Research on tidal disturbance phenomenon of DSQ water tube tiltmeter at Yunnan Yanziyan observation station

The DSQ water tube tiltmeter at Yunnan Yanziyan observation station frequently records high-frequency disturbances in various components, manifested in the form of thickened observation curve pulsation, and the replacement of amplification boxes, coils, lines, data acquisition, etc. failed to eliminate this high-frequency disturbance. After comparing with actual meteorological observation data, it was found that there was a certain degree of synchronization between tidal disturbances and atmospheric pressure fluctuations. After further diagnosis, investigation, and analysis, it had been determined that the cause of high-frequency disturbance was that the bowl cover of the DSQ water tube tiltmeter lacked air pipes, resulting in independent cavities above the liquid levels at both ends of the tiltmeter. The pressure balance at both ends of the liquid level was disrupted, causing high-frequency disturbances. After punching the bowl cover, high-frequency disturbances were eliminated. The process and method of diagnosing and eliminating high-frequency disturbances are of great significance for improving the quality of solid tide observation using the DSQ water tube tiltmeter, and have reference value for improving and managing similar instruments.