Ultra-precise motion sensing performance from a MEMS IMU that competes directly with much heavier, larger, less reliable, and more costly, fibre optic gyro-based units.

DMU41 is our latest six-degree-freedom High Performance IMU (HPIMU). It is a ground-breaking, affordable, non-ITAR, MEMS alternative to ‘FOG-Grade’ IMUs. It takes proven performance and reliability from its predecessor; the highly popular DMU30, but packages it in a smaller form and with added user functionality. DMU41 is an impressive SWaP-C IMU measuring 50x50x50mm, weighing under 170g and consuming less than 2.5W.

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Production Status: In Production
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Availability: Available
Customer Applications: New and existing applications

DMU41 high performance imu sensor
Supply Voltage4.75V to 32V
Angular Random Walk0.02˚/√hr
Bias Instability0.1°/hr, 0.015mg
Bandwidth (nominal)IMU>77Hz Acc sencor 250Hz Gyro sensor 150Hz
Operating Temperature-40°C to +85°C
Typ. Current Consumption125mA (at 12V)
Angular Rate Range±490˚/s
Current Consumption125mA (at 12V)
Axes of Acceleration3
Velocity Random Walk 0.05m/s/√hr
Axes of Angular Rate3
Noise Spectral Density Gyro0.05 °/s rms
Noise Spectral Density Acc0.9 mg rms
Rate SF over Temp-700ppm to +700ppm (over life)
Rate Bias Over Temperature-30°/√h to +30°/√h (over life)
Acc Bias over Temp-7mg to +7mg (over life)
Acc SF over Temp-1000ppm to +1000ppm (over life)
Baud Rate460800
Accelerometer Bias Instability15μg 1sigma to 30μg Max
Vibration Rectification Error-0.006°/s/g2 rms to 0.006°/s/g2 rms
CAD Files

3D files on this site are provided for indication only using nominal dimensions. They do not accurately represent the actual dimensions of any Silicon Sensing product shown on our website. It is solely for the customer to determine whether the product (including the dimensions) is suitable for their specific application.

Example CAD Files
Please explain DMU41's Delta Theta and Delta Velocity outputs

The basic inertial data output from DMU41 is angular rate (deg/s) and acceleration (g). Delta Theta and Delta Velocity outputs can be considered as a re-scaling of these basic data outputs. Provision and use of these values is an industry standard expected and used by many of our customers.

Delta Theta is in degrees and represents the degrees rotated over the sampling time of 5.0ms (or 1/200th of a second). For example, if the IMU axis is rotating at 200deg/s, Delta Theta will be 1 deg.

Similarly, Delta Velocity is a re-scaling from g to m/s, representing the change in velocity change over the same 5ms. The output in m/s is equal to the acceleration in g multiplied by 0.04903325 (divide by 200 and multiply by 9.80665, the latter being a universal measure of g).

What is the resolution of sensor data inside DMU41?

24-bit sigma delta analogue to digital convertors are used within DMU41. Compensation is carried out using single precision floating point mathematics. The DMU41 output message is also output as single precision floating point numbers. So, the mathematical resolution is very small indeed.

In practical terms, the minimum resolvable change is dominated by the sensor noise. With averaging, this can be improved to a point where the minimum resolvable change is dictated by the bias instability derived from Allan Deviation plots. For the gyro channels this is below 0.1 deg/hr and for the accelerometers, around 10μg.

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