High bandwidth force estimation for optical tweezers
| Autor: | Murti V. Salapaka, Tanuj Aggarwal, Hullas Sehgal |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
Physics
Quantitative Biology::Biomolecules Physics and Astronomy (miscellaneous) business.industry Differential equation Acoustics Bandwidth (signal processing) Open-loop controller Photodetector Clamping Photodiode law.invention Condensed Matter::Soft Condensed Matter Optics Optical tweezers law mental disorders business Order of magnitude |
| Zdroj: | Applied Physics Letters. 94:153114 |
| ISSN: | 1077-3118 0003-6951 |
| DOI: | 10.1063/1.3116621 |
| Popis: | A prevalent mode of optical tweezers involves position clamping that regulates a constant position of a trapped bead. Traditional schemes employ the measured bead position in the open loop or the control signal in the position-clamp mode as an estimate of external force on the trapped bead. This article shows that traditional methods introduce fundamental limitations on bandwidth of the external force estimation. A method is presented that leads to an order of magnitude increase in the bandwidth of the external force estimation. Furthermore, a comprehensive modeling paradigm is introduced that facilitates estimation of forces on the bead. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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