Controlled effects of aliasing synthetic Fresnel holograms with pixel phase error function

The paper proposes a design scheme of movement encoder with low cost and high performance. The scheme can provide higher precise rotor position signal for motor by a hall-effect latch and a linear hall-effect sensor, and it can also provide rotational speed and direction of motor by a winding with full pole distance, at last we deduce a torque balance equation based on speed and acceleration of motor. The study shows that the scheme with low cost have much higher position precision than traditional rotational transformer and hall-effect position sensor, and it does not exist amplitude error and phase error, function error is small. It is very worthy to the wide application of motor of electric bicycle, wind-driven generator, electric car, and servomotor, etc.

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Characterization of aliased fresnel hologram by pixel phase error function

17th Congress of the International Commission for Optics: Optics for Science and New Technology ◽

10.1117/12.2298917 ◽

1996 ◽

Author(s):

Raimo Silvennoinen

Keyword(s):

Error Function ◽

Phase Error ◽

Fresnel Hologram

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Characterization of Fresnel holograms by a pixel phase-error function

Optics Letters ◽

10.1364/ol.21.000513 ◽

1996 ◽

Vol 21 (7) ◽

pp. 513 ◽

Cited By ~ 1

Author(s):

Raimo Silvennoinen ◽

Jari Räsänen ◽

Marko Honkanen

Keyword(s):

Error Function ◽

Phase Error

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Simulation of synthetic Fresnel hologram with pixel phase error function

Journal of Optics ◽

10.1088/0150-536x/27/2/003 ◽

1996 ◽

Vol 27 (2) ◽

pp. 71-79 ◽

Cited By ~ 1

Author(s):

R Silvennoinen ◽

J Uozumi ◽

T Asakura

Keyword(s):

Error Function ◽

Phase Error ◽

Fresnel Hologram

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Verification of Phase Shifter Measurements of a Reflective Array Antenna

Journal of the Russian Universities Radioelectronics ◽

10.32603/1993-8985-2021-24-2-18-26 ◽

2021 ◽

Vol 24 (2) ◽

pp. 18-26

Author(s):

M. D. Parnes

Keyword(s):

Measurement Error ◽

Radiation Pattern ◽

Antenna Arrays ◽

Measurement Errors ◽

Phase Shifter ◽

Error Function ◽

Phase Error ◽

Optical Excitation ◽

Phase Shifters ◽

Reference Plane

Introduction. Large-size phased antenna arrays (PAA) frequently incorporate optical excitation schemes, whose main elements include the feed and the reflective aperture. In turn, the reflective aperture consists of several tens of thousands of radiators and phase shifters. Major distortions of the radiation pattern in reflective arrays occur due to phase errors, leading to a decrease in the gain and an increase in the side lobes of the radiation pattern. In the millimeter wavelength range, ferrite phase shifters can have an initial phase from 0 to 360 °, thus requiring measurements of the array elements following their assembly.Aim. To develop a method for evaluating errors in measurements of the parameters of phase shifters incorporated in an antenna array by comparing theoretical and experimental data.Materials and methods. A convenient method for determining the parameters of phase shifters is probing, in which a movable probe is connected in series with each array element. In cases where a PAA element represents a single structure consisting of a ferrite segment and a dielectric radiator, measurements are carried out using a probe in the form of a segment of a round waveguide moving towards the radiator. In order to evaluate the measurement error of such a scheme, a mechanically controlled reference phase shifter was used.Results. Measurement errors for the probe structure used were calculated based on the assumption of the phase error arising from the vector addition of the controlled and uncontrolled reflected signals at the input of the PAA element, in the section of the reference plane at the input of the probe. In addition, the S-parameters of the superposition section were calculated. The extrema of the error function were used to determine the maximum errors in measuring the phase and amplitude.Conclusion. The performed analysis confirmed the validity of the proposed method for measuring the parameters of phase shifters using a waveguide probe. The measurement error of the PAA elements according to the proposed scheme was found to be about 3 o, which is commensurate with that of recording devices.

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