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Trillium Cascadia
Summary
The Trillium Cascadia is the result of marrying the world's best class A accelerometer with the world's most popular seismometer. This dual-use, ultra-wide dynamic range sensor measures both strong motion and weak motion, with absolutely no compromise in performance. And with one hole to dig, a single connector, a single cable and sensors that are guaranteed to be mutually aligned to north, proper deployment is virtually effortless.
Why Trillium Cascadia?
- Highly portable, easy to install, no vault required
- Will never go off scale
- Ideally suited for applications where the amplitude range is unpredictable
- Suitable for harsh environments, resistant to flooding
- Minimal site footprint
- Each sensor independently serviceable
- Low cost of deployment/low cost of ownership
- Maximizes scientific return on investment
Specifications
Specifications are subject to change without notice.
SEISMOMETER MODULE TECHNOLOGY |
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| Topology | Symmetric triaxial |
| Feedback | Force balance with capacitive displacement transducer |
| Mass centering | Not required |
SEISMOMETER MODULE PERFORMANCE |
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| Sensitivity | 754.3 V*s/m nominal ±0.5% precision |
| Off-axis sensitivity | ±0.5% |
| Bandwidth | -3 dB points at 120.2 s and 108 Hz |
| Transfer function | Lower corner poles within ±0.5% of nominal provided
High frequency response within 1 dB of nominal up to 45 Hz No peak in response at high frequency |
| Clip level | 26 mm/s from 0.1 Hz to 10 Hz |
| Dynamic range | > 152 dB @ 1 Hz |
| Tilt | Dynamic and operational tilt range of ±2.5º |
| Parasitic resonances | None below 200 Hz |
ACCELEROMETER MODULE TECHNOLOGY |
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| Topology | Triaxial, horizontal-vertical |
| Feedback | Force balance with capacitive displacement transducer |
| Centering | Automated electronic offset zeroing via user interface |
| Full-scale range | Electronically selectable
Independent vertical and horizontal configuration |
ACCELEROMETER MODULE PERFORMANCE |
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| Bandwidth (-3 dB) | DC to 430 Hz |
| Dynamic range | 166 dB @ 1 Hz over 1 Hz bandwidth
155 dB, 3 to 30 Hz |
| Offset | Electronically zeroed to within ±0.005 g
Offset trimming range ±0.05 g |
| Non-linearity | < 0.015% total non-linearity |
| Hysteresis | Less than 0.005% of full scale |
| Cross-axis sensitivity | Less than 0.5% total |
| Offset temperature coefficient | Horizontal sensor: 60 µg/ºC, typical
Vertical sensor: 320 µg/ºC, typical |
HARDWARE INTERFACE |
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| Connector | 26-pin connector
Submersible Glenair 802-013-02Z110-26E |
| Calibration input | Single voltage input and one active-high control signal to enable all three channels
Independent channel selection by serial port |
| Seismometer module velocity output | 40 Vpp differential
Selectable XYZ (east, north, vertical) or UVW mode |
| Seismometer module mass position output | Single voltage output representing maximum mass position
Three-channel mass positions available through serial port |
| Acclerometer module acceleration output | 40 Vpp differential |
| Acclerometer module control input | Single control signal can be configured to initiate auto-zero, initiate self-test or enable calibration |
| Accelerometer module status output | Asserted: Unit OK, output signal valid Deasserted: Self-test in progress or failed, auto-zeroing in progress, calibration enabled, or starting up |
DIGITAL COMMAND AND CONTROL INTERFACE |
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| Digital interface | RS-232 compatible serial-over-IP (SLIP) Onboard web server standard HTTP |
| Seismometer module digital commands | XYZ/UVW mode switching, calibration channel selection (off, enable all, U, V, or W), short period/long period mode switching, firmware updates, state-of-health request, upload user calibration data |
| Seismometer module digital data outputs | Independent mass position values, instrument temperature, factory sensitivity and sensor response data, user calibration data (poles and zeroes), instrument serial number and firmware revision, virtual bubble level display for levelling |
| Accelerometer module digital commands | Gain range selection, auto-zero (or set to specific offset), self-test, calibration enable, state-of-health request, firmware updates |
| Accelermoeter module digital data outputs | Sampled XYZ outputs (in volts and g), instrument temperature, trimmer settings, instrument serial number, hardware assemblies and firmware revisions |
POWER |
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| Supply voltage | 9 to 36 V DC isolated inputs |
| Power consumption | Seismometer module: 180 mW typical quiescent Accelerometer module: 1.1 W typical quiescent |
| Protection | Reverse-voltage and over-voltage protected Self-resetting over-current protection |
| Isolation | Supply power is isolated from signal ground |
| PHYSICAL | |
| Diameter | 96.4 mm (3.79") |
| Height | 215.9 mm (8.5") overall height of unit 230.8 mm (9.08") unit with connector 237.8 mm (9.37") unit with connector and feet |
| Housing | Stainless steel |
ENVIRONMENT |
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| Operating temperature | -20°C to 60°C |
| Storage temperature | -40°C to 70°C |
| Shock | 100 g half sine, 5 ms without damage, 6 axes
No mass lock required for transport |
| Magnetic sensitivity | Insensitive to natural variations of the earth's magnetic field |
| Water immersion | Rated to IP68 for prolonged submersion |
Performance
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