A terahertz passive color focal plane camera

Abstract

Provided in the invention is a terahertz passive type color focal plane-based camera comprising an antenna feeder module, a terahertz focal plane multichannel coherent receiver module, an intermediate frequency signal processing module, and a local oscillator reference source. The receiver module is located at a focal plane of a reflector antenna of the antenna feeder module; and a terahertz radio frequency signal sent by a detected object is reflected by the reflector antenna and then is focused at the receiver module. The receiver module includes a terahertz multi-beam quasi-optical mixer having N1*N2 pixels; and the received terahertz radio frequency signal and terahertz local oscillator signal are mixed to generate N1*N2 paths of mixing output signals. The intermediate frequency signal processing module carries out processing on the N1*N2 paths of mixing output signals to output N1*N2*W paths of intermediate frequency signals, wherein the W value is consistent with the number of terahertz frequencies of preprocessed detected object radiation waves. According to the invention, the object identification capability in the complex background environment can be improved; and real-time imaging is realized. The resolution ratio and the sensitivity are high.

Description

technical field [0001] The invention relates to the technical field of terahertz imaging, in particular to a terahertz passive color focal plane camera. Background technique [0002] Terahertz (THz) waves usually refer to electromagnetic radiation (1THz=10 12 Hz), which lies between microwaves and infrared radiation on the electromagnetic spectrum. Terahertz wave radiation can have the following characteristics in imaging applications: Terahertz wave radiation can penetrate many common non-metallic covering materials and detect hidden objects; the wavelength of terahertz wave is short enough to obtain higher imaging spatial resolution , or to achieve high-precision positioning of dangerous objects; electromagnetic radiation at terahertz frequencies is non-ionizing to organisms, so it is safer for the human body when used at an appropriate intensity; compared with microwave and millimeter wave imaging systems, under the same image resolution, Terahertz imaging systems are s...

AI Technical Summary

Problems solved by technology

Using a single terahertz frequency, although the target can be effectively found and imaged, due to the complexity of the target radiation characteristics, there are problems in the effective target radiation intensity or feature recognition

[0005] 2. Usually a single-pixel scanning structure is used, which cannot be imaged in real time, and the resolution needs to be improved

If the direct detection method is used, although the focal plane imaging of a large-scale array can be easily realized, the sensitivity is low and the phase information is missing; if the heterodyne reception method is used, each channel needs a local oscillator signal, so the intermediate frequency circuit is complicated And bulky, not suitable for portable use

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