Millimeter Wave Imaging Using Up-Conversion Detection Method with Glow Discharge Detector and Photoreceiver Combination

This paper presents an advanced photonic detection system for high-resolution millimeter-wave (MMW) imaging, utilizing an up-conversion detection method with a Glow Discharge Detector (GDD) and a photoreceiver to capture detailed images of metallic objects. The system employs a 105 GHz MMW beam, generated by a custom transmitter, which illuminates the object. Reflected MMW radiation is collected by a large spherical mirror and directed to the GDD, where the MMW signal is up converted to an optical signal. The GDD’s response to MMW incidence produces a measurable increase in light intensity, detected by a lownoise photoreceiver equipped with a Si-PIN photodiode, enhancing the sensitivity and accuracy of the detection process. The GDD-photoreceiver assembly is mounted on motorized linear stages, enabling precise vertical and horizontal scanning in patterns, which facilitate the creation of grayscale MMW images. Data acquisition is conducted through a dedicated platform that translates the detected signals into clear, highquality images. This system showcases significant advancements in photonic detection for MMW imaging, offering enhanced resolution and sensitivity, which are advantageous for a range of applications.