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Testing and Deployment of the Water Vapor Sensing System II - page 9 / 15

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Presentation Title

Calibration Changes

to the Pressure/Temperature Matrix

 Previous WVSSII calibration was not tailored to individual sensors, but rather used 16 different pre-generated matrices, selecting the one of 16 P/T matrices which most closely optimized senor output.

 Despite 2008 improved sensor electronics, the WVSSII performance at the factory and on NWS test stand was not performing to required standards.

 SSI conducted an analysis of the P/T calibration methodology and made the following changes:

 Software allows for calibration of non-linear values below 3,000 PPMV

 Improved accuracy of the P/T matrix mapping by using a single matrix tied to each sensor’s 3rd degree polynomial calibration coefficients

 Computed rather than stored P/T matrix.

 Advantage of P/T matrix is that the software is the same for every system with the only difference being in the coefficients of the terms of the equation.

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