Active drainage mechanism for suppressing turbulence at the refraction point of high-power beams in the lens barrel

Abstract

The present invention discloses an active flow-guiding mechanism for suppressing turbulence at the refraction point of a high-power light beam within a lens barrel. The mechanism comprises a lens barrel and a deflection mirror disposed at the lens barrel's bend, with at least one air extraction hole disposed on the lens barrel. By providing the air extraction hole on the lens barrel, the mechanism controls the flow velocity at the deflection point, thereby improving the thermal effect generated by the deflection mirror, forming a stable laminar boundary layer, and avoiding turbulence in the flow field at that point, thereby improving the quality of light beam transmission.

Description

Technical Field

[0001] The present invention relates to the field of optical system lens barrels, and more particularly to an active drainage mechanism for suppressing turbulence at a refraction point of a high-power light beam in a lens barrel. Background Art

[0002] In optical devices, mirror tubes are often used to construct beam propagation channels, and deflecting mirrors are often used to redirect the beam, such as in the classic "Kude" optical path. When a high-power beam propagates within a mirror tube, a low-absorption gas is often introduced to reduce absorption of the beam's energy. However, turbulence often forms at the deflecting mirror. This is due to the presence of the deflecting mirror and its frame, which absorb the high-power beam at a higher rate than the gas within the tube, converting the absorbed light energy into heat, creating a heat island effect within the transmission path. Furthermore, the high flow resistance at the deflection point hinders the diffusion of the heat, exacerbating the temperature rise. These two factors contribute to a gradual increase in local temperature over time, creating a large temperature gradient that further exacerbates turbulence. Turbulence is a highly inhomogeneous optical medium, which can affect beam quality, such as the optical wavefront shape and beam energy concentration. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides an active drainage mechanism for suppressing turbulence at the refraction point of a high-power light beam in a lens barrel.

[0004] The present invention is achieved through the following technical solutions:

[0005] An active drainage mechanism for suppressing turbulence at the refraction point of a high-power beam within a lens barrel comprises a lens barrel and a deflection mirror disposed at the bend of the lens barrel, with at least one air extraction hole disposed therein. The at least one air extraction hole in the lens barrel accelerates heat transfer at the deflection point by controlling the air extraction rate, improving the thermal effect generated by the deflection mirror, forming a stable laminar boundary layer, avoiding turbulence in the flow field at that point, and improving beam transmission quality.

[0006] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0007] 1. The present invention provides an exhaust hole on the lens barrel to control the flow velocity at the turning point, thereby improving the thermal effect generated by the turning mirror, forming a stable laminar boundary layer, avoiding turbulence in the flow field at this point, and improving the quality of light beam transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention.

[0009] Figure 1 It is a structural schematic diagram of the drainage mechanism of the present invention.

[0010] Figure 2 This is the flow velocity distribution at the refraction point in the lens barrel when no active drainage mechanism is used.

[0011] Figure 3 This is the flow velocity distribution at the refraction point inside the lens barrel when the active drainage mechanism is used. DETAILED DESCRIPTION

[0012] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with examples and drawings. The exemplary embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0013] Example 1

[0014] like Figure 1 The active drainage mechanism shown is used to suppress turbulence at the refraction point of a high-power light beam in a lens barrel, comprising a lens barrel 2 and a turning mirror 1 arranged at the bend of the lens barrel. The connection structure between the lens barrel 2 and the turning mirror 1 is an existing structure. At least one exhaust hole 3 is provided on the lens barrel 2. That is, according to the specific lens barrel specifications, exhaust rate and other conditions, the number of exhaust holes can be selected according to the situation, and only one, two, three or more exhaust holes can be provided; the aperture of the exhaust hole 3 is 0.1m to 0.01m.

[0015] Experiments have shown that the position of the exhaust hole is preferably set at a distance of 0.4 cm to 2 cm from the deflection mirror.

[0016] Example 2

[0017] This embodiment is based on the principle of Example 1. This embodiment discloses a specific implementation method and illustrates its technical advantages in combination with experimental data.

[0018] like Figure 1 As shown, the drainage mechanism includes a lens barrel 2 and a deflection mirror 1 located at the lens barrel's turning point. The inventors continuously optimized and simulated the number, diameter, and location of the exhaust holes, ultimately selecting an optimal implementation. Two exhaust holes 3 are provided on the lens barrel, one at each end of the deflection mirror 1, namely, at the front and rear ends of the deflection mirror 1 along the air intake direction. The lens barrel 2 has a diameter of 0.5 m, and the exhaust holes on both sides are located 0.1 m from the deflection mirror 1. The exhaust holes have an aperture of 0.05 m. Nitrogen gas is introduced into the lens barrel 2 at a flow rate of 0.5 m / s, i.e., low-speed exhaust.

[0019] Figure 2The figure shows the velocity distribution at the refraction point when no exhaust holes are installed. The numbers in the velocity distribution contour indicate the velocity magnitude. Nitrogen gas at a flow rate of 0.5 m / s is introduced into the tube. When the gas flows through the deflection mirror, turbulence forms around the mirror. The circular cross-section diagram shows the flow field and flow pathline distribution along the radial section of the tube after the gas flows through the deflection point. Flow pathlines represent the curves traced by fluid particles moving in space. The figure shows two completely symmetrical elliptical vortices at the bottom of the tube, with a major diameter of approximately 0.25 m and a minor diameter of approximately 0.1 m. Turbulence deflects the light transmitted through them, affecting beam transmission quality. Furthermore, because the tube transmits a high-power beam, the deflection mirror and its supporting structure absorb heat. The turbulence at the bend hinders heat dissipation, exacerbating the temperature rise there. The rightmost figure shows the wavefront shape of parallel light transmitted through the tube after passing through the flow field. The root mean square (RMS) of the wavefront shape at the tube exit is 0.05 lambda (wavelength).

[0020] Using the active drainage mechanism of this embodiment, nitrogen with a flow rate of 0.5 m / s is also introduced into the lens barrel. The simulation results are as follows: Figure 3 As shown in the figure, the grayscale color contrast within the tube is reduced, and the velocity distribution is more uniform. The circular cross-section shows that the turbulence intensity is reduced, the velocity within the tube is uniform, and no turbulence occurs in this area. Calculations of the parallel light transmitted through the tube show that the RMS (root mean square) of the wavefront at the tube exit is 0.013 Lambda (wavelength), indicating excellent beam transmission quality.

[0021] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An active drainage mechanism for suppressing turbulence at a refraction point of a high-power light beam in a lens barrel, comprising a lens barrel (2) and a turning mirror (1) arranged at a bend of the lens barrel, characterized in that: The lens barrel (2) is provided with at least one air extraction hole (3); The distance between the air extraction hole (3) and the turning mirror (1) is 0.4 cm to 2 cm; There are two gas extraction holes (3), which are respectively placed at the front end and the rear end of the deflection mirror (1) along the direction of gas flow rate; The diameter of the lens barrel (2) is 0.5 m, and the aperture of the air extraction hole is 0.05 m.

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