Fabry-Perot interferometer non-total interference circular ring optical system

Abstract

The invention provides a Fabry-Perot interferometer non-total interference circular ring optical system, and the system comprises a plurality of front telescope objective lenses, a collimation module, an F-P etalon, a light reflection module, and a focusing imaging module. Wherein the light reflection module is of a multi-face pyramid structure and is used for reflecting output light of the F-P etalon to the same direction. The Fabry-Perot interferometer non-total interference circular ring optical system has the advantages that the Fabry-Perot interferometer non-total interference circular ring optical system can simultaneously observe incident light in multiple directions, and observation efficiency is greatly improved.

Description

Technical Field

[0001] The present application belongs to the fields of spectroscopy, laser technology, and communication technology, and specifically relates to a Fabry-Perot interferometer non-total interference circular ring optical system. Background Art

[0002] The Fabry-Perot interferometer is based on the principles of Doppler shift and Doppler broadening to observe the line of sight respectively. It is a multi-beam interferometer composed of two parallel glass plates, in which the opposite inner surfaces of the two glass plates have high reflectivity. This interferometer is often called a Fabry-Perot resonant cavity. When the two glass plates are fixed with a hollow spacer of a fixed length, it is also called a Fabry-Perot etalon or simply a standard. The characteristic of the Fabry-Perot interferometer is that when the frequency of the incident light meets its resonance condition, its transmission spectrum will have a very high peak, corresponding to a very high transmittance. The Fabry-Perot interferometer is widely used in the observation of wind fields and temperatures in the middle and upper atmosphere.

[0003] The Fabry-Perot interferometer belongs to equal-inclination interferometer, and its optical system forms a 360° equal-inclination interferometer ring. If a full interferometer ring is formed, the wind speed or temperature in one line of sight can only be observed at one time. The time resolution of this method of observation is relatively low. If the ground-based FPI needs to observe five directions to obtain a set of data, the FPI needs to observe five times in sequence to obtain a set of data, which seriously affects the observation efficiency and thus seriously affects the extraction efficiency of the observed phenomenon. Summary of the invention

[0004] The purpose of the present application is to overcome the defect of low observation efficiency of the existing Fabry-Perot interferometer.

[0005] In order to achieve the above-mentioned object, the present application proposes a Fabry-Perot interferometer non-total interference ring optical system, the system comprising:

[0006] Several front telescope objective lenses, collimation modules and FP etalons, as well as a light reflection module and a focusing imaging module; among them,

[0007] The light reflection module is a multi-faceted pyramid structure, which is used to reflect the output light of multiple FP etalons to the same direction.

[0008] As an improvement of the above system, the plurality of front telescope objective lenses, the collimation module and the FP standard tool are located in the same plane, and each front telescope objective lens receives light in one direction.

[0009] As an improvement to the above system, each side surface of the multi-faceted pyramid has a set angle, so that the plane formed by the incident light and the reflected light is perpendicular to the bottom surface of the multi-faceted pyramid.

[0010] As an improvement to the above system, the front telephoto objective lens is radially off-axis.

[0011] Compared with the prior art, the advantages of this application are:

[0012] 1. The Fabry-Perot interferometer non-total interference ring optical system provided by the present application can simultaneously observe incident light from multiple directions, greatly improving the observation efficiency;

[0013] 2. The non-total interference circular ring optical system of the Fabry-Perot interferometer provided in the present application has a simple structure and good stability. The front telescope objective lens of the Fabry-Perot interferometer is radially off-axis, so that multiple optical paths do not interfere with each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Shown is a schematic diagram of the optical composition of the Fabry-Perot interferometer;

[0015] Figure 2 The figure shows the non-total interference ring optical system of the Fabry-Perot interferometer;

[0016] Figure 3 The figure shows a structural diagram of a light reflection module according to an embodiment of the present application;

[0017] Figure 4 Shown is a circular ring simulation diagram of non-total interference in five directions of a Fabry-Perot interferometer according to an embodiment of the present application. DETAILED DESCRIPTION

[0018] The technical solution of the present application is described in detail below with reference to the accompanying drawings.

[0019] like Figure 1 As shown, the Fabry-Perot interferometer includes a front telephoto objective lens, a collimation module, an FP etalon and a focusing imaging module. Among them:

[0020] The front telescope objective lens is used to magnify the light source or target to be measured and focus the light to the entrance of the interferometer.

[0021] The collimation module, including the field stop, collimator and filter, is used to ensure the parallelism of light, improve measurement accuracy and optimize the interference effect.

[0022] The FP standard is made by using the principle of multi-beam interference. It can form a series of very narrow, equally inclined bright stripes. The spacing and position of these stripes are closely related to the wavelength and frequency of the incident light. It can also be used to accurately measure the wavelength and wavelength difference of light waves. When the light source contains two spectral components with very close wavelengths, they will each form a set of annular stripes. By measuring the diameter and position of these stripes, the difference between different wavelengths can be calculated.

[0023] The focusing imaging module, including a focusing mirror and an image plane, can obtain the interference image of the object to be measured through precise focusing and imaging technology, thereby realizing the measurement and analysis of parameters such as object shape, surface roughness, and refractive index.

[0024] In order to achieve the purpose of simultaneously observing multiple line of sight directions, the present application provides a Fabry-Perot interferometer non-total interference ring optical system, which can enable observations in multiple directions on a plane to be simultaneously imaged on the same detector, that is, the Fabry-Perot interferometer can observe wind speed or temperature in multiple line of sight directions with one interference. This method can greatly improve the observation time resolution.

[0025] like Figure 2 As shown, the Fabry-Perot interferometer non-total interference ring optical system includes multiple front telescope objective lenses, collimation modules and FP standards, a light reflection module and a focusing imaging module. Among them:

[0026] The front telescope objective lens, collimation module, FP etalon and focusing imaging module are the same as those of the existing Fabry-Perot interferometer.

[0027] Multiple front telescope objective lenses, collimation modules and FP etalons receive light incident at different angles on the same plane. The front telescope objective lenses, collimation modules and FP etalons are placed according to the angle of the light to be observed, so that the light output by the FP etalon is focused to the same point. A light reflection module is placed on this focal point. The light reflection module reflects the light output from multiple FP etalons to the normal direction of the observation plane. The light output by each FP etalon is reflected into arc-shaped equal-inclination bright stripes, and finally a series of circular equal-inclination bright stripes are formed. The focusing imaging module is located in the direction of the light output by the light reflection module, and focuses and images a series of circular equal-inclination bright stripes.

[0028] The light reflection module is a multi-faceted pyramid structure. The number of sides of the pyramid is equal to the number of incident light rays that need to be observed simultaneously, and the side of the pyramid has a certain angle so that the plane formed by the incident light and the reflected light on the side of the pyramid is perpendicular to the bottom of the multi-faceted pyramid.

[0029] When the Fabry-Perot interferometer non-total interference ring optical system is used for observation, light beams in multiple directions are reflected through the same light reflection module into the same Fabry-Perot interference optical path, and finally imaged simultaneously on the same detector.

[0030] like Figure 2 , Figure 3 and Figure 4 As shown in FIG. 1 , an embodiment of the present application has five sets of front telescope objective lenses, collimation modules and FP etalons, which can simultaneously observe input light from five different directions on a plane. The light reflection module is a pentagonal pyramid structure (such as Figure 3 The side of each pyramid faces the output light of an FP etalon, and the image formed by the final focusing imaging module is as follows: Figure 4 shown.

[0031] The non-total interference annular optical system of the Fabry-Perot interferometer provided in the present application has a simple structure and good stability. The front telescope objective lens of the Fabry-Perot interferometer is radially off-axis to achieve non-interference of multiple optical paths.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application and are not intended to limit it. Although the present application is described in detail with reference to the embodiments, a person skilled in the art should understand that any modification or equivalent replacement of the technical solution of the present application does not depart from the spirit and scope of the technical solution of the present application and should be included in the scope of the claims of the present application.

Claims

1. A Fabry-Perot interferometer non-total interference ring optical system, characterized in that: The system comprises: Several front telescope objective lenses, collimation modules and FP etalons, as well as a light reflection module and a focusing imaging module; among them, The light reflection module is a multi-faceted pyramid structure, which is used to reflect the output light of multiple FP etalons to the same direction.

2. The Fabry-Perot interferometer non-total interference ring optical system according to claim 1, characterized in that: The plurality of front telephoto objective lenses, the collimating module and the FP standard tool are located in the same plane, and each front telephoto objective lens receives light in one direction.

3. The Fabry-Perot interferometer non-total interference ring optical system according to claim 1, characterized in that: The multi-faceted pyramid has a side surface of each pyramid with a set angle, so that the plane formed by the incident light and the reflected light is perpendicular to the bottom surface of the multi-faceted pyramid.

4. The Fabry-Perot interferometer non-total interference ring optical system according to claim 1, characterized in that: The front telephoto objective lens is radially off-axis.

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