONSORING 8b OFFICESYMBOL 9 PROCUREMENTINSTRUMENTIDENTIFICATION NUMBER ORGANIZATION (Ifapplicable) 8c ADDRESS(City,State,andZIPCode) 10 SOURCEOFFUNDINGNUMBERS ProgramElementNo ProjectNo WorkUnitAccession Number 11 TITLE(IncludeSecurityClassification) PARTICLE-SIZING SYSTEM FORSCANNING ELECTRON MICROSCOPE IMAGES OFSOLID- PROPELLANTCOMBUSTION EXHAUST (U) 12 PERSONALAUTHOR(S) LEE.YEAW-LIP 13a TYPEOFREPORT 13b TIMECOVERED 14.DATEOFREPORT(year,month,day) 15 PAGE COUNT Master'sThesis From To March 1991 149 16 SUPPLEMENTARYNOTATION The viewsexpressed in this thesisarethoseoftheauthoranddo notreflecttheofficial policy ofthe Departmentof Defenseorthe U.S. Government 17 COSATICODES 18 SUBJECTTERMS(continueonreverseifnecessaryandidentifybyblocknumber) FIELD GROUP SUBGROUP Particle sizing, SEM, image digitization, image segmentation, rocketmotor, u language 19 ABSTRACT(continueonreverseifnecessaryandidentifybyblocknumber) Accurate measurementofparticle size distribution ofrocketmotor exhausts is essential for predictingthe combustion efficiency and infrared plume signature. This thesis presents an automated method forextractingparticle size distribution from scanning electron microscope (SEM) images. The SEM images were taken offa filter paper placed at the end of a collection probe inserted into the exhaustplume. The automateaSEM extraction system consists ofan IBM AT-based computer system fitted with a 512 x 480 pixel frame grabber. Photographic images taken offthe SEMare acquired via a vidicon camera. A C language program was written to control the hardware and automate the extraction process. A threshold is first applied to the digitized image and the resultingbinary image is subjected to objectsegmentation. Each objectis then sized and the distibution from one ormore images can be plotted. The main bulk ofthis thesis is to documentthe software specially written to undertake this setoftasks. Results obtained were compared with that from a Malvern 20 DISTRIBUTION/AVAILABILITYOFABSTRACT 21 ABSTRACTSECURITYCLASSIFICATION in UNCLASSIFIED/UNLIMITED ] SAMEASREPORT ] DTICUSERS Unclassified 22a NAMEOFRESPONSIBLE INDIVIDUAL 22b TELEPHONE(IncludeAreacode) 22c OFFICE SYMBOL John P. Powers (408)-646-2679 EC/Po DD FORM 1473.84 MAR 83APReditionmaybeuseduntilexhausted SECURITYCLASSIFICATIONOFTHIS PAGE Allothereditionsareobsolete Unclasssified Unclassified SECURITYCLASSIFICATIONOFTHISPAGE MasterSizer particle sizer and found to be favorable. Particles as small as 1/8 microns have been successfully sized. DD Form 1473,JUN 86(Reverse) SECURITYCLASSIFICATIONOFTHISPAGE 11 Unclassified Approved for public release; distribution is unlimited. Particle-Sizing System for Scanning Electron Microscope Images ofSolid-Propellant Combustion Exhaust by Yeaw-LipJ-.ee Civilian, Singapore Ministry ofDefense B.Eng. (Elect), National University ofSingapore, 1985 Submitted in partial fulfillment ofthe requirements for the degree of MASTER OF SCIENCE IN ELECTRICAL ENGINEERING from the NAVALPOSTGRADUATE SCHOOL March 1991 CI ABSTRACT Accurate measurement of particle size distribution of rocket motor exhausts is essential for predicting the combustion efficiency and infrared plume signature. This thesis presents an automated method for extracting particle size distribution from scanning electron microscope (SEM) images. The SEM images were taken off a filter paper placed at the end of a collection probe inserted into the exhaust plume. The automated SEM extraction system consists of an IBM AT-based computer system fitted with a 512 x 480 pixel frame grabber. Photographic images taken off the SEM are acquired via a vidicon camera. A C language program was written to A control the hardware and automate the extraction process. threshold is first applied to the digitized image and the resulting binary image is subjected to object segmentation. Each object is then sized and the distribution from one or more images can be plotted. The main bulk of this thesis is to document the software specially written to undertake this set oftasks. Results obtained were compared with that from a Malvern MasterSizer particle sizer and found to be favorable. Particles as small as 1/8 nm have been successfully sized. IV
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