CN203216569U

CN203216569U - High-precision underground water level monitoring device

Info

Publication number: CN203216569U
Application number: CN 201320211892
Authority: CN
Inventors: 肖兰
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-04-24
Filing date: 2013-04-24
Publication date: 2013-09-25
Anticipated expiration: 2023-04-24

Abstract

A high-precision underground water level monitoring device comprises a water level sensing module, an I/V conversion module, a voltage dividing matching module, a master control module, a precise voltage reference module, a wireless communication module and a power module and is characterized in that the water level sensing module, the I/V conversion module, the voltage dividing matching module, the master control module and the precise voltage reference module are connected in sequence, the master control module is further connected with the wireless communication module and the power module respectively, the power module is further connected with the water level sensing module, the I/V conversion module, the voltage dividing matching module, the precise voltage reference module and the wireless communication module. The water level sensing module acquires water level data of a underground water level monitoring well, the I/V conversion module and the voltage dividing matching module converts and matches the acquired water level data, the converted and matched water level data is transmitted to the master control module, after internal A/D (analog to digital) conversion and precise voltage calibration by the precise voltage reference module, the master control module transmits the water level data through the wireless communication module to a detecting center for concentrated processing.

Description

Descend Level monitor accurately

Technical field

The utility model relates to a kind of Level monitor, descends Level monitor especially accurately.

Background technology

In geologic hazards such as landslide, it is geologic media stability analysis important referential data that the underground water SEA LEVEL VARIATION is precisely monitored.Water table measure adopts the well-digging mode usually, and sensor generally is divided into float-type and static pressure formula.Float-type is widely used, but precision high sensitivity is not poor, static pressure formula precision height but the arrangement process of signal mostly are output voltage signal and realize the I/V conversion to rear end ADC or transmission current signal through precision resistance, are converted to digital signal by ADC again.The former is subjected to the distance limit transmission range short, though latter's transmission range is longer, be easy to realize, but data fluctuations is obvious, and error is bigger than normal, and measurement effect is very undesirable.

Summary of the invention

In view of above reason, the utility model provides a kind of Level monitor that descends accurately, adopt static pressure formula level sensor to obtain underground water table information, by accurate I/V conversion, high-precision A/D conversion and high stability reference voltage, and the fitting curves approximating method, realized the high precision collecting of underground water table information.

The technical scheme that its technical matters that solves the utility model adopts is: a kind of Level monitor that descends accurately, comprise the level sensor module, the I/V modular converter, the dividing potential drop matching module, the main control module, accurate voltage reference block, wireless communication module, power module, it is characterized in that, the level sensor module, the I/V modular converter, the dividing potential drop matching module, the main control module, precisely voltage reference block connects successively, the main control module also respectively with wireless communication module, power module connects, power module also respectively with the level sensor module, the I/V modular converter, the dividing potential drop matching module, accurate voltage reference block, wireless communication module connects.The level sensor module is gathered water table measure well water bit data in real time, after I/V modular converter, dividing potential drop matching module conversion coupling, be sent to the main control module, the main control module is changed through inner A/D, and behind the accurate voltage calibration by accurate voltage reference block, by wireless communication module waterlevel data is sent to inspection center, focuses on.

The beneficial effects of the utility model are, are quick on the draw, and stable signal transmission is suitable for long distance and surveys, and can timely and effectively play the underground water table of monitoring effect, has advantages of high practicability.

Description of drawings

Fig. 1 is theory diagram of the present utility model.

Embodiment

In Fig. 1, a kind of Level monitor that descends accurately, comprise level sensor module 1, I/V modular converter 2, dividing potential drop matching module 3, main control module 4, accurate voltage reference block 5, wireless communication module 6, power module 7, it is characterized in that, level sensor module 1, I/V modular converter 2, dividing potential drop matching module 3, main control module 4, precisely voltage reference block 5 connects successively, main control module 4 also respectively with wireless communication module 6, power module 7 connects, power module 7 also respectively with level sensor module 1, I/V modular converter 2, dividing potential drop matching module 3, accurate voltage reference block 5, wireless communication module 6 connects.1 of level sensor mould is gathered water table measure well water bit data in real time, after I/V modular converter 2, dividing potential drop matching module 3 conversion couplings, be sent to main control module 4, main control module 4 is changed through inner A/D, and behind the accurate voltage calibration by accurate voltage reference block 5, by wireless communication module 6 waterlevel data is sent to inspection center, focuses on.

1 employing of level sensor module is not floated by temperature to be influenced, and it is fast that dynamic water table is changed response, the condenser type pottery static pressure sensor that the linearity is good, and the ventilation cable that employing simultaneously has the effect of balancing Atmospheric pressure carries out data transmission, with the atmospheric pressure at the offset sensor back side.I/V modular converter 2 adopts accurate I/V conversion chip RVCA20, and the 4-20mA input signal is converted into the 0-5V output signal.It comprises 1 senior operational amplifier, 1 interior precision resistance network of sheet that is used for detecting electric current, the common-mode input range that allows reaches ± 40V, can obtain common-mode rejection ratio CMR and reach 86dB under the situation that does not need outside adjustment, and gamut input impedance pressure drop is 1.5V only.Its total conversion accuracy is 0.1% in addition, also has an accurate 10V voltage reference reference source.Dividing potential drop matching module 3 adopts RCV420 to concentrate chip, output signal is 0-5V, in order to satisfy the A/D conversion of rear end, therefore after through the I/V conversion, use 2 10k electric resistance partial pressures, convert 0-2.5V voltage to, in order to improve matching capacity, adopted the 0P07 of performance height, dual power supply to form voltage follower circuit in the design, realized impedance matching.Adopt dual power supply ± 12V to give chip power supply simultaneously, and carried out filtering and decoupling design at power access end.It is main control chip that main control module 4 is selected high speed SOC single-chip microcomputer C8051F350 for use, and 24 ADC of fully differential that use single-chip microcomputer inside to have the sheet calibration function carry out data sampling, 2 independently the extraction-type wave filter may be programmed into the sampling rate of 1kHz.Precisely voltage reference block 5 adopts the CAT8900A250TBIT3 of high-accuracy voltage reference integrated circuit CAT8900 series to produce chip as the ADC reference voltage.This chip provides 2.500V output voltage, and initial precision is tall and big by 0.02%, and in great majority were used, they need not export shunt capacitance, and extremely simple peripheral circuit has been saved a large amount of PCB spaces.What wireless communication module 6 adopted is the GTM900 wireless module, and it provides a full duplex serial ports UARTO, communicates by it and main control module 4.Demand according to software design only needs two signal wires of TXD and RXD get final product at present, but considers and can detect ringdown RI and data carrier signal DCD by hardware interrupts future, so also these two pins of GTM900 are connected with main control module 4.Power module 7 adopts the power supply of 12V lead-acid accumulator.With lead-acid accumulator 12V voltage transitions ± 12V, and be I/V modular converter and matched impedance module for power supply in the circuit by the DC-DC module of the HDW3-12D12 series of ANSJ.

Claims

1. one kind is descended Level monitor accurately, comprise level sensor module (1), I/V modular converter (2), dividing potential drop matching module (3), main control module (4), accurate voltage reference block (5), wireless communication module (6), power module (7), it is characterized in that, level sensor module (1), I/V modular converter (2), dividing potential drop matching module (3), main control module (4), precisely voltage reference block (5) connects successively, main control module (4) also respectively with wireless communication module (6), power module (7) connects, power module (7) also respectively with level sensor module (1), I/V modular converter (2), dividing potential drop matching module (3), accurate voltage reference block (5), wireless communication module (6) connects.