A scattering turbidity sensor and a production method thereof

Abstract

The present invention relates to the technical field of water quality turbidity detection, and solves the problem of refraction of detection light when incident on a light-transmitting member in the prior art. A scattering turbidity sensor comprises a probe seat and a cylinder body, wherein a detection light emitting channel and a detection light receiving channel are provided on the probe seat, a detection light emitting unit is provided in the detection light emitting channel, a detection light receiving unit is provided in the detection light receiving channel, a circuit is provided in the cylinder body, the detection light emitting unit and the detection light receiving unit are respectively connected to the circuit, the cylinder body is detachably connected to the probe seat, and a seal formed by a waterproof light-transmitting glue is provided in the detection light emitting channel and the detection light receiving channel. The seal is formed by the waterproof light-transmitting glue, and an incident surface perpendicular to the optical axis of the detection light emitting unit / detection light receiving unit can be formed by adjusting the angle of the probe seat, thereby avoiding the detection light from being refracted at the interface between the air and the seal when it is incident on the seal, causing inaccurate measurement.

Description

Technical Field

[0001] The invention relates to the technical field of water turbidity detection, and in particular to a scattering turbidity sensor and a production method thereof. Background Art

[0002] The turbidity of water refers to the degree of obstruction caused by the solution to the passage of light. In addition to being related to the amount of suspended particles in the liquid, turbidity is also related to the shape, surface reflectivity and size of the particles. The turbidity of water is caused by suspended matter such as clay, tiny inorganic matter, organic matter, plankton and other microorganisms. The turbidity of water can be measured by transmission method, scattering method and scattering-transmission ratio method. The scattered light measurement method has good sensitivity and measurement accuracy when measuring low turbidity, and the scattered light intensity at this time maintains good linearity with the solution concentration. The scattered light intensity is linearly related to the concentration of the solution, and data processing is simple. Existing research results show that measuring scattered light at a 90° angle is least affected by changes in particle size, and the received stray light is also the smallest. The scattered turbidity sensor has a detection light emitting unit and a detection light receiving unit. In order to ensure the cleanliness of the two, a light-transmitting component is often used to seal them in the probe seat. However, the connection between the light-transmitting component and the probe seat is achieved by waterproof glue. During the process of adding the waterproof glue, the orientation of the light-transmitting component cannot be guaranteed, resulting in refraction of the detection light when it is incident on the light-transmitting component, causing the actual scattering angle of the detection light in the liquid to be tested to be not 90°, resulting in inaccurate detection. Summary of the invention

[0003] The invention provides a scattering turbidity sensor and a production method thereof, which solves the problem in the prior art that detection light is refracted when incident on a light-transmitting member.

[0004] A scattering turbidity sensor comprises a probe seat and a cylinder body. The probe seat is provided with a detection light emitting channel and a detection light receiving channel. The detection light emitting channel is provided with a detection light emitting unit. The detection light receiving channel is provided with a detection light receiving unit. A circuit is provided in the cylinder body. The detection light emitting unit and the detection light receiving unit are respectively connected to the circuit. The cylinder body is detachably connected to the probe seat. The detection light emitting channel and the detection light receiving channel are both provided with a seal formed by a waterproof and light-transmitting adhesive. When the present invention is used, the detection light is refracted at the interface between the seal and the liquid to be measured. The angle between the refracted detection light and the optical axis of the detection light receiving unit is 90 degrees, so that the measurement of 90° scattered light is achieved, and the influence of the change of particle size is minimized, and the received stray light is also minimized. The seal is formed by the waterproof and light-transmitting adhesive, and an incident surface perpendicular to the optical axis of the detection light emitting unit / detection light receiving unit can be formed by adjusting the angle of the probe seat, so that the detection light is prevented from being refracted at the interface between the air and the seal when it enters the seal, resulting in the detection light in the water body to be measured The angle between the optical axis of the detection light and the detection light receiving unit is not 90 degrees, resulting in inaccurate measurement.

[0005] Furthermore, the probe seat is provided with a temperature measurement channel, in which a metal cylinder is provided, the metal cylinder passes through the probe seat, and one end of the metal cylinder outside the space surrounded by the probe seat and the cylinder is closed, and a temperature sensor is provided in the metal cylinder, and the temperature sensor is connected to the circuit. The thin-walled metal cylinder has a small heat capacity, and its temperature can change rapidly to be consistent with the temperature of the water body to be measured. The temperature sensor in the metal cylinder is fixed by glue, and can detect the temperature of the metal cylinder, that is, the temperature of the water body to be measured, and perform temperature compensation on the turbidity detection structure.

[0006] Furthermore, a waterproof glue is provided at the gap between the metal tube and the probe seat, thereby improving the waterproof performance of the present invention.

[0007] Furthermore, the detection light emitting channel and the detection light receiving channel are both variable diameter holes, the inner diameter of the end of the detection light emitting channel away from the cylinder is smaller than the inner diameter of the other end, and the inner diameter of the end of the detection light receiving channel away from the cylinder is smaller than the inner diameter of the other end.

[0008] Furthermore, one end of the seal is located in the portion with a smaller inner diameter of the detection light emitting channel / detection light receiving channel, and the other end is located in the portion with a larger inner diameter of the detection light emitting channel / detection light receiving channel. The waterproof and light-transmitting glue forming the seal is usually UV-curing glue or epoxy resin glue. These two types of glues have a large surface tension and are prone to forming an arc surface in a channel with a small inner diameter. The location of one end of the seal in the portion with a larger inner diameter of the detection light emitting channel / detection light receiving channel is conducive to the waterproof and light-transmitting glue forming a flat surface. The detection light is incident perpendicular to the surface to avoid refraction on the surface.

[0009] Furthermore, the circuit is arranged on the control circuit board, the probe seat is integrally formed with a mounting seat, the control circuit board is fixedly connected to the mounting seat, and the mounting seat has an arc-shaped side surface and a plane side surface, and the plane side surface is used to fix the circuit board.

[0010] The production method of the scattering turbidity sensor comprises the following steps:

[0011] Step 1: fix a blocking piece on the end surface of the probe base away from the cylinder; the blocking piece blocks the detection light emission channel and the detection light receiving channel;

[0012] Step 2: Place the probe seat on the supporting fixture, make the axis of the detection light emission channel vertical, and inject waterproof and light-transmitting glue into the detection light emission channel; the waterproof and light-transmitting glue is blocked by the baffle, and a flat end face is formed after the baffle is removed;

[0013] Step three, place the probe seat on the supporting tooling, make the axis of the detection light receiving channel vertical, inject waterproof and light-transmitting glue into the detection light receiving channel, the waterproof and light-transmitting glue is blocked by the baffle, and a flat end face is formed after removing the baffle.

[0014] Further, the method further comprises the following steps:

[0015] Step 4: Fix the control circuit board to the mounting base;

[0016] Step 5: Install the probe base onto the cylinder.

[0017] Furthermore, the support fixture includes a base plate, a support block and a baffle, the support block is in the shape of a triangular prism, the baffle is fixedly connected to the support block, the support block is fixedly connected to the base plate, a universal level bubble is provided on the base plate, and three leveling bolts are evenly distributed around the circumference of the base plate. One side surface of the support block (the side surface of the triangular prism) is against the top surface of the base plate, and when the universal level bubble on the base plate is horizontal, the side surface of the support block is also horizontal, which can ensure that the upper surface of the seal is perpendicular to the detection light emitting channel / detection light receiving channel.

[0018] It can be seen from the above technical solutions that the present invention has the following advantages:

[0019] The seal is formed by waterproof and light-transmitting glue, and the angle of the probe seat can be adjusted to form an incident surface perpendicular to the optical axis of the detection light emitting unit / detection light receiving unit, thereby avoiding refraction of the detection light at the interface between the air and the seal when the detection light enters the seal, resulting in the angle between the optical axis of the detection light and the detection light receiving unit in the water body to be tested not being 90 degrees, causing inaccurate measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 Schematic diagram of the overall structure of the present invention;

[0022] Figure 2 A schematic diagram of the structure of the probe base of the present invention;

[0023] Figure 3 A front view of the probe base of the present invention;

[0024] Figure 4 for Figure 3 Sectional view at AA;

[0025] Figure 5 A schematic diagram of the supporting tooling structure of the present invention;

[0026] 1. Probe seat, 2. Cylinder, 3. Detection light emitting channel, 4. Detection light receiving channel, 5. Leveling bolt, 6. Metal cylinder, 7. Mounting seat, 8. Bottom plate, 9. Support block, 10. Baffle, 11. Angle limit plate, 12. Universal level bubble. DETAILED DESCRIPTION

[0027] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the present invention are described clearly and completely in conjunction with the accompanying drawings. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of them. Based on the embodiments in this patent, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this patent.

[0028] Example 1

[0029] like Figure 1-4As shown, a scattering turbidity sensor includes a probe seat 1 and a barrel 2. The probe seat 1 is provided with a detection light emitting channel 3 and a detection light receiving channel 4. The detection light emitting channel 3 is provided with a detection light emitting unit, and the detection light receiving channel 4 is provided with a detection light receiving unit. The barrel 2 is provided with a circuit, and the detection light emitting unit and the detection light receiving unit are respectively connected to the circuit. The barrel 2 is detachably connected to the probe seat 1. The detection light emitting channel 3 and the detection light receiving channel 4 are both provided with a seal formed by a waterproof and light-transmitting glue. When the present invention is used, the detection light is refracted at the interface between the seal and the liquid to be tested, and the angle between the refracted detection light and the optical axis of the detection light receiving unit is 90 degrees, so that the measurement of 90° scattered light is realized, and the influence of the change of particle size is minimized, and the received stray light is also minimized. The seal is formed by waterproof and light-transmitting glue, and the angle of the probe seat 1 can be adjusted to form an incident surface perpendicular to the optical axis of the detection light emitting unit / detection light receiving unit, thereby avoiding the detection light from being refracted at the interface between the air and the seal when it enters the seal, resulting in the detection light in the water body to be measured and the optical axis angle of the detection light receiving unit being not 90 degrees, resulting in inaccurate measurement. The probe seat 1 is provided with a temperature measurement channel, and a metal cylinder 6 is provided in the temperature measurement channel. The metal cylinder 6 passes through the probe seat 1, and one end thereof is closed outside the space surrounded by the probe seat 1 and the cylinder body 2. A temperature sensor is provided in the metal cylinder 6, and the temperature sensor is connected to the circuit. The thin-walled metal cylinder 6 has a small heat capacity, and its temperature can change rapidly to be consistent with the temperature of the water body to be measured. The temperature sensor in the metal cylinder 6 is fixed by glue, and can detect the temperature of the metal cylinder 6, that is, the temperature of the water body to be measured, and perform temperature compensation on the turbidity detection structure. A waterproof glue is provided in the gap between the metal cylinder 6 and the probe seat 1. The waterproof performance of the present invention is improved. The detection light emitting channel 3 and the detection light receiving channel 4 are both variable diameter holes. The inner diameter of one end of the detection light emitting channel 3 away from the cylinder 2 is smaller than the inner diameter of the other end, and the inner diameter of one end of the detection light receiving channel 4 away from the cylinder 2 is smaller than the inner diameter of the other end. One end of the seal is located in the part with a smaller inner diameter of the detection light emitting channel 3 / detection light receiving channel 4, and the other end is located in the part with a larger inner diameter of the detection light emitting channel 3 / detection light receiving channel 4. The waterproof and light-transmitting glue forming the seal is usually ultraviolet curing glue or epoxy resin glue. The surface tension of these two glues is large, and it is easy to form an arc surface in the channel with a smaller inner diameter. One end of the seal is located in the part with a larger inner diameter of the detection light emitting channel 3 / detection light receiving channel 4, which is conducive to the waterproof and light-transmitting glue forming a flat surface. The detection light is incident perpendicular to the surface to avoid refraction on the surface. The circuit is set on the control circuit board, and the probe seat 1 is integrally formed with a mounting seat 7, and the control circuit board is fixedly connected to the mounting seat 7. The mounting seat 7 has an arc-shaped side and a plane side, and the plane side is used to fix the circuit board.

[0030] Example 2

[0031] like Figure 5 As shown, the production method of the scattering turbidity sensor includes the following steps:

[0032] Step 1: fix a blocking piece on the end surface of the probe base 1 away from the cylinder 2; the blocking piece blocks the detection light emitting channel 3 and the detection light receiving channel 4;

[0033] Step 2: Place the probe seat 1 on the supporting tooling, make the axis of the detection light emission channel 3 vertical, and inject waterproof and light-transmitting glue into the detection light emission channel 3; the waterproof and light-transmitting glue is blocked by the baffle plate, and a flat end face is formed after the baffle plate 10 is removed;

[0034] Step 3: Place the probe seat 1 on the supporting tooling, make the axis of the detection light receiving channel 4 vertical, inject waterproof and light-transmitting glue into the detection light receiving channel 4, the waterproof and light-transmitting glue is blocked by the baffle, and the plane end face is formed after the baffle 10 is removed. The following steps are also included:

[0035] Step 4, fix the control circuit board to the mounting base 7;

[0036] Step 5: Install the probe base 1 onto the cylinder 2.

[0037] The supporting fixture includes a base plate 8, a supporting block 9 and a baffle 10. The supporting block 9 is in the shape of a triangular prism. The baffle 10 is fixedly connected to the supporting block 9. The supporting block 9 is fixedly connected to the base plate 8. A universal level bubble 12 is provided on the base plate 8. Three leveling bolts 5 are evenly distributed on the circumference of the base plate 8. One side surface of the supporting block 9 (the side surface of the triangular prism) is against the top surface of the base plate 8. When the universal level bubble 12 on the base plate 8 is horizontal, the side surface of the supporting block 9 is also horizontal, which can ensure that the upper surface of the seal is perpendicular to the detection light emitting channel 3 / detection light receiving channel 4.

[0038] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0039] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0040] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for producing a scattering turbidity sensor, characterized in that: The scattering turbidity sensor comprises a probe seat (1) and a cylinder (2); the probe seat (1) is provided with a detection light emitting channel (3) and a detection light receiving channel (4); a detection light emitting unit is provided in the detection light emitting channel (3); a detection light receiving unit is provided in the detection light receiving channel (4); a circuit is provided in the cylinder (2); the detection light emitting unit and the detection light receiving unit are respectively connected to the circuit; the cylinder (2) and the probe seat (1) are detachably connected; and the detection light emitting channel (3) and the detection light receiving channel (4) are both provided with a sealing member formed by a waterproof and light-transmitting adhesive; The probe seat (1) is provided with a temperature measurement channel, a metal tube (6) is provided in the temperature measurement channel, the metal tube (6) passes through the probe seat (1), one end of the metal tube (6) located outside the space enclosed by the probe seat (1) and the cylinder body (2) is closed, a temperature sensor is provided in the metal tube (6), and the temperature sensor is connected to the circuit; The detection light emitting channel (3) and the detection light receiving channel (4) are both variable diameter holes, the inner diameter of one end of the detection light emitting channel (3) away from the cylinder (2) is smaller than the inner diameter of the other end, and the inner diameter of one end of the detection light receiving channel (4) away from the cylinder (2) is smaller than the inner diameter of the other end. One end of the sealing member is located in a portion of the detection light emitting channel (3) / detection light receiving channel (4) with a smaller inner diameter, and the other end is located in a portion of the detection light emitting channel (3) / detection light receiving channel (4) with a larger inner diameter; Step 1: fixing a blocking piece on an end surface of the probe base (1) away from the cylinder (2); Step 2: Place the probe holder (1) on the support fixture. The supporting tooling comprises a base plate (8), a supporting block (9) and a baffle (10), wherein the supporting block (9) is in the shape of a triangular prism, the baffle (10) is fixedly connected to the supporting block (9), the supporting block (9) is fixedly connected to the base plate (8), a universal level bubble (12) is arranged on the base plate (8), and three leveling bolts (5) are evenly distributed on the circumference of the base plate (8). The axis of the detection light emission channel (3) is made vertical, and waterproof and light-transmitting glue is injected into the detection light emission channel (3); Step three, place the probe seat (1) on the supporting fixture, make the axis of the detection light receiving channel (4) vertical, and inject waterproof and light-transmitting glue into the detection light receiving channel (4).

2. The method for producing a scattering turbidity sensor according to claim 1, characterized in that: Waterproof glue is provided at the gap between the metal cylinder (6) and the probe seat (1).

3. The method for producing a scattering turbidity sensor according to claim 1, characterized in that: The circuit is arranged on a control circuit board, a mounting seat (7) is integrally formed on the probe seat (1), and the control circuit board is fixedly connected to the mounting seat (7).

4. The method for producing a scattering turbidity sensor according to claim 1, characterized in that: The following steps are also included: Step 4, fixing the control circuit board to the mounting base (7); Step 5: Install the probe base (1) onto the cylinder (2).

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