- Title
- A closed-loop phase-locked interferometer for wide bandwidth position sensing
- Creator
- Fleming, Andrew J.; Routley, Ben; Holdsworth, John L.
- Relation
- 2015 IEEE Conference on Control Applications (CCA). Proceedings of the 2015 IEEE Conference on Control Applications (CCA) ( 21-23 September, 2015) p. 436-440
- Publisher Link
- http://dx.doi.org/10.1109/CCA.2015.7320668
- Publisher
- Institute of Electrical and Electronics Engineers (IEEE)
- Resource Type
- conference paper
- Date
- 2015
- Description
- This article describes a position sensitive interferometer with closed-loop control of the reference mirror. A calibrated nanopositioner is used to lock the interferometer phase to the most sensitive point in the interferogram. In this configuration, large low-frequency movements of the sensor mirror can be detected from the control signal applied to the nanopositioner and high-frequency short-range signals can be measured directly from the photodiode. It is demonstrated that these two signals are complementary and can be summed to find the total displacement. The resulting interferometer has a number of desirable characteristics, it is optically simple, does not require polarization or modulation to detect the direction of motion, does not require fringe-counting or interpolation electronics, and has an effectively unlimited bandwidth. Experimental results demonstrate the frequency response analysis of a high-speed positioning stage. The proposed instrument is ideal for measuring the frequency response of nanopositioners, electro-optical components, MEMs devices, Ultrasonic devices, and sensors such as surface acoustic wave detectors.
- Subject
- mirrors; optical interferometry; nanopositioning; photodiodes; frequency measurement; laser beams
- Identifier
- http://hdl.handle.net/1959.13/1316440
- Identifier
- uon:23173
- Identifier
- ISBN:9781479977871
- Language
- eng
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