Meaning
Digital signal processing algorithm that smooths noisy experimental concentration data using local polynomial regression preserves the underlying composition profiles without distorting their shape. In microanalysis, the Savitzky Golay filter is used to reduce high-frequency noise in raw elemental scans from electron probes. Compliance laboratories certified by CNAS must apply this smoothing to produce clean diffusion profiles.
This algorithm is the preferred choice in industrial standard procedures because it does not shift the location of concentration peaks.
Profile Smoothing
Raw intensity measurements from scans often carry statistical noise that complicates numerical differentiation. Applying the Savitzky Golay filter allows for the calculation of smooth gradients while maintaining the exact position of the interface. This filtering technique avoids the peak broadening associated with simpler smoothing methods.
Testing Regulations
Standardization authorities in China require that all data filtering methods be fully documented in metallurgical test files. Industrial standards under SAC mandate that smoothing parameters like window size and polynomial degree be reported. These guidelines ensure that reported profiles are reproducible.
Operational Limit
Data submissions that cannot be reproduced using the declared smoothing parameters are rejected during technical audits. Chinese manufacturers must ensure their testing devices are calibrated according to these national data-handling standards. These steps are necessary to pass government safety audits.
