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Abstract
Measurement of the electroacoustic characteristics of lead metaniobate and lithium sulfate as volume expanders in the frequency range 100 cps to 3 kc is described. Two identical stacks of crystals are placed in a small chamber at the same time. The measurement technique is based on the assumption that the change is acoustic impedance of the pressure chamber with with hydrostatic pressure is known, and that consequently any changes in the characteristics of two like crystals, one receiving, the other transmitting, can be determined by measuring the change in the output as a function of pressure. Also, if the electrical impedance of the crystals do not change, then, by reciprocity, any change in the sensitivity of the crystals would multiply the change in the receiver by the change in the transmitter. The possibility of compensating errors is therefore eliminated. Changes in response characteristics measured under pressure by this method are less than ±0.5 db.
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