This instrument incorporates the same symmetric tri-axial design and suspension system as the highly successful Trillium 40. The design employs fewer parts than traditional sensors and offers improved temperature stability. The robustness and reliability of the mechanical suspension is well proven. With more than 500 Trillium 40 units operating in the field, there have been no mechanical failures.
As with all Trillium sensors, the 120P does not have a mass lock, instead using a field proven suspension system capable of withstanding the rigors of field handling and transportation. During deployment the sensor requires only manual leveling before operation.
Nanometrics
1. 인공위성시스템을 세계 최초로 지진연구에 도입
2. 지진과 환경 분야에서의 디지털 및 네트워크 기술에 세계적인 선도 기업
3. 광대역 전송 지진계 ( Broadband seismometer )
4. 지진파의 실시간 원격측정 네트워크(Rreal-time seismic telemetry network )
5. 자체 노이즈 보정 ( Self noise performance )
6. 카나다의 북극해와 같은 극한( 極寒, 매우추운) 상황에서도 장기간 안정적으로 사용가능
7. 휴대와 고정형 양쪽으로 모두 사용가능
( Portable and permanent observatory )
8. 쯔나미 지진해일 경고 시스템 (Tsunami Warning System )
9. 해저 지진 탐사 ( Survey of the submarine mountain range )
10. 인공위성과 인터넷 ( internet and satellite )을 통한 통신
(지진연구용 인공위성 시스템 )
11. 지역과 전 세계의 데이터를 수집하고 교환할 수 있는 common platform을 제공
References
New Low-Noise Model (NLNM) from Peterson (1993)
Observation and Modeling of Seismic Background Noise
PDF Mode Low-Noise Model (MLNM) from McNamara and Buland (2004)
Ambient Noise Levels in the Continental United States
Event Magnitudes from Clinton and Heaton (2002)
Potential Advantages of a Strong Motion Velocity Meter Over a Strong Motion Accelerometer
Trillium 120P Technical
Specifications
| TECHNOLOGY |
|
| Topology |
Symmetric triaxial |
| Feedback |
Force balance with capacitive transducer |
| Mass centering |
Operates over full temperature range without manual re-centering;
Manual centering control included |
| Leveling |
Integrated bubble level; Adjustable locking leveling feet |
| Alignment |
Vertical scribe marks for N/S; Precision N/S guide in top of cover for straight-edge,
line or laser level; Precision holes for 5/16" alignment rod for E/W |
| |
|
| PERFORMANCE |
|
| Self noise |
4 dB above the NLNM at 100 seconds and below the NLNM up to 10 Hz |
| Sensitivity |
1201 V*s/m ±0.5% |
| Bandwidth |
-3 dB points at 120s and 175 Hz |
| Transfer function |
Lower corner poles within ±0.5% of nominal provided; High frequency poles
and zeros within ±5% of nominal provided |
| Clip level |
> 15 mm/s up to 1.5 Hz |
| Temperature |
±45°C without re-centering |
| |
|
| INTERFACE |
|
| Connector |
19-pin MIL-C-26482, mounted in base |
| Velocity output |
40 V peak-to-peak differential; Selectable XYZ or UVW mode |
| Mass position |
Three independent voltage outputs |
| Calibration input |
Single voltage input with one active high control signal per channel; Calibration
in XYZ or UVW, selectable via control lines |
| Serial port |
For retrieval of sensor response information and instrument control |
| |
|
| POWER |
|
| Supply voltage |
9 to 36 volts DC isolated input |
| Power consumption |
650 mW typical at 15 V input |
| Protection |
Reverse-voltage protection; Auto-resettable over-current protection
(No fuse to replace) |
| |
|
| PHYSICAL |
|
| Diameter |
21.0 cm |
| Height |
20.9 cm to 21.8 cm depending on leveling feet extension |
| Weight |
7.2 Kg |
| Handling |
Detachable lifting handle included |
| |
|
| ENVIRONMENTAL |
|
| Operating temp. |
-20°C to +50°C |
| Humidity |
0 to 100% |
| Shock |
20g half sine, 5 ms without damage, 6 axes;
No mass lock required for transport |
| Packaging |
Rated to IP68 and NEMA6P for outdoor use |
