CN219573204U - Liquid level detection device based on light scattering - Google Patents
Liquid level detection device based on light scattering Download PDFInfo
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- CN219573204U CN219573204U CN202320369340.6U CN202320369340U CN219573204U CN 219573204 U CN219573204 U CN 219573204U CN 202320369340 U CN202320369340 U CN 202320369340U CN 219573204 U CN219573204 U CN 219573204U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The utility model relates to the technical field of water quality detection, and discloses a liquid level detection device based on light scattering, which comprises a light source and a light source fixing seat, wherein an emission diaphragm hole is formed in the light source fixing seat and used for restraining the direction and the diameter of a light source beam, so that a measuring beam is prevented from being influenced by manufacturing errors of a light source light emitting device. According to the liquid level detection device based on light scattering, liquid level detection is achieved by identifying the signal intensity difference between liquid scattered light and air scattered light of a pipeline based on the light scattering principle; the signal identification modes are various, single-point identification can be realized, signals of a plurality of photodiodes below the liquid level can be identified after being accumulated, and the anti-interference capability is high; the single-point or multi-point continuous liquid level detection can be realized by only one light source, and the device has the advantages of simple structure and low cost; the liquid level detection device can be suitable for liquid level detection of pipelines with various inner diameters by changing the diameter of the light source emission diaphragm hole, and has the advantages of stable performance, strong anti-interference capability and wide application range.
Description
Technical Field
The utility model relates to the technical field of water quality detection, in particular to a liquid level detection device based on light scattering.
Background
Liquid level measurement methods in the technical field of water quality detection generally comprise two main categories, namely contact measurement and non-contact measurement:
the contact measurement, through the sensor that is in direct contact with the liquid to be measured, the mechanical change of the liquid level position is finally converted into an electrical signal for identification, so as to realize the detection of the liquid level height; the main steps are as follows: the magnetostriction measuring method is used for realizing liquid level height measurement through the pulse time difference of a current magnetic field emitted by a magnetostriction instrument; the method for quantifying the liquid level by preventing sensors such as a floater on the liquid level is limited by the size, the density and the corrosion resistance of the floater, is not suitable for micro pipelines, is not suitable for low-density liquid, and is not suitable for detecting the liquid level of highly corrosive liquid in the water quality detection industry;
the non-contact measurement mainly comprises: differential pressure measurement: mainly utilizing the pressure principle of liquid. Detecting a relevant pressure difference, and judging the liquid level height according to the pressure difference, wherein the liquid level gauge is commonly used for detecting liquid level boundary measurement in an irregular container; capacitance measurement method: the liquid level sensor is realized by a capacitive liquid level sensor, and the change of the liquid level influences the change of the capacitor parameter of the sensor, so that the change of the liquid level sensor is indirectly converted into the change of the capacitance, and the liquid level measurement is realized; vertical optocoupler measurement: the liquid level detection is realized by the optocoupler sensor perpendicular to the axis of the pipeline, and the change of the liquid level influences the signal intensity received by the photodiode inside the optocoupler sensor.
The differential pressure type measuring method has higher requirement on the air tightness of the instrument, and the methods such as a capacitance type measuring method and the like have poor anti-interference capability (the property of liquid to be measured in the technical field of water quality detection is complex); the existing optical coupling type measuring method is generally based on the refraction principle when light passes through a transparent circular pipeline in the radial direction, has poor anti-interference capability when being applied to micro pipelines, is generally used for liquid level fixed point identification, needs a plurality of groups of optical coupling sensors when being applied to liquid level continuous detection, has a complex structure and is high in cost, and therefore, a liquid level detecting device based on light scattering is provided.
Disclosure of Invention
(one) solving the technical problems
Aiming at the defects of the prior art, the utility model provides a liquid level detection device based on light scattering, which is provided with a liquid level detection device based on the light scattering principle and is realized by identifying the difference of the signal intensity of liquid scattering light and air scattering light of a pipeline; the signal identification mode is various, single-point identification can be realized, signals of a plurality of photodiodes below the liquid level can be identified after being accumulated, the anti-interference capability is high, and the like, and the problems in the background technology are solved.
(II) technical scheme
The utility model provides the following technical scheme: a light scattering-based liquid level detection device, comprising: the light source and the light source fixing seat are provided with an emission diaphragm hole, and the emission diaphragm hole is used for restraining the direction and the diameter of a light source beam so as to ensure that a measuring beam is not influenced by the manufacturing error of a light source light emitting device;
the transmitting diaphragm hole and the measuring beam are collinear with the axis of the transparent pipeline;
the photoelectric diode and the photoelectric diode fixing seat are provided with a receiving diaphragm hole.
Preferably, the diameter of the emission diaphragm hole is phi 0.5-phi 3mm.
Preferably, the receiving diaphragm aperture position: the included angle between the outlet and the axis of the pipeline is 45 degrees < alpha 1<135 degrees, and the outlet position is opposite to the receiving surface of the photodiode.
Preferably, the diameter of the receiving diaphragm hole is phi 1-phi 3mm; the number of receiving diaphragm holes is at least 1.
Preferably, non-contact measurements are used for transparent, highly corrosive liquids.
Preferably, the liquid level detection is realized by identifying the signal intensity difference between the scattered light of the liquid in the pipeline and the scattered light of the air based on the scattering principle of the light.
A light scattering-based liquid level detection method, the detection method comprising the steps of:
s1, starting a light source, and obtaining a measuring beam after light rays emitted by the light source pass through an emission diaphragm hole on a light source fixing seat;
s2: turning on the photodiode to read a blank value a (an air scattering value at this time);
s3: the liquid enters the transparent pipeline, and when the liquid level reaches the receiving diaphragm hole, the signal of the photodiode starts to change and an extremum b appears;
s4: continuously filling liquid until the liquid level exceeds the receiving diaphragm hole, and stabilizing the signal value of the photodiode to c;
s5: pushing back the liquid, stopping when the extreme value b of the photodiode reappears, and completing the liquid level detection
Preferably, the light source stop diameter: phi=1.5 mm;
receiving aperture stop diameter: phi=2.5 mm;
α1＝90°；
the transparent tube has an outer diameter phi 8mm and an inner diameter D=4mm.
Compared with the prior art, the utility model provides a liquid level detection device based on light scattering, which has the following beneficial effects:
according to the liquid level detection device based on light scattering, liquid level detection is achieved by identifying the signal intensity difference between liquid scattered light and air scattered light of a pipeline based on the light scattering principle; the signal identification modes are various, single-point identification can be realized, signals of a plurality of photodiodes below the liquid level can be identified after being accumulated, and the anti-interference capability is high; the single-point or multi-point continuous liquid level detection can be realized by only one light source, and the device has the advantages of simple structure and low cost; the liquid level detection device can be suitable for liquid level detection of pipelines with various inner diameters by changing the diameter of the light source emission diaphragm hole, and has the advantages of stable performance, strong anti-interference capability, simple structure, low cost and wide application range.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model.
Wherein: 1. a light source; 2. an emission diaphragm aperture; 3. measuring the light beam; 4. receiving a diaphragm aperture; 5. refracting light; 6. a transparent tube; 7. a liquid surface; 8. a photodiode; 9. a photodiode holder; 10. a light source fixing seat.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1, a method and an apparatus for measuring axial liquid level of a circular pipe, in which only left-side optical paths are labeled, and in practice, the left-side optical paths and the right-side optical paths are the same, include:
a light source 1, a light source fixing seat 10; wherein the light source fixing seat 10 is provided with an emission diaphragm hole 2 with the diameter phi of 0.5-phi 3mm, which is used for restricting the direction and the diameter of the light source beam and ensuring that the measuring beam is not influenced by the manufacturing error of the light source light emitting device.
The emission diaphragm aperture 2 and the measuring beam 3 are collinear with the axis of the transparent tube 6.
A photodiode 8, a photodiode holder 9; wherein the designated position of the photodiode fixing seat is provided with a receiving diaphragm hole 4, an included angle between the receiving diaphragm hole and the axis of the pipeline is 45 degrees < alpha 1<135 degrees, and the outlet position is opposite to the receiving surface of the photodiode; the diameter of the receiving diaphragm hole 4 is phi 1-phi 3mm; and the number of the receiving diaphragm holes 4 is more than or equal to 1, the measuring light beam 3 enters the water-based micro lens, and the light beam is refracted for a plurality of times through the liquid surface 6, the pipe wall and the like to obtain refracted light 5, and the refracted light is received by the photodiode 8 after passing through the receiving holes.
The detection method comprises the following steps:
s1, starting a light source 1, and screening light rays emitted by the light source 1 through an emission diaphragm hole 2 on a light source fixing seat 10 to obtain a measuring light beam 3;
s2: turning on the photodiode 8 to read a blank value a (an air scattering value at this time);
s3: the liquid enters the transparent pipe 6, when the liquid level 7 reaches the receiving diaphragm aperture 4, the signal of the photodiode 8 starts to change and an extreme value b appears;
s4: continuing to fill the liquid until the liquid level 7 exceeds the receiving diaphragm hole 4, and stabilizing the signal value of the photodiode 8 to c;
s5: pushing back the liquid, stopping when the extreme value b of the photodiode 8 appears again, and completing the liquid level detection.
Preferably: light source aperture diameter: phi=1.5 mm;
receiving aperture stop diameter: phi=2.5 mm;
α1＝90°
the transparent tube has an outer diameter phi 8mm and an inner diameter D=4mm.
The utility model provides a novel measuring method and a measuring device, which solve the defects of the prior liquid level detection background technology in the technical field of water quality detection; the method has the following advantages:
1. the non-contact measurement is suitable for transparent and highly corrosive liquid.
2. Based on the scattering principle of light, the liquid level detection is realized by identifying the signal intensity difference between the scattered light of the liquid in the pipeline and the scattered light of the air; the signal identification modes are various, single-point identification can be realized, signals of a plurality of photodiodes below the liquid level can be identified after being accumulated, and the anti-interference capability is high.
3. The single-point or multi-point continuous liquid level detection can be realized by only one light source, and the device has a simple structure and low cost.
4. The liquid level detection method can be suitable for liquid level detection (including micro-pipelines, phi 1.5 mm-phi 6 mm) of pipelines with various inner diameters by changing the diameter of the light source emission diaphragm hole.
In conclusion, the anti-interference device has the advantages of stable performance, strong anti-interference capability, simple structure, low cost and wide application range.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A liquid level detection device based on light scattering, characterized in that: comprising the following steps:
the light source comprises a light source (1) and a light source fixing seat (10), wherein an emission diaphragm hole (2) is formed in the light source fixing seat (10), and the emission diaphragm hole (2) is used for restraining the direction and the diameter of a light source beam, so that a measuring beam is not influenced by the manufacturing error of a light source light emitting device;
the transmitting diaphragm hole (2) and the measuring beam (3) are collinear with the axis of the transparent pipeline (6);
the photoelectric diode (8) and the photoelectric diode fixing seat (9), wherein the photoelectric diode fixing seat (9) is provided with a receiving diaphragm hole (4).
2. The light scattering-based level detection device of claim 1, wherein: the diameter of the emission diaphragm hole (3) is phi 0.5-phi 3mm.
3. The light scattering-based level detection device of claim 1, wherein: the diameter of the receiving diaphragm hole (4) is phi 1-phi 3mm; the number of receiving diaphragm holes (4) is at least 1.
4. The light scattering-based level detection device of claim 1, wherein: non-contact measurement is used for transparent and highly corrosive liquids.
5. The light scattering-based level detection device of claim 1, wherein: based on the scattering principle of light, the liquid level detection is realized by identifying the signal intensity difference between the scattered light of the liquid in the pipeline and the scattered light of the air.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320369340.6U CN219573204U (en) | 2023-03-02 | 2023-03-02 | Liquid level detection device based on light scattering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320369340.6U CN219573204U (en) | 2023-03-02 | 2023-03-02 | Liquid level detection device based on light scattering |
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| Publication Number | Publication Date |
|---|---|
| CN219573204U true CN219573204U (en) | 2023-08-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202320369340.6U Active CN219573204U (en) | 2023-03-02 | 2023-03-02 | Liquid level detection device based on light scattering |
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2023
- 2023-03-02 CN CN202320369340.6U patent/CN219573204U/en active Active
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