Automatic measurement method and device of water level of observation well based on laser displacement sensor

Abstract

The invention discloses an automatic measurement method and device of the water level of an observation well based on a laser displacement sensor. The automatic measurement device is characterized by comprising a laser displacement sensor, a fixing support, an industrial personal computer, a measuring scale and a measurement container, wherein the measurement container comprises a measurement container body and reflecting particles, the measurement container body is a water-level observation well or a foundation-pit water-level well, the laser displacement sensor is fixedly mounted on the fixing support right above the mouth of the water-level observation well, and the laser displacement sensor is connected with the industrial personal computer in a measuring room through a communication cable. The measurement method comprises the following steps: 1) the laser displacement sensor emits a laser beam to the reflecting particles floating on the water surface of the observation well, the water level is measured according to the phase difference of the time when the laser is emitted and the time when the laser is detected, and the distance L is recorded; 2) the distance E between the mouth of the observation well and the laser displacement sensor is measured, and the difference of the distance L and the distance E is calculated so as to obtain the initial height L1 of the water level.

Description

technical field [0001] The invention relates to a method for measuring the water level of foundation pits and observation wells, and in particular discloses a method and device for automatically measuring the water level of observation wells based on laser displacement sensors, which are applied to various projects that need to monitor groundwater levels. Background technique [0002] The water level of foundation pits and observation wells has always been a relatively important research course in scientific surveys. In the history of scientific development, there have been many water level measurement methods, such as: buoy measurement method, ultrasonic reflection method, capacitive water level Measurement method, pressure sensing method of resistance strain gauge, etc. [0003] The buoy measurement method is based on the buoyancy of the buoy (also known as the buoy) floating on the liquid surface, which is affected by the buoyancy of the water, and the displacement is gen...

AI Technical Summary

Problems solved by technology

The current shortcomings of ultrasonic reflection level gauges have certain blind spots, and the price is relatively expensive

[0006] In addition, the frequency meter method is used, but due to the need to adopt analog circuit and digital circuit technology, it requires a lot of hardware, complex circuits, and poor stability. The test accuracy, reliability, and stability cannot meet the needs of field projects.

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