dorsal/arxiv
View SchemaThe effect of integration time on fluctuation measurements: calibrating an optical trap in the presence of motion blur
| Authors | Wesley P. Wong, Ken Halvorsen |
|---|---|
| Categories | |
| ArXiv ID | physics/0607156 |
| URL | https://arxiv.org/abs/physics/0607156 |
| DOI | 10.1364/OE.14.012517 |
| Journal | Opt.Express 14:12517-12531,2006 |
Abstract
Dynamical instrument limitations, such as finite detection bandwidth, do not simply add statistical errors to fluctuation measurements, but can create significant systematic biases that affect the measurement of steady-state properties. Such effects must be considered when calibrating ultra-sensitive force probes by analyzing the observed Brownian fluctuations. In this article, we present a novel method for extracting the true spring constant and diffusion coefficient of a harmonically confined Brownian particle that extends the standard equipartition and power spectrum techniques to account for video-image motion blur. These results are confirmed both numerically with a Brownian dynamics simulation, and experimentally with laser optical tweezers.
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"abstract": "Dynamical instrument limitations, such as finite detection bandwidth, do not\nsimply add statistical errors to fluctuation measurements, but can create\nsignificant systematic biases that affect the measurement of steady-state\nproperties. Such effects must be considered when calibrating ultra-sensitive\nforce probes by analyzing the observed Brownian fluctuations. In this article,\nwe present a novel method for extracting the true spring constant and diffusion\ncoefficient of a harmonically confined Brownian particle that extends the\nstandard equipartition and power spectrum techniques to account for video-image\nmotion blur. These results are confirmed both numerically with a Brownian\ndynamics simulation, and experimentally with laser optical tweezers.",
"arxiv_id": "physics/0607156",
"authors": [
"Wesley P. Wong",
"Ken Halvorsen"
],
"categories": [
"physics.bio-ph",
"physics.ins-det",
"physics.optics"
],
"doi": "10.1364/OE.14.012517",
"journal_ref": "Opt.Express 14:12517-12531,2006",
"title": "The effect of integration time on fluctuation measurements: calibrating an optical trap in the presence of motion blur",
"url": "https://arxiv.org/abs/physics/0607156"
},
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