CN212364072U - Turbidity detector - Google Patents

Abstract

The utility model provides a turbidity detector, wherein a circuit module and an optical module are connected with each other; the optical module is arranged at the first end of the shell and is detachably connected with the first end of the shell; the receiving unit and the transmitting unit are respectively communicated with the outside of the shell through the light guide columns, the transmitting unit emits detection light according to the detection control instruction, and the receiving unit receives the detection light and transmits a received light signal to the circuit module; the control unit is respectively connected with the receiving unit and the transmitting unit through the data transmission processing unit; the control unit sends a detection control instruction to the transmitting unit; the control unit obtains the received light signal through the receiving unit and calculates to obtain water quality turbidity data. The utility model adopts the filter plate to reduce the interference of sunlight to the sensor; transmitting square wave signals, and reducing the interference of light with the same wavelength in sunlight on received signals through processing the signals; the light receiving and transmitting path with a certain angle is adopted, the light radiation range is expanded, and the detection accuracy of the sensor is improved.

Description

Turbidity detector

Technical Field

The utility model relates to a quality of water turbidity detects technical field, especially relates to a turbidity detector.

Background

Turbidity is the degree of obstruction that occurs when suspended matter in water passes through to light. Turbidity in water is generally caused by suspended matter, which is generally soil, sand, fine organic and inorganic matter, plankton, microorganisms, colloidal matter, and the like. The turbidity of water is related not only to the content of suspended substances in the water, but also to their size, shape, refractive index, etc.

Currently, turbidity is generally estimated by measuring the degree of transmitted light intensity attenuation caused by the obstruction of particles in a sample by using a colorimeter or a spectrophotometer. The turbidity data obtained by the estimation method is inaccurate, and the accuracy cannot be achieved. And the interference of sunlight exists in some environment, and the sunlight shines aquatic, can further influence the accuracy and the precision of turbidity detection, leads to the turbidity data of detection inaccurate, can't carry out the reference use in later stage.

SUMMERY OF THE UTILITY MODEL

In order to overcome the not enough among the above-mentioned prior art, the utility model provides a turbidity detector, include: the optical module comprises a shell, a light source and a light source, wherein a circuit module and an optical module are installed in the shell; the circuit module and the optical module are connected with each other;

the optical module is arranged at the first end of the shell and is detachably connected with the first end of the shell;

the optical module comprises a receiving unit and a transmitting unit;

the receiving unit and the transmitting unit are respectively communicated with the outside of the shell through the light guide columns, the transmitting unit emits detection light according to the detection control instruction, and the receiving unit receives the detection light and transmits a received light signal to the circuit module;

the circuit module includes: a data transmission processing unit and a control unit;

the control unit is respectively connected with the receiving unit and the transmitting unit through the data transmission processing unit;

the control unit sends a detection control instruction to the transmitting unit; the control unit obtains the received light signal through the receiving unit and calculates to obtain water quality turbidity data.

According to the technical scheme, the utility model has the advantages of it is following:

the turbidity detector and the detection method adopt a filter plate to reduce the interference of sunlight on a sensor; transmitting square wave signals, and reducing the interference of light with the same wavelength in sunlight on received signals through processing the signals; the light receiving and transmitting path with a certain angle is adopted, so that the light radiation range is expanded, and the detection accuracy of the sensor is improved; the turbidity detector has a standard Modbus communication protocol, can carry out water quality turbidity detection on line, supports online calibration, can upload detection data in time, and can acquire control data in real time.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic view of a turbidity measuring apparatus as a whole;

FIG. 2 is an exploded view of a turbidity monitor;

FIG. 3 is a schematic diagram of a data transmission processing unit;

FIG. 4 is a perspective view of the probe;

FIG. 5 is a front view of the probe;

FIG. 6 is a side view of the probe;

FIG. 7 is a cross-sectional view of the probe;

FIG. 8 is a top view of the probe;

FIG. 9 is an I/V conversion circuit diagram;

FIG. 10 is an enlarged circuit diagram;

FIG. 11 is a temperature measurement circuit diagram;

FIG. 12 is a circuit diagram of an excitation light source;

FIG. 13 is a high pass filter clamp circuit diagram;

FIG. 14 is a diagram of an active detection circuit;

FIG. 15 is a negative voltage circuit diagram;

FIG. 16 is a circuit diagram of range switching;

FIG. 17 is a flow chart of a turbidity detection method.

Detailed Description

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the examples described in connection with the embodiments disclosed herein may be embodied in electronic hardware, computer software, or combinations of both, and that the components and steps of the examples have been described in a functional general in the foregoing description for the purpose of illustrating clearly the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

The block diagrams shown in the figures are functional entities only and do not necessarily correspond to physically separate entities. I.e. these functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor means and/or microcontroller means.

It will be understood that when an element or layer is referred to as being "on," connected to "or" coupled to "another element or layer, it can be directly on, connected or coupled to the other element or layer, or intervening elements or layers may be present. In contrast, when an element is referred to as being "directly on," "directly connected to" or "directly coupled to" another element or layer, there are no intervening elements or layers present. Like numbers refer to like elements throughout. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The utility model provides a turbidity detector, as shown in figures 1 to 16, include: the optical module comprises a shell 1, wherein a circuit module 2 and an optical module are installed in the shell 1; the circuit module 2 and the optical module 3 are connected to each other;

the optical module 3 is arranged at the first end of the shell 1 and is detachably connected with the first end of the shell 1;

specifically, the shell 1 is of a cylindrical structure, and a first end of the shell 1 is provided with an internal thread; the second end of the shell 1 is in threaded connection with a waterproof sheath joint 6; the external thread seat 51 is provided with an external thread matched with the internal thread; the external thread seat 51 is in thread fit connection with the internal thread of the shell 1.

The optical module 3 is provided with a receiving unit 31 and a transmitting unit 32; the receiving unit 31 and the transmitting unit 32 are respectively communicated with the outside of the shell 1 through the light guide column 33, the transmitting unit 32 emits detection light according to a detection control instruction, and the receiving unit 31 receives the detection light and transmits a received light signal to the circuit module 2;

further, the optical module 3 is provided with a probe 5; the probe 5 is provided with an external thread seat 51 and a support 52; the external thread seat 51 is provided with a receiving light path 53, a transmitting light path 54, a filtering mounting hole 55, a light guide mounting hole 56, a fastening hole 59, a glue filling vent hole 60 and a temperature sensing mounting hole 57; the support 52 is provided with a gluing channel 58; the gluing channel 58 is communicated with the glue filling vent hole 60; one end of the support 52 is connected with the external thread seat 51; the support member 52 is provided with a support surface, and two fixing holes 11 are arranged on the support surface; the circuit module 2 is arranged on the supporting surface of the supporting piece 52 and fixedly connected through the fixing hole 11;

therefore, the circuit module 2 can be pushed into the shell 1 through the probe 5 and then is in threaded connection with the external thread seat 51 through the internal thread of the shell 1. The light guide column 33 and the port of the light guide mounting hole 56 are sealed by sealant; the filter 34 is sealed with the end of the filter mounting hole 55 by a sealant. The port of each mounting hole is sealed, and the outer surface of the probe 5 is processed, so that the outer surface of the probe 5 is smooth, and the problem that the breeding of algae is caused due to the fact that the outer surface of the probe 5 is not smooth when the probe is soaked in water for a long time to influence the detection precision of an instrument is avoided.

The utility model discloses set up three encapsulating air vent 60 and avoided because only done one, the colloid circulation is not smooth. The three glue filling vent holes 60 enable the internal pressure and the external pressure to be the same, the glue flows smoothly, and glue is convenient to glue.

The first end of the shell 1 is provided with at least two threaded sections 63; each thread section is arranged according to different thread standards, and a distance is configured between the thread sections.

In order to realize that the turbidity detector is connected with the detection equipment, the detection equipment acquires the turbidity information of water through the turbidity detector. The first end of the shell 1 is provided with at least two threaded sections 63; each thread section is arranged according to different thread standards, and a distance is configured between the thread sections. The thread standard of the thread section can adopt English standard or national standard. Of course, threads with different sizes can be adopted, the connecting caliber can be matched and connected with various devices, and the use convenience of the device is improved.

The receiving unit 31 is mounted in the receiving optical path 53; the emitting unit 32 is mounted within the emitting light passageway 54; the light guide columns 33 are installed in the light guide installation holes 56;

the filter 34 is mounted in the filter mounting hole 55; the temperature measuring circuit 4 is installed in the temperature sensing installation hole 57;

the fastening holes 59 are three fastening holes provided to the male screw holder 51, and the three fastening holes are capable of allowing a fastening tool to be inserted. Since the male socket 51 and the housing are relatively small in volume and cannot be tightened directly by hand, the threaded connection between the male socket 51 and the male socket 51 is assisted by means of a tightening tool. The externally threaded socket 51 is fixed to the housing.

In the present invention, in order to reduce the interference of the light with the same wavelength in the sunlight to the received signal, the receiving unit 31 receives the detection light through the optical filter 34; the filter 34 adopts a 940nm narrow-band filter, the cut-off depth is OD2-OD3, and the transmittance is preferably 0.1% -1%; two filters are arranged on the receiving end of the receiving unit 31 in an overlapping manner; the influence of sunlight on the receiving device can be reduced,

the central line of the receiving unit 31 intersects the central line of the transmitting unit 32 at an angle theta in the range of 50-70 degrees.

The receiving unit 31 employs an infrared receiving diode; the transmitting unit 32 employs an infrared emitting diode. The infrared receiving diode adopts a PD type diode, has small volume and low cost compared with a silicon photocell, has small dark current compared with a PT diode, high response speed, better linearity and strong anti-interference performance.

The angle between the infrared receiving diode and the infrared emitting diode is 50-70 degrees, preferably 60 degrees, so that the light radiation range is expanded, and the receiving accuracy of the sensor can be improved. The smaller the angle between the infrared receiving diode and the infrared emitting diode is, the larger the radiation range is, but the light intensity can be weakened along with the enlargement of the range, the comprehensive analysis shows that the angle between the receiving end and the emitting end is 50-70 degrees, the measurement accuracy is the highest, and the effect is the best. Therefore, the light receiving and transmitting path with a certain angle is formed, the light radiation range is expanded, and the detection accuracy of the sensor is improved.

The circuit module 2 includes: a data transmission processing unit and a control unit; the control unit is respectively connected with the receiving unit 31 and the transmitting unit 32 through the data transmission processing unit; the control unit sends a detection control instruction to the transmitting unit 32; the control unit obtains the received light signal through the receiving unit 31 and calculates the water quality turbidity data.

The calculation mode of the control unit is calibration by adopting a two-point method; that is, the calculation is performed in two setting intervals of 400NTU and 1000 NTU. The method is based on that 400NTU and 1000NTU are two water quality division modes, namely division of water quality pollution conditions.

The control unit sends a corresponding instruction in the 400NTU turbidity standard solution or the 1000NTU turbidity standard solution, collects the current turbidity analog quantity, and calculates according to the following formula;

0-400 NTU: the current turbidity value is current analog quantity/400 turbidity value corresponding to the analog quantity is 400;

400 and 1000 NTU:

current turbidity value 1.3 current analog-400 corresponding analog/1000 corresponding analog-400 corresponding analog 600+ 400.

The above disclosed apparatus may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may also be an electric, mechanical or other form of connection.

As the utility model provides a data transmission processing unit includes: as shown in fig. 2, an excitation light source circuit, an I/V conversion circuit, a high-pass filter clamp circuit, an active detection circuit, an amplification circuit, a range switching circuit, an AD conversion circuit, a temperature measurement circuit 4, and a negative voltage circuit for supplying a negative voltage to the inside of the data transmission processing unit;

the exciting light source circuit is connected with the emitting unit 32, the emitting unit 32 emits infrared light into water according to a preset frequency through the exciting light source circuit, the infrared light contacts particles in the water, is reflected and scattered, is received by the receiving unit 31, is converted into corresponding current according to the captured signal intensity, is subjected to signal processing through the I/V conversion circuit, is processed through the high-pass filter clamping circuit, the active detection circuit, the amplifying circuit and the AD conversion circuit and is transmitted to the control unit for processing; the control unit obtains the temperature value of the water quality through the temperature measuring circuit 4; the control unit processes and calculates the turbidity value of the water quality through a preset algorithm; the control unit obtains the range switching control instruction through the range switching circuit and executes the range switching control instruction. The user can select according to different measuring ranges.

The instrument supports 12V-24V direct current power supply, and can automatically perform sunlight compensation, temperature compensation and the like.

The data transmission processing unit further includes: a data transmission circuit; the control unit is connected with the external equipment and the upper computer through a data transmission circuit and a standard ModBus standard protocol, performs read-write operation based on the external equipment, and is used for reading, calibrating and modifying the equipment ID of the turbidity value of water quality and returning an error code; the control unit can be connected with an upper computer or a server or a control device in a wireless or wired mode.

The control unit adopts an STM32F103C8T6 singlechip; the data transmission circuit adopts a 485 equipment standard ModBus standard protocol.

The method and apparatus of the present invention may be implemented in a number of ways. For example, the methods and apparatus of the present invention may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order for the steps of the method is for illustrative purposes only, and the steps of the method of the present invention are not limited to the order specifically described above unless specifically stated otherwise. Furthermore, in some embodiments, the present invention may also be embodied as programs recorded in a recording medium, the programs including machine readable instructions for implementing a method according to the present invention. Thus, the present invention also covers a recording medium storing a program for executing the method according to the present invention.

The control unit may include one or more processors executing, for example, one or more Digital Signal Processors (DSPs), general purpose microprocessors, Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs), or other equivalent integrated or discrete logic circuitry. Thus, the term "processor," as used herein, may refer to any of the foregoing structure or any other structure more suitable for implementing the techniques described herein. In addition, in some aspects, the functionality described in this disclosure may be provided in software modules and hardware modules.

The specific form of each circuit is as follows:

the I/V conversion circuit includes: an operational amplifier U1, a capacitor C1, a resistor R30 and a diode D1;

five pins of the operational amplifier U1 are connected with the input end of the I/V conversion circuit of the anode of the diode D1 respectively; a cathode of the diode D1, a six-pin operational amplifier U1, a first end of the capacitor C1 and a first end of the resistor R30 are connected together; the four pins of the operational amplifier are connected with a power supply; one pin of the transporting and placing device is grounded; the second end of the capacitor C1 and the second end of the resistor R30 are respectively connected with the output end of the I/V conversion circuit;

the amplifying circuit includes: the circuit comprises a resistor R32, a resistor R33, a resistor R31, a resistor R35 and an operational amplifier U2; the three pins of the operational amplifier U2 and the first end of the resistor R35 are respectively connected with the input end of the amplifying circuit; the second end of the resistor R35 is connected with the output end of the amplifying circuit at the second end of the resistor R32; two pins of the operational amplifier U2 are respectively connected with the second end of the resistor R31 and the first end of the resistor R33; a first end of the resistor R31 is grounded; the second end of the resistor R33 is respectively connected with one pin of the operational amplifier U2 and the first end of the resistor R32; the four pins of the operational amplifier U2 are connected with a power supply; five feet of the operational amplifier U2 are grounded.

The temperature measurement circuit includes: the temperature sensing element U8, the resistor R8, the resistor R9 and the capacitor C2; the first end of the resistor R8 is connected with a power supply, and the second end of the resistor R8 is connected with the first end of the temperature sensing element U8; a second end of the temperature sensing element U8 is respectively connected with a first end of a resistor R9 and a first end of a capacitor C2; the second end of the resistor R9 and the second end of the capacitor C2 are respectively grounded;

the excitation light source circuit includes: the LED comprises a resistor R15, a resistor R16, a resistor R17, a resistor R18, a field effect transistor Q1 and a light emitting diode D2; the first end of the resistor R17 and the first end of the resistor R18 are respectively connected with a power supply; the second end of the resistor R17 and the second end of the resistor R18 are respectively connected with the anode of the light-emitting diode D2; the cathode of the light-emitting diode D2 is connected with the D pole of the field-effect transistor Q1 through a resistor R15; the G pole of the field effect transistor Q1 is connected with the control input end of the exciting light source circuit through a resistor R16; the S-pole of the fet Q1 is grounded.

The high pass filter clamp circuit includes: the circuit comprises a resistor R11, a resistor R12, a resistor R13, a resistor R10 and a capacitor C3; the first end of the capacitor C3 is connected with the input end of the high-pass filtering clamping circuit; a second end of the capacitor C3 is respectively connected with a first end of the resistor R10 and a first end of the resistor R12; the second end of the resistor R10 and the first end of the resistor R11 are respectively grounded; the second end of the resistor R12, the second end of the resistor R12 and the first end of the resistor R13 are respectively connected with the output end of the high-pass filtering clamping circuit; the second end of the resistor R13 is connected with the power supply;

the active detection circuit includes: a resistor R1, a resistor R2, a resistor R3, a resistor R4, a diode D3, a diode D4 and an operational amplifier U3; the first end of the resistor R1 is connected with the input end of the active detection circuit; the second end of the resistor R1 is respectively connected with the first end of the resistor R2 and the three pins of the operational amplifier U3; two pins of the operational amplifier U3 are grounded through a resistor R3; five pins of the operational amplifier U3 are connected with the anode of a diode D3; the cathode of the diode D3 is respectively connected with the second end of the resistor R2 and the first end of the resistor R4; the second end of the resistor R4 is respectively connected with the output end of the active detection circuit and the anode of the diode D4; the cathode of the diode D4 is connected with the power supply.

The negative voltage circuit includes: a CE7660 chip, a capacitor C11, a capacitor C12, a capacitor C13 and a resistor R8; the two pins of the CE7660 chip are grounded through a capacitor C11; the three pins and the four pins of the CE7660 chip are grounded; the eight pins are connected with a positive power supply, the five pins are output pins, and the five pins are respectively connected with the first end of a capacitor C12, the first end of a capacitor C13 and the output end of a negative voltage circuit through a resistor R8; the second end of the capacitor C12 and the second end of the capacitor C13 are respectively grounded. The negative voltage circuit can provide-3.3 v voltage to further meet the measurement requirement, so that the detection is more accurate, and the normal work of the instrument is ensured.

The light source circuit, the I/V conversion circuit, the high-pass filter clamping circuit, the active detection circuit, the amplification circuit, the range switching circuit and the AD conversion circuit adopt CD4052 BCM.

The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.

The connection relationships among the above-described circuits are complementary, that is, the excitation light source circuit, the I/V conversion circuit, the high-pass filter clamp circuit, the active detector circuit, the amplifier circuit, the temperature measurement circuit 4, and the AD conversion circuit are provided in cooperation based on the measurement method according to the present apparatus. The circuit mode of mutual cooperation and mutual connection is provided.

As shown in fig. 17, the detection method of the turbidity detecting apparatus specifically includes:

the detection light is conducted into the water through the light guide channel;

the transmitting unit transmits infrared light to water according to a certain frequency to generate a square wave signal;

infrared light contacts particles in water, and reflected light is reflected and scattered, passes through the optical filter to filter visible light and interference light and is received by the receiving unit;

the receiving unit receives the detection light and transmits the received light signal to the circuit module;

converting the captured signal intensity into corresponding current, processing the current through an I/V conversion circuit, processing the current through a high-pass filter clamping circuit, an active detection circuit, a range switching circuit, an amplifying circuit and an AD conversion circuit, and transmitting the processed current to a control unit;

the control unit acquires the received signals and calculates to obtain water quality turbidity data;

and the control unit transmits the turbidity value and the temperature value to an upper computer or external equipment through a standard ModBus standard protocol and a preset communication mode.

The utility model discloses still include the calibration process to the turbidity detector, the calibration process is markd the instrument before detecting, makes the detector can satisfy the required precision when detecting.

Because the turbidity detector is usually placed in liquid for long time for detection, if data deviation occurs in the detection process, the precision cannot reach the preset requirement. At this time, the detector needs to be taken out from the detected liquid and placed in the solution between 0-400NTU and the solution between 400 and 1000NTU respectively for calibration.

Preferably, the calibration solution of the present invention uses water with a turbidity of 400NTU and water with a turbidity of 1000 NTU. The detector is calibrated by the two solutions, and the detection requirements are met.

The specific process of calibration is as follows:

placing the turbidity meter into a solution with turbidity ranging between 0-400NTU,

the transmitting unit transmits infrared light to water according to a certain frequency to generate a square wave signal;

the infrared light contacts the particles in the solution between 0 and 400NTU, and after reflection and scattering, the reflected light passes through the optical filter to filter visible light and interference light and is received by the receiving unit;

the receiving unit receives the detection light, transmits the received light signals to the data transmission processing unit for processing, and transmits the processed light signals to the control unit;

the control unit calculates according to the following formula to obtain water quality turbidity data;

current turbidity value-current analog/400 turbidity value corresponds to analog 400.

Further, the calibration method for the turbidity detector further comprises the following steps:

the turbidity meter was placed in a solution with a turbidity range between 400 and 1000NTU,

the transmitting unit transmits infrared light to water according to a certain frequency to generate a square wave signal;

the infrared light contacts the particles in the solution between 400 and 1000NTU, and after reflection and scattering, the reflected light passes through the optical filter to filter out visible light and interference light and is received by the receiving unit;

the receiving unit receives the detection light, transmits the received light signals to the data transmission processing unit for processing, and transmits the processed light signals to the control unit;

the control unit calculates according to the following formula to obtain water quality turbidity data;

current turbidity value 1.3 current analog-400 corresponding analog/1000 corresponding analog-400 corresponding analog 600+ 400.

Here, 400NTU and 1000NTU are two preset calibration points; the NTU may be not limited to 400NTU and 1000NTU, and may be 500NTU or 600NTU, for example, and the specific data is not limited. By adopting a two-point method, the calibration is convenient, the linearity is good, the measurement is more accurate, more precise measurement values can be realized, and the measurement requirements are ensured.

The turbidity monitor is a collection of exemplary elements and algorithm steps described in connection with the embodiments disclosed herein that can be implemented in electronic hardware, computer software, or combinations of both, and the exemplary components and steps have been described above generally in terms of their functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

The turbidity monitor can be written with program code for performing the operations of the present disclosure in any combination of one or more programming languages, including object-oriented and process-oriented programming languages such as Java, C + +, C, etc., as well as conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's computing device and partly on a remote computing device, or entirely on the remote computing device or server. In the case of a remote computing device, the remote computing device may be connected to the user computing device through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computing device (e.g., through the internet using an internet service provider).

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (7)

1. A turbidity meter, comprising: the optical module comprises a shell (1), wherein a circuit module (2) and an optical module (3) are installed in the shell (1); the circuit module (2) and the optical module (3) are connected with each other;

the optical module (3) is arranged at the first end of the shell (1) and is detachably connected with the first end of the shell (1);

the optical module (3) comprises a receiving unit (31) and a transmitting unit (32);

the receiving unit (31) and the transmitting unit (32) are respectively communicated with the outside of the shell (1) through the light guide column (33), the transmitting unit (32) emits detection light according to a detection control instruction, and the receiving unit (31) receives the detection light and transmits a received light signal to the circuit module (2);

the circuit module (2) comprises: a data transmission processing unit and a control unit;

the control unit is respectively connected with the receiving unit (31) and the transmitting unit (32) through the data transmission processing unit;

the control unit sends a detection control instruction to the transmitting unit (32); the control unit obtains the received light signal through the receiving unit (31) and calculates to obtain water quality turbidity data.

2. A turbidity measuring instrument according to claim 1,

the data transmission processing unit further includes: a data transmission circuit;

the control unit is connected with the external equipment and the upper computer through a data transmission circuit and a standard ModBus standard protocol, performs read-write operation based on the external equipment, and is used for reading, calibrating and modifying the equipment ID of the turbidity value of water quality and returning an error code;

a receiving unit (31) that receives the detection light through a filter (34);

the optical filter (34) adopts a 940nm narrow-band optical filter, the cut-off depth is OD2-OD3, and the transmittance is 0.1% -1%; at least two filters are arranged on the receiving end of the receiving unit (31) in an overlapping mode;

the central line of the receiving unit (31) and the central line of the transmitting unit (32) are intersected, and the intersecting angle theta is in the range of 50-70 degrees.

3. A turbidity measuring instrument according to claim 1,

the optical module (3) is also provided with a probe (5);

the probe (5) is provided with an external thread seat (51) and a support piece (52);

the external thread seat (51) is provided with a receiving light passage (53), a transmitting light passage (54), a filtering mounting hole (55), a light guide mounting hole (56), a fastening hole (59), a glue filling vent hole (60) and a temperature sensing mounting hole (57);

the supporting piece (52) is provided with a gluing channel (58);

the gluing channel (58) is communicated with the glue filling vent hole (60);

the receiving unit (31) is installed in the receiving light path (53);

the emitting unit (32) is mounted in the emitting light path (54);

the light guide column (33) is arranged in the light guide mounting hole (56);

the filter (34) is arranged in the filter mounting hole (55);

the temperature measuring circuit (4) is arranged in the temperature sensing mounting hole (57);

the shell (1) is of a cylindrical structure, and an internal thread is arranged at the first end of the shell (1);

the second end of the shell (1) is in threaded connection with a waterproof sheath joint (6);

the external thread seat (51) is provided with an external thread matched with the internal thread;

the external thread seat (51) is in thread fit connection with the internal thread of the shell (1).

4. A turbidity measuring instrument according to claim 1,

the I/V conversion circuit includes: an operational amplifier U1, a capacitor C1, a resistor R30 and a diode D1;

five pins of the operational amplifier U1 are connected with the input end of the I/V conversion circuit of the anode of the diode D1 respectively;

a cathode of the diode D1, a six-pin operational amplifier U1, a first end of the capacitor C1 and a first end of the resistor R30 are connected together;

the four pins of the operational amplifier are connected with a power supply;

one pin of the transporting and placing device is grounded;

the second end of the capacitor C1 and the second end of the resistor R30 are respectively connected with the output end of the I/V conversion circuit;

the amplifying circuit includes: the circuit comprises a resistor R32, a resistor R33, a resistor R31, a resistor R35 and an operational amplifier U2;

the three pins of the operational amplifier U2 and the first end of the resistor R35 are respectively connected with the input end of the amplifying circuit;

the second end of the resistor R35 is connected with the output end of the amplifying circuit at the second end of the resistor R32;

two pins of the operational amplifier U2 are respectively connected with the second end of the resistor R31 and the first end of the resistor R33;

a first end of the resistor R31 is grounded; the second end of the resistor R33 is respectively connected with one pin of the operational amplifier U2 and the first end of the resistor R32;

the four pins of the operational amplifier U2 are connected with a power supply; five feet of the operational amplifier U2 are grounded;

the temperature measurement circuit includes: the temperature sensing element U8, the resistor R8, the resistor R9 and the capacitor C2;

the first end of the resistor R8 is connected with a power supply, and the second end of the resistor R8 is connected with the first end of the temperature sensing element U8;

a second end of the temperature sensing element U8 is respectively connected with a first end of a resistor R9 and a first end of a capacitor C2;

the second end of the resistor R9 and the second end of the capacitor C2 are respectively grounded;

the excitation light source circuit includes: the LED comprises a resistor R15, a resistor R16, a resistor R17, a resistor R18, a field effect transistor Q1 and a light emitting diode D2;

the first end of the resistor R17 and the first end of the resistor R18 are respectively connected with a power supply;

the second end of the resistor R17 and the second end of the resistor R18 are respectively connected with the anode of the light-emitting diode D2;

the cathode of the light-emitting diode D2 is connected with the D pole of the field-effect transistor Q1 through a resistor R15;

the G pole of the field effect transistor Q1 is connected with the control input end of the exciting light source circuit through a resistor R16;

the S pole of the field effect transistor Q1 is grounded;

the negative voltage circuit includes: a CE7660 chip, a capacitor C11, a capacitor C12, a capacitor C13 and a resistor R8;

the two pins of the CE7660 chip are grounded through a capacitor C11;

the three pins and the four pins of the CE7660 chip are grounded; the eight pins are connected with a positive power supply, the five pins are output pins, and the five pins are respectively connected with the first end of a capacitor C12, the first end of a capacitor C13 and the output end of a negative voltage circuit through a resistor R8;

the second end of the capacitor C12 and the second end of the capacitor C13 are grounded respectively;

the range switching circuit adopts CD4052 BCM.

5. A turbidity measuring instrument according to claim 1,

the high pass filter clamp circuit includes: the circuit comprises a resistor R11, a resistor R12, a resistor R13, a resistor R10 and a capacitor C3;

the first end of the capacitor C3 is connected with the input end of the high-pass filtering clamping circuit;

a second end of the capacitor C3 is respectively connected with a first end of the resistor R10 and a first end of the resistor R12;

the second end of the resistor R10 and the first end of the resistor R11 are respectively grounded;

the second end of the resistor R12, the second end of the resistor R12 and the first end of the resistor R13 are respectively connected with the output end of the high-pass filtering clamping circuit;

the second end of the resistor R13 is connected with the power supply;

the active detection circuit includes: a resistor R1, a resistor R2, a resistor R3, a resistor R4, a diode D3, a diode D4 and an operational amplifier U3;

the first end of the resistor R1 is connected with the input end of the active detection circuit; the second end of the resistor R1 is respectively connected with the first end of the resistor R2 and the three pins of the operational amplifier U3; two pins of the operational amplifier U3 are grounded through a resistor R3;

five pins of the operational amplifier U3 are connected with the anode of a diode D3; the cathode of the diode D3 is respectively connected with the second end of the resistor R2 and the first end of the resistor R4;

the second end of the resistor R4 is respectively connected with the output end of the active detection circuit and the anode of the diode D4;

the cathode of the diode D4 is connected with the power supply.

6. A turbidity measuring instrument according to claim 1,

the first end of the shell (1) is provided with at least two thread sections (63);

each thread section is arranged according to different thread standards, and a distance is configured between the thread sections.

7. A turbidity measuring instrument according to claim 3,

one end of the supporting piece (52) is connected with the external thread seat (51); the supporting piece (52) is provided with a supporting surface, and two fixing holes (11) are arranged on the supporting surface;

the circuit module (2) is arranged on the supporting surface of the supporting piece (52) and fixedly connected through the fixing hole (11).

Images