Patent ID: 11965860
Assignee: NORTHWESTERN UNIVERSITY
Field: Measurement (Instruments)
Classification: CPC G | IPC E  G

Claim 9:
10. The test system according to claim 1, wherein a specific process of adjusting the microwave power and the microwave heating time by the dynamic rock response monitoring and intelligent microwave parameter control system comprises the following steps:
firstly, enabling the computer to presetting the microwave initial power, microwave initial heating time, rock initial wave velocity and wave velocity drop threshold through the embedded program, and transmitting the parameters to the controller; setting the acoustic emission cumulative threshold, acoustic emission rate threshold, rock critical breaking point temperature, stable crack growth starting point temperature, unstable crack growth starting point temperature, heating time of unstable crack growth starting point, and unstable crack growth time in the controller; enabling the controller to control the microwave power supply to break the rock sample with the preset microwave initial power and microwave initial heating time;
secondly, in the rock breaking process, enabling the anti-electromagnetic high-temperature resistant acoustic wave-acoustic emission integrated sensor to monitor rock real-time wave velocity and the acoustic emission, and sending the rock real-time wave velocity and the acoustic emission to the computer; besides, enabling the temperature acquisition device to acquire rock real-time temperature, and transmit the acquired temperature to the computer;
finally, enabling the computer to subtract the rock real-time wave velocity from the rock initial wave velocity through the embedded program to obtain the wave velocity drop, and accumulate the acquired acoustic emission count to obtain the acoustic emission cumulative number; computing the acoustic emission count acquired within is to obtain the acoustic emission rate, and enabling the computer to transmit the rock real-time temperature, wave velocity drop, acoustic emission cumulative number and acoustic emission rate to the controller; enabling the controller to compare the wave velocity drop with the preset wave velocity drop threshold; if the wave velocity drop is larger than or equal to the wave velocity drop threshold, enabling the controller to control the microwave power supply to stop heating so as to avoid excessive breaking; if the wave velocity drop is smaller than the wave velocity drop threshold, enabling the controller to compare the rock real-time temperature, the acoustic emission cumulative number and the acoustic emission rate with the rock critical breaking point temperature, the stable crack growth starting point temperature, the unstable crack growth starting point temperature, the acoustic emission cumulative threshold and the acoustic emission rate threshold which are set in the controller as follows:
wherein if the rock temperature is lower than the rock critical breaking point temperature, enabling the controller to control the microwave power supply to hold the microwave initial power and the microwave initial heating time for rock breaking;
wherein if the rock temperature is higher than or equal to the rock critical breaking point temperature, and smaller than the stable crack growth starting point temperature, judging the relation between the acoustic emission cumulative number and the acoustic emission cumulative threshold; if the emission cumulative number is smaller than the acoustic emission cumulative threshold, it shows that the microwave initial power is insufficient, enabling the controller to control the microwave power supply to increase the microwave power for rock breaking; if the emission cumulative number is higher than or equal to the emission cumulative threshold, it shows that the microwave initial power is sufficient, enabling the controller to control the microwave power supply to hold the microwave initial power for continuous rock breaking;
wherein if the rock temperature is higher than or equal to the stable crack growth starting point temperature, and smaller than the unstable crack growth starting point temperature, judging the relation between the acoustic emission rate and the acoustic emission rate threshold; if the acoustic emission rate is smaller than the acoustic emission rate threshold, it shows that the microwave initial power is insufficient, enabling the controller to control the microwave power supply to increase the microwave power for rock breaking; if the acoustic emission rate is larger than or equal to the acoustic emission rate threshold, it shows that the microwave initial power is sufficient, enabling the controller to control the microwave power supply to hold the microwave initial power for continuous rock breaking;
wherein if the rock temperature is higher than or equal to the unstable crack growth starting point temperature, judging the relation between the acoustic emission rate and the acoustic emission rate threshold; if the acoustic emission rate is smaller than the acoustic emission rate threshold, it shows that the microwave initial power is insufficient, enabling the controller to control the microwave power supply to increase the microwave power for rock breaking; if the acoustic emission rate is larger than or equal to the acoustic emission rate threshold, it shows that the microwave initial power is sufficient, enabling the controller to control the microwave power supply to hold the microwave initial power for continuous rock breaking; besides, judging the relation between the microwave initial heating time and the heating time of the unstable crack growth starting point; if the microwave initial heating time is larger than or equal to the heating time of the unstable crack growth starting point, enabling the controller to control the microwave power supply to prolong the microwave heating time; if the microwave initial heating time is larger than the heating time of the unstable crack growth starting point, computing the difference between the microwave initial heating time and the heating time of the unstable crack growth starting point; if the difference between the microwave initial heating time and the heating time of the unstable crack growth starting point is smaller than or equal to the unstable crack growth time, enabling the controller to control the microwave power supply to prolong the microwave heating time; if the microwave initial heating time is larger than the heating time of the unstable crack growth starting point, computing the difference between the microwave initial heating time and the heating time of the unstable crack growth starting point; and if the difference between the microwave initial heating time and the heating time of the unstable crack growth starting point is larger than the unstable crack growth time, enabling the controller to control the microwave power supply to shorten the microwave heating time.