Single-channel millimeter wave encoding imaging device

Abstract

The invention provides a single-channel millimeter wave encoding imaging device, which adopts the processes as follows: a front collecting lens is used for gathering radiation millimeter waves of a target scene; a measurement baffle plate as an encoding template is used, so that the millimeter waves gathered by the front collecting lens are subjected to encoding modulation; an exit slit is used for ensuring that only one signal of the encoding template can pass in each measurement; a back-stage collecting lens is used for gathering an encoding signal emitted from the exit slit; a radiometer antenna is used for receiving the signal emitted from the back-stage collecting lens; a millimeter wave radiometer is used for converting the signal received by the radiometer antenna into an electric signal and transmitting the electric signal to an image collection, reconstruction and control panel module; the image collection, reconstruction and control panel module is used for carrying out decoding imaging and difference value processing on the electric signal to reconstruct a target scene image; a template movement mechanism is used for moving the measurement baffle plate. Reconstruction of the target scene is achieved by utilizing the advantages of high selectivity and high signal-to-noise ratio of encoding measurement; performance optimization of millimeter wave imaging under the premises of not increasing the number of channels and not improving the cost of a system is achieved.

Description

technical field [0001] The invention relates to the technical field of millimeter wave detection and imaging, in particular to a device for realizing target scene reconstruction by using single-channel millimeter wave coding technology. Background technique [0002] Millimeter wave imaging systems are capable of working around the clock. Millimeter-wave imaging is divided into active imaging and passive imaging. Passive millimeter-wave systems do not emit electromagnetic waves, have no electromagnetic pollution, damage or interference to the imaged objects or scenes, and have good concealment, so they are widely used in human security inspections, medical inspections, Illegal drug detection and military covert investigation and other fields. [0003] The passive millimeter-wave imaging system can adopt single-channel (single detector) mode, which has the advantages of simple and reliable system, low cost, but long imaging time and low resolution; multi-detector or antenna a...

AI Technical Summary

Problems solved by technology

[0003] The passive millimeter-wave imaging system can adopt single-channel (single detector) mode, which has the advantages of simple and reliable system, low cost, but long imaging time and low resolution; multi-detector or antenna array mode can also be used, this mode imaging The speed is fast, but the system is complex and bulky, and the imaging quality is limited by the technology and level of millimeter-wave devices (array devices have non-uniformity). At the same time, high-quality millimeter-wave components are expensive, and the cost is much higher than that of single-channel systems. Applications are limited

Wu Shuai et al.'s patent "A Single-Phase Millimeter-Wave Imaging Device and Method" (publication number: CN 103809176A) adopts the compressed sensing method, utilizes the sparsity of the signal, uses a small amount of data, and restores the The original signal can be obtained, but the reconstruction algorithm is more complicated, the implementation is poor, and there are certain difficulties in implementation

At the same time, in the bands from visible light to near-infrared, spatial light modulation technology has been relatively mature, such as digital micromirror array (DMD), etc. In the article "Single-Pixel Imaging via Compressive Sampling" by Marco F. Duarte et al., a visible light However, there are also problems such as complex image reconstruction algorithm, poor implementability, and difficult implementation.

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