ADCP system-based external communication isolation circuit

Abstract

The invention provides an ADCP system-based external communication isolation circuit. The circuit comprises an RS232 interface chip, an RS422 interface chip, a first isolation chip, a second isolationchip, an isolated power supply chip and an MCU, wherein one end of the RS232 interface chip is connected with a PC, and the other end of the RS232 interface chip is connected with the first isolationchip; one end of the RS422 interface chip is connected with the PC, and the other end of the RS422 interface chip is connected with the second isolation chip; the first isolation chip and the secondisolation chip are connected with the MCU; and power and ground of one end of the isolated power supply chip are connected with those of one ends of the RS232 interface chip, the RS422 interface chip,the first isolation chip and the second isolation chip, and power and ground of the other end of the isolated power supply chip are connected with those of the first isolation chip, the second isolation chip and an ADCP system. Not only signals but also corresponding power and ground are isolated, so that the noise influence due to long-line communication is eliminated.

Description

technical field [0001] The invention relates to the field of water flow velocity measurement, in particular to an ADCP system-based external communication isolation circuit. Background technique [0002] ADCP, Acoustic Doppler Velocity Profiler, is a device developed based on the principle of Acoustic Doppler to measure the velocity of water body. It is mainly through the transducer to emit sound waves in the water area to be measured, and the sound waves are reflected in the water area to be measured. We calculate the water velocity by measuring the reflected sound wave signal. Therefore, when measuring the water speed, the ADCP needs to be put into the water, so that there is a long distance between the ADCP and the measuring PC terminal. At present, the mainstream ADCP in the market uses a cable of about 20 meters to communicate with each other. The communication method It is generally realized through the serial port. However, when ADCP communicates with PC terminals,...

AI Technical Summary

Problems solved by technology

However, when ADCP communicates with PC terminals, it often brings unpredictable noise to the ADCP system due to long-term communication (for example: during long-term transmission, the long cable can form an antenna effect, which will absorb the surrounding microwaves to the system. noise interference, etc.)

This will affect parameters such as ADCP system measurement accuracy

At present, some of the existing technologies do not deal with it, and some will do some processing on the system ground, or do some simple signal isolation, so as to reduce this effect but not completely eliminate it.

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