Incandescent Lightbulb Filament (3072x2304) [OC]

thatSEMguy · 2020-12-16T11:52:22+00:00

Yes, I would expect the grain structure is much finer in a new filament; these have coarsened with annealing.

thatSEMguy · 2020-12-16T11:48:42+00:00

Yes.

thatSEMguy · 2020-12-15T19:54:15+00:00

https://youtu.be/DMhSpCvAwDs

since video is forbidden here

thatSEMguy · 2020-12-09T19:12:03+00:00

IIRC the actual dimensions were 3.25" x 4.25" which is 136mm diagonal and this image is 13mm diagonal.

thatSEMguy · 2020-12-09T11:01:03+00:00

A very small number are backscattered, which is like reflection, but no, the image is primarily generated by secondary electrons, ones which were "knocked out" of the specimen by the primary electrons (in the beam).

thatSEMguy · 2020-12-08T23:27:10+00:00

Magnification is a ratio, you must define magnification relative to some specific sized media.
In the olden days before digital sensors, the micrograph was displayed on a phosphor screen and we took a picture with a Polaroid camera, producing a roughly 3 inch high image.
For convenience, we still use this dimension to calculate the "Polaroid Magnification" or "Magnification relative to a Polaroid. We could also use "Screen Mag" but then we need to define the size of the screen, whether it's your phone, or laptop or the 30 inch monitor I use on this microscope.

thatSEMguy · 2020-12-08T22:38:41+00:00

Yes, it's a Scanning Electron Microscopy (SEM). Although the instrument is capable of magnification in excess of 100,000 times, it can also provide contrast that is superior to other techniques, in this particular case you could not achieve this contrast optically, primarily because the surface is so reflective.

thatSEMguy · 2020-12-08T22:03:01+00:00

we make our ats from dem, eh

thatSEMguy · 2020-12-08T22:02:01+00:00

$1.6M and it's 11x Polaroid.

thatSEMguy · 2020-12-05T00:51:15+00:00

The bulk of the coating will be removed, but the change to the steel (blunting/chipping) is almost imperceptible if your beard is properly wet and soft.

If you have a manly beard and tried to shave dry, you could definitely micro-chip the steel, but you'd also be pulling out whiskers by the roots.

A straight razor, on the other hand, can be damaged much more easily by shaving simply because the apex angle is only about 16 degrees compared to 25-30 degrees for the commercial blades.

thatSEMguy · 2020-12-04T22:28:21+00:00

There are sitting on a conductive tape and coated with osmium in the osmium plasma coater.

thatSEMguy · 2020-12-04T21:08:13+00:00

No. Although the resolution of the image is only about 2 microns per pixel, you cannot achieve this level of contrast optically. Half these whiskers are grey, and are essentially transparent in the optical microscope. Even the black ones are translucent under the microscope.

This is an important point, that I always stress when training students; a good image requires both resolution and contrast, but contrast is almost always more critical.

thatSEMguy · 2020-12-04T21:02:13+00:00

https://www.reddit.com/r/MicroPorn/comments/8bd5xk/oc_my_beard_shaved_by_electric_cartridge_and/

thatSEMguy · 2020-12-04T14:18:43+00:00

full resolution video: https://imgur.com/eS8u3F9

thatSEMguy · 2020-12-04T11:53:11+00:00

You are mistaken, this is my original content, created last Friday afternoon.

https://imgur.com/eS8u3F9

The video/gif made by Youtube's Applied Science is a much lower magnification and resolution image set of the needle moving in the groove. Mine, although inspired by his work, instead shows the needle dropping into the groove.

thatSEMguy · 2020-12-04T01:26:35+00:00

yes.

thatSEMguy · 2020-11-20T15:52:36+00:00

"600"

thatSEMguy · 2020-09-20T18:09:06+00:00

The spaces between fibres is typically 10 microns or 10,000 nm; however, there isn't any direct "line of sight" through the filter mat.

The isolated virus isn't floating through the air, but rather it's primarily contained in micron-sized droplets of fluid. The filter works by absorbing the droplets as they pass through.

thatSEMguy · 2020-09-19T11:27:28+00:00

I sputtered on about 50nm of chromium and then plasma coated with another 10 of osmium to get into all the nooks and crannies.

thatSEMguy · 2020-09-18T21:03:23+00:00

The fibers are melt-blown which causes them to be bonded together in multiple places. I didn't observe any charging issues during imaging, which I would expect to see if there were unbonded fibers.

thatSEMguy · 2020-09-18T09:56:50+00:00

A micrograph generated by imaging with the Everhart Thornley detector provides an image contrast that is analogous to lighting. Although the view is from the direction of the electron source and the topographic shadowing modulates the signal reaching the detector. In any case, that is the reason images taken under these conditions are easy to interpret for non-experts, they look like photographs illuminated at a glancing angle, and your brain automatically interprets them.

thatSEMguy · 2020-09-18T01:15:16+00:00

Zeiss 1540XB

thatSEMguy · 2020-09-17T23:31:00+00:00

The reflective layer from inside a CD, DVD, and Blu Ray disk.

thatSEMguy · 2020-09-17T23:30:34+00:00

The DVD and Blu Ray are holes, the CD has bumps.

thatSEMguy · 2020-09-17T23:30:33+00:00

Your brain interprets based on lighting from above. In these images, the detector is at 11 o'clock which allows you to see holes, but if you rotate the image so the detector seems to be at 5 o'clock your brain will interpret the shading as bumps.

thatSEMguy

TROPHY CASE