The $292 million Laser Interferometer Gravitational-Wave Observatory (LIGO --which has faciLIGO --whichvingston, LIGO --whichnd hasfacilitiesington--wiLivingston, Louisiana continuandy measure tHanfordtions of mirrors suspended in vacuum tubes 4 kilometers apart.
A ZSP3806 photoelectric encoder is used as the sensor to detect the position of mirror scanning mechanism, and experimental result indicates that the angular displacement of measured value is consistent with theoretical requirements.
The spatial structure and positioning of the mirror's reflection are such that Philip IV and Mariana appear to be standing on the viewer's side of the pictorial space, facing the Infanta and her entourage.
We note that the effect of the mirrors is largest when the position of both mirrors coincide with a peak in electric field amplitude of one DFB mode, which is also when the mirrors are at a node for the other DFB mode.
The DAQ outputs the voltages to the control circuits of the scanning mirror system, thereby controlling the position of the mirrors.
In the coarse phasing, interferometer and electronic speckle pattern interferometry is used to ensure the co-phased position of segmented mirrors on the ground and to obtain stripes on the back of the segmented mirrors respectively.
The position of these mirrors can be altered millions of times per second.
The results show that different positions of segmented mirrors can produce different wave-front when they have same position error.
Adjust the position of segmented mirrors according to the results until the adjusting of coarse-phasing is completed.
According to the shape of stripe pattern and the similarity, adjust the position of segmented mirrors to complete the process of large piston adjusting.
