A variable pitch piezoelectric grid

Abstract

The invention provides a piezoelectric grid with a variable spacing. The piezoelectric grid comprises a screen grid with a clamping head, an annular heat-insulation ceramic sleeve with a clamping head, an annular heat-insulation ceramic sheet, an annular piezoelectric ceramic, a piezoelectric ceramic driving power supply and an acceleration grid, wherein the annular heat-insulation ceramic sleevesleeves the screen grid, the clamping head of the annular heat-insulation ceramic sleeve is matched with the clamping head of the screen grid, the annular piezoelectric ceramic sleeve sleeves the annular heat-insulation ceramic sleeve, the annular heat-insulation ceramic sheet is arranged at the top of the annular piezoelectric ceramic, a bottom end of the annular piezoelectric ceramic is fixed with the clamping head of the annular heat-insulation ceramic sleeve, a top end of the annular piezoelectric ceramic is fixed with the annular heat-insulation ceramic sheet, a wire is correspondingly added to high-temperature curing conductive adhesives at two ends, and the other ends of the two wires are connected with the piezoelectric ceramic driving power supply. The distance between the grids is changed by the piezoelectric ceramic, voltage change required by thrust change is matched, so that the ion optical beam focusing state of the grids is maintained.

Description

technical field [0001] The invention belongs to the field of space propulsion technology, and in particular relates to a variable pitch piezoelectric grid. Background technique [0002] In recent years, gravitational wave detection in space is becoming the frontier of precision measurement physics research. In order to suppress the measurement noise caused by external disturbances such as solar wind and solar light pressure, the satellite attitude and orbit control technology based on high-precision drag-free control puts extremely high requirements on the satellite micro-propulsion system. Ion thrusters have become the first choice for satellite thrusters due to their advantages such as high specific impulse, wide range of thrust variation, and mature technology. However, in order to make the spacecraft's attitude control and position maintenance very accurate, the ion thruster needs to change the thrust to meet the mission requirements. The ion thruster changes the thrus...

AI Technical Summary

Problems solved by technology

The ion thruster changes the thrust by changing the voltage. Since the focusing state of the ion optical beam of the grid is determined by the grid spacing and voltage, in order to maintain the focusing state of the ion optical beam of the grid, the grid spacing also needs to change with the voltage. However, there is no effective strategy for variable-pitch gate implementation

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