Tuesday, January 4, 2011
On Nested Polynomials
At work we use quartz pressure gauges to measure downhole pressure in a reservoir. The gauges are extremely accurate and employ a clever temperature correction scheme. They are calibrated at a test facility somewhere in the States and sent to us as a kit. The calibrations take the form of nested polynomials, the coefficients of which have to be entered manually into an acquisition system. Apparently computers prefer crunching this form of equation to the regular type. Here is what they look like (more or less).