jgg     2013 33 (5):  157-159    ISSN: 0412-1961  CN: 21-1139/TG DEVELOPMENT AND APPLICATION OF CCD TYPE BI-METAL  TUBE INSTRUMENT 1)Key Laboratory of Earthquake Geodesy, Institute of Seismology, CEA, Wuhan 430071 2)Wuhan Base of Institute Crustal Dynamics, CEA, Wuhan 430071 3)Institute of Geophysics, CEA, Beijing 100081 Received: 2012-07-30  Revised: null  Online: 2013-10-13 Supporting info