Improvements in the evaluation of parabolic trough solar collector using a dynamic flat null-screen

O. Huerta-Carranza, MANUEL CAMPOS-GARCIA, Daniel Aguirre-Aguirre, Brenda Villalobos Mendoza, Víctor Iván Moreno Oliva

Research output: Chapter in Book/Report/Conference proceedingConference contribution


We use the null-screen method to evaluate in a qualitative and quantitative way the shape of a parabolic trough solar collector. When a parabolic trough solar collector is fabricated can occur that the manufacturing errors are large. In some cases, when using the null screen method, the objects in the image plane are overlapped. This problem is solved adequately by placing the CMOS sensor and LCD null-screen in off-axis positions. Also, we propose to display a suitable null-screen on the LCD screen. In the first evaluation the null screen is composed of few object points, in the next evaluation, we change the distribution of objects that compose the null screen with the aim of increasing the measurement points. Finally, the data corresponding to each evaluation is merged in only one set of evaluation data to calculate the surface sagitta from slope measurements of the test surface in the x and y directions.
Original languageEnglish
Title of host publicationSPIE Digital Library Conference Proceedings
Subtitle of host publicationOptical Fabrication, Testing, and Metrology VII
EditorsRoland Geyl, Deitze Otaduy, Reinhard Volkel
ISBN (Electronic)9781510645905
ISBN (Print)0277-786X
Publication statusPublished - 12 Sept 2021

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Bibliographical note

Funding Information:
This research was supported by the Dirección General de Asuntos del Personal Académico, Universidad Nacional Autónoma de México (DGAPA-UNAM) under the projects Programa de Apoyo a Proyectos de Investigación e Inovación Tecnológica (PAPIIT) No: TA100521 and IT100321.

Publisher Copyright:
© 2021 SPIE.

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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