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PreprintarXiv licencearXiv

Bidirectional schlieren imaging using dual-LED illumination and a lens aperture as a knife-edge

  • Vimod Kumar
  • Manish Kumar
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Abstract

In this letter, we demonstrate that employing the Lens Aperture as a Knife-Edge (LAKE) with two identical LEDs has the distinct advantage of obtaining schlieren images along two cutoff orientations. It is possible to control LED brightness to obtain a desirable weighted sum of both horizontal and vertical schlieren cutoff images on each camera frames. Powering the LED sources by an affordable and programmable Arduino board enables a rapid switch between the horizontal and vertical schlieren cutoff that is exactly synced to the camera frames, resulting in crosstalk-free schlieren image sequence. Furthermore, with a little postprocessing, this monochrome image series can be easily transformed into a colorful sequence of bidirectional schlieren images.

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Cite

BibTeXRIS
BibTeX
@misc{kumar2026bidirectional,
  title = {{Bidirectional schlieren imaging using dual-LED illumination and a lens aperture as a knife-edge}},
  author = {Vimod Kumar and Manish Kumar},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.04340},
  eprint = {2610.04340},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.04340},
}
RIS
TY  - UNPB
TI  - Bidirectional schlieren imaging using dual-LED illumination and a lens aperture as a knife-edge
AU  - Vimod Kumar
AU  - Manish Kumar
PY  - 2026
DA  - 2026/10/03
PB  - arXiv
DO  - 10.48550/arxiv.2610.04340
UR  - https://arxiv.org/abs/2610.04340
AB  - In this letter, we demonstrate that employing the Lens Aperture as a Knife-Edge (LAKE) with two identical LEDs has the distinct advantage of obtaining schlieren images along two cutoff orientations. It is possible to control LED brightness to obtain a desirable weighted sum of both horizontal and vertical schlieren cutoff images on each camera frames. Powering the LED sources by an affordable and programmable Arduino board enables a rapid switch between the horizontal and vertical schlieren cutoff that is exactly synced to the camera frames, resulting in crosstalk-free schlieren image sequence. Furthermore, with a little postprocessing, this monochrome image series can be easily transformed into a colorful sequence of bidirectional schlieren images.
ER  -