1. Key Laboratory of Geo-exploration Instruments, Ministry of Education, Jilin University, Changchun 130021, China
2. Key Laboratory of Geo-exploration Technologies and Instruments, Ministry of Land and Resources, Jilin University, Changchun 130021, China
3. College of Instrumentation and Electrical Engineering, Jilin University, Changchun 130021, China
4. Xuzhou Heavy Machinery Co. Ltd., No. 165, Tongshan Road, 221004 Xuzhou, China