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In telecommunications and radar, a planar array is an antenna in which all of the elements, both active and parasitic, are in one plane. A planar array provides a large aperture and may be used for directional beam control by varying the relative phase of each element. A planar array may be used with a reflecting screen behind the active plane. A planar array with a reflecting screen is related to a radar absorber. Both are supposed not to reflect incoming radiation of the desired wavelength. Radar absorbers have the advantage that they can use magnetic materials to avoid reflections at the interface to air at least for some frequencies. For antennas to be broadband, the transition from air to the metal of the screen has to be a gradual one. Radar absorbers have the advantage that they do not have to collect the received energy. The antenna needs a 3D tree of twin-leads and chokes to connect a single cable to a large number of micro antennas. Micro dipole antennas are only resonant at a single high frequency, to be broadband the arms of adjoining antennas have to be connected.

Three-dimensional shape measuring system of fringe projection based on sine phase modulation four-step integral

InactiveCN103983211AEliminate Phase DriftMeet contactlessUsing optical meansMathematical modelCarrier signal

The invention discloses a three-dimensional shape measuring system of fringe projection based on a sine phase modulation four-step integral, and relates to the field of three-dimensional shape measuring. The method includes the steps that an optical fiber interference fringe projection mathematical model is built; a phase error compensation system extracts phase drift amount caused by environment factors, and phase compensation voltage is generated and is injected into a dual-channel piezoelectric ceramic driver; a sine phase modulation signal is directly injected into the dual-channel piezoelectric ceramic driver to achieve sine modulation of a fringe phase, injected into the phase error compensation system to serve as a phase generation carrier and injected into a CCD time sequence controller to serve as a reference signal of the CCD time sequence controller, a time sequence generated by the CCD time sequence controller controls a planar array CCD camera to collect a fringe image on the surface of an object to be measured, the image is uploaded to an image processing and shape restoring system, and finally surface shape reconstruction of the object is achieved. The method meets the technical requirements for non-contact, full view, quickness, high precision and the like of multiple application fields.

Three-dimensional shape measuring system of fringe projection based on sine phase modulation four-step integral

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Owner:TIANJIN UNIV

1 results about "Planar array" patented technology

Three-dimensional shape measuring system of fringe projection based on sine phase modulation four-step integral

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