CN111158106A - Active drainage mechanism for inhibiting turbulence at high-power light beam refraction position in lens cone - Google Patents
Active drainage mechanism for inhibiting turbulence at high-power light beam refraction position in lens cone Download PDFInfo
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- CN111158106A CN111158106A CN202010199011.2A CN202010199011A CN111158106A CN 111158106 A CN111158106 A CN 111158106A CN 202010199011 A CN202010199011 A CN 202010199011A CN 111158106 A CN111158106 A CN 111158106A
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- lens barrel
- lens cone
- turbulence
- lens
- light beam
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/18—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/18—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors
- G02B7/181—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors with means for compensating for changes in temperature or for controlling the temperature; thermal stabilisation
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
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Abstract
The invention discloses an active drainage mechanism for inhibiting turbulence at a high-power light beam refraction position in a lens cone, which comprises the lens cone and a turning mirror arranged at the bending position of the lens cone, wherein at least one air suction hole is formed in the lens cone. The lens barrel is provided with the air exhaust hole, so that the flow velocity of the turning part is controlled, the heat effect generated by the turning mirror is improved, a stable laminar boundary layer is formed, the flow field at the turning part is prevented from generating turbulence, and the transmission quality of light beams is improved.
Description
Technical Field
The invention relates to the field of lens barrels of optical systems, in particular to an active drainage mechanism for inhibiting turbulence at the refraction position of a high-power light beam in a lens barrel.
Background
In optical devices, a lens barrel is often used to construct a channel for light beam propagation, and a turning mirror is often used to turn the light beam propagation, such as: the classical "coude" optical path. When a high-power light beam propagates in the lens barrel, in order to reduce the absorption of the light beam energy by gas, gas with a low absorption coefficient is often introduced. On one hand, the structure has a larger absorption rate of the high-power light beam relative to the gas in the lens barrel, and converts the light energy into heat energy after absorption, thereby forming a heat island effect in a transmission path; on the other hand, the airflow resistance at the turning part is large, which is not beneficial to the diffusion of hot airflow and aggravates the temperature rise effect. Under the influence of the above two factors, the local temperature gradually increases with time, forming a large temperature gradient which further exacerbates the generation of turbulence. Turbulence is a highly inhomogeneous optical medium that affects beam quality, such as: optical wavefront shape, beam energy concentration, etc.
Disclosure of Invention
The present invention provides an active flow guiding mechanism for suppressing turbulence at the high power light beam refraction position in the lens barrel.
The invention is realized by the following technical scheme:
the active drainage mechanism for inhibiting turbulence at the high-power light beam refraction position in the lens cone comprises the lens cone and a turning mirror arranged at the bending position of the lens cone, wherein at least one air suction hole is formed in the lens cone. The lens cone is provided with at least one air exhaust hole, the heat transfer at the turning position is accelerated by controlling the air exhaust speed, the heat effect generated by the turning mirror is improved, a stable laminar boundary layer is formed, the flow field at the position is prevented from generating turbulence, and the transmission quality of light beams is improved.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the lens barrel is provided with the air exhaust hole, so that the flow velocity of the turning part is controlled, the heat effect generated by the turning mirror is improved, a stable laminar boundary layer is formed, the flow field at the turning part is prevented from generating turbulence, and the transmission quality of light beams is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention.
Fig. 1 is a schematic structural view of the drainage mechanism of the present invention.
FIG. 2 is the flow velocity distribution at the refraction position in the lens barrel without the active drainage mechanism.
FIG. 3 is the flow velocity distribution at the refraction position in the lens barrel when the active drainage mechanism is adopted.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
As shown in fig. 1, an active drainage mechanism for suppressing turbulence at a high-power light beam refraction position in a lens barrel includes a lens barrel 2 and a turning mirror 1 disposed at a bending position of the lens barrel, a connection structure of the lens barrel 2 and the turning mirror 1 is an existing structure, the lens barrel 2 is provided with at least one air extraction hole 3, that is, the number of the air extraction holes can be selected according to conditions such as specific lens barrel specification, air extraction rate, and the like, and can be only one, or 2, 3 or more; the diameter of the air exhaust hole 3 is 0.1m to 0.01 m.
Tests prove that the position of the air exhaust hole is preferably arranged at a position which is 0.4 cm to 2 cm away from the turning mirror.
Example 2
The embodiment is based on the principle of embodiment 1, and discloses a specific implementation manner, and the technical advantages of the embodiment are explained by combining experimental data.
As shown in fig. 1, the drainage mechanism includes a lens barrel 2 and a turning mirror 1 disposed at a turning position of the lens barrel, and the inventor finally selects an optimal implementation manner by continuously optimizing and simulating the number, the aperture, the position, and the like of the air extraction holes, i.e., the lens barrel is respectively provided with two air extraction holes 3, and the air extraction holes are respectively disposed at two ends of the turning mirror 1, i.e., are respectively disposed at the front end and the rear end of the turning mirror 1 along the air intake direction. The diameter of the lens cone 2 is 0.5m, the air exhaust holes at both sides are arranged at the position 10.1 m away from the turning mirror, the aperture of the air exhaust hole is 0.05m, and nitrogen with the flow velocity of 0.5 m/s is introduced into the lens cone 2, namely low-speed air exhaust is carried out.
FIG. 2 shows the flow velocity distribution at the refraction site without the extraction holes, and the numbers in the cloud of the velocity distribution indicate the magnitude of the velocity. The nitrogen with the flow speed of 0.5 m/s is introduced into the lens cone, and when the airflow passes through the turning mirror, turbulent flow is formed around the turning mirror, wherein the circular section represents the distribution of flow field flow traces of the radial section of the lens cone after the airflow passes through the turning part of the lens cone, and the flow traces represent the curves drawn by fluid particles during spatial motion. As can be seen from the figure, two perfectly symmetric elliptical vortices appear at the lower part of the barrel, with a long diameter of about 0.25 m and a short diameter of about 0.1 m. The turbulent flow can cause the transmitted light to be deflected, and the transmission quality of the light beam is affected. Meanwhile, as the high-power light beams are transmitted in the lens cone, the turning mirror and the supporting mechanism thereof absorb heat, and the turbulence at the bending part is not beneficial to heat dissipation, thus intensifying the temperature rise at the part. The rightmost diagram in the figure is the wavefront shape of the parallel light transmitted in the lens barrel after passing through the flow field, and the root mean square RMS of the wavefront shape at the outlet of the lens barrel is 0.05 Lambda (wavelength).
By adopting the active drainage mechanism of the embodiment, nitrogen with the flow rate of 0.5 m/s is introduced into the lens barrel, and the simulation result is shown in fig. 3, which shows that the gray color contrast in the lens barrel is reduced and the flow rate distribution is more uniform. As can be seen from the circular section, the intensity of the turbulence is weakened, the flow velocity in the lens barrel is uniform, and the flow field has no turbulence. By calculating the parallel light transmitted in the lens barrel, the RMS (root mean square) of the wavefront shape at the exit of the lens barrel is obtained to be 0.013 Lambda (wavelength), and the transmission quality of the light beam is good.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (5)
1. A initiative drainage mechanism for suppressing interior high power light beam refraction department torrent of lens cone, including lens cone (2) and setting at the turning mirror (1) that the lens cone was bent, its characterized in that: the lens barrel (2) is provided with at least one air suction hole (3).
2. The active flow guiding mechanism for suppressing turbulence at the high power beam refraction site in the lens barrel according to claim 1, wherein the air pumping hole (3) is 0.4 cm to 2 cm away from the turning mirror (1).
3. The active flow guiding mechanism for suppressing turbulence at the high power beam refraction inside the lens barrel according to claim 1, wherein the aperture of the pumping hole (3) is 0.1m to 0.01 m.
4. The active flow guiding mechanism for suppressing turbulence at the high power beam refraction site in the lens barrel according to claim 1, wherein there are two pumping holes (3) respectively disposed at the front end and the rear end of the turning mirror (1) along the gas flow velocity direction.
5. The active flow guiding mechanism for suppressing turbulence at the high power beam refraction inside the lens barrel according to claim 4, wherein the diameter of the lens barrel (2) is 0.5m, the aperture of the air pumping hole is 0.05m, and the distance between the air pumping hole (3) and the turning mirror (1) is 0.1 m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010199011.2A CN111158106A (en) | 2020-03-20 | 2020-03-20 | Active drainage mechanism for inhibiting turbulence at high-power light beam refraction position in lens cone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010199011.2A CN111158106A (en) | 2020-03-20 | 2020-03-20 | Active drainage mechanism for inhibiting turbulence at high-power light beam refraction position in lens cone |
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| CN111158106A true CN111158106A (en) | 2020-05-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010199011.2A Pending CN111158106A (en) | 2020-03-20 | 2020-03-20 | Active drainage mechanism for inhibiting turbulence at high-power light beam refraction position in lens cone |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112578528A (en) * | 2020-12-30 | 2021-03-30 | 四川中科朗星光电科技有限公司 | Secondary mirror supporting structure capable of reducing turbulence phenomenon in optical system and optical system |
| CN115566515A (en) * | 2022-11-10 | 2023-01-03 | 中国航天三江集团有限公司 | Optical path heat effect suppression device in high-power laser |
-
2020
- 2020-03-20 CN CN202010199011.2A patent/CN111158106A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112578528A (en) * | 2020-12-30 | 2021-03-30 | 四川中科朗星光电科技有限公司 | Secondary mirror supporting structure capable of reducing turbulence phenomenon in optical system and optical system |
| CN112578528B (en) * | 2020-12-30 | 2023-03-31 | 四川中科朗星光电科技有限公司 | Secondary mirror supporting structure capable of reducing turbulence phenomenon in optical system and optical system |
| CN115566515A (en) * | 2022-11-10 | 2023-01-03 | 中国航天三江集团有限公司 | Optical path heat effect suppression device in high-power laser |
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