The objective of HXI is to investigate how energy from the sun is released in solar flares.
The relative displacement and rotation were tested from assembly to on-orbit operation and must be maintained under 36 μm and 10 arcsecs.
When HXI reaches a thermal balanced state, further deformation measurements are done and collimator alignment is tested which is essential for accurate imaging.
Deformation of the equipment was mainly influenced by vibration during launch and temperature differences in orbit.
Differential Nonlinearity (DNL) Effect Correction is a calibration technique used to address inaccuracies in data from analog-to-digital converters. It ensures that the energy levels of X-rays from solar flares are accurately represented in the digital data.
The energy calibration is done to calibrate the corresponding energy (keV) for each of the ADC channels of each detector. Mixed calibration sources of Barium and Americium are housed inside every detector module.
Detector response matrix describes how an Hard XRay detector records count flux from incident photon flux. It converts count spectra and images back to photon spectra and images of the X-ray source.
Four-Quadrant Method (FQM) and Least Square Method (LSM)—have been used to determine the position of the Sun’s center in the image.
source:https://link.springer.com/article/10.1007/s11207-024-02392-x
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