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Two-channel six degrees of freedom grating-encoder for precision-positioning of sub-components in synthetic-aperture optics
- Source :
- Optics Express. 29:21113
- Publication Year :
- 2021
- Publisher :
- Optica Publishing Group, 2021.
-
Abstract
- We investigate a novel two-channel grating encoder that can perform simultaneous measurements of six-degree-of-freedom (DOF) motions of two adjacent sub-components of synthetic-aperture optics such as pulse-compression gratings(PCGs) and telescope-primary mirrors. The grating encoder consists of a reading head and two separate gratings, which are attached to the back of the sub-components, respectively. The reading head is constructed such that there two identical optical probes can share the same optical components. The two probes are guided to hit each of the two gratings and can detect six-DOF motions simultaneously and independently. For each probe, the incident beam propagates through both a three-axes grating interferometry module and a three-axes diffraction integrated autocollimator-module, which detects translational and rotational movement, respectively. By combining the two modules it is possible to perform six-DOF measurement for a single point. The common-path configuration of the two probes enable identical responses to environmental variation, which ensures high accuracy.
- Subjects :
- Synthetic aperture radar
Physics
Diffraction
Channel (digital image)
business.industry
Reading (computer)
Physics::Optics
02 engineering and technology
Grating
021001 nanoscience & nanotechnology
01 natural sciences
Atomic and Molecular Physics, and Optics
010309 optics
Optics
0103 physical sciences
Six degrees of freedom
Head (vessel)
0210 nano-technology
business
Encoder
Subjects
Details
- ISSN :
- 10944087
- Volume :
- 29
- Database :
- OpenAIRE
- Journal :
- Optics Express
- Accession number :
- edsair.doi.dedup.....21a5039fdb5168045b1b6d1694769be5
- Full Text :
- https://doi.org/10.1364/oe.427307