105
edits
Changes
Jump to navigation
Jump to search
Line 71:
Line 71: − + − + + − + − + + + + + + +
Tagger microscope prototype construction (view source)
Revision as of 20:40, 13 May 2008
, 20:40, 13 May 2008→Transmission Testing
*'''Current Results'''
*'''Current Results'''
We tested the control fiber several times and each time we got a significantly different result. Below we see a histogram of the control fiber whose test length was about 48 hours and a graph comparing the different tests of the control fiber.
We tested the control fiber several times and each time we got a significantly different result. Below we see a histogram of the control fiber whose test length was about 48 hours and a graph comparing the different tests of the control fiber.
{| cellpadding="3" style="text-align:center; margin: 1em auto 1em auto"
{| cellpadding="3" style="text-align:center; margin: 1em auto 1em auto"
|-
|-
| [[Image:CtrlTrTests.png|right]] || || [[Image:CtrlPhotonDist.png|left]]
| [[Image:CtrlTrTests.png|right]] || || [[Image:CtrlPhotonDist.png|left]]
|-
|-
|}As you can see from the graph, there is a large discrepancy between the different tests of the same fiber. This could be caused by several things, such as
|}
As you can see from the graph, there is a large discrepancy between the different tests of the same fiber. This could be caused by several things, such as
**The fiber end pointing to the SiPM changes position to dramatically
**The fiber end pointing to the SiPM changes position to dramatically
**The fiber end facing the LED changes position significantly as to change the amount of photons able to transmit through the fiber.
**The fiber end facing the LED changes position significantly as to change the amount of photons able to transmit through the fiber.
**In changing the fiber, the SiPM could have been disturbed.
**In changing the fiber, the SiPM could have been disturbed.
*Solution to Problems
*'''Solution to Problems'''
We redesigned the "thermal finger" for holding the two different SiPMs. The designs are seen below. The purpose for this is so that the SiPMs can be changed out easily and that we can ensure that the device is in the same position every time. [[Image:ThermFinger.jpg|thumb|left]] [[Image:plug.jpg|thumb]]
We redesigned the "thermal finger" for holding the two different SiPMs. The designs are seen below. The purpose for this is so that the SiPMs can be changed out easily and that we can ensure that the device is in the same position every time.
{| cellpadding="3" style="text-align:center; margin: 1em auto 1em auto"
|-
|[[Image:ThermFinger.jpg|thumb|left]] || [[Image:plug.jpg|thumb]]
|-
|}
To ensure that that fiber is in the same position every time in the protochimney, we wrap the end of the fiber in electrical tape (even amounts on all sides). Once wrapped the fiber should fit snugly in the chimney thereby reducing the movement of the fiber. Addressing the remaining problem, we are still working on a proper solution.
== Gluing ==
== Gluing ==