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Atmospheric correction unit for the laser interferometer

By Stanislav Kučera

Abstract

This work deals with design, realization and testing the device for suppression the effect of the fluctuation of the atmospheric conditions on the laser interferometer measurement. Parasitic and randomly changes of atmospheric conditions – temperature, pressure, relative humidity and chemical composition of the air changes his refractive index, then wavelength of the laser light in this environment. Physical properties of air are measured by ultraprecision sensors. The actual wavelength is periodically calculated from Edlén formula. The device is processing the quadrature output signals from receiver of the homodyne interferometer include the atmospheric correction in real time. The device is equipped with interface to data acquisition into the personal computer

Topics: Laser interferometer; FPGA; Edlénovy rovnice; fluctuation; Edlén equation; homodynní detekce; Laserový interferometr; refractive index of air; fluktuace; index lomu vzduchu; CORDIC algorithm; CORDIC algoritmy; USB.; kvadraturní signály; quadrature signals; homodyne detection
Publisher: Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií
Year: 2012
OAI identifier: oai:invenio.nusl.cz:243209
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