DMU41 평가 키트

빠르게 테스트하고, 데이터를 캡처하며 결과를 평가합니다.

DMU41 평가 키트를 이용하면 DMU41에서 나온 데이터를 검토하고 평가 및 개발 테스트 목적으로 저장할 수 있습니다. DMU41 EVK는 사용자가 DMU41 인터페이스 파라미터를 손쉽게 재구성하여 호스트 시스템의 요구 사항에 맞출 수 있는 기능도 제공합니다. 키트에는 별도로 구매해야 하는 IMU는 포함되지 않습니다.

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DMU41 평가 키트
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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