Design of an optical level using the Talbot effect

Alejandra A. Silva; Ramon Rodriguez-Vera

doi:10.1117/12.231111

5 February 1996 Design of an optical level using the Talbot effect

Alejandra A. Silva, Ramon Rodriguez-Vera

Proceedings Volume 2730, Second Iberoamerican Meeting on Optics; (1996) https://doi.org/10.1117/12.231111
Event: Second Iberoamerican Meeting on Optics, 1995, Guanajuato, Mexico

Abstract

An optical arrangement for liquid-level measuring is proposed. The method is based on self- imaging or Talbot effect. Knowing the container dimensions of a liquid, it is possible to obtain the volume changes by the liquid variation in the container. The optical arrangement consists in detecting a diffraction field of a Ronchi grating illuminated by a collimated beam. This field is first reflected by the interface liquid-air, afterwards casting on a second Ronchi grating. This superposition produces a Moire pattern when the Talbot plane of the first grating coincides with the second one. If the travelled path of the wavefront is not a Talbot distance, the Moire pattern is lost. In this way, it is necessary to move the second grating up to see the sharper Moire fringes. The grating change gives directly the level change. Description of the experimental setup and results are shown. Strengths and weaknesses of the method are presented. The future lines of work are given in order to have an automatic and compact instrument.

Citation Download Citation

Alejandra A. Silva and Ramon Rodriguez-Vera "Design of an optical level using the Talbot effect", Proc. SPIE 2730, Second Iberoamerican Meeting on Optics, (5 February 1996); https://doi.org/10.1117/12.231111

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