About misterMark

Hi there, sorry for the delay in my reply. We have three sensors, and we are trying to measure the magnetic field gradient between the sensors (ie. the DIFFERENCE in magnetic field).  For example: to calculate the gradient between Sensor 1 and Sensor 3 in the picture below, we subtract Sensor1's measurement from Sensor3's measurement. But we need to know the DISTANCE over which the gradient is measured, so we can get the gradient in MicroTesla / Metre. We assumed that the three axes measure with respect to the same location in the center of the sensor, see A below. But this appears not to be the case. Maybe the origin is offset and all three are measured on one side? or maybe the axes all measure from different points in the sensor IC?   I hope this clarifies my question.  Where do each of the axis measure from?   Thanks!     ... View more

Has anybody figured this one out?  Does Bosch have any documentation about the locations of their sensors' axis datums?  The chip is small, and for many applications it could be considered a point source. but with my array here I need to know where each measurement is taken  ... View more

Thanks for the quick replies, BSTRobin!  That's helpful to know that the three axes are independent. Is there any data about where each axis is located?   The three origins would be helpful on their own, and could still help for my model. Correct I am trying to use an array of BMM150s , and my model would benefit to know precisely where every measurement is being measured within the BMM150.  In my application I am sampling small, passive magnetic fields, and analyzing the gradient dropoff from the source. When nearby to a magnet, even a fraction of a millimeter can have a huge impact on the strength of the field measurements. So I'd like to be as precise as possble.  ... View more

That shows axis orientation with respect to the sensor IC body, but it doesn't indicate origin position. There is no indication that the Dot on the casing is the measurement site, I think its just a landmark to show the top-right of the IC. ... View more