  In this work, a serial on-line cluster reconstruction technique based on FPGA
technology was developed to compress experiment data and reduce the dead time
of data transmission and storage. At the same time, X-ray imaging experiment
based on a two-dimensional positive sensitive triple GEM detector with an
effective readout area of 10 cm*10 cm was done to demonstrate this technique
with FPGA development board. The result showed that the reconstruction
technology was practicality and efficient. It provides a new idea for data
compression of large spectrometers.
