1. A. K. Nigam, K. J. Taylor and G. M. Sessler, in “Acoustical Holography, Vol. IV,” Springer Science+Business Media New York (1972) p. 173;
2. A. K. Nigam and G. M. Sessler, Appl. Phys. Letters 21, 229 (1972).
3. P. Alais, in “Acoustical Holography, Vol. IV,” Springer Science+Business Media New York (1972) p. 237.
4. An assessment of the complexity of interconnections for the N2 array is provided in References 1 and 20. See also M. G. Maginness, J. D. Plummer and J. D. Meindl, this volume.
5. Another drawback of the 2N array appears to be higher interelement crosstalk due to residual sensitivity of elements. The results of references 1 and 2 above, indicate that this drawback is eliminated by suitable choice of foil-material having the appropriate bulkresistivity and/or by applying opposite polarity biasvoltages during alternate scanning frames.