Measurement of Astronomical Seeing Using Long Exposure Solar Images

Sridharan, R.; Ravindra, B.; Prabhu, K.

doi:10.1007/s11207-019-1393-y

Cited by 3 publications

(1 citation statement)

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“…The exposure time in these experiments ranged from 600 µs to 3200 µs. Finally, Rengaswamy et al [22] applied long-exposure photography to measure astronomic phenomena. The exposure time ranged from 0.7 s to 1 s. To increase the details in the images, they used several overlapping images obtained gradually in the intervals of 10 to 20 s. In our investigation, we could not apply such a procedure due to the short duration of the impact hammer motion and as in each measurement, a motion trajectory was different.…”

Section: Introductionmentioning

confidence: 99%

Long-Exposure RGB Photography with a Fixed Stand for the Measurement of a Trajectory of a Dynamic Impact Device in Real Scale

Kovanič

Ambriško

Marasová

et al. 2021

Sensors

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The present manuscript proposes a novel method for the measurement of a trajectory of a falling impact hammer in the dynamic loading of conveyor belts and the determination of their impact resistance. The proposed method has been experimentally tested and the results of the measurements are presented in this manuscript. The proposed method is based on the long-exposure photography with a long-duration opened shutter of the Nikon D5000 DSLR camera. Results of the experimental research were compared with direct reference measurements performed using the L-GAGE LT3 laser distance sensor. Differences between values, obtained by the new method and by the reference measurements were up to ±3 mm. The standard deviation identified in all the experiments was 1 mm.

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Section: Introductionmentioning

confidence: 99%