PMID- 36255970
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20221019
IS  - 1539-4522 (Electronic)
IS  - 1559-128X (Linking)
VI  - 61
IP  - 16
DP  - 2022 Jun 1
TI  - Methodology of designing compact schlieren systems using off-axis parabolic 
      mirrors.
PG  - 4857-4864
LID - 10.1364/AO.457151 [doi]
AB  - Schlieren imaging is widely adopted in applications where fluid dynamics features 
      are of interest. However, traditional Z-type schlieren systems utilizing on-axis 
      mirrors generally require large system footprints due to the need to use high 
      f-number mirrors. In this context, off-axis parabolic (OAP) mirrors provide an 
      attractive alternative for permitting the use of smaller f-number optics, but 
      well-documented methodologies for designing schlieren systems with OAP mirrors 
      are lacking. The present work outlines a ray-tracing-based workflow applied to 
      the design of a modified Z-type schlieren system utilizing OAP mirrors. The 
      ray-tracing analysis evaluates the defocus and distortion introduced by schlieren 
      optics. The results are used along with system size and illumination efficiency 
      considerations to inform the selection of optimal optical components capable of 
      producing high-quality schlieren images while minimizing the system footprint. As 
      a step-by-step demonstration of the design methodology, an example schlieren 
      system design is presented. The example schlieren design achieved an image 
      resolution of 1.1 lp/mm at 50% contrast, with a 60% reduction in system length 
      compared to traditional Z-type systems with f/8 mirrors; distortion 
      characterizations of the designed schlieren system showed good agreement with 
      ray-tracing predictions, and the distortion can be corrected through image 
      post-processing. The current work provides a systematic approach for the design 
      of compact schlieren systems with OAP mirrors and demonstrates the utility of 
      this underutilized option.
FAU - Zheng, Lingzhi
AU  - Zheng L
FAU - Susa, Adam J
AU  - Susa AJ
FAU - Hanson, Ronald K
AU  - Hanson RK
LA  - eng
PT  - Journal Article
PL  - United States
TA  - Appl Opt
JT  - Applied optics
JID - 0247660
SB  - IM
EDAT- 2022/10/19 06:00
MHDA- 2022/10/19 06:01
CRDT- 2022/10/18 11:44
PHST- 2022/10/18 11:44 [entrez]
PHST- 2022/10/19 06:00 [pubmed]
PHST- 2022/10/19 06:01 [medline]
AID - 473127 [pii]
AID - 10.1364/AO.457151 [doi]
PST - ppublish
SO  - Appl Opt. 2022 Jun 1;61(16):4857-4864. doi: 10.1364/AO.457151.