Instrumentation, Techniques, and Measurement

Design of a single flat null-screen for testing a parabolic trough solar collector

[+] Author Affiliations
Víctor Iván Moreno-Oliva

Universidad del Istmo, Campus Tehuantepec, Ciudad Universitaria S/N, Barrio Santa Cruz, Cuarta Sección, Santo Domingo Tehuantepec, Oaxaca, C.P. 70760, México

Manuel Campos-García

Universidad Nacional Autónoma de México, Centro de Ciencias Aplicadas y Desarrollo Tecnológico, Circuito exterior S/N, Ciudad Universitaria, AP 70-186, C.P. 04510, México D.F., México

Edwin Román-Hernández

Universidad del Istmo, Campus Tehuantepec, Ciudad Universitaria S/N, Barrio Santa Cruz, Cuarta Sección, Santo Domingo Tehuantepec, Oaxaca, C.P. 70760, México

Agustín Santiago-Alvarado

Universidad Tecnológica de la Mixteca UTM, Carretera Acatlima Km 2.5, Huajuapan de León Oaxaca, C. P. 69000, México

Opt. Eng. 53(11), 114108 (Nov 20, 2014). doi:10.1117/1.OE.53.11.114108
History: Received September 9, 2014; Accepted October 23, 2014
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Abstract.  We present a null-screen design for testing the shape quality of the reflecting surface of a parabolic trough solar collector (PTSC). This technique is inexpensive, the whole surface is tested at once, and it is easy to implement. For this, we propose the design of a flat null-screen perpendicular to the optical axis of the PTSC in such a way that it allows testing of the full aperture; we compute the caustic associated with the reflected light rays on the desired surface and analyze the parameters that determine the null-screen dimensions. Additionally, we perform a numerical simulation to analyze the accuracy of the method by introducing random displacement errors into the measured data. Accuracies >0.35mrad were found to evaluate the quality of surfaces with this method. The errors in the determination of the coordinates of the centroids of the reflected images must be measured with an accuracy >0.5pixels, and the errors in the coordinates of the spots of the null-screen must be <0.5mm.

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© 2014 Society of Photo-Optical Instrumentation Engineers

Citation

Víctor Iván Moreno-Oliva ; Manuel Campos-García ; Edwin Román-Hernández and Agustín Santiago-Alvarado
"Design of a single flat null-screen for testing a parabolic trough solar collector", Opt. Eng. 53(11), 114108 (Nov 20, 2014). ; http://dx.doi.org/10.1117/1.OE.53.11.114108


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