SE2230143A1 - Water quality measurement device - Google Patents
Water quality measurement deviceInfo
- Publication number
- SE2230143A1 SE2230143A1 SE2230143A SE2230143A SE2230143A1 SE 2230143 A1 SE2230143 A1 SE 2230143A1 SE 2230143 A SE2230143 A SE 2230143A SE 2230143 A SE2230143 A SE 2230143A SE 2230143 A1 SE2230143 A1 SE 2230143A1
- Authority
- SE
- Sweden
- Prior art keywords
- emitting element
- water
- infra
- light emitting
- receptacle
- Prior art date
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 136
- 238000005259 measurement Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 claims description 10
- 230000003287 optical effect Effects 0.000 claims description 9
- 238000005406 washing Methods 0.000 claims description 6
- 238000004064 recycling Methods 0.000 claims description 5
- ORQBXQOJMQIAOY-UHFFFAOYSA-N nobelium Chemical compound [No] ORQBXQOJMQIAOY-UHFFFAOYSA-N 0.000 description 40
- 239000012530 fluid Substances 0.000 description 14
- 238000001228 spectrum Methods 0.000 description 12
- 230000003746 surface roughness Effects 0.000 description 7
- 239000007921 spray Substances 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 230000000875 corresponding effect Effects 0.000 description 3
- 241001666377 Apera Species 0.000 description 2
- 230000032770 biofilm formation Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- -1 PETT Polymers 0.000 description 1
- 238000002835 absorbance Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000002329 infrared spectrum Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 229920005644 polyethylene terephthalate glycol copolymer Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 239000012488 sample solution Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000012086 standard solution Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/4738—Diffuse reflection, e.g. also for testing fluids, fibrous materials
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/18—Water
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
A water quality measurement device for measuring water quality, the water quality measuring device comprising: a white light emitting element configured to emit substantially white light, an infra-red light emitting element configured to emit substantially infra-red light, and a light receiving element configured to receive and detect light from the white light emitting element and the infra-red light emitting element; wherein, the white light emitting element is arranged co-axial and opposite the light receiving element, and wherein the emission axis of the infra-red emitting element is arranged substantially orthogonal the incident axis of the light receiving element.
Description
WATER QUALITY MEASUREMENT DEVICE Field of the Invention The present disclosure relates to a Water quality measurement device. In particular in relates to a Water quality measurement device comprising a White light emitting device, an infra-red light emitting device, and a light receiving device.
Background of the invention Optoelectrical devices for measuring the quality of Water are known in the field of measuring Water turbidity in household appliances such as Washing machines, dishwashers etc.
US 8,53l,670 B2 (EMZ Hanauer) describes an optical turbidity sensor for installation in a household Washing machine or dishwasher having separate subspaces for the provision of Water to be measured and the provision of the light-emitting and light- receiving elements.
It Would be ideal if devices did not require installation into the Water comprising compartment of Washing devices as such installations lead to a point of failure Where Water may leak from the Water comprising compartment.
Improved devices may furtherrnore be capable of detecting additional Water quality parameters.
Summary of the invention Accordingly, the present invention preferably seeks to mitigate, alleviate or eliminate one or more of the above-identified deficiencies in the art and disadvantages singly or in any combination and solves at least the above mentioned problems by providing a Water quality measurement device for measuring Water quality, the Water quality measuring device comprising: a White light emitting element conf1gured to emit substantially White light, an infra-red light emitting element conf1gured to emit substantially infra-red light, and a light receiving element conf1gured to receive and detect light from the White light emitting element and the infra-red light emitting element; Wherein, the White light emitting element is arranged co-axial and opposite the light receiving element, and wherein the emission axis of the infra-red emitting element is arranged substantially orthogonal the incident axis of the light receiving element.
A process for measuring water quality is also provided.
Further advantageous embodiments are disclosed in the appended and dependent patent claims.
Brief description of the drawings These and other aspects, features and advantages of which the invention is capable will be apparent and elucidated from the following description of embodiments of the present invention, reference being made to the accompanying drawings, in which Fig. 1 is a schematic top view of a water quality measurement device according to an aspect.
Fig. 2 is a schematic side view of a water quality measurement device according to an aspect.
Fig. 3 is a schematic side view of a water quality measurement device according to an aspect.
Detailed description Figure 1 shows a water quality measurement device 1 comprising a white light emitting element l00, an infra-red light emitting element l0l, and a light receiving element l02. The light receiving element l02 is arranged to receive light from the white light emitting element l00, and the infra-red light emitting element l0l.
The white light emitting element l00 is arranged co-axial and opposite the light receiving element l02. The white light emitting element l00 emits light toward the light receiving element l02. The light emitted from the white light emitting element l00 travels in a substantially straight path to the light receiving element l02. No reflectors or mirrors are provided to the device l. The emission axis of the infra-red light emitting element l0l is substantially orthogonal the incident axis of the light receiving element l02. The path of undisturbed or un-scattered light emitted from the white light emitting element l00 and the infra-red light emitting element 101 are shown in figure 1 by the dashed lines with arrows indicating the direction of light travel.
The emission axis of the infra-red light emitting element 101 is arranged substantially orthogonal the incident axis of the light receiving element 102. The infra- red light emitting element 101 is not co-axial to the light receiving element 102. The term substantially orthogonal as used herein means that the angle between the optical incident axis of the light receiving element 102 and the optical emission axis of the infra-red light emitting element 101 is from about 85° to about 95°, such as about 90°. The infra-red light emitting element 101 emits infra-red light in a direction substantially orthogonal to the axis formed between the white light emitting element 100 and the light receiving element 102. In such an arrangement only infra-red light scattered, absorbed or otherwise disturbed after leaving the infra-red light emitting element 101 is received at the light receiving element 102. If there is no disturbance, absorbance or scattering of the light emitted from the infra-red light emitting element 101 no, or very little infra-red light is received at the light receiving element 102.
As shown in figure 1, and is known within the field, each of the white light emitting element 100 and infra-red light emitting element 101 emit a cone of light, and therefore the optical emission axis is the centre axis of the emitted cone of light. Similarly, the light receiving element 102 has a viewing angle and receives incident light at an angle greater than 0° with respect to the central incident axis. The term light incident axis as used herein refers to the central incident axis.
The white light emitting element 100 ideally emits light across the wavelength spectrum from about 400 nm to about 750 nm. The infra-red light emitting element 101 may emit infra-red light in the infra-red spectrum from about 700 nm to about 1 mm, such as about 750 nm to about 900 nm.
The light receiving element 102 may be an ambient light sensor conf1gured to receive and detect infra-red, red, green and blue light. Ideally, the ambient light sensor is configured to detect red, green, blue and white light, where white light corresponds to broad spectrum detection over at least infra-red, red, green and blue wavelength spectrums.
Both the White light emitting element 100 and the infra-red light emitting element 101 may emit light into a volume of water, such as wash water in order to detect the quality of the water.
The white light emitting element 100, infra-red light emitting element 101 and the light receiving element 102 may be in some instances arranged in the same plane. In figure 1 the plane is a horizontal plane, however, the plane need not be horizontal. The plane referred to is the plane formed by the optical axes of the white light emitting element 100, infra-red light emitting element 101, and the theoretical incident axis of the light receiving element 102. In figure 3 the plane is marked as P and is formed along the dashed line and extends into the page. In figure 3 the white light emitting element 100 and the infra-red light emitting element 101 are shown, the light receiving element 102 is not shown as it is behind and co-axial the white light emitting element 100. The optical axis of the white light emitting element 100 is into the page in figure 3.
The white light emitted from the white light emitting element 100 traverses the volume of water and is received at the light receiving element 102. The white light emitted from the white light emitting element 100 has a substantially known wavelength spectrum and known intensity over the known spectrum. As the white light emitted from the white light emitting element 100 traverses the water volume the light is substantially filtered and the spectrum and intensity over the spectrum of the emitted white light is altered such that the received light at the light receiving element 102 has different intensities at different wavelengths compared to the white light emitted from the white light emitting element 100. The altered spectrum of white light received at the light receiving element 102 may be compared to the known emitted spectrum to determine water quality. For example, the colour of the water volume may be deterrnined by comparing the wavelength spectrum, and intensity at various wavelengths of the received light at the light receiving element 102 to the emitted white light from the white light emitting element 100. If the volume of water has a certain colour this can be deterrnined by comparing the relative intensities of the colours received at the light receiving element 102. For example, if the water is coloured red, due to for example a dye in the water, the red-coloured water will absorb light in the blue and/or green spectrum, leading to relatively lower intensities of blue and/or green light received at the light receiving element 102. Similarly, green coloured Water results in a reduction of the blue spectrum received at the light receiving element 102.
The infra-red light emitting element l0l emits infra-red light into the volume of Water to deterrnine Water quality. Infra-red light emitted from the infra-red light emitting element l0l traverses the volume of Water and is at least partially scattered by the Water, orthogonal to the light receiving element l02. A portion of the scattered light is received at the light receiving element l02. The portion of light received at the light receiving element l02 is correlated to the amount of scattering due to the Water. Water having a higher turbidity scatters more light, and therefore the portion of light received at the light receiving element l02 corresponds to the level of turbidity of the Water. That is, the more light received at the light receiving element l02 from the infra-red light emitting element l0 l , the greater the turbidity of the Water.
The Water quality measurement device l may comprise a receptacle 200 for receiving a volume of fluid 3, such as Wash Water. The receptacle 200 receives a volume of Water therein for a duration. The receptacle may be defined by at least one Wall 20l. The White light emitting element l00, infra-red light emitting element l0l and the light receiving element l02 are directed into the receptacle 200. The light emitted from the White light emitting element l00 is directed into the receptacle 200. The light emitted from the infra-red light emitting element l0l is directed into the receptacle 200. The light receiving element l02 has a sensor region l02l Which is directed into the receptacle. The light receiving element l02 receives light Which has been emitted into the receptacle. When fluid 3 is provided to the receptacle 200, the light from the White light emitting element l00 and/or the infra-red light emitting element l0l is emitted into the volume of fluid 3. When fluid 3 is provided to the receptacle 200, the light receiving element l02 receives light Which has passed through the fluid.
As stated above the path White light travels from the White light emitting element l00 to the light receiving element l02 is substantially straight and free from mirrors or reflecting elements. As Would be understood by the skilled person, some minor refraction to the light may occur due to the volume of Water, and the Wall 20l of the receptacle 200.
The White light emitting element l00, infra-red light emitting element l0l and the light receiving element l02 are provided extemal to the receptacle 200. That is, they are not provided within the receptacle and do not mechanically disturb the fluid within the receptacle 200. The white light emitting element 100, infra-red light emitting element 101 and light receiving element 102 may be separated from the volume of fluid within the receptacle 200 by the at least one wall 201. By providing the light emitting elements 100, 101 and the light receiving element 102 separate and extemal to the volume of fluid the white light emitting element 100, the infra-red light emitting element 101 and the light receiving element 102 are not subject to fouling, wear or other similar disturbances which may reduce the performance of the water quality measurement device 1. Additionally, by providing the white light emitting element 100, infra-red light emitting element 101 and the light receiving element 102 extemal to the water receptacle 200, the white light emitting element 100, infra-red light emitting element 101 and the light receiving element 102 are protected from damage due to contact with high temperature water.
The receptacle 200 has an inlet 210 at which water enters the receptacle 200. The receptacle 200 has an outlet 211 at which water exits the receptacle 200. The outlet 211 is separate to the inlet 210, that is, water is displaced through the receptacle 200. The receptacle is a flow-through receptacle 200, where the inlet 210 is separate to the outlet 21 1.
Water, such as wash water, flows into the device 1, specifically, water flows into the receptacle 200 at a flow rate. Water may be received within the device 1, specifically the receptacle 200, and partially, or fully f1ll the receptacle 200. Generally and ideally, the flow velocity of water within the receptacle 200 is lower than the flow velocity of water at the inlet 210 to the receptacle 200. That is, the velocity of water is reduced on entering the receptacle 200. This enables improved measuring performance.
Water flowing into the device 1 may flow at a flow rate of less than about 20 L/min, such as less than about 10 L/min, such as less than about 5 L/min. The present device 1 is especially suitable for measuring water at low rates. During a measurement process water may be restricted from flowing out of the receptacle 200, that is the output flow rate from the receptacle 200 may be less than the input flow rate, in some instances the output flow may be stopped, i.e., the output flow rate may be 0 L/min, during a measurement process. The output flow rate may be greater than 0 L/min during a measurement process. The flow velocity of water in the receptacle 200 during a measurement process is generally lower than the flow Velocity of water at the inlet to the receptacle 200, and/or lower than the Velocity of water at the outlet of the receptacle 200. Water received in the receptacle 200 may be received at Various flow rates depending on the device from which used water is received. The input and output flowrates may be controlled by valves provided upstream and downstream respectively to the receptacle 200.
The white light emitting element l00 may be provided at a first location 202 of the receptacle 200. The first location 202 may correspond to a substantially optically transparent portion of the at least one wall 20l of the receptacle 200.
The infra-red light emitting element l0l may be provided at a second location 203 of the receptacle 200. The second location 203 may correspond to a substantially optically transparent portion of the at least one wall 20l of the receptacle 200.
The light receiving element l02 may be provided at a third location 204 of the receptacle 200. The third location 204 may correspond to a substantially optically transparent portion of the at least one wall 20l of the receptacle 200.
Each of the white light emitting element l00, infra-red light emitting element l0l and light receiving element l02 may each be provided at respective locations 202, 203, 204 of the receptacle 200 corresponding to substantially optically transparent portions of the at least one wall 20l. Optically transparent as used herein means that light in the visible and infra-red wavelength spectrums may pass through without a substantial reduction in intensity. Each of the first 202, second 203, and third 204 locations may be substantially provided as regular wall portions. If the receptacle 200 is tubular then the 202, second 203, and third 204 locations may be provided at radial points of the receptacle 200. That is, they may be radially opposed.
The receptacle 200, and in particular the at least one wall 20l, may be manufactured from a polymer, such as a plastic, such as for example PET, PETG, PETE, PETT, and/or PMMA. The receptacle 200 may be moulded, such as blow moulded or injection moulded. The wall 20l thickness may be from about l mm to about 5 mm, a wall thickness of about 4 mm has been shown to display acceptable properties with respect to therrnal isolation, wall 20l structure strength, and optical transparency. The entire device l, including the receptacle 200 may be provided in a dark, environment. The device 1 may be encased or surrounded by an opaque housing to prevent ambient light entering the light receiving element 102.
The at least one wall 201 of the receptacle 200 has an intemal surface 2010 and an extemal surface 2011. The intemal surface 2010 is in contact with water received in the receptacle 200. The extemal surface 2011 is not in contact with water received in the receptacle 200. The intemal surface 2010, and/or the extemal surface 2011 at each of the first location 202, second location 203, and third location 203 may be manufactured or processed such that it has a low surface roughness. The low surface roughness reduces scattering of emitted/received light. The low surface roughness at the intemal surface 2010 is especially advantages in the present device 1 as it inhibits the formation and/or adhesion of a biofilm at the wall 201. As the device 1 is generally intended to measure the water quality of used water flowing at low flow rates, or zero flow rates, biofilm formation is a problem. Existing water quality measurement devices for measuring high flow-rate water in for example tubes or pipes are less susceptible to biofilm formation and often have relatively rougher surfaces. The low surface roughness may be achieved by polishing the first location 202, second location 203, or third location 204, after forrning the receptacle 200. Ideally, the low surface roughness is achieved during forrning, for example, moulding the receptacle 200 with specific low surface roughness regions and/or inserts to reduce surface roughness at the first, second and third locations 202, 203, 204.
A spray element may be provided to the device 1 to spray at least one stream of water at the intemal surface 2010 at the first location 202, the second location 203 and/or the third location 204. Ideally, and generally, the spray element sprays at least one stream of water at each of the first 202, second 203, and third surfaces 204. The stream of water cleans the intemal surface 2010 of debris, biofilm, etc and improves the performance of the device 1. By providing the white light emitting element 100, the infra-red light emitting element 101, and the light receiving element 102 at substantially planar walls the cleaning is improved. Especially when compared to prior-art solutions with irregular protrusions designed to be installed into a water receptacle.
The receptacle 200 may be a tubular tank, having a regular cylindrical wall 201.
The tubular tank has a diameter greater than the diameter of inlet tubing/piping etc, such that Water Velocity is reduced Within the receptacle 200 compared to the inlet Velocity. The tubular tank has a diameter greater than the diameter of outlet tubing/piping, such that the flow Velocity is reduced Within the receptacle 200, compared to the flow Velocity of Water Which has exited the receptacle. The regular cylindrical Wall is also ideal for spray cleaning.
An additional adVantage of proViding the White light emitting element l00, infra- red light emitting element l0l, and the light receiVing element l02 extemal to the receptacle 200 is that the flow of fluid Within the receptacle 200 is not disturbed.
The extemal surface 20ll of the Wall 20l of the receptacle 200 may comprises a plurality of separate slots for receiVing the White light emitting element l00, infra-red light emitting element l0l, and/or the light receiVing element l02. Each slot may be defined by a pair of opposing protruding ridges. Each of the slots may be located at the first 202, second 203, and third 204 locations respectiVely. The slots hold the White light emitting element l00, infra-red light emitting element l0l, and light receiVing element l02 in place at the Wall 20l and ease installation and alignment.
A process for measuring the quality of Water comprises: proViding the deVice l as described herein; proViding Water to the receptacle 200; emitting White light from the White light emitting element l00 such that White light is receiVed at the light receiVing element l02, emitting infra-red light from the infra-red light emitting element l0l such that reflected or refracted infra-red light is receiVed at the light receiVing element l02; and, measuring the intensity of receiVed White light and infra-red light at the light receiVing element l02. After receiVing the emitted infra-red and White light, the process may comprise comparing the measured receiVed intensity of light at the light receiVing element l02 to reference Values corresponding to clean, non-processed, Water.
The Water quality measurement deVice l as described herein is capable of deterrnining Water colour and/or Water turbidity. Ideally, the deVice l is capable of measuring both Water colour and Water turbidity. The Water quality measurement deVice l is ideal for measuring the Water quality of Wash Water from a dishWasher, Washing machine, Water recycling deVice, or other household or industrial deVice at Which Water is processed leading to changes to Water quality. As the White light emitting element l00, infra-red light emitting element 101, and light receiving element 102 are arranged external the receptacle 200 the Wash Water does not contact the elements 100, 101, 102.
The combination of the White light emitting element 100 and the infra-red light emitting element 101 enables improved detection of Water quality parameters of a fluid, and increases the potential to compensate for changes at the Wall 201 of the receptacle 200. By separately increasing the intensity of light emitted by the White light emitting element 100 and/or the infra-red light emitting element 101 and measuring the corresponding change in received light at the light receiving element 102 the condition of the receptacle 200 may be investigated. For example, if increasing the intensity of light emitted from the White light emitting element 100 increases the intensity of light received at the light receiving element 102, this indicates that the portions 202, 204 of the Wall 201 are substantially free from fouling. If, in contrast, increasing the intensity of light emitted from the infra-red light emitting element 101 does not result in an increase in intensity measured or detected at the light receiving element 102 then at least one of the portions 203, 204 may be fouled. The results of separate increases/decreases in intensity may be compared to determine Where the fouling is present. The results of the comparison may be used for calibration such that an offset and/or calibration factor may be provided to the detected results for ultimately deterrnining Water quality.
The Water quality measurement device 1 may comprise a temperature sensor for measuring the temperature of fluid. The temperature sensor may enable calibration of the measured optical data received at the light receiving element 102.
The light receiving element 102 may be conf1gured to detect light for a duration of about 20 ms to about 100 ms. Ideally the light receiving element 102 is configured to detect light for about 50 ms. A reduced duration of detection reduces the time required to measure a Water quality parameter.
The White light emitting element 100 may be arranged at a lateral (along the incidence axis of the White light emitting element 100) distance of greater than about 10 mm from the light receiving element 102. The White light emitting element 100 may be arranged at a distance of greater than about 20 mm, such as greater than about 40 mm, such as about 55 mm from the light receiving element 102. The distance enables the White light to travel through an increased portion of the fluid compared to if the White light 11 emitting element 100 and light receiving element 102 Were arranged closer together, reducing mismeasurement due to sampling of only a small volume of fluid.
The infra-red light emitting element 101 may be arranged at a lateral distance (along the incident axis of the light receiving element 102) of greater than about 10 mm, such as greater than about 20 mm from the light receiving element 102. A distance of greater than about 10 mm, such as greater than about 20 mm has shown to improve measurement performance compared to reduced distances. Without Wishing to be bound by theory, the improved performance may relate to the increased volume of fluid through Which the infra-red light travels, and reduced reflection due to increased distance to the Wall 201 in the vicinity of the light receiving element 102.
A Water recycling system may comprise the Water quality measurement device 1. The Water recycling system has improved Water recycling properties due to the improved measurement performance provided by the device 1.
A Water consumption device such as a Washing machine, or dishwasher may comprise the Water quality measurement device 1. The receptacle 200 of the device 1 receives Wash Water for measurement.
Experimental Section Experiment I Measurement of water turbidity at dififerent turbidity levels with water quality measurement device.
The Water quality measurement device 1 comprising a receptacle 200 Was prepared as described above. Samples of Water turbidity at 13 different levels Were prepared. The 13 turbidity levels ranged from 0 to 600 Nephelometric Turbidity Units (NTU). The NTU values for each of the samples Were deterrnined for each of the reference samples With a calibration unit, Apera TN400 Tubidity Meter (2021). The calibration unit Was itself calibrated With ISO 7027 Clear polymer standard solutions at 0.00, 20.0, 100, 400, 800 NTU respectively (Apera).
Infra-red light Was emitted from the infra-red light emitting element 101 at a specific intensity, and over a specific duration. Infra-red light Was detected at the light receiving element 102 for a specific measurement duration. 12 99 473 measurements Were performed of the 13 test samples. The device 1 displayed excellent spot on repeatability for all samples. The device 1 displayed a Level of Detection (LOD) of 0.04 NTU, and a level of quantification (LOQ) of 0.13 NTU.
Experiment 2 Measurement of water colour at clififerent dye levels with water quality measurement device.
The Water quality measurement device 1 comprising a receptacle 200 Was prepared as described herein. 10 sample solutions Were prepared With a concentration of black clothing dye (Dylon Renovator Black). Concentrations Were 0, 0.1, 0.4, 0.7, 1.3, 1.9, 3.3, 16.3, 29.0, 42.9 mg/L respectively.
White light Was emitted from the White light emitting element 100 and received at the light receiving element 102 for specific emission and measurement durations. 26100 measurements Were performed With excellent repeatability. The mean performance of the three Red, Green and Blue (RGB) channels Was deterrnined. The device 1 displayed a mean LOD of 33 ug/L, and a LOQ of 110 ug/L.
Although, the present invention has been described above With reference to specific embodiments, it is not intended to be limited to the specific form set forth herein. Rather, the invention is limited only by the accompanying claims.
In the claims, the term "comprises/comprising" does not exclude the presence of other elements or steps. Furthermore, although individually listed, a plurality of means, elements or method steps may be implemented by e.g., a single unit or processor. Additionally, although individual features may be included in different claims, these may possibly advantageously be combined, and the inclusion in different claims does not imply that a combination of features is not feasible and/or advantageous. In addition, a: aa a: a, singular references do not exclude a plurality. The terms , an", "first", "second" etc do not preclude a plurality. Reference signs in the claims are provided merely as a clarifying example and shall not be construed as limiting the scope of the claims in any Way.
Claims (2)
1.) according to any of claims 1 to 7, Wherein Water is received into the receptacle (200) via an inlet (210) and exits the receptacle (200) via a separate outlet (211). A process for measuring the quality of Water, comprising: -providing a device for measuring Water quality according to any of claims 2 to-providing Water to the receptacle (200), -emitting White light from the White light emitting element (100) such that White light is received at the light receiving element (102), -emitting infra-red light from the infra-red light emitting element (101) such that reflected or refracted infra-red light is received at the light receiving element (1
2.) -measuring the intensity of received White light and infra-red light at the light receiving element (102). The process for measuring Water quality according to claim 9, comprising comparing the measured received intensity of light at the light receiving element (102) to reference values corresponding to clean, non-processed, Water.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE2230143A SE2230143A1 (en) | 2022-05-13 | 2022-05-13 | Water quality measurement device |
| PCT/SE2023/050467 WO2023219553A1 (en) | 2022-05-13 | 2023-05-12 | Water quality measurement device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE2230143A SE2230143A1 (en) | 2022-05-13 | 2022-05-13 | Water quality measurement device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SE2230143A1 true SE2230143A1 (en) | 2023-11-14 |
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ID=89075220
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE2230143A SE2230143A1 (en) | 2022-05-13 | 2022-05-13 | Water quality measurement device |
Country Status (1)
| Country | Link |
|---|---|
| SE (1) | SE2230143A1 (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07243964A (en) * | 1994-03-07 | 1995-09-19 | Doriko Kk | Water quality measuring device, water quality measuring method, and waste water treating method |
| EP1228358A1 (en) * | 1999-10-18 | 2002-08-07 | Siemens Plc | Device for measuring water quality |
| US20130278921A1 (en) * | 2012-04-23 | 2013-10-24 | Samsung Electronics Co., Ltd. | Turbidity sensor and control method thereof |
| KR20130119357A (en) * | 2012-04-23 | 2013-10-31 | 삼성전자주식회사 | Turbidity sensor and control method thereof |
| JP2018194296A (en) * | 2017-05-12 | 2018-12-06 | テックス理研株式会社 | Self-diagnostic method of colored liquid detection apparatus |
-
2022
- 2022-05-13 SE SE2230143A patent/SE2230143A1/en unknown
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07243964A (en) * | 1994-03-07 | 1995-09-19 | Doriko Kk | Water quality measuring device, water quality measuring method, and waste water treating method |
| EP1228358A1 (en) * | 1999-10-18 | 2002-08-07 | Siemens Plc | Device for measuring water quality |
| US20130278921A1 (en) * | 2012-04-23 | 2013-10-24 | Samsung Electronics Co., Ltd. | Turbidity sensor and control method thereof |
| KR20130119357A (en) * | 2012-04-23 | 2013-10-31 | 삼성전자주식회사 | Turbidity sensor and control method thereof |
| JP2018194296A (en) * | 2017-05-12 | 2018-12-06 | テックス理研株式会社 | Self-diagnostic method of colored liquid detection apparatus |
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