Sensor for measuring pressure of water in soil at bottom of dam, river and lake and measuring method

Abstract

The invention relates to a sensor for measuring the pressure of water in soil at the bottom of a dam, a river and a lake and a measuring method thereof. The sensor and the measuring method thereof are characterized in that water in the soil enters in a pressure chamber from a permeable port through a natural vesuvianite permeable membrane and acts on a 316L stainless steel film of a silicone pressure core body by permeable water pressure; the silicone pressure core body senses the pressure, converts the pressure into an electric signal and outputs the electric signal; the electric signal output by the silicone pressure core body is transmitted to an electric signal amplifying processing board and converted into a 4-20mA current signal by amplification and the voltage conversion; and the 4-20mA current signal is transmitted to a control sampling chamber by an output cable. The invention has the advantages that a thermal shrinkable jacket is thermally shrunk at the connecting part of a shell, a compression nut and the output cable to protect the root of the output cable; the sensor is processed by ICr18Ni9Ti stainless steel, so that the sensor is integrally sealed, resists the pressure and long-term corrosion of soil and water has the characteristics of favorable permeability, small size, light weight, favorable stability, high comprehensive precision, small error and the like.

Description

technical field [0001] The invention relates to a sensor for measuring water pressure in soil at the bottom of dams, rivers and lakes and a measuring method. The measuring medium is soil and mud. The sensor uses a circular columnar membrane processed by natural volcanic rock as a permeable part, which belongs to the permeable membrane. The technical field of soil water pressure sensor. Background technique [0002] There are many types of pressure sensors for measuring water at present, the main typical silicon piezoresistive sensors, the working range is 1Kpa ~ 100Mpa, the measurement medium is liquid, there are certain defects for the pressure measurement of water in viscous mud and soil; because silicon pressure The resistive sensor is a silicon microchip structure. It cannot directly measure viscous mud and water in the soil. It must be packaged in a stainless steel shell. The 316L stainless steel film with a thickness of 0.0254mm is welded as the sensing surface, and th...

AI Technical Summary

Problems solved by technology

Because the viscous mud and soil are easy to block the 316L stainless steel diaphragm sensing surface of the silicon pressure core body, and there may be hard particles in them that are easy to damage the 316L stainless steel diaphragm sensing surface, so as to affect the measurement accuracy of the sensor, it is more likely damage to the sensor, making the measurement impossible

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