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An Absolute Method of Piezo-Electric Accelerometer Calibration.
A Q D LABS HAREFIELD (ENGLAND)
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A fundamental method of calibrating accelerometers has been developed which measures dynamic displacement, the essential and difficult parameter, by a pair of differentially coupled solar, silicon photo-cells which are calibrated statically against a length standard. The method employs a null technique, is fast in operation requiring only the adjustment of a precision, variable capacitor and is largely independent of vibrator, driving source waveform. The facility provides calibration in the frequency range 200 Hz to 5000 Hz at acceleration levels up to 50 g with an uncertainty not greater than plus or minus 3. Author
APPROVED FOR PUBLIC RELEASE