Precise turbidity measurement method and system, using a speckling pattern
Patent Information
- Application Number
- ES2022820455T
- Authority / Receiving Office
- ES · ES
- Patent Type
- Patents
- Current Assignee / Owner
- Priority Date
- 2021-06-08
- Filing Date
- 2022-05-30
- Publication Date
- 2026-08-31
- Estimated Expiration
- 2042-05-30
Smart Images
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Abstract
Description
Precise turbidity measurement method and system, using a speckling pattern Technical field The present invention relates to a precise turbidity measurement method and system using a speckling pattern and, more particularly, to a precise turbidity measurement method and system using a speckling pattern, in which a speckling pattern can be used for turbidity measurement, thereby enabling the measurement of turbidity and bacterial or microbial contamination with high precision. Background In general, a conventional turbidity sensor applied to a washing machine or similar uses a phenomenon of light occlusion by foreign matter contained in the wash water in a wash tank, and a simple optical sensor is used in which the light emitted by a light emission sensor and passing through the wash water is received by a light reception sensor and a luminance signal of the received light, i.e., the intensity of the light, is measured and converted into a turbidity value. However, the turbidity measurement method using such an optical sensor is unable to accurately measure the intensity of light—that is, the microlight intensity—due to irregular variations in brightness caused by the position and uneven trajectory of the foreign matter. Consequently, it becomes difficult to determine precisely whether the washed laundry has been sufficiently cleaned, leading to the unnecessary use of more water than required. Furthermore, the turbidity measurement method using the conventional optical sensor can only measure macroturbidity, but it has problems in not being able to detect biological contamination caused by bacteria or microorganisms present, for example, in washed clothes. Meanwhile, in recent years a speckling detection method has been developed and used to detect contamination caused by bacteria or microorganisms grown in a medium in a non-contact manner, in which, by using laser light generated by a laser source, a camera photographs a speckling pattern of the culture medium due to multiple scattering by bacteria or microorganisms. However, the speckling detection method can measure biological contamination with high accuracy in relatively low concentration samples, but it cannot measure biological contamination in relatively high concentration samples, such as wash water, because it exceeds the measurement range. Documents WO 2020 / 153649 A1 and EP 0899548 B1 disclose relevant systems for measuring mottling patterns. Detailed description of the invention Technical problem An objective of the present invention is to provide a precise turbidity measurement method and system that enables the accurate calculation of the microturbidity of a sample, such as the wash water from a washing machine, by using an optical dilution member capable of optically diluting a speckled concentration in the sample, thereby saving wash water from the washing machine or significantly improving the performance of the washing machine, and also enabling the measurement of biological contamination of the sample caused by bacteria or microorganisms, notably improving the performance of washing machines and other electronic products that require turbidity measurement. However, the foregoing objective is merely illustrative and does not limit the scope of the present invention. Technical solution According to one aspect of the present invention to achieve the above objective, a precise turbidity measuring system according to claim 1 is provided using a speckled pattern, the system includes: a measuring vessel having a light inlet portion formed on one side thereof to enable the introduction of laser light, having a light scattering space formed therein to enable multiple reflection or multiple scattering of the laser light through multiple paths, and having a light outlet portion formed on the other side thereof to enable the measurement of microturbidity or bacterial or microbial contamination by using a speckled pattern generated in the light scattering space;and an optical dilution member that is formed in at least a portion of the light scattering space, has a sample receiving portion formed on one side thereof as to receive a sample being measured, and comprises an optical dilution means having the function of optically diluting a speckling pattern of the sample as to enable the measurement of microturbidity of the sample. Furthermore, according to the present invention, the measuring container may have a general cylindrical shape made of at least metal, glass, synthetic resin and combinations thereof, in which dispersion protrusions or dispersion layers are formed on an inner surface. Furthermore, according to the present invention, in the measuring vessel, a first height of the light inlet portion and a second height of the light outlet portion may differ from each other in such a way that a principal light emission axis of a laser source configured to generate laser light is deviated from a principal light reception axis of a first chamber configured to measure the speckle pattern, or a first eccentric position of the light inlet portion and a second eccentric position of the light outlet portion may differ from each other. Furthermore, according to the present invention, the optical dilution member can be a pure light transmitting body from which optical foreign matter or biological contamination is completely or almost completely removed, so that no mottling pattern is produced in it. Furthermore, according to the present invention, the optical dilution member may have a general circular cylindrical shape in which at least a portion of the sample receiving part is installed on a central axis of the measuring vessel, such that the optical dilution member may be formed in a shape that sufficiently encompasses the sample. Furthermore, according to the present invention, the system also includes a laser source configured to emit laser light toward the light-inlet portion. Likewise, according to the present invention, the system also includes a first camera configured to photograph a speckled pattern from the light-outlet portion. Also, according to the present invention, the system further includes a mottle pattern variation calculation part configured to measure a variation over time of the mottle pattern using video information received from the first camera. Furthermore, according to the present invention, the measuring vessel may have an optical hole formed in a portion corresponding to a main light emission axis line of the laser source passing through the sample, and the system may further include a second camera configured to photograph the brightness of the optical hole and a macroturbidity calculation part configured to calculate the macroturbidity using the brightness information received from the second camera. Furthermore, according to the present invention, the mottling pattern variation calculation portion calculates a microturbidity value proportionally by multiplying an actual measured turbidity value obtained from an actual measured variation of the mottling pattern by a multiple of the optical dilution member area based on the sample area. According to one aspect of the present invention, to achieve the foregoing objective, a precise turbidity measurement method is provided according to claim 7 using a speckled pattern. The method includes: (a) emitting laser light into a measuring vessel through a light inlet portion; (b) enabling multiple reflection or multiple scattering of the laser light through multiple paths using a light scattering space of the measuring vessel such that a portion of the laser light passes through the sample and exhibits a speckled pattern and another portion of the laser light passes through an optical dilution medium that optically dilutes the speckled pattern of the sample; and (c) measuring the microturbidity or bacterial or microbial contamination of the sample by measuring the optically diluted speckled pattern of the sample through the light outlet portion of the measuring vessel. Furthermore, according to the present invention, in operation (c), a microturbidity value is calculated proportionally by multiplying an actual measured turbidity value obtained from an actual measured variation of the speckling pattern by a multiple of the area of the optical dilution member based on the sample area. Furthermore, according to the present invention, the method may include, after operation (b), (d) the calculation of macroturbidity by measuring the brightness of the laser light that has passed through the sample via an optical path of the measuring vessel. Effect of the invention According to an embodiment of the present invention as described above, by using an optical dilution member capable of optically diluting the speckling concentration of a sample, it is possible to accurately calculate the microturbidity of a sample, such as wash water from a washing machine, thereby saving wash water from the washing machine or significantly improving the performance of the washing machine. Furthermore, it is possible to measure the biological contamination of the sample caused by bacteria or microorganisms, thereby considerably improving the performance, accuracy, and reliability of washing machines and other electronic products that require turbidity measurement. However, the aforementioned effects do not limit the scope of the present invention. Brief description of the drawings Figure 1 is a cross-sectional side view conceptually illustrating a precise turbidity measurement system using a speckled pattern according to some embodiments of the present invention. Figure 2 is a cross-sectional side view conceptually illustrating a precise turbidity measurement system using a speckled pattern according to other embodiments of the present invention. Figure 3 is a cross-sectional plan view conceptually illustrating a precise turbidity measurement system using a speckled pattern according to other embodiments of the present invention. Figure 4 is a cross-sectional side view conceptually illustrating a precise turbidity measurement system using a speckled pattern according to other embodiments of the present invention.Figure 5 is a flow diagram illustrating a precise turbidity measurement method using a speckling pattern according to some embodiments of the present invention. Figure 6 is a flow diagram illustrating a precise turbidity measurement method using a speckling pattern in accordance with other embodiments of the present invention. Mode of invention The present invention will now be described in detail with regard to preferred embodiments, with reference to the accompanying drawings. However, the present invention can be implemented in various ways and should not be interpreted as being limited to the exemplary embodiments shown herein. These embodiments are provided to make this description comprehensive and complete, and to fully convey the scope of the inventive concept to a person skilled in the art. The dimensions of the components in the drawings may be exaggerated for ease of explanation. Figure 1 is a cross-sectional side view that conceptually illustrates a precise turbidity measuring system 100 that uses a speckling pattern according to some embodiments of the present invention. First, as shown in Figure 1, the precise turbidity measuring system 100 using a speckling pattern according to some embodiments of the present invention may largely include a measuring vessel 10 and an optical dilution member 20. For example, the measuring container 10 can generally be in the form of a hollow cylinder, a polygonal cylinder, or a tube, and can be in the form of a multiple scattering waveguide having a light scattering space formed inside it such as to enable multiple reflection or multiple scattering of laser light L through multiple paths. Furthermore, for example, the measuring container 10 may have a general cylindrical shape made of at least metal, glass, synthetic resin and combinations thereof, in which dispersion protrusions T or dispersion layers are formed on the inner surface so that the multiple dispersion phenomenon can occur sufficiently in it. The measuring vessel 10 may have a light inlet portion 11 formed on one side thereof to enable the introduction of laser light L, and a light outlet portion 12 formed on the other side thereof to enable the measurement of microturbidity or bacterial or microbial contamination by means of a speckled pattern generated in the light scattering space. More specifically, for example, as shown in Figure 1, in the measuring vessel 10, a first height H1 of the light inlet part 11 and a second height H2 of the light outlet part 12 can differ from each other in such a way that a principal light emission axis of a laser source 30 configured to generate laser light L is deviated from a principal light reception axis of a first chamber C1 configured to measure the speckle pattern as to block direct light and actively induce light scattering. Although the drawing illustrates that the first height H1 is higher and the second height H2 is lower, the opposite is also possible, and other types of heights can be applied. Therefore, as shown in Figure 1, when laser light L is introduced through the light inlet part 11, sufficient multiple reflection and multiple scattering occurs due to the scattering protrusions T or scattering layers in the light scattering space and can be amplified as a variation over time according to minute movements due to internal foreign matter, bacteria, or microorganisms, i.e., a general speckling pattern, and the speckling pattern can be measured through the light outlet part 12. On the other hand, for example, as shown in Figure 1, the optical dilution member 20 may have a sample housing portion 1 21 formed in at least a portion of the light scattering space and configured to house a sample, which is an object to be measured, on one side, and may consist of an optical dilution means that serves to optically dilute a speckle pattern of the sample 1 so as to allow a portion of the laser light L to pass through the sample 1 and exhibit the speckle pattern, and to allow another portion of the laser light L to optically dilute the speckle pattern, enabling the measurement of microturbidity of the sample 1. More specifically, for example, optical dilution member 20 can be applied to a pure light transmitting body, such as pure glass, pure crystal, pure ceramic, pure acrylic, etc., from which optical foreign matter or biological contamination is totally or almost completely removed, so that no mottled pattern occurs on it. The optical dilution member 20 may have a general circular cylindrical shape in which at least a portion of the sample receiving part 21 is installed on a central axis of the measuring vessel 10, such that the optical dilution member 20 can be formed so as to sufficiently encompass the sample 1. Therefore, for example, if 1 liter of sample 1 with a turbidity of 40 is placed in a container holding 99 liters of optical dilution member 20 with a turbidity of 1 and then irradiated with laser light L, it would be optically equivalent to irradiating a 100-liter solution with laser light, which is a mixture of 1 liter of sample 1 with a turbidity of 40 and 99 liters of optical dilution member 20 with a turbidity of 1. In other words, sample 1 with a turbidity of 41 can be diluted to a sample 1 with a turbidity of 0.41 divided by a total volume of 100 liters. Ultimately, even for wash water contaminated with a turbidity of 40, the use of such an optical method can offer the same result as measuring a solution with a turbidity of 0.41 with laser light L. Therefore, it is possible to determine turbidity microscopically, such as determining a turbidity of 0.4 for a turbidity of 40, a turbidity of 0.5 for a turbidity of 50, and so on. Furthermore, for example, as shown in Figure 1, the precise turbidity measuring system 100 using a speckle pattern according to the present invention further includes a laser source 30 configured to emit laser light L to the light inlet portion 11, a first camera C1 configured to photograph a speckle pattern from the light outlet portion 12, and a speckle pattern variation calculation portion 40 configured to measure a variation over time of the speckle pattern using video information received from the first camera C1. Here, the mottle pattern variation calculation part 40 calculates a microturbidity value proportionally by multiplying an actual measured turbidity value obtained from the actual measured variation of the mottle pattern by a multiple of the optical dilution member area based on the sample area. More specifically, for example, the part of calculating the variation of the speckling pattern 40 can use a non-contact speckling detection method in which laser light L is emitted to sample 1 and a speckling pattern generated due to multiple scattering is detected for sample 1, and the principle of a chaotic wave sensor can be applied. For example, according to the principle of a chaotic wave sensor, in the case of a material with a homogeneous internal refractive index, such as glass, refraction occurs in a certain direction when coherent light is radiated onto it. However, when coherent light, such as laser light, is radiated onto an object that has a heterogeneous internal refractive index or is made up of fine refractive or scattering protrusions, a very complex multiple scattering occurs within the material. Some of the light rays that have been scattered along complex paths due to multiple scattering pass through sample 1, which is a test target. The light rays passing through multiple points on the test target generate either constructive or destructive interference, and the constructive / destructive interference of the light rays creates grain patterns (specks). Light rays scattered along complicated paths are called "chaotic waves," and chaotic waves can be detected through specks of coherent light, and in the case that the coherent light is laser light, the specks of coherent light can be detected through laser specks. When a stable medium is irradiated with coherent light, that is, when a stable medium, in which an internal component does not move, is irradiated with coherent light (e.g., laser light), a stable mottled pattern without variation can be observed. However, when an unstable medium with a moving internal component, such as bacteria, is included, the mottled pattern changes. In other words, due to the microscopic biological activities of microorganisms (e.g., intracellular movement, movement of microorganisms, etc.), an optical path can vary slightly over time. Since the speckling pattern is generated by light interference, a small change in the optical path can cause variations in the speckling pattern. Consequently, when the temporal variation of the speckling pattern is measured, the biological activities of microorganisms can be rapidly assessed. Thus, by measuring the variation of the speckling pattern over time, the presence or absence of microorganisms and their concentration, as well as the different types of microorganisms, can be identified. The test target described in this specification is sample 1, such as wash water or similar, and a configuration for measuring the variation in the speckling pattern of sample 1 can be defined as a chaotic wave sensor. In this case, the chaotic wave sensor can be configured in various types, such as a reflective type and a transmissive type, and an optical system can be configured in an encapsulated type. Furthermore, the laser source 30 can use laser light with good coherence as its light source. However, in addition to the laser light source, a light source with improved coherence can be used by incorporating a filter that only passes a specific wavelength from a particular band, or a specific wavelength within a general light source. Alternatively, the measurement can be performed using a wavelength (e.g., infrared, ultraviolet, etc.) outside the visible light range. Furthermore, the first C1 camera, a photographic device for capturing images, and various image sensors can be applied. By irradiating sample 1 with coherent light, a coherent light speckling pattern can be formed by multiple scattering. If sample 1 contains viruses, bacteria, microorganisms, etc., the presence or absence of bacteria and microorganisms, as well as their concentration on the target test object, can be quickly determined based on a pattern of coherent light specks that varies over time. For example, by irradiating the test target with coherent light at regular intervals at each reference time, a coherent light speckle pattern can be formed on the test target. Photographing the test target, where multiple scattering occurs, with a camera or similar device can generate a coherent light speckle image of the resulting speckle pattern. In this case, a camera with a two-dimensional image sensor or a one-dimensional optical sensor can be used to measure the speckle pattern from several generated images. For example, a camera equipped with an imaging device, such as a charge-coupled device (CCD), can be used as the measurement unit. Therefore, the presence of bacteria and microorganisms in sample 1 can be determined non-invasively from photographed coherent light speckle images by checking whether the coherent light speckles change over time. For example, if there is no activity in sample 1, the coherent light speckles will exhibit a constant interference pattern over time. That is, if there is no activity, a constant interference pattern of coherent light speckles can be found in the images of the coherent light speckles measured at each reference time. As such, when the coherent light speckle images show no variation, or very little variation, in the interference pattern over time, it can be determined that there are no bacteria or microorganisms in sample 1. On the other hand, when the pattern of coherent light speckles changes, it can be determined that bacteria and microorganisms are present in sample 1. That is, when bacteria and microorganisms are present in sample 1, they can multiply over time and move continuously. This movement of the bacteria or microorganisms can cause the continuous change in the laser speckle pattern over time. Consequently, when the pattern of coherent light speckles has changed to a degree greater than or equal to a predetermined error range in the coherent light speckle images measured at each reference time, it can be determined that bacteria and microorganisms are present in sample 1. In this case, the degree of change in the pattern of coherent light specks can be determined according to the concentration of bacteria and microorganisms. Therefore, the concentration of bacteria and microorganisms can be measured using time correlation analysis. For example, the standard deviation of the light intensity of the coherent light specks can be used to measure the degree of change in the pattern of the coherent light specks. Therefore, when laser light L generated by laser source 30 is made to enter through light entrance part 11, sufficient multiple reflection and multiple scattering occurs by the scattering protrusions T or scattering layers in the light scattering space and can be amplified as a variation over time according to minute movements due to internal foreign matter, bacteria, or microorganisms, i.e., a general mottled pattern. At this point, the use of the optical dilution member 20 can allow a portion of the laser light L to pass through the sample 1 and exhibit a speckled pattern and allow another portion of the laser light L to optically dilute the speckled pattern of the sample 1, and then the speckled pattern can be made to exit through the light output part 12, which can be photographed by the first camera C1 in the form of a time-lapse video, and the speckled pattern variation calculation part 40 can measure a variation over time of the speckled pattern to more accurately calculate the microturbidity or bacterial or microbial contamination. Here, microturbidity and biological contamination can be measured in a non-fluid state of sample 1, but are not necessarily limited to it, such that microturbidity and biological contamination can be measured even in a fluid state. Furthermore, here, "microturbidity" does not imply a narrow overall measurement range between the upper and lower limits. That is, microturbidity refers to a measurement method that has a very wide measurement range but is capable of accurately measuring turbidity at very low levels, such as levels of several tens, several units, or even decimal units. Therefore, while the conventional turbidity measurement method using an optical sensor only measures and distinguishes macro-turbidity, such as 10, 1000, etc., the present invention allows the turbidity of sample 1, such as wash water from a washing machine, to be accurately measured and distinguished at a microscopic level, such as 41, 43, 43, or 44, by using the optical dilution member 20. This member is capable of optically diluting the optical concentration of sample 1, overcoming the limitation of the speckling detection device, which cannot detect turbidity due to saturation of its detection capacity, even if the turbidity exceeds approximately 20. As a result, it is possible to precisely stop washing at a turbidity of 45, which is the optimum turbidity of the wash water, thereby saving wash water from the washing machines or significantly improving their performance.In addition, biological contamination of the sample caused by bacteria or microorganisms can be measured, which considerably improves the performance, accuracy, and reliability of washing machines and other electronic products that require turbidity measurement. Figure 2 is a cross-sectional side view conceptually illustrating a precise turbidity measurement system 200 using a speckled pattern according to other embodiments of the present invention. As shown in Figure 2, in the precise turbidity measurement system 200 using a speckled pattern according to other embodiments of the present invention, the measuring vessel 10 can be in the form of an outer tube, and the optical dilution member 20 can be in the form of an inner tube, such that the microturbidity and biological contamination of sample 1 can be measured even while sample 1 is flowing. Figure 3 is a cross-sectional plan view that conceptually illustrates a precise turbidity measuring system 300 using a speckled pattern according to other embodiments of the present invention. As shown in Figure 3, the precise turbidity measuring system 300 using a speckled pattern according to other embodiments of the present invention, when viewed in a plan view, may have a first eccentric position P1 of the light inlet portion 11 and a second eccentric position P2 of the light outlet portion 12 differ from each other in such a way as to block direct light and actively induce light scattering. Therefore, as shown in Figure 3, the use of the optical dilution member 20 can allow a portion of the laser light L to pass through the sample 1 and display a speckled pattern and can allow another portion of the laser light L to optically dilute the speckled pattern of the sample 1, which can then be made to exit through the light output portion 12. Figure 4 is a cross-sectional side view conceptually illustrating a precise turbidity measuring system 400 that uses a speckled pattern according to other embodiments of the present invention. As shown in Figure 4, a measuring vessel 10 of the precise turbidity measuring system 400 that uses a speckled pattern according to other embodiments of the present invention may have an optical orifice 13 formed in a portion corresponding to the main light emission axis line of the laser source 30 passing through the sample 1. Furthermore, the precise turbidity measuring system 400 using a speckling pattern according to other embodiments of the present invention may include a second camera C2 configured to photograph the brightness of the optical orifice 13 and a macroturbidity calculation part 50 configured to calculate a macroturbidity using the brightness information received from the second camera C2. Therefore, the first camera C1 can photograph the speckled pattern emitted through the light output section 12 as a time-lapse video, and the speckled pattern variation calculation section 40 can measure the variation of the speckled pattern over time to more accurately calculate microturbidity or bacterial / microbial contamination. Simultaneously, the second camera C2 can photograph the optical brightness emitted through the optical aperture 13 as a snapshot image, and the macroturbidity calculation section 50 can calculate the macroturbidity. Therefore, according to the present invention, it is possible to simultaneously measure macroturbidity and microturbidity, and to mutually verify or use the measured values in a complementary manner. Here, the first camera C1 can be a camera capable of recording a video to measure a variation over time of a speckling pattern, and the second camera C2 can be a type of photosensor capable of measuring optical brightness, i.e., the intensity of light. Figure 5 is a flow diagram illustrating a precise turbidity measurement method using a speckling pattern according to some embodiments of the present invention. As shown in Figures 1 to 5, an accurate turbidity measurement method using a speckle pattern, according to some embodiments, may include: (a) emitting laser light L into the measuring vessel 10 through the light inlet portion 11; (b) enabling multiple reflection or multiple scattering of the laser light L through multiple paths using a light scattering space of the measuring vessel 10, such that a portion of the laser light L passes through the sample 1 and exhibits a speckle pattern, and another portion of the laser light L passes through an optical dilution medium that optically dilutes the speckle pattern of the sample 1; and (c) measuring the microturbidity or bacterial or microbial contamination of the sample 1 by measuring the optically diluted speckle pattern of the sample 1 through the light outlet portion 12 of the measuring vessel 10. Here, in operation (c), a microturbidity value is calculated proportionally by multiplying an actual measured turbidity value obtained from an actual measured variation of the speckling pattern by a multiple of the optical dilution member area based on the sample area. Figure 6 is a flow diagram illustrating a precise turbidity measurement method using a speckling pattern in accordance with other embodiments of the present invention. As shown in Figures 1 to 6, an accurate turbidity measurement method using a speckle pattern according to some embodiments may include: (a) emitting laser light L into the measuring vessel 10 through the light inlet portion 11; (b) enabling multiple reflection or multiple scattering of the laser light L through multiple paths using a light scattering space of the measuring vessel 10 such that a portion of the laser light L passes through the sample 1 and exhibits a speckle pattern and another portion of the laser light L passes through an optical dilution medium that optically dilutes the speckle pattern of the sample 1; (c) measuring the microturbidity or bacterial or microbial contamination of the sample 1 by measuring the optically diluted speckle pattern of the sample 1 through the light outlet portion 12 of the measuring vessel 10;and after (b) (d) calculating the macroturbidity by measuring the brightness of the laser light L that has passed through sample 1 through the optical path 13 of the measuring vessel 10.; Although the present invention has been described in relation to the exemplary embodiment shown in the drawings, this is merely illustrative. Those skilled in the art will understand that various modifications and equivalents can be made without leaving the scope of the invention. Therefore, the scope of the present invention is defined solely by the appended claims.
Claims
1. A precise turbidity measurement system (100; 200; 300; 400) using a speckled pattern, the system (100; 200; 300; 400) comprising: a measuring vessel (10) having a light inlet portion (11) formed on one side thereof to enable the introduction of laser light (L), having a light scattering space formed therein to enable multiple reflection or multiple scattering of the laser light (L) through multiple paths, and having a light outlet portion (12) formed on the other side thereof to enable the measurement of microturbidity or bacterial or microbial contamination by using a speckled pattern generated in the light scattering space;an optical dilution member (20) formed in at least a portion of the light scattering space, having a sample receiving portion (21) formed on one side thereof to receive a sample (1) being measured, and comprising an optical dilution means having the function of optically diluting a speckle pattern of the sample (1) so as to enable the measurement of the microturbidity of the sample (1); a laser source (30) configured to emit laser light (L) to the light inlet portion (11); a first camera (C1) configured to photograph a speckle pattern of the light outlet portion (12); and a speckle pattern variation calculation portion (40) configured to measure a time-variation of the speckle pattern using video information received from the first camera (C1);wherein the mottle pattern variation calculation portion (40) is configured to calculate a microturbidity value proportionally by multiplying an actual measured turbidity value obtained from an actual measured variation of the mottle pattern by a multiple of the area of the optical dilution member (20) based on the sample area (1).
2. The system (100; 200; 300; 400) of claim 1, wherein the measuring vessel (10) has a generally cylindrical shape made of at least metal, glass, synthetic resin, and combinations thereof, wherein dispersion protrusions (T) or dispersion layers are formed on an inner surface.
3. The system (100; 200; 300;400) of claim 1, wherein, in the measuring container (10), a first height (H1) of the light inlet portion (11) and a second height (H2) of the light outlet portion (12) differ from each other in such a way that a principal light emission axis of a laser source (30) configured to generate the laser light (L) is deviated from a principal light reception axis of a first chamber (C1) configured to measure the speckle pattern, or a first eccentric position of the light inlet portion (11) and a second eccentric position of the light outlet portion (12) differ from each other.
4. The system (100; 200; 300; 400) of claim 1, wherein the optical dilution member (20) is a pure light-transmitting body from which optical foreign matter or biological contamination is completely or almost completely removed, such that no mottling pattern is produced therein.
5. The system (100; 200; 300;400) of claim 4, wherein the optical dilution member (20) has a generally circular cylindrical shape in which at least a portion of the sample receiving portion (21) is installed on a central axis of the measuring vessel (10), such that the optical dilution member (20) can be formed with a shape that sufficiently encompasses the sample (1).
6. The system (400) of claim 1, wherein the measuring vessel (10) has an optical orifice (13) formed in a portion corresponding to a main light emission axis line of the laser source (30) passing through the sample (1), and the system (400) further comprises: a second camera (C2) configured to photograph the brightness of the optical orifice (13);and a macroturbidity calculation part (50) configured to calculate macroturbidity using brightness information received from the second chamber (C2).
7. A precise turbidity measurement method using a speckle pattern, the method comprising: (a) emitting laser light (L) into a measuring vessel (10) through a light inlet part (11); (b) enabling multiple reflection or multiple scattering of the laser light (L) through multiple paths using a light scattering space of the measuring vessel (10) such that a portion of the laser light (L) passes through a sample (1) and exhibits a speckle pattern and another portion of the laser light (L) passes through an optical dilution medium that optically dilutes the speckle pattern of the sample (1);and (c) measuring microturbidity or bacterial or microbial contamination of the sample (1) by measuring the optically diluted speckling pattern of the sample (1) through a light-exit portion (12) of the measuring vessel (10), wherein, in operation (c), a microturbidity value is calculated proportionally by multiplying an actual measured turbidity value obtained from an actual measured variation of the speckling pattern by a multiple of the area of the optical dilution member (20) based on the area of the sample (1).
8. The method of claim 7, further comprising: after operation (b), (d) calculating macroturbidity by measuring the brightness of the laser light (L) that has passed through the sample (1) via an optical path of the measuring vessel (10).