FIELD: instrumentation.
SUBSTANCE: coherent light flux and movable periodic structure are produced in transparent medium located in displacement plane. Light flux is directed to transparent medium with movable periodic structure at preset angle selected subject to diffraction with the help of nonzero diffraction order formed by moving periodic structure. Measuring flux is formed. Reference flux is formed so that algebraic difference between reference and measuring fluxes aligned in the plane of periodic structure motion is proportional to periodic structure frequency. Said two fluxes are aligned in space. Then, interfering fluxes are converted into electric signal while periodic structure being looped with delayed feedback. Note here that light flux and moving periodic structure in transparent medium are formed in synchronous pulse medium. Parameters of pulse mode synchronisation are varied owing to control over time delay in feedback. Electric signal phase variations caused by displacements are compensated. Shifts in axis associated with periodic structure motion is defined by time delay.
EFFECT: higher precision of measurements, enhanced performances and higher resolution.
3 dwg
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