CN211086082U - Turbidity measuring device - Google Patents
Turbidity measuring device Download PDFInfo
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- CN211086082U CN211086082U CN201921690952.5U CN201921690952U CN211086082U CN 211086082 U CN211086082 U CN 211086082U CN 201921690952 U CN201921690952 U CN 201921690952U CN 211086082 U CN211086082 U CN 211086082U
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Abstract
The utility model discloses a turbidity measuring device, a light source part is used for emitting light, a first light filtering part is used for allowing the light source part to emit light with preset wave band to pass through and blocking light with other wave bands, and a first light guiding part is used for emitting the light passing through the first light filtering part from a first diaphragm at a first preset angle so as to project to a sample to be measured; the second light guide part is used for guiding and transmitting light reflected by the tested sample and entering the second diaphragm at a second preset angle to the second light filtering part, the second light filtering part is used for allowing light in a preset wave band to pass and blocking light in other wave bands, and the photoelectric sensing part is used for receiving the light passing through the second light filtering part and converting the light into an electric signal. The utility model discloses set up light filtering part among the turbidity measuring device and allow to pass through predetermined wave band light and block the parasitic light of other wave bands to get rid of stray light through the diaphragm, consequently compare with current turbidity measuring device, can reduce stray light, improve the SNR, optimize turbidity measuring device performance.
Description
Technical Field
The utility model relates to a turbidity optical measurement technical field especially relates to a turbidity measuring device.
Background
Currently, the turbidity of water becomes an increasingly important index, and with the emphasis of the country on ecological environment protection, the turbidity of water is required to be detected to be lower and lower, which makes higher requirements on the performance of a measuring instrument. Although the existing water body turbidity measuring device is simple in light path structure and low in cost, the stray light problem is serious, the signal to noise ratio of an optical signal is low, and the development of the turbidity measuring device to a lower measurement limit is hindered.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a turbidity measuring device compares with prior art and can reduce stray light, improves the SNR, optimizes turbidity measuring device performance.
In order to achieve the above object, the present invention provides a turbidity measuring device, including a light source, a first light-filtering part, a first light-guiding part, a first diaphragm, a second light-guiding part, a second light-filtering part and a photoelectric sensing part;
the light source part is used for emitting light, the first light filtering part is used for allowing light in a preset wave band emitted by the light source part to pass and blocking light in other wave bands, and the first light guiding part is used for emitting the light passing through the first light filtering part from the first diaphragm at a first preset angle so as to project to a tested sample;
the second light guide part is used for guiding and transmitting light reflected by a tested sample and entering the second diaphragm at a second preset angle to the second light filtering part, the second light filtering part is used for allowing light in a preset wave band to pass through and blocking light in other wave bands, and the photoelectric sensing part is used for receiving the light passing through the second light filtering part and converting the light into an electric signal.
Preferably, the optical filter further comprises a first collimating part disposed on an optical path between the light source part and the first filter part, wherein the first collimating part is configured to collimate light emitted from the light source part;
and/or the photoelectric sensing part is arranged on the optical path between the first light filtering part and the photoelectric sensing part, and the first collimating part is used for collimating the light passing through the first light filtering part.
Preferably, the first light guide part includes a plurality of reflective elements, and light passing through the first light filter part is reflected by each reflective element in sequence and then emitted from the first diaphragm at a first preset angle;
and the second light guide part comprises a plurality of reflecting elements, and the light reflected by the tested sample and entering the second diaphragm is reflected by each reflecting element in sequence and then enters the second light filtering part.
Preferably, the first light guide part includes two reflective members, and the second light guide part includes two reflective members.
Preferably, the reflective element comprises an optical element coated with a reflection enhancing film.
Preferably, the first light guide part includes an optical fiber, or/and the second light guide part includes an optical fiber.
Preferably, the device further comprises a protective lens arranged on one side of the first diaphragm facing the measured sample and used for blocking the measured sample from entering the first diaphragm, or/and a protective lens arranged on one side of the second diaphragm facing the measured sample and used for blocking the measured sample from entering the second diaphragm.
Preferably, the angle between the light emitted by the first diaphragm and the light reflected by the sample to be measured and entering the second diaphragm is 90 +/-2.5 degrees, 0 +/-2.5 degrees or 180 +/-2.5 degrees.
According to the above technical solution, the utility model provides a turbidity measuring device, light source portion sends out light, and first light filtering portion predetermines the wave band light in light source portion sends out light and passes through and block other wave band light, and first leaded light portion will launch from first diaphragm through the light of first light filtering portion with first predetermined angle, and project to the sample that is surveyed; the second light guide part guides and transmits light reflected by the tested sample and entering the second diaphragm at a second preset angle to the second light filtering part, the second light filtering part allows light in a preset waveband to block light in other wavebands, and the photoelectric sensing part receives the light passing through the second light filtering part and converts the light into an electric signal so as to calculate and obtain the turbidity of the tested sample according to the electric signal.
The utility model discloses set up light filtering part among the turbidity measuring device and allow to pass through predetermined wave band light and block the parasitic light of other wave bands to get rid of stray light through the diaphragm, consequently compare with current turbidity measuring device, can reduce stray light, improve the SNR, optimize turbidity measuring device performance.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view of a turbidity measuring apparatus according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a turbidity measuring apparatus according to another embodiment of the present invention.
Detailed Description
In order to make the technical solutions in the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
An embodiment of the utility model provides a turbidity measuring device, lead optical part, second optical part and photoelectric sensing portion including light source portion, first optical part, first light guide, first diaphragm, second light guide.
The light source part is used for emitting light, the first light filtering part is used for allowing light in a preset wave band emitted by the light source part to pass through and blocking light in other wave bands, and the first light guiding part is used for emitting the light passing through the first light filtering part from the first diaphragm at a first preset angle so as to project the light to a tested sample.
The second light guide part is used for guiding and transmitting light reflected by a tested sample and entering the second diaphragm at a second preset angle to the second light filtering part, the second light filtering part is used for allowing light in a preset wave band to pass through and blocking light in other wave bands, and the photoelectric sensing part is used for receiving the light passing through the second light filtering part and converting the light into an electric signal.
The first and second filters allow light of a predetermined wavelength band to pass therethrough, which is used for measuring turbidity by being projected onto a sample to be measured. The light is emitted from the first diaphragm at a first preset angle, which means that the included angle between the light and the normal of the plane where the diaphragm is located is a first preset angle. The light enters the second diaphragm at a second preset angle, which means that the included angle between the light and the normal of the plane where the second diaphragm is located is the second preset angle.
In the turbidity measuring device, the light source part emits light, the first light filtering part passes light in a preset waveband in the light emitted by the light source part and blocks light in other wavebands, and the first light guiding part emits the light passing through the first light filtering part from the first diaphragm at a first preset angle and projects the light to a sample to be measured; the second light guide part guides and transmits light reflected by the tested sample and entering the second diaphragm at a second preset angle to the second light filtering part, the second light filtering part allows light in a preset waveband to block light in other wavebands, and the photoelectric sensing part receives the light passing through the second light filtering part and converts the light into an electric signal so as to calculate and obtain the turbidity of the tested sample according to the electric signal.
The turbidity measuring device is provided with the optical filter part to allow the light with the preset waveband to pass and block the stray light with other wavebands, and the stray light is eliminated through the diaphragm, so that compared with the existing turbidity measuring device, the turbidity measuring device can reduce the stray light, improve the signal-to-noise ratio and optimize the performance of the turbidity measuring device.
The turbidity measuring apparatus according to the present embodiment will be described in detail with reference to the accompanying drawings and the following detailed description. Referring to fig. 1, fig. 1 is a schematic view of a turbidity measuring apparatus according to the present embodiment, and as can be seen from the figure, the turbidity measuring apparatus includes a light source 10, a first optical filter 11, a first light guide 12, a first stop 13, a second stop 14, a second light guide 15, a second optical filter 16, and a photoelectric sensor 17.
The light source 10 is used to emit light, the light source 10 is preferably a point light source, optionally, the light source 10 may be L ED, but is not limited thereto, and may also be other light sources, which are also within the protection scope of the present invention.
The first filter portion 11 is used for allowing the light of the preset wavelength band in the light emitted from the light source portion 10 to pass through and blocking the light of other wavelength bands, and filtering out the stray light based on the filtering effect of the first filter portion. The first optical filter portion 11 may be an optical filter, or may be another optical filter element, and is also within the protection scope of the present invention.
In a preferred embodiment, referring to fig. 2, a first collimating unit 18 may be disposed on the optical path between the light source unit 10 and the first filter unit 11, the first collimating unit 18 may be configured to collimate the light emitted from the light source unit 10, and the light emitted from the light source unit 10 may be collimated into parallel light by the first collimating unit 18. In a specific implementation, the first collimating part may include an optical element such as a convex lens, a concave lens, and the like.
The first light guide part 12 is used for emitting the light passing through the first light filter part 11 from the first diaphragm 13 at a first preset angle so as to project the light to the sample 21 to be detected, and the first light guide part 12 plays a role in guiding the light propagation direction and can reduce light energy loss. The first diaphragm 13 plays a role of removing stray light. In a specific implementation, the first light guide part 12 may be an optical fiber, and the light transmission is guided by the optical fiber. Alternatively, the first light guide part 12 may include a plurality of reflective elements, and the light passing through the first light filter part 11 is reflected by the reflective elements in sequence and then emitted from the first diaphragm 13 at a first preset angle. Preferably, the reflecting element can be an optical element coated with a reflection increasing film, so that the reflecting element has higher reflectivity and the attenuation of light energy in the transmission process is reduced.
The second light guide part 15 is used for guiding and transmitting the light reflected by the tested sample 21 and entering the second diaphragm 14 at a second preset angle to the second light-filtering part 16. The light emitted by the first diaphragm 13 is projected to the sample to be measured, and is scattered or reflected by the sample to be measured, the light returned by the sample to be measured 21 enters the second diaphragm 14, the light entering the second diaphragm 14 at the second preset angle is guided by the second light guide part 15 to be transmitted to the second light filter part 16, the second diaphragm 14 plays a role in eliminating stray light, and the second light filter part 16 plays a role in guiding the light transmission direction, so that the light energy loss can be reduced. In a specific implementation, an optical fiber may be used as the second light guide portion 15. Alternatively, the second light guide 15 may include a plurality of reflective elements, and the light reflected by the sample to be measured and entering the second stop 14 is reflected by each reflective element in sequence and then enters the second light filter 16. Preferably, the reflecting element can be an optical element coated with a reflection increasing film, so that the reflecting element has higher reflectivity and the attenuation of light energy in the transmission process is reduced.
The second filter portion 16 serves to allow light of a preset wavelength band to pass therethrough and block light of other wavelength bands. Stray light in the return light is filtered out based on the filtering action of the second light-filtering portion. The second optical filter portion 16 may be an optical filter, or may be other optical filter elements, and is also within the protection scope of the present invention.
The photoelectric sensing portion 17 is used for receiving the light passing through the second optical filter portion 16 and converting the light into an electrical signal, so as to further obtain a turbidity result of the sample to be tested through calculation according to the collected electrical signal.
In a preferred embodiment, referring to fig. 2, the turbidity measuring apparatus further includes a second collimating part 19 disposed on an optical path between the second optical filter part 16 and the photoelectric sensing part 17, and the second collimating part 19 collimates light passing through the second optical filter part 16. The light passing through the second filter portion is collimated into parallel light by the second collimating portion 19 and projected to the photoelectric sensing portion 17. In a specific implementation, the second collimating part may include optical elements such as convex lenses, concave lenses, and the like.
Optionally, the angle between the light emitted from the first diaphragm 13 and the light reflected from the sample to be measured and entering the second diaphragm 14 is 90 ± 2.5 degrees, 0 ± 2.5 degrees or 180 ± 2.5 degrees. According to the international and industrial standard requirements of the turbidity detection field, the included angle between the light projected by the turbidity measuring device to the measured sample and the light returned by the measured sample to the turbidity measuring device is 90 degrees, 0 degree or 180 degrees, so that the turbidity measuring device of the embodiment can meet the international and industrial standard requirements of the turbidity detection field. But not limited thereto, in practical applications, the included angle between the light emitted from the first diaphragm 13 and the light reflected from the sample to be measured and entering the second diaphragm 14 may be other angle values, and the present invention is also within the protection scope of the present invention.
For example, referring to fig. 2, in one embodiment, an angle between the light emitted from the first stop 13 and the light reflected by the sample to be measured and entering the second stop 14 is 90 degrees, wherein the first light guide portion 12 includes a reflective element 120 and a reflective element 121, so that the first predetermined angle is 45 degrees, and the second light guide portion 15 includes a reflective element 150 and a reflective element 151, so that the second predetermined angle is 45 degrees.
Further preferably, referring to fig. 1 or fig. 2, the turbidity measuring apparatus of this embodiment further includes a protective lens 20 disposed on a side of the first diaphragm 13 facing the sample to be measured and used for blocking the sample to be measured from entering the first diaphragm 13, or/and further includes a protective lens 20 disposed on a side of the second diaphragm facing the sample to be measured and used for blocking the sample to be measured from entering the second diaphragm. Preferably, the protective lens can be a sapphire glass lens, the end face of the reflecting element or the optical fiber directly contacts with the liquid to be detected, and due to the fact that sand and small stones possibly exist in the liquid, a plurality of fine scratches can be caused on the end face after a long time, so that transmission of optical signals is influenced, the sapphire glass lens is high in hardness, and the optical element or the optical fiber can be well protected.
The above is to the detailed description of the turbidity measuring device provided by the present invention. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.
Claims (8)
1. A turbidity measuring device is characterized by comprising a light source part, a first light filtering part, a first light guiding part, a first diaphragm, a second light guiding part, a second light filtering part and a photoelectric sensing part;
the light source part is used for emitting light, the first light filtering part is used for allowing light in a preset wave band emitted by the light source part to pass and blocking light in other wave bands, and the first light guiding part is used for emitting the light passing through the first light filtering part from the first diaphragm at a first preset angle so as to project to a tested sample;
the second light guide part is used for guiding and transmitting light reflected by a tested sample and entering the second diaphragm at a second preset angle to the second light filtering part, the second light filtering part is used for allowing light in a preset wave band to pass through and blocking light in other wave bands, and the photoelectric sensing part is used for receiving the light passing through the second light filtering part and converting the light into an electric signal.
2. A turbidity measuring apparatus according to claim 1, further comprising a first collimating section provided on an optical path between said light source section and said first filter section, said first collimating section being configured to collimate the light emitted from said light source section;
and/or the photoelectric sensing part is arranged on the optical path between the first light filtering part and the photoelectric sensing part, and the first collimating part is used for collimating the light passing through the first light filtering part.
3. A turbidity measuring apparatus according to claim 1, wherein said first light guide portion comprises a plurality of reflective elements, and light passing through said first light filter portion is reflected by each reflective element in sequence and then emitted from said first diaphragm at a first predetermined angle;
and the second light guide part comprises a plurality of reflecting elements, and the light reflected by the tested sample and entering the second diaphragm is reflected by each reflecting element in sequence and then enters the second light filtering part.
4. A turbidity measuring device according to claim 3, wherein said first light guiding portion comprises two reflective elements and said second light guiding portion comprises two reflective elements.
5. A turbidity measuring apparatus according to claim 3, wherein said reflective element comprises an optical element coated with a reflection enhancing film.
6. A turbidity measuring device according to claim 1, wherein said first light guiding part comprises an optical fiber, or/and said second light guiding part comprises an optical fiber.
7. A turbidity measuring apparatus according to any one of claims 1-6, further comprising a protective lens disposed on a side of said first diaphragm facing the sample to be measured for blocking the sample to be measured from entering said first diaphragm, or/and further comprising a protective lens disposed on a side of said second diaphragm facing the sample to be measured for blocking the sample to be measured from entering said second diaphragm.
8. A turbidity measuring apparatus according to claim 1, wherein the light emitted by said first aperture is at an angle of 90 ± 2.5 degrees, 0 ± 2.5 degrees or 180 ± 2.5 degrees to the light reflected back from the sample being measured into said second aperture.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921690952.5U CN211086082U (en) | 2019-10-10 | 2019-10-10 | Turbidity measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921690952.5U CN211086082U (en) | 2019-10-10 | 2019-10-10 | Turbidity measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211086082U true CN211086082U (en) | 2020-07-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921690952.5U Active CN211086082U (en) | 2019-10-10 | 2019-10-10 | Turbidity measuring device |
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| CN (1) | CN211086082U (en) |
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- 2019-10-10 CN CN201921690952.5U patent/CN211086082U/en active Active
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