Hello,

I have a question, please.

Does ADIS16209 allow getting, in digital form, the data regarding tilt angles of two axes in the ranges and with the accuracy specified in the documentation, if during measurement it's affected by the arbitrarily changing force? In other words, if at the time of the measurement, the ADIS16209 would be based on the platform which moves in the space with some arbitrary acceleration (no more than 1,7g) on all three axes?

Thank You

The combination of gyroscope and accelerometer is not good, because that silicon gyroscopes have a very large time and temperature drift.

NevadaMark>> I understand how you feel, but this is the method that most are using to address this very issue. There are 1000s of applications that would value an accelerometer-only solution to this problem, but I am not aware of any at this at this time, which can be broadly applied to all situations. The key IP in the accel/gyro approach seems to lie in developing application-specific algorithms that blend the benefits of the low-drift accelerometers and the non-linear responding gyroscopes.

After some thought, the questions arose.

Why ADIS16209 gives not only the angles and also acceleration values on the axes?

NevadaMark>> Are you asking if we purposely withheld a capability that could be valuable and would help us sell more ADIS16209 products? I am probably misunderstanding but wasn't sure how to answer this.

Can ADI offers some algorithms and math to calculate the correct angles for accelerated motion?

NevadaMark>> As I said above, an accelerometer-only solution would be highly valued in the market and many have tried. Acceleration tends to be transient in nature so you could start with the low-pass filtering (AVG_CNT), but the trade-off will be in the time lag. 0.1 degree of accuracy relates to less than 2mg of acceleration error, or ~20mm/sec^2. Assuming the time lags are unacceptable, it would seem like more sophisticated approaches would need a deeper understanding of the actual motion, in order to help develop a strategy for rejecting the linear motion, without impacting the orientation accuracy (which could be changing as well).

Maybe you have a link where a device ADIS16209 is described in more detail exactly MEMS inclinometer.

What's inside - accelerometer with MPU with some additional math , which in addition to the acceleration data calculates the angles in the absence of motion (ie, in the case of exposure to gravity only)?

NevadaMark>> The signal path is pretty simple. Accelerometer -> Calibration -> Filtering -> asin or atan -> angles. You are correct, the angle computation assumes gravity-only influence.