Laser Images - Revision history

Ploen: /* Light Loss Along Length */

2016-01-29T03:31:37Z

Light Loss Along Length

Ploen: /* Damage from Clamp */

2016-01-29T03:30:06Z

Damage from Clamp

Ploen: /* Damage from Clamp */

2016-01-29T03:29:37Z

Damage from Clamp

Ploen: /* Other Surface Imperfections */

2016-01-29T03:29:10Z

Other Surface Imperfections

Ploen: /* Damage from Clamp */

2016-01-29T03:14:39Z

Damage from Clamp

Ploen: /* Damage from Clamp */

2016-01-29T02:33:15Z

Damage from Clamp

Ploen: /* Surface Imperfections */

2016-01-28T23:23:34Z

Surface Imperfections

Ploen: /* Used Fibers */

2016-01-28T23:20:22Z

Used Fibers

Ploen: /* New Fibers */

2016-01-28T23:16:55Z

New Fibers

Ploen: /* New Fibers */

2015-12-28T06:35:22Z

New Fibers

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 ==Light Loss Along Length==
-I took the segments of wave guide that I had examined under microscope and exposed them to a green laser pointer with very little ambient light.  The laser illuminated the wave guide and revealed the effects of surface damage.  Areas with fissures, dust, or residue sparkled under the green light.  This indicates significant light loss.  Understanding light loss is key to the success of the tagger microscope.
+I took the segments of wave guide that I had examined under microscope and exposed them to a green laser pointer in a dark room.  The laser illuminated the wave guide and revealed the effects of surface damage.  Areas with fissures, dust, or residue sparkled under the green light.  This indicates significant light loss.  Understanding light loss is key to the success of the tagger microscope.
 [[ File:Cropped Used WG Loss LengthwiseDSC 0169.JPG |thumb|center|Figure 1: The effect of many surface imperfections becomes obvious when looking at a length of illuminated light guide. (Previously processed light guide. MFR: Saint Gobain BCF-98)]]

@@ Line 48: / Line 48: @@
 In Figure 7, I shined a laser through the new light guide and used a paper bowl to block ambient light from the laser.  To the left of the bowl, one sees bright spots on an otherwise dimly lit fiber.  This corresponds to the position of the clamp.
-Examining Figure 8 reveals several marks along the right half of the fiber.  The leftmost striation is most well-defined, and beyond that the fiber does not spill light.  I hypothesize that the clip may have been re-positioned, leaving other scratches, but the leftmost band was the farthest down the fiber that the clip was placed. Some of the poorly defined light loss from the right might simply be due to the position of the laser.
+Examining Figure 8 reveals several marks along the right half of the fiber.  The leftmost striation is the most well-defined, and beyond that the fiber does not spill light.  I hypothesize that the clip may have been re-positioned, leaving other scratches, but the leftmost band was the farthest down the fiber that the clip was placed. Some of the poorly defined light loss from the right might simply be due to the position of the laser.
 Figure 9 offers an alternate view with less ambient light.

@@ Line 36: / Line 36: @@
 ==Damage from Clamp==
-The pictures below all reveal a band of damage near the clamped end of the spooled light guide.  The damage goes all the way around the fiber and is only found at this point.  I used extreme care when cutting the fiber and transporting them, and I do not believe these marks are from me.  The implication of these images is important: if a weak foam-lined clamp (chip-clip style) can cause this damage, then one must wonder about other potential mishandling.  I have observed hook-and-loop ties used to store fiber bundles, fibers laid across tables, fibers laid over sandpaper (quickly moved when pointed out), and fibers rubbing against other fibers.  all of these scenarios are equally or more abrasive than the chip clip.  I hypothesize that the materials coming into direct contact with the fibers are leaving the most damage,  but that many, if not all, procedures for manipulating fibers are leaving marks.  Pictures of the chip-clip and the hook-and-loop fasteners to come.
+The pictures below all reveal a band of damage near the clamped end of the spooled light guide.  The damage goes all the way around the fiber and is only found at this point.  I used extreme care when cutting the fiber and transporting it, and I do not believe these marks are from me.  The implication of these images is important: if a weak foam-lined clamp (chip-clip style) can cause this damage, then one must wonder about other potential mishandling.  I have observed hook-and-loop ties used to store fiber bundles, fibers laid across tables, fibers laid over sandpaper (quickly moved when pointed out), and fibers rubbing against other fibers.  all of these scenarios are equally or more abrasive than the chip clip.  I hypothesize that the materials coming into direct contact with the fibers are leaving the most damage,  but that many, if not all, procedures for manipulating fibers are leaving marks.  Pictures of the chip-clip and the hook-and-loop fasteners to come.
 <gallery>

@@ Line 55: / Line 55: @@
 ==Other Surface Imperfections==
 <gallery>
 File:Bright surface imperfections Cropped DSC 0030.JPG|Figure 10: Minimal surface imperfections visible near end of new light guide.
@@ Line 60: / Line 67: @@
 File:Cropped lower light edge imperfections DSC 0054.JPG|Figure 11:‎ Imperfections along edge in new light guide.
 </gallery>

@@ Line 36: / Line 36: @@
 ==Damage from Clamp==
-The pictures below all reveal a band of damage near the clamped end of the spooled light guide.  This discovery is important: if a weak foam-lined clamp (chip-clip style) can cause this damage, then one must wonder about other potential mishandling.  I have observed hook-and-loop ties used to store fiber bundles, fibers laid across tables, fibers laid over sandpaper (quickly moved when pointed out), and fibers rubbing against other fibers.  I hypothesize that the sharp edges of the square guides are most prone to damage, but that all procedures for manipulating fibers are leaving marks.  Pictures of the chip-clip and the hook-and-loop fasteners to come.
+The pictures below all reveal a band of damage near the clamped end of the spooled light guide.  The damage goes all the way around the fiber and is only found at this point.  I used extreme care when cutting the fiber and transporting them, and I do not believe these marks are from me.  The implication of these images is important: if a weak foam-lined clamp (chip-clip style) can cause this damage, then one must wonder about other potential mishandling.  I have observed hook-and-loop ties used to store fiber bundles, fibers laid across tables, fibers laid over sandpaper (quickly moved when pointed out), and fibers rubbing against other fibers.  all of these scenarios are equally or more abrasive than the chip clip.  I hypothesize that the materials coming into direct contact with the fibers are leaving the most damage,  but that many, if not all, procedures for manipulating fibers are leaving marks.  Pictures of the chip-clip and the hook-and-loop fasteners to come.
 <gallery>
-File: Fast Shutter Clamp Damage DSC 0368.JPG|Figure 7
+File: Fast Shutter Clamp Damage DSC 0368.JPG|Figure 7 Damage to new light guide appears as a band around the end that was clamped during storage.
-File:Cropped DSC 0059.JPG|Figure 8
+File:Cropped DSC 0059.JPG|Figure 8 Close up of damage near clamping site.
-File:Cropped detail clamp damage DSC 0061.JPG|Figure 9
+File:Cropped detail clamp damage DSC 0061.JPG|Figure 9 Lower intensity laser allows the most severe scratches to be highlighted.
 </gallery>
 ==Other Surface Imperfections==

← Older revision		Revision as of 02:33, 29 January 2016
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	==Damage from Clamp==		==Damage from Clamp==
		+
		+	The pictures below all reveal a band of damage near the clamped end of the spooled light guide. This discovery is important: if a weak foam-lined clamp (chip-clip style) can cause this damage, then one must wonder about other potential mishandling. I have observed hook-and-loop ties used to store fiber bundles, fibers laid across tables, fibers laid over sandpaper (quickly moved when pointed out), and fibers rubbing against other fibers. I hypothesize that the sharp edges of the square guides are most prone to damage, but that all procedures for manipulating fibers are leaving marks. Pictures of the chip-clip and the hook-and-loop fasteners to come.

	<gallery>		<gallery>

@@ Line 9: / Line 9: @@
 Details of the damage are visible in these pictures.
 <gallery>
@@ Line 19: / Line 15: @@
 File:Cropped Used surface imperfect 2 DSC 0201.JPG |Figure 3: Surface imperfections in previously processed light guide.
 </gallery>
 =New Fibers=

@@ Line 11: / Line 11: @@
 Figure 2: In the upper right-hand third of the image are two parallel bands outlining a section of wave guide that seems brighter.  This corresponds to the glue residue from the sticky labeling system. Other damage can also be seen.
 Figure 3: Nicks, gouges, and residues coat the length of the fiber, causing light loss everywhere.
 =New Fibers=

@@ Line 24: / Line 24: @@
 ==Clarity==
 Freshly cut light guide demonstrates remarkable clarity and minimal light loss.  These images illustrate the smoothness of an undamaged surface.
-[[File:Open Shutter LG End DSC 0020.JPG|thumb|Figure 5: Polished end of light guide away from light source, recently cut from spool. Long exposure reveals minimal light loss relative to end. (MFR Saint Gobain BCF-98)]]
+File:Open Shutter LG End DSC 0020.JPG|Figure 5: Polished end of light guide away from light source, recently cut from spool. Long exposure reveals minimal light loss relative to end.
-[[File:Bright Clear Nearly Perfect DSC 0019.JPG|thumb|left|Figure 6: Top view of light guide recently cut from spool. Uniform brightness indicates few surface abnormalities. (MFR Saint Gobain BCF-98)]]
+File:Bright Clear Nearly Perfect DSC 0019.JPG|Figure 6: Top view of light guide recently cut from spool. Uniform brightness indicates few surface abnormalities.
-==Damage from Clamp==
+File:Cropped detail clamp damage DSC 0061.JPG|Figure 9
-[[File: Fast Shutter Clamp Damage DSC 0368.JPG|thumb|Figure 7]]
+</gallery>
 ==Other Surface Imperfections==
-[[File:Bright surface imperfections Cropped DSC 0030.JPG|thumb|left| Figure 10: Minimal surface imperfections visible near end of new light guide.]]
+File:Cropped lower light edge imperfections DSC 0054.JPG|Figure 11:‎ Imperfections along edge in new light guide.
-[[ File:Cropped 2 surface some loss DSC 0056.JPG|thumb|left|Figure 12:‎ Two sides of the wave guide are visible and minimal light loss is observed. Bright region due to laser angle.]]
+File:Cropped 2 surface some loss DSC 0056.JPG|Figure 12:‎ Two sides of the wave guide are visible and minimal light loss is observed. Bright region due to laser angle.

@@ Line 29: / Line 29: @@
 [[File:Open Shutter LG End DSC 0020.JPG|thumb|Figure 5: Polished end of light guide away from light source, recently cut from spool. Long exposure reveals minimal light loss relative to end. (MFR Saint Gobain BCF-98)]]
-[[File:Bright Clear Nearly Perfect DSC 0019.JPG|thumb|center|Figure 6: Top view of light guide recently cut from spool. Uniform brightness indicates few surface abnormalities. (MFR Saint Gobain BCF-98)]]
+[[File:Bright Clear Nearly Perfect DSC 0019.JPG|thumb|left|Figure 6: Top view of light guide recently cut from spool. Uniform brightness indicates few surface abnormalities. (MFR Saint Gobain BCF-98)]]
@@ Line 36: / Line 36: @@
 ==Damage from Clamp==
-[[File: Fast Shutter Clamp Damage DSC 0368.JPG|thumb|left|Figure 7]]
+[[File: Fast Shutter Clamp Damage DSC 0368.JPG|thumb|Figure 7]]
-[[File:Cropped DSC 0059.JPG|thumb|Figure 9]]
+[[File:Cropped DSC 0059.JPG|thumb|left|Figure 8]]
-[[File:Cropped detail clamp damage DSC 0061.JPG|thumb|center| Figure 8]]
+[[File:Cropped detail clamp damage DSC 0061.JPG|thumb| Figure 9]]
 ==Other Surface Imperfections==
-[[File:Bright surface imperfections Cropped DSC 0030.JPG|thumb|right| Figure 9: Minimal surface imperfections visible near end of new light guide.]]
+[[File:Bright surface imperfections Cropped DSC 0030.JPG|thumb|left| Figure 10: Minimal surface imperfections visible near end of new light guide.]]
 [[ File:Cropped lower light edge imperfections DSC 0054.JPG|thumb|Figure 11:‎ Imperfections along edge in new light guide.]]
-[[ File:Cropped 2 surface some loss DSC 0056.JPG|thumb|center|Figure 10:‎ Two sides of the wave guide are visible and minimal light loss is observed. Bright region due to laser angle.]]
+[[ File:Cropped 2 surface some loss DSC 0056.JPG|thumb|left|Figure 12:‎ Two sides of the wave guide are visible and minimal light loss is observed. Bright region due to laser angle.]]