The videogrammetry method is an improvement of a traditional photogrammetry method realized with the help of modern means of videoengineering, digital registration and image processing. The goal of the method is to restore the three- dimensional coordinates of a required point of an object under test on base of two coordinates of center of the point's image at the registration plane. One of the ways to resolve the arising uncertainty of restoration is to use of a structured illuminating beam of light rays; the known geometry of the beam helps to obtain the missing information. The special cases of such a beam are a light sheet and a beam of the parallel or radial light rays. The methods of videogrammetry with a laser light sheet and with a beam of radial light rays are both simultaneously applied in the measuring system to check the geometrical parameters of railway wheels which has been placed in operation on the industrial conveyor at Vyksunsky steel works. The measuring system uses three videogrammetric channels. Two of them are apply the laser light sheet scheme. These channels have identical features and are intended for measurements of geometry of the radial section fragments of the internal and external disk surfaces of the wheel. The channels have a measurement range of 500 X 500 mm. The measurement tolerance of each of the two coordinates do not exceed 0.15 mm. The third channel is constructed under a shadowgraphic scheme on base of a light beam of radial rays and provides the measurements of the wheel rolling surface geometry. This channel has a measurement range of 120 X 180 mm and measurement tolerance of 0.05 mm. The measuring system works in real time with the conveyor. A wheel tolerance check cycle, which takes 45 seconds includes lifting the wheel to the measurement position, rotating the wheel one full revolution with simultaneous measurement of a given number (up to 12) of radial sections, lowering the wheel to the conveyor line, processing and displaying the measurement results.
Helicopter's blade during its rotation accomplishes a complex spatial movement and deformation. This report is devoted to Blade Deformation Measuring System (BDMS) which was developed to measure parameters of the real-scaled blade movement and its bending-twisting deformation. This system operates under videogrammetry principles. The basic principles of registration of video-images and processing of results of measurements are stated. Brief description of the system design is given. The results of the laboratory investigations of system features are discussed as well. This system was tested during experimental investigations of blade deformations of the real upper rotor of Kamov-26 helicopter with radius 6.5 m on the VP-5 rotor test facility in TsAGI's T-101 wind tunnel. The tests have confirmed serviceability of system and have shown opportunity of twist deformation measurements of the blade with a root-mean-square error lower 3 - 6 angular minutes and bend deformations measurements with an error of 0.3 - 0.6 mm. The technique of calibration of Blade Deformation Measurement System and appropriate software had been developed and tested.
Luminescent Pressure Sensor Technology is a new optical pressure measurement method providing new opportunities for non-contact pressure measurements, for example on the blades of rotating propellers. Specific features of LPS-technology for propellers are discussed. A prototype optical pressure measurement system for propellers and operational procedure are described. Results of pressure measurements on two propellers at zero and non-zero angles of attack are presented.