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groups:mg:notes [2017/03/28 13:37] – steffengroups:mg:notes [2018/03/16 12:33] (current) – [Clocks hight in respect to the geoid] fim
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 ===== Frequency-Comb Hannover ===== ===== Frequency-Comb Hannover =====
  
-^ Channel ^ Measured  ^ Frequency  ^ Sign ^Interval ^ Max outliers (Alarm) ^ F(x) ^ +^ Channel  ^ Measured                            ^ Frequency     ^ Sign  ^ Interval (axis)  ^ Max outliers (Alarmschwelle)      ^ F(x)     ^ 
-|CH1 | IQ-Resonator (R1) vs. Comb | 29.347 MHz | - | ±1 kHz | | -fx | +| CH1      | IQ-Resonator (R1) vs. Comb          | 29.347 MHz    | -     | ± 900 Hz         | 500 Hz                            | -fx      | 
-|CH2 | CEO  | 20 MHz | - | ±2 Hz | | -fceo | +| CH2      | CEO                                 | 20 MHz        | -     | ± 0.24 Hz        | 0.15 Hz                           | -fceo    | 
-|CH3 | Reprate  | 6.250001 MHz  | | ±0.002 Hz | | frep | +| CH3      | Reprate/16                          | 6.250001 MHz  |       | ± 0.0018 Hz      | 0.001 Hz                          | frep/16  | 
-|CH4 | Link vs. Comb  | 22.432 MHz  | - | ± 300 Hz | | -fy | +| CH4      | Link vs. Comb                       | 22.432 MHz    | -     | ± 900 Hz         | 500 Hz                            | -fy      | 
-|CH5 | Virtualer Beat (Link vs. IQ-Laser)  | 21,27143 MHz  | | ± 20 Hz | | fv | +| CH5      | Virtualer Beat (Link vs. IQ-Laser)  | 21,27173 MHz  |       | ± 18 Hz          | 10 Hz                             | fv       | 
-|CH6 | Manypoint-AOM  | 36 MHz  | | ±5 Hz | | | +| CH6      | Manypoint-AOM                       | 36 MHz        |       | ±18 Hz           | 10 Hz                             |          | 
-|CH7 | Stell-AOM vom IQ-Laser  | 35.02865 MHz  | | ±100 kHz | | f_Stell | +| CH7      | Stell-AOM vom IQ-Laser              | 35.0X MHz     |       | ± 4000 Hz        | 2000 Hz (+ correction of Offset)  | f_Stell  | 
-|CH8 | Rubidiumuhr referenziert auf GPS  | 10 MHz  | | ±0.002 Hz | | |+| CH8      | Rubidiumuhr referenziert auf GPS    | 10 MHz        |       | ± 0.0018 Hz      | 0.001 Hz                          |          |
  
-  * Modenverhältnis: 1944000/3275292+  * Modenverhältnis: Ratio: N=n916/nLink = 3275292/1944000 = 1.684820987654321… 
   * Repetitionsrate: 100,0000226 MHz   * Repetitionsrate: 100,0000226 MHz
  
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   * Channel 7 = 138 MHz (Synthesizer, referenced by 10 MHz GPS) - Double-pass AOM   * Channel 7 = 138 MHz (Synthesizer, referenced by 10 MHz GPS) - Double-pass AOM
  
-==== Virtuel-Beat ====+  * Atom frequency: nu_opt(Mg = ( 3275292*col(e)*16 - 2*col(d) - col(c) + 80,111e6)*2 + 77,111e6 
 +  * Laserfrequency: f_laser = 3275292*frep*16 - 2*fceo - fx 
 +  * Resonator 1 frequency: f_R1 = 3275292*frep*16 - 2*fceo - fx + (-2*f_AOM_R1) 
 +  * Double-pass AOM: f_AOM_R1 = 138 MHz - f_Stell
  
-  * fv = (fy + fceo) - (fx + 2*fceo) * (1944000/3275292) + (2*10 MHz)+==== Virtual-Beat ==== 
 + 
 +  * fv = (fy + fceo) - ( (fx + 2*fceo) / (3275292/1944000) ) + (2*10 MHz)
  
  
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   * nu_opt(Mg) - nu_(Mg2015)[Hz] = nu_opt(Mg) - 655058646691000   * nu_opt(Mg) - nu_(Mg2015)[Hz] = nu_opt(Mg) - 655058646691000
  
-  * Atom frequency: nu_opt(Mg = ( 3275292*col(e)*16 - 2*col(d) - col(c) + 80,111e6)*2 + 77,111e6 
-  * Laserfrequency: f_laser = 3275292*frep*16 - 2*fceo - fx 
-  * Resonator 1 frequency: f_R1 = 3275292*frep*16 - 2*fceo - fx + (-2*f_AOM_R1) 
-  * Double-pass AOM: f_AOM_R1 = 138 MHz - f_Stell 
  
 -> nu_opt(Mg) - nu_(Mg2015)[Hz] = ( f_laser + 80,111e6)*2 + 77,111e6 - 655058646691000\\ -> nu_opt(Mg) - nu_(Mg2015)[Hz] = ( f_laser + 80,111e6)*2 + 77,111e6 - 655058646691000\\
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 +
 +====== Clocks hight in respect to the geoid ======
 +
 +In front of the university are studs which are used as a reference. In the PDF everything is explained and is given by Dr. Heiner Denker (Institut für Erdvermessung (IFE)), he will also estimate the experiments height with higher precision soon.
 +{{ :groups:mg:img_0138.jpg?nolink&200|}}
 +{{ :groups:mg:afisbuchnachweis362400016.pdf |}}