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학술지 Pattern-Projected Schlieren Imaging Method using a Diffractive Optics Element
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저자
민기현, 이병탁, 김낙우, 이문섭
발행일
201803
출처
Measurement Science and Technology, v.29 no.4, pp.1-9
ISSN
0957-0233
출판사
Institute of Physics (IOP)
DOI
https://dx.doi.org/10.1088/1361-6501/aaa6ed
협약과제
18ZK1100, 호남권 지역산업 기반 ICT융합기술 고도화 지원사업, 이동수
초록
We propose a novel schlieren imaging method by projecting a random dot pattern, which is generated in a light source module that includes a diffractive optical element. All apparatuses are located in the source side, which leads to one-body sensor applications. This pattern is distorted by the deflections of schlieren objects such that the displacement vectors of random dots in the pixels can be obtained using the particle image velocity algorithm. The air turbulences induced by a burning candle, boiling pot, heater, and gas torch were successfully imaged, and it was shown that imaging up to a size of 0.7 m × 0.57 m is possible. An algorithm to correct the non-uniform sensitivity according to the position of a schlieren object was analytically derived. This algorithm was applied to schlieren images of lenses. Comparing the corrected versions to the original schlieren images, we showed a corrected uniform sensitivity of 14.15 times on average.
KSP 제안 키워드
Body sensor, Diffractive optical elements, Displacement vectors, Dot pattern, Imaging method, Light sources, Non-uniform, Schlieren imaging, sensor applications