Publications by authors named "Muhammad Y Afridi"
A new method is described to provide a primary calibration of shock measurements produced by a shock measurement system consisting of pendulum excitation and laser Doppler velocimetry. The method uses the laser Doppler velocimeter to determine the total distance traveled by a rigid block that slides along a Teflon (fluorocarbon) channel after being struck by a pendulum head, and the resulting distance is compared to the distance measured by an SI-traceable length measurement. The instantaneous velocity of the block is measured by the velocimeter and is used to calculate the displacement of the block by integrating the velocity data.
View Article and Find Full Text PDFGravity-Based Characterization of Three-Axis Accelerometers in Terms of Intrinsic Accelerometer Parameters.
J Res Natl Inst Stand Technol
July 2017
Article Synopsis
- Cross-sensitivity matrices are essential for converting three-axis accelerometer responses into specific acceleration components based on the gimbal's orientation in a gravitational field.
- The uniqueness of these matrices varies depending on how the accelerometer is mounted on the gimbal, necessitating the definition of nine intrinsic parameters that can be measured or calculated from these matrices.
- By comparing intrinsic parameters derived from independently measured cross-sensitivity matrices, institutions can identify and isolate differences related to alignment and measurement errors in their gimbal setups.