Difference between revisions of "Spring 2012:Vincent Lee Lab 2"
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=== Laser Alignment === | === Laser Alignment === | ||
* The laser could be aligned using two 2-degrees tunable mirrors, allowing both angle and position of the beam to be controlled. | * The laser could be aligned using two 2-degrees tunable mirrors, allowing both angle and position of the beam to be controlled. | ||
+ | == Data Acquisition == | ||
+ | === Actual PSF === | ||
+ | === Theoretical PSF === | ||
+ | == Results == | ||
+ | == Results == | ||
+ | {| width="50%" align="center" | ||
+ | | [[File:PSF-3Dview2012.png|200px|thumb|<b>Figure 3.</b> A 3D view of our PSF found by looking at the light recorded by the microscope by a single fluorescent 190 nm bead.]] | ||
+ | | [[File:PSF32012.gif|200px|thumb|<b>Figure 4.</b> An image stack of our PSF.]] | ||
+ | |- | ||
+ | | [[File:TheoreticalPSF3D2012.png|200px|thumb|<b>Figure 5.</b> A 3D view of a calculated theoretical PSF.]] | ||
+ | | [[File:TheoreticalPSF-3D2012.gif|200px|thumb|<b>Figure 6.</b> An image stack of a calculated theoretical PSF.]] | ||
+ | |} | ||
+ | <br style="clear: both" /> | ||
+ | == Code == | ||
+ | Leanna wrote the code, I defer to what she has said about it. |
Revision as of 22:26, 9 May 2012
Contents
Objectives
- Building a fluorescence microscope, tuning
- Learning how optical components like those from ThorLabs come together and work.
- Learning about stepper control in a lab setting
- Learning about 3-dimensional deconvolution and looking at the differences in image reconstruction for the actual and theoretical PSF.
Materials
Microscope
- Epi-fluorescence Microscope[1] with parts from Thorlabs
Drivers
- Pololu A4983 Stepper Motor Driver Carrier with Voltage Regulators[2]
- Thorlabs 8 mm Travel Stepper Motor Actuator[3]
Processing
- Matlab
- Matlab Image Acquisition Toolbox[4]
- Matlab Allied Vision Technologies Adaptor[5]
- National Instruments USB Data Acquisition[6]
- ImageJ[7]
- ImageJ plugins: Deconvolution Lab[8] and Diffraction PSF 3D[9]. Manually save in the plugins folder in ImageJ.
Subject
- Submicron beads, small enough to be considered point sources
Microscope
The microscope built was an epi-fluorescence microscope which used a green laser for fluorescence. The stage was designed to be controlled by microstepper motors such that the 3D PSF could be obtained through scanning the z-axis of a sample.
Safety
Since a moderately high-power laser was being used, safety precautions were taken:
- An ND filter was used during laser alignment and while the apparatus was being built
- When laser was turned on for actual measurements, the ND filter was removed and 532nm protective laser goggles were worn by all in the vicinity.
Laser Alignment
- The laser could be aligned using two 2-degrees tunable mirrors, allowing both angle and position of the beam to be controlled.
Data Acquisition
Actual PSF
Theoretical PSF
Results
Results
Code
Leanna wrote the code, I defer to what she has said about it.
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