Abstract: A method of non-destructive quality inspection of materials wherein a data transmitter and a material to be inspected are positioned very near to each other and set in motion in relation to each other. Information fed by the data transmitter is converted into a black-white or color image indicative of the quality of the material being inspected. Information fed by the data transmitter is kept in a memory and, as it is converted into a black-and-white or color image, it is periodically read out. The address of a memory location in the memory from which the readout cycle is to begin is assigned prior to the start of each readout cycle. A videomonitor realizing this method including a data transmitter mounted on a scanning device, a display unit connected to a control unit and an address unit including a recording counter series connected to a switch, as well as a readout counter connected to another input of the switch.

Abstract: A variable-ratio transformer for arc and plasma setups, comprising a magnetic core made up of a main part composed of two yokes and legs in accordance with the number of phases and an additional part disposed on the side of the yoke of the main part of the magnetic core. The additional part of the magnetic core is made up of a yoke and legs whose number is equal to the number of the legs of the main part, at least one leg being placed with a gap in relation to the first yoke of the main part. The primary winding of each phase comprises two series-connected parts, the first part being located on the main part of the magnetic core, while the second part is located on the additional part thereof. A controlled electronic switch which regulates the load current flowing through the secondary winding of each phase, disposed on the main part of the magnetic core, is connected in parallel to one of the parts of the primary winding of each phase.

Abstract: The proposed transformer control device is based on the magnetization principle and includes a voltage comparator unit, intermediate amplifiers and power amplifiers. The introduction of an additional intermediate amplifier and the connection of the inputs of the intermediate amplifiers in series opposition makes it possible to separately magnetize each yoke of the transformer. The separate magnetization of the transformer yokes instead of their differential magnetization substantially reduces the no-load current of the transformer, brings down the mean power required to control the magnetization of the yokes in the continuous voltage adjustment range, and thus raises the transformer's efficiency.

Abstract: According to the invention, the voltage regulation and stabilization device comprises a transformer with magnetized yokes; a switch of power winding taps of the transformer; and a control circuit incorporating a comparison unit, an intermediate amplifier, a differential power amplifier, voltage regulation margin measuring units, an electronic commutator, and a power supply for the control circuit units. The device of this invention makes it possible to expand the range of continuous voltage regulation, while maintaining a high power factor and reducing the consumption of active materials.