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Solution method and apparatus for spectrum non-uniformity in same image of AOTF

A solution, spectral technology, applied in the field of AOTF spectral imaging, can solve problems such as image spectral inhomogeneity, achieve the effect of reducing the average error and improving the accuracy of spectral measurement

Inactive Publication Date: 2015-12-09
ZHONGBEI UNIV
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Problems solved by technology

[0004] In order to overcome the problem of uneven spectrum in the same picture in AOTF imaging in the prior art, the present invention provides a method of correcting the spectrum by quadratic fitting, thereby improving the measurement accuracy of the AOTF spectrum

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  • Solution method and apparatus for spectrum non-uniformity in same image of AOTF

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Embodiment Construction

[0032] The following embodiments will further describe the present invention in conjunction with the accompanying drawings.

[0033] Such as figure 1 As shown, a device for solving spectral inhomogeneity in the same picture of AOTF includes a front optical system 1, a first polarizer 2, a diaphragm 3, AOTF4, a second polarizer 5, an imaging lens 6, a CCD 7 and a computer 8 , the pre-optical system 1 is composed of the first lens 9, the second lens 10 and the third lens 11, and the light of the measured object in the distance passes through the pre-optical system 1, the first polarizer 2 and the aperture 3 in sequence, and then enters the AOTF4 for diffraction The light is filtered, passed through the second polarizer 5, imaged on the CCD7 through the imaging lens 6, and finally the spectrum is corrected by the computer 8.

[0034] The front optical system 1 is to compress the incident angle of the light of the distant target to be within the field angle range allowed by AOTF4...

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Abstract

The invention relates to the technical field of AOTF spectrum imaging, and more specifically relates to a solution method and an apparatus for spectrum non-uniformity in the same image of an AOTF. The solution method is mainly used for solving spectrum non-uniformity of the same image in the imaging of the AOTF and is a method for realizing spectrum correction via subsequent data processing, and the central wavelength of AOTF diffraction corresponding to a pixel xi in the x direction of any CCD with any driving frequency f is obtained via a formula shown in the description. The solution method and the apparatus are mainly applied to spectrum imaging of the AOTF, compared with the conventional AOTF imaging spectrum, the average error of the spectrum in the same image can reduce one order of magnitude, and the spectrum measuring precision of the AOTF is obviously improved.

Description

technical field [0001] The present invention relates to the technical field of AOTF spectral imaging, and more specifically, relates to a method and device for solving spectral inhomogeneity in the same AOTF image, which is mainly used to solve the spectral inhomogeneity in the same image in AOTF imaging. Subsequent data processing implements a method for spectral correction. Background technique [0002] Acousto-optic tunable filter (AOTF) has the advantages of small size, fast tuning speed, wide spectral range and high diffraction efficiency. AOTF-based imaging spectrometers have found applications in remote sensing, environmental monitoring, biomedicine, and food testing. [0003] The accuracy of spectral measurement in AOTF plays a key role in the quality of spectral imaging. In actual research, for the AOTF imaging spectrum, when the light is vertically incident on the AOTF, a certain driving frequency corresponds to a certain fixed wavelength. However, it is impossi...

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Application Information

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IPC IPC(8): G01J3/28G01N21/01
Inventor 张瑞王志斌薛鹏李克武陈媛媛张敏娟李晋华王耀利
Owner ZHONGBEI UNIV