Difference between revisions of "Lab 1 Report -- Nathan S Lachenmyer"
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===E Coli=== | ===E Coli=== | ||
[[File:ecoli.png]] | [[File:ecoli.png]] | ||
| − | The frequencies here are not properly calibrated until I get the DAQ bandwidth. There are obvious peaks at what are (now) 10, 20, and 40 Hz -- I think these are the harmonics of the e coli rotation, and once the abscissa is properly scaled will give the e coli rotation speed. | + | |
| + | The frequencies here are not properly calibrated until I get the DAQ bandwidth. There are obvious peaks at what are (now) 10, 20, and 40 Hz -- I think these are the harmonics of the e coli rotation, and once the abscissa is properly scaled will give the e coli rotation speed. There looks like there is also a peak hidden in the DC peak. | ||
===DNA Tethers=== | ===DNA Tethers=== | ||
[[File:dna_raw.png]] | [[File:dna_raw.png]] | ||
Revision as of 04:17, 2 March 2012
Contents
Calibration
All calibrations and experiments done at 20 mW.
Position Calibration
calibration: 502463 Volts / m = 1.99 um / volt
Trap Stiffness Calibration
| Method | Trap Stiffness (pN / nm) |
|---|---|
| Stokes | 2.26e-5 pN/nm |
| Equipartition Theorem | 1.23e-5 pN/nm |
| PSD | *Need Bandwidth of DAQ* |
Experiments
E Coli
The frequencies here are not properly calibrated until I get the DAQ bandwidth. There are obvious peaks at what are (now) 10, 20, and 40 Hz -- I think these are the harmonics of the e coli rotation, and once the abscissa is properly scaled will give the e coli rotation speed. There looks like there is also a peak hidden in the DC peak.
DNA Tethers
