Switchable infrared spectrum polarization imaging device and measuring method thereof

Abstract

The embodiment of the invention provides a switchable infrared spectrum polarization imaging device and a measurement method thereof, and the device comprises an infrared imaging front group, a relayimage plane, a collimation imaging lens, a spectrum modulation assembly, a convergence imaging lens and an infrared detector which are sequentially arranged in the optical axis direction of a target light beam. Polarization modulation assemblies are arranged at one side of the infrared imaging front group in the direction perpendicular to the optical axis side by side, and the infrared imaging front group and the polarization modulation assemblies are connected with a switching motor. The device is simple and compact in structure, the optical assemblies can be switched according to user requirements; by switching the different assemblies, infrared radiation intensity information, infrared spectrum information, infrared polarization information or infrared spectrum polarization informationcan be obtained, the detection dimensions are multiple, the information obtaining capability is high, the device is suitable for a novel investigation system with strict requirements for the size andthe weight of sensors, and the requirement for rapid obtaining of multi-dimensional information can be met.

Description

technical field [0001] The invention relates to the technical field of infrared spectrum imaging, in particular to a switchable infrared spectrum polarization imaging device and a measurement method thereof. Background technique [0002] Infrared spectral polarization imaging technology is developed by combining the characteristics of spectral imaging technology and polarization imaging technology. Usually, a polarization imaging system is introduced on the basis of traditional spectral imaging systems to expand the amount of target measurement information from three dimensions (spectrum, light intensity and space) To seven dimensions (spectrum, light intensity, space, polarization degree, polarization angle, polarization ellipticity and rotation direction), it has the incomparable advantages of intensity information, providing an effective answer path for comprehensive and in-depth research on the spectral polarization characteristics of the target . Through the analysis o...

AI Technical Summary

Problems solved by technology

[0005] Among them, the spectral polarization imaging system based on the rotating filter or tunable filter structure can directly obtain the target spectral information, the structure is compact and simple, but the spectral resolution is low

The spectral polarization imaging system based on the space / time interference structure adopts the method of Fourier transform to reconstruct the spectral information of the target. The spectral accuracy is good and the resolution is high, but the system volume and weight are large and the real-time performance is low.

At the same time, although the above two types of typical infrared spectral polarization imaging systems have different spectral separation principles, they usually use the polarization modulation method of the rotating polarization structure. During the measurement, four sets of orientations of the polarizer need to be changed, which is difficult to meet the needs of real-time polarization information acquisition.

Finally, in the field of reconnaissance, some targets may be weak targets (small pixels occupied, weak radiation energy), the introduction of spectral and polarizing devices will further reduce the energy received by the detector, making the target undetectable

Furthermore, some targets only have one kind of spectral feature or polarization feature, and simultaneous acquisition of spectral / polarization information will increase information redundancy and increase the complexity of information processing

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