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Welcome to Silicon Sensing

Navigation, positioning and like tasks require high performance sensors, which nevertheless must continue to operate to specification in difficult real-world environments.Over the last 20 years, Silicon Sensing has continued to push the boundaries of performance using patented silicon MEMS sensor structures manufactured in our own foundry in Japan.  Independent measures of sensor capability (such as bias instability and Angular Random Walk) confirm that our gyros now have capability matching that of more expensive (and larger, heavier and less reliable) fibre-optic based systems.

To find out more, see below or click the product image opposite.  To talk to us simply submit the brief form, below, and we will be in touch.

A little bit more about the DMU30

Product description

High Performance MEMS IMU

An affordable non-ITAR MEMS IMU alternative to 'FOG-Grade' IMUs for use in exacting motion sensing applications.

The first of a family of High Performance IMUs (HPIMUs), DMU30 is a ground-breaking, non-ITAR, MEMS IMU for use in applications ranging from unmanned vehicle navigation to surveying and mapping.

Available now, the DMU30 is proving a formidable choice for affordable high-performance IMUs.  Two standard variants offer different baud rates to suit application needs.  Datasheet and Solid Model CAD files for the DMU30 can be downloaded from the Downloads tab.

The basic inertial data output from DMU30 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).

24-bit sigma delta analogue to digital convertors are used within DMU30. Compensation is carried out using single precision floating point mathematics. The DMU30 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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