Use of fiber acceptance/exit angles in microscope illumination

Here you can discuss different microscopic techniques and illumination methods, such as Brightfield, Darkfield, Phase Contrast, DIC, Oblique illumination, etc.
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MichaelG.
Posts: 3978
Joined: Mon Apr 10, 2017 8:24 am
Location: North Wales

Re: Use of fiber acceptance/exit angles in microscope illumination

#2 Post by MichaelG. » Thu Aug 05, 2021 9:20 pm

A very interesting ‘invention’ with, I think, great potential for amateur experimentation.

The description of the perceived problem with conventional illumination is important:
The microscopes used for scientific purposes generally possess an illumination device which transmits the light from a light source via a condensor onto the object which is to be observed. During the course of the development of microscopes it has been found that the condensor is responsible for a great many image errors. Therefore, attempts have of course been made to continually improve upon the condensors and it has actually been possible to overcome numerous disturbing effects. Yet, no condensor which has been developed up to the present time can avoid diffraction effects of object structures from becoming visible at the image plane and which are not focused at the image plane. These diffraction patterns are superimposed upon the image of the phase object and render interpretation of the image more difficult.
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and the proposed solution is ingenious:
The method aspects of this development contemplate illuminating the object obliquely with regard to the object plane at one side of the object and observing such in the transmitted light. According to the invention, in order to illuminate the object there is employed mutually incoherent beams or bundles of light rays having axes which are essentially parallel to one an other. The invention is based upon the recognition that the influence of the disturbing diffraction effects at the microscope image are markedly suppressed with increasing incoherence of the light illuminating the object.
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MichaelG.
Too many 'projects'

MichaelG.
Posts: 3978
Joined: Mon Apr 10, 2017 8:24 am
Location: North Wales

Re: Use of fiber acceptance/exit angles in microscope illumination

#3 Post by MichaelG. » Fri Aug 06, 2021 5:29 pm

Just received an eMail from SurplusShed with this offer: https://www.surplusshed.com/pages/item/M2021.html

Bausch & Lomb enthusiasts, and fiber-optic experimenters, may be interested.

MichaelG.
Too many 'projects'

BramHuntingNematodes
Posts: 1538
Joined: Tue Jan 21, 2020 1:29 am
Location: Georgia, USA

Re: Use of fiber acceptance/exit angles in microscope illumination

#4 Post by BramHuntingNematodes » Fri Aug 06, 2021 6:20 pm

I got the old B&L dual gooseneck light works great very nice sheathing
1942 Bausch and Lomb Series T Dynoptic, Custom Illumination

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