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Examination of the two-dimensional pupil function in coherent scanning microscopes using spherical particles
The Journal of the Acoustical Society of America
|July 22, 1998
Summary
This study demonstrates using spherical particles to determine the pupil function modulus in acoustic and optical microscopy. Method accuracy depends on particle size and pupil edge sharpness for reliable results.
Area of Science:
- Microscopy techniques
- Wave optics
- Acoustic imaging
Background:
- Pupil function characterization is crucial for microscopy.
- Spherical particles offer a potential tool for pupil function determination.
- Previous methods may have limitations in accuracy and applicability.
Purpose of the Study:
- To demonstrate a method for determining the pupil function modulus using spherical particles.
- To analyze the influence of spherical particle size on accuracy.
- To evaluate the method's performance in confocal scanning optical and scanning acoustic microscopy.
Main Methods:
- Theoretical examination of spherical particle imaging in microscopy.
- Numerical simulations to analyze method accuracy.
- Experimental validation using confocal scanning optical microscope and scanning acoustic microscope.
Main Results:
- The method provides good results for smoothly varying pupil functions.
- Accurate pupil function determination with sharp-edged pupils requires imaging large spheres.
- Method accuracy is significantly dependent on the size of the spherical particle used.
Conclusions:
- Spherical particle imaging is a viable technique for pupil function modulus determination in reflection microscopy.
- The size of the spherical particle and pupil edge characteristics are critical factors for accuracy.
- The method is validated for both optical and acoustic scanning microscopy.