A facility to evaluate the focusing performance of mirrors for Cherenkov Telescopes

Canestrari, R.; Giro, E.; Bonnoli, G.; Farisato, G.; Lessio, L.; Rodeghiero, Gabriele; Spiga, Rossella; Toso, Giorgio; Pareschi, G.

doi:10.1016/j.nima.2015.09.092

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Cited by 5 publications

(1 citation statement)

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“…A 2f system [25][26][27][28] was mounted in order to measure the PSF and focal length of the mirrors. Its parts were a variable height tripod, a high-power blue LED collimated by simple lenses to work as a point source, a white screen to observe the image formed by the mirrors, a laser distance meter to measure the distance of the system from the mirror and a commercial digital camera.…”

Section: Discussionmentioning

confidence: 99%

On-site mirror facet condensation measurements for the Cherenkov Telescope Array

Dipold

Medina

Garcia-Pinto

et al. 2016

Nuclear Instruments and Methods in Physics Research Section A:

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Section: Discussionmentioning

confidence: 99%

On-site mirror facet condensation measurements for the Cherenkov Telescope Array

Dipold

Medina

Garcia-Pinto

et al. 2016

Nuclear Instruments and Methods in Physics Research Section A:

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The Cherenkov optics qualification facilities at INAF-OAB laboratories

Sironi

Canestrari

Giro

et al. 2020

Nuclear Instruments and Methods in Physics Research Section A:

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Evaluation of novel approach to deflectometry for high accuracy optics

et al. 2016

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A deflectometrical facility was developed at Italian National Institute for Astrophysics-OAB to characterize free-form optics with shape errors within few microns rms. Deflectometry is an interesting technique because it allows the fast characterization of free-form optics. The capabilities of deflectometry in measuring medium-high frequencies are well known, but the low frequencies error characterization is more challenging. Our facility design foresees an innovative approach based on the acquisition of multiple direct images to enhance the performance on the challenging low frequencies range. This contribution presents the error-budget analysis of the measuring method and a study of the configuration tolerances required to allow the use of deflectometry in the realization of optical components suitable for astronomical projects with a requirement of high accuracy for the optics. As test examples we took into account mirrors for the E-ELT telescope

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A facility to evaluate the focusing performance of mirrors for Cherenkov Telescopes

Cited by 5 publications

References 13 publications

On-site mirror facet condensation measurements for the Cherenkov Telescope Array

On-site mirror facet condensation measurements for the Cherenkov Telescope Array

The Cherenkov optics qualification facilities at INAF-OAB laboratories

Evaluation of novel approach to deflectometry for high accuracy optics

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