Water quality on-line long-optical-path measurement module

Abstract

The utility model relates to the technical field of water quality monitoring, in particular to a water quality on-line long-optical-path measuring module, which comprises a signal transceiving unit main body, an absorption cell and a reflector mounting seat which are arranged on the same axis, two light through holes are arranged inside the signal transceiving unit main body, and the two light through holes are respectively a receiving end and a transmitting end. The transmitting end is in a T shape, the receiving end is in a left-narrow and right-wide shape, a spectroscope is installed at the junction of an upper light through hole, a reference receiving module opposite to the spectroscope is installed in a vertical end, an optical transmitting module is installed at a port of a transverse end, and a detection receiving module and a collimating lens are installed in a narrow opening in a lower light through hole. A total reflection prism is mounted on the inner side of the reflector mounting seat, and a heating wire is wound on the outer side of the absorption cell. The water quality on-line long-optical-path measurement module is provided with the reference receiver, the influence of light source energy fluctuation on a test result does not need to be considered, the system has no optical fiber attenuation, and the signal is stronger.

Description

Technical Field

[0001] The utility model relates to the technical field of water quality monitoring, in particular to an on-line long optical path measurement module for water quality. Background Technique

[0002] At present, most of the measurement modules of on-line water quality monitors on the market are single optical path. The two sides of the absorption cell are directly connected to the optical fibers, and the optical fibers on both sides will be bent to varying degrees. The light emitted by the light source enters the absorption cell after being conducted by the optical fiber, and the light coming out of the absorption cell needs to be conducted by the optical fiber and then received by the detector. In the whole process, the light has varying degrees of attenuation. When measuring low-concentration water samples, the absorbance itself is very low. This situation leads to a large deviation between the measurement result and the actual concentration of the water sample when measuring low-concentration water samples, not meeting the measurement requirements.

[0003] Some instruments exclude interference by adding a comparison light beam or improve stability by using two optical path measurements. Such methods cannot fundamentally solve the problem of low absorbance at low concentrations; there are also instruments that achieve a long optical path by directly lengthening the absorption cell. This method has a large lateral volume and is not easy to maintain. Especially, it is very difficult to clean after the absorption cell is scaled and soiled. Content of the Utility Model

[0004] To achieve the above object, the utility model provides the following technical solution: an on-line long optical path measurement module for water quality, including a signal transceiver unit main body, an absorption cell, and a mirror mounting seat on the same axis. Two light passing holes are opened inside the signal transceiver unit main body, and the two light passing holes are respectively a receiving end and a transmitting end. The transmitting end is T-shaped, the receiving end is narrow on the left and wide on the right. A beam splitter is installed at the junction of the upper light passing hole, a reference receiving module opposite to the beam splitter is installed in the vertical end, and an optical emission module is installed at the port of the horizontal end. A detection receiving module and a collimating mirror are installed in the narrow opening of the lower light passing hole. A total reflection prism is installed inside the mirror mounting seat, and a heating wire is wound around the outside of the absorption cell.

[0005] Further, a groove is opened at the junction of the transmitting end of the signal transceiver unit main body, and the groove forms a 45° angle with the central axis of the T-shaped light passing hole. A plurality of convex blocks are fixed in the groove, and the beam splitter is inserted into the groove.

[0006] Further, the opening of the absorption cell is small at the lower side and large at the upper side, and two side ears are fixed at the same side of the outside.

[0007] Further, a plurality of wire winding columns are fixed on the outside of the absorption cell, and fixed columns distributed in a triangle are installed in the middle of the wire winding columns.

[0008] Further, a temperature sensor connected to one of the fixed columns is installed on one side of the absorption cell.

[0009] Furthermore, the center distance between the two light-passing holes of the signal transceiver unit body is 15 mm, where the width of the slit at the transmitting end is 2 mm, and the width of the light-passing hole at the receiving end is 8.2 mm.

[0010] Furthermore, the beam splitter has a transmittance to reflectance ratio of 5:5.

[0011] Furthermore, the total reflection prism is an isosceles right prism, and the length of the hypotenuse is 30 mm.

[0012] Furthermore, the opening of the mirror mount is 20 mm long and 5 mm wide.

[0013] Furthermore, the diameter of the collimating mirror is 8 mm and it is coaxial with the detection and receiving module.

[0014] Compared with the prior art, the technical solution of the present application has the following beneficial effects:

[0015] 1. For this on-line long optical path water quality measurement module, a reference receiver is designed, so there is no need to consider the influence of light source energy fluctuation on the test result. There is no fiber attenuation in the system and the signal is stronger;

[0016] 2. For this on-line long optical path water quality measurement module, the reference detector and the receiving detector are on the same side, which can reduce the influence of environmental condition changes on the test result;

[0017] 3. For this on-line long optical path water quality measurement module, the signal transceiver component is modularly designed, and the installation process is simple to operate, which can meet the maintenance requirements of the instrument;

[0018] 4. For this on-line long optical path water quality measurement module, with its long optical path design, the detection beam enters the absorption cell twice and is absorbed by the liquid to be measured twice, so the signal change is more obvious, the absorbance is higher, and the sensitivity is higher;

[0019] 5. For this on-line long optical path water quality measurement module, according to the modular design of functions, it saves the structural design space layout, and the whole machine is easy to install and maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of the present utility model;

[0021] Figure 2 It is a three-dimensional view of the absorption cell in the present utility model.

[0022] In the figure: 1. Reference receiving module; 2. Beam splitter; 3. Optical transmitting module; 4. Detection receiving module; 5. Collimating mirror; 6. Heating wire; 7. Total reflection prism; 8. Mirror mounting base; 9. Absorption cell; 10. Main body of signal transceiver unit; 11. Groove; 12. Bump; 13. Side ear; 14. Wire winding post; 15. Fixed post; 16. Temperature sensor. Specific embodiments

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0024] Please refer to Figure 1-2 , a water quality on-line long optical path measurement module in this embodiment includes a main body 10 of a signal transceiver unit, an absorption cell 9 and a mirror mounting base 8 on the same axis. Two light passing holes are opened inside the main body 10 of the signal transceiver unit. The upper light passing hole is the receiving end, and the lower light passing hole is the transmitting end. The transmitting end is T-shaped, and the receiving end is narrow on the left and wide on the right. A beam splitter 2 is installed at the junction of the receiving end, and a reference receiving module 1 vertically symmetric to the beam splitter 2 is installed in the vertical end. An optical transmitting module 3 is installed on the left side of the beam splitter 2 at the port of the horizontal end. A detection receiving module 4 and a collimating mirror 5 are installed in the narrow mouth of the transmitting end. A total reflection prism 7 is installed inside the mirror mounting base 8, and a heating wire 6 is wound around the outside of the absorption cell 9;

[0025] The center distance between the two light passing holes of the main body 10 of the signal transceiver unit is 15 mm, the slit width of the transmitting end is 2 mm, and the width of the light passing hole of the receiving end is 8.2 mm;

[0026] The opening of the mirror mounting base 8 is 20 mm long and 5 mm wide;

[0027] The optical transmitting module 3 and the detection receiving module 4 are installed on the same circuit board, and the reference receiving module 1 is installed on another circuit board. The circuit board is fixed to the main body 10 of the signal transceiver unit by screws.

[0028] In the above structure, the optical emission module emits a light beam, which is split into two beams by the beam splitter. One beam enters the reference receiving module and is converted into a corresponding reference electrical signal by the reference receiving module; the other beam passes through the slit and enters the absorption cell. After the light is absorbed by the liquid to be measured, it exits from the right side of the absorption cell, then enters the total reflection prism opposite, and the light entering the total reflection module is deflected by 180°. Then it enters the absorption cell again from the right side of the absorption cell, and the light is absorbed by the liquid to be measured for the second time, and then exits from the left side of the absorption cell and enters the receiving module. The light is collimated by the collimating mirror in the reference receiving module and then enters the detection receiving module, and is converted into a corresponding detection electrical signal by the detection receiving module. The absorption cell contains the liquid to be measured, and the heating wire wound around the wall of the absorption cell can heat the liquid. The mirror mounting seat mainly plays the role of fixing and adjusting the total reflection prism to ensure that the light can enter the detection module to the greatest extent and be received by the detection detector.

[0029] Among them, a groove 11 is formed at the junction of the emission end of the signal transceiver unit body 10, and the groove 11 forms a 45° angle with the central axis of the T-shaped light passing hole. A plurality of protrusions 12 are fixed in the groove 11, and the beam splitter 2 is inserted into the groove 11 and fixed by the protrusions 12. The beam splitter is directly inserted into the groove, and there are protrusions in the groove to ensure that the lens does not shake.

[0030] Among them, the beam splitter 2 has a transmittance-to-reflectance ratio of 5:5. Ensure that the incident light can be divided into a reference light beam and a detection light beam, and the zero energy value error between the reference light beam and the detection light beam does not exceed 2%. The cleanliness of the absorption cell of the instrument can be analyzed according to this parameter to guide the maintenance of the instrument.

[0031] Among them, the total reflection prism 7 is an isosceles right prism, and the hypotenuse is 30 mm. It can make the incident light exit after being deflected by 180°, and the exiting light enters the absorption cell again to achieve long optical path measurement.

[0032] Among them, the collimating mirror 5 has a diameter of 8 mm and is coaxial with the detection receiving module 4. It corrects the retroreflected light to ensure that the light can enter the detection receiving module to the greatest extent.

[0033] As Figure 2 In the direction shown, a plurality of wire winding posts 14 are fixed on both the left and right sides of the upper part and both the left and right sides of the lower part of the absorption cell 9. Two fixing posts are fixed between the wire winding posts 14 distributed up and down on the left side, and another fixing post 15 is fixed between the wire winding posts 14 distributed up and down on the right side, and the three fixing posts 15 are distributed in a triangle. The wire winding posts can guide the heating wire during winding to make the winding spacing equal. At the same time, the heating wire is straightened and wound along the fixing posts to ensure that the light passing part of the absorption cell is not blocked.

[0034] Among them, the opening of the absorption cell 9 is smaller at the lower side and larger at the upper side, and two side ears 13 are fixed on the right side. When the heating wire is wound around the outside of the absorption cell through the winding post, the head and tail sections of the heating wire are respectively wound around the side ears, and then pass through the holes of the side ears, so as to fix the heating wire through the side ears, so that the heating wire is closely attached to the outer wall of the absorption cell and will not be loosened. The opening of the absorption cell is smaller at the lower side and larger at the upper side, which is convenient for brushing.

[0035] In addition, a temperature sensor 16 is installed below the right fixed column 15 on the right side of the absorption cell 9, and the temperature sensor 16 is wound and fixed on the fixed column 15. The fixed column can improve the firmness of the installation of the temperature sensor, and at the same time the temperature sensor can detect the sample temperature in real time.

[0036] The working principle of the above embodiment is as follows:

[0037] The light beam emitted by the optical emission module is split into a reference beam and a detection beam by the beam splitter; the reference beam is directly incident on the reference receiving module to generate a corresponding reference electrical signal; the detection beam passes through the slit and then enters the absorption cell and is absorbed by the sample, and then exits the absorption cell, enters the total reflection prism on the opposite side, and is reflected by the total reflection prism, and the light is refracted by 180°, enters the absorption cell again and is absorbed by the liquid to be measured, and then exits the absorption cell, enters the collimating mirror for correction, and generates a corresponding detection signal through the detection receiving module; calculate the absorbance according to the Lambert-Beer law, and analyze the signal after zero-full point calibration; display the concentration of the liquid to be measured.

[0038] In summary, it can be realized that the light enters the absorption cell and is absorbed by the liquid to be measured, and then exits the absorption cell and enters the total reflection prism on the opposite side. The total reflection prism refracts the light by 180°, and then the light enters the absorption cell again and is secondarily absorbed by the liquid to be measured. The absorbance of the secondary absorption is higher, the signal change is more obvious, and the resolution is higher.

[0039] The entire work process is over, and the content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0040] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the element.

[0041] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A water quality online long optical path measurement module, characterized in that: The invention comprises a signal transceiver unit body (10), an absorption pool (9) and a reflector mounting seat (8) on the same axis. The signal transceiver unit body (10) is provided with two light-through holes inside, and the two light-through holes are a receiving end and a transmitting end respectively. The transmitting end is T-shaped, and the receiving end is narrow on the left and wide on the right. A beam splitter (2) is installed at the intersection of the upper light-through holes, and a reference receiving module (1) opposite to the beam splitter (2) is installed in the vertical end, and an optical transmitting module (3) is installed at the port of the lateral end. A detection receiving module (4) and a collimator (5) are installed in the narrow opening of the lower light-through hole. A total reflection prism (7) is installed on the inner side of the reflector mounting seat (8), and a heating wire (6) is wound around the outer side of the absorption pool (9).

2. The water quality online long optical path measurement module according to claim 1, characterized in that: A groove (11) is provided at the junction of the transmitting end of the signal transceiver unit body (10), and the groove (11) forms an angle of 45° with the central axis of the T-shaped light-through hole. A plurality of protrusions (12) are fixed in the groove (11), and the beam splitter (2) is inserted into the groove (11).

3. The water quality online long optical path measurement module according to claim 1, characterized in that: The opening of the absorption tank (9) is smaller at the lower side and larger at the upper side, and two side ears (13) are fixed on the same side of the outer side.

4. The water quality online long optical path measurement module according to claim 3, characterized in that: A plurality of winding poles (14) are fixed on the outside of the absorption tank (9), and fixing poles (15) distributed in a triangular shape are installed in the middle of the winding poles (14).

5. The water quality online long optical path measurement module according to claim 4, characterized in that: A temperature sensor (16) connected to one of the fixing columns (15) is installed on one side of the absorption tank (9).

6. The water quality online long optical path measurement module according to claim 1, characterized in that: The center distance between the two light-through holes of the signal transceiver unit body (10) is 15 mm, wherein the slit width at the transmitting end is 2 mm, and the light-through hole width at the receiving end is 8.2 mm.

7. The water quality online long optical path measurement module according to claim 1, characterized in that: The beam splitter (2) has a transmittance to reflectance ratio of 5:

5.

8. The water quality online long optical path measurement module according to claim 1, characterized in that: The total reflection prism (7) is an isosceles right-angle prism, and the length of the hypotenuse is 30 mm.

9. The water quality online long optical path measurement module according to claim 1, characterized in that: The opening of the reflector mounting seat (8) is 20 mm long and 5 mm wide.

10. The water quality online long optical path measurement module according to claim 1, characterized in that: The collimating mirror (5) has a diameter of 8 mm and is coaxial with the detection receiving module (4).

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