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Multispectral scanner is designed for acquisition of the multispectral spatially matched quantitative information on both reflectance and emittance of the on-ground objects. Mechanical scanning is used. Six spectral channels are operable in the range of 0.4 -12.5 tm. All the channels are provided with the removable sets including four optical filters for each channel. Switching or change of the filters can be performed by the remote control unit. The channels are designed to match spectral ranges that are similar to those which can be found in space sensors for TM-84, ETM, SPOT, NOAA. The digitized field of view is 51.2°. The instantaneous field of view for each channel is 5 minutes. The precision of optical matching for all the channels is no worse than 1/3 of pixel. The selectable scan rates are 1 8, 36, and 72 scans per second. In the channels of the range 0.43 -0.9 jim the multispectral scanner ensures the values of signal/noise ratios 80 -200; within the range of 1 .5 -2.5 xm signal/noise ratios is no less than 100, and within the range of 8 -I2.5 jim no less than 25.

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Polypropylene is one of the most popular thermoplastic materials used in industry. To produce goods from this material, the ultrasonic welding method is often used. However, despite a large number of scientific papers, the influence of some parameters of the ultrasonic welding mode on the strength characteristics of polypropylene joints remains unstudied. The paper presents the results of experimental studies of contact spot ultrasonic welding of plates 3 mm thick made of 01003-26 grade polypropylene. The authors considered the process of gradual penetration of the ultrasonic tool working face into polypropylene to a depth equal to the total thickness of the welded plates. Statistical dependences of the depth of the tool face penetration into the material and the force of material separation on the ultrasound exposure time are obtained. The influence of the depth of the ultrasonic tool working face penetration on the tearing force of welded specimens is determined. A significant increase in the tearing force from 150 to 400 N was found at the tool penetration depth of more than 3.5 mm due to an increase in the nominal area of mutual mixing of the material between the welded plates caused by the flow of molten material into the gap. The authors proposed a hypothesis about the flow of the molten material in the direction opposite to the direction of penetration of the working tool by forming traveling Rayleigh waves. However, its confirmation requires additional studies of the influence of the ultrasonic welding mode parameters and the size of the gap between the parts to be joined on the rate of the molten material flow into the gap.