DIMM with large aperture separation and simultaneous seeing measurements at Mauna Kea

Fumihiro Uraguchi; Naruhisa Takato; Akihiko Miyashita; Kenshi Yanagisawa; Norio Okada

doi:10.1117/12.458226

4 February 2003 DIMM with large aperture separation and simultaneous seeing measurements at Mauna Kea

Fumihiro Uraguchi, Naruhisa Takato, Akihiko Miyashita, Kenshi Yanagisawa, Norio Okada

Proceedings Volume 4837, Large Ground-based Telescopes; (2003) https://doi.org/10.1117/12.458226
Event: Astronomical Telescopes and Instrumentation, 2002, Waikoloa, Hawai'i, United States

Abstract

We developed two DIMMs (Differential Image Motion Monitor) for simultaneous seeing measurements at multiple sites. Simultaneous seeing measurements enable us to distinguish temporal variation and site to site variation of seeing, and clarify which site has better seeing. We set the aperture separation of the DIMM at 50 cm for accurate measurements under good (~0.3 arcsec) seeing conditions for Mauna Kea. Our system can also be tuned for moderate to bad seeing conditions by changing the effective focal length of the optics. The frame of our DIMM device is made of CFRP in order to avoid deformation with temperature change and to reduce its weight. We will present the details of our DIMM system and some results of simultaneous seeing measurements at Mauna Kea, Hawaii.

Citation Download Citation

Fumihiro Uraguchi, Naruhisa Takato, Akihiko Miyashita, Kenshi Yanagisawa, and Norio Okada "DIMM with large aperture separation and simultaneous seeing measurements at Mauna Kea", Proc. SPIE 4837, Large Ground-based Telescopes, (4 February 2003); https://doi.org/10.1117/12.458226

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