The Matchbox IMU incorporates
3 Axlgyro sensors. The accelerometer requires one analog servo loop,
and the gyro requires two servo loops—one for keeping the amplitude of
the flutter angular momentum constant, and the other for rebalancing
the flutter. These three servo loops are packed in two small boards
with surface mount components, and interconnected together via edge
mounted 26 pins.
The above schematic shows a simple laser drive for methane
gas sensor. Since the goal was to make the package as small
as possible, no thermoelectric cooler was employed. The
current through the laser is controlled to 33% of the
allowable max capacity.
