Power-adjustable isolated underwater signal acquisition and processing method and circuit

Abstract

The invention discloses a power-adjustable isolated underwater signal acquisition and processing method and circuit. The circuit consists of an underwater signal cylinder and an ashore receiving box,wherein the underwater signal cylinder and the ashore receiving box are connected through an overhead steel cable, a water body and the ground to form a loop. The underwater signal cylinder comprisesa signal input processing circuit, an input signal logic constraint, a signal carrier circuit, a carrier signal logic constraint, a signal power amplification circuit, an EMC reinforced 5V power supply circuit and an EMC reinforced adjustable power supply circuit. The ashore receiving box comprises a signal receiving lightning protection circuit, an optical coupler isolation amplification circuit,a carrier rectification filter circuit, a carrier demodulation circuit, a rectification filter circuit, a signal output logic constraint, a signal output circuit and an EMC reinforced + / - 5V power supply. By means of the circuit, the method can adapt to transmission of hydrological information of different water qualities, water depths and river surface widths.

Description

technical field [0001] The invention relates to the technical field of hydrology and water resources monitoring, in particular to an isolated underwater signal acquisition and processing method and circuit with adjustable power. Background technique [0002] In the field of hydrology and water resources monitoring, in the early days, manpower on-site surveys were used to read the water gauge and measure the flow rate manually, which was not only time-consuming and labor-intensive, but also imprecise and unreliable. With the development, some electronic hydrological detection circuits have also appeared, but the current products on the market have low power, fixed frequency, weak anti-interference ability, and no isolation processing, so the detection results will be prone to errors, and the transmission distance is wide and the water depth is wide. When the signal attenuation is large, the water quality is clear, and the impedance of the water body is large, the transmission...

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Problems solved by technology

[0002] In the field of hydrology and water resources monitoring, in the early days, manpower on-site surveys were used. Manual reading of the water gauge and measurement of the flow rate was not only time-consuming and labor-intensive, but also imprecise and unreliable.

With the development, some electronic hydrological detection circuits have also appeared, but the current products on the market have low power, fixed frequency, weak anti-interference ability, and no isolation processing, so the detection results will be prone to errors, and the transmission distance is wide and the water depth is wide. When the signal attenuation is large, the water quality is clear, and the impedance of the water body is large, the transmission signal is easy to lose and other problems. Its reliability is low, and the transmission distance and depth are limited. Therefore, it can only be used for hydrological measurement in rivers with relatively ideal environmental conditions, and the environmental conditions are relatively complicated. However, there are many rivers in complex environments in practice, so it is necessary to provide a circuit that can adapt to the transmission of hydrological information of various water quality, water depth, and river surface width

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