Differences between revisions 10 and 19 (spanning 9 versions)

POX

The data for the following measurements is located at [https://nodus.ligo.caltech.edu:30889/svn/trunk/docs/upgrade08/RFsystem/RFphotodiodes/POX/ /svn/trunk/docs/upgrade08/RFsystem/RFphotodiodes/POX/]

RF Transimpedance

attachment:transimpedance.png

The above fit was done in LISO in root mode. The results of the fit were the following:

factor = (-2.1 +- 0.2) Ohms

delay = (9.57 +- 0.02) ns

five poles:

frequency (MHz)	Q
11.133 +- 0.003	14.3 +- 0.1
11.45 +- 0.06	0.595 +- 0.005
25.46 +- 0.02	5.89 +- 0.07
224.33 +-0.02	124 +- 4
100.7 +- 0.9	706.82 +- 0.04

four zeros:

frequency (MHz)	Q
22.67 +- 0.01	35 +- 1
55.4 +- 0.3	(10.0 +- 0.2) x 10⁶
0.93 +- 0.04	3.9 +- 0.6

Fits To Resonance

More detailed transfer functions were measured around the resonance peaks at 11, 22, and 55 MHz. These transfer functions were fit to attachment:resfitfunc.png where f₀ is the resonant frequency and Gamma is the line width. Q is calculated by f₀/Gamma.

11 MHz Resonance

attachment:res1.png

f₀ = (11.14 +- 0.01) MHz

Gamma = (764 +- 1) kHz

R₀ = (8.38 +- 0.01) x 10⁸ Hz Ohms

C = (11.14 +- 0.05) Ohms

chi^2/ndf = 95.4

22 MHz Resonance

attachment:res2.png

f₀ = (22.68 +- 0.01) MHz

Gamma = (820 +- 1) kHz

R₀ = (-5.64 +- 0.01) x 10⁶ Hz Ohms

C = (23.44 +- 0.01) Ohms

chi^2/ndf = 12.7

55 MHz Resonance

attachment:res3.png

f₀ = (55.29 +- 0.01) MHz

Gamma = (1.74 +- 0.01) MHz

R₀ = (-9.98 +- 0.01) x 10⁵ Hz Ohms

C = (1.62 +- 0.01) Ohms

chi^2/ndf = 3.22

Noise

attachment:noise.png

The noise data was fit to attachment:fitfunc.png with the following results:

Z_RF = (2.07 +- 0.01) kOhms

I_d = (247 +- 6) uA

chi² / ndf = 42

Note that this value for the transimpedance agrees with the above transfer functions since the noise was measured at 11 MHz instead of the resonance frequency of 11.14 MHz.

RF Behavior with No Light

attachment:timeseries.png

attachment:dark_spectrum.png

Picture of Photodiode

attachment:POX.jpg

Picture taken on 12/13/2010.

-  ⇤ ← Revision 10 as of 2011-01-19 10:48:58 → 
  Size: 884
  Editor: JenneDriggers
  Comment:
+   ← Revision 19 as of 2011-01-20 09:38:51 → ⇥
  Size: 2341
  Editor: JenneDriggers
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 9:
-Transimpedance at 11 MHz: 6.3 kOhms.
+The above fit was done in LISO in root mode. The results of the fit were the following:

factor = (-2.1 +- 0.2) Ohms

delay = (9.57 +- 0.02) ns

five poles:
|| frequency (MHz) || Q ||
|| 11.133 +- 0.003 || 14.3 +- 0.1 ||
|| 11.45 +- 0.06 || 0.595 +- 0.005 ||
|| 25.46 +- 0.02 || 5.89 +- 0.07 ||
|| 224.33 +-0.02 || 124 +- 4 ||
|| 100.7 +- 0.9 || 706.82 +- 0.04 ||

four zeros:
|| frequency (MHz) || Q ||
|| 22.67 +- 0.01 || 35 +- 1 ||
|| 55.4 +- 0.3 || (10.0 +- 0.2) x 10^6^ ||
|| 0.93 +- 0.04 || 3.9 +- 0.6 ||
-Line 12:
+Line 30:
+More detailed transfer functions were measured around the resonance peaks at 11, 22, and 55 MHz. These transfer functions were fit to attachment:resfitfunc.png where ''f'',,0,, is the resonant frequency and ''Gamma'' is the line width. ''Q'' is calculated by ''f'',,0,,/''Gamma''.
-Line 17:
+Line 37:
+''f'',,0,, = (11.14 +- 0.01) MHz

''Gamma'' = (764 +- 1) kHz

''R'',,0,, = (8.38 +- 0.01) x 10^8^ Hz Ohms

''C'' = (11.14 +- 0.05) Ohms

chi^2/ndf = 95.4
-Line 21:
+Line 51:
+''f'',,0,, = (22.68 +- 0.01) MHz

''Gamma'' = (820 +- 1) kHz

''R'',,0,, = (-5.64 +- 0.01) x 10^6^ Hz Ohms

''C'' = (23.44 +- 0.01) Ohms

chi^2/ndf = 12.7
-Line 24:
+Line 64:
+''f'',,0,, = (55.29 +- 0.01) MHz

''Gamma'' = (1.74 +- 0.01) MHz

''R'',,0,, = (-9.98 +- 0.01) x 10^5^ Hz Ohms

''C'' = (1.62 +- 0.01) Ohms

chi^2/ndf = 3.22
-Line 31:
+Line 81:
-Z,,RF,, = (2.07 +- 0.01) kOhms
+''Z'',,RF,, = (2.07 +- 0.01) kOhms
-Line 33:
+Line 83:
-I,,d,, = (24.7 +- 0.6) mA
+''I'',,d,, = (247 +- 6) uA
-Line 36:
+Line 86:
+Note that this value for the transimpedance agrees with the above transfer functions since the noise was measured at 11 MHz instead of the resonance frequency of 11.14 MHz.