Techonlogy of Ultrasonic Control of the Well-Bonded Pipe Coupling Space Filling

The method of well-bonded pipe coupling space filling control by means of ultrasonic NDT methods has been proposed. Use of ultrasonic NDT method for coupling space filling with self-hardening substance (both compound and molten metal coupling space filling) has been analyzed. Taking into consideration the high temperature of the repair structure during repair works performance when using a molten metal, which is determined by high temperature, the application of piezo-electric transducers is ineffective.

Method for Assessing Modulation Transfer Function of Trifocal Intraocular Lens

The article investigates the quality of images formed by multifocal optical elements. The method for calculating of multifocal diffractive lens modulation transfer function (MTF) at presence of background is proposed. The method is based on a geometric calculation of the intensity of background images and the diffraction efficiency of the main image in each focal plane is considerated. The article has studied the contrast of main images formed by trifocal intraocular lens (IOL).