Inertial Measurement Units

 

Allan variance plots of Optolink's fiber-optic gyroscopes

 

 

 

 

Parameter

FOG Accelerometers
Range of measured angular rate, FOG, deg/sec, accelerometers, g ±550

±10

Bias drift at stabilized temperature (100 s-averaging, 1σ), FOG, deg/hr, accelerometers, g × 10-3, (1σ) 0,05 0,1
Bias drift stability,  run-to-run at stabilized temperature (1 hour run, 100s-averaging), FOG, deg/hr, accelerometers, g×10-3, (1σ) 0,05

0,1

Bias drift stability,  run-to-run at stabilized temperature (1 hour run, 100s-averaging), FOG, deg/hr, accelerometers, g×10-3, (1σ) 0,1

0,5

Bias drift stability at specified temperature range with temperature gradient 0.4 deg/min, FOG, deg/hr, accelerometers , g×10-3,  (1σ) 0,2

0,3

Offset, FOG, deg/hr, accelerometers , g×10-3 ±0,3 ±0,5
Scale factor stability at temperature range from -40oC to +60oC, ppm  (3σ) 500

500

Scale factor offset, ppm ±100 ±100
Bandwidth (at - 3dB level), Hz 100

100

Magnetic field sensitivity, °/hr/mT ±0,1

-

Random walk at temperature +20°С, FOG , …º/√hr, accelerometers ,… µg /√Hz 0,012

80

Misalignment, arc.min 2

2

Стабильность осей чувствительности относительно плоскости посадочных мест, ' , не более

2

2

Power consumption, W, less than

5

Size, mm

80x95x62
Weight, kg

0,67

Time of functional readiness, sec, less than

3

Time of accuracy readiness min, less than

20

 

Allan variance plot for gyroscopes of IMU1000

Allan variance plot for accelerometers of IMU1000


 

IMU500 is based on Optolink’s three axis closed loop fiber-optic gyroscope TRS500 and three pendulum accelerometers

Gyro (TRS500)

Range of measured angular rate, °/s

±400

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

≤0.1
≤0.005 (Allan variance)

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

≤0.3

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

≤200

Random walk (Allan variance), °/√hour

≤0.007

Bandwidth, Hz

≥100 (up to 2kHz)

Accelerometer

Range of measured acceleration, g

±10g to ±40g

Bias repeatability, mg

≤0.5

Velocity random walk, µg/√Hz

≤20

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

≤300

Physical Characteristics

Misalignment, mrad

≤1.5 (≤0.3 mrad under request)

Output sample rate

up to 2000 Hz

Power supply, V

5 VDC or 24~36 VDC

Power consumption, W

≤10 W

Digital output interface

RS485 or RS422

Operation temperature 

-40°C ~ +60°C

Storage temperature

-40°C ~ +80°C

Dimensions

110 × 110 × 90 mm

Weight

 

1.4 kg

 

Allan variance plot of gyroscopes in IMU500

 


with extended  operation temperature range (-60°С ~ +60°С), waterproof

IMU500T is based on Optolink’s IMU500 unit with additional heating system that ensures successful operation at temperatures down to -60°С

Gyro (TRS500)

Range of measured angular rate, °/s

±400

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

≤0.1
≤0.005 (Allan variance)

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

≤0.5

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

≤300

Random walk (Allan variance), °/√hour

≤0.01

Bandwidth, Hz

≥100 (up to 2kHz)

Accelerometer

Range of measured acceleration, g

±10g to ±40g

Bias repeatability, mg

≤0.5

Velocity random walk, µg/√Hz

≤20

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

≤500

Physical Characteristics

Misalignment, mrad

≤1.5 (≤0.3 mrad under request)

Output sample rate

up to 2000 Hz

Power supply, V

24~36 VDC

Power consumption, W

≤15W normal, ≤80W (heating on)

Digital output interface

RS422 (RS485 under request)

Operation temperature 

-60°C ~ +60°C

Storage temperature

-60°C ~ +80°C

Dimensions

185 × 143 × 114 mm

Weight

 

2.6 kg

 

Allan variance plot of gyroscopes in IMU500T

 


IMU400C is especially constructed for oil/gas pipeline inspection cases, with geometry optimized for small pipeline diameters.

 

Gyro

Range of measured angular rate, °/s

±400

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

≤0.1
≤0.007 (Allan variance)

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

≤0.3

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

≤300

Random walk (Allan variance), °/√hour

≤0.01

Bandwidth, Hz

≥100 (up to 2kHz)

Accelerometer

Range of measured acceleration, g

±10g to ±40g

Bias repeatability, mg

≤0.7

Velocity random walk, µg/√Hz

≤30

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

≤300

Physical Characteristics

Misalignment, mrad

≤1.5 (≤0.3 mrad under request)

Output sample rate

up to 2000 Hz

Power supply, V

5 VDC

Power consumption, W

≤10 W

Digital output interface

RS422 (RS485 under request)

Operation temperature 

-40°C ~ +60°C

Storage temperature

-40°C ~ +80°C

Dimensions

Ø79 × 145 mm (mounting Ø90)

Weight

0.9 kg


IMU501 is based on three Optolink’s single axis closed loop fiber-optic gyroscope SRS501 and three pendulum accelerometers.

Gyro (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

≤0.1

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

≤200

Random walk (Allan variance), °/√hour

≤0.003

Bandwidth, Hz

≥100 (up to 2kHz)

Accelerometer

Range of measured acceleration, g

±10g to ±40g

Bias repeatability, mg

≤0.5

Velocity random walk, µg/√Hz

≤20

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

≤300

Physical Characteristics

Misalignment, mrad

≤1.5 (≤0.3 mrad under request)

Output sample rate

up to 2000 Hz

Power supply, V

24~36 VDC

Digital output interface

RS422 (RS485 under request)

Power consumption, W

≤20 W

Operation temperature 

-40°C ~ +60°C

Storage temperature

-40°C ~ +80°C

Dimensions

155 × 140 × 110 mm

Weight

 

3 kg

 

Allan variance plot of gyroscopes in IMU501

 


IMU501C is the version of IMU501 with improved characteristics, due to additional factory selection and specific calibration procedures

Gyro (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

Scale factor stability (1σ, at room temperature), ppm

≤100

≤50

Random walk (Allan variance), °/√hour

≤0.003

Bandwidth, Hz

≥100 (up to 2kHz)

Accelerometer

Range of measured acceleration, g

±10g to ±40g

Bias repeatability, mg

≤0.5

Velocity random walk, µg/√Hz

≤20

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

≤300

Physical Characteristics

Misalignment, mrad

≤1.5 (≤0.3 mrad under request)

Output sample rate

up to 2000 Hz

Power supply, V

24~36 VDC

Digital output interface

RS422 (RS485 under request)

Power consumption, W

≤20 W

Operation temperature 

-40°C ~ +60°C

Storage temperature

-40°C ~ +80°C

Dimensions

155 × 140 × 110 mm

Weight

 

3 kg

 

 


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.

Gyro (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)

Accelerometer

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

 


IMU1000 (IMU1001*) is based on three Optolink’s single axis closed loop fiber-optic gyroscope SRS1000 (SRS1001*) and three pendulum accelerometers.

Gyro (SRS1000, SRS1001*)

Range of measured angular rate, °/s

±90 (±550*)

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

≤0.005
≤0.0005 (Allan variance)

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

≤0.03

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

≤100

Random walk (Allan variance), °/√hour

≤0.0007

Bandwidth, Hz

≥100 (up to 2kHz)

Accelerometer

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

≤100

Physical Characteristics

Misalignment, mrad

≤0.3 mrad

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

171 × 224 × 252 mm

Weight

 

6 kg

 

Allan variance plot of gyroscopes in IMU1000

 

The export of IMU1000/IMU1001 is under strict government control due to its precision characteristics. Export license is granted upon the International Import Certificate (End Use Certificate) issued by the authorized Ministry of the end user’s country and the end use certificate issued by the ultimate end user reflecting the detailed intended civil end use of the Goods. Besides that, the end user company undertakes to grant the right to inspect the Goods supplied at any time. Please allow 2-3 months for the process; positive outcome is not guaranteed even in case all the required documents are presented



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