Vector tensor theory results' have been applied to optimization of selfdiffraction phenomena in photorefractive crystals of symmetry 23 . The .giant diffraction efficiency of 77 % in doped and radiated BTO crystal is observed. The signal to noise ratio was 600. Optimization algorithm for improving this ratio is proposed. These results are applied to small size sensors for some engineering applications.

A new single-beam technique for a continuous reconstruction of volume holograms in photorefractive crystals of symmetry 23 is presented. The doped crystal Bi12TiO2o (Fe, P) possessing diffraction efficiency above 70 % is used for real-time holographic interferometry. The major advantage of this technique is an automatic self-adjustment of diffraction in volume holograms, continuous reconstruction of volume holograms, high difiuaction efficiency without application of external electric field, high resolution (more than 3000 lines/mm), high vibroprotection stability, low cost using of He-Ne or diode lasers, portability (single-beam device). A 1 mm crack was detected at a depth 1 .5mm in airplane wings near a rivet zone using portable adaptive holographic interferometer -A}ll.

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The giant volume grating diffraction efficiency of 70 % in triple doped photorefractive crystal sillenite family has been observed. Measured signal to noise ratio is more than 250 in continuous hologram registration regime. A high quality interferograms of diffusely scattered objects have been obtained. These results were applied for construction a new adaptive portable sensors for engineering applications.