Results 201 to 210 of about 136,660 (228)
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Applied Optics, 2022
A laser-illuminated differential image motion monitor (DIMM) is presented that is able to measure the atmospheric coherence length r 0 along horizontal ground paths. This is accomplished by implementing a mono-static setup in which the transmitter and receiver are co-located and transmit to a retroreflective ...
Randall, Hanna +3 more
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A laser-illuminated differential image motion monitor (DIMM) is presented that is able to measure the atmospheric coherence length r 0 along horizontal ground paths. This is accomplished by implementing a mono-static setup in which the transmitter and receiver are co-located and transmit to a retroreflective ...
Randall, Hanna +3 more
openaire +4 more sources
Journal of Modern Optics, 2019
ABSTRACTThe present study aims to evaluate the possibility of simultaneous measurements of Fried parameter and atmospheric Zernike defocus by measuring defocus aberration with 4-aperture differential image motion monitor (DIMM) for a portable telescope.
B. Dibaee +4 more
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ABSTRACTThe present study aims to evaluate the possibility of simultaneous measurements of Fried parameter and atmospheric Zernike defocus by measuring defocus aberration with 4-aperture differential image motion monitor (DIMM) for a portable telescope.
B. Dibaee +4 more
openaire +3 more sources
Study on the Measurement of Coherence Length by Differential Image Motion Monitor
Acta Optica Sinica, 2013于龙昆 Yu Longkun +3 more
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Mobile Differential Image Motion Monitor for Astroclimate Research
Astrophysical BulletinS. A. Potanin +2 more
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Numerical simulation of a large area scintillometer and laser differential image motion monitor
Applied Optics, 2021Measurements of atmospheric turbulence along a path can be quantified by scintillometers and differential image motion monitors (DIMMs). The two instruments often measure different levels of turbulence, sometimes varying by nearly an order of magnitude.
David M, Brown +4 more
openaire +2 more sources
Design for transmissive differential image motion seeing monitor system
SPIE Proceedings, 2013A Transmissive differential image motion monitor (DIMM) optical system is introduced, which composed of two identical transmissive optical systems. This two transmissive optical system is composed of two pupil required by DIMM. Compared with traditional reflective DIMM optical system, this new type of DIMM system has a simple structure, small size ...
Lun Jiang +3 more
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A Hartmann Differential Image Motion Monitor (H-DIMM) for Atmospheric Turbulence Characterisation
Publications of the Astronomical Society of Australia, 1996AbstractWe describe the use of a multi-aperture Hartmann mask coupled to a slightly out-of-focus focal plane array imager to monitor atmospheric turbulence (‘seeing’) produced by refractive index fluctuations. The imager (a CCD) is located inside or outside the focal surface of the imaging system so that each sub-aperture of the Hartmann mask produces ...
John Bally +6 more
openaire +1 more source
Applied Optics, 2013
A laser differential image-motion monitor (DIMM) system was designed and constructed as part of a turbulence characterization suite during the DARPA free-space optical experimental network experiment (FOENEX) program. The developed link measurement system measures the atmospheric coherence length (r0), atmospheric scintillation, and power in the bucket
David M, Brown +2 more
openaire +2 more sources
A laser differential image-motion monitor (DIMM) system was designed and constructed as part of a turbulence characterization suite during the DARPA free-space optical experimental network experiment (FOENEX) program. The developed link measurement system measures the atmospheric coherence length (r0), atmospheric scintillation, and power in the bucket
David M, Brown +2 more
openaire +2 more sources