Inertial Measurement Unit IMU501D
IMU501D is especially constructed for oil/gas pipeline inspection cases requiring high precision, with geometry optimized for medium to large pipeline diameters. IMU501D is based on three Optolink’s single axis closed loop fiber-optic gyroscope SRS501 and three pendulum accelerometers.
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Gyroscopes (SRS501)
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Range of measured angular rate, °/s
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±250 (optional ±1000*)
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Bias drift at fixed temperature (100s-averaging, 1σ), °/hour
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≤0.03
≤0.005 (Allan variance)
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Bias drift at changing temperature from -40°C to +60°C
(100s-averaging, 1σ), °/hour
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≤0.05
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Scale factor error in temperature range -40°C to +60°C (1σ), ppm
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≤100
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Random walk (Allan variance), °/√hour
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≤0.003
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Bandwidth, Hz
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≥100 (up to 2kHz)
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Accelerometers
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Range of measured acceleration, g
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±10g to ±40g
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Bias repeatability, mg
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≤0.3
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Velocity random walk, µg/√Hz
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≤15
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Scale factor error in temperature range -40°C to +60°C (1σ), ppm
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≤150
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Physical Characteristics
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Misalignment, mrad
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≤0.3
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Output sample rate
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up to 2000 Hz
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Power supply, V
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27±5 VDC
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Power consumption, W
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≤20 W
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Digital output interface
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RS-422
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Operation temperature
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-40°C ~ +60°C
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Storage temperature
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-40°C ~ +80°C
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Dimensions
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Ø142 × 280 mm
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Weight
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6.4 kg
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Allan variance plot of gyroscopes in IMU501D
*for export the available dynamic range is limited by ±495°/s
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