Abstract: An optoelectronic code-to-position encoder intended for measuring linear and angular travels of an object contains a coordinate scale with raster and code tracks, a readout unit, which includes a lighter, a raster analyzing mask, light detectors of the raster track and a multi-element light detector of the code track. The readout unit is fitted with a code analyzing mask, which is composed of two arrays of windows and optically conjugated with the code track of the coordinate scale; the multi-element light detector of the code track is made as two separate arrays of light detectors and is located behind the code analyzing mask. The inventive device makes it possible to eliminate a coordinate code readout ambiguity on a static initial position of a measured object and simultaneously increase the running speed, reduce the dimensions and increase the potential accuracy of the encoder.

Abstract: The pump comprises a housing (1) in which are installed with a radial clearance an axial-flow suction wheel (5) and an axial-flow impeller wheel (6), which wheels are mounted on a common drive shaft (4) one after the other in the direction of flow. The inside diameter of the pump housing (1) in the zone of the suction wheel (5) decreases in the direction of flow. The inside diameter of the pump housing at the entry to the suction wheel (5) is calculated from the formula:D.sub.o =D.sub.1 .multidot.K.sub.1 (C.sub.k .multidot.10.sup.-4 +2.1).sup.2The suction wheel (5) comprises a hub (11) with helical vanes (12) attached thereto. The vane setting angle increases in the direction of flow and at the entry to the suction wheel (5) it is:.beta..sub.o =(10 to 33.DELTA./D.sub.1).degree..+-.1.5,whereD.sub.o --inside diameter of the pump housing 1 at the entry to the suction wheel 5;D.sub.1 --inside diameter of the pump housing 1 at the entry to the impeller wheel 6;K.sub.1 --dimensionless coefficient of 0.17 to 0.13;C.

Abstract: A semiconductor photoelectric generator, for converting radiation energy from a source, for example, the sun, into electric energy, comprises a matrix of photo electric converters made of a semiconductor material. Each photoelectric converter is doped to form a P-N junction and an isotype junction. Current-collecting conductors are connected to a base region and to an alloy region. An operating surface of the semiconductor photoelectric generator is secured by a translucent adhesive layer to a coating exposed directly to radiation from a radiation source. The coating is composed of optical concentrators which focus the radiation energy in a focal spot and are disposed on the operating surface so that the absorption band of the focussed radiation in the focal spot is located in the base region and is spaced from the P-N junction by a distance not exceeding the diffusion length of the minority carriers in the base region.