A Next Generation Electrodynamic Shaker for the Primary Calibration of Accelerometers
Beverly F. Payne, Kari K. Harper
A shaker system was designed to allow direct primary calibration of accelerometers using both reciprocity and interferometer techniques over the frequency range 40 Hz to 10,000 Hz. The system use dual magnets and a dual-coil moving element. The design uses damped flexures to support the moving element. The dual-coil feature eliminates the need for an additional shaker for reciprocity calibrations. Two shaker systems were constructed and installed. One was installed at NIST. The second calibration system was installed in the USAF primary calibration laboratory, Heath, OH to establish a primary calibration facility for the USAF. Inter-comparison calibrations were performed on the shakers to verify that both systems are operating within calculated uncertainty limits.