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CN-122016229-A - Motor-driven high-speed wind tunnel femtosecond laser molecular marker speed measurement system

CN122016229ACN 122016229 ACN122016229 ACN 122016229ACN-122016229-A

Abstract

A motorized high-speed wind tunnel femtosecond laser molecular marker speed measuring system belongs to the technical field of femtosecond laser molecular marker speed measuring. The method aims to solve the problem of flow field measurement of integral movement. The system comprises a movable femtosecond laser source platform, a plano-convex lens, a long-focus lens, an image intensifier, a high-speed camera and a computer device, wherein femtosecond laser emitted by the movable femtosecond laser source platform passes through the plano-convex lens and irradiates on a flow field area to be measured, the movable femtosecond laser source platform is respectively connected with the image intensifier and the high-speed camera, the high-speed camera is respectively connected with the image intensifier and the computer device, the image intensifier is connected with the long-focus lens, and the long-focus lens is used for shooting the flow field area to be measured irradiated by the femtosecond laser. According to the invention, the femtosecond laser, the temperature control module, the time sequence control unit and the light path shaping component are packaged in the same movable platform in a concentrated manner, so that the measuring system has good overall stability and deployment flexibility in a wind tunnel environment.

Inventors

  • ZHONG HONGJIE
  • GUO TONGYU
  • Kan qi
  • CHANG GUANG
  • Men Guannan

Assignees

  • 中国航空工业集团公司沈阳空气动力研究所

Dates

Publication Date
20260512
Application Date
20260320

Claims (9)

  1. 1. The mobile high-speed wind tunnel femtosecond laser molecular marking speed measuring system is characterized by comprising a movable femtosecond laser source platform (1), a plano-convex lens (2), a tele lens (3), an image intensifier (4), a high-speed camera (5) and a computer device (6); The method comprises the steps that femtosecond laser emitted by a movable femtosecond laser source platform (1) passes through a planoconvex lens (2) to be irradiated onto a flow field area (7) to be detected, the movable femtosecond laser source platform (1) is respectively connected with an image intensifier (4) and a high-speed camera (5), the high-speed camera (5) is respectively connected with the image intensifier (4) and a computer device (6), the image intensifier (4) is connected with a tele lens (3), and the tele lens (3) is used for shooting the flow field area (7) to be detected irradiated by the femtosecond laser.
  2. 2. The motorized high-speed wind tunnel femtosecond laser molecular marker speed measurement system according to claim 1, wherein a laser light outlet (8), a steel handle (9) and a front department group (14) are arranged on the upper portion of the front face of the movable femtosecond laser source platform (1), a lower ventilation blocking plate (12) is arranged on the lower portion of the front face of the movable femtosecond laser source platform (1), an acrylic observation door group (10) is arranged on the upper portion of the back face of the movable femtosecond laser source platform (1), a wire plugging hole panel (11) and a lower ventilation blocking plate (12) are arranged on the lower portion of the back face of the movable femtosecond laser source platform (1), and universal casters (13) are arranged on the bottom of the movable femtosecond laser source platform (1).
  3. 3. The mobile high-speed wind tunnel femtosecond laser molecular marking speed measurement system according to claim 2, wherein a femtosecond laser (15), a reflecting mirror (16), a damping air floatation device (17) and a marble bracket (21) are arranged in an upper space in the movable femtosecond laser source platform (1), the femtosecond laser (15) is placed on the marble bracket (21), the damping air floatation device (17) is arranged at the lower part of the marble bracket (21), a plurality of reflecting mirrors (16) are arranged on the side surface of the femtosecond laser (15), and an air conditioner (18), a water cooler (19) and a signal generator (20) are arranged in a lower space in the movable femtosecond laser source platform (1).
  4. 4. The system for measuring the speed of the femto-second laser molecular marker of the motorized high-speed wind tunnel according to claim 3, wherein the reflecting mirror is used for adjusting the laser transmission light path so as to meet the light path layout requirements under different experimental conditions.
  5. 5. The system for measuring the speed of the femto-second laser molecular marker of the motorized high-speed wind tunnel according to claim 4, wherein a power line outgoing hole, a control line outgoing hole and a synchronous trigger signal line outgoing hole are formed in the plug wire hole panel (11).
  6. 6. The system for measuring the speed of a motorized high-speed wind tunnel femtosecond laser molecular marker according to claim 5, wherein the signal generator (20) is used for generating a time sequence control signal to provide synchronous trigger for the cooperative work of a high-speed camera, an image intensifier and a laser.
  7. 7. The motorized high-speed wind tunnel femtosecond laser molecular marker speed measurement system of claim 6, wherein the motorized high-speed wind tunnel femtosecond laser molecular marker speed measurement system performs distance calibration before use.
  8. 8. The motorized high-speed wind tunnel femtosecond laser molecular marker speed measurement system of claim 7, wherein the motorized high-speed wind tunnel femtosecond laser molecular marker speed measurement system is designed in a time sequence control manner.
  9. 9. The motorized high-speed wind tunnel femtosecond laser molecular marker speed measurement system of claim 8, wherein the motorized high-speed wind tunnel femtosecond laser molecular marker speed measurement system acquires laser stripe images under different time delay conditions, and the laser stripe images are processed by an image processing algorithm to obtain clear laser stripe images.

Description

Motor-driven high-speed wind tunnel femtosecond laser molecular marker speed measurement system Technical Field The invention belongs to the technical field of femtosecond laser molecular marker speed measurement, and particularly relates to a motorized high-speed wind tunnel femtosecond laser molecular marker speed measurement system. Background In wind tunnel tests and aerodynamic tests, the laser-based flow field measurement technique is widely used for measuring local speed, density variation and flow structure due to the characteristics of non-contact, quick response, small interference to flow and the like. However, such measurements often rely on a variety of independent precision equipment, including femtosecond lasers, optical reflection assemblies, timing control units, and air conditioning, water cooling, etc. for stable operation. The existing test system is mainly arranged in a fixed or distributed mode, is not beneficial to quick adjustment among different test sections and different measuring point positions, and is easy to influence the stability and repeatability of measurement due to long connecting lines among devices and large change of environmental conditions. The wind tunnel test has the characteristics of limited adjustment space, short test time, high repeated construction cost and the like. When the lasers, the gain units, the cooling system and the like are arranged in a scattered mode, the light path alignment period is long, the environment interference factors are large, and the problems of spot drift, synchronization errors, beam path deformation and the like are easily caused by the distance change among different devices. For experiments requiring repeated switching at multiple model locations or multiple observation windows, conventional stationary equipment arrangements are difficult to meet with high efficiency and high consistency requirements. In addition, femtosecond laser systems are highly sensitive to environmental conditions (temperature, humidity, vibration, air cleanliness, etc.), and it is difficult to maintain a consistent working environment for each dispersive device around conventional test control or wind tunnel segments. If the cooling system or air conditioning system is placed separately from the laser, laser instability due to temperature control response time dyssynchrony may occur, thereby reducing the imaging signal-to-noise ratio. Therefore, there is a lack of a flow field measurement system that can integrate key modules such as a laser system, a heat dissipation system, and timing control in a structured manner and that can be moved in its entirety to any test location. Disclosure of Invention The invention aims to solve the problem of realizing a flow field measurement system of integral movement, and provides a motorized high-speed wind tunnel femtosecond laser molecular marker speed measurement system. In order to achieve the above purpose, the present invention is realized by the following technical scheme: A motor-driven high-speed wind tunnel femtosecond laser molecular marker speed measurement system comprises a movable femtosecond laser source platform, a plano-convex lens, a long focal lens, an image intensifier, a high-speed camera and a computer device; the method comprises the steps that femtosecond laser emitted by a movable femtosecond laser source platform passes through a plano-convex lens to irradiate a flow field area to be measured, the movable femtosecond laser source platform is respectively connected with an image intensifier and a high-speed camera, the high-speed camera is respectively connected with the image intensifier and a computer device, the image intensifier is connected with a tele lens, and the tele lens is used for shooting the flow field area to be measured irradiated by the femtosecond laser. Further, the front upper portion of portable femto second laser source platform is provided with laser outlet, steel handle, front department group, the front lower part of portable femto second laser source platform is provided with the lower part and ventilates the closure plate, the upper portion of the back of portable femto second laser source platform is provided with ya keli and observes the door group, the lower part of the back of portable femto second laser source platform is provided with plug wire hole panel, lower part and ventilates the closure plate, the bottom of portable femto second laser source platform is provided with the universal caster. Further, the upper space in the movable femtosecond laser source platform is provided with a femtosecond laser, a reflecting mirror, a damping air floatation device and a marble support, the femtosecond laser is placed on the marble support, the damping air floatation device is installed at the lower part of the marble support, a plurality of reflecting mirrors are arranged on the side face of the femtosecond laser, and the lower space in the movable femtosecond lase