CN205139008U - Nephelometric light path structure of high precision measurement - Google Patents
Nephelometric light path structure of high precision measurement Download PDFInfo
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- CN205139008U CN205139008U CN201520738940.0U CN201520738940U CN205139008U CN 205139008 U CN205139008 U CN 205139008U CN 201520738940 U CN201520738940 U CN 201520738940U CN 205139008 U CN205139008 U CN 205139008U
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Abstract
The utility model belongs to the technical field of optics, a nephelometric light path structure of high precision measurement is provided, include: LED light source, plano -convex lens, sample cell, sample bottle, photosignal transmission receiving element, photosignal scattering receiving element. The light that the LED light source sent turns into the parallel light through plano -convex lens, the sample bottle of parallel light through filling with the liquid that awaits measuring, and photosignal transmission receiving element receives the transmitted light, and photosignal scattering receiving element receives the scattered light. Photosignal transmission receiving element and photosignal scattering receiving element influencing each other and miscellaneous astigmatic interference through special light path design, isolation, make each receiving element receive the most crude initial value just. The problem of the general precision of present homemade turbidity appearance not high is solved.
Description
Technical field
The utility model relates to a kind of light channel structure, more particularly a kind of light channel structure for high-acruracy survey liquid turbidity.
Background technology
Turbidity is one of parameter of reflection liquid physical behavior, with the size of the concentration of suspended substance in liquid, particle, shape, etc. relevant, such as, in the detection of water quality quality, turbidity is exactly a very important index.The discharge capacity of the water that China does not process every year is 2,000 hundred million tons, and these sewage cause 90% river course flowing through city and polluted, the lake eutrophication of 75%, and day by day serious.In this context, improve monitoring water environment level, greatly develop monitoring water environment instrument very urgent.
A branch of directional light is propagated in transparency liquid, if existed without any suspended particle in liquid, so light beam can not change direction when rectilinear propagation; If have suspended particle, light beam will the side's of change body (whether not transparent tube particle is) when running into particle.This just forms so-called scattered light.The scattering of particle the more (turbidity is higher) light is just more serious.Turbidity is called turbidimetric instrument to measure with a kind of.Nephelometer emits beam, and makes it through one section of sample, and from being 90 ° with incident light, how much light is detected by the particle institute scattering in water in direction, is calculated the turbidity of liquid according to Mie scattering theorem by the scattered light intensity received.
In traditional turbidimeter, the light channel structure of instrument is due to design defect, be subject to external stray light and diffuse transmission impact each other, cause the background light intensity received larger, the intensity gradient of different turbidity is less, thus making the measuring accuracy of instrument lower, the error of instrument at 5% of full scale value, can only cannot meet high-precision measurement requirement.
Utility model content
In order to solve the low problem of existing Instrument measuring precision, the utility model provides a kind of light channel structure measuring liquid turbidity, and described structure comprises: LED light source, plano-convex lens, sample cell, sample bottle, photosignal transmission receiving element, transmission light shield, photosignal scattering receiving element, scattering light shield;
LED light source and plano-convex lens are contained in the left side of sample cell by interface unit, and the sample bottle filling liquid to be measured is placed in sample cell;
Photosignal transmission receiving element, transmission light shield are contained in the right side of sample cell by screw;
Photosignal transmission receiving element becomes Plane Angle relation with main optical path, and transmission light shield is arranged on outside photosignal transmission receiving element, is blocked by photosignal transmission receiving element;
Photosignal scattering receiving element receives radiation direction and becomes space angle relation with main optical path, and scattering light shield is arranged on outside photosignal scattering receiving element, is blocked by photosignal scattering receiving element.
Wherein, LED light source unit: for providing 850nm monochromatic light; Plano-convex lens: incident light is converted into directional light; Sample bottle: deposit testing liquid; Sample cell: connect each subassembly; LED light source, plano-convex lens, sample cell, photosignal transmission receiving element central point form main optical path; Photosignal scattering receiving element: receiving scattered light, with main shaft light path at angle, avoid receiving element surface reflection to receive main optical path and transmission and impact; Photosignal transmission receiving element: receive transmitted light, with main shaft light path at angle, avoid receiving element surface reflection to receive main optical path and scattering and impact; Light-shield cover: do oxide treatments, for absorbing parasitic light.
During work, directional light is through liquid to be measured, and liquid to be measured can have certain absorption to light, meets baer's law.Granule simultaneously in liquid to be measured has certain scattering to light, meets Mie scattering theorem.
By photosignal transmission receiving element and main optical path at angle, the parasitic light that receiving element surface reflection is gone out and main optical path are kept apart, and the light-shield cover of oxidized blackout absorbs, thus can not produce interference to main optical path.
By photosignal scattering receiving element and main optical path at angle, the parasitic light that receiving element surface reflection is gone out and main optical path are kept apart, and the light-shield cover of oxidized blackout absorbs, thus can not produce interference to main optical path.
By such process, the stray light that receiving element itself can bring is stopped, draw high the scattered light intensity gradient between different liquids, thus improve the measuring accuracy of instrument.
The beneficial effects of the utility model are as follows: this light channel structure is used in the middle of turbidity analyser, instrument indication error be measured value ± 3%, considerably beyond the precision index of domestic same quasi-instrument ± 5% full scale value.
Accompanying drawing explanation
Fig. 1 is the vertical view of the light channel structure of the utility model high-acruracy survey turbidity.
Fig. 2 is the rear view of the light channel structure of the utility model high-acruracy survey turbidity.
Fig. 3 is the side view of the light channel structure of the utility model high-acruracy survey turbidity.
Reference numeral is as follows:
1, LED light source
2, plano-convex lens
3, sample cell
4, sample bottle
5, photosignal transmission receiving element
6, transmission light shield
7, photosignal scattering receiving element
8, scattering light shield
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in detail.
As shown in Figure 1, photosignal transmission receiving element 5 becomes 127 ° with main optical path, and the parasitic light that receiving element surface reflection is gone out shines directly on transmission light shield 6, and parasitic light directly absorbs by the transmission light shield through oxidizing blackening, further, transmission light shield completely cuts off external stray light impact.
As shown in Figure 2,3, photosignal scattering receiving element 7 is at 45 ° with main optical path, and the parasitic light that receiving element surface reflection is gone out shines directly on scattering light shield 8, and parasitic light directly absorbs by the transmission light shield through oxidizing blackening, further, transmission light shield completely cuts off external stray light impact.Meanwhile, become space angle relation with photosignal transmission receiving element, the light receiver between such photosignal transmission receiving element 5 and photosignal scattering receiving element 7 is completely independently opened, can not to impacting one another.
Obviously, those skilled in the art can carry out various change and modification to the utility model and not depart from spirit and scope of the present utility model.Like this, if belong within the scope of the utility model claim and equivalent technology thereof to these amendments of the present utility model and modification, then the utility model is also intended to comprise these change and modification.
Claims (1)
1. a light channel structure for high-acruracy survey turbidity, is characterized in that:
Described structure comprises: LED light source (1), plano-convex lens (2), sample cell (3), sample bottle (4), photosignal transmission receiving element (5), transmission light shield (6), photosignal scattering receiving element (7), scattering light shield (8);
LED light source (1) and plano-convex lens (2) are contained in the left side of sample cell (3) by interface unit, the sample bottle (4) filling liquid to be measured is placed in sample cell (3);
Photosignal transmission receiving element (5), transmission light shield (6) are contained in the right side of sample cell (3) by screw;
Photosignal transmission receiving element (5) becomes Plane Angle relation with main optical path, transmission light shield (6) is arranged on photosignal transmission receiving element (5) outside, is blocked by photosignal transmission receiving element (5);
Photosignal scattering receiving element (7) receives radiation direction and becomes space angle relation with main optical path, scattering light shield (8) is arranged on photosignal scattering receiving element (7) outside, is blocked by photosignal scattering receiving element (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520738940.0U CN205139008U (en) | 2015-09-22 | 2015-09-22 | Nephelometric light path structure of high precision measurement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520738940.0U CN205139008U (en) | 2015-09-22 | 2015-09-22 | Nephelometric light path structure of high precision measurement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205139008U true CN205139008U (en) | 2016-04-06 |
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| CN201520738940.0U Active CN205139008U (en) | 2015-09-22 | 2015-09-22 | Nephelometric light path structure of high precision measurement |
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| CN (1) | CN205139008U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107044970A (en) * | 2017-05-09 | 2017-08-15 | 福州普贝斯智能科技有限公司 | The online turbidity meter of lower range low-power consumption |
-
2015
- 2015-09-22 CN CN201520738940.0U patent/CN205139008U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107044970A (en) * | 2017-05-09 | 2017-08-15 | 福州普贝斯智能科技有限公司 | The online turbidity meter of lower range low-power consumption |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |