DMU41

Détection ultra-précise des mouvements grâce à une unité IMU MEMS qui rivalise directement avec les unités gyroscopiques à fibre optique, beaucoup plus lourdes, plus grandes, moins fiables et plus coûteuses.

DMU41 est notre toute nouvelle unité IMU haute performance (HPIMU) à six degrés de liberté. Elle s’agit d’une alternative MEMS révolutionnaire, abordable, non ITAR, aux IMU de qualité « FOG ». Elle reprend les performances et la fiabilité éprouvées de son prédécesseur, le très populaire DMU30. Il est toutefois plus petit et présente des fonctionnalités supplémentaires pour l’utilisateur. DMU41 est une unité IMU SWaP-C remarquable, qui mesure 125 cm3, pèse moins de 170 g et consomme moins de 2,5 W.

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État de la production : En production
Les commandes en ligne sont actuellement indisponibles.
Contactez-nous directement à l’adresse suivante : sales@siliconsensing.com
Disponibilité : disponible.
Applications clients : applications nouvelles et existantes

DMU41 high performance imu sensor
DMU41
Supply Voltage4.75V to 32V
Angular Random Walk0.02˚/√hr
Bias Instability0.1°/hr, 0.015mg
Bandwidth (nominal)IMU>77Hz Acc sensor 250Hz Gyro sensor 150Hz
Operating Temperature-40°C to +85°C
Typ. Current Consumption125mA (at 12V)
Angular Rate Range±490˚/s
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 Rate115200/ 230400/ 460800/ 921600
Accelerometer Bias Instability15μg 1σ to 30μg Max
Vibration Rectification ErrorAcc: ±0.006°/s/g²rms Gyro: ±0.15mg/g²rms
Datasheet
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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