Device and method of space heterodyning interference hyper spectrum imaging

Abstract

The invention provides a device and a method of space heterodyning interference hyper spectrum imaging. The device comprises a pre-positioned objective lens, a slit, a collimator objective, a grating type Michelson interference system, a post-positioned imaging system and a signal processing system, wherein the pre-positioned objective lens, the slit, the collimator objective, the grating type Michelson interference system, the post-positioned imaging system and the signal processing system are arranged in sequence along the light path direction. Target incident light passes through the pre-positioned objective lens and forms an image at the slit. Emergent light passes through the collimator objective and enters the grating type Michelson interference system and is divided into two interferential plane waves to form interference fringes. Light passes through an imaging objective lens and a cylindrical mirror in sequence, an image carrying one-dimensional space information and interference information is obtained on a detector target surface, and light intensity information of a two-dimensional scene and interference information of each row by scanning a target. The signal processing system extracts interference data under different optical path differences, and Fourier transformation is carried out to obtain target spectrum information and two-dimensional image information of each spectrum section. By means of the device and the method of the space heterodyning interference hyper spectrum imaging, spectral resolution of an existing interference spectrum imaging device can be improved, and sub-nanometer-level face detection with hyper spectral resolution can be carried out.

Description

technical field [0001] The invention relates to an optical target detection method, in particular to a spatial heterodyne interference hyperspectral imaging device and method. Background technique [0002] Imaging spectroscopy technology uses a combination of radiation imaging technology and spectral measurement technology to obtain the two-dimensional spatial radiation intensity information of the target and the spectral information of each point of the target. In the fields of air pollution detection and rocket exhaust temperature measurement, it is necessary to perform sub-nanometer hyperspectral imaging detection on targets. The existing hyperspectral imaging technology is mainly divided into dispersion type and interference type according to the way of light separation. The dispersive scheme needs to use slits for push-broom imaging, and the use of slits makes there is a restrictive relationship between spatial resolution and luminous flux. In order to obtain high spa...

AI Technical Summary

Problems solved by technology

However, there are several problems in this method for imaging detection: (1) Limited by the dispersion characteristics of the prism, in the obtained spectral information, the spectral resolution at the long-wavelength band is much smaller than that at the short-wavelength band, so It is selective to the detection band; (2) This method can only improve the spectral resolution by changing the material and thickness of the dispersion prism, so in practical applications it may not be possible to select a suitable material, or it may require a large Only the volume dispersion prism can achieve the expected spectral resolution; (3) Since the introduction of the dispersion prism will affect the imaging quality of the instrument, it is necessary to design a complex imaging objective optical structure to correct the lack of imaging quality

Compared with traditional interferometric imaging spectroscopy technology, spatial heterodyne spectroscopy technology has the ability to obtain ultra-high resolution spectra in a smaller band range, and has been applied in astronomical exploration, atmospheric remote sensing and other technical fields, but the existing spatial heterodyne spectroscopy The technology assumes that the detection target has a uniform and uniform spectral distribution, so it is mainly used for single-point target imaging detection, and imaging spectrum detection has not yet been realized, which limits the application field of this technology

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