FFT Inclinometer

Product info

FFT inclinometer solves attitude detection affected by strong vibration interference, outputting stable and accurate roll/pitch tilt angles. It performs in-time three-axis FFT vibration analysis (time & frequency domain), real-time data collection, etc. It improves platform leveling efficiency while motor/hydraulic devices are running and suits both static and dynamic measuring.

Most moving or rotating equipment (such as motors) produce acceleration/vibration. This vibration-induced noise disturbs true inclination measurement. Because random vibration directions are not necessarily perpendicular to the sensor’s sensitive axis, larger cross-axis error appears (with ~3% cross-axis sensitivity, errors can reach ~5° or more).

Market-typical MEMS capacitive sensors are highly sensitive to vibration and struggle to achieve high accuracy using only internal HW/SW filtering; electrolyte sensors cannot avoid low-frequency vibration noise either. Thus vibration influence must be addressed to obtain high-accuracy tilt in vibrating environments.

To ensure coincidence between inclination direction and vibration direction during measurement, Vigor adopts special assembly technology to realize very high axis alignment/orthogonality between tilt axes and X/Y/Z vibration axes, ensuring vibration data has the highest confidence.

FFT inclinometer combines vibration analysis with advanced time- and frequency-domain signal processing, real-time collection, alarms, and storage. Time-domain processing includes a programmable binary filter and selectable windowing. Frequency-domain processing includes a 512-point, real-valued FFT for each axis with FFT averaging. Modes include ordered FFT start, auto FFT, ordered time-domain capture, real-time mode, etc., with configurable vibration bandwidth and alarm points.

Main vibration features

• Tri-axis vibration range adjustable 0g to ±1g/±5g/±10g/±20g; response ≤5 kHz
• Real-time sample rate 20.48 kSPS; timing/external triggers; programmable filter (11 rates)
• 512-point, real-valued FFT on X/Y/Z; windowing: rectangular, Hanning, flat top
• Programmable alarms, 6 spectral bands, dual thresholds (warning/failure), adjustable response time

Tilt measurement capabilities

• ±0.02%FS linearity
• ±0.005° Offset
• Optional gyro module for static/dynamic leveling
• Performance confirmed for offset, repeatability, hysteresis, turn-on repeatability
• Advanced algorithms drastically reduce cross-axis error and improve true tilt accuracy
• Patent error calculation & calibration method improves accuracy & reliability
• Greatly reduced errors when real tilt direction differs from sensitive direction
• Short-circuit, transient voltage, and transposition protection for industrial environments
• User-configurable: zero point, baud rate, local g-value, zero calibration, vibration filter coefficients, ID, refresh rate, etc.

Applications

Railway track inspection instruments, Construction machinery, Mining machinery, Agricultural machinery, Train control, Test equipment, Movement/rotational vibration scenarios

Ordering

Example: Dual-axis FFT inclinometer, range ±30°, room temperature accuracy ±0.02°, −20~60 ℃ accuracy ±0.02°, CAN 2.0 output, 5 m cable with plug, with vibration module — model: SST302-30-G3-F5-00-C1-D3 (5m)

Other options (see Table 4): Magnetic base — order no. SST003-01-01

Table 3 — Accessories

Table 4 — Options