Portable terahertz semi-active color camera

Abstract

The invention provides a portable terahertz semi-active color focal plane camera which comprises a local oscillator reference source, a terahertz multi-beam quasi-optical mixer and W terahertz irradiation source modules, W being the number of pre-obtained colours, and W being a natural number which is equal to or larger than 1. Each terahertz irradiation source module sends terahertz irradiation signals for irradiating on a detected target. Each terahertz irradiation source module comprises a terahertz irradiation signal frequency multiplier and a terahertz antenna. Local oscillator signals generated by the local oscillator reference source are subjected to frequency multiplication through the terahertz irradiation signal frequency multiplier, radiated by the terahertz antenna, and then, irradiates on the detected target. The camera in the invention is small in size, light in weight; capable of improving target identification capability in a complex background environment, excellent in anti-disturbance performance, capable of real-time imaging, and has good resolution and sensitivity.

Description

technical field [0001] The invention relates to the technical field of terahertz imaging, in particular to a portable terahertz semi-active color 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 ...

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

[0006] 3. 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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