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.

Gyroscopes (SRS501)

Range of measured angular rate, °/s

±250 (optional ±1000)

Bias drift at fixed temperature (100s-averaging, 1σ), °/hour

≤0.03
≤0.002 (Allan variance)

Bias drift at changing temperature from -40°C to +60°C
(100s-averaging, 1σ), °/hour

≤0.05

Scale factor error in temperature range -40°C to +60°C (1σ), ppm

≤100

Random walk (Allan variance), °/√hour

≤0.003

Bandwidth, Hz

≥100 (up to 2kHz)

Accelerometers

Range of measured acceleration, g

±10g to ±40g

Bias repeatability, mg

≤0.3

Velocity random walk, µg/√Hz

≤15

Scale factor error in temperature range -40°C to +60°C (1σ), ppm

≤150

Physical Characteristics

Misalignment, mrad

≤0.3

Output sample rate

up to 2000 Hz

Power supply, V

24~36 VDC

Power consumption, W

≤20 W

Digital output interface

RS422 (RS485 under request)

Operation temperature 

-40°C ~ +60°C

Storage temperature

-40°C ~ +80°C

Dimensions

Ø142 × 280 mm

Weight

 

6.4 kg

Allan variance plot of gyroscopes in IMU501D

 

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