Apparatus and method for calibration of sensing transducers

Details Apparatus and method for calibration of sensing transducers Apparatus and method for calibration of sensing transducers

1996-07-16

1997-07-01

Raevis, Robert

Measuring and testing

Instrument proving or calibrating

Speed, velocity, or acceleration

73 141, G01L 2500

Patent

active

056440677

ABSTRACT:
Reciprocity calibration of electromechanical transducers is carried out with three transducers, which are secured to a mass mounted for oscillation as a pendulum. A first transducer is driven and the electrical output of a second transducer is measured. A third transducer, which must be a linear, reciprocal device, is driven and the electrical output of the second transducer is measured. The first transducer is driven while the electrical output of the third transducer is measured. The sensitivities of the transducers can be deduced from the electrical inputs and the measured electrical outputs by taking advantage of reciprocity. The transducers may be mounted to the pendulum mass two at a time, or alternatively, all three transducers may be fixed to the pendulum mass.

REFERENCES:
patent: 5203199 (1993-04-01), Henderson et al.
"Shock and Vibration Handbook" Third Edition, McGraw-Hill, 19, Ch. 18, pp. 6-18, 34-35.
H.M. Trent, "The Absolute Calibration of Electro-Mechanical Pickups", Journal of Applied Mechanics, 1948, pp. 49-52.
Sanford P. Thompson, "Reciprocity Calibration of Primary Vibration Standards", The Journal of the Acoustical Society of America, Sep. 1948, pp. 384-389.
Mark Harrison et al, "The Reciprocity Calibration of Piezoelectic Accelerometers", The Journal of the Accoustical Society of America, Jul. 1952, pp. 637-640.

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