DIRECTMEASURING PHASE METHOD OF SMALL DISTANCES MEASUREMENT BY THE OPTOELECTRONIC SENSOR IN DYNAMIC CONDITIONS
Journal Title: Сенсорна електроніка і мікросистемні технології - Year 2015, Vol 12, Issue 4
Abstract
Statement of a task The work is devoted to development and researches of a method the small distances precision contactless measurement for creation of the optoelectronic sensor working in dynamic conditions. Technique of researches At realization of calculations the computer facilities and the software of a high level is used, physical and computer methods with a mathematical equipment are used. For precision remote measurements on short routes the advantage is given to optical-location systems with continuous radiation in which time measurements carried out by an indirect method, by use of phase relationship of the direct and reflected beam. For measurement of small distances in dynamic conditions the modified method of location measurements which allows to improve the operative signal processing in a wide dynamic range and to expand the opportunities of known optical methods of ranging is developed. The functioning algorithm and the block diagram directmeasuring phase method of distance measurement is developed, conditions for phase difference measurement on low intermediate frequency which provide high accuracy of measurements are created. Discussions of results Increase of small distances measurements accuracy is connected to reduction of probing pulses duration and increase of radiation capacity. To achieve the given level of accuracy it is possible in megacycle frequency range which forms high requirements to quick-action of the sensor optoelectronic block elements. Use of pin-structures has allowed to reduce photo diodes time constant up to several nanoseconds, that is equivalent to passband width of the order of gigahertz with simultaneous reduction of initial capacity. The choice of a photodetector is determined by its spectral sensitivity and an opportunity simultaneously with the optical system to solve tasks of an optimum spectral filtration at signal extraction on a background of nuisance. Capacity of a laser radiator is regulated by necessity of influence of object surface reflecting properties elimination. Conclusions The carried out calculation for the minimal measured distance of 0,3 m and the appropriate measurement accuracy has shown, that absolute dynamic accuracy of measurement of in-line distance in all range of distances will be not worse than 3 mm.
Authors and Affiliations
Ya. I. Lepikh, V. I. Santoniy, V. V. Janko, L. M. Budiyanska, I. A. Ivanchenko
Keywords
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- EP ID EP399297
- DOI 10.18524/1815-7459.2015.4.107791
- Views 47
- Downloads 0
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