A method for calibrating the effective area of ​​an X-ray grazing incidence mirror

Abstract

The invention discloses an X-ray grazing-incidence reflecting-mirror effective area calibration method. The method comprises the following steps of adjusting a diaphragm aperture and a distance between the diaphragm aperture and an X-ray tube, and starting a narrow-beam X-ray source; measuring an X-ray narrow beam intensity; aligning an X-ray grazing-incidence reflecting mirror and the narrow-beam X-ray source; using a two-dimensional translation platform to scan the X-ray grazing-incidence reflecting mirror; measuring a photon number C of a reflecting-mirror focal point; calculating an on-axis effective area of the X-ray grazing-incidence reflecting mirror; and rotating the X-ray grazing-incidence reflecting mirror, repeating the step4 to the step6 and then acquiring an off-axis effective area of the X-ray grazing-incidence reflecting mirror. In the invention, through the adjustable aperture diaphragm, a diameter of a X-ray beam is limited, a high-collimation X-ray calibration beam is realized, and a problem that a traditional high-collimation X-ray calibration beam is difficult to acquire is solved; and through arranging the two-dimensional translation platform, a technical effect that a narrow beam scans and calibrates an effective area of the grazing-incidence reflecting mirror is reached and a defect that calibration accuracy is not high in a traditional method is overcome.

Description

technical field [0001] The invention relates to a method for calibrating the effective area of ​​an X-ray grazing incidence mirror, belonging to the technical field of X-ray optics. Background technique [0002] X-ray grazing incidence mirrors are the core of space-based astronomical observation, space environment monitoring, deep space exploration and navigation tasks, and can increase the collection area of ​​X-ray photons and improve the signal-to-noise ratio of the system. The effective area of ​​the X-ray grazing incidence mirror is the product of the geometrical optics collection area of ​​the system and the reflectivity of the mirror, reflecting the ability of the grazing incidence mirror to collect X-ray photons. Therefore, the calibration of the effective area of ​​the X-ray grazing incidence mirror is a key link in testing and verifying the performance index of the X-ray grazing incidence mirror. [0003] The calibration of the effective area of ​​the X-ray grazin...

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Problems solved by technology

[0005] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art, the present invention provides a method for calibrating the effective area of ​​an X-ray grazing incidence mirror, which limits the diameter of the X-ray beam through an adjustable aperture stop and achieves high collimation The X-ray calibration beam solves the problem that the traditional high-collimation X-ray calibration beam is difficult to obtain; by setting a two-dimensional translation stage, the technical effect of narrow beam scanning to calibrate the effective area of ​​the grazing-incidence mirror is achieved, making up for the calibration accuracy of the traditional method Not high defects; by setting a two-dimensional rotating table, the calibration of the off-axis effective area of ​​the grazing incidence mirror is realized, and the problem of poor parallelism of the traditional calibration method is overcome

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