CN112098619A - Groundwater pollution detection device - Google Patents
Groundwater pollution detection device Download PDFInfo
- Publication number
- CN112098619A CN112098619A CN202010987218.6A CN202010987218A CN112098619A CN 112098619 A CN112098619 A CN 112098619A CN 202010987218 A CN202010987218 A CN 202010987218A CN 112098619 A CN112098619 A CN 112098619A
- Authority
- CN
- China
- Prior art keywords
- resistor
- operational amplifier
- circuit
- inverting input
- triode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 38
- 238000003895 groundwater pollution Methods 0.000 title claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 238000006243 chemical reaction Methods 0.000 claims abstract description 16
- 230000003321 amplification Effects 0.000 claims abstract description 9
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 9
- 239000003990 capacitor Substances 0.000 claims description 16
- 238000003911 water pollution Methods 0.000 claims description 7
- 238000011109 contamination Methods 0.000 claims 2
- 239000003673 groundwater Substances 0.000 claims 2
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 230000000087 stabilizing effect Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/18—Water
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Amplifiers (AREA)
Abstract
The invention relates to the technical field of environmental protection, and provides a groundwater pollution detection device which comprises a sensor interface circuit connected with a main control circuit, wherein the sensor interface circuit comprises a signal conversion circuit and an amplification circuit which are sequentially connected, the input end of the signal conversion circuit is used for being connected with a water quality detection sensor, the output end of the amplification circuit is connected with the main control circuit, the signal conversion circuit comprises a resistor R41, an operational amplifier U5A, an operational amplifier U5B and an operational amplifier U4A, one end of the resistor R41 is connected with the current output end I _ IN1 of the water quality detection sensor, the other end of the resistor R41 is connected with the current output end I _ IN2 of the water quality detection sensor, one end of the resistor R41 is also connected with the inverting input end of the operational amplifier U5A, and the other end of the resistor R41 is connected with the inverting input end of. Through above-mentioned technical scheme, the problem that groundwater pollution detection device detects the precision poor among the prior art has been solved.
Description
Technical Field
The invention relates to the technical field of environmental protection, in particular to a groundwater pollution detection device.
Background
With the rapid development of economy in China and the acceleration of industrialization and urbanization processes, the problem of groundwater pollution becomes increasingly serious, and the problem becomes the bottleneck of the harmonious development of economic development and ecological environment in China. For the treatment and control of water environment, not only needs to perfect relevant laws and regulations and effective supervision and control system, but also needs to develop water quality detection equipment as an important means for protecting water environment and controlling water pollution. The water quality detection can accurately reflect the condition of water quality and predict the development trend of the water quality, can also provide scientific basis for the protection, development and utilization of water resources and the prevention and treatment of water pollution, and has practical guiding significance for the treatment of the water pollution problem in China. At present, the detection precision of underground water quality detection equipment is still to be improved.
Disclosure of Invention
The invention provides a groundwater pollution detection device, which solves the problem that a groundwater pollution detection device in the prior art is poor in detection precision.
The technical scheme of the invention is as follows: comprises a sensor interface circuit connected with a main control circuit, the sensor interface circuit comprises a signal conversion circuit and an amplifying circuit which are connected in sequence,
the input end of the signal conversion circuit is used for being connected with the water quality detection sensor, the output end of the amplifying circuit is connected with the main control circuit,
the signal conversion circuit comprises a resistor R41, an operational amplifier U5A, an operational amplifier U5B and an operational amplifier U4A, one end of the resistor R41 is connected with a current output end I _ IN1 of the water quality detection sensor, the other end of the resistor R41 is connected with a current output end I _ IN2 of the water quality detection sensor,
one end of the resistor R41 is also connected with the inverting input end of the operational amplifier U5A, the other end of the resistor R41 is connected with the inverting input end of the operational amplifier U5B,
a resistor R42 is connected between the output end and the non-inverting input end of the operational amplifier U5A, a resistor R44 is connected between the output end and the non-inverting input end of the operational amplifier U5B, the resistance values of the resistor R42 and the resistor R44 are the same, a resistor R43 is connected between the resistor R42 and the resistor R44,
a resistor R45 is connected between the output end of the operational amplifier U5A and the inverting input end of the operational amplifier U4A, a resistor R47 is connected between the output end of the operational amplifier U5B and the non-inverting input end of the operational amplifier U4A, the resistances of the resistor R45 and the resistor R47 are the same,
a resistor R46 is connected between the output end and the inverting input end of the operational amplifier U4A, the non-inverting input end of the operational amplifier U4A is grounded through a resistor R48, and the resistance values of the resistor R46 and the resistor R48 are the same.
Further, the amplifying circuit comprises an operational amplifier U6, a non-inverting input terminal of the operational amplifier U6 is connected with an output terminal of the operational amplifier U4A through a resistor R17, an inverting input terminal of the operational amplifier U6 is connected with a bias circuit through a resistor R14, a resistor R15 is connected between an output terminal and an inverting input terminal of the operational amplifier U6,
the output end of the operational amplifier U6 is also connected with the main control circuit.
Further, the bias circuit comprises a potentiometer WR1, a resistor R12 and a resistor R13 which are connected in sequence,
one fixed end of the potentiometer WR1 is connected with a first direct current power supply, the other fixed end of the potentiometer WR1 is connected with a second direct current power supply, the sliding end of the potentiometer WR1 is connected with one end of the resistor R12, the other end of the resistor R12 is connected with the resistor R14, and one end of the resistor R13 is grounded.
Further, the output filter circuit comprises a resistor R19 and a capacitor C19 which are connected in sequence, one end of the resistor R19 is connected with the output end of the operational amplifier U6, and one end of the capacitor C19 is grounded.
Furthermore, a capacitor C15 is connected in parallel to two ends of the resistor R15.
Furthermore, the inverting input end of the operational amplifier U6 is grounded through a capacitor C16 and a resistor R16 in sequence.
Further, the overvoltage protection circuit comprises a resistor R3, a voltage regulator tube VD3, a triode Q2 and a MOS tube M1,
the cathode of the voltage-stabilizing tube VD3 is connected with an external direct-current power supply through a resistor R3, the anode of the voltage-stabilizing tube VD3 is grounded,
the base electrode of the triode Q2 is connected with the cathode of the voltage regulator VD3 through a resistor R4, the emitter electrode of the triode Q2 is connected with an external direct current power supply, the collector electrode of the triode Q2 is grounded through a resistor R6,
a resistor R5 is connected in parallel between the collector and the emitter of the triode Q2, one end of the resistor R5 is connected with the S pole of the MOS tube M1, one end of the resistor R5 is connected with the G pole of the MOS tube M1, and the D pole of the MOS tube M1 outputs the first direct current power supply.
Further, the triode voltage stabilizer further comprises a voltage stabilizing tube VD4, the cathode of the voltage stabilizing tube VD4 is connected with the emitter of the triode Q2, and the anode of the voltage stabilizing tube VD4 is connected with the base of the triode Q2.
The working principle and the beneficial effects of the invention are as follows:
the output signal of the water quality detection sensor is an alternating current signal of 4-20 mA, and the sensor interface circuit in the embodiment is used for converting the current signal of 4-20 mA into a voltage signal which can be identified by the main control circuit, so that the reading of the output data of the water quality detection sensor by the main control circuit is realized. The signal conversion circuit is used for converting a 4-20 mA current signal into a voltage signal, and the working process is as follows:
4-20 mA current signals are added to two ends of a resistor R41, voltages at two ends of the resistor R41 are respectively connected to inverting input ends of an operational amplifier U5A and an operational amplifier U5B, circuit structures of the operational amplifier U5A and the operational amplifier U5B adopt a symmetrical form, peripheral resistors R42, R43, R44, R45, R46, R47 and R48 all adopt precise resistors, output ends of the operational amplifier U5A and the operational amplifier U5B are respectively connected to an inverting input end and a non-inverting input end of the operational amplifier U4A for differential amplification, and the two ends are beneficial to mutual cancellation of drift, noise, offset voltage, offset current and the like, so that the measurement precision of the circuit is improved.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic block diagram of the circuit of the present invention;
FIG. 2 is a schematic diagram of a signal conversion circuit according to the present invention;
FIG. 3 is a schematic diagram of an amplifying circuit according to the present invention;
FIG. 4 is a schematic diagram of an overvoltage protection circuit of the present invention;
in the figure: the device comprises a main control circuit 1, a sensor interface unit 2, a signal conversion circuit 21, an amplification circuit 22, a bias circuit 221 and an overvoltage protection circuit 6.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any inventive step, are intended to be within the scope of the present invention.
As shown in fig. 1, the schematic block diagram of the circuit of the groundwater pollution detection device in this embodiment includes a sensor interface circuit connected to the main control circuit 1, the sensor interface circuit includes a signal conversion circuit 21 and an amplification circuit 22 connected in sequence,
the input end of the signal conversion circuit 21 is used for being connected with the water quality detection sensor, the output end of the amplifying circuit 22 is connected with the main control circuit 1,
the signal conversion circuit 21 comprises a resistor R41, an operational amplifier U5A, an operational amplifier U5B and an operational amplifier U4A, one end of the resistor R41 is connected with a current output end I _ IN1 of the water quality detection sensor, the other end of the resistor R41 is connected with a current output end I _ IN2 of the water quality detection sensor,
one end of the resistor R41 is also connected with the inverting input end of the operational amplifier U5A, the other end of the resistor R41 is connected with the inverting input end of the operational amplifier U5B,
a resistor R42 is connected between the output end and the non-inverting input end of the operational amplifier U5A, a resistor R44 is connected between the output end and the non-inverting input end of the operational amplifier U5B, the resistance values of the resistor R42 and the resistor R44 are the same, a resistor R43 is connected between the resistor R42 and the resistor R44,
a resistor R45 is connected between the output end of the operational amplifier U5A and the inverting input end of the operational amplifier U4A, a resistor R47 is connected between the output end of the operational amplifier U5B and the non-inverting input end of the operational amplifier U4A, the resistance values of the resistor R45 and the resistor R47 are the same,
a resistor R46 is connected between the output end and the inverting input end of the operational amplifier U4A, the non-inverting input end of the operational amplifier U4A is grounded through a resistor R48, and the resistance values of the resistor R46 and the resistor R48 are the same.
The water quality detection sensor comprises a common pH sensor, an ORP sensor, a conductivity sensor, a dissolved oxygen sensor, a turbidity sensor, a residual chlorine sensor, an ammonia nitrogen sensor or a COD content sensor and the like, an output signal of the water quality detection sensor is an alternating current signal of 4-20 mA, a sensor interface circuit in the embodiment is used for converting the current signal of 4-20 mA into a voltage signal which can be identified by the main control circuit 1, and the reading of the output data of the water quality detection sensor by the main control circuit 1 is realized. The signal conversion circuit 21 is used for converting a 4-20 mA current signal into a voltage signal, and the working process is as follows:
as shown in fig. 2, 4-20 mA current signals are applied to two ends of a resistor R41, voltages at two ends of the resistor R41 are respectively connected to inverting input terminals of an operational amplifier U5A and an operational amplifier U5B, circuit structures of the operational amplifier U5A and the operational amplifier U5B adopt a symmetrical form, peripheral resistors R42, R43, R44, R45, R46, R47 and R48 all adopt precise resistors, output terminals of the operational amplifier U5A and the operational amplifier U5B are respectively connected to an inverting input terminal and a non-inverting input terminal of the operational amplifier U4A for differential amplification, and the output terminals are beneficial to mutual cancellation of drift, noise, offset voltage, offset current and the like, so that the measurement accuracy of the circuit is improved.
Further, the amplifying circuit 22 comprises an operational amplifier U6, a non-inverting input terminal of the operational amplifier U6 is connected with an output terminal of the operational amplifier U4A through a resistor R17, an inverting input terminal of the operational amplifier U6 is connected with the bias circuit 221 through a resistor R14, a resistor R15 is connected between an output terminal and an inverting input terminal of the operational amplifier U6,
the output end of the operational amplifier U6 is also connected with the main control circuit 1.
As shown IN fig. 3, the voltage signal output by the operational amplifier U4A is an ac voltage signal, the ac voltage signal is connected to the non-inverting input terminal of the operational amplifier U6, the dc voltage signal output by the bias circuit 221 is connected to the inverting input terminal of the operational amplifier U6, so as to form a subtraction circuit, and a dc bias is added to the ac voltage signal output by the operational amplifier U4A, so as to boost the ac voltage signal, and the ac voltage signal is input to the AD sampling pin ADC _ IN0 of the main control circuit 1.
Further, the bias circuit 221 includes a potentiometer WR1, a resistor R12, and a resistor R13 connected in sequence,
one fixed end of the potentiometer WR1 is connected with a first direct current power supply, the other fixed end of the potentiometer WR1 is connected with a second direct current power supply, the sliding end of the potentiometer WR1 is connected with one end of a resistor R12, the other end of the resistor R12 is connected with a resistor R14, and one end of a resistor R13 is grounded.
As shown in fig. 3, the dc power source i is +15V, the dc power source ii is-15V, one fixed end of the potentiometer WR1 is connected to the dc power source i, the other fixed end is connected to the dc power source ii, the voltage at the sliding end of the potentiometer WR1 can be adjusted by adjusting the position of the sliding end of the potentiometer WR1, the resistor R12 and the resistor R12 form a serial voltage dividing circuit, which is connected between the sliding end of the potentiometer WR1 and the ground, and the voltage division of the resistor R13 can be adjusted by adjusting the position of the sliding end of the potentiometer WR1, so as to adjust the output voltage of the bias circuit 221, and ensure that the voltage polarity at the output end of the operational amplifier U6 meets the requirement of the main control circuit 1.
Further, the output filter circuit is further included, the output filter circuit comprises a resistor R19 and a capacitor C19 which are sequentially connected, one end of the resistor R19 is connected with the output end of the operational amplifier U6, and one end of the capacitor C19 is grounded.
The resistor R19 and the capacitor C19 form an RC filter circuit which is connected to the output end of the operational amplifier U6 and used for filtering the output signal of the operational amplifier U6, so that a high-frequency interference signal is prevented from entering the main control circuit 1, and the reliable work of the main control circuit 1 is ensured.
Further, a capacitor C15 is connected in parallel to both ends of the resistor R15.
The capacitors C15 and C15 are connected in parallel at two ends of the resistor R15 to form a feedback channel of the high-frequency signal, which is beneficial to reducing the amplification factor of the high-frequency signal and avoiding the excessive high-frequency signal from entering the main control circuit 1.
Further, the inverting input terminal of the operational amplifier U6 is grounded through a capacitor C16 and a resistor R16 in sequence.
The inverting input end of the operational amplifier U6 is grounded through the capacitor C16 and the resistor R16 in sequence, the capacitor C16 is used for filtering high-frequency signals, the high-frequency signals are prevented from entering the operational amplifier U6, and the resistor R16 plays a role in impedance matching.
Further, the overvoltage protection circuit 6 is also included, the overvoltage protection circuit 6 includes a resistor R3, a voltage regulator tube VD3, a triode Q2 and a MOS tube M1,
the cathode of the voltage-stabilizing tube VD3 is connected with an external direct-current power supply through a resistor R3, the anode of the voltage-stabilizing tube VD3 is grounded,
the base electrode of the triode Q2 is connected with the cathode of the voltage regulator VD3 through a resistor R4, the emitter electrode of the triode Q2 is connected with an external direct current power supply, the collector electrode of the triode Q2 is grounded through a resistor R6,
a resistor R5 is connected in parallel between the collector and the emitter of the triode Q2, one end of the resistor R5 is connected with the S pole of the MOS tube M1, one end of the resistor R5 is connected with the G pole of the MOS tube M1, and the D pole of the MOS tube M1 outputs a first direct current power supply.
As shown in fig. 4, the overvoltage protection circuit 6 in this embodiment is configured to prevent an external power supply with an excessive voltage from being connected to the circuit in this embodiment, and the specific working process is as follows:
the voltage stabilizing value of the voltage stabilizing tube is 20V, when the +15V _ IN of an external power supply is within 20V, the voltage stabilizing tube VD3 is not conducted, which is equivalent to an open circuit, the base electrode of the triode Q1 is pulled up to +15V _ IN through the resistor R3 and the resistor R4, and the triode Q1 is cut off; meanwhile, a resistor R5 and a resistor R6 form a resistor voltage dividing circuit and are connected between +15V _ IN and the ground, voltage at two ends of the resistor R5 provides conducting voltage for the MOS tube M1, the S pole and the D pole of the MOS tube M1 are conducted, and +15V _ IN is connected into the circuit to output a first direct current power supply.
When the +15V _ IN of the external power supply is larger than 20V, the voltage of the cathode of the voltage-stabilizing tube VD3 is maintained at 20V, the voltage between the emitter and the base of the triode Q1 is larger than zero, the emitter and the collector of the triode are conducted, the resistor R5 is IN short circuit, the G-pole voltage of the MOS tube M1 is equal to the S-pole voltage, the MOS tube M1 is switched off, and the +15V _ IN is switched off for power supply.
Further, the voltage regulator tube VD4 is further included, the cathode of the voltage regulator tube VD4 is connected with the emitter of the triode Q2, and the anode of the voltage regulator tube VD4 is connected with the base of the triode Q2.
IN this embodiment, the voltage stabilizing value of the voltage regulator VD4 is 4V, and the voltage between the emitter and the base of the transistor Q1 is limited within 4V, so as to prevent the transistor Q1 from being broken down due to the excessive voltage between the emitter and the base of the transistor Q1 when the external power supply +15V _ IN is too high.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The underground water pollution detection device comprises a sensor interface circuit connected with a main control circuit (1), and is characterized in that the sensor interface circuit comprises a signal conversion circuit (21) and an amplification circuit (22) which are sequentially connected,
the input end of the signal conversion circuit (21) is used for being connected with a water quality detection sensor, the output end of the amplifying circuit (22) is connected with the main control circuit (1),
the signal conversion circuit (21) comprises a resistor R41, an operational amplifier U5A, an operational amplifier U5B and an operational amplifier U4A, one end of the resistor R41 is connected with a current output end I _ IN1 of the water quality detection sensor, the other end of the resistor R41 is connected with a current output end I _ IN2 of the water quality detection sensor,
one end of the resistor R41 is also connected with the inverting input end of the operational amplifier U5A, the other end of the resistor R41 is connected with the inverting input end of the operational amplifier U5B,
a resistor R42 is connected between the output end and the non-inverting input end of the operational amplifier U5A, a resistor R44 is connected between the output end and the non-inverting input end of the operational amplifier U5B, the resistance values of the resistor R42 and the resistor R44 are the same, a resistor R43 is connected between the resistor R42 and the resistor R44,
a resistor R45 is connected between the output end of the operational amplifier U5A and the inverting input end of the operational amplifier U4A, a resistor R47 is connected between the output end of the operational amplifier U5B and the non-inverting input end of the operational amplifier U4A, the resistances of the resistor R45 and the resistor R47 are the same,
a resistor R46 is connected between the output end and the inverting input end of the operational amplifier U4A, the non-inverting input end of the operational amplifier U4A is grounded through a resistor R48, and the resistance values of the resistor R46 and the resistor R48 are the same.
2. An underground water pollution detection device according to claim 1, wherein said amplification circuit (22) comprises an operational amplifier U6, the non-inverting input terminal of said operational amplifier U6 is connected to the output terminal of said operational amplifier U4A through a resistor R17, the inverting input terminal of said operational amplifier U6 is connected to a bias circuit (221) through a resistor R14, a resistor R15 is connected between the output terminal and the inverting input terminal of said operational amplifier U6,
the output end of the operational amplifier U6 is also connected with the main control circuit (1).
3. A groundwater contamination detection apparatus as claimed in claim 2, wherein the bias circuit (221) includes a potentiometer WR1, a resistor R12 and a resistor R13 connected in this order,
one fixed end of the potentiometer WR1 is connected with a first direct current power supply, the other fixed end of the potentiometer WR1 is connected with a second direct current power supply, the sliding end of the potentiometer WR1 is connected with one end of the resistor R12, the other end of the resistor R12 is connected with the resistor R14, and one end of the resistor R13 is grounded.
4. A groundwater pollution detection device as claimed in claim 2, further comprising an output filter circuit, wherein the output filter circuit comprises a resistor R19 and a capacitor C19 connected in sequence, one end of the resistor R19 is connected to the output end of the operational amplifier U6, and one end of the capacitor C19 is grounded.
5. A groundwater contamination detection apparatus as claimed in claim 2, wherein a capacitor C15 is connected in parallel to both ends of the resistor R15.
6. The underground water pollution detection device according to claim 2, wherein the inverting input terminal of the operational amplifier U6 is grounded through a capacitor C16 and a resistor R16 in sequence.
7. A groundwater pollution detection device as claimed in claim 1, further comprising an overvoltage protection circuit (6), wherein the overvoltage protection circuit (6) comprises a resistor R3, a voltage regulator VD3, a triode Q2 and a MOS transistor M1,
the cathode of the voltage-stabilizing tube VD3 is connected with an external direct-current power supply through a resistor R3, the anode of the voltage-stabilizing tube VD3 is grounded,
the base electrode of the triode Q2 is connected with the cathode of the voltage regulator VD3 through a resistor R4, the emitter electrode of the triode Q2 is connected with an external direct current power supply, the collector electrode of the triode Q2 is grounded through a resistor R6,
a resistor R5 is connected in parallel between the collector and the emitter of the triode Q2, one end of the resistor R5 is connected with the S pole of the MOS tube M1, one end of the resistor R5 is connected with the G pole of the MOS tube M1, and the D pole of the MOS tube M1 outputs the first direct current power supply.
8. The underground water pollution detection device according to claim 7, further comprising a voltage regulator VD4, wherein the cathode of the voltage regulator VD4 is connected with the emitter of the triode Q2, and the anode of the voltage regulator VD4 is connected with the base of the triode Q2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010987218.6A CN112098619A (en) | 2020-09-18 | 2020-09-18 | Groundwater pollution detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010987218.6A CN112098619A (en) | 2020-09-18 | 2020-09-18 | Groundwater pollution detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112098619A true CN112098619A (en) | 2020-12-18 |
Family
ID=73759467
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010987218.6A Pending CN112098619A (en) | 2020-09-18 | 2020-09-18 | Groundwater pollution detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112098619A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104076859A (en) * | 2014-06-30 | 2014-10-01 | 成都赛英科技有限公司 | Microwave temperature compensation detector |
| CN206697912U (en) * | 2017-04-28 | 2017-12-01 | 深圳市源尤电源科技有限公司 | A kind of overvoltage crowbar of Switching Power Supply |
| CN108107170A (en) * | 2017-11-30 | 2018-06-01 | 湖州欣格膜科技有限公司 | A kind of open air sewage dynamic monitoring early warning system |
| CN110132118A (en) * | 2019-06-13 | 2019-08-16 | 重庆红江机械有限责任公司 | A kind of displacement detection system based on LVDT sensor |
| CN209343148U (en) * | 2018-09-18 | 2019-09-03 | 郑州瑞祥晟电子科技有限公司 | Intelligent water communication transmission control unit (TCU) |
-
2020
- 2020-09-18 CN CN202010987218.6A patent/CN112098619A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104076859A (en) * | 2014-06-30 | 2014-10-01 | 成都赛英科技有限公司 | Microwave temperature compensation detector |
| CN206697912U (en) * | 2017-04-28 | 2017-12-01 | 深圳市源尤电源科技有限公司 | A kind of overvoltage crowbar of Switching Power Supply |
| CN108107170A (en) * | 2017-11-30 | 2018-06-01 | 湖州欣格膜科技有限公司 | A kind of open air sewage dynamic monitoring early warning system |
| CN209343148U (en) * | 2018-09-18 | 2019-09-03 | 郑州瑞祥晟电子科技有限公司 | Intelligent water communication transmission control unit (TCU) |
| CN110132118A (en) * | 2019-06-13 | 2019-08-16 | 重庆红江机械有限责任公司 | A kind of displacement detection system based on LVDT sensor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103208956B (en) | Hall position sensor of motor alignment error detects and compensation arrangement and method automatically | |
| CN101191825B (en) | Direct-current power supply detection device | |
| CN206135879U (en) | A signal conditioning device for sensor | |
| CN112098619A (en) | Groundwater pollution detection device | |
| CN113679391B (en) | Electrocardiogram baseline drift filter device, electrocardiosignal sampling system and sampling method | |
| CN203376076U (en) | A temperature detection circuit for a permanent magnet synchronous motor for an electric car and a controller of the motor | |
| CN111551864B (en) | High-precision bidirectional current detection circuit applied to battery charging and discharging and method thereof | |
| CN205484401U (en) | Low -cost speed measurement circuit of high accuracy for brush DC motor | |
| CN217443440U (en) | Current acquisition circuit and device | |
| CN202614719U (en) | Amplifying circuit for carbon monoxide sensor | |
| CN114094946A (en) | Ultra-low noise signal amplification circuit for capacitive marine inert material electrode | |
| CN209803233U (en) | Signal acquisition circuit compatible with current and voltage input | |
| CN209446661U (en) | Electrochemical sensor signal acquisition circuit and electronic equipment | |
| CN113852274A (en) | Switching power supply far-end compensation circuit and switching power supply | |
| CN218445113U (en) | Photoelectric detection device for monitoring ambient air quality | |
| CN112157118A (en) | Soil detection and restoration device | |
| CN216670200U (en) | Handheld electromagnetic relay testing device | |
| CN118393580A (en) | Magnetic field front end detection device and mineral resource receiving system | |
| CN104991111A (en) | Wide-range alternating current signal zero-cross detection method and device | |
| CN206002585U (en) | Perception for electric fire disaster monitoring and resistive load share signal processor | |
| CN109066642B (en) | High-precision bidirectional overvoltage hysteresis protection circuit | |
| CN116961640B (en) | Half-duplex differential interface circuit for isolator and isolator | |
| CN213417822U (en) | Flow signal processing system of grouting machine | |
| CN212432410U (en) | Online installation detection device is pressed in area | |
| CN203224808U (en) | Hysteresis loop current control circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20201218 |
|
| RJ01 | Rejection of invention patent application after publication |