Difference between revisions of "Counting individual photons"

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== Meeting Notes ==
 
== Meeting Notes ==
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* [[January 30, 2007]]
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* [[May 21, 2008]]
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* [[February 15, 2007]]
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* [[May 13, 2008]]
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* [[March 1, 2007]]
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* [[May 6, 2008]]
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* [[March 28, 2007]]
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* [[April 29, 2008]]
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* [[April 5, 2007]]
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* [[April 22, 2008]]
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* [[April 19, 2007]]
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* [[April 17, 2008]]
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* [[April 1, 2008]]
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* [[March 11, 2008]]
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* [[February 28, 2008]]
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* [[February 14, 2008]]
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* [[January 31, 2008]]
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* [[January 25, 2008]]
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* [[January 17, 2008]]
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* [[ASR Meeting Notes 2007|Meetings from 2007]]
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== Research Project Pages ==
 
== Research Project Pages ==
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* [[My research paper]]
 
* [[My research paper]]
 
* [[Poster from Westport Science Fair]]
 
* [[Poster from Westport Science Fair]]
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* [http://zeus.phys.uconn.edu/~jonesrt/students/jzhao/suitability-4-2-2007.ppt Presentation to ASR peers on April 2, 2007]
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* [http://zeus.phys.uconn.edu/~jonesrt/students/jzhao/jie-5-2007.ppt Presentation at Science Symposium April 23, 2007]
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* [[Media:TemponDark.ppt|ASR first semester project presentation, 2007/8]]
 
* [[Method for determining how many photons are in a pulse]]
 
* [[Method for determining how many photons are in a pulse]]
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* [[My List of Research Articles on Photon Detection|My list of research articles on photon detection]]
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* [http://zeus.phys.uconn.edu/halld/siliconPM/ Directory of Papers on Silicon Photomultipliers in High Energy Physics Experiments]
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* [[Advantages of the SiPM]]
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* [[SiPM Used]]
  
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== Poster from Westport Science Fair ==
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* [[Prediction]]
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{|
 
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||[[Image:Poster_v1_(main).JPG|thumb|150px|main poster]] ||[[Image:Poster_v1_(center_top).JPG|thumb|150px|center top]] ||[[Image:Poster_v1_(center_bottom).JPG|thumb|150px|center_bottom]]
 
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|}
 
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== Measured pulse photon count ==
 
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[[Image:Pulses_Detected.JPG|thumb|150px|Data]]
 
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At the right is a snapshot of the pulses produced by a hybrid photodiode (HPD, blue trace) illuminated by a blue light-emitting diode (LED, yellow trace).  The average number of photons detected by the HPD per pulse is computed by taking the integral of the charge in a single pulse and dividing it by the average charge per photoelectron in the HPD.  The manufacturer (DEP, Netherlands) specifies that the HPD collects 2700 ''e''<sup>-</sup> of charge per photoelectron produced in the cathode.  The signal from the HPD was not amplified.  It was measured in Volts by the oscilloscope with a 50&Omega; terminating resistor.  The blue trace in the figure displays 20 mV per division, which becomes 0.40 mA / division after dividing by R=50&Omega;.  Visually integrating the red shaded area in the figure gives about 6.5 squares.  Each square is 0.40 mA * 250 ns = 100 * 10<sup>-12</sup>C.  The charge of each electron is 1.6 * 10<sup>-19</sup> C, so this integral is 600 million collected electrons.  Dividing by 2700 collected electrons per photoelectron gives 230,000 detected photons per pulse.
 
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:<math>\int\ {f(x)}\, dx \approx 230000\ photons</math>
 
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== Article(s) ==
 
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http://argus.phys.uregina.ca/gluex/DocDB/0007/000760/001/report-2-2007.pdf
 
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PPT of the article
 
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[[Powerpoint_Silicon-Photomultiplier]]
 

Latest revision as of 18:57, 21 May 2008

Meeting Notes


Research Project Pages

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