DECIGO%20pathfinder?%20?????????????

1
DECIGO pathfinder??????????????

• ????????????????4?
• ?????

????,???,????,????,????A,????B,????C???,???A,????
?B,???C
2
??

• 1.?????????
• 2.????
• 3.????
• 4.???

3
??

• 1.?????????
• 2.????
• 3.????
• 4.???

4
??

• DECIGO pathfinder?? ??????????DECIGO????? ?????(
  FP???) ????????(?????)???

Fabry-Perot????????????? ??????????????????????
Fabry-Perot????????????? ??????????????????????
???????????????????????????? ?????
5
??????

• ?????? ???????????? ????????
• ??????? ?????????????,??
  ????????,??????? ??
• ???????????

• ?????(?,?????)????
• ??????????(???,???????)
• ?????????????? etc

GRACEs data (NASA)
6
??????????????
CHAMP(GFZ ???)2000?7?????
GRACE (NASA) 2002?3?????
GOCE(ESA)2009?3?????
GPS????????,?????????????????????????
2?????(220km??)??????????????????
???????????????????????????
7
??
??????????? UdU
??
???????????????,???????????????? U
GPS???
???????????????,??????UT????
?????h?????,??????U?,?????vm????.
??????????UdU???,???vmu????!
??h
?????N??????????dU???
????????
????????
????????
8
??2
??????????????????,??????
??
??????? ????
?????????? ? ??????
??????? ????
GPS?????????? vmu dv (??) (??)
????????????????? dv (??)
?????????vmu
9
??

• DPF?????????????????????????????

1mm???????????????????
????????110-6m/s???
cf.) GPS, SLR(Satellite Laser Ranging)????????1mm
10s?1?GPS????????????????,
GPS??????????????0.14mm/s(????????)
10
??

• 1.?????????
• 2.????
• 3.????
• 4.???

11
????

• ???? FITAL???????????????? FRL15DCWD??? ??155
  0nm ???? 40 mW
• ?????????????????inline???????????????????,pe
  rpendicular?????????????.

outp
out i
???
12
????2
????????
outi
130mm
35mm
???
In
outp
BS
??
ref
13
????3
?????????
mirror
BS
ref
In(????)
30mm
outi
outp
mirror
PBS
BS
14
????4
????????

• ????????????????????????????????????????????
  ??????????????.??????????????????????????????.

15
??

• 1.?????????
• 2.????
• 3.????
• 4.???

16
????
output?????????

• outp?? -1450mVouti?? -2000mV???midfringe???
  ???
• Visibilityoutp 81outi 74
• ref?? -6.4V

17
????2 ?intensity noise, shot noise????

• intensity noiseAOM??????,ref??output????????.r
  ef?noise spectrum?????????output?????intensity
  noise???
• shot noiseout1?out2????????

output
intensity noise
shot noise
18
????3 ?????????
???????????????????
????
??
19
????4 ???????
???????upper limit
???? Inline 13mm Perpendicular
8mm(??????,?????????????????)
20
????4 ?????????
???????????????
???????????????????????,??????????????????.(????
?????,?????????????)
geoid m/rHz
1Hz????rms1.310-7m
1sec?1???????????
21
????5 ????

• ?????????
• ????????

• ???????????? ?????????(0.4mm) ???????????????
  ??????????????? ??????
• ???????????????? ?????????????
  (??????????????? ????????)

ref????????
100mV

• ???????????????? ???? ??????3???? ????????

1ksec
22
??

• 1.?????????
• 2.????
• 3.????
• 4.???

23
???

• ???????????????????????? (??????????????????)
• cf.) ?????????????????????
  610-10m/s2(1Hz10-3Hz)
• CHAMP?????????310-9m/s2(10-1Hz10-4Hz)
• ??????????????????? ??????????,????????
• ????????????

1.310-7m
24
???2

• ??CHAMP?????????????????? CHAMP????????????
  10cm?? GPS?????????????????????

A first attempt at time-variable gravity recovery
from CHAMPusing the energy balance approach N.
Sneeuw et. al. (2002)
????????GPS??????
GPS?SLR??????????????????,??????????????????.
???????
FP????????????
???????
25
??????????????
26
??????

• ???????? ?????????????????????????
  ?????????????????. (Geoidetic Reference System
  1980) ??????????????????
• ?????????????? ??????????????????
  ???,????????????,?????? ???????????????cf.)????
  ??????????????,?????? ?????????? ?????

27
??????
N 10-3m, ? 10m/s2 T 10-2m2/s2

• (N ?????,? ?????)

(???????)
vm 7km/s(??500km) dv 110-6m/s (vm
?????)
GPS?SLR???????1mm??10sec?1??????,??????
2?????