Patent ID: 9256003
Filing Date: 2016-02-09
CPC Classification: E21B,G01V

Claim Text:
1. Three-dimensional focusing induced polarization equipment for advanced geological prediction of a water inrush disaster source in underground engineering, comprising a constant-current multiplex transmitter, an intelligent multichannel receiver, an automatic multi-electrode switch, an industrial personal computer and an electrode system; the electrode system comprises an observation electrode array and shielding electrodes; the observation electrode array comprises a plurality of electrodes, the electrodes in the observation electrode array and the shielding electrodes are respectively connected with the automatic multi-electrode switch, the automatic multi-electrode switch is respectively connected with the constant-current multiplex transmitter and the intelligent multichannel receiver, and the constant-current multiplex transmitter, the intelligent multichannel receiver and the automatic multi-electrode switch respectively communicate with the industrial personal computer; the observation electrode array and the shielding electrodes are arranged on a tunnel excavation surface, any electrode in the observation electrode array is selected as a source electrode, the other electrodes are used as observation electrodes, the industrial personal computer controls the constant-current multiplex transmitter to transmit current of the same polarity to the shielding electrodes and the source electrode, so that the current of the source electrode is nearly directed straight ahead of the excavation surface under the action of the shielding electrodes; the observation electrodes are used for collecting scanning data and feeding back the scanning data to the industrial personal computer through the intelligent multichannel receiver; and the industrial personal computer controls the automatic multi-electrode switch to change the source electrode to perform the next cycle of measurement: the constant-current multiplex transmitter comprises a transmission singlechip system, an inverter circuit, a multiplex driving module, a boosting module, a rectifying module, a current and voltage sampling module and a data collecting module; a power supply generates high-voltage constant current through the inverter circuit, the boosting module and the rectifying module, and the rectifying module is connected with the multiplex driving module; and the the transmission singlechip system controls the inverter circuit, the boosting module and the multiplex driving module to detect current in a feedback circuit through the current and voltage sampling module and controls the multiplex driving module to output adjustable multiplex constant current; the intelligent multichannel receiver comprises multiple parallel receiving modules, multichannel ADC converters and receiving singlechips, which are connected in sequence, and a receiving signal enters the receiving singlechips after passing by the receiving modules and the ADC converters in sequence; the receiving singlechips collect the data of each receiving module and realize control and information feedback with the industrial personal computer through communication so as to perform final processing on digital signals; the automatic multi-electrode switch comprises a multiplex relay switch, a decoding circuit, a converter singlechip, a communication module and a voltage sampling circuit, the industrial personal computer is connected with the converter singlechip through the communication module, the converter singlechip is connected with the multiplex relay switch through the decoding circuit, one end of the multiplex relay switch is connected with the electrode system, and the other end of the multiplex relay switch is connected with the constant-current multiplex transmitter and the intelligent multichannel receiver through multiplex cables; the multiplex relay switch is a high-power relay, meanwhile, the voltage sampling circuit is used for detecting the voltage of the high-power relay, and the voltage is fed back to the industrial personal computer through the converter singlechip so as to quickly switch the large transmissinon current; and the converter singlechip controls the on/off of the multiplex relay switch through an encoding circuit according to a command sent by the industrial personal computer to realize quick conversion of multiple electrodes.