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Phase deviation compensation method for large-scale array photon-assisted millimeter wave imager
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DOI：10.1016/j.optlastec.2025.113791.png)
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Abstract
En 中文
The photon-assisted millimeter wave imager converts the microwave aperture to an optical aperture via high-fidelity up-conversion, enabling parallel beam processing in spatial optics and drastically reducing data volume and power consumption. However, precise phase control across massive arrays becomes challenging with increasing channel counts. We propose a phase deviation compensation method to mitigate phase deviations introduced by inter-channel delay inconsistency and near-field wavefront difference. By integrating the array element configuration, we predict the density and orientation of interference fringes formed between the reference and compensated channels, leveraging this prior information to enhance compensation efficiency. A polynomial-based grayscale fitting is performed along the fringe normal direction, enabling sub-pixel precision extraction and real-time compensation of channel-induced phase deviations. A detection-range-indexed phase compensation dataset is constructed to enable seamless focusing imaging across near-field to far-field transitions. Experimental validation on large-scale receiving arrays demonstrates phase compensation accuracy exceeding 2.5° across channels. The diffraction efficiency of post-compensation near-field-to-far-field imaging exceeds 23 %, and with further amplitude correction, it can be optimized to 28.1 %. This method enables high-quality auto-focusing in millimeter wave imagers.
Keywords:
photon-assisted imaging
phase deviation compensation
millimeter wave imager
fringe pattern analysis
sub-pixel precision
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