Measuring and testing – Instrument proving or calibrating – Speed – velocity – or acceleration
Reexamination Certificate
2006-07-18
2006-07-18
Garber, Charles (Department: 2856)
Measuring and testing
Instrument proving or calibrating
Speed, velocity, or acceleration
Reexamination Certificate
active
07076991
ABSTRACT:
An acceleration sensor (22) to be calibrated and evaluated is affixed to one end surface (22) of a metal rod (1), and a plurality of projectiles (3) are made to impact the other end surface (2) of the metal rod at prescribed time intervals, generating an elastic wave pulse in the metal rod. Dynamic displacement, velocity or acceleration in a direction normal to the other end surface arising in a process of the generated elastic wave pulse reaching and being reflected by the one end surface where the acceleration sensor is affixed is measured, and an acceleration measured, processed and corrected by a strain gauge (25) attached to a side surface of the metal rod or by a laser interferometer (24) is obtained, and the corrected acceleration and the output of the acceleration sensor are compared to thereby carry out calibration and evaluation of the acceleration sensor.
REFERENCES:
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patent: 5952554 (1999-09-01), Umeda
patent: 6286359 (2001-09-01), Umeda
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Umeda, Akira et al. “Frequency Characteristics of Accelerometers Measured by Impact in Low Frequencies”, The Japan Society of Mechnical Engineers, pp. 477-482, with English abstract 1994.
Garber Charles
National Institute of Advanced Industrial Science and Technology
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