WO2021229980A1 - 光学測定装置及び水質分析システム - Google Patents

光学測定装置及び水質分析システム Download PDF

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Publication number
WO2021229980A1
WO2021229980A1 PCT/JP2021/015336 JP2021015336W WO2021229980A1 WO 2021229980 A1 WO2021229980 A1 WO 2021229980A1 JP 2021015336 W JP2021015336 W JP 2021015336W WO 2021229980 A1 WO2021229980 A1 WO 2021229980A1
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Prior art keywords
light
measuring
light source
cell
scattered
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Ceased
Application number
PCT/JP2021/015336
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English (en)
French (fr)
Japanese (ja)
Inventor
一星 小林
啓伍 坂本
康平 原
公彦 有本
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Horiba Advanced Techno Co Ltd
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Horiba Advanced Techno Co Ltd
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Filing date
Publication date
Application filed by Horiba Advanced Techno Co Ltd filed Critical Horiba Advanced Techno Co Ltd
Priority to EP21804026.9A priority Critical patent/EP4137814B1/en
Priority to JP2022522571A priority patent/JP7559061B2/ja
Priority to CN202180033072.4A priority patent/CN115552220A/zh
Priority to US17/997,805 priority patent/US12265028B2/en
Priority to KR1020227038500A priority patent/KR102928240B1/ko
Publication of WO2021229980A1 publication Critical patent/WO2021229980A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/06—Investigating concentration of particle suspensions
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/06—Investigating concentration of particle suspensions
    • G01N15/075—Investigating concentration of particle suspensions by optical means
    • 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
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • 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
    • G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
    • G01N21/51—Scattering, i.e. diffuse reflection within a body or fluid inside a container, e.g. in an ampoule
    • 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
    • G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
    • G01N21/53—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke
    • G01N21/532—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke with measurement of scattering and transmission
    • 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
    • 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
    • G01N33/1893—Water using flow cells
    • 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
    • G01N21/03—Cuvette constructions
    • G01N21/031—Multipass arrangements
    • G01N2021/0314—Double pass, autocollimated path
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2201/00—Features of devices classified in G01N21/00
    • G01N2201/06—Illumination; Optics
    • G01N2201/063—Illuminating optical parts
    • G01N2201/0636—Reflectors

Definitions

  • the present invention relates to an optical measuring device for measuring the chromaticity and turbidity of a liquid sample and a water quality analysis system provided with the optical measuring device.
  • a chromaticity turbidity measuring device As an optical measuring device for measuring chromaticity and turbidity (hereinafter referred to as a chromaticity turbidity measuring device), as shown in Patent Document 1, the transmitted light transmitted through a liquid sample is detected to measure the chromaticity and turbidity. What to do is known.
  • this chromaticity turbidity measuring device for example, for water quality control of purified water supplied as tap water or wastewater from factories, residual chlorine and pH are considered not only from the viewpoint of chromaticity and turbidity but also from the viewpoint of water quality regulation. , Other water quality indicators such as conductivity may be required to be measured at the same time.
  • the optical path length between the light source and the photodetector becomes shorter. Then, there is a problem that the change in the transmitted light intensity with respect to the fluctuation of the chromaticity and the turbidity becomes small, the resolution is deteriorated, and the measurement accuracy is lowered.
  • the above-mentioned chromaticity turbidity measuring device performs measurement conforming to the water quality standards. I can't do it.
  • the present invention has been made in view of the above-mentioned problems, and measures turbidity and turbidity with high accuracy while reducing the size and adopting a turbidity measurement method based on the water quality standards of each country. That is the main issue.
  • the optical measuring device is an optical measuring device that measures the turbidity of the liquid sample by measuring the scattered light scattered by the liquid sample, and includes a cell accommodating the liquid sample and the said.
  • a light source for transmitted light measurement that irradiates the liquid sample in the cell with light for measuring transmitted light
  • the transmitted light A light detector that detects the transmitted light of the light for measurement and the scattered light of the scattered light measurement, and the light detection that is provided in the cell and reflects the light for the transmitted light measurement in the cell.
  • the light source for measuring scattered light is provided with a reflection mirror directed toward the device, and the light source for measuring scattered light is reflected toward a post-reflection light path which is an optical path of light for measuring transmitted light reflected by the reflection mirror and directed to the light detector. It is characterized in that the light for measuring scattered light is emitted so as to intersect the back light path at a predetermined angle.
  • the light for measuring transmitted light emitted from the light source for measuring transmitted light is reflected by the reflection mirror and directed toward the light detector.
  • the optical path length of the light for measuring the transmitted light in the cell.
  • the chromaticity or turbidity of purified water such as tap water can be accurately measured by transmitted light measurement.
  • the light source for measuring scattered light emits the light for measuring scattered light toward the light path after reflection of the light for measuring transmitted light so as to intersect the light path after reflection at a predetermined angle
  • the light detector scatters. The scattered light at a predetermined angle of the light for light measurement will be detected.
  • the distance between the turbidity measurement point and the photodetector can be shortened. As a result, it can be detected by the light detector before the scattered light of a predetermined angle scattered by the liquid sample is attenuated, and the turbidity of the liquid sample can be measured with high accuracy.
  • the transmitted light measuring light source, the scattered light measuring light source, and the photodetector are provided in the cell.
  • the length of the optical path between the turbidity measurement point and the light source for scattered light measurement in the after-reflection light path for measuring transmitted light is shortened, and scattered light at a predetermined angle is generated while suppressing the attenuation of the light for measuring scattered light. It is desirable that the light source for measuring scattered light is provided on the light path side after reflection in the cell.
  • the cell When the cell is provided with a light source for measuring turbidity and a photodetector, direct light from the light source for measuring scattered light may be detected by the photodetector in the internal space of the cell, which may reduce the measurement accuracy.
  • the light source for measuring scattered light emits light between the light source for measuring prescattered light and the light detector on the inner surface of the cell. It is desirable that a protrusion is formed to prevent the light for measuring the turbidity to be directly incident on the light detector.
  • the light source for measuring scattered light and the photodetector are arranged so as to sandwich the outlet, and the protrusion is formed between the outlet and the light source for measuring scattered light. It is desirable that it is formed between and. With this configuration, even if bubbles adhere or stay in or near the outlet, the light for measuring scattered light is suppressed from being scattered by the bubbles, and the accuracy of turbidity measurement is reduced. Can be prevented.
  • the optical analyzer of the present invention is configured so that the surface of the inner surface of the cell facing the light source for measuring scattered light does not reflect the light for measuring scattered light toward the photodetector. It is desirable to be there. With this configuration, it is possible to prevent the photodetector from detecting light other than the scattered light at a predetermined angle in the light for measuring scattered light, and improve the accuracy of turbidity measurement.
  • the optical measuring device 1 is a chromaticity turbidity measuring device 1 that optically measures the chromaticity and turbidity of a liquid sample.
  • this chromaticity turbidity measuring device 1 is provided, for example, at the end of a water supply pipe that distributes water purified at a water purification plant to each household, and monitors changes in the quality of water flowing through the water supply. It is used by being incorporated in the water quality analysis system 100.
  • the water quality analysis system 100 includes, for example, a residual chlorine concentration measuring device for measuring the residual chlorine concentration of a liquid sample, and a conductivity measuring device for measuring the conductivity of a liquid sample.
  • a pH measuring device for measuring the pH of a liquid sample, a pressure sensor, a temperature sensor, or the like may be included.
  • the turbidity measuring device 1 has a turbidity measuring optical system for measuring turbidity and a turbidity measuring optical system for measuring turbidity.
  • the chromaticity turbidity measuring device 1 includes a cell 2 accommodating a liquid sample and light for measuring transmitted light with respect to the liquid sample contained in the cell 2 (hereinafter, also referred to as light for measuring chromaticity).
  • the transmitted light measurement light source 3 (hereinafter, also referred to as chromaticity measurement light source 3) that irradiates the cell 2 and the scattered light measurement light (hereinafter, turbidity measurement) for the liquid sample contained in the cell 2.
  • the scattered light measurement light source 4 (hereinafter, also referred to as turbidity measurement light source 4) that irradiates the light for measurement, the transmitted light L1 emitted from the chromaticity measurement light source 3 and transmitted through the liquid sample, and It is provided with a light detector 5 for detecting scattered light L2 emitted from a light source 4 for measuring turbidity and scattered by a liquid sample.
  • the light intensity signal which is the output from the photodetector 5, is output to the calculation unit 6, and the calculation unit 6 calculates the chromaticity and turbidity of the liquid sample.
  • the chromaticity and turbidity calculated by the calculation unit 6 are displayed on the display unit 7.
  • a control unit 11 that controls the operation of each of these components may be further provided.
  • the calculation unit 6 and / or the control unit 11 is configured by using, for example, a computer having a CPU, a memory, an input / output interface, an AD converter, and the like.
  • the cell 2 has a storage space 2S for storing the liquid sample inside, and has an introduction port P1 for introducing the liquid sample into the storage space 2S and an outlet P2 for leading out the liquid sample from the storage space 2S. It is equipped with.
  • the cell 2 has, for example, a flat outer shape that forms a substantially flat plate-shaped storage space 2S inside.
  • the introduction port P1 is formed at the lower end of the cell 2 and introduces the liquid sample from the lower end of the storage space 2S.
  • the outlet P2 is formed at the upper end of the cell 2 and leads out the liquid sample from the upper end of the storage space 2S.
  • the introduction port P1 opens upward toward the center of the lower end of the cell 2, and the outlet P2 opens sideways directly above the introduction port P1, but the present invention is not limited to this. ..
  • the upper surface of the cell 2 in the portion where the outlet P2 is formed is gradually cut up toward the outlet of the outlet P2.
  • the chromaticity measurement light source 3 is provided in the cell 2 and emits light in a wavelength band (light for chromaticity measurement) that is easily absorbed by the liquid sample contained in the cell 2.
  • the chromaticity measuring light source 3 emits light having a wavelength band of 200 nm or more and 400 nm or less, for example.
  • an LED that emits light having a wavelength of 375 nm is used.
  • the turbidity measurement light source 4 is provided in the cell 2 and emits light in a wavelength band (light for turbidity measurement) that is easily scattered by the liquid sample contained in the cell 2.
  • the turbidity measuring light source 4 emits light having a wavelength of, for example, 600 nm or more and 900 nm or less, more preferably 830 nm or more and 890 nm or less.
  • an LED that emits light having a wavelength of 870 nm is used.
  • the photodetector 5 is provided in the cell 2 and constitutes a turbidity measurement optical system together with the turbidity measurement light source 3 and also constitutes a turbidity measurement optical system together with the turbidity measurement light source 4. Specifically, as shown in FIG. 2, the light detector 5 detects the transmitted light L1 emitted from the chromaticity measuring light source 3 and transmitted through the liquid sample in the storage space 2S, and also detects the turbidity measuring light source 4. The scattered light L2 emitted from the light source and scattered by the liquid sample in the storage space 2S is detected.
  • the light detector 5 is a transmitted light L1 of light for turbidity measurement and a light source for turbidity measurement.
  • the scattered light L2 of the light is detected alternately.
  • the photodetector 5 can be configured using, for example, a photodiode.
  • the chromaticity turbidity measuring device 1 is provided in the cell 2 as a chromaticity measuring optical system, and reflects the light emitted from the chromaticity measuring light source 3 to the light detector 5. It further includes a guiding reflection mirror 8.
  • the chromaticity measuring light source 3 and the photodetector 5 are provided on the same side (left side in FIG. 2) in the cell 2. Specifically, the chromaticity measuring light source 3 and the light detector 5 are provided on the left wall portion of the cell 2, and the chromaticity measuring light source 3 is for chromaticity measuring along the longitudinal direction of the storage space 2S. The light detector 5 is arranged above the chromaticity measuring light source 3 so as to irradiate the light of the above.
  • the cell 2 is formed with an introduction hole H1 for introducing the light for chromaticity measurement from the chromaticity measurement light source 3 into the storage space 2S, and the light detector 5 is the light for chromaticity measurement.
  • a detection hole H2 for detecting the transmitted light L1 and the scattered light L2 of the light for measuring the turbidity is formed.
  • the reflection mirror 8 is provided on the opposite side (right side in FIG. 2) of the chromaticity measurement light source 3 so as to face the chromaticity measurement light source 3 in the cell 2. Specifically, the reflection mirror 8 is provided on the right side wall portion of the cell 2 so as to be exposed on the inner surface of the storage space 2S. Here, the reflection mirror 8 is arranged at an angle at which the light for chromaticity measurement is directed toward the light detector 5, and the light for chromaticity measurement reflected by the reflection mirror 8 is the length of the storage space 2S. After passing along the direction, it is detected by the light detector 5.
  • an optical path LP for chromaticity measurement is formed between the chromaticity measurement light source 3 and the photodetector 5.
  • the optical path LP for chromaticity measurement includes an optical path LP1 before reflection (optical path LP1 before reflection) from the light source 3 for chromaticity measurement to the reflection mirror 8 and an optical path LP2 after reflection from the reflection mirror 8 to the light detector 5. It consists of an optical path LP2) after reflection.
  • the light source 4 for turbidity measures emits light for turbidity measurement toward the after-reflection optical path LP2 of the light for turbidity measurement so as to intersect the post-reflection optical path LP2 at a predetermined angle ( ⁇ ). It is arranged like this. In this embodiment, ⁇ is 90 degrees.
  • the turbidity measurement light source 4 is arranged on the back-reflection optical path LP2 side in the cell 2.
  • the turbidity measurement light source 4 emits light along a plane formed by the pre-reflection optical path LP1 and the post-reflection optical path LP2. More specifically, it is provided on the upper wall portion of the cell 2.
  • An introduction hole H3 for introducing light for turbidity measurement from the turbidity measurement light source 4 into the storage space 2S is formed in the upper wall portion of the cell 2.
  • the detection axis of the photodetector 5 and the optical axis of the turbidity measurement light source 4 intersect (orthogonally) at a predetermined angle ( ⁇ ). Further, the optical axis of the 90-degree scattered light L2 for turbidity measurement and the detection axis of the photodetector 5 (after-reflection optical path LP2) coincide with each other.
  • the turbidity measurement light source 4 and the photodetector 5 are arranged so as to sandwich the outlet P2.
  • a protrusion 2T is formed between the outlet P2 and the turbidity measurement light source 4.
  • the protrusion 2T is formed by projecting the inner surface forming the storage space 2S inward.
  • the protrusion 2T of the present embodiment is provided so as to project downward from the upper surface of the storage space 2S, and is entirely formed of a curved surface.
  • the surface facing the surface to which the turbidity measurement light source 4 is attached does not reflect the light emitted from the turbidity measurement light source 4 toward the photodetector 5. It is configured in.
  • the surface facing the surface to which the turbidity measurement light source 4 is attached corresponds to the bottom surface of the storage space 2S. Therefore, in the present embodiment, the bottom surface is set to an angle and shape that does not reflect the light from the turbidity measurement light source 4 toward the photodetector 5.
  • the light reflected from the bottom surface formed in this way is directed toward the chromaticity measurement light source or the turbidity measurement light source, so that the light from the turbidity measurement light source with respect to the bottom surface is directed.
  • the incident angle is set to a predetermined angle.
  • the removal mechanism 9 for removing the deposits and the like may be further provided.
  • the removal mechanism 9 includes, for example, a wiper 91 and a drive unit 92 for driving the wiper 91, as shown in FIG.
  • the wiper 91 includes, for example, an introduction hole (H1, H3), a window that separates the detection hole H2 from the inside of the storage space 2S, and an elastic member that comes into contact with the surface of the reflection mirror 8 on the sample solution side and wipes them off. Is.
  • the wiper 91 has a shape that follows the internal shape of the storage space 2S, for example, and is arranged on one end side of the storage space 2S as shown in FIG. It is configured to move in the front-rear direction in FIG. 3 to the other end along the inner surface of the storage space 2S by the power transmitted from 92.
  • the cell 2 is miniaturized because it is provided with a mirror that reflects the light from the light source in the cell 2 and guides it to the photodetector 5.
  • the chromaticity of purified water such as tap water can be measured with high accuracy.
  • the light source 4 for turbidity measurement is arranged on the post-reflection optical path LP2 side so as to be adjacent to the light detector 5, and is directed toward the post-reflection optical path LP2 of the light for chromaticity measurement with respect to the post-reflection optical path LP2. It is designed to be ejected at right angles. Therefore, when the light detector 5 detects the 90-degree scattered light L2 of the light for turbidity measurement, the distance from the turbidity measurement light source 4 to the turbidity measurement point on the reflected light path LP2 and the turbidity measurement point. The distance from the light detector 5 to the light detector 5 can be shortened.
  • the light for turbidity measurement is possible to prevent the light for turbidity measurement from being attenuated by the time it reaches the turbidity measurement point.
  • the light scattered by the liquid sample at the turbidity measurement point can be captured by the photodetector 5 before it is attenuated. Further, since the scattered light enters the photodetector 5 before it spreads in each direction at the turbidity measurement point, more light can be detected by the photodetector 5. As a result, the turbidity of the liquid sample can be measured accurately.
  • the outlet P2 is formed at the upper end of the storage space 2S and the upper surface of the cell 2 in the portion where the outlet P2 is formed is gradually cut up toward the outlet of the outlet P2, it can be used as a liquid sample. Even if bubbles are contained, the bubbles are easily discharged to the outside of the storage space 2S.
  • the chromaticity measuring light source 3 emits light along the longitudinal direction of the storage space 2S, and the reflection mirror 8 reflects the light from the chromaticity measuring light source 3 along the longitudinal direction. Since it is guided to the light detector 5, the optical path LP for measuring the chromaticity can be made as long as possible.
  • the chromaticity measuring light source 3, the light detector 5, and the turbidity measuring light source 4 are all provided in the cell 2, the chromaticity measuring light source 3, the light detector 5, and the turbidity measuring light source 4 for the cell 2 are provided. It is possible to save the trouble of adjusting the positional relationship of. Further, for example, when the chromaticity turbidity measuring device 1 is attached to the water quality analysis system, the attachment work can be simplified.
  • the chromaticity measuring light source 3, the photodetector 5, and the turbidity measuring light source 4 can be arranged side by side on the same surface, it is easy to use them side by side with other measuring devices while eliminating wasted space as much as possible. ..
  • the protrusion 2T is formed between the turbidity measuring light source 4 and the photodetector 5, it is possible to prevent the light emitted from the turbidity measuring light source 4 from directly incident on the photodetector 5.
  • the accuracy of turbidity measurement can be improved. Since the protrusion 2T is provided between the outlet P2 and the turbidity measurement light source 4, even if bubbles are accumulated in the outlet P2, the light from the turbidity measurement light source 4 hits the bubbles. It is possible to further reduce noise in turbidity measurement and turbidity measurement by suppressing scattering. Since the protrusion 2T is entirely formed of a curved surface, it is possible to suppress the formation of corners and suppress noise in chromaticity measurement and turbidity measurement due to light reflection at the corners. Can be done.
  • the bottom surface of the storage space 2S which is a surface facing the turbidity measurement light source 4, has an angle and shape that does not reflect the light emitted from the turbidity measurement light source 4 toward the light detector 5, and is at the bottom surface. Since the incident angle of the light from the turbidity measurement light source with respect to the bottom surface is set to a predetermined angle so that the reflected light is directed toward the chromaticity measurement light source or the turbidity measurement light source, the bottom surface determines. It is possible to suppress the reflected light from the turbidity measuring light source 4 from being detected by the light detector 5 and suppress the adverse effect on the turbidity measurement.
  • the present invention is not limited to the above-described embodiment.
  • a condenser lens is provided between the turbidity measurement light source and the storage space, the light emitted from the turbidity measurement light source can be condensed on the reflected optical path LP2.
  • the light from the turbidity measurement light source can be prevented from being directly detected by the photodetector as in the case where the protrusion is provided.
  • the measurement accuracy of turbidity can be improved without forming protrusions.
  • the photodetector is provided above the light source for chromaticity measurement, but the light source for chromaticity measurement may be arranged above the photodetector, or depending on the shape of the cell or the storage space. May arrange the photodetector beside the light source for chromaticity measurement.
  • the position of the reflection mirror may be any position as long as it can reflect the light from the chromaticity measurement light source toward the photodetector, and may be appropriately changed accordingly.
  • the arrangement of the light source for turbidity measurement may be appropriately changed as long as it is on the post-reflection optical path side and can irradiate light perpendicular to the post-reflection optical path LP2.
  • the turbidity measurement light source is arranged on the post-reflection light path side because the distance between the turbidity measurement light source and the light detector can be shortened.
  • the turbidity measurement light source is arranged on the pre-reflection light path side. It is quite possible to measure turbidity.
  • the light source for chromaticity measurement, the light source for turbidity measurement, and the photodetector do not necessarily have to be provided in the cell, and these may be arranged separately from the cell.
  • the method of measuring the chromaticity of the liquid sample by measuring the transmitted light transmitted through the liquid sample has been described, but the present invention is not limited to this, and for example, the wavelength of the light source for measuring transmitted light may be changed. For example, it is also possible to measure the turbidity of a liquid sample by measuring the transmitted light.
  • the light source for measuring the scattered light turbidity has been described as having a 90-degree scattering method in which the light for measuring the scattered light turbidity is emitted so as to be orthogonal to the light path after reflection.
  • a predetermined angle ⁇ determined based on the water quality standards of each country may be adopted, for example, 60 degrees, 120 degrees, 150 degrees, or the like.
  • the water quality analysis system is not limited to the one located at the end of the water supply pipe, for example. It may be arranged at the end of the water purification plant, or may be provided in a flow path or the like before or during purification at the water purification plant. It may be used for monitoring various water qualities such as river water, seawater, and factory wastewater.
  • the chromaticity turbidity measuring device does not necessarily have to be used in combination with other measuring devices, and can be used alone. As long as it does not contradict the gist of the present invention, various modifications and combinations of embodiments may be performed.

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PCT/JP2021/015336 2020-05-15 2021-04-13 光学測定装置及び水質分析システム Ceased WO2021229980A1 (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP21804026.9A EP4137814B1 (en) 2020-05-15 2021-04-13 Optical measurement device and water quality analysis system
JP2022522571A JP7559061B2 (ja) 2020-05-15 2021-04-13 光学測定装置及び水質分析システム
CN202180033072.4A CN115552220A (zh) 2020-05-15 2021-04-13 光学测定装置以及水质分析系统
US17/997,805 US12265028B2 (en) 2020-05-15 2021-04-13 Optical measurement device and water quality analysis system
KR1020227038500A KR102928240B1 (ko) 2020-05-15 2021-04-13 광학 측정 장치 및 수질 분석 시스템

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JP2020-086213 2020-05-15
JP2020086213 2020-05-15

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EP4137814A1 (en) 2023-02-22
CN115552220A (zh) 2022-12-30
US20230288332A1 (en) 2023-09-14
KR20230011281A (ko) 2023-01-20
EP4137814A4 (en) 2024-05-15
JPWO2021229980A1 (https=) 2021-11-18
EP4137814B1 (en) 2024-10-30
JP7559061B2 (ja) 2024-10-01
US12265028B2 (en) 2025-04-01
KR102928240B1 (ko) 2026-02-19

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