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Method for directly measuring specific impulse of laser ablation micro-propulsion

A technology of laser ablation and measurement method, which is applied in the field of micro-propulsion to achieve the effect of avoiding working medium pollution, avoiding disassembly and assembly of working medium, and good versatility

Active Publication Date: 2017-05-10
PLA PEOPLES LIBERATION ARMY OF CHINA STRATEGIC SUPPORT FORCE AEROSPACE ENG UNIV
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is: Aiming at the specific impulse measurement problem of pulsed laser ablation, a method based on a vertical motion torsion structure that can simultaneously measure the impulse generated by a single-pulse laser ablation working medium and the corresponding ablation weight , so that the specific impulse can be directly measured

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  • Method for directly measuring specific impulse of laser ablation micro-propulsion
  • Method for directly measuring specific impulse of laser ablation micro-propulsion
  • Method for directly measuring specific impulse of laser ablation micro-propulsion

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[0020] specific implementation plan

[0021] The specific impulse direct measurement method for laser ablation micro-propulsion is further described in detail with reference to the accompanying drawings. figure 1 It is the force diagram of the vertical torsional torsion pendulum of the present invention. When the laser incident direction is direction 1, the thrust generated by the ablation working fluid is f 1 (t), the gravity produced by the mass consumption of the working medium is m(t)g, which is called the same direction action; when the laser incident direction is direction 2, the thrust generated by the ablation working medium is f 2 (t), the gravity due to the mass consumption of the working medium is m(t)g (under the same laser parameters and working medium conditions, it is assumed that the mass of each ablation is the same), which is called an anisotropic effect. For convenience, set f 1 (t), f 2 The force arm of (t) and m(t)g is both b.

[0022] The direct meas...

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Abstract

The invention discloses a method for measuring the impulse generated by a single-pulse laser ablation working medium and the corresponding ablation weight, and achieves the purpose of directly measuring the specific impulse. The method comprises the steps: obtaining the corresponding impulse and ablation weight in a mode that the weight isotropic and anisotropic effects aroused by the pulse generated by the single-pulse laser ablation working medium and the ablation weight are respectively carried out once based on a vertical motion torsional pendulum model; obtaining the impulse according to the maximum peak value of each torsional pendulum rotation angle and a rotation angle measurement value before the maximum peak value, and obtaining the ablation weight of the working medium according to a stable rotation angle mean value of the torsional pendulum rotation angles. The method can shorten the test cycle, avoids the frequent disassembly and assembly of the working medium, protects the working medium from being polluted, guarantees the measurement authenticity, and improves the specific impulse measurement precision.

Description

technical field [0001] The invention relates to the specific impulse measurement technology in the field of micro propulsion. Background technique [0002] Laser micropropulsion technology is the most promising development direction in the field of laser propulsion. The working principle of laser micro-propulsion is to shape and focus the pulsed laser on the surface of the working medium, and form a tiny jet of material through the interaction between the laser and the material to achieve a macroscopic impulse effect. Specific impulse is an important indicator for evaluating the propulsion performance of laser micro-propulsion, which represents the magnitude of the impulse generated by the ablation unit weight of working fluid. Accurate measurement of specific impulse is helpful for analyzing the ablation coupling mechanism between laser and working medium, and also for the design of laser ablation micro thruster. [0003] Usually, the measurement of specific impulse is ob...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M11/00
CPCG01M11/00
Inventor 周伟静金星常浩叶继飞李南雷
Owner PLA PEOPLES LIBERATION ARMY OF CHINA STRATEGIC SUPPORT FORCE AEROSPACE ENG UNIV
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