WO2002025254A1 - Dispositif de mesure de concentration - Google Patents
Dispositif de mesure de concentration Download PDFInfo
- Publication number
- WO2002025254A1 WO2002025254A1 PCT/JP2001/008222 JP0108222W WO0225254A1 WO 2002025254 A1 WO2002025254 A1 WO 2002025254A1 JP 0108222 W JP0108222 W JP 0108222W WO 0225254 A1 WO0225254 A1 WO 0225254A1
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- WIPO (PCT)
- Prior art keywords
- concentration
- optical fiber
- light
- measuring device
- concentration measuring
- Prior art date
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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
- 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
-
- 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
- G01N21/474—Details of optical heads therefor, e.g. using optical fibres
-
- 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
- G01N21/474—Details of optical heads therefor, e.g. using optical fibres
- G01N2021/4742—Details of optical heads therefor, e.g. using optical fibres comprising optical fibres
- G01N2021/4747—Concentric bundles
-
- 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
- G01N21/474—Details of optical heads therefor, e.g. using optical fibres
- G01N2021/4742—Details of optical heads therefor, e.g. using optical fibres comprising optical fibres
- G01N2021/475—Bifurcated bundle
Definitions
- the present invention relates to a device for measuring the concentration of turbid components in a liquid to be measured, such as the concentration of sludge in sewage generated from facilities such as sewage, wastewater, and human waste treatment, and the concentration of solids in treated water.
- the present invention relates to a concentration measuring device that measures the concentration of a turbid component using light by a diffuse reflection method.
- ultrasonic, infrared, and microwave concentration measurement devices in order to stabilize the output value as much as possible, measurement is usually performed in proportion to the amount of particles in the liquid to be measured. It has a structure in which the wave transmitting and receiving sections are integrated, that is, a structure in which these receiving and transmitting sections are housed in one concentration measuring device. With such an integrated structure, the size of the concentration measuring device, especially in the longitudinal direction, increases, so that not only the installation location is limited, but also the surrounding maintenance space must be designed wide. There's a problem. The problem is particularly noticeable in places where the installation space is narrow or where the installation environment is poor (for example, places with severe corrosion or bad atmosphere).
- a transmitted light method in which a laser beam is irradiated onto a liquid to be measured and the amount of laser light transmitted through the liquid to be measured is detected.
- this measurement method it is difficult to optically measure the concentration with high sensitivity, particularly when the concentration of the turbid component is 1% or more, particularly when the concentration is about 3% or more. Difficult to measure is there. This is because the color of the turbid component (eg, sludge) is often black, etc., and light is often absorbed, so that the light is greatly attenuated and high-sensitivity measurement becomes difficult. Because.
- a method of detecting the reflected light of one laser beam irradiated into the liquid to be measured is effective.
- This method is also called a diffuse reflection method because most of the laser light irradiated into the liquid to be measured impinges on the turbid component in the liquid to be measured, and is reflected after being diffused. If the diffuse reflection light is detected as described above, the influence of the color of the turbid component is less likely to be exerted, so that it is possible to measure even a liquid to be measured having a relatively high turbid component concentration.
- a light guide tip surface 10 for emitting laser light in a density detecting section is used.
- the light guide tip surface 102 for receiving light are formed relatively large (for example, about 3 mm), so that the optical light span L between them is also relatively large (for example, , About 5mm). Therefore, it is difficult to detect diffuse reflection light with a sufficient amount of light in a state of low attenuation, and it is difficult to optically enhance measurement sensitivity.
- an object of the present invention is to measure with high sensitivity up to a high turbid component concentration (for example, to a concentration of 1% or more, especially to a concentration of 3% or more) while taking advantage of the diffuse reflection method using laser light. It is to provide a possible concentration measuring device.
- an object of the present invention is to make use of the advantage of the diffuse reflection method of laser light-desirably, to solve the above-mentioned restrictions on the installation location of the concentration measuring device and the problems related to maintenance space. Yes, can measure high turbid component concentrations with high sensitivity, and can easily install a concentration detection unit that directly detects the concentration even in a narrow place or a place with bad environment.
- An object of the present invention is to provide a suitable concentration measuring device.
- a concentration measuring apparatus detects the concentration of a turbid component in a liquid to be measured by detecting diffuse reflection light of laser light emitted toward the liquid to be measured.
- the optical fiber for laser light emission and the optical fiber for light reception are bundled in a plurality to form a single concentration detecting unit.
- a relatively large number of the light emitting optical fibers and the light receiving optical fibers are bundled together. For example, 100 or more optical fibers are bundled as a total of both.
- the total number of optical fibers is determined as appropriate according to the properties and concentration range of the turbid component in the liquid to be measured for concentration measurement, the fiber diameter of one optical fiber to be used, the size of one sensor, etc. What is necessary is just to select from the range of about 100 to 500,000.
- the diameter of each optical fiber may be determined, for example, from the range of 20 to 80.
- the sensor surface diameter is usually determined mechanically because a part of the sensor is usually attached to a pipe or the like, but may be appropriately determined, for example, from a range of about 3 to 15 mm. When the diameter of each optical fiber and the size of the sensor surface are determined, the maximum number of bundled optical fibers is almost determined.
- the arrangement on the sensor surface that directly receives and emits light is important.
- This arrangement can take various forms, but as will be described in the examples described later, the characteristics are slightly different due to the concentration measurement obtained by the searched arrangement form.
- a light-emitting optical fiber 1 and a light-receiving optical fiber may be randomly arranged on one surface of the sensor of the concentration detecting unit.
- the output value of one laser beam received that is, the amount of received light is the largest in the case of this random arrangement, and this embodiment is the most preferable.
- the present invention is not limited to this random arrangement, but may be a form in which a light emitting optical fiber is arranged at the center and a light receiving optical fiber is arranged around the center of the sensor surface of the concentration detecting section.
- a light receiving optical fiber may be arranged at the center portion, and a light emitting optical fiber may be arranged around the optical fiber c. It is also possible to adopt a configuration in which a light emitting optical fiber is arranged on one half of the surface and a light receiving optical fiber is arranged on the other half.
- the laser beam supplied to the light emitting optical fiber is a laser beam supplied continuously.
- a laser light source a normal light emitting diode (LED) can be used, but a laser light emitting diode having a wavelength range suitable for laser light emission and having a high intensity in a specific wavelength range. It is more preferable to use Compared to other light sources, such laser light-emitting diodes are compact, have extremely high light source intensity, have a monochromatic light wavelength, and have high selectivity based on a certain wavelength, so they are excellent in concentration measurement. Reproducibility can be secured, and the service life is long.
- the setting and control of the frequency of the laser light emission can be easily and satisfactorily and accurately set and controlled to target characteristics.
- the concentration measuring apparatus can adopt the following configuration while maintaining high performance, and in particular, in order to solve the problem concerning the restriction on the installation place of the apparatus and the space for maintenance.
- the main body having at least a light emitting device and a light receiving device for laser light, and the above-mentioned concentration detecting portion for directly irradiating laser light into the liquid to be measured and receiving reflected light directly from the liquid to be measured are separated from each other.
- the main body and the concentration detector are connected by a flexible optical fiber.
- the flexible optical fiber a plurality of bundled lasers, an optical fiber for light emission and an optical fiber for light reception may be used as they are.
- the flexible optical fiber is preferably housed in a flexible tube, and preferably has a keple configuration covered with the tube. In this way, even when the flexible optical fiber is extended in a hostile environment, it can be protected by the covering tube.
- the main body can accommodate a light emitting device and a light receiving device, as well as a laser one light emitting circuit connected to the light emitting device and a light receiving amplifier circuit connected to the light receiving device.
- the part other than the concentration detecting part connected via the flexible optical fiber is separated as the main body part.
- the concentration measuring apparatus as described above is based on the premise that the density measurement is performed by the laser-diffused light reflection / reflection method. It can be measured with high sensitivity up to a relatively high concentration. Also, since a number of optical fibers for emitting laser light and optical fibers for receiving light are bundled to constitute one concentration detecting section, even if each optical fiber is thin and has a small amount of light emission / reception. Thus, a sufficiently large light emission amount and light reception amount can be achieved in total.
- the individual optical fibers are thin, for example, the light span between the light-emitting optical fiber and the light-receiving optical fiber that are in contact with each other on the sensor surface in the case of random arrangement is extremely small, and the optical sensitivity to concentration is greatly increased. Will be improved. As a result, it is possible to measure the concentration with high sensitivity and high accuracy from low concentrations to high concentrations of 1% or more, and even 3% or more, even if the properties and concentrations of the turbid components fluctuate. It is possible to measure stably and accurately with good tracking.
- the density detecting section since the density detecting section is separated from the main body, the density detecting section itself can be configured to be very small.
- the glass surface or lens surface that forms the laser light-receiving / emitting surface only needs to have a diameter of about 10 to 20 mm, and the length of the density detector is about 20 to 30 mm. Only needs to be done. With such a small concentration detector, it can be easily installed even in extremely narrow spaces or places where mounting was difficult in the past.
- the light guide of the laser light to the concentration detecting section and the light guide of the reflected light from the concentration detecting section are performed between the main body and the flexible optical fiber.
- the optical fiber is flexible, there is no particular restriction on the installation location and installation position of the main body.
- the main unit will be separated from the concentration detector even if it is installed in an unfavorable environment where the odor is emitted. It can be installed in a place with good environment. Therefore, the operating environment of the main unit including the electronic and electrical devices and the optical devices is maintained in a favorable condition, and the maintenance space for the main unit is easily secured. For the concentration detector, it is sufficient to secure a minimum inspection space.
- the entire concentration measuring device can be configured as a diffuse reflection type device capable of high-sensitivity detection, a high-sensitivity concentration measuring device and The desired performance is also achieved at the same time.
- the concentration of the turbid component is reduced by 1% or more while taking advantage of the advantage of the diffuse reflection method of laser light that the turbid component is hardly affected by the color.
- the concentration can be measured with extremely high sensitivity and accuracy up to a high concentration of 3% or more.
- fluctuations in the properties and concentrations of turbid components can be followed satisfactorily, and stable concentration measurement over a long period of time becomes possible.
- the shape between them can be set to a substantially free shape by utilizing the flexibility of the optical fiber, thereby facilitating easy operation.
- FIG. 1 is a schematic configuration diagram of a concentration measuring device according to a first embodiment of the present invention.
- FIG. 2 is a schematic sectional view showing an example in which the device of FIG. 1 is configured in a sensor form.
- FIG. 3 is a schematic configuration diagram of one surface of a sensor showing an example of an arrangement form of an optical fiber according to the present invention.
- FIG. 4 is a schematic configuration diagram of one surface of a sensor showing another arrangement of optical fibers according to the present invention.
- FIG. 5 is a schematic configuration diagram of a sensor surface showing still another arrangement of the optical fiber according to the present invention.
- FIG. 6 is a schematic configuration diagram of a sensor surface showing still another arrangement of the optical fiber according to the present invention.
- FIG. 7 is an explanatory diagram showing a light span according to an example of the present invention.
- FIG. 8 is an explanatory diagram showing an example of laser one-pulse drive according to the present invention.
- Fig. 9 shows the output characteristics obtained in an experiment conducted to confirm the effect of the present invention. It is.
- FIG. 10 is a schematic configuration diagram of a concentration measuring device according to a second embodiment of the present invention.
- Fig. 11 is a schematic cross-sectional view showing an example of a more specific configuration of the apparatus of Fig. 10 c
- Fig. 12 shows an arrangement example (first embodiment) of the concentration measuring apparatus according to the present invention It is a schematic structure figure.
- FIG. 13 is a schematic configuration diagram showing another arrangement example (second embodiment) of the concentration measuring device according to the present invention.
- FIG. 14 is a schematic configuration diagram showing another arrangement example (third embodiment) relating to the optical fiber of the concentration measuring device according to the present invention.
- FIG. 15 is a schematic configuration diagram showing yet another arrangement example (fourth embodiment) of the concentration measuring device according to the present invention.
- FIG. 16 is a schematic configuration diagram showing still another arrangement example (fifth embodiment) of the concentration measuring device according to the present invention.
- FIG. 17 is an explanatory diagram showing an example of a light span of a conventional device.
- FIG. 1 shows a basic configuration of a concentration measuring device according to a first embodiment of the present invention
- FIG. 2 shows an example of a case where the concentration measuring device is configured as a specific concentration sensor
- FIGS Each arrangement example on the sensor surface is shown.
- reference numeral 1 denotes the entire concentration measuring device, and the concentration measuring device 1 is configured in the form of a sensor, and is attached so that its tip faces, for example, the inside of the pipe 2.
- the concentration measuring device 1 detects the diffuse reflection light 6 of the laser light 5 emitted toward the turbid component 4 (for example, sludge particles) in the liquid 3 to be measured flowing through the pipe 2, thereby measuring the measurement target. It is configured as a diffuse reflection light type concentration measuring device that measures the concentration of the turbid component 4 in the liquid 3.
- a laser light emitting diode 7 (which may be abbreviated as a laser diode) that emits a high-intensity laser light in a specific wavelength range suitable for laser light emission is used as a laser light source.
- the pulse driving by the driving circuit 8 having an oscillator allows a laser beam to be emitted in a predetermined pulse form. I have.
- the laser light emitted by the laser light-emitting diode 7 is transmitted through the laser-light diffusion plate 9 to the optical fiber-fixing bracket. The incident end of a large number of light-emitting optical fibers 11 bundled and held by 10 Incident.
- the laser beam is radiated to the incident end of the light emitting optical fiber 11 in a state of being uniformly diffused by the laser beam diffusion plate 9.
- a large number of light emitting optical fibers 11 and substantially the same number of light receiving optical fibers 11 2 are bundled to form one concentration detecting section 13.
- the bundled light-emitting optical fiber 11 and light-receiving optical fiber 112 are held, for example, in a state in which their relative positions are fixed in a fixing bracket 14, and the positions of the tip surfaces of the optical fibers are aligned. It is formed on the sensor surface 15. From the sensor surface 15, the light is guided through the light emitting optical fiber 11, and the laser light emitted from the emission end of the light emitting optical fiber 11 is irradiated into the liquid 3 to be measured.
- the laser light that has been diffused and reflected upon the turbid component 4 in the liquid 3 to be measured is received at the incident end of the optical fiber 112 for light reception.
- the reception and emission of the laser light on the sensor surface 15 are performed through a glass plate 16 provided on the sensor surface 15.
- the material of the glass plate 16 is not particularly limited, but sapphire glass that is hard, scratch-resistant, chemically stable, and has excellent acid resistance, alkali resistance, solvent resistance, and thermal stability is also used. preferable.
- the surface of the glass plate 16 on the side of the liquid 3 to be measured be mirror-finished, since dirt due to sludge hardly adheres and scratches due to sludge and the like hardly occur.
- a lens having an appropriate focal length may be used instead of the glass plate 16.
- a plano-convex lens having a lens function by forming the sensor surface side as a flat surface and the other surface side as a convex surface is preferable. .
- the diffusely reflected light of the laser light received from the incident end of the optical fiber for reception 112 is guided through the optical fiber for reception 112 and is emitted from the emission end which is the opposite end. .
- a large number of light receiving optical fibers 12 are held in a bundled state by the optical fiber-fixing bracket 17 also at the end of the light receiving optical fiber 112 on the emission end side.
- the diffusely reflected light emitted from the emission end of the light receiving optical fiber 112 passes through the visible light power cut filter 18 in this embodiment, and the photodiode is used as a reflected light receiving element.
- the light is received by the mode 19, and the light amount is detected.
- the visible light power filter 18 By arranging the visible light power filter 18, the influence of disturbance light (for example, disturbance light from a fluorescent lamp or the like) on the concentration measurement can be reduced.
- the received light signal of the photodiode 19 is amplified by the amplifier circuit 20 and is output as a signal having a magnitude suitable for concentration measurement.
- FIG. 2 shows an example in which the concentration measuring device 1 having the above-described basic configuration is incorporated into one concentration measuring sensor.
- a stabilized power supply 23 as a power supply for the sensor, a laser diode drive circuit and an optical feedback compensation circuit are included in the sensor case 22.
- a laser-light emitting circuit 24, a light-receiving width circuit 25 having the same function as the amplifier circuit 20 in FIG. 1, a laser-light emitting diode 26, and a light-receiving photodiode 27 are provided.
- a thermistor 28 for performing temperature compensation of the laser light emitting diode 26 is further provided. Input and output of signals are performed via a connector 29 provided at one end of the main body case 22.
- a number of light-emitting optical fibers 30 that guide the laser light from the laser-light-emitting diode 26 and light-receiving optical fibers 13 that guide the reflected light to the photodiode 27 The optical fiber and the protective tube 32 are bundled and fixed and held in a predetermined arrangement form, and are formed on the entire surface of the sensor in a predetermined arrangement form with their ends aligned at the sensor distal end portion 33.
- the optical fiber protective tube 32 is formed in a straight tube in this embodiment, but since a large number of optical fibers bundled inside have flexibility, a bent tube or It is also possible to construct a longer tube.
- One tip 33 of the sensor is provided with a cap 34 that can be detached with a screw, and a glass plate 16 as shown in FIG.
- the optical fiber 1 is attached to this portion.
- a foam rubber for example, Filling with foamed silicone rubber prevents vibration of the optical fiber.
- the fiber When filled with epoxy resin or acryl resin in the optical fiber protection tube 3 2 and fixed, the light expands due to the thermal expansion of the resin. Since the fiber is affected and causes a temperature drift, it is preferable that the fiber be held by a foaming rubber having high elasticity and flexibility and capable of absorbing thermal expansion within its own volume range as described above.
- a large number of ultrafine optical fibers are bundled in a multi-core, but in this part, for example, a special epoxy resin excellent in heat resistance etc.
- the tip surface may be mirror-polished to form the sensor surface.
- the arrangement of the optical fiber for light emission and the optical fiber for light reception on the sensor surface of the concentration detecting section can take various forms as shown in FIGS.
- the arrangement shown in Fig. 3 is a circular sensor surface 41 in which light-emitting optical fibers 42 (open circles) and light-receiving optical fibers 43 (black circles) are randomly arranged. More preferably, as shown in FIG. 3, it is preferable to arrange the light emitting optical fibers 142 and the light receiving optical fibers 43 alternately adjacent to each other. This random configuration is most preferable from the viewpoint of the output characteristics and the magnitude of the output for the concentration measurement, as can be seen from the experiments described later.
- the light emitting optical fiber is located at the center of the sensor surface 41.
- Reference numeral 42 denotes a light receiving optical fiber 43 disposed concentrically therearound.
- the arrangement shown in FIG. 5 is such that a light receiving optical fiber 43 is arranged in the center of the sensor surface 41 and a light emitting optical fiber 42 is arranged concentrically therearound.
- the light emitting optical fiber 142 is arranged on one half surface, that is, one semicircle portion, of the sensor surface 41, and the light receiving optical fiber is arranged on the other half surface, that is, the other semicircle portion.
- the optical fibers 1 and 3 are arranged. In any of the arrangements shown in FIGS. 3 to 6, sufficiently excellent characteristics for concentration measurement aimed at by the present invention can be obtained as shown in the experimental results described later.
- FIGS. 3 to 6 are schematic illustrations, and the total number of optical fibers on the sensor surface is assumed to be much larger than that shown in the figure, and the total number is 100 to 50, 0, 0. It is appropriately set within a range of about 100 lines. Even if one optical fiber is an ultra-fine optical fiber and the measurement is impossible due to insufficient light intensity with a single core, for example, one hundred and fifty optical fibers for light emission and one for light reception By setting the number of fibers to 1,500, a total of about 3,000, it is possible to obtain sufficient light emission and light reception It is.
- a sufficient quantity of light can be obtained by setting the number to 100 to 500, 000 lines, particularly to a total of 100 or more lines, more preferably about 300 lines.
- the bundled light emitting optical fiber 11 and light receiving optical fiber 11 2 are each made of an ultrafine optical fiber, the light span in the concentration measurement can be reduced to the limit. For example, when considering the form of the random arrangement shown in FIG. 3 described above, for example, when the diameter of the optical fiber is 30 ⁇ m, as shown in FIG. The light span L between the optical fibers 152 is about 30 / m, and an extremely small light span can be obtained.
- an optical sensitivity of 167 times higher than that for density measurement can be obtained.
- low concentrations of turbid components are of course, high concentrations exceeding 1%, especially high concentrations exceeding 3%, and even high concentrations exceeding 5% It becomes possible to measure with.
- it since it has high sensitivity, it can follow changes in the properties and concentrations of turbid components satisfactorily, enabling stable and accurate concentration measurements.
- a laser light source that emits high-intensity laser light in a specific wavelength range is used instead of a normal LED as a light source for a single laser light, so it has a sufficient light source compared to other light sources.
- the target ⁇ wave number characteristics can be obtained accurately during pulse driving. An excellent pulse drive characteristic that enables the desired emission of light to the lamp is also obtained.
- the pulse driving of the laser beam is controlled, for example, as shown in FIG. In the illustrated example, c of 2 ms. It is driven with a pulse and the pulse interval is set to 150 ms. Therefore, the duty ratio is 1:75, and the power consumption is 1.33%, compared with the case of continuous lighting, and power saving is achieved.
- the example shown in FIG. 8 is merely an example, and the pulse width, pulse interval, and duty ratio can be freely set according to the target pulse drive characteristics.
- the laser pulse light can be stabilized.
- the light intensity fluctuates greatly with changes in the ambient temperature, so temperature compensation must be performed.
- the above-described optical feedback is required. Stable pulse emission is possible only by the method.
- temperature compensation using a thermistor or the like may be performed.
- the concentration measuring apparatus can achieve extremely high sensitivity, and can measure the turbidity in the liquid to be measured from a low concentration range to a high concentration range exceeding 1%, and even a high concentration range exceeding 3%.
- the concentration of the component can be measured with high accuracy.
- the following experiment was conducted to examine the performance of the concentration measuring device according to the present invention.
- the arrangement of the optical fibers on the sensor surface was set to the various configurations shown in Figs. 3 to 6, and pseudo-sludge was contained as the liquid to be measured.
- the characteristics (the characteristics of the output [output voltage] corresponding to the measured concentrations) in the concentration measurement were examined.
- yeast cells were used as pseudo-sludge, but the pseudo-sludge is not limited to this, and formazin, solka floe, kaolin, etc. can also be used.
- the outer diameter of one sensor surface was 10 mm, and a 1 mm thick sapphire glass plate was mounted on the sensor surface for measurement.
- Table 1 and FIG. In Tables 1 and 9, “random” is the configuration shown in Figure 3, “double circle (center light)” is the configuration shown in Figure 4, and “double circle (outer circle light)” is the configuration shown in Figure 4.
- the arrangement form shown in FIG. 5 and “half circle” correspond to the arrangement form shown in FIG. 6, respectively.
- the output data in Table 1 and Figure 9 It is expressed as the ratio to the full scale after the amplification circuit (the ratio when the full scale is set to 100% and expressed in%).
- Table 1 and Fig. 9 show the output and the pseudo-sludge concentration (%). It shows the relationship.
- FIG. 10 shows a basic configuration of a concentration measuring device according to a second embodiment of the present invention
- FIG. 11 shows an example of a specific configuration thereof
- FIG. 12 shows a concentration detecting unit and a main body of the concentration measuring device.
- An example of the arrangement of the units is shown.
- Each of the arrangement forms in the concentration detecting section of the optical fiber can take the various forms shown in FIGS. 3 to 6 described above.
- the concentration measuring device 35 according to the present embodiment shown in FIG. 10 and FIG.
- a main body portion 36 including each element for emitting laser light and each element for receiving laser light, and a concentration detecting portion 37 are separated from each other. Both are connected by a bundle of a light emitting optical fiber 38 and a light receiving optical fiber 39 bundled in a large number as a flexible optical fiber.
- the light-emitting optical fiber 38 and the light-receiving optical fiber 39 extend between the main body 36 and the concentration detector 37 long.
- the flexible light emitting optical fiber 38 and the light receiving optical fiber 39 are arranged between the main body 36 and the concentration detecting section 37. And is formed in the form of a long-extending flexible optical fiber cable.
- the laser-light-emitting part, laser light-emitting circuit, laser-light receiving part, and light-receiving amplifier circuit have the same configuration as that shown in FIG.
- FIG. 12 schematically shows an example of an arrangement in a case where the concentration measuring device 35 configured as shown in FIG. 11 is used for measuring the concentration of sludge (first embodiment).
- the small-sized concentration detection section 37 described above is attached to the pipe wall of the sludge pipe 61, and the main body section 36 separated therefrom is placed in a safe and secure remote place.
- the concentration detecting section 37 and the main body section 36 are connected by a long extending flexible optical fiber cable 62.
- This optical fiber-to-cable 62 can be used for a considerably long length as long as the transmission loss due to the internal optical fiber is below a predetermined level. Since the transmission loss of an optical fiber is generally extremely small, if the length of the optical fiber cable 62 is about 100 m, there will be no problem in concentration measurement, and in some cases, it will be extended to several kilometers. It is also possible.
- the concentration detector 37 can be formed as a very small member as long as it can form only one surface of the sensor with the tip of the optical fiber aligned in a predetermined arrangement form, and as shown in FIG. It can be easily installed even in places where installation is troublesome in a bad environment, and even when the work space is small. Once installed, there is no need for frequent maintenance because there are no adjustment devices, etc., and in some cases, maintenance-free operation is possible. ' It is sufficient that the signal detected by the concentration detecting section 37 can be transmitted through the optical fiber cable 62, and the optical fiber cable 62 can be freely extended even on a flexible and relatively complicated route.
- the concentration detector 37 can be installed in places where conventional placement was difficult, such as underground water storage tanks, slurry storage tanks, and sludge sedimentation tanks. Also, it can be easily installed at a desired site.
- the main body 36 is connected to the concentration detecting section 37 via a flexible and long optical fiber cable 62, there is no restriction on the installation place and the installation posture. Therefore, it can be installed under a favorable environment, and the main body 36 including the optical device and the electronic and electric circuits can be freely installed in a place where the adjustment and maintenance can be performed easily and safely. Therefore, good operation of each device and circuit of the main body 36 is reliably guaranteed, and the measurement sensitivity and performance of the entire concentration measuring device 35 are ensured for a long period of time.
- the concentration detecting section 37 and the main body section 36 are directly connected by the optical fiber cable 62, but as shown in FIG. 13 as shown in the second embodiment.
- Optical connectors 63a and 63b are used at both ends of the optical fiber cable 62 and connected to the density detecting section 37 and the main body 36 via the optical connectors 63a and 63b. You may do so. With this configuration, the optical connector c that has the effect of reducing installation work on site can be provided only at one end of the optical fiber cable 62.
- the concentration detecting section 74 having a random arrangement section 73 in which a light emitting optical fiber 71 and a light receiving optical fiber 72 are arranged at random
- the random arrangement of the light-emitting optical fiber 7 1 and the light-receiving optical fiber 7 2 is limited to the minimum necessary short area on the sensor surface 7 7 side in the concentration detecting section 7 4.
- the optical fiber for light emission 71 and the optical fiber for light reception 72 are branched out from there. Arranging optical fibers randomly is more complicated than arranging them separately.
- the concentration detecting section and the main body section have a one-to-one correspondence, but in the present invention, if necessary, however, it is also possible to detect signals from a plurality of concentration detectors installed in different locations with one main unit.
- an optical fiber cable is arranged in parallel from each concentration detector to the main unit, or a branch optical fiber cable is connected from each main optical fiber cable to each concentration detector via an optical selector.
- the wavelengths of the measurement waves in the respective density detectors are set to different wavelengths, the density measurement corresponding to the respective density detectors can be performed.
- a plurality of sludge pipes 8 1a ⁇ 8 1n are provided with concentration detecting sections 8 2a ⁇ 8 2 n, respectively.
- -8-2 n are connected in parallel with optical fiber cables 8 3 a « ⁇ 8 3 n, and these optical fiber cables 8 3 a ⁇ ⁇ ⁇ 8 3 n are connected to one main body 8 4 You can do so.
- the sludge concentration in each sludge pipe 8 1a ... 8 1n can be centrally controlled by one main unit 84, making it easier to manage.
- the installation of the unit 84 can be facilitated, the installation space can be reduced, and the manufacturing cost of the main unit 84 can be reduced.
- a plurality of sludge pipes 9 1a ⁇ 9 1n are provided with concentration detection sections 9 2a ⁇ 9 2 n, respectively.
- 9 2 n is connected in parallel with a branched optical fiber cable 9 3 a ⁇ ⁇ ⁇ 9 3 n, and these branched optical fiber cables 9 3 a ⁇ ⁇ ⁇ 9 3 n are connected to an optical selector 9 4
- the optical selector 94 once aggregates the detected optical signals, from the optical selector 94 through a single main optical fiber cable 95 or a plurality of main optical fiber cables less than the number of branch optical fiber cables. Can be connected to the main body 96.
- the main unit 9 6 By setting the wavelengths of the measurement waves at the concentration detectors 9 2 a to 9 2 n to different wavelengths, and switching the signal sent to the main unit 96 with the optical selector 19, the main unit 9 6 In each The density measurement corresponding to the density detection unit can be performed. In many cases, the frequency of sludge concentration measurement does not need to be very high. By adopting such a configuration, it is possible to reduce the cost of the entire system while securing the necessary concentration measurement function.
- the concentration measuring device of the present invention can measure a high concentration of a turbid component with high sensitivity, it can be suitably used particularly for measuring a sludge concentration.
- the concentration detector and the main body are separated and connected with a long flexible optical fiber cable, the concentration detector can directly detect the concentration even in a narrow place or in a bad environment.
- the system can be installed and a system suitable for measuring sludge concentration can be constructed.
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2001288088A AU2001288088A1 (en) | 2000-09-22 | 2001-09-21 | Concentration measurer |
KR1020027006495A KR20020063577A (ko) | 2000-09-22 | 2001-09-21 | 농도 측정 장치 |
EP01967772A EP1319939A4 (en) | 2000-09-22 | 2001-09-21 | CONCENTRATION MEASURING DEVICE |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000288939A JP2002098637A (ja) | 2000-09-22 | 2000-09-22 | 濃度測定装置 |
JP2000-288939 | 2000-09-22 | ||
JP2001035012A JP2002243640A (ja) | 2001-02-13 | 2001-02-13 | 濃度測定装置 |
JP2001-35012 | 2001-02-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002025254A1 true WO2002025254A1 (fr) | 2002-03-28 |
Family
ID=26600548
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2001/008222 WO2002025254A1 (fr) | 2000-09-22 | 2001-09-21 | Dispositif de mesure de concentration |
Country Status (5)
Country | Link |
---|---|
US (1) | US20030020030A1 (ja) |
EP (1) | EP1319939A4 (ja) |
KR (1) | KR20020063577A (ja) |
AU (1) | AU2001288088A1 (ja) |
WO (1) | WO2002025254A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002365216A (ja) * | 2001-06-08 | 2002-12-18 | Tokyoto Gesuido Service Kk | 濃度測定装置 |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE602007008288D1 (de) * | 2006-12-12 | 2010-09-16 | Koninkl Philips Electronics Nv | Probenkonzentrationsdetektor mit temperaturausgleich |
DE102008022372A1 (de) * | 2008-05-06 | 2009-11-12 | Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG | Vorrichtung zur Trübungsmessung |
DE102008047467B4 (de) * | 2008-09-17 | 2010-09-02 | Ingede Internationale Forschungsgemeinschaft Deinking-Technik E. V. | Messverfahren zur Beurteilung der Verunreinigung von fluiden Medien und Messzelle hierfür |
EP2259048A1 (en) * | 2009-06-03 | 2010-12-08 | Koninklijke Philips Electronics N.V. | Measuring reflectance using waveguide for coupling light to larger volume of sample |
US20160113228A1 (en) * | 2013-06-18 | 2016-04-28 | Delaval Holding Ab | Method and apparatus for cleaning an optical detection device |
KR102161058B1 (ko) * | 2013-12-24 | 2020-09-29 | 삼성전자주식회사 | 광학검출장치 및 측정오차의 보정방법 |
GB201907572D0 (en) | 2019-05-29 | 2019-07-10 | Colvistec Ag | Multi-fibre optical probe |
Citations (6)
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JPS57190254A (en) * | 1981-05-20 | 1982-11-22 | Inoue Japax Res Inc | Probe for turbidity gauge |
JPH01165936A (ja) * | 1987-12-22 | 1989-06-29 | Meidensha Corp | 懸濁物濃度検出装置 |
JPH02173553A (ja) * | 1988-12-26 | 1990-07-05 | Agency Of Ind Science & Technol | 高濃度濁度測定法ならびに測定装置 |
JPH0547850U (ja) * | 1991-11-29 | 1993-06-25 | 株式会社島津製作所 | 濁度計 |
JPH06138032A (ja) * | 1992-10-23 | 1994-05-20 | Hitachi Cable Ltd | 高感度光反射センサ |
JPH08261928A (ja) * | 1995-03-17 | 1996-10-11 | Aretsuku Denshi Kk | 濁度検出器 |
Family Cites Families (9)
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EP0047094B1 (en) * | 1980-08-21 | 1986-11-20 | Oriel Scientific Limited | Analytical optical instruments |
JPH02276947A (ja) * | 1989-04-18 | 1990-11-13 | Nireco Corp | 光拡散反射測定用プローブおよび支持装置 |
JPH03259730A (ja) * | 1990-03-09 | 1991-11-19 | Iiosu:Kk | 光ファイバセンサ |
US5304492A (en) * | 1991-11-26 | 1994-04-19 | The State Of Oregon Acting By And Through The State Board Of Higher Education On Behalf Of Oregon State University | Spectrophotometer for chemical analyses of fluids |
US5191388A (en) * | 1991-12-18 | 1993-03-02 | Flow Vision, Inc. | Apparatus for detecting and analyzing particulate matter in a slurry flow |
DE69228667T2 (de) * | 1991-12-24 | 1999-09-30 | The Whitaker Corp., Wilmington | Optisches Kopplungselement |
US5625459A (en) * | 1995-03-03 | 1997-04-29 | Galileo Electro-Optics Corporation | Diffuse reflectance probe |
JP3772189B2 (ja) * | 1995-06-09 | 2006-05-10 | コンメド コーポレイション | 血液酸素飽和度の光学的測定のためのセンサ、その測定方法、及びその測定装置 |
US6124597A (en) * | 1997-07-07 | 2000-09-26 | Cedars-Sinai Medical Center | Method and devices for laser induced fluorescence attenuation spectroscopy |
-
2001
- 2001-09-21 US US10/169,707 patent/US20030020030A1/en not_active Abandoned
- 2001-09-21 KR KR1020027006495A patent/KR20020063577A/ko not_active Application Discontinuation
- 2001-09-21 EP EP01967772A patent/EP1319939A4/en not_active Withdrawn
- 2001-09-21 WO PCT/JP2001/008222 patent/WO2002025254A1/ja not_active Application Discontinuation
- 2001-09-21 AU AU2001288088A patent/AU2001288088A1/en not_active Abandoned
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57190254A (en) * | 1981-05-20 | 1982-11-22 | Inoue Japax Res Inc | Probe for turbidity gauge |
JPH01165936A (ja) * | 1987-12-22 | 1989-06-29 | Meidensha Corp | 懸濁物濃度検出装置 |
JPH02173553A (ja) * | 1988-12-26 | 1990-07-05 | Agency Of Ind Science & Technol | 高濃度濁度測定法ならびに測定装置 |
JPH0547850U (ja) * | 1991-11-29 | 1993-06-25 | 株式会社島津製作所 | 濁度計 |
JPH06138032A (ja) * | 1992-10-23 | 1994-05-20 | Hitachi Cable Ltd | 高感度光反射センサ |
JPH08261928A (ja) * | 1995-03-17 | 1996-10-11 | Aretsuku Denshi Kk | 濁度検出器 |
Non-Patent Citations (1)
Title |
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See also references of EP1319939A4 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002365216A (ja) * | 2001-06-08 | 2002-12-18 | Tokyoto Gesuido Service Kk | 濃度測定装置 |
JP4709430B2 (ja) * | 2001-06-08 | 2011-06-22 | 東京都下水道サービス株式会社 | 濃度測定装置 |
Also Published As
Publication number | Publication date |
---|---|
KR20020063577A (ko) | 2002-08-03 |
EP1319939A4 (en) | 2005-11-23 |
EP1319939A1 (en) | 2003-06-18 |
US20030020030A1 (en) | 2003-01-30 |
AU2001288088A1 (en) | 2002-04-02 |
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