CN106679762B - Water level sensor for monitoring ocean water level - Google Patents
Water level sensor for monitoring ocean water level Download PDFInfo
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- CN106679762B CN106679762B CN201710029563.7A CN201710029563A CN106679762B CN 106679762 B CN106679762 B CN 106679762B CN 201710029563 A CN201710029563 A CN 201710029563A CN 106679762 B CN106679762 B CN 106679762B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/80—Arrangements for signal processing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Thermal Sciences (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
- Emergency Alarm Devices (AREA)
Abstract
The invention discloses a water level sensor for monitoring ocean water level, comprising: the device comprises a double-electrode probe, a first current amplifying unit and a second current amplifying unit which are connected to the double-electrode probe, a first signal isolating unit connected with the first current amplifying unit, a second signal isolating unit connected with the second current amplifying unit, an oscillator unit for generating a reference square wave signal and a power supply unit; the first current amplifying unit comprises a mos tube; the second current amplifying unit comprises a triode; the first signal isolation unit comprises a first photoelectric isolator, a second resistor and a third resistor; the second signal isolation unit comprises a second photoelectric isolator, a fourth resistor and a fifth resistor; the oscillator unit comprises a sliding resistor, a capacitor, a fourth NOT gate and a fifth NOT gate; the logic unit comprises a seventh NOT gate and an AND gate; the counting unit comprises a counter and a double-row socket. The invention solves the defects of delay alarm, false alarm and alarm signal disorder existing in the water level alarm.
Description
Technical Field
The invention relates to the technical field of ocean water level monitoring equipment, in particular to a water level sensor for ocean water level monitoring.
Background
The water level alarm sensor can monitor the water storage amount in the container and can be used as a water inlet alarm sensor of a closed space. In particular, sealed electronic cabins exist in instruments and equipment in the ocean, lakes and rivers for storing the electronic equipment. For the long-term stable operation of the equipment, a safety real-time monitoring system is arranged in the equipment, wherein a water inlet alarm sensor is an essential safety monitoring device.
The common water level alarm comprises a mechanical floating ball water level alarm, a magnetic induction water level alarm, an electronic water level alarm and the like. The mechanical floating ball water level alarm is to trigger a switch to alarm through the position of a water level change floating ball; the magnetic induction water level alarm triggers a magnetic reed switch to alarm through changing the position of the ring-shaped magnet floating ball by the water level; the electronic water level gauge monitors the water level through the electronic probe to change the high-low level state of the output signal and starts an alarm. Humidity sensors are also used in individual devices as water inlet alarm sensors, which trigger an alarm by a change in the relative humidity inside the device.
The mechanical floating ball water level alarm and the magnetic induction water level alarm can trigger the water level alarm only when the water level reaches a certain height, and can not meet the requirement of lower water level alarm. In particular, the real-time alarm requirements cannot be met when the sensor is used as a water inlet alarm sensor. In addition, when the equipment is in a motion state, the position of the floating ball or the mechanical arm is changed under the influence of inertia, so that a false alarm phenomenon exists.
The electronic water level alarm in the current market adopts the mode of sensing whether two electrodes are immersed in water or not, so that the high-low level of signal output is changed to trigger an alarm.
The double electrodes are connected directly to DC power source, and when immersed in water, the two electrodes are conducted to output high level via the amplifier, or else low level is output. When the instrument and the water surface have relative motion, the output signal is unstable, and the difficulty of later signal extraction is increased.
When the humidity sensor is used as a water inlet alarm sensor, the influence of the humidity in the instrument on the environment humidity is large when the instrument is installed, especially when the instrument is maintained in the field, and the effective extraction of alarm signals is inconvenient.
Disclosure of Invention
The invention aims to solve the technical problems that: providing a water level sensor for monitoring ocean water level; the water level sensor for ocean water level monitoring can adapt to the severe environment of ocean, and can solve the defects of delay alarm, false alarm and alarm signal disorder existing in the current water level alarm.
The invention adopts the technical proposal for solving the technical problems in the prior art that:
a water level sensor for marine water level monitoring, comprising at least:
a dual electrode probe;
the first current amplifying unit and the second current amplifying unit are connected to the double-electrode probe; wherein: the first current amplifying unit comprises a mos tube; the second current amplifying unit comprises a triode; the source electrode of the mos tube is electrically connected with one electrode of the double-electrode probe; the base electrode of the triode is electrically connected with the other electrode of the double-electrode probe;
the first signal isolation unit is electrically connected with the first current amplification unit; the first signal isolation unit comprises a first photoelectric isolator, a second resistor and a third resistor; the signal input terminal of the first photoelectric isolator is electrically connected with the drain electrode and the grid electrode of the mos tube respectively; the grid electrode of the mos tube is grounded through a third resistor; the signal output terminal of the first photoelectric isolator is grounded through a second resistor; the drain electrode of the mos tube is electrically connected with the power supply terminal;
the second signal isolation unit is electrically connected with the second current amplification unit; the second signal isolation unit comprises a second photoelectric isolator, a fourth resistor and a fifth resistor; the signal input terminal of the second photoelectric isolator is electrically connected with the collector electrode of the triode; the emitter of the triode is electrically connected with the output end of the second photoelectric isolator; the input terminal of the second photoelectric isolator is grounded through a fifth resistor; the emitter of the triode is grounded; the output end of the second photoelectric isolator is electrically connected with the power supply terminal through a fourth resistor;
an oscillator unit for generating a reference square wave signal; the oscillator unit comprises a sliding resistor, a capacitor, a fourth NOT gate and a fifth NOT gate; the output terminal of the fourth NOT gate is electrically connected with the input terminal of the fifth NOT gate; the output terminal of the fifth NOT gate is electrically connected with the output terminal of the first photoelectric isolator; the input terminal of the fourth NOT gate is electrically connected with the output terminal of the fifth NOT gate through a capacitor; the input terminal of the fourth NOT gate is electrically connected with the output terminal of the fourth NOT gate through a sliding resistor;
a logic unit; the logic unit comprises a seventh NOT gate and an AND gate; a first terminal of the seventh NOT gate is electrically connected with a first input terminal of the AND gate; a second input terminal of the AND gate is electrically connected with an output terminal of the second photoelectric isolator; the second input terminal of the AND gate is electrically connected with the power supply terminal through a fourth resistor;
a counting unit; the counting unit comprises a counter and a double-row socket; the output terminal of the AND gate is electrically connected with the clock terminal of the counter; the output terminal of the counter is electrically connected with the input terminal of the double-row socket; the output terminal of the double-row socket is electrically connected with the alarm signal terminal; the alarm signal terminal is electrically connected with the input terminal of the seventh NOT gate; the reset terminal of the counter is connected with a reset signal;
and a power supply unit for supplying power to each of the above units.
Further: the mos tube is a p-channel mos tube.
Further: the shell of the double-electrode probe is coated with a hydrophobic coating.
Further: the counting unit comprises a first counter, a second counter and a third counter which are sequentially connected in series.
The invention has the advantages and positive effects that:
by adopting the technical scheme, the invention adopts the double electrodes as the water level monitoring probe, has compact structure, realizes accurate installation at different heights, and avoids delay alarm;
the invention adopts the double electrodes as the water level monitoring probe, thereby avoiding the false alarm phenomenon caused by inertia;
the invention adopts the frequency signal as the input signals of the double-electrode power supply, the second current amplifying unit, the second signal isolating unit and the logic unit, and generates the alarm signal through the accumulation and the counting of the counting unit, thereby avoiding the alarm signal disorder phenomenon when the water level sensor and the water surface relatively run;
the alarm signal forms feedback to the counter unit through the logic unit to form a stable alarm signal;
the invention can receive the reset signal of the upper computer to realize the reset of the system;
the frequency of the oscillator unit is adjustable, and the counting number of the counter unit is adjustable;
the surface of the double-electrode probe is coated with the hydrophobic coating, so that false alarm and rapid reset of alarm signals generated by condensation of water vapor and water drops at the probe are realized.
Drawings
FIG. 1 is a circuit block diagram of a preferred embodiment of the present invention;
FIG. 2 is a circuit diagram of a preferred embodiment of the present invention;
FIG. 3 is a graph of frequency signals in a preferred embodiment of the present invention;
Detailed Description
For a further understanding of the invention, its features and advantages, reference is now made to the following examples, which are illustrated in the accompanying drawings in which:
referring to fig. 1 to 3, a water level sensor for monitoring ocean water level includes:
a double electrode probe P1;
the first current amplifying unit and the second current amplifying unit are connected to the double-electrode probe; wherein: the first current amplifying unit comprises a mos tube Q1; the second current amplifying unit comprises a triode Q2; the source electrode of the mos tube Q1 is electrically connected with the electrode A of the double-electrode probe; the base electrode of the triode Q2 is electrically connected with the electrode B of the double-electrode probe; the mos tube in the preferred embodiment is a p-channel mos tube
The first signal isolation unit is electrically connected with the first current amplification unit; the first signal isolation unit comprises a first photoelectric isolator U8, a second resistor R2 and a third resistor R3; the signal input terminal of the first photoelectric isolator U8 is electrically connected with the drain electrode and the grid electrode of the mos tube Q1 respectively; the grid electrode of the mos tube Q1 is grounded through a third resistor R3; the signal output terminal of the first photoelectric isolator U8 is grounded to GND through a second resistor R2; the drain electrode of the mos tube Q1 is electrically connected with a power supply terminal VCC;
the second signal isolation unit is electrically connected with the second current amplification unit; the second signal isolation unit comprises a second photoelectric isolator U9, a fourth resistor R4 and a fifth resistor R5; the signal input terminal of the second photoelectric isolator U9 is electrically connected with the collector electrode of the triode Q2; the emitter of the triode Q2 is electrically connected with the output end of the second photoelectric isolator U9; the input terminal of the second photoelectric isolator U9 is grounded through a fifth resistor R5; the emitter of the triode Q2 is grounded GND; the output end of the second photoelectric isolator U9 is electrically connected with a power supply terminal VCC through a fourth resistor R4;
an oscillator unit for generating a reference square wave signal; the oscillator unit comprises a sliding resistor R1, a capacitor C1, a fourth NOT gate U4 and a fifth NOT gate U5; the output terminal of the fourth NOT gate U4 is electrically connected with the input terminal of the fifth NOT gate U5; the output terminal of the fifth NOT gate U5 is electrically connected with the output terminal of the first photoelectric isolator U8; the input terminal of the fourth NOT gate U4 is electrically connected with the output terminal of the fifth NOT gate U5 through a capacitor C1; the input terminal of the fourth NOT gate U4 is electrically connected with the output terminal of the fourth NOT gate U4 through a sliding resistor R1;
a logic unit; the logic unit comprises a seventh NOT gate U7 and an AND gate U6; a first terminal of the seventh NOT gate U7 is electrically connected with a first input terminal of the AND gate U6; a second input terminal of the AND gate U6 is electrically connected with an output terminal of a second photoelectric isolator U9; the second input terminal of the AND gate U6 is electrically connected with a power supply terminal VCC through a fourth resistor R4;
a counting unit; the counting unit comprises a counter and a double-row socket J1; the output terminal of the AND gate U6 is electrically connected with the clock terminal of the counter; the output terminal of the counter is electrically connected with the input terminal of the double-row socket J1; the output terminal of the double-row socket J1 is electrically connected with the alarm signal terminal; the alarm signal terminal is electrically connected with the input terminal of the seventh NOT gate U7; the reset terminal of the counter is connected with a reset signal;
and a power supply unit for supplying power to each of the above units.
The shell of the double-electrode probe is coated with a hydrophobic coating.
The counting unit comprises a first counter U1, a second counter U2 and a third counter U3 which are sequentially connected in series.
The above preferred embodiments mainly include: the device comprises a power supply unit, an oscillator unit, a first signal isolation unit, a first current amplification unit, a second signal isolation unit, a logic unit and a counter unit.
The power supply unit supplies power for the oscillator unit, the first signal isolation unit, the first current amplification unit, the second signal isolation unit, the logic unit and the counter unit.
The oscillator unit provides a reference square wave signal to the system, preferably: the oscillator unit comprises a sliding resistor R1, a capacitor C1, a fourth NOT gate U4 and a fifth NOT gate U5; the RC oscillator is composed of the sliding resistor, the capacitor and the two NOT gates.
The signal isolation unit is used for isolating signals between the oscillator unit and the first current amplification unit, so that the stability of the system is improved.
The second signal isolation unit is used for performing signal isolation on the second current amplification unit and the logic unit, so that the stability of the system is improved, and a photoelectric isolation chip and an electromagnetic isolation chip are preferred.
The first current amplifying unit is used for amplifying the current of the periodic signal generated by the oscillator unit, and improving the driving capability of the periodic signal, and is preferably a grid tube.
The second current amplifying unit is used for amplifying the current of the signal generated by the electrode B, so that the driving capability of the signal is improved, and a grid tube is preferred.
The logic unit is used for providing a signal source for the counter unit and consists of an AND gate and an NOT gate. The second signal isolation unit is electrically connected with one input end of the AND gate, and the output signal is electrically connected with the other input end of the AND gate through the NOT gate.
The counter unit is used for counting the alarm signals, and can output the alarm signals only after receiving a certain number of periodic signals, so that signal disorder is avoided when the sensor and the water level move relatively.
Referring to fig. 3, P0 is a reference square wave signal generated by an oscillator, L1 and L2 are two water level signals, S1 and S2 are primary water level signals generated by current amplification and signal isolation of electrodes B corresponding to L1 and L2, and A1 and A2 are alarm signals output corresponding to L1 and L2. The examples presented herein do not contain a reset signal.
In fig. 3, for the water level signals L1, S1, after the water level changes, square wave signals with the same frequency as P0 are generated, and when the number of signals is accumulated to a certain amount by the counter unit, an alarm signal is generated, that is, A1 changes. In addition, when A1 is high level, the signal output by the logic unit is low level, the counter numbers are not accumulated any more, and the inversion of the output signal is avoided.
In fig. 3, for the water level signal L2, there is relative motion between the water level and the sensor, the square wave signal corresponding to S2 is intermittent, and after a certain number of square wave signals are accumulated by the counter, an alarm signal is generated, so that the occurrence of the intermittent situation of the alarm signal is avoided. Similarly, after the alarm signal occurs, the alarm signal is fed back to the counter unit through the logic unit, so that the alarm signal is prevented from disappearing.
Referring to fig. 2, fig. 2 is a preferred circuit of the above embodiment. Wherein the sliding resistor R1, the capacitance C1, the inverters U4, U5 constitute a preferred circuit of the oscillator. The photo-isolator U8, the resistors R2, R3 constitute a preferred circuit of the isolation unit. Mos tube Q1 is a preferred circuit for current amplifying unit 1. One preferred circuit for the second current amplifying unit employs a transistor Q2. The photo-isolator U9, the fourth resistor R4, and the fifth resistor R5 constitute a preferred circuit. The seventh NOT gate U7 and the AND gate U6 form a preferred circuit of the logic unit. The counters U1, U2, U3 and the double row socket J1 constitute a preferred circuit of the counting unit.
The foregoing describes the embodiments of the present invention in detail, but the description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. All equivalent changes and modifications within the scope of the present invention are intended to be covered by the present invention.
Claims (2)
1. The utility model provides a water level sensor for ocean water level monitoring which characterized in that: comprising the following steps:
a dual electrode probe; the shell of the double-electrode probe is coated with a hydrophobic coating;
the first current amplifying unit and the second current amplifying unit are connected to the double-electrode probe; wherein: the first current amplifying unit comprises a mos tube; the second current amplifying unit comprises a triode; the source electrode of the mos tube is electrically connected with one electrode of the double-electrode probe; the base electrode of the triode is electrically connected with the other electrode of the double-electrode probe;
the first signal isolation unit is electrically connected with the first current amplification unit; the first signal isolation unit comprises a first photoelectric isolator, a second resistor and a third resistor; the signal input terminal of the first photoelectric isolator is electrically connected with the drain electrode and the grid electrode of the mos tube respectively; the grid electrode of the mos tube is grounded through a third resistor; the signal output terminal of the first photoelectric isolator is grounded through a second resistor; the drain electrode of the mos tube is electrically connected with the power supply terminal;
the second signal isolation unit is electrically connected with the second current amplification unit; the second signal isolation unit comprises a second photoelectric isolator, a fourth resistor and a fifth resistor; the signal input terminal of the second photoelectric isolator is electrically connected with the collector electrode of the triode; the emitter of the triode is electrically connected with the output end of the second photoelectric isolator; the input terminal of the second photoelectric isolator is grounded through a fifth resistor; the emitter of the triode is grounded; the output end of the second photoelectric isolator is electrically connected with the power supply terminal through a fourth resistor;
an oscillator unit for generating a reference square wave signal; the oscillator unit comprises a sliding resistor, a capacitor, a fourth NOT gate and a fifth NOT gate; the output terminal of the fourth NOT gate is electrically connected with the input terminal of the fifth NOT gate; the output terminal of the fifth NOT gate is electrically connected with the output terminal of the first photoelectric isolator; the input terminal of the fourth NOT gate is electrically connected with the output terminal of the fifth NOT gate through a capacitor; the input terminal of the fourth NOT gate is electrically connected with the output terminal of the fourth NOT gate through a sliding resistor;
a logic unit; the logic unit comprises a seventh NOT gate and an AND gate; a first terminal of the seventh NOT gate is electrically connected with a first input terminal of the AND gate; a second input terminal of the AND gate is electrically connected with an output terminal of the second photoelectric isolator; the second input terminal of the AND gate is electrically connected with the power supply terminal through a fourth resistor;
a counting unit; the counting unit comprises a double-row socket, a first counter, a second counter and a third counter which are sequentially connected in series; the output terminal of the AND gate is electrically connected with the clock terminal of the counter; the output terminal of the counter is electrically connected with the input terminal of the double-row socket; the output terminal of the double-row socket is electrically connected with the alarm signal terminal; the alarm signal terminal is electrically connected with the input terminal of the seventh NOT gate; the reset terminal of the counter is connected with a reset signal;
and a power supply unit for supplying power to each of the above units.
2. The water level sensor for ocean water level monitoring according to claim 1, wherein: the mos tube is a p-channel mos tube.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710029563.7A CN106679762B (en) | 2017-01-16 | 2017-01-16 | Water level sensor for monitoring ocean water level |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710029563.7A CN106679762B (en) | 2017-01-16 | 2017-01-16 | Water level sensor for monitoring ocean water level |
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| CN106679762A CN106679762A (en) | 2017-05-17 |
| CN106679762B true CN106679762B (en) | 2023-05-23 |
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2017
- 2017-01-16 CN CN201710029563.7A patent/CN106679762B/en active Active
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| DE10156580A1 (en) * | 2001-11-20 | 2003-05-28 | Sie Sensorik Ind Elektronik Gm | Oscillator circuit for a capacitive sensor for detecting the presence of an object between an active electrode and earth has a circuit with small signal NPN and PNP transducers that provide improved operating characteristics |
| CN2602408Y (en) * | 2003-01-14 | 2004-02-04 | 耿利平 | Liquid-level automatic controller |
| CN1595075A (en) * | 2004-06-18 | 2005-03-16 | 李虬 | Water level measuring apparatus |
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