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Spectral resolution enhancement method based on Fabry-Perot cavity scanning filtering

A technology of spectral resolution and scanning filtering, which is applied in the field of improving the resolution of grating spectrometers based on Fabry-Perot cavity scanning filtering. Improve the resolution and other issues to achieve the effect of improving comprehensive performance, resolution improvement, and hyperspectral resolution

Inactive Publication Date: 2013-09-18
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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Problems solved by technology

However, this filter is proposed for the application of wavelength division multiplexing in optical fiber communication. It mainly solves the problem of narrow free spectral range of the traditional Fabry-Perot filter, and does not involve the detection and collection of spectra, let alone Mention the improvement in spectral resolution

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  • Spectral resolution enhancement method based on Fabry-Perot cavity scanning filtering
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  • Spectral resolution enhancement method based on Fabry-Perot cavity scanning filtering

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Embodiment Construction

[0032]The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. But the following examples are only limited to explain the present invention, and the protection scope of the present invention should include the whole content of claim, and promptly can realize the whole content of claim of the present invention to those skilled in the art through following embodiment.

[0033] Embodiment 1 of the present invention is a method for improving the resolution of a grating spectrometer with a free spectral range of 800 nm to 1000 nm. like figure 1 As shown, the grating spectrometer is composed of a slit 2 , a collimating objective lens 3 , a transmission grating 5 , an imaging objective lens 6 and a detector 7 . The signal light to be measured is introduced into the grating spectrometer by the fiber 1 with a core diameter of 200 μm and a numerical aperture of 0.22. The width of the slit 2 is 50 μm. After being co...

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Abstract

The invention provides a spectral resolution enhancement method based on Fabry-Perot cavity scanning filtering. A Fabry-Perot cavity scanning filter is added to a grating spectrometer optical path, the length of the cavity of the filter can be modulated, and the modulation range is half of the maximum wavelength of signal light to be detected; when the Fabry-Perot cavity scanning filter is in the initial cavity length, only part of spectral lines in the signal light are filtered out; the part of the spectral lines which are filtered out can be distinguished and acquired by a linear array detector; the length of the Fabry-Perot cavity is changed by using a driver and the other part of the spectral lines in the signal light are filtered out; the other part of the spectral lines which are filtered out can also be distinguished and acquired by the linear array detector; all parts of spectrums acquired under the condition of different cavity lengths are synthesized to achieve spectrum splicing of the wide spectrum range; and an enveloping surface obtained after the spectrum splicing is the detected spectrogram of the signal light. By means of the spectral resolution enhancement method, the spectrum resolution of a grating spectrometer can be effectively improved while the free spectrum range of the grating spectrometer is guaranteed.

Description

technical field [0001] The invention belongs to the field of spectrum measurement, in particular to a method for improving the resolution of a grating spectrometer based on a Fabry-Perot cavity scanning filter. technical background [0002] Spectral analysis technology is a technology that uses optical principles to measure and analyze the structure and composition of substances. It is widely used in physics, chemistry, biology, medicine, astronomy, geology, materials science and other fields. With the development of scientific research and production technology, spectral detection technology is gradually applied to various occasions such as environmental monitoring, field detection, and industrial online detection. However, conventional spectrometers are bulky and poor in portability, and are not suitable for portable use and large-scale promotion. Therefore, it is necessary to study the miniaturization design of spectrometers. [0003] The most common miniaturization sche...

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Application Information

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IPC IPC(8): G01J3/28G01J3/02
Inventor 方亮姚军石振东邱传凯周崇喜
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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