Numerical apertureof optical fiber

I have the small machine too and use the 10 mm x 50 mm size dominoes. I've done maybe a dozen tables this way with no problems to date.

I recently stretched a “floating” desk top in solid white oak using #8 domino cutter and the domino connector system. Worked pretty flawlessly. Kinda large investment though. I am very happy to have the connector set.

Numerical apertureformula

Whenever I ask myself a question like this, that little voice in the back of my head is always the one I listen to -- "Do it right, and make a new top."

We have created these special content collections organized to give you a deep dive into a range of topics that matter.

Have any of you tried a short b-board “haunch” backed up with floating tenons glued ino the ends of the long boards ala’ mega-dominoes?  In my mind I have a 1/2″ full width haunch with a 4″ floater fully glued in the middle and two 4″ floaters on each side of center, glued into the ends but pinned to the breadboard.  The floaters would go 2″ either way with 4″ wide b-boards. For a 47″ total

numericalaperture中文

The image formed by a perfect, aberration-free objective lens at the intermediate image plane of a microscope is a diffraction pattern with a very specific intensity distribution. This tutorial explores the effects of the objective´s numerical aperture (NA) on the diffraction pattern and the resolution of a microscope. The three-dimensional representation of the diffraction pattern is the Point-Spread-Function (PSF) which, in a coma- and/or astigmatism-free system, is symmetrically periodic both along the optical axis, and radially across the image plane. This diffraction pattern can be sectioned in the focal plane to produce a two-dimensional diffraction pattern, having a bright circular disk surrounded by an alternating series of bright and dark higher-order diffraction rings whose intensity decreases with distance from the central disk, the so-called Airy disk. Under visual microscopical observation, only two or three of the circular luminous rings are usually visible in the intermediate image plane.

Fine Woodworking receives a commission for items purchased through links on this site, including Amazon Associates and other affiliate advertising programs.

Numerical Aperturecalculator

Numerical aperture

θ is the objective’s angular aperture and n is the refractive index of the medium (air, water, or oil) between the objective and the specimen.

Pants; Sadly I cannot decline.. my build, my table... change of mind on size from the boss (tabletop stock already rough milled too short). The haunch I mentioned was essentially a stopped T&G to clean up the look on the end. Had not thought of screws, was gonna draw pin it but that could clean up the top surface, thanks.

The tutorial starts with a pattern of Airy disks appearing in the focal plane of the microscope and the point-spread function / three dimensional of a corresponding, single Airy disk pattern shown on the right. To operate the tutorial, use the Numerical Aperture slider to change the objective´s numerical aperture and the resolution of the Airy patterns. The left position of the slider shows the pattern at the lowest objective numerical aperture (= 0.20), and the right position illustrates the highest degree of resolution (numerical aperture = 1.30). As the slider is moved from left to right, the objective’s numerical aperture increases and the complex Airy pattern, as visible in the image, results in a progressively increased resolution of image detail. Correspondingly, the central peak and higher-order diffraction rings in the three-dimensional Airy pattern drawing grow smaller in diameter.

The resolving power of an objective determines the size of the formed Airy diffraction pattern: The radius of the central disk is determined by the combined numerical apertures of the objective and condenser. When condenser and objective have equivalent numerical apertures or the objective acts also as the condenser like in an inverted fluorescence microscope, the Airy pattern radius from the central peak to the first minimum is given by the equation:

Numerical apertureof lens

I guess you could add 3 inches to each end using Domino's. I wouldn't use the small one though, as they aren't very long. The way people tend to lean on table ends with both elbows, though, really gives me pause.

Please note that in some cases, you may be prompted to enter your login credentials again to access certain areas or resources within our training platform.

Hi all,  I have been asked to add length to a 5/4, 3-board maple table 30″x 40″ as it sits now.  Target is 46-48″.  I’m thinking breadboards, but anything I cut into tenons has to be added to the width of the breadboards, a cycle I think is a loser.

Become an UNLIMITED member and get it all: searchable online archive of every issue, how-to videos, Complete Illustrated Guide to Woodworking digital series, print magazine, e-newsletter, and more.

Join the ranks of world-leading microscopists with our expert training courses. Whether you're in academia or industry, a biologist, materials scientist, or somewhere in between, our training courses will help you unlock the full potential of your microscopy skills.

+1 on the dominoes just the same as stevieray said, made many that way, I would add make mortises as deep as possible just to make the alignment as close as possible and I usually glue the Center dominoes as well as about 6” of the edge of the breadboard to the end of the tabletop. I usually use 12mm for this but any will work just use more if they are skinny

Resolution is clearly influenced by the objective’s numerical aperture. Note that lower values of D indicate higher resolution. In the tutorial, the Numerical Aperture slider is used to control how the image structure evolves as the objective’s numerical aperture is increased. At the lowest numerical aperture value (0.20), the image details visible in the microscope are poorly defined and surrounded by diffraction fringes. As the slider is moved to higher numerical aperture values (0.50-0.80), the structural outline of the image becomes sharper and higher-order diffraction rings begin to emerge. At the highest numerical apertures (1.00-1.30), the diffraction disks are resolved individually as discrete luminous points surrounded by alternating series of bright and dark higher-order diffraction rings of decreasing intensity.

All the slots on the table top get glue, but only the center two on the breadboard. The other slots on the breadboard are dry, so the wood can move.

Numerical apertureunit

I cut slots in the main table every three inches or so, and match them with slots in the breadboard. I make the breadboard slots wider to allow for movement, except for the center two, which are normal size.

Numerical aperturemicroscope

Get instant access to over 100 digital plans available only to UNLIMITED members. Start your 14-day FREE trial - and get building!

r(Airy) is the Airy radius, λ is the wavelength of the illuminating light, and NA(Obj) is the objective´s numerical aperture (objective aperture = condenser aperture). The numerical aperture depends on the aperture angle of the illumination entering the objective aperture, as well as the refractive index of the imaging medium:

Thanks All! I think my original plan of large floating tenons has been validated so I'll stick with it; along with a T&G to ensure alignment and a clean look. The voice in my head says the largest domino in the systainer does not feel right.

This foundational knowledge article explores the effects of the numerical aperture (NA) of an objective lens on the resolution of images produced by a microscope. It explains the diffraction pattern produced by an objective lens and how increasing the NA results in higher resolution images. The tutorial demonstrates the changes in image structure as the NA is adjusted.

You could, I guess, you can also decline. This is an existing table and some risk involved that falls on you if it doesn't work out. But.. I would option for the 46 " version since that is presented as an option. I don't see that your "domino" version is significantly different functionality than if the tenons were part of the boards . If it were my project I would feel better if there was a tongue and groove the whole length even if it was a small one, 5/16" 3/8". Mortise the table and the end pieces then cut ( rout) a tongue onto the end of the table and a matching groove into the end boards. I would think that the tenons could be thicker than the t&g if you wish. I would glue the center tenon both ends and the others I would glue into the table side only . I would make the tenon on the sides slightly narrower than the mortise on the breadboard end I wouldnt think that you would need as much as 1/4" expansion each side. That is, full size and glued on the table and cut narrower and unglued for the breadboard. I would then set a screw from the bottom through a slotted hole in the tenon to keep things in place. If this is for pay be sure to stress to the client that this is a PIA so that you can charge accordingly!

Our biweekly podcast allows editors, authors, and special guests to answer your woodworking questions and connect with the online woodworking community.

Adding the large tenons is the same to me as if I milled stock away to make them. I'll epoxy them in to keep the moisture out. Wish me luck!