In order to further improve measuring precision of electrical capacitance tomography（ ECT） acquiring system

analyze and research on effect of integrity of ECT signal on measurement results. Aiming at characteristics of weak measuring capacity signal

and the value is in p F level

an ECT acquisition system designed considering signal integrity

duty ratio of sensor is 81 %. Then

the above system is used to analyze the effect of signal integrity on measured results. Experimental results show that when the peak-to-peak value of sine excitation signal is18. 7 V

after current voltage（ C/V） conversion

the voltage peak-to-peak value of the collected biggest signal is921 m V

which is consistent with the theoretical calculation results; by using sensitivity matrix coefficient algorithm

clear ECT images are obtained on PC. The results show that the system meets the requirements of measurement precision of system.