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Ultrafast Laser-Absorption Spectroscopy in the Mid-Infrared for Spatiotemporally Resolved Measurements of Gas Properties- [electronic resource]
Ultrafast Laser-Absorption Spectroscopy in the Mid-Infrared for Spatiotemporally Resolved ...
Ultrafast Laser-Absorption Spectroscopy in the Mid-Infrared for Spatiotemporally Resolved Measurements of Gas Properties- [electronic resource]

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자료유형  
 학위논문(국외)
자관 청구기호  
기본표목-개인명  
표제와 책임표시사항  
Ultrafast Laser-Absorption Spectroscopy in the Mid-Infrared for Spatiotemporally Resolved Measurements of Gas Properties - [electronic resource] / Ryan J Tancin
발행, 배포, 간사 사항  
[S.l.] : Purdue University. , 2021
    발행, 배포, 간사 사항  
    Ann Arbor : ProQuest Dissertations & Theses , 2021
      형태사항  
      1 online resource(p.181 )
      일반주기  
      Source: Dissertations Abstracts International, Volume: 85-01, Section: B.
      일반주기  
      Advisor: Goldenstein, Christopher S.
      학위논문주기  
      Thesis (Ph.D.)--Purdue University, 2021.
      이용제한주기  
      This item must not be sold to any third party vendors.
      요약 등 주기  
      요약Laser-absorption spectroscopy (LAS) is widely used for providing non-intrusive and quantitative measurements of gas properties (such as temperature and absorbing species mole fraction) in combustion environments. However, challenges may arise from the line-of-sight nature of LAS diagnostics, which can limit their spatial resolution and can complicate accurate interpretation of LAS measurements. Further, time-resolution of such techniques as scanned direct-absorption or wavelength-modulation spectroscopy is limited by the scanning speed of the laser and the optical bandwidth is often limited by a combination of a laser's intrinsic tunability and its scanning speed. The work presented in this dissertation investigated how recent advancements in mid-IR camera technology and lasers can be leveraged to expand the spatial, temporal, and spectral measurement capabilities of LAS diagnostics. In addition, the high-pressure combustion chamber (HPCC) and high-pressure shock tube (HPST) were designed and built to enable the study of, among others, energetic material combustion, spectroscopy, non-equilibrium and chemistry using optical diagnostics.A brief overview of laser absorption spectroscopy is provided. The fundamental principles of absorption spectroscopy and statistical mechanics are described. Various physical and instrumental broadening mechanisms which are relevant to this dissertation are discussed.The design and initial application of the HPCC is also presented in this work. The HPCC exhibits several unique design attributes which mitigate some of the challenges which complicate optical characterization of flames at high-pressure. The HPCC employs a flangeless and weldless design to provide a compact, easy to access, and relatively light weight (for its size and pressure capability) test chamber. It is capable of operating at pressures from vacuum to 206 bar, and it enables laser or wire ignition of propellants and energetic materials to be preformed. Some of the HPCC's testing capabilities are demonstrated via optical characterization of laser-ignited HMX flames. Laser-absorption-spectroscopy measurements of temperature and CO at 2 bar and high-speed IR imaging and at pressures from 2 to 25 bar are presented.The design and initial application of a mid-infrared laser-absorption-imaging (LAI) technique for two-dimensional (2D) measurements and tomographic reconstruction of gas temperature and CO in laminar flames is presented. In this technique, the output beam from a quantum-cascade laser (QCL) is expanded, passed through the test gas, and imaged in 2D using a high-speed mid-infrared camera. The wavelength of the QCL is scanned across the P(0,20) and P(1,14) transitions of CO near 4.8 µm at 50 Hz to provide 2D measurements of path-integrated gas temperature and CO column density across over 3,300 lines-of-sight simultaneously. This enabled the first sub-second (0.1 s), high-resolution (140 µm), 2D laser-absorption measurements and tomographic reconstruction of flame temperature and CO mole fraction using mid-infrared wavelengths. Prior to entering the test gas, the beam was reflected off two diffusers spinning at 90,000 RPM (≈9400 rad/s) to break the laser's coherence and prevent diffraction-induced image artifacts. This technique was validated with measurements of CO in an isothermal jet and then demonstrated in laminar, partially premixed, oxygen-ethylene flames despite large background emission from soot and combustion products.Next, the development of an ultrafast (i.e., femtosecond), mid-infrared, laser-absorption diagnostic and its initial application to measuring temperature, CO, and CH4 in flames is presented. This diagnostic offers several unique advantages: (1) ultrafast (sub-nanosecond) time resolution, (2) access to strong fundamental absorption bands located throughout the mid-IR using a single light source and camera, and (3) potential for single-shot, spatially resolved (1D) thermometry and species measurements at 5 kHz. The diagnostic employs a Ti:sapphire oscillator emitting 55-fs pulses near 800 nm which were amplified and converted into the mid-infrared though optical parametric amplification (OPA) at a repetition rate of 5 kHz. The pulses were directed through the test gas and focused into an imaging spectrometer where they were dispersed and recorded using a high-speed, mid-infrared camera.
      주제명부출표목-일반주제명  
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      주제명부출표목-일반주제명  
      주제명부출표목-일반주제명  
      주제명부출표목-일반주제명  
      주제명부출표목-일반주제명  
      주제명부출표목-일반주제명  
      부출표목-단체명  
      기본자료저록  
      Dissertations Abstracts International. 85-01B.
      기본자료저록  
      Dissertation Abstract International
      전자적 위치 및 접속  
       원문정보보기
      소장사항  
      202402 2024

      MARC

       008240306s2021        s  |          s        0000c|  eng  d
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      ■007cr
      ■020    ▼a9798379843687
      ■035    ▼a(MiAaPQ)AAI30505151
      ■035    ▼a(MiAaPQ)Purdue14497758
      ■040    ▼aMiAaPQ▼cMiAaPQ
      ■08204▼a004
      ■090    ▼a전자도서(박사논문)
      ■1001  ▼aTancin,  Ryan  J.
      ■24510▼aUltrafast  Laser-Absorption  Spectroscopy  in  the  Mid-Infrared  for  Spatiotemporally  Resolved  Measurements  of  Gas  Properties▼h[electronic  resource]▼cRyan  J  Tancin
      ■260    ▼a[S.l.]▼bPurdue  University.  ▼c2021
      ■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2021
      ■300    ▼a1  online  resource(p.181  )
      ■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-01,  Section:  B.
      ■500    ▼aAdvisor:  Goldenstein,  Christopher  S.
      ■5021  ▼aThesis  (Ph.D.)--Purdue  University,  2021.
      ■506    ▼aThis  item  must  not  be  sold  to  any  third  party  vendors.
      ■520    ▼aLaser-absorption  spectroscopy  (LAS)  is  widely  used  for  providing  non-intrusive  and  quantitative  measurements  of  gas  properties  (such  as  temperature  and  absorbing  species  mole  fraction)  in  combustion  environments.  However,  challenges  may  arise  from  the  line-of-sight  nature  of  LAS  diagnostics,  which  can  limit  their  spatial  resolution  and  can  complicate  accurate  interpretation  of  LAS  measurements.  Further,  time-resolution  of  such  techniques  as  scanned  direct-absorption  or  wavelength-modulation  spectroscopy  is  limited  by  the  scanning  speed  of  the  laser  and  the  optical  bandwidth  is  often  limited  by  a  combination  of  a  laser's  intrinsic  tunability  and  its  scanning  speed.  The  work  presented  in  this  dissertation  investigated  how  recent  advancements  in  mid-IR  camera  technology  and  lasers  can  be  leveraged  to  expand  the  spatial,  temporal,  and  spectral  measurement  capabilities  of  LAS  diagnostics.  In  addition,  the  high-pressure  combustion  chamber  (HPCC)  and  high-pressure  shock  tube  (HPST)  were  designed  and  built  to  enable  the  study  of,  among  others,  energetic  material  combustion,  spectroscopy,  non-equilibrium  and  chemistry  using  optical  diagnostics.A  brief  overview  of  laser  absorption  spectroscopy  is  provided.  The  fundamental  principles  of  absorption  spectroscopy  and  statistical  mechanics  are  described.  Various  physical  and  instrumental  broadening  mechanisms  which  are  relevant  to  this  dissertation  are  discussed.The  design  and  initial  application  of  the  HPCC  is  also  presented  in  this  work.  The  HPCC  exhibits  several  unique  design  attributes  which  mitigate  some  of  the  challenges  which  complicate  optical  characterization  of  flames  at  high-pressure.  The  HPCC  employs  a  flangeless  and  weldless  design  to  provide  a  compact,  easy  to  access,  and  relatively  light  weight  (for  its  size  and  pressure  capability)  test  chamber.  It  is  capable  of  operating  at  pressures  from  vacuum  to  206  bar,  and  it  enables  laser  or  wire  ignition  of  propellants  and  energetic  materials  to  be  preformed.  Some  of  the  HPCC's  testing  capabilities  are  demonstrated  via  optical  characterization  of  laser-ignited  HMX  flames.  Laser-absorption-spectroscopy  measurements  of  temperature  and  CO  at  2  bar  and  high-speed  IR  imaging  and  at  pressures  from  2  to  25  bar  are  presented.The  design  and  initial  application  of  a  mid-infrared  laser-absorption-imaging  (LAI)  technique  for  two-dimensional  (2D)  measurements  and  tomographic  reconstruction  of  gas  temperature  and  CO  in  laminar  flames  is  presented.  In  this  technique,  the  output  beam  from  a  quantum-cascade  laser  (QCL)  is  expanded,  passed  through  the  test  gas,  and  imaged  in  2D  using  a  high-speed  mid-infrared  camera.  The  wavelength  of  the  QCL  is  scanned  across  the  P(0,20)  and  P(1,14)  transitions  of  CO  near  4.8  µm  at  50  Hz  to  provide  2D  measurements  of  path-integrated  gas  temperature  and  CO  column  density  across  over  3,300  lines-of-sight  simultaneously.  This  enabled  the  first  sub-second  (0.1  s),  high-resolution  (140  µm),  2D  laser-absorption  measurements  and  tomographic  reconstruction  of  flame  temperature  and  CO  mole  fraction  using  mid-infrared  wavelengths.  Prior  to  entering  the  test  gas,  the  beam  was  reflected  off  two  diffusers  spinning  at  90,000  RPM  (≈9400  rad/s)  to  break  the  laser's  coherence  and  prevent  diffraction-induced  image  artifacts.  This  technique  was  validated  with  measurements  of  CO  in  an  isothermal  jet  and  then  demonstrated  in  laminar,  partially  premixed,  oxygen-ethylene  flames  despite  large  background  emission  from  soot  and  combustion  products.Next,  the  development  of  an  ultrafast  (i.e.,  femtosecond),  mid-infrared,  laser-absorption  diagnostic  and  its  initial  application  to  measuring  temperature,  CO,  and  CH4  in  flames  is  presented.  This  diagnostic  offers  several  unique  advantages:  (1)  ultrafast  (sub-nanosecond)  time  resolution,  (2)  access  to  strong  fundamental  absorption  bands  located  throughout  the  mid-IR  using  a  single  light  source  and  camera,  and  (3)  potential  for  single-shot,  spatially  resolved  (1D)  thermometry  and  species  measurements  at  5  kHz.  The  diagnostic  employs  a  Ti:sapphire  oscillator  emitting  55-fs  pulses  near  800  nm  which  were  amplified  and  converted  into  the  mid-infrared  though  optical  parametric  amplification  (OPA)  at  a  repetition  rate  of  5  kHz.  The  pulses  were  directed  through  the  test  gas  and  focused  into  an  imaging  spectrometer  where  they  were  dispersed  and  recorded  using  a  high-speed,  mid-infrared  camera.
      ■590    ▼aSchool  code:  0183.
      ■650  4▼aData  processing.
      ■650  4▼aTomography.
      ■650  4▼aSpectrum  analysis.
      ■650  4▼aLasers.
      ■650  4▼aAnalytical  chemistry.
      ■650  4▼aChemistry.
      ■650  4▼aMedical  imaging.
      ■650  4▼aOptics.
      ■690    ▼a0486
      ■690    ▼a0485
      ■690    ▼a0574
      ■690    ▼a0752
      ■71020▼aPurdue  University.
      ■7730  ▼tDissertations  Abstracts  International▼g85-01B.
      ■773    ▼tDissertation  Abstract  International
      ■790    ▼a0183
      ■791    ▼aPh.D.
      ■792    ▼a2021
      ■793    ▼aEnglish
      ■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T16932664▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.
      ■980    ▼a202402▼f2024

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