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Cool!!! Melihat Isi Dalam Meteorit
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Cool!!! Melihat Isi Dalam Meteorit
Quote:
Meteorit
Meteorite adalah meteoroid, fragmen batuan dan/atau logam dari ruang angkasa yg berhasil menerobos atmosfir dan mendarat dipermukaan bumi.
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Meteorite adalah meteoroid, fragmen batuan dan/atau logam dari ruang angkasa yg berhasil menerobos atmosfir dan mendarat dipermukaan bumi.
[/spoiler]Irisan tipis meteorit :
Difoto menggunakan kamera polarisasi, dgn sistem filter sanwich
Dan juga dgn petrographic microscope, Pentax istDS DSLR kamera polarisasi silang
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Info menarik untuk agan2 jurusan teknik geologi
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Xpolar sandwich
Illustration of cross-polar thin section "macro" setup.
The two "rings" are linear polarizing camera filters (67mm dia.) from Hoya.
A meteorite thin section (petrographic slide) is between them, in the dark area. The dark area is created by rotating one of the polarizers 90 degrees relative to the other (angle is between their respective axes of polarization). The lighter area shows that light passes through either filter, but not through both -- except where the minerals in the thin section alter the index of refraction/polarization.
The outer mid-dark area is a "fill" made during editing, to hide the blinding light from the light source beneath the polarizers ...
Update: I was explaining this to a friend last weekend and it's clear I wasn't, well, clear. What's going on here is this sandwich of two polarizing filters with a thin section between them is sitting on a light table. So, light is coming up from beneath (at you in this photo), passing through a polarizer, then through a paper-thin section of rock from a meteorite, then through the top polarizer, and into the camera. The polarizers are blocking all the light from around the thin section (the trapezoidal shape with all the colors) except where they don't overlap (the two whitish crescent shapes). The outer gray area was white before I filled it with gray color using LView, a photo editor like Photoshop. I hope that clears things up a bit.
Update(2): To give you an idea of scale, the smallest note in the above image shows a compound chondrule that is 3mm long. The link in the note takes you to an animation of this chondrule in cross-polarized light using a petrographic microscope.
Lebih detail : T K P- Setiap gambar ada penjelasan mengenai asal meteorite, kamera yg digunakan, dan sistim polarisasi
Illustration of cross-polar thin section "macro" setup.
The two "rings" are linear polarizing camera filters (67mm dia.) from Hoya.
A meteorite thin section (petrographic slide) is between them, in the dark area. The dark area is created by rotating one of the polarizers 90 degrees relative to the other (angle is between their respective axes of polarization). The lighter area shows that light passes through either filter, but not through both -- except where the minerals in the thin section alter the index of refraction/polarization.
The outer mid-dark area is a "fill" made during editing, to hide the blinding light from the light source beneath the polarizers ...
Update: I was explaining this to a friend last weekend and it's clear I wasn't, well, clear. What's going on here is this sandwich of two polarizing filters with a thin section between them is sitting on a light table. So, light is coming up from beneath (at you in this photo), passing through a polarizer, then through a paper-thin section of rock from a meteorite, then through the top polarizer, and into the camera. The polarizers are blocking all the light from around the thin section (the trapezoidal shape with all the colors) except where they don't overlap (the two whitish crescent shapes). The outer gray area was white before I filled it with gray color using LView, a photo editor like Photoshop. I hope that clears things up a bit.
Update(2): To give you an idea of scale, the smallest note in the above image shows a compound chondrule that is 3mm long. The link in the note takes you to an animation of this chondrule in cross-polarized light using a petrographic microscope.
Lebih detail : T K P- Setiap gambar ada penjelasan mengenai asal meteorite, kamera yg digunakan, dan sistim polarisasi
Lebih detail : T K P - Setiap gambar ada penjelasan mengenai asal meteorite, kamera yg digunakan, dan sistim polarisasi
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