CN219608765U - Circuit device for detecting COD by ultraviolet spectrum - Google Patents
Circuit device for detecting COD by ultraviolet spectrum Download PDFInfo
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- CN219608765U CN219608765U CN202320228496.2U CN202320228496U CN219608765U CN 219608765 U CN219608765 U CN 219608765U CN 202320228496 U CN202320228496 U CN 202320228496U CN 219608765 U CN219608765 U CN 219608765U
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- resistor
- operational amplifier
- deep ultraviolet
- led lamp
- conversion element
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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
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
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Abstract
The utility model discloses a circuit device for detecting COD by ultraviolet spectrum, which comprises a mounting shell, a driving unit, a photoelectric sensing unit, a deep ultraviolet LED lamp and a photoelectric conversion element, wherein the mounting shell is provided with a containing cavity; the circuit device for detecting COD by ultraviolet spectrum can be effectively improved in stability by fixing the driving unit, the photoelectric sensing unit, the deep ultraviolet LED lamp and the photoelectric conversion element on the mounting shell, and poor contact caused by vibration is reduced. The deep ultraviolet LED lamp can emit deep ultraviolet light, the photoelectric conversion element can generate corresponding signals after receiving the deep ultraviolet light, so that COD detection is realized, and the stable reliability of signal transmission can be effectively improved through amplification and filtering treatment of the photoelectric sensing unit.
Description
Technical Field
The utility model particularly relates to a circuit device for detecting COD by ultraviolet spectrum.
Background
Chemical oxygen demand, COD, is the amount of reducing substances in a water sample that need to be oxidized measured chemically. Oxygen equivalent of substances (typically organic substances) that can be oxidized by strong oxidants in wastewater, wastewater treatment plant effluent and contaminated water. The chemical oxygen demand is one of the most important comprehensive indexes of organic pollution in water environment monitoring, can be used for judging the relative content of organic matters in water bodies, and is an important and easily obtained parameter for researching river and industrial wastewater and evaluating the effect of sewage treatment plants. And plays a great role in water environment management and industrial pollution source general investigation in China, and is one of pollutant total control indexes regulated by the national environmental protection agency.
The principle of the ultraviolet spectroscopic optical detection method of chemical oxygen demand COD is the lambert's law requiring parallel light. At present, a hydrogen lamp, a deuterium lamp, a mercury lamp, a xenon lamp and the like are mostly adopted, the working current of the light sources is larger during working, the service life of the light sources is shorter, a driving circuit is complex, the price is very high, and the light sources are not suitable for on-line measurement; meanwhile, the light sources are large in size, the optical mounting structure is very complex, and batch production is not facilitated. In order to solve the above problems, a circuit device for detecting COD by ultraviolet spectrum is provided.
Disclosure of Invention
The technical problems to be solved by the utility model are as follows: the circuit device for detecting the COD by the ultraviolet spectrum has the advantages of simple structure, sensitive driving response, long service life and low cost.
In order to solve the technical problems, the utility model is solved by the following technical scheme: the utility model provides a circuit arrangement of ultraviolet spectrum detection COD, includes installation shell, drive unit, photoelectric sensing unit, deep ultraviolet LED lamp and photoelectric conversion element, the installation shell be provided with and hold the chamber, deep ultraviolet LED lamp and photoelectric conversion element fix respectively on the both sides wall of installation shell and set up relatively, drive unit be used for driving deep ultraviolet LED lamp work and emission deep ultraviolet, photoelectric sensing unit be used for receiving photoelectric conversion element's signal and amplify the filtering treatment.
Further, the driving unit comprises a first resistor, a second resistor, a first capacitor and a driving chip, a power supply is connected with one end of the second resistor, the other end of the second resistor is connected with the positive electrode of the deep ultraviolet LED lamp, the negative electrode of the deep ultraviolet LED lamp is connected with the VP end of the driving chip, the VDD end of the driving chip is connected with the control end through the first resistor, the VN end of the driving chip is grounded, and the CDD end of the driving chip is connected with the VN end in series through the first capacitor; the control device has the advantages that the control reliability of the deep ultraviolet LED lamp can be effectively guaranteed through the arranged driving chip, and stable current driving is provided for the deep ultraviolet LED lamp.
Further, the photoelectric sensing unit comprises a conversion module, an amplifying module and a filtering module which are sequentially arranged, the signals of the photoelectric conversion element are converted into voltage signals through the conversion module, and the converted voltage signals are amplified through the amplifying module and are transmitted to the filtering module; the photoelectric sensing device has the advantages that the current signal can be converted into the voltage signal through the conversion module arranged on the photoelectric sensing unit so as to be convenient to transmit, and meanwhile, the transmitted voltage signal is amplified through the amplified signal so as to be convenient for subsequent identification, transmission and processing. And the interference of clutter on signal transmission in the voltage signal transmission process can be effectively filtered through the set filtering module.
Further, the conversion module comprises a first operational amplifier, the amplification module comprises a second operational amplifier, the filtering module comprises a third operational amplifier, the positive electrode of the photoelectric conversion element is grounded, the negative electrode of the photoelectric conversion element is connected with the inverting input end of the first operational amplifier, a fourth resistor is connected in series between the inverting input end of the first operational amplifier and the output end of the first operational amplifier, the two ends of the fourth resistor are connected with a third capacitor in parallel, the non-inverting input end of the first operational amplifier is connected with a ground wire through the third resistor, and the two ends of the third resistor are connected with a second capacitor in parallel; the output end of the first operational amplifier is connected with the non-inverting input end of the second operational amplifier through a fifth resistor, the non-inverting input end of the second operational amplifier is grounded through a fourth capacitor, the inverting input end of the second operational amplifier is grounded through a sixth resistor, the inverting input end of the second operational amplifier is connected with the output end of the second operational amplifier through a seventh resistor, and the two ends of the seventh resistor are connected with the fifth capacitor in parallel; the output end of the second operational amplifier is connected with one end of an eighth resistor, the other end of the eighth resistor is connected with one end of a ninth resistor and one end of a sixth capacitor, the other end of the ninth resistor is connected with one end of a seventh capacitor and the in-phase input end of the third operational amplifier, the other end of the seventh capacitor is grounded, the other end of the sixth capacitor is connected with the output end of the third operational amplifier, the inverting input end of the third operational amplifier is connected with the output end of the third operational amplifier through an eleventh resistor, the inverting input end of the third operational amplifier is grounded through a tenth resistor, the output end of the third operational amplifier is connected with one end of a twelfth resistor, and the other end of the twelfth resistor is a signal output end.
Furthermore, the deep ultraviolet LED lamp and the photoelectric conversion element are concentrically arranged, and the distance is more than 10 CM; the advantage lies in through concentric deep ultraviolet LED lamp and the photoelectric conversion component that sets up can effectively ensure the reliability that deep ultraviolet LED lamp shines, can be better transmission to photoelectric conversion component department with light in liquid.
Further, the second resistor is a power resistor for voltage division and current limiting; the power type LED lamp has the advantages that voltage applied to the deep ultraviolet LED lamp can be divided and limited through the second resistor with the power type, burning of the deep ultraviolet LED lamp caused by overhigh voltage is avoided, and the service life is prolonged.
Furthermore, the deep ultraviolet LED lamp and the photoelectric conversion element are respectively fixed on two opposite side walls of the mounting shell, the driving unit is fixed on the outer side wall of the mounting shell corresponding to the deep ultraviolet LED lamp, and the photoelectric sensing unit is fixed on the outer side wall of the mounting shell corresponding to the photoelectric conversion element; the driving device has the advantages that the driving unit and the photoelectric sensing unit are respectively fixed on two side edges of the mounting shell, so that the extra resistance between the driving unit and the deep ultraviolet LED lamp and the extra resistance between the photoelectric sensing unit and the photoelectric conversion element can be effectively reduced, the driving capability is improved, meanwhile, the control sensitivity can be increased, the stability of the driving unit and the photoelectric leaflet unit is further improved, and the unstable phenomenon of connection between the driving unit and the deep ultraviolet LED lamp and the unstable phenomenon of connection between the photoelectric sensing unit and the photoelectric conversion element caused by vibration are avoided.
Compared with the prior art, the utility model has the following beneficial effects: the circuit device for detecting COD by ultraviolet spectrum can be effectively improved in stability by fixing the driving unit, the photoelectric sensing unit, the deep ultraviolet LED lamp and the photoelectric conversion element on the mounting shell, and poor contact caused by vibration is reduced. Meanwhile, the deep ultraviolet LED lamp can emit deep ultraviolet light, the photoelectric conversion element can generate corresponding signals after receiving the deep ultraviolet light, so that COD detection is realized, and the stable reliability of signal transmission can be effectively improved through amplification and filtering treatment of the photoelectric sensing unit.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic block diagram of a circuit of the present utility model;
FIG. 2 is a schematic circuit diagram of a driving unit according to the present utility model;
FIG. 3 is a schematic circuit diagram of a photoelectric sensing unit according to the present utility model;
fig. 4 is a schematic structural view of the mounting case of the present utility model.
Detailed Description
The present utility model is described in further detail below with reference to the accompanying drawings.
The following description is presented to enable one of ordinary skill in the art to practice the utility model. The preferred embodiments in the following description are by way of example only and other obvious variations will occur to those skilled in the art. The basic principles of the utility model defined in the following description may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the utility model.
It will be appreciated by those skilled in the art that in the present disclosure, the terms "longitudinal," "transverse," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc. indicate orientations or positions based on the orientation or positional relationship shown in the drawings, which are merely for convenience in describing the present simplified description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and thus the above terms are not to be construed as limiting the present utility model.
The circuit device for detecting COD by ultraviolet spectrum as shown in the attached drawings 1-4 comprises a mounting shell 1, a driving unit 2, a photoelectric sensing unit 3, a deep ultraviolet LED lamp D1 and a photoelectric conversion element D2, wherein the mounting shell 1 is provided with a containing cavity 4 for containing liquid to be detected, the deep ultraviolet LED lamp D1 and the photoelectric conversion element D2 are respectively fixed on two opposite side walls of the mounting shell 1 and are oppositely arranged, specifically, the deep ultraviolet LED lamp D1 and the photoelectric conversion element D2 are respectively fixed on two opposite side walls of the mounting shell 1, the driving unit 2 is fixed on the outer side wall of the mounting shell 1 corresponding to the deep ultraviolet LED lamp D1, and the photoelectric sensing unit 3 is fixed on the outer side wall of the mounting shell 1 corresponding to the photoelectric conversion element D2; preferably, the deep ultraviolet LED lamp D1 and the photoelectric conversion element D2 are concentrically arranged, and the distance is more than 10CM, so that the reliable attenuation of the deep ultraviolet light after passing through the liquid is ensured and the deep ultraviolet light is transmitted to the photoelectric conversion element D2. The photoelectric conversion element D2 is a silicon carbide photoelectric sensor, and has the advantages of small occupied volume, sensitive response and high photoelectric conversion efficiency.
The driving unit 2 is used for driving the deep ultraviolet LED lamp D1 to work and emit deep ultraviolet, and the photoelectric sensing unit 3 is used for receiving the signal of the photoelectric conversion element D2 and performing amplification filtering processing. Specifically, the driving unit 2 includes a first resistor R1, a second resistor R2, a first capacitor C1 and a driving chip U1, the driving chip is a constant current driving chip NU501, a power supply is connected with one end of the second resistor R2, the other end of the second resistor R2 is connected with the positive electrode of the deep ultraviolet LED lamp D1, the negative electrode of the deep ultraviolet LED lamp D1 is connected with the VP end of the driving chip U1, the VDD end of the driving chip U1 is connected with the control end through the first resistor R1, the VN end of the driving chip U1 is grounded, and the CDD end of the driving chip U1 is connected with the VN end in series through the first capacitor C1. The power supply provides 8V voltage for the deep ultraviolet LED lamp D1 to use, simultaneously outputs square wave control drive chip U1 work through outside controller, and outside controller can have microcontroller system to realize, belongs to prior art.
The photoelectric sensing unit 3 comprises a conversion module, an amplifying module and a filtering module which are sequentially arranged, wherein a signal of the photoelectric conversion element D2 is converted into a voltage signal through the conversion module, and the converted voltage signal is amplified through the amplifying module and is transmitted to the filtering module; specifically, the conversion module comprises a first operational amplifier U2, the amplification module comprises a second operational amplifier U3, the filtering module comprises a third operational amplifier U4, the positive electrode of the photoelectric conversion element D2 is grounded, the negative electrode of the photoelectric conversion element D2 is connected with the inverting input end of the first operational amplifier U2, a fourth resistor R4 is connected in series between the inverting input end of the first operational amplifier U2 and the output end of the first operational amplifier U2, the two ends of the fourth resistor R4 are connected with a third capacitor C3 in parallel, the non-inverting input end of the first operational amplifier U2 is connected with the ground wire through the third resistor R3, and the two ends of the third resistor R3 are connected with a second capacitor C2 in parallel; the output end of the first operational amplifier U2 is connected with the non-inverting input end of the second operational amplifier U3 through a fifth resistor R5, the non-inverting input end of the second operational amplifier U3 is grounded through a fourth capacitor C4, the inverting input end of the second operational amplifier U3 is grounded through a sixth resistor R6, the inverting input end of the second operational amplifier U3 is connected with the output end of the second operational amplifier U3 through a seventh resistor R7, and the two ends of the seventh resistor R7 are connected with a fifth capacitor C5 in parallel; the output end of the second operational amplifier U3 is connected with one end of an eighth resistor R8, the other end of the eighth resistor R8 is connected with one end of a ninth resistor R9 and one end of a sixth capacitor C6, the other end of the ninth resistor R9 is connected with one end of a seventh capacitor C7 and the in-phase input end of a third operational amplifier U4, the other end of the seventh capacitor C7 is grounded, the other end of the sixth capacitor C6 is connected with the output end of the third operational amplifier U4, the inverting input end of the third operational amplifier U4 is connected with the output end of the third operational amplifier U4 through an eleventh resistor R11, the inverting input end of the third operational amplifier U4 is grounded through a tenth resistor R10, the output end of the third operational amplifier U4 is connected with one end of a twelfth resistor R12, and the other end of the twelfth resistor R12 is a signal output end. The power supply provides 5 volts for the first operational amplifier U2, the second operational amplifier U3 and the third operational amplifier U4; the deep ultraviolet LED lamp D1 is driven by the driving unit 2 to emit deep ultraviolet light in the use process, liquid to be detected is placed in the accommodating cavity of the installation shell 1, the deep ultraviolet light irradiates the photoelectric conversion element D2 after passing through the liquid to be detected, current passing through the photoelectric conversion element D2 is converted, the signal is transmitted to the first operational amplifier U2 to be converted into voltage signal change, then the voltage signal with small change is amplified by the second operational amplifier U3, the voltage signal with small change is converted into voltage identifiable by an external system, then the voltage signal is subjected to low-pass filtering by the third operational amplifier U4, and clutter filtering is carried out to reduce interference. The external system can be a microprocessor system, belongs to the prior art, and reacts the chemical oxygen demand in the liquid to be detected through the change of the signal, thereby completing the detection.
It should be noted that, the above-mentioned second resistor R2 is a power resistor for voltage division and current limiting, and the voltage applied to the deep ultraviolet LED lamp D1 can be divided and current limited by setting the power type second resistor R2, so as to avoid burning the deep ultraviolet LED lamp D1 due to too high voltage, and prolong the service life.
It will be appreciated by persons skilled in the art that the embodiments of the utility model described above and shown in the drawings are by way of example only and are not limiting. The objects of the present utility model have been fully and effectively achieved. The functional and structural principles of the present utility model have been shown and described in the examples and embodiments of the utility model may be modified or practiced without departing from the principles described.
Claims (7)
1. The circuit device for detecting COD by ultraviolet spectrum is characterized by comprising a mounting shell, a driving unit, a photoelectric sensing unit, a deep ultraviolet LED lamp and a photoelectric conversion element, wherein the mounting shell is provided with a containing cavity, the deep ultraviolet LED lamp and the photoelectric conversion element are respectively fixed on two sides of the mounting shell and are oppositely arranged, the driving unit is used for driving the deep ultraviolet LED lamp to work and emit deep ultraviolet, and the photoelectric sensing unit is used for receiving signals of the photoelectric conversion element and amplifying and filtering the signals.
2. The circuit device for detecting COD according to claim 1, wherein the driving unit comprises a first resistor, a second resistor, a first capacitor and a driving chip, a power supply is connected with one end of the second resistor, the other end of the second resistor is connected with the positive electrode of the deep ultraviolet LED lamp, the negative electrode of the deep ultraviolet LED lamp is connected with the VP end of the driving chip, the VDD end of the driving chip is connected with the control end through the first resistor, the VN end of the driving chip is grounded, and the CDD end of the driving chip is connected with the VN end in series through the first capacitor.
3. The circuit device for detecting COD by ultraviolet spectrum according to claim 1, wherein the photoelectric sensing unit comprises a conversion module, an amplifying module and a filtering module, wherein the conversion module is sequentially arranged, the signals of the photoelectric conversion element are converted into voltage signals by the conversion module, and the converted voltage signals are amplified by the amplifying module and are transmitted to the filtering module.
4. The circuit device for detecting COD by ultraviolet spectrum according to claim 3, wherein the conversion module comprises a first operational amplifier, the amplification module comprises a second operational amplifier, the filtering module comprises a third operational amplifier, the positive electrode of the photoelectric conversion element is grounded, the negative electrode of the photoelectric conversion element is connected with the inverting input end of the first operational amplifier, a fourth resistor is connected in series between the inverting input end of the first operational amplifier and the output end of the first operational amplifier, the two ends of the fourth resistor are connected with a third capacitor in parallel, the non-inverting input end of the first operational amplifier is connected with a ground wire through the third resistor, and the two ends of the third resistor are connected with a second capacitor in parallel; the output end of the first operational amplifier is connected with the non-inverting input end of the second operational amplifier through a fifth resistor, the non-inverting input end of the second operational amplifier is grounded through a fourth capacitor, the inverting input end of the second operational amplifier is grounded through a sixth resistor, the inverting input end of the second operational amplifier is connected with the output end of the second operational amplifier through a seventh resistor, and the two ends of the seventh resistor are connected with the fifth capacitor in parallel; the output end of the second operational amplifier is connected with one end of an eighth resistor, the other end of the eighth resistor is connected with one end of a ninth resistor and one end of a sixth capacitor, the other end of the ninth resistor is connected with one end of a seventh capacitor and the in-phase input end of the third operational amplifier, the other end of the seventh capacitor is grounded, the other end of the sixth capacitor is connected with the output end of the third operational amplifier, the inverting input end of the third operational amplifier is connected with the output end of the third operational amplifier through an eleventh resistor, the inverting input end of the third operational amplifier is grounded through a tenth resistor, the output end of the third operational amplifier is connected with one end of a twelfth resistor, and the other end of the twelfth resistor is a signal output end.
5. The circuit device for detecting COD according to claim 1, wherein the deep ultraviolet LED lamp and the photoelectric conversion element are concentrically arranged with a distance of 10CM or more.
6. The circuit device for detecting COD by ultraviolet spectroscopy according to claim 2 wherein the second resistor is a power resistor for voltage dividing and current limiting.
7. The circuit device for detecting COD according to claim 1, wherein the deep ultraviolet LED lamp and the photoelectric conversion element are respectively fixed on two opposite side walls of the installation shell, the driving unit is fixed on the outer side wall of the installation shell corresponding to the deep ultraviolet LED lamp, and the photoelectric sensing unit is fixed on the outer side wall of the installation shell corresponding to the photoelectric conversion element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320228496.2U CN219608765U (en) | 2023-02-16 | 2023-02-16 | Circuit device for detecting COD by ultraviolet spectrum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320228496.2U CN219608765U (en) | 2023-02-16 | 2023-02-16 | Circuit device for detecting COD by ultraviolet spectrum |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219608765U true CN219608765U (en) | 2023-08-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320228496.2U Active CN219608765U (en) | 2023-02-16 | 2023-02-16 | Circuit device for detecting COD by ultraviolet spectrum |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219608765U (en) |
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2023
- 2023-02-16 CN CN202320228496.2U patent/CN219608765U/en active Active
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