DEVELOPMENT OF THE WSQ-1 EDDY CURRENT TYPE AUTOMATIC RECORDING WATER- TUBE TILTMETER

The WSQ-1 Type Automatic Recording Water-Tube Tiltmenter is designed for continuous recording of secular ground tilt and earth tide observation.The tiltmeter has a float-arm structure. Temperature compensation has been taken into consideration in the design. The WQB-B-1000 type Electro-Eddy-current displacement transducer specially developed for the tiltmefer is a non-contact transducer with high sensibility, wide dynamic range and high stability and less requisites in direction guiding of the float. The transducer not only simplifies the structure of the tiltmeter but also ensures its good quality. The tiltmeter output represents the water level difference and sum in the two water vessels. The difference gives the tilt signals which are to be measured while the sum indicates not only of the stability of the tiltmenter but also act as signal when the it is calibrated by means of a calibrator fixed at the center of the water tube. Actual test results show that the scale value of the WQS-1 tiltmeter is better than 510-9 rad/mm (when the water tube is 30 meters long), average zero drift is better than 310-9 rad/day, measuring range is 1mm (no readjustment needed) and the accuracy of measurement of the tidal factor r reaches 0.003 (M2. 88 davs).