An expanded uncertainty with coverage factor 2 of a new developed arrangement for free-field calibration of 12.7mm standard microphones by the reciprocity technique is better than 0.2dB with frequency range 2kHz to 40kHz.
The another method for the reciprocity calibration of three piezoelectric Accelerometers through six experiments are also made, which calibration error is about ±5.3%, and may be used over frequency from 1 kHz to 5 kHz.
According to reciprocity principle, when adjusting the delay time of neighboring element of a receiver array and stacking the shifting signals of different elements, the received stacking energy can also be maximal in certain direction when waveforms satisfy in-phase stacking.
Consistent results are obtained by using both the methods. The calculation indicates that the reciprocity method is useful for the acceleration of Monte Carlo calculation, and hence will help very considerably raise the efficiency of the Monte Carlo method.
计算实践表明 ,倒易方法有助于加速 Monte Carlo方法的计算 ,从而大大提高了 Monte Carlo方法的效率