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An optically referenced inclinometer with sub-microradian repeatability
- Source :
- Review of Scientific Instruments. 88:115111
- Publication Year :
- 2017
- Publisher :
- AIP Publishing, 2017.
-
Abstract
- A pendulum inclinometer has been built and tested, suitable for measuring the deflection of the gravitational vertical to an accuracy of 1 μrad. The design is based on measuring the differential capacitance between a pendulum bob and two closely spaced parallel electrodes. Two independent pendulums are oriented orthogonally to measure both coordinates. A collimated optical beam is stably attached to the inclinometer pair and provides a means for making stellar measurements relative to the gravitational vertical. For optimum performance, the inclinometer is operated at its null position by supporting the entire assembly on a rigid tilting plate. Good repeatability is a key feature of this inclinometer.
Details
- ISSN :
- 10897623 and 00346748
- Volume :
- 88
- Database :
- OpenAIRE
- Journal :
- Review of Scientific Instruments
- Accession number :
- edsair.doi.dedup.....6b893419df683a50545bcf8fd349b192