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Size: 1337
Comment:
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Size: 1686
Comment:
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| Deletions are marked like this. | Additions are marked like this. |
| Line 5: | Line 5: |
| * geophoneのcalibration | = geophoneのcalibration = |
| Line 10: | Line 10: |
| 参考 | * 参考 |
| Line 16: | Line 16: |
| * geophoneの周波数応答 | == geophoneの周波数応答 == |
| Line 36: | Line 36: |
| * Horizontal | * フィルターの形 |
| Line 38: | Line 38: |
| * Vertical | {{attachment:Hgeo_filter.png||width=800}} == calibration filter == * 速度に変換する式 Velocity [um/s/cnt] = (Volt2Count [V/cnt])/(Hgeo [V/(m/s)]) /(Preamp gain) * (DCcutoff) * 10^6^ * Volt2Count : 20V / 2^16^ = 3.052 × 10^-4^ V/cnt * Preamp gain : 938.8 ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=3893|klog3893]]より) |
19/05/22
What we did
geophoneのcalibration
今のところ(追記，19/05/24現在)，フィルター通過後のgeophoneの信号が変になったり，発散する様子は見られない。 データシートを元に，geophoneのcalibrationファクターを詰めた。
- 参考
geophoneの周波数応答
- G_e: Generator Constant [V/(m/s)]
- η : Damping ratio
- ω0:Resonant angular frequency of geophone [rad/s]
geophone |
serial number |
G_e |
η |
ω0=2pi*f0 |
Hgeo |
H1 |
#4 |
287.91 |
0.285 |
2pi*1.01 |
|
H2 |
#5 |
285.68 |
0.284 |
2pi*1.01 |
|
H3 |
#2 |
281.92 |
0.290 |
2pi*0.97 |
|
V1 |
404084242 |
274.76 |
0.296 |
2pi*0.96 |
|
V2 |
404080976 |
286.11 |
0.299 |
2pi*1 |
|
V3 |
404084241 |
273.74 |
0.293 |
2pi*1 |
- フィルターの形
calibration filter
- 速度に変換する式
Velocity [um/s/cnt] = (Volt2Count [V/cnt])/(Hgeo [V/(m/s)]) /(Preamp gain) * (DCcutoff) * 106
Volt2Count : 20V / 216 = 3.052 × 10-4 V/cnt
Preamp gain : 938.8 (klog3893より)