CN215727692U - Reflection type turbidity sensor - Google Patents
Reflection type turbidity sensor Download PDFInfo
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- CN215727692U CN215727692U CN202121280728.6U CN202121280728U CN215727692U CN 215727692 U CN215727692 U CN 215727692U CN 202121280728 U CN202121280728 U CN 202121280728U CN 215727692 U CN215727692 U CN 215727692U
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Abstract
The application discloses reflective turbidity sensor, reflective turbidity sensor includes: the sampling device comprises a first reflecting side wall and a second reflecting side wall which are oppositely arranged, wherein a sampling channel with a preset width is arranged between the first reflecting side wall and the second reflecting side wall; an emitter for emitting detection light; a detector for collecting the detection light; when liquid to be detected is arranged in the sampling channel, the detection light emitted by the emitter is reflected in the sampling channel and then enters the detector, and the detector generates an electrical parameter related to the turbidity of the liquid to be detected based on the collected detection light. This scheme can detect the longer light path length of light through the reflection when sampling channel width is less, and the turbidity of the liquid that awaits measuring of judgement that can be accurate improves and detects the precision.
Description
Technical Field
The application relates to the technical field of turbidity sensors, in particular to a reflection-type turbidity sensor
Background
Along with the development of scientific technology and the improvement of user demands, more and more sensing technologies are widely applied to daily life and work of people, great convenience is brought to the daily life and work of people, and the sensing technology becomes an indispensable important tool for people at present.
The turbidity sensor is a low-cost sensor specially used for household appliances, and is mainly used for measuring the water turbidity degree of products such as washing machines, dish washing machines and the like. The cleanliness of the washed articles is judged by measuring the dirty degree of water, so that the optimal washing time is determined, the washing effect can be ensured, and the waste of water and electricity can be avoided.
In the prior art, when the turbidity of water in the cleaning equipment is reduced to a certain degree, impurities in the water have little influence on the photocurrent of the receiving end of the turbidity sensor, so that whether the water is thoroughly cleaned or not can not be accurately distinguished, and the resolution ratio is low.
SUMMERY OF THE UTILITY MODEL
In view of this, the application provides a reflective turbidity sensor, can detect the longer light path length of light through the reflection when sampling channel width is less, and the turbidity of the liquid that can be measured of accurate judgement improves and detects the precision.
In order to achieve the above purpose, the present application provides the following technical solutions:
a reflective turbidity sensor, comprising:
the sampling device comprises a first reflecting side wall and a second reflecting side wall which are oppositely arranged, wherein a sampling channel with a preset width is arranged between the first reflecting side wall and the second reflecting side wall;
an emitter for emitting detection light;
a detector for collecting the detection light;
when liquid to be detected is arranged in the sampling channel, the detection light emitted by the emitter is reflected in the sampling channel and then enters the detector, and the detector generates an electrical parameter related to the turbidity of the liquid to be detected based on the collected detection light.
Preferably, in the above-mentioned reflective turbidity sensor, there is a package housing having opposite first and second surfaces;
the emitter and the detector are packaged in the packaging shell;
the first surface is provided with a groove which is used as the sampling channel, and two opposite side walls of the groove are the first reflecting side wall and the second reflecting side wall respectively.
Preferably, in the above-described reflective turbidity sensor, the first reflective sidewall and the second reflective sidewall are both reflective planes, and the two reflective planes are arranged in parallel.
Preferably, in the above-described reflective turbidity sensor, the first reflective sidewall has a light exit, and the emitter is disposed opposite to the light exit and emits the detection light to the sampling channel through the light exit;
the second reflecting side wall is provided with a light inlet, and the detector collects the detection light reflected in the sampling channel through the light inlet;
the emitter is parallel to the optical axis of the detector, and the optical axis has a non-zero included angle with the normal of the reflecting plane.
Preferably, in the above-described reflective turbidity sensor, the first reflective sidewall is provided with a light outlet and a light inlet;
the emitter is arranged opposite to the light outlet, and emits detection light to the sampling channel through the light outlet; the detector collects the detection light reflected in the sampling channel through the light inlet;
the emitter is intersected with the optical axis of the detector, and the emitter and the optical axis of the detector have the same non-zero included angle with the normal of the second reflection side wall.
Preferably, in the above-mentioned reflective turbidity sensor, a circuit board is provided in the package housing, and the emitter and the detector are electrically connected to the circuit board;
the second surface is provided with a power pin and an output pin which are connected with the circuit board, the power pin is used for inputting working voltage for the reflective turbidity sensor, and the output pin is used for outputting the electrical parameters.
Preferably, in the above-mentioned reflective turbidity sensor, the emitter is an infrared diode;
the detector is an infrared phototriode.
Preferably, in the above reflective turbidity sensor, the light exit side of the emitter is a first convex structure, and a first light guide pillar is attached and fixed to the surface of the first convex structure; one side of the first light guide column is a first concave curved surface matched with the first convex structure, and the other opposite side of the first light guide column is a plane flush with the light outlet;
the light emitting side of the detector is provided with a second convex structure, and a second light guide column is attached and fixed to the surface of the second convex structure; one side of the second light guide column is a second concave curved surface matched with the second convex structure, and the other opposite side of the second light guide column is a plane flush with the light inlet.
As can be seen from the above description, in the reflective turbidity sensor provided in the present application, the reflective turbidity sensor includes: the sampling channel is provided with a preset width between the first reflection side wall and the second reflection side wall, when liquid to be detected is arranged in the sampling channel, detection light emitted by the emitter is reflected in the sampling channel and then enters the detector, and the detector generates electric parameters related to the turbidity of the liquid to be detected based on the collected detection light. This scheme can detect the longer light path length of light through the reflection when sampling channel width is less, and the turbidity of the liquid that awaits measuring of judgement that can be accurate improves and detects the precision.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
The structures, proportions, and dimensions shown in the drawings and described in the specification are for illustrative purposes only and are not intended to limit the scope of the present disclosure, which is defined by the claims, but rather by the claims, it is understood that these drawings and their equivalents are merely illustrative and not intended to limit the scope of the present disclosure.
FIG. 1 is a top view of a turbidity sensor;
FIG. 2 is a cross-sectional view of the turbidity sensor of FIG. 1, taken in the direction AA';
FIG. 3 is a top view of a reflective turbidity sensor according to an embodiment of the present invention;
FIG. 4 is a cut-away view of the reflective turbidity sensor of FIG. 3, taken in the direction of BB';
FIG. 5 is a top view of another reflective turbidity sensor provided in accordance with an embodiment of the present invention.
Detailed Description
Embodiments of the present application will now be described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the application are shown, and in which it is to be understood that the embodiments described are merely illustrative of some, but not all, of the embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The turbidity sensor is a low-cost sensor specially used for household appliances, and is mainly used for measuring the water turbidity degree of products such as washing machines, dish washing machines and the like. The degree of cleanliness of the washed items is judged by measuring the degree of contamination of the water, thereby determining an optimum washing time.
The impurity and the pollutant of current domestic washing machine, dish washer in the early cleaning process aquatic are more, and infrared turbidity sensor of correlation formula all can effectively detect, and the detergent of aquatic impurity and pollutant but the aquatic is few when wasing the later stage is not certain sanitization, and general turbidity sensor can't distinguish.
Referring to fig. 1 and 2, fig. 1 is a top view of a turbidity sensor, and fig. 2 is a cross-sectional view of the turbidity sensor shown in fig. 1 in the AA' direction. The turbidity sensor is a correlation type optical turbidity sensor, infrared light is used as a light sensing device of the turbidity sensor, the turbidity sensor is provided with an infrared emitter and an infrared detector which are arranged oppositely, the infrared emitter emits infrared light through an emitting end 11, the infrared detector collects the infrared light through a receiving end 12, the emitting end 11 adopts an infrared emitting diode with the wavelength of 940nm, the receiving end 12 adopts a phototriode with the response wavelength of 750 plus material of 1100nm, the emitting end 11 and the receiving end 12 are arranged oppositely, the emitting end 11 and the receiving end 12 are arranged in a packaging shell, and a sampling channel 13 with the preset width L is arranged between the emitting end 11 and the receiving end 12.
In this manner, the turbidity of the water in the sampling channel 13 affects the photocurrent of the receiving end 12, and the turbidity of the water is detected by the change in the photocurrent of the receiving end 12.
And, the width that receives whole overall dimension's restriction sampling channel 13 is less, only about 7mm, and the water sample volume in the restriction sampling channel 13 that receives sampling channel 13 width is less, and when the turbidity of cleaning equipment aquatic reduces to certain degree, the influence of aquatic impurity to the photocurrent of turbidity sensor receiving end has been very little, can not accurately distinguish whether thoroughly rinse clean, and the turbidity sensor resolution ratio of this scheme is on the low side.
Therefore, the application provides a reflective turbidity sensor, under the limited circumstances of sampling channel size, detects the longer light path length of light through the reflection, and the turbidity of the liquid that awaits measuring of judgement that can be accurate improves and detects the precision.
The embodiment of this application provides a reflective turbidity sensor includes:
the sampling device comprises a first reflecting side wall and a second reflecting side wall which are oppositely arranged, wherein a sampling channel with a preset width is arranged between the first reflecting side wall and the second reflecting side wall;
an emitter for emitting detection light;
a detector for collecting the detection light;
when liquid to be detected is arranged in the sampling channel, the detection light emitted by the emitter is reflected in the sampling channel and then enters the detector, and the detector generates an electrical parameter related to the turbidity of the liquid to be detected based on the collected detection light.
This reflective turbidity sensor's transmitting terminal is not relative with the receiving terminal, and the transmitting terminal adopts infrared diode, and the purpose is the light of sending a bundle of narrow angle, and the receiving terminal adopts infrared photodiode or infrared phototriode, and the sampling passageway both sides that transmitting terminal and receiving terminal correspond all are the mirror surface, and infrared diode will detect the light through certain incident angle and launch to the mirror surface opposite on, will detect light reflection to the receiving terminal after the multiple reflection through two mirror surfaces. Compared with a correlation type, the light path is lengthened under the condition that the size of a sampling channel of the reflection type turbidity sensor is limited, the influence of impurities in water on light can be larger, and the turbidity detection resolution of the water can be improved.
According to the description, when the liquid to be detected is arranged in the sampling channel, the detection light emitted by the emitter is reflected in the sampling channel and then enters the detector, and the detector generates the electric parameters related to the turbidity of the liquid to be detected based on the collected detection light. This scheme can detect the longer light path length of light through the reflection when sampling channel width is less, the turbidity of the liquid that can be accurate judgement awaits measuring to improve and detect the precision.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, the present application is described in further detail with reference to the accompanying drawings and the detailed description.
Referring to fig. 3 and 4, fig. 3 is a top view of a reflective turbidity sensor according to an embodiment of the present invention, and fig. 4 is a cross-sectional view of the reflective turbidity sensor shown in fig. 3 in the direction BB'. As shown in fig. 3 and 4, the reflective turbidity sensor includes:
a first reflective sidewall 21 and a second reflective sidewall 22 which are oppositely arranged, wherein a sampling channel 23 with a preset width is arranged between the first reflective sidewall 21 and the second reflective sidewall 22;
an emitter 24, the emitter 24 for emitting detection light;
a detector 25, the detector 25 for collecting the detection light;
when the liquid to be detected is in the sampling channel 23, the detection light emitted from the emitter 24 is reflected in the sampling channel 23 and then enters the detector 25, and the detector 25 generates an electrical parameter related to the turbidity of the liquid to be detected based on the collected detection light. The dotted line in the figure is the light path trajectory.
Wherein the emitter 24 may be an infrared diode; the detector 25 may be an infrared phototransistor.
In the embodiment of the present application, the width of the sampling channel 23 is not more than 7mm, and may be 5mm or 6 mm. Since the reflection increases the optical path length, which is greater than the width of the sampling channel 23, a smaller sampling channel 23 can be used to achieve higher sensitivity.
As shown in fig. 3 and 4, the reflective turbidity sensor has an encapsulating housing 26, the encapsulating housing 26 having opposite first and second surfaces; the emitter 24 and the detector 25 are enclosed in the package housing 26; the first surface has a groove as the sampling channel 23, and two opposite side walls of the groove are the first reflective side wall 21 and the second reflective side wall 22, respectively.
The first reflective sidewall 21 and the second reflective sidewall 22 are both reflective planes, and the two reflective planes are arranged in parallel. It is convenient to arrange a reflection light path so as to carry out turbidity calculation.
Wherein the package housing 26 has a circuit board (not shown) therein, and the emitter 24 and the detector 25 are electrically connected to the circuit board; the second surface is provided with a power pin and an output pin which are connected with the circuit board, the power pin is used for inputting working voltage for the reflective turbidity sensor, and the output pin is used for outputting the electrical parameters.
In the embodiment of the present invention, when the liquid to be measured is present in the sampling channel 23, the detection light emitted from the emitter 24 is reflected in the sampling channel 24 and then enters the detector 25, and the detector 25 generates an electrical parameter related to the turbidity of the liquid to be measured based on the collected detection light. This scheme can detect the longer light path length of light through the reflection when 23 width of sampling channel are less, and the turbidity of the liquid that can be accurate judgement awaits measuring improves and detects the precision.
As shown in fig. 3 and 4, the light-emitting side of the emitter 24 is a first convex structure, and a first light guide pillar 27 is attached and fixed on the surface of the first convex structure; one side of the first light guide pillar 27 is a first concave curved surface adapted to the first convex structure, and the other opposite side is a plane flush with the light outlet; the first concave curved surface and the first convex structure are in gapless fit and fixation.
The light-emitting side of the detector 25 is a second convex structure, and a second light guide column 28 is attached and fixed on the surface of the second convex structure; one side of the second light guide pillar 28 is a second concave curved surface adapted to the second convex structure, and the other opposite side is a plane flush with the light inlet. And the second concave curved surface is fixedly attached to the second convex structure in a gapless manner.
The first light guide pillar 27 may be an infrared-transparent glass light guide pillar or a light-transparent high polymer light guide pillar; the second light guide pillar 25 may be an infrared-transparent glass light guide pillar or a light-transparent high polymer light guide pillar.
It should be noted that the emitter 24 and the detector 25 have the same height relative to the second surface of the package housing 26. The emitter 24 and the detector 25 may be respectively disposed at two sides of the sampling channel 23, or disposed at the same side of the sampling channel 23.
In one version, as shown in fig. 3 and 4, the emitter 24 and detector 25 are disposed on either side of the sampling channel 23. The first reflective sidewall 21 has a light exit, and the emitter 24 is disposed opposite to the light exit, and emits detection light to the sampling channel 23 through the light exit; the second reflecting side wall 22 has a light inlet, and the detector 25 collects the detection light reflected in the sampling channel 23 through the light inlet; wherein the emitter 24 is arranged parallel to the optical axis of the detector 25, and the optical axis has a non-zero angle with the normal of the reflection plane. The included angle may be greater than 20 °, less than 40 °, or may be 28 °.
Alternatively, as shown in fig. 5, fig. 5 is a top view of another reflective turbidity sensor provided in an embodiment of the present invention, wherein the emitter 24 and the detector 25 are both disposed on one side of the sampling channel 23. The first reflecting side wall 21 is provided with a light outlet and a light inlet; the emitter 24 is arranged opposite to the light outlet, and emits detection light to the sampling channel 23 through the light outlet; the detector 25 collects the detection light reflected in the sampling channel 23 through the light inlet; the optical axis of the emitter 24 intersects with the optical axis of the detector 25, and the optical axis of the emitter 24 and the optical axis of the detector 25 have the same non-zero included angle with the normal of the second reflective sidewall 22. The included angle may be greater than 20 °, less than 40 °, or may be 28 °.
In the embodiment of the utility model, under the condition that the overall external dimension is limited, the emitter 24 uses an infrared diode, the light-emitting angle of the infrared diode is within +/-2 degrees through an optical design, the detector 25 uses an infrared photodiode or an infrared phototriode, the emitter 24 and the detector 25 can be arranged on two sides of the sampling channel 23 or on the same side of the sampling channel 23, no matter which side is arranged, the emitter 24 and the detector 25 are not opposite, the two sides of the emitter 24 and the detector 25 are provided with mirror surfaces, the infrared diode emits detection light to the opposite mirror surface through a certain incident angle, the detection light is reflected to the detector 25 after multiple reflections of the two mirror surfaces, and the detector 25 receives all the reflected light through the optical design, so that the light path length is prolonged, and the detection resolution of the reflective turbidity sensor is improved.
The infrared diode is characterized in that the light-emitting angle is small, the light-emitting angle of the infrared diode can be guaranteed to be within +/-2 degrees through optical design, the infrared diode is installed in the packaging shell 26 of the reflective turbidity sensor at a certain incident angle, the detection light emitted by the infrared diode is guided out by the first light guide column 27, and the light can be emitted onto the opposite mirror surface.
The two side walls of the sampling channel 23 are processed into mirror surfaces through processing, a reflecting layer can be formed through polishing or electroplating, light emitted by the infrared diode reaches a light inlet of the detector 25 after being reflected for multiple times by the mirror surfaces on the two sides, the size of a receiving spherical surface of the emitter 24 is designed through detecting the size of a light spot reaching the light inlet after being emitted, so that the emitted detection light is completely received, the detector 25 is also installed in a packaging shell 26 of the reflective turbidity sensor, and the detection light is guided to a light receiving surface of the detector through the second light guide column 28.
In the embodiment of the present invention, when the liquid to be measured is present in the sampling channel 23, the detection light emitted from the emitter 24 is reflected in the sampling channel 24 and then enters the detector 25, and the detector 25 generates an electrical parameter related to the turbidity of the liquid to be measured based on the collected detection light. This scheme can detect the longer light path length of light through the reflection when 23 width of sampling channel are less, and the turbidity of the liquid that can be accurate judgement awaits measuring improves and detects the precision.
The electrical parameter in the embodiment of the present application is the photocurrent of the detector 25. The inventor researches and discovers that the turbidity X of the liquid to be measured and the electrical parameter Y have the following corresponding relation:
Y＝f(X)
the corresponding relation can be determined by collecting the light currents under different liquid turbidity to be measured and performing linear fitting. The turbidity X of the liquid to be detected can be accurately calculated through the electrical parameter Y, and the detection precision is improved.
In the embodiment of the present application, the optical path length is increased by detecting multiple reflections of light, and the optical path length is calculated by the incident angle of 28 ° as shown in fig. 3, which is not limited to 28 °, and may be set as required. The width of the sampling channel 23 is L, and the calculation can be carried out through trigonometric function relation
L1 ═ 1.13L, similarly, L1 ═ L2 ═ L3 ═ 1.13L, and the total optical path length ═ L1+ L2+ L3 ═ 3.39L; the optical path length of the correlation type turbidity sensor is L, and the optical path length of the reflection type turbidity sensor is 3.39 times of that of the correlation type turbidity sensor calculated according to the incident angle shown in figure 3, so that the detection precision is also improved by 3.39 times.
It should be noted that, in the present application, the first reflection sidewall 21 and the second reflection sidewall 22 are used to reflect the detection light once, and obviously, the number of times of reflection of the detection light on the first reflection sidewall 21 and the second reflection sidewall 22 may be set by an incident angle, a channel length, and a distance between the reflector and the detector in the channel length direction, which is not specifically limited in the embodiment of the present application.
The embodiments in the present description are described in a progressive manner, or in a parallel manner, or in a combination of a progressive manner and a parallel manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments can be referred to each other.
It should be noted that in the description of the present application, it is to be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only used for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present application. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in an article or device that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A reflective turbidity sensor, comprising:
the sampling device comprises a first reflecting side wall and a second reflecting side wall which are oppositely arranged, wherein a sampling channel with a preset width is arranged between the first reflecting side wall and the second reflecting side wall;
an emitter for emitting detection light;
a detector for collecting the detection light;
when liquid to be detected is arranged in the sampling channel, the detection light emitted by the emitter is reflected in the sampling channel and then enters the detector, and the detector generates an electrical parameter for calculating the turbidity of the liquid to be detected based on the collected detection light.
2. The reflective turbidity sensor of claim 1, having an encapsulating housing with first and second opposed surfaces;
the emitter and the detector are packaged in the packaging shell;
the first surface is provided with a groove which is used as the sampling channel, and two opposite side walls of the groove are the first reflecting side wall and the second reflecting side wall respectively.
3. The reflective turbidity sensor of claim 2 wherein said first and second reflective sidewalls are both reflective planes, said reflective planes being disposed in parallel.
4. The reflective turbidity sensor of claim 3, wherein said first reflective sidewall has a light exit port, and wherein said emitter is disposed opposite said light exit port and emits detection light through said light exit port toward said sampling channel;
the second reflecting side wall is provided with a light inlet, and the detector collects the detection light reflected in the sampling channel through the light inlet;
the emitter is parallel to the optical axis of the detector, and the optical axis has a non-zero included angle with the normal of the reflecting plane.
5. The reflective turbidity sensor of claim 3, wherein said first reflective sidewall is provided with a light outlet and a light inlet;
the emitter is arranged opposite to the light outlet, and emits detection light to the sampling channel through the light outlet; the detector collects the detection light reflected in the sampling channel through the light inlet;
the emitter is intersected with the optical axis of the detector, and the emitter and the optical axis of the detector have the same non-zero included angle with the normal of the second reflection side wall.
6. The reflective turbidity sensor of claim 2 wherein said housing has a circuit board therein, said emitter and said detector being electrically connected to said circuit board;
the second surface is provided with a power pin and an output pin which are connected with the circuit board, the power pin is used for inputting working voltage for the reflective turbidity sensor, and the output pin is used for outputting the electrical parameters.
7. The reflective turbidity sensor of claim 1, wherein said emitter is an infrared diode;
the detector is an infrared phototriode.
8. The reflective turbidity sensor of claim 4, wherein the light exit side of the emitter is a first raised structure, and a first light guide pillar is attached and fixed to the surface of the first raised structure; one side of the first light guide column is a first concave curved surface matched with the first convex structure, and the other opposite side of the first light guide column is a plane flush with the light outlet;
the light emitting side of the detector is provided with a second convex structure, and a second light guide column is attached and fixed to the surface of the second convex structure; one side of the second light guide column is a second concave curved surface matched with the second convex structure, and the other opposite side of the second light guide column is a plane flush with the light inlet.
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| CN202121280728.6U CN215727692U (en) | 2021-06-08 | 2021-06-08 | Reflection type turbidity sensor |
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| CN202121280728.6U CN215727692U (en) | 2021-06-08 | 2021-06-08 | Reflection type turbidity sensor |
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