Method for testing frequency response characteristics of laser d

Details Method for testing frequency response characteristics of laser d Method for testing frequency response characteristics of laser d

1996-08-15

1999-09-14

Williams, Hezron

Measuring and testing

Instrument proving or calibrating

Displacement, motion, distance, or position

73 186, 73 182, 356345, 356358, G01B 2100, G01B 902, G01N 2900

Patent

active

059525541

ABSTRACT:
A method of testing frequency characteristics of a laser displacement/vibration meter by the use of a novel method which can cope with a broader frequency range and finer micro-level displacements to enhance the reliability of the displacement/vibration meter. Upon applying impact on one end face of a round metal rod, an elastic wave pulse which propagates through the metal rod generates a stepwise dynamic displacement of the other end face of the rod when reflected there. This dynamic displacement is measured simultaneously by a reference laser interferometer with a reference laser beam and a laser displacement/vibration meter with unknown frequency response characteristics, followed by comparison of measurement data over a frequency range to determine the frequency response characteristics of the unknown laser displacement/vibration meter.

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Bouch et al., "Calibrators for Acceptance and qualification Testing of Vition Measuring Instruments," pp. 1-13, Dec. 1963.
Clark, "An Improved Method for Calibrating Reference Standard Accelerometers", 1970 pp. 103-107.

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