Signal excitation acquisition device and method for high-precision phase measurement for magnetic induction imaging

Abstract

The invention discloses a signal excitation acquisition device and method for high-precision phase measurement for magnetic induction imaging. The device comprises at least 16 excitation collectors, wherein the excitation collectors are connected with collection amplifiers and excitation amplifiers respectively. The collection amplifiers are connected with multi-path switches 1, and the excitation amplifiers are connected with multi-path switches 2; and the excitation collectors are connected with a power switch time sequence controller. One-time acquisition and excitation are adopted, so that after current excitation and acquisition electrodes finish current acquisition, power is cut off simultaneously, and the next-time excitation and acquisition functions are realized by other two electrodes preheated during acquisition; and two electrodes can be preheated simultaneously in every acquisition, so that the problem of non-uniform temperature of an exciting coil in the process of transferring from excitation to reception after being powered on continuously is solved, and the measurement is less influenced by the temperature, power-on heat is balanced to the greatest degree, and phase drift is enabled to be minimum.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic sensors, in particular to a signal excitation acquisition device and method for high-precision phase measurement of magnetic induction imaging. Background technique [0002] High-precision magnetic induction imaging relies on high-precision phase measurements. And high-precision phase measurement depends on high-precision, high-stability signal excitation and acquisition methods. [0003] All induction drives and collectors of the traditional excitation acquisition system are powered on at any stage of excitation and acquisition as well as non-excitation and non-acquisition. Chinese patent 201410260579.5 discloses a high-precision data acquisition system for electrical impedance imaging, and one such system is described. [0004] Since the general magnetic induction imaging measurement system has at least 16 excitation collectors, the static power consumption of the system is very large....

AI Technical Summary

Problems solved by technology

However, it is not acceptable to turn on the power when the excitation and acquisition are performed, because the circuit needs a certain stabilization time from startup to normal operation.

Therefore, the preheating method is generally used, that is, the transceiver that needs to be stimulated and collected in the next measurement sequence, the power supply is turned on to preheat in advance when the previous group of transceivers are working, and the length of power-on time will also affect the accuracy of high-precision signal acquisition. Spend

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