Study Of New Vertical Pendulum Tilt Meter

Earthquake is a result of the crust medium's some special parts' energy long-term accumulations and releases suddenly under the structure strength long-term function. Therefore, in earthquake's breeding period, the earthquake gestation body medium has the deformation inevitably. The crust deformation plays an important role in the earthquake monitoring and forecast research. Many countries take the earth crust deformation as an important method for earthquake forecast.Tilt meter is one kind of basic instrument of earth tide and the earthquake research, which includes the horizontal pendulum tilt meter, the water tube tilt meter and the vertical pendulum tilt meter. The VS new vertical pendulum tilt meter has more stable mechanical body. Its bedplate uses the isosceles triangle structure, which increases the baseline length of the apparatus, as a result, the influence of install error reduces. Moreover its electric circuit is simple and reliable, it enhances the electric circuit stability, reduced the workload for debugging. In addition, the instrument uses the square-wave vibration signal produced by the NOT gate, which enhances the signal to noise ratio. The instrument uses good shielding measure, which causes the signal disturbance reduced. The main amplifier uses proportion enlargement, widening the bandwidth, recording richer earth decline information, which can be well used in the earthquake forecast.This article introduces the VS new vertical pendulum tilt meter's mechanical construction and its components, the differential capacitance displacement sensor, the calibration, pendulum dialing as well as its practical application .The main findings are as follows:(1) The VS new vertical pendulum tilt meter's main mechanical spare parts are researched. The tilt meter uses the prop pole, the adjustable prop pole using the dual horizontal positioning and horizontal cushion. The main supportuses integrated cylindrical cross-section structure which guarantees stability of the instrument's mechanical structure.(2) The bedplate uses the isosceles triangle structure, lengthening the baseline can reduce the influence of install error.(3) The high accuracy differential capacity displacement sensor is introduced in detail. Meanwhile the antijamming measure is studied.(4) The instrument's calibration method is studied. Electrostatic calibration and heavy block calibration are compared. Electrostatic calibration doesn't need calibration apparatus, its manipulation is simple, so new vertical pendulum tilt meter adopts electrostatic calibration.(5) The adjusting pendulum equipment of the VS new vertical pendulum tilt meter and the circuit of auto-adjusting pendulum are researched.(6)The operating environment and stabilizing process are studied. Using the foam cover to mantle the instrument entity can reduce inside airstreams influence on the instrument.(7) The instrument record data is analyzed. The frequency range of VS new vertical pendulum tilt meter is very wide, and the plus is great. The record earthquake information is abundant, and the record amplitude is 10 times more than others. The instrument may be used as a wide frequency range seismograph, which fills up the blank that measure cycle of the earth liberation between 120 seconds and 25 hours. It has very important meaning to the analysis and forecast the earthquake.