Designs Work Group Logo

home

saving the day

specialty disciplines

generic disciplines

top 5 designs

why to use us

why to not use us

contact info

Designs Work Group

home : saving the day
Noise Problems
Noise problems in a medical instrument

The manufacturer of this instrument, which uses visible and near-infrared radiation, had been receiving field reports of erroneous readings, but were unable to reproduce them in house. We performed a theoretical study of the signal processing methods embedded in the device, enabling us to predict the types of interference that might generate measurement errors. The predictions were then proven by experiment. Seventeen error sources were considered and quantified, including several types of light sources, external sources of electric and magnetic fields, and self-generated errors. Design changes were recommended along with the expected effect of each change on each error source.