CN112255379B - Signal processing circuit and processing method based on river water quality automatic monitoring system - Google Patents
Signal processing circuit and processing method based on river water quality automatic monitoring system Download PDFInfo
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Abstract
The invention relates to the field of automatic water quality monitoring systems, and discloses a signal processing circuit and a signal processing method based on an automatic river water quality monitoring system, which comprise the following steps: the system comprises a water quality detection unit, a signal conditioning unit, a transfer control unit, a wireless transmission unit, a signal cache unit and a control unit; wherein, signal conditioning unit includes: the device comprises an I/V conversion module, a signal amplification module and a filtering output module; the river is provided with a plurality of sub-detection nodes, each sub-detection node is provided with a water quality index sensor and a flow sensor, a detection signal is subjected to signal conversion in a signal processing module, a signal amplification module is used for carrying out primary amplification and secondary amplification of the signal, a follower is used for buffering and isolating the signal, the bearing capacity is improved, and finally clutter in the signal can be eliminated through a filtering output module, so that the stability and the accuracy of the detection signal can be effectively improved.
Description
Technical Field
The invention relates to the field of automatic water quality monitoring systems, and discloses a signal processing circuit and a signal processing method based on an automatic river water quality monitoring system.
Background
Water is a source of life, and human beings can not keep water every moment in survival and development. The total amount of surface water resources in China ranks the sixth in the world, but the total population in China is huge, so that the per-capita water resource amount only reaches the average level in the world; in addition, water resource distribution in China is seriously uneven, the total discharge amount of domestic sewage and industrial wastewater is huge, and the water environment problem troubles the national environmental protection department for a long time.
The water environment refers to the environment of water quality such as lakes, rivers, oceans and the like, and the change of the water environment can seriously affect the water quality. Whether the water environment is polluted or not is judged by detecting the physical property and the chemical property of the water quality. The water environment is an integral part of the ecological system and is a dependence for the survival and development of human beings, however, with the improvement of human science and technology, the water environment is increasingly polluted.
The automatic water quality monitoring technology is rapidly developed in China, and after construction for over ten years, the national environmental management department has realized automatic real-time monitoring and control on the water quality of the rivers in the big rivers of the big rivers in China, and all the provinces and cities build automatic monitoring systems for the water quality of water bodies in the jurisdictions and also build automatic monitoring stations for water environment ecological compensation, monitoring water environment pollution treatment of key drainage areas to reach the standard and monitoring the water quality of drinking water source areas in a targeted manner.
When the automatic water quality monitoring system in the prior art is used for river water quality detection, noise can be generated due to the difference between the weather condition and the water flow speed, so that the interference on the transmission of water quality detection signals is increased, the detection accuracy is reduced, and meanwhile, when the transmission of detection signals is carried out, the transmission signals can interfere due to the difference of transmission signal frequencies, so that the transmission rate is reduced.
Disclosure of Invention
The purpose of the invention is as follows: provides a signal processing circuit and a processing method based on an automatic river water quality monitoring system, which aim to solve the problems.
The technical scheme is as follows: a signal processing circuit based on river water quality automatic monitoring system includes:
the water quality detection unit is used for detecting the hydrogen ion concentration index, the conductivity index, the dissolved oxygen index and the water flow speed index of the river water quality;
the signal conditioning unit is used for adjusting various detection signals of the water quality, so that the transmission of the detection signals is more stable;
the transfer control unit is used for comparing the water quality at the moment, and when the water quality does not accord with the working standard, the transfer control unit directly transmits a water quality detection signal to the control unit; when the quality of the water quality meets the working standard, comparing the water flow speeds; when the water flow speed exceeds the working threshold value, directly transmitting a water flow speed detection signal to a signal cache unit;
the wireless transmission unit is used for performing wireless transmission on the detection signals and respectively performing transmission of an upper layer and a lower layer, the upper layer signals are transmitted to the control unit, and the lower layer signals are transmitted to the signal cache unit;
the signal caching unit is used for buffering and storing water flow velocity detection signals and transmitting detection indexes of different water flow velocities at different times to the Internet of things cloud system;
the control unit is used for receiving the water quality detection signal and analyzing the signal so as to transmit the signal to the control terminal, and meanwhile, the time base sequence is used for sending an untimed working instruction to the sensor;
wherein, signal conditioning unit includes: the device comprises an I/V conversion module, a signal amplification module and a filtering output module.
In one embodiment, the I/V conversion module includes: a resistor R1, a resistor R2, a resistor R3, a resistor R4, a triode Q1, an amplifier U1A, a resistor R5, a resistor R6, a resistor R7, a capacitor C1, a diode D1, a diode D2, an amplifier U2A, a resistor R11, a resistor R8, a resistor R9, a resistor R10, a capacitor C2, a triode Q2, a voltage regulator tube D3, a reference voltage regulator source U3 and a reference voltage regulator source U4;
one end of the resistor R2 is connected to one end of the resistor R3 and receives a signal, an emitter of the transistor Q1 is connected to the other end of the resistor R2 and one end of the resistor R1 at the same time, the pin No. 2 of the amplifier U1A is connected to the other end of the resistor R1, the pin No. 1 of the amplifier U1A is connected to a base of the transistor Q1, the pin No. 3 of the amplifier U1A is connected to one end of the resistor R5, one end of the resistor R7 is connected to the other end of the resistor R5 and one end of the resistor R6 at the same time, the other end of the resistor R7 is grounded, a collector of the transistor Q1 is connected to one end of the resistor R9, one end of the capacitor C1 is connected to the other end of the resistor R3 and a cathode of the diode D2 at the same time, the other end of the capacitor C1 is connected to an anode of the diode D2 and grounded, and an anode of the diode D1 is connected to the cathode of the amplifier U A and the pin No. 2 of the diode D The pin 1 of the amplifier U2A is connected to one end of the capacitor C2 and the base of the transistor Q2, the pin 2 of the amplifier U2A is connected to the other end of the capacitor C2 and the emitter of the transistor Q2 and grounded, the pin 4 of the amplifier U2A is connected to the pin 4 of the amplifier U1A, the other end of the resistor R6, one end of the resistor R8 and the pin 3 of the reference regulator U3, the pin 8 of the amplifier U2U 42 is connected to the pin 8 of the amplifier U1A, one end of the resistor R11 and the pin 1 of the reference regulator U4 and receives an operating voltage, the pin 1 of the reference regulator U3 is connected to one end of the resistor R9, one end of the resistor R10 and the pin 3 of the reference regulator U3, the pin 2 of the reference regulator U5 is connected to the other end of the resistor R9 and the other end of the resistor R3557324 and grounded, the other end of the resistor R10 is connected with the other end of the resistor R4 and inputs voltage, a No. 2 pin of the reference voltage regulator U4 is connected with the other end of the resistor R11 and the anode of the voltage regulator tube D3, a No. 3 pin of the reference voltage regulator U4 is connected with the cathode of the voltage regulator tube D3 and the No. 1 pin of the reference voltage regulator U3 and grounded, and a collector of the triode Q2 outputs signals.
In one embodiment, the signal amplification module comprises: the circuit comprises a resistor R13, a resistor R14, a resistor R15, a resistor R12, a resistor R16, a resistor R18, a resistor R17, an adjustable resistor RV1, an amplifier U5A, an amplifier U6A, an amplifier U7A and a capacitor C3;
wherein, pin No. 2 of the amplifier U5A is connected to one end of the resistor R13 and one end of the resistor R12 at the same time, pin No. 3 of the amplifier U5A is connected to one end of the resistor R14 and one end of the resistor R15 at the same time, a signal is input to the other end of the resistor R13, a reference voltage is input to the other end of the resistor R14, the other end of the resistor R15 is grounded, pin No. 1 of the amplifier U5A is connected to the other end of the resistor R12 and one end of the resistor R16 at the same time, pin No. 2 of the amplifier U6A is connected to the other end of the resistor R16 and one end of the adjustable resistor RV1 at the same time, pin No. 3 of the amplifier U6A is connected to one end of the resistor R18, the other end of the resistor R18 is grounded, pin No. 1 of the amplifier U6A is connected to one end of the resistor R539r 17 and the control end of the adjustable resistor RV1 and the other end, no. 8 pin of amplifier U6A with the one end of electric capacity C3 is connected and input voltage, the other end of electric capacity C3 is connected, No. 4 pin ground of amplifier U6A, No. 3 pin of amplifier U7A with the other end of resistance R17 is connected, No. 1 pin and No. 2 pin of amplifier U7A are connected and are exported.
In one embodiment, the filter output module includes: a capacitor C9, a capacitor C8, a resistor R19, a capacitor C5, a capacitor C4, a diode D7, a diode D6, an operational amplifier U8A, a diode D4, a diode D5, a capacitor C7, a capacitor C6, a capacitor C10, a capacitor C11, a diode D9, a diode D8 and an operational amplifier U8B;
wherein, pin No. 3 of the operational amplifier U8A is connected to one end of the capacitor C8 and one end of the resistor R19, pin No. 2 of the operational amplifier U8A is connected to the anode of the diode D7 and the anode of the diode D6, pin No. 4 of the operational amplifier U8A is connected to one end of the capacitor C4 and inputs voltage, pin No. 8 of the operational amplifier U8A is connected to one end of the capacitor C5 and inputs signal, the other end of the capacitor C4 is grounded, the other end of the capacitor C5 is grounded, the other end of the resistor R19 is connected to one end of the capacitor C9 and inputs signal, the other end of the capacitor C8 is grounded, the cathode of the diode D7 is grounded, the cathode of the diode D7 is connected to the other end of the capacitor C9, pin No. 1 of the operational amplifier U8A is connected to the anode of the diode D4, the negative electrode of the diode D4 is connected to both one end of the capacitor C7 and the positive electrode of the diode D5, the pin No. 5 of the operational amplifier U8B is connected to both one end of the capacitor C6 and the negative electrode of the diode D5, the pin No. 6 of the operational amplifier U8B is connected to both the positive electrode of the diode D9 and the positive electrode of the diode D8, the negative electrode of the diode D9 is grounded, the pin No. 8 of the operational amplifier U8B has one end of the capacitor C10 connected to input voltage, the pin No. 4 of the operational amplifier U8B is connected to both one end of the capacitor C11 to input voltage, the other end of the capacitor C10 is grounded, the other end of the capacitor C11 is grounded, and the negative electrode of the diode D8 is connected to both ends of the capacitor C7 to output signals.
In one embodiment, the reference voltage supply U3 and the reference voltage supply U4 are both model numbers TL 431.
In one embodiment, in the wireless transmission unit, when the detection signal data of each time period is collected for transmission, the collected signals are simultaneously transmitted to the control unit and the signal buffer unit, and two separate transmission channels are adopted for transmission, so that mutual interference is avoided.
A processing method of a signal processing circuit based on an automatic river water quality monitoring system is characterized in that a water quality detection unit carries out detection signals by using a sensor arranged in a river, and simultaneously, a flow sensor in water also carries out detection on the current speed so as to process the detection signals; the method comprises the following specific steps:
step 1, firstly, each monitoring base station monitors the river water quality condition at a certain distance, meanwhile, each section of river is provided with a plurality of sub-detection nodes, each sub-detection node is provided with a water quality index sensor and a flow sensor, detection signals are transmitted to a transfer control unit for data comparison, and then according to the difference of data comparison, the detection signals are transmitted to a control unit by a wireless transmission unit, so that the next step of instruction sending is carried out;
and 4, simultaneously, carrying out signal conversion on the water flow velocity signal transmitted to the control unit through the upper transmission layer through the control unit, processing and simultaneously transmitting the water flow velocity signal to the control terminal, and making signal processing work by staff through the flow velocity at the moment.
In one embodiment, when calculating the river water flow velocity, the period between two continuous pulse rising edges output by the flow sensor is measured to obtain the frequency, and then the water flow velocity and the volume are calculated, so that the transit control unit judges whether the current flow velocity affects the signal transmission, and the specific steps are as follows: step 5, when the flow rate is larger than the working range at the moment, directly carrying out primary flow rate detection calculation, and when the average value of the sum of the two detection signal calculations is larger than the working range, transmitting the data of the maximum flow rate, and carrying out upper and lower layered transmission through the wireless transmission unit;
and 6, when the first flow velocity detection calculation is smaller than the working range at the moment, the river flow velocity is in a normal working state at the moment, and the collected flow velocity data is directly transmitted to the signal buffer unit through a lower transmission layer of the wireless transmission unit.
Has the advantages that: when the river water quality detection is carried out, due to the fact that the weather condition and the water flow speed are different, noise is generated, interference on water quality detection signal transmission is increased, and detection accuracy is reduced; meanwhile, when the multiple detection data are all in accordance with the working standard, the subsequent detection frequency is disturbed for several times, and the detection is not carried out at the same frequency time, so that the detection accuracy can be greatly improved.
Drawings
FIG. 1 is a flow chart of the operation of the present invention.
Fig. 2 is a schematic diagram of a signal conditioning unit of the present invention.
FIG. 3 is a circuit diagram of the I/V conversion module of the present invention.
Fig. 4 is a circuit diagram of a signal amplification module of the present invention.
Fig. 5 is a circuit diagram of the filter output module of the present invention.
FIG. 6 is a schematic view of water quality monitoring according to the present invention.
FIG. 7 is a flow chart of a processing method of the present invention.
Detailed Description
As shown in fig. 1, in this embodiment, a signal processing circuit and a signal processing method based on an automatic river water quality monitoring system includes: the device comprises a water quality detection unit, a signal conditioning unit, a transfer control unit, a wireless transmission unit, a signal caching unit and a control unit.
As shown in fig. 2, the signal conditioning unit includes: the device comprises an I/V conversion module, a signal amplification module and a filtering output module.
As shown in fig. 3, the I/V conversion module includes: the voltage regulator comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a triode Q1, an amplifier U1A, a resistor R5, a resistor R6, a resistor R7, a capacitor C1, a diode D1, a diode D2, an amplifier U2A, a resistor R11, a resistor R8, a resistor R9, a resistor R10, a capacitor C2, a triode Q2, a voltage regulator tube D3, a reference voltage regulator U3 and a reference voltage regulator U4.
As shown in fig. 4, the signal amplification module includes: the circuit comprises a resistor R13, a resistor R14, a resistor R15, a resistor R12, a resistor R16, a resistor R18, a resistor R17, an adjustable resistor RV1, an amplifier U5A, an amplifier U6A, an amplifier U7A and a capacitor C3.
As shown in fig. 5, the filtering output module includes: the circuit comprises a capacitor C9, a capacitor C8, a resistor R19, a capacitor C5, a capacitor C4, a diode D7, a diode D6, an operational amplifier U8A, a diode D4, a diode D5, a capacitor C7, a capacitor C6, a capacitor C10, a capacitor C11, a diode D9, a diode D8 and an operational amplifier U8B.
In a further embodiment, one end of the resistor R2 is connected to one end of the resistor R3 and receives a signal, an emitter of the transistor Q1 is connected to the other end of the resistor R2 and one end of the resistor R1 at the same time, pin No. 2 of the amplifier U1A is connected to the other end of the resistor R1, pin No. 1 of the amplifier U1A is connected to a base of the transistor Q1, pin No. 3 of the amplifier U1A is connected to one end of the resistor R5, one end of the resistor R7 is connected to the other end of the resistor R5 and one end of the resistor R6 at the same time, the other end of the resistor R7 is grounded, a collector of the transistor Q1 is connected to one end of the resistor R4, one end of the capacitor C1 is connected to the other end of the resistor R3 and a cathode of the diode D2 at the same time, and the other end of the capacitor C1 is connected to the anode of the diode D2 and grounded, the anode of the diode D1 is connected with the cathode of the diode D2 and the pin No. 3 of the amplifier U2A at the same time, the pin No. 1 of the amplifier U2A is connected with one end of the capacitor C2 and the base of the transistor Q2 at the same time, the pin No. 2 of the amplifier U2A is connected with the other end of the capacitor C2 and the emitter of the transistor Q2 and grounded, the pin No. 4 of the amplifier U2A is connected with the pin No. 4 of the amplifier U1A, the other end of the resistor R6, one end of the resistor R8 and the pin No. 3 of the reference regulator U3 at the same time, the pin No. 8 of the amplifier U2A is connected with the pin No. 8 of the amplifier U1A, one end of the resistor R11 and the pin No. 1 of the reference regulator U4 at the same time and an operating voltage is input, the pin No. 1 of the reference regulator U3 is connected with one end of the resistor R5, one end of the resistor R10 and the pin No. 3 of the reference regulator U5733, the No. 2 pin of the reference voltage-stabilizing source U3 is connected with the other end of the resistor R8 and the other end of the resistor R9 at the same time and is grounded, the other end of the resistor R10 is connected with the other end of the resistor R4 and inputs voltage, the No. 2 pin of the reference voltage-stabilizing source U4 is connected with the other end of the resistor R11 and the anode of the voltage-stabilizing tube D3 at the same time, the No. 3 pin of the reference voltage-stabilizing source U4 is connected with the cathode of the voltage-stabilizing tube D3 and the No. 1 pin of the reference voltage-stabilizing source U3 at the same time and is grounded, and the collector of the triode Q2 outputs signals.
In a further embodiment, pin No. 2 of the amplifier U5A is connected to one end of the resistor R13 and one end of the resistor R12, pin No. 3 of the amplifier U5A is connected to one end of the resistor R14 and one end of the resistor R15, the other end of the resistor R13 is connected to an input signal, the other end of the resistor R14 is connected to a reference voltage, the other end of the resistor R15 is grounded, pin No. 1 of the amplifier U5A is connected to the other end of the resistor R12 and one end of the resistor R16, pin No. 2 of the amplifier U6A is connected to the other end of the resistor R16 and one end of the adjustable resistor RV1, pin No. 3 of the amplifier U6A is connected to one end of the resistor R18, the other end of the resistor R18 is grounded, pin No. 1 of the amplifier U6A is connected to one end of the resistor R17 and one end of the adjustable resistor R1 and a control terminal of the adjustable resistor RV1, The other end is connected, No. 8 pin of amplifier U6A with the one end of electric capacity C3 is connected and input voltage, the other end of electric capacity C3 is connected, No. 4 pin ground connection of amplifier U6A, No. 3 pin of amplifier U7A with the other end of resistance R17 is connected, No. 1 pin and No. 2 pin of amplifier U7A are connected and are exported.
In a further embodiment, pin No. 3 of the operational amplifier U8A is connected to one end of the capacitor C8 and one end of the resistor R19 at the same time, pin No. 2 of the operational amplifier U8A is connected to the anode of the diode D7 and the anode of the diode D6 at the same time, pin No. 4 of the operational amplifier U8A is connected to one end of the capacitor C4 and inputs a voltage, pin No. 8 of the operational amplifier U8A is connected to one end of the capacitor C5 and inputs a signal, the other end of the capacitor C4 is grounded, the other end of the capacitor C5 is grounded, the other end of the resistor R19 is connected to one end of the capacitor C9 and inputs a signal, the other end of the capacitor C8 is grounded, the cathode of the diode D7 is grounded, the cathode of the diode D7 is connected to the other end of the capacitor C9, pin No. 1 of the operational amplifier U8A is connected to the anode of the diode D4, the negative electrode of the diode D4 is connected to both one end of the capacitor C7 and the positive electrode of the diode D5, the pin No. 5 of the operational amplifier U8B is connected to both one end of the capacitor C6 and the negative electrode of the diode D5, the pin No. 6 of the operational amplifier U8B is connected to both the positive electrode of the diode D9 and the positive electrode of the diode D8, the negative electrode of the diode D9 is grounded, the pin No. 8 of the operational amplifier U8B has one end of the capacitor C10 connected to input voltage, the pin No. 4 of the operational amplifier U8B is connected to both one end of the capacitor C11 to input voltage, the other end of the capacitor C10 is grounded, the other end of the capacitor C11 is grounded, and the negative electrode of the diode D8 is connected to both ends of the capacitor C7 to output signals.
In a further embodiment, the invention has an abnormal processing mode, when the water flow quality detection and the water flow speed detection are carried out, the water quality detection signal and the water speed detection signal are subjected to signal stabilization through the signal processing unit and are simultaneously transmitted to the transfer control unit, the water quality detection signal is compared through the interior of the transfer control unit, and when the water quality does not meet the standard, the water quality detection signal is directly transmitted to the control unit through an upper transmission layer in the wireless transmission unit; when the quality of the water quality meets the working standard, the water speed is detected and input into a transfer control unit, so that the water speed is compared; when the water flow speed exceeds the working threshold value, the water flow speed detection signal is directly transmitted to the signal cache unit, when the water flow speed accords with the working threshold value, the water quality detection signal and the water flow speed detection signal are transmitted to the control unit, and the control unit can detect the time frequency and carry out irregular detection frequency.
In a further embodiment, when the detected water quality signal and the detected water flow velocity signal both meet the working index in multiple detections, the control unit sends out a detection timing sequence, and when the water quality detection unit performs detection every ten minutes, and when the water quality and the water flow velocity both meet the standards in five detections, the control unit performs one to five water quality and water velocity detections immediately after the fifth detection is completed, so as to ensure that in a detection interval, if sewage is injected, timely detection can be performed, and thus the accuracy of water quality detection can be ensured.
The working principle is as follows: when the water flow speed is overlarge, the detected water quality signal can be processed by the signal processing unit, firstly the signal is converted into a voltage signal by an I/V module, the voltage is input into a reference voltage-stabilizing source U3 by a resistor R10, so that the reference voltage-stabilizing source U3 outputs a stable voltage to the non-inverting input end of an amplifier U1A, wherein the resistor R6 and a resistor R7 are subjected to voltage division input, the resistor R5 is matched, meanwhile, the output end of the amplifier U1A is connected with the base of a triode Q1 so as to buffer the voltage and increase the output capacity, the detection signal is input by a resistor R3, and is protected by an input capacitor C1, a diode D1 and a diode D2 so as to prevent the working voltage from being overlarge and the conducting signal from being disordered and simultaneously input to the non-inverting end of an amplifier U2A so as to be converted, and finally, the output value is output to the triode Q2 by the output end of the amplifier U2A, the capacitor C2 filters, so that the filtered signal is output to the signal amplification module through the collector of the triode Q2;
the input signal is subjected to primary amplification through an amplifier U5A, then is subjected to secondary amplification through an amplifier U6A, meanwhile, the secondary amplification factor can be modulated through an adjustable resistor RV1, finally, the output voltage is obtained through the amplifier U7A serving as a follower, after a power supply is switched on, the input signal voltage is amplified to obtain the output voltage, the input voltage and the output voltage waveform are recorded, data are transmitted to a control unit, the amplification factor is obtained through calculation, and data caching is carried out;
the input signal is protected and input through a resistor R13, and the reference voltage is input through a voltage division circuit formed by a resistor R14 and a resistor R15, so that the input signal is amplified by one time to five times; meanwhile, the amplifier U5A not only amplifies signals, but also can filter some noise signals on the circuit, thereby reducing further amplification of the noise by a post-stage circuit, and further increasing the voltage of an input signal and outputting the signal; therefore, a signal is input to the secondary operational amplifier circuit for amplification through the resistor R16, in order to improve the input impedance and common mode rejection performance of the preamplifier circuit and reduce output noise, an in-phase amplifier circuit is adopted to ensure undistorted amplification as much as possible so as to ensure that the linear amplification performance of each stage is fully exerted and the bandwidth requirement is met, thereby ensuring no distortion, namely achieving high-fidelity amplification quality; finally, the signal is input into an amplifier U7A through a resistor R17, wherein the amplifier U7A is used as a follower, and the buffer and isolation of the follower improve the bearing capacity; the common collector circuit has high input impedance and low output impedance, so that the common collector circuit can play a role in circuit impedance matching and can be used as a better amplifying circuit; when the input impedance is very high, the front-stage circuit is opened; when the output impedance is low, the rear-stage circuit is equivalent to a voltage source, and the output voltage is not influenced by the circuit impedance; the first stage circuit is equivalent to open-circuit voltage output, and is not influenced by impedance after horizontal shock insulation effect exists, so that the front stage circuit and the rear stage circuit are not influenced by each other;
meanwhile, signals are output to the filtering output module through the amplifying circuit, a fourth-order Butterworth filter circuit is formed by the operational amplifier U8A and the operational amplifier U8B, the signals are input to the operational amplifier U8A through a peak voltage absorption branch circuit formed by the capacitor C9 and the resistor R19, primary filtering is conducted at the moment, the signals are conducted and output to the operational amplifier U8B through the diode D4, secondary filtering is conducted, finally, the signals are output through the operational amplifier U8B, and the signals are transmitted to the control unit and the signal cache unit through the wireless transmission unit, so that signal conversion and data storage are conducted.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.
Claims (8)
1. A signal processing circuit based on river water quality automatic monitoring system, characterized by, includes:
the water quality detection unit is used for detecting the hydrogen ion concentration index, the conductivity index, the dissolved oxygen index and the water flow speed index of the river water quality;
the signal conditioning unit is used for adjusting various detection signals of the water quality, so that the transmission of the detection signals is more stable;
the transfer control unit is used for comparing the water quality at the moment, and when the water quality does not accord with the working standard, the transfer control unit directly transmits a water quality detection signal to the control unit; when the quality of the water quality meets the working standard, comparing the water flow speeds; when the water flow speed exceeds the working threshold value, directly transmitting a water flow speed detection signal to a signal cache unit; when the water flow speed accords with the working threshold, the water quality detection signal and the water speed detection signal are transmitted to the control unit, and the control unit detects the time frequency and carries out irregular detection frequency;
the wireless transmission unit is used for performing wireless transmission on the detection signals and respectively performing transmission of an upper layer and a lower layer, the upper layer signals are transmitted to the control unit, and the lower layer signals are transmitted to the signal cache unit;
the signal caching unit is used for buffering and storing water flow velocity detection signals and transmitting detection indexes of different water flow velocities at different times to the Internet of things cloud system;
the control unit is used for receiving the water quality detection signal and analyzing the signal so as to transmit the signal to the control terminal, and meanwhile, the time base sequence is used for sending an untimed working instruction to the sensor;
wherein, signal conditioning unit includes: the device comprises an I/V conversion module, a signal amplification module and a filtering output module.
2. The signal processing circuit of the river water quality automatic monitoring system according to claim 1, wherein the I/V conversion module comprises: a resistor R1, a resistor R2, a resistor R3, a resistor R4, a triode Q1, an amplifier U1A, a resistor R5, a resistor R6, a resistor R7, a capacitor C1, a diode D1, a diode D2, an amplifier U2A, a resistor R11, a resistor R8, a resistor R9, a resistor R10, a capacitor C2, a triode Q2, a voltage regulator tube D3, a reference voltage regulator source U3 and a reference voltage regulator source U4;
one end of the resistor R2 is connected to one end of the resistor R3 and receives a signal, an emitter of the transistor Q1 is connected to the other end of the resistor R2 and one end of the resistor R1 at the same time, the pin No. 2 of the amplifier U1A is connected to the other end of the resistor R1, the pin No. 1 of the amplifier U1A is connected to a base of the transistor Q1, the pin No. 3 of the amplifier U1A is connected to one end of the resistor R5, one end of the resistor R7 is connected to the other end of the resistor R5 and one end of the resistor R6 at the same time, the other end of the resistor R7 is grounded, a collector of the transistor Q1 is connected to one end of the resistor R9, one end of the capacitor C1 is connected to the other end of the resistor R3 and a cathode of the diode D2 at the same time, the other end of the capacitor C1 is connected to an anode of the diode D2 and grounded, and an anode of the diode D1 is connected to the cathode of the amplifier U A and the pin No. 2 of the diode D A The pin 1 of the amplifier U2A is connected to one end of the capacitor C2 and the base of the transistor Q2, the pin 2 of the amplifier U2A is connected to the other end of the capacitor C2 and the emitter of the transistor Q2 and grounded, the pin 4 of the amplifier U2A is connected to the pin 4 of the amplifier U1A, the other end of the resistor R6, one end of the resistor R8 and the pin 3 of the reference regulator U3, the pin 8 of the amplifier U2U 42 is connected to the pin 8 of the amplifier U1A, one end of the resistor R11 and the pin 1 of the reference regulator U4 and receives an operating voltage, the pin 1 of the reference regulator U3 is connected to one end of the resistor R9, one end of the resistor R10 and the pin 3 of the reference regulator U3, the pin 2 of the reference regulator U5 is connected to the other end of the resistor R9 and the other end of the resistor R3557324 and grounded, the other end of the resistor R10 is connected with the other end of the resistor R4 and inputs voltage, a No. 2 pin of the reference voltage regulator U4 is connected with the other end of the resistor R11 and the anode of the voltage regulator tube D3, a No. 3 pin of the reference voltage regulator U4 is connected with the cathode of the voltage regulator tube D3 and the No. 1 pin of the reference voltage regulator U3 and grounded, and a collector of the triode Q2 outputs signals.
3. The signal processing circuit based on the river water quality automatic monitoring system according to claim 1, wherein the signal amplification module comprises: the circuit comprises a resistor R13, a resistor R14, a resistor R15, a resistor R12, a resistor R16, a resistor R18, a resistor R17, an adjustable resistor RV1, an amplifier U5A, an amplifier U6A, an amplifier U7A and a capacitor C3;
wherein, pin No. 2 of the amplifier U5A is connected to one end of the resistor R13 and one end of the resistor R12 at the same time, pin No. 3 of the amplifier U5A is connected to one end of the resistor R14 and one end of the resistor R15 at the same time, a signal is input to the other end of the resistor R13, a reference voltage is input to the other end of the resistor R14, the other end of the resistor R15 is grounded, pin No. 1 of the amplifier U5A is connected to the other end of the resistor R12 and one end of the resistor R16 at the same time, pin No. 2 of the amplifier U6A is connected to the other end of the resistor R16 and one end of the adjustable resistor RV1 at the same time, pin No. 3 of the amplifier U6A is connected to one end of the resistor R18, the other end of the resistor R18 is grounded, pin No. 1 of the amplifier U6A is connected to one end of the resistor R539r 17 and the control end of the adjustable resistor RV1 and the other end, no. 8 pin of amplifier U6A with the one end of electric capacity C3 is connected and input voltage, the other end of electric capacity C3 is connected, No. 4 pin ground of amplifier U6A, No. 3 pin of amplifier U7A with the other end of resistance R17 is connected, No. 1 pin and No. 2 pin of amplifier U7A are connected and are exported.
4. The signal processing circuit of the river water quality automatic monitoring system according to claim 1, wherein the filtering output module comprises: a capacitor C9, a capacitor C8, a resistor R19, a capacitor C5, a capacitor C4, a diode D7, a diode D6, an operational amplifier U8A, a diode D4, a diode D5, a capacitor C7, a capacitor C6, a capacitor C10, a capacitor C11, a diode D9, a diode D8 and an operational amplifier U8B;
wherein, pin No. 3 of the operational amplifier U8A is connected to one end of the capacitor C8 and one end of the resistor R19, pin No. 2 of the operational amplifier U8A is connected to the anode of the diode D7 and the anode of the diode D6, pin No. 4 of the operational amplifier U8A is connected to one end of the capacitor C4 and inputs voltage, pin No. 8 of the operational amplifier U8A is connected to one end of the capacitor C5 and inputs signal, the other end of the capacitor C4 is grounded, the other end of the capacitor C5 is grounded, the other end of the resistor R19 is connected to one end of the capacitor C9 and inputs signal, the other end of the capacitor C8 is grounded, the cathode of the diode D7 is grounded, the cathode of the diode D7 is connected to the other end of the capacitor C9, pin No. 1 of the operational amplifier U8A is connected to the anode of the diode D4, the negative electrode of the diode D4 is connected to both one end of the capacitor C7 and the positive electrode of the diode D5, the pin No. 5 of the operational amplifier U8B is connected to both one end of the capacitor C6 and the negative electrode of the diode D5, the pin No. 6 of the operational amplifier U8B is connected to both the positive electrode of the diode D9 and the positive electrode of the diode D8, the negative electrode of the diode D9 is grounded, the pin No. 8 of the operational amplifier U8B has one end of the capacitor C10 connected to input voltage, the pin No. 4 of the operational amplifier U8B is connected to both one end of the capacitor C11 to input voltage, the other end of the capacitor C10 is grounded, the other end of the capacitor C11 is grounded, and the negative electrode of the diode D8 is connected to both ends of the capacitor C7 to output signals.
5. The signal processing circuit based on the river water quality automatic monitoring system according to claim 2, wherein the reference voltage regulator U3 and the reference voltage regulator U4 are both TL431 in type.
6. The signal processing circuit of claim 1, wherein in the wireless transmission unit, when the detection signal data of each time period is collected and transmitted, the collected signal is simultaneously transmitted to the control unit and the signal buffer unit, and two separate transmission channels are adopted for transmission, so that mutual interference is avoided.
7. A processing method of a signal processing circuit based on an automatic river water quality monitoring system according to any one of claims 2 to 6, wherein the water quality detecting means performs processing of a detection signal by detecting a detection signal by a sensor provided in a river and by detecting a current velocity at the time by a flow sensor in water; the method comprises the following specific steps:
step 1, firstly, each monitoring base station monitors the river water quality condition at a certain distance, meanwhile, each section of river is provided with a plurality of sub-detection nodes, each sub-detection node is provided with a water quality index sensor and a flow sensor, detection signals are transmitted to a transfer control unit for data comparison, and then according to the difference of data comparison, the detection signals are transmitted to a control unit by a wireless transmission unit, so that the next step of instruction sending is carried out;
step 2, when water quality detection is carried out, the flow sensor on each sub-detection node can carry out detection on the water flow speed at the moment, a water flow speed detection signal is transmitted to the transfer control unit for data comparison, when the water flow speed is overlarge, a comparison signal is transmitted to the signal cache unit through the lower transmission layer in the wireless transmission unit, and the upper transmission layer is transmitted to the control unit;
step 3, identifying and matching the data transmitted to the signal cache unit, converting a data analog signal into a digital signal to match the data, eliminating the matching when the data in the database is newly matched with the data received at the moment to directly transmit old data information, storing the data to the signal cache unit when the data is newly matched with the data received at the moment, and transmitting the data to the internet of things cloud system through the wireless transmission unit;
and 4, simultaneously, carrying out signal conversion on the water flow velocity signal transmitted to the control unit through the upper transmission layer through the control unit, processing and simultaneously transmitting the water flow velocity signal to the control terminal, and making signal processing work by staff through the flow velocity at the moment.
8. The processing method of the signal processing circuit based on the river water quality automatic monitoring system according to the claim 7, characterized in that when calculating the river water flow speed, the period between two continuous pulse rising edges output from the flow sensor is measured to obtain the frequency, and then the water flow speed and the volume are calculated, so that the transit control unit judges whether the current flow speed affects the signal transmission, the specific steps are as follows:
step 5, when the flow rate is larger than the working range at the moment, directly carrying out flow rate detection calculation once again, and when the average value of the sum of the two detection signal calculations is larger than the working range, transmitting the data of the maximum flow rate, and carrying out upper and lower layered transmission through the wireless transmission unit;
and 6, when the first flow velocity detection calculation is smaller than the working range at the moment, the river flow velocity is in a normal working state at the moment, and the collected flow velocity data is directly transmitted to the signal buffer unit through a lower transmission layer of the wireless transmission unit.
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| CN202010778020.7A CN112255379B (en) | 2020-08-05 | 2020-08-05 | Signal processing circuit and processing method based on river water quality automatic monitoring system |
| PCT/CN2020/107882 WO2022027615A1 (en) | 2020-08-05 | 2020-08-07 | Automatic river water quality monitoring system-based signal processing circuit and processing method |
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| DE202022101095U1 (en) | 2022-02-25 | 2022-03-16 | Shazia ALI | Intelligent integrated monitoring system for measuring water quality based on IoT sensors |
| CN114942310A (en) * | 2022-04-11 | 2022-08-26 | 湛江幼儿师范专科学校(岭南师范学院基础教育学院) | Unmanned ship for water quality monitoring and water quality monitoring system |
| CN115372574A (en) * | 2022-08-17 | 2022-11-22 | 重庆亿森动力环境科技有限公司 | Water quality monitoring system based on Internet of things |
| CN116902612B (en) * | 2023-09-12 | 2024-01-16 | 常州金源机械设备有限公司 | Intelligent material stepping system capable of uniformly distributing materials and control method thereof |
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