Water content measurement device and water content measurement method

Abstract

To provide a water content rate measurement device and a water content rate measurement method which can highly accurately measure a water content rate of dewatered sludge regardless of distance fluctuation between the dewatered sludge being a measurement target and an infrared moisture meter while suppressing increase in the man-hours of constructing a regression equation for converting optical information measured by the infrared moisture meter into the water content rate.SOLUTION: A water content rate measurement device comprises: an optical sensor which irradiates a measurement object with light to measure optical information; a distance sensor which measures distance information for obtaining distance fluctuation between the measurement object and the optical sensor; and a computing machine which measures a water content rate of the measurement object. The computing machine corrects the optical information on the basis of the distance fluctuation based on the distance information and calculates the water content rate of the measurement object by applying the corrected optical information to a calibration model that derives the water content rate from the optical information.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a water content measuring device and a water content measuring method, and more particularly to a water content measuring device and a water content measuring method for measuring the water content of sludge discharged from a sewage or wastewater treatment facility.

Background Art

[0002] Patent Document 1 discloses a technique in which sludge is a measurement target, an infrared moisture meter and a sensor for detecting the distance to the measurement target are arranged, and the output of the infrared moisture meter is corrected based on the output of the distance sensor to obtain the moisture content.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Sludge discharged from a sewage treatment facility or the like is subjected to a dehydration treatment to reduce moisture with a sludge dehydrator (hereinafter, the dehydrated sludge is referred to as "dehydrated sludge"). It is necessary to keep the water content constant for post-treatment such as incineration. The water content is measured by a water content measuring means such as an infrared moisture meter, and the operating conditions of the dehydration treatment equipment are adjusted according to the measured value.

[0005] However, when the distance between the dehydrated sludge as the measurement object and the infrared moisture meter changes, there is a problem that the measurement accuracy of the water content measured by the infrared moisture meter decreases due to a change in the optical information (absorbance or reflectance) input to the infrared moisture meter.

[0006] For example, Patent Document 1 discloses a technique in which dehydrated sludge is used as a measurement object, an infrared moisture meter and a sensor for detecting the distance to the measurement object are arranged, and the output of the infrared moisture meter is corrected based on the output of the sensor for detecting the distance to obtain the moisture content. In the method described in Patent Document 1, it is necessary to model the relationship between the optical information and the moisture content of the dehydrated sludge at each distance and preset it as a regression equation. That is, it is necessary to construct a plurality of regression equations according to the distance. Therefore, although there may be a certain effect in obtaining the moisture content by selecting a regression equation according to the distance, since it is necessary to construct a plurality of regression equations in advance according to the distance, the man-hour for constructing the regression equation increases.

[0007] The present invention has been made to solve the above problems. That is, one of the objects of the present invention is to suppress an increase in the man-hour for constructing a regression equation for converting optical information measured by an infrared moisture meter into a moisture content, and to measure the moisture content of dehydrated sludge as a measurement object with high accuracy regardless of the distance variation between the dehydrated sludge and the infrared moisture meter. An object of the present invention is to provide a moisture content measuring device and a moisture content measuring method.

Means for Solving the Problems

[0008] In order to solve the above problems, a moisture content measuring device of the present invention includes an optical sensor that irradiates light on a measurement object to measure optical information, a distance sensor that measures distance information for obtaining a distance variation that is a change amount from a predetermined reference distance between the measurement object and the optical sensor, and a computer that measures the moisture content of the measurement object based on the distance information and the optical information. The computer is configured to correct the optical information based on the distance variation based on the distance information, and calculate the moisture content of the measurement object by applying the corrected optical information to a calibration model that derives the moisture content from the optical information.

[0009] The water content measurement method of the present invention is a water content measurement method using an optical sensor that irradiates light on an object to be measured to measure optical information, a distance sensor that measures distance information for obtaining a distance variation that is a variation from a predetermined reference distance of the distance between the object to be measured and the optical sensor, and a computer that measures the water content of the object to be measured based on the distance information and the optical information. The computer corrects the optical information based on the distance variation based on the distance information, and calculates the water content of the object to be measured by applying the corrected optical information to a calibration model that derives the water content from the optical information.

Advantages of the Invention

[0010] According to the present invention, while suppressing an increase in the man-hours for constructing a regression equation for converting optical information measured by an infrared moisture meter into the water content, the water content of dewatered sludge can be measured with high accuracy regardless of the distance variation between the dewatered sludge as the measurement object and the infrared moisture meter.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3A

Figure 3B

Figure 4

Figure 5

Figure 6

Figure 7A

Figure 7B

Figure 8

Embodiments for Carrying Out the Invention

[0012] Hereinafter, each embodiment of the present invention will be described in detail. The following embodiments are examples for explaining the present invention and are not intended to limit the present invention to the following content.

[0013] <<First Embodiment>> FIG. 1 is a configuration diagram showing an example of a moisture content measuring device according to the first embodiment of the present invention. The moisture content measuring device according to the first embodiment is attached to a sludge dehydrator 5 that reduces the moisture content of sludge discharged from a sewage or wastewater treatment facility, and measures the moisture content of the dehydrated sludge discharged from the sludge dehydrator 5 in real time. Note that the moisture content indicates the weight ratio of the moisture contained in the dehydrated sludge as a percentage. The moisture content measuring device may be a system, a part of a system, or a single device.

[0014] The sludge dehydrator 5 includes a dehydration unit 51 that receives sludge and discharges moisture, and a sludge discharge unit 52 that outputs dehydrated sludge with reduced moisture. The moisture content measuring device arranges an infrared measuring unit 2 that irradiates light on the surface of the dehydrated sludge in the sludge discharge unit 52 to measure the moisture content, and a distance sensor 3 that measures the distance between the dehydrated sludge that is the moisture content measurement target and the probe in the infrared measuring unit 2.

[0015] The infrared measurement signal output by the infrared measurement unit 2 is input to the infrared signal processing device 4, converted into infrared reflectance information, and then input to the arithmetic processing unit 1. The infrared signal processing device 4 is composed of, for example, a spectroscope. The infrared measurement unit 2 or the infrared measurement unit 2 and the infrared signal processing device 4 may sometimes be referred to as an "optical sensor".

[0016] The distance measurement signal of the distance sensor 3 is input to the arithmetic processing unit 1. Note that the distance sensor 3 may measure the distance between the dewatered sludge and the probe in the infrared measurement unit 2, or may measure the displacement from a predetermined position (for example, the position of the surface of the reference dewatered sludge). The distance or displacement from a predetermined position measured by the distance sensor 3 is also referred to as "distance information". The amount of change from a predetermined reference distance of the distance between the dewatered sludge, which is the object to be measured, and the optical sensor (probe in the infrared measurement unit 2) is referred to as "distance variation" or "amount of distance variation". Note that the distance variation can be obtained based on the distance information.

[0017] The arithmetic processing unit 1 calculates moisture content information with the influence of distance variation suppressed from the input infrared reflectance information and distance measurement signal, and outputs it to the moisture content display unit 6. The moisture content display unit 6 displays the moisture content of the dewatered sludge in the sludge discharge unit 52 in real time. The infrared measurement unit 2 is disposed to face the dewatered sludge discharged from the sludge discharge unit 52, and the distance sensor 3 is disposed in the vicinity of the infrared measurement unit 2.

[0018] Note that as the sludge dehydrator 5, a filter press, a centrifugal dehydrator, a belt press, a screw press, a multi-disc dehydrator, an electroosmotic dehydrator, or the like can be adopted.

[0019] FIG. 2 is a diagram showing an example of the infrared measurement unit 2 and the distance sensor 3. The infrared measurement unit 2 includes an irradiation light probe 21 that irradiates the surface of the dewatered sludge with infrared rays, and a light receiving probe 22 that receives the infrared rays reflected from the surface of the dewatered sludge. The light receiving probe 22 is disposed at a predetermined angle θ with respect to the optical axis of the irradiation light probe 21. Note that infrared rays are classified into near-infrared rays, mid-infrared rays, and far-infrared rays according to the wavelength region. The irradiation light probe 21 irradiates, for example, near-infrared light in a wavelength region of 800 nm to 2400 nm.

[0020] The end face of the irradiation light probe 21 is disposed at a predetermined distance L1 from a reference position (for example, the surface of the dewatered sludge), and the end face of the light receiving probe 22 is disposed at a predetermined distance L2 from the above reference position.

[0021] The distance sensor 3 is disposed at a predetermined angle β with respect to the optical axis of the irradiation light probe 21. Note that the angle β may be 0°, that is, it may not be inclined. The distance sensor 3 measures the distances L1 and L2 between the surface of the dehydrated sludge and the irradiation light probe 21 and the light receiving probe 22. The measurement method by the distance sensor 3 is not particularly limited, and for example, measurement methods such as optical, acoustic, contact, displacement, and scale methods can be used.

[0022] FIG. 3A is a block diagram showing an example of the functions of the arithmetic processing unit 1. The arithmetic processing unit 1 includes a preprocessing unit 72 that inputs the infrared reflectance information from the infrared signal processing device 4 as infrared information (specifically, for example, information indicating an infrared spectrum (infrared spectrum in a specific wavelength region)) and performs predetermined preprocessing on the infrared information. An example of the infrared spectrum is represented by a graph with the horizontal axis: wavelength and the vertical axis: absorbance. Note that the items on the horizontal and vertical axes are not limited to this. An example of a specific wavelength region is, for example, the region from 1200 nm to 2200 nm (see FIGS. 7A and 7B), but is not limited thereto.

[0023] Furthermore, it includes a distance correction calculation unit 73 that inputs the preprocessed infrared information output by the preprocessing unit 72 and the distance information that is the distance measurement signal of the distance sensor 3, acquires a preset distance correction formula from the distance correction formula storage unit 76, and performs a distance correction calculation on the infrared information (optical information) on which predetermined preprocessing has been performed. In addition, it further includes a regression calculation unit 74 that inputs the infrared information on which the distance correction calculation has been performed, acquires a preset regression formula from the regression formula storage unit 75, calculates the moisture content of the dehydrated sludge, and outputs it as moisture content information. Note that the distance information (distance measurement signal) may be information indicating the distance L1, information indicating the distance L2, information indicating a distance based on the distances L1 and L2, or information indicating a displacement from a predetermined position (for example, the position of the surface of the reference dehydrated sludge).

[0024] The preprocessing unit 72 performs preset processes such as smoothing to remove noise from the input infrared information and offset correction to correct the intensity of the base spectrum for detecting the peak of the infrared absorption rate of dewatered sludge, and outputs the preprocessed infrared information. The processes performed by the preprocessing unit 72 are not particularly limited as long as they are preset processes and can be freely selected.

[0025] The distance correction formula storage unit 76 stores a distance correction formula for performing calculations using a coefficient (correction coefficient) based on distance information (distance variation based on distance information) for the infrared information (optical information). The distance correction formula is preset and outputs the distance correction formula to the distance correction calculation unit 73 based on the distance information.

[0026] The regression formula storage unit 75 stores a regression formula (or regression model) with the infrared information as the explanatory variable and the moisture content as the target variable. The regression formula is preset. For example, a regression formula 75-1 with the infrared information as the explanatory variable is stored. An example of the regression formula 75-1 is, for example, the calculation formula (A) in FIG. 3B. It is preferable that there is one regression formula 75-1, but a plurality of different regression formulas may be stored according to factors other than the distance variation. The regression formula (regression model) may be referred to as a "calibration model" for convenience.

[0027] FIG. 4 is a block diagram showing an example of the functions of the arithmetic processing unit 1. The arithmetic processing unit 1 is a computer including a processor 11, a memory 12, a storage device 13, an input / output device 14, and an interface 15.

[0028] Connected to the interface 15 are a distance sensor 3, an infrared signal processing device 4, and a moisture content display unit 6. The input / output device 14 is composed of a keyboard, a mouse, a display, and a touch panel (not shown). The storage device 13 is composed of a non-volatile storage medium and holds data such as the regression formula storage unit 75 and the distance correction formula storage unit 76.

[0029] In the memory 12, a control unit 71, a preprocessing unit 72, a distance correction calculation unit 73, and a regression calculation unit 74 are loaded as programs and executed by the processor 11. The control unit 71 controls the arithmetic processing by inputting and outputting information from the input / output device 14. For example, when the control unit 71 receives the selection result of distance correction from the input / output device 14, it commands the distance correction formula 76 to be used by the distance correction calculation unit 73.

[0030] The preprocessing unit 72 performs preset preprocessing, such as smoothing, on the input infrared reflectance information as described above, and outputs the preprocessed infrared information. The distance correction calculation unit 73 performs distance correction calculation on the infrared information based on the input distance information, and outputs the distance-corrected infrared information. The regression calculation unit 74 calculates the moisture content using the explanatory variables of the specified regression formula 75-1.

[0031] The processor 11 operates as a functional unit that provides a predetermined function by processing according to the programs of the respective functional units. For example, the processor 11 functions as the regression calculation unit 74 by processing according to the regression calculation program. The same applies to other programs. Furthermore, the processor 11 also operates as a functional unit that provides each function of a plurality of processes executed by each program.

[0032] A computer is a device including these functional units. A system including these functional units may be configured by a system including a computer. The computer may be a plurality of computers, or may be a virtual computer on the cloud.

[0033] FIG. 5 is a diagram showing an example of a screen displayed on the input / output device 14. On the display constituting the input / output device 14, a measurement start button 81, a measurement stop button 82, correction parameters 83, a moisture content 84, and a measurement result 85 are displayed.

[0034] The measurement start button 81 is a button composed of an image. When the button is operated (for example, clicked), the calculation process of the moisture content starts. Also, the measurement stop button 82 is a button composed of an image. When the measurement stop button 82 is operated, the calculation process of the moisture content stops.

[0035] The correction parameter 83 includes a distance correction checkbox. When distance correction is checked, the distance correction calculation unit 73 executes calculation processing.

[0036] The moisture content 84 displays the moisture content calculated by the regression calculation unit 74 in time series. The measurement result 85 displays the measurement date and time and the value of the moisture content. Note that the display of the input / output device 14 may be used as the moisture content display unit 6.

[0037] With the above configuration, the arithmetic processing unit 1 performs predetermined preprocessing on the infrared reflectance information (infrared information) measured by the infrared measurement unit 2 by the preprocessing unit 72, corrects the infrared information by the distance correction calculation unit 73 based on the distance information measured by the distance sensor 3, and calculates the moisture content of the dewatered sludge by the regression formula 75 using the infrared information as an explanatory variable.

[0038] <Distance correction calculation method> Next, the distance correction calculation method in the moisture content measurement device according to the first embodiment will be described in more detail. The distance correction calculation unit 73 inputs the infrared information output from the preprocessing unit 72 and the distance information that is the distance measurement signal of the distance sensor 3. The distance correction calculation unit 73 reads out the distance correction formula stored in the distance correction formula storage unit 76 based on the input distance information.

[0039] FIG. 6 is a diagram showing an example of the correction coefficient (information showing the relationship between the correction coefficient and the distance variation) stored in the distance correction formula storage unit 76. The correction coefficient is preset. Note that the information showing the relationship between the correction coefficient and the distance variation can be obtained by performing experiments or the like in advance.

[0040] The distance correction type storage unit 76 reads out a correction coefficient based on the amount of distance variation (i.e., displacement amount) from the reference, and outputs Equation 1 to the distance correction calculation unit 73. "Infrared information after distance correction" = "correction coefficient" × "infrared information before distance correction" … (Equation 1) More specifically, the infrared information in Equation 1 means, for example, the absorbance at each wavelength (infrared absorption spectrum in a specific wavelength region). The distance correction calculation unit 73 executes the calculation of Equation 1 at each wavelength and outputs the distance-corrected infrared information (absorbance at each wavelength) as a result.

[0041] Thus, in the present invention, it is only necessary to prepare a correction coefficient corresponding to distance variation in advance, and there is no need to construct a regression equation for each distance. Therefore, an increase in the man-hours for constructing the regression equation can be suppressed.

[0042] <Effect> Next, the effect of the distance correction calculation unit 73 will be described from the viewpoints of infrared information and moisture content measurement accuracy.

[0043] Figures 7A and 7B are graphs showing an example of infrared information (absorbance at each wavelength) before and after executing distance correction calculation in the distance correction calculation unit 73. Figure 7A shows the infrared information before executing the distance correction calculation, and Figure 7B shows the infrared information after executing the distance correction calculation. In Figure 7A, compared with the case where there is no distance variation (0 mm), the value of the absorbance varies when there is distance variation. Specifically, the greater the distance variation in the negative direction with respect to the reference (the shorter the distance compared to the reference distance (the closer the dewatered sludge is to the optical sensor)), the greater the error in the direction of increasing absorbance. The greater the distance variation in the positive direction with respect to the reference (the longer the distance compared to the reference distance (the farther the dewatered sludge is from the optical sensor)), the greater the error in the direction of decreasing absorbance.

[0044] In FIG. 7B, even when compared with the case where there is no distance variation (0 mm), the variation in the absorbance value in the case where there is distance variation is suppressed. From this result, it was confirmed that the influence of distance variation can be suppressed by executing distance correction calculation in the distance correction calculation unit 73.

[0045] FIG. 8 is a graph showing the moisture content output based on infrared information in the regression calculation unit 74. The black plots in FIG. 8 are graphs showing the moisture content of the examples in which the distance correction calculation was executed in the distance correction calculation unit 73 of the moisture content measuring device according to the first embodiment. The white plots in FIG. 8 are comparative examples for this example, and are graphs showing the moisture content when the distance correction calculation is not executed. The horizontal axis in FIG. 8 means the distance variation (displacement amount) when the distance variation at the reference distance is 0 mm, and the vertical axis in FIG. 8 means the difference (measurement error of the moisture content) from the moisture content measured at the reference distance (distance variation: 0 mm).

[0046] It was confirmed that in the case with distance correction which is this example, the measurement error of the moisture content is small compared with the case without distance correction which is the comparative example. That is, it was confirmed that the effect of improving the measurement accuracy of the moisture content can be obtained even when there is distance variation.

[0047] Therefore, according to the present invention, since it is not necessary to construct a regression equation for each distance, it is possible to accurately measure the moisture content even when there is distance variation while suppressing an increase in the man-hours for constructing the regression equation.

[0048] Also, as shown by the black plots in FIG. 8, in the first embodiment, there is an effect of suppressing the influence of distance variation on the moisture content measurement accuracy, but when the distance variation is large, the effect of suppressing the influence of distance variation may decrease. Even in such a case, when the distance variation is large, the measurement result of the moisture content is not displayed, and the measurement result of the moisture content is output only when the distance variation is within a predetermined range, so that only the moisture content with high measurement accuracy can be displayed. According to FIG. 8, as the predetermined distance variation range, -3.2 mm to +3.2 mm is preferable, -1.6 mm to +1.6 mm is more preferable, -0.8 mm to +0.8 mm is even more preferable, and -0.4 mm to +0.4 mm is even more preferable.

[0049] That is, the moisture content measuring device according to the first embodiment of the present invention may output the moisture content of the sludge when the distance variation measured by the distance sensor 3 is within a predetermined range set in advance. In this case, from the viewpoint of measurement accuracy, as the range of the predetermined distance variation, a range from -3.2 mm to +3.2 mm is preferable, a range from -1.6 mm to +1.6 mm is more preferable, a range from -0.8 mm to +0.8 mm is even more preferable, and a range from -0.4 mm to +0.4 mm is even more preferable.

[0050] When the distance variation is outside the predetermined range set in advance, the measurement result of the moisture content may not be output. When the distance variation is outside the predetermined range set in advance, the moisture content measured last time may be output.

[0051] In the first embodiment, an example is shown in which the infrared measurement unit 2 irradiates infrared rays to measure the moisture content of the dehydrated sludge. However, the moisture content may be measured with light having a wavelength other than infrared rays (for example, mid-infrared rays, etc.), and the moisture content of the dehydrated sludge may be measured based on the optical information irradiated on the dehydrated sludge.

[0052] According to the moisture content measuring device according to the first embodiment of the present invention, by correcting the optical information measured by the optical sensor based on the distance information measured by the distance sensor 3, it is not necessary to construct a plurality of regression equations in advance. Therefore, while suppressing an increase in the man-hour for constructing a regression equation for converting the optical information measured by the optical sensor into the moisture content, the moisture content of the dehydrated sludge can be measured with high accuracy regardless of the change in the distance between the dehydrated sludge as the measurement object and the optical sensor.

[0053] <<Second Embodiment>> The moisture content measuring device according to the second embodiment of the present invention will be described. The moisture content measuring device according to the second embodiment has differences from the moisture content measuring device according to the first embodiment only in the following points. · In the water content measuring device according to the second embodiment, the distance sensor 3 is an optical distance sensor, and the wavelength range of the light irradiated from the distance sensor 3 is different from the wavelength range of the light used in the optical sensor.

[0054] Hereinafter, the description will focus on this difference.

[0055] As described above, FIG. 2 is a diagram showing an example of the infrared measurement unit 2 and the distance sensor 3, and its details were described in the first embodiment. In the second embodiment, an example will be described in which light of a near-infrared wavelength is irradiated from the irradiation light probe 21, and the distance sensor 3 is an optical distance sensor.

[0056] An optical distance sensor can measure the distance (or displacement) by irradiating light on the dehydrated sludge that is the measurement target and measuring the reflected light. When the wavelength range irradiated and received by the optical distance sensor overlaps with the wavelength range irradiated from the irradiation light probe 21 of the infrared measurement unit 2, it has been found that the light irradiated from the optical distance sensor to the measurement target and reflected from the measurement target may enter the light receiving probe 22 of the infrared measurement unit 2, and the accuracy of measuring the water content may decrease. On the other hand, when the wavelength range used for the distance sensor 3 is different from the wavelength range used for the infrared measurement unit 2 (optical sensor), the water content can be measured without degrading the accuracy.

[0057] In the infrared measurement unit 2 in the second embodiment, near-infrared light in the wavelength range of 800 nm to 2400 nm is irradiated from the irradiation light probe 21, and the wavelength range of 1200 nm to 2200 nm among the light received by the light receiving probe 22 is used for measuring the water content. Therefore, the wavelength range used for the distance sensor 3 is preferably different from the wavelength range used in the infrared measurement unit 2, more preferably does not include the wavelength range of 800 nm to 2400 nm, and even more preferably does not include the wavelength range of 1200 nm to 2200 nm.

[0058] In the above-described second embodiment, an example was shown in which the infrared measurement unit 2 irradiates near-infrared rays to measure the moisture content of dehydrated sludge, and an optical distance sensor is used for the distance sensor 3. However, the infrared measurement unit 2 may measure the moisture content using light with a wavelength other than near-infrared rays (for example, mid-infrared rays, etc.). In that case, the wavelength region used for the optical distance sensor may be different from the wavelength region used by the infrared measurement unit 2.

[0059] <<Modification Example>> Note that the present invention is not limited to the above-described embodiments, and various modification examples are included. For example, each of the above-described embodiments has been described in detail for easy understanding of the present invention, and is not necessarily limited to those including all the configurations described. Also, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can also be added to the configuration of one embodiment. Also, any addition, deletion, or replacement of a part of the configuration of each embodiment can be applied alone or in combination.

[0060] For example, in each of the above embodiments, the measurement object may be other than sludge. In each of the above embodiments, the method for correcting the infrared information is not limited to the above example, and the formula for correcting the infrared information is not limited to the above example.

[0061] Also, each of the above configurations, functions, processing units, and processing means, etc. may be realized in hardware, for example, by designing a part or all of them with an integrated circuit. Also, each of the above configurations and functions, etc. may be realized in software by a processor interpreting and executing a program for realizing each function. Information such as a program, table, and file for realizing each function can be stored in a memory, a recording device such as a hard disk or an SSD (Solid State Drive), or a recording medium such as an IC card, an SD card, or a DVD.

[0062] In addition, the control lines and information lines show those considered necessary for explanation, and not all control lines and information lines are necessarily shown on the product. In fact, it may be considered that almost all components are interconnected.

Explanation of Signs

[0063] 1…Arithmetic processing unit, 2…Infrared measurement unit, 3…Distance sensor, 4…Infrared signal processing device, 5…Sludge dehydrator, 6…Moisture content display unit, 11…Processor, 12…Memory, 13…Storage device, 14…Input / output device, 15…Interface, 21…Irradiation light probe, 22…Light receiving probe, 51…Dehydration unit, 52…Sludge discharge unit, 71…Control unit, 72…Pretreatment unit, 73…Distance correction arithmetic unit, 74…Regression arithmetic unit, 75…Regression formula storage unit, 76…Distance correction formula storage unit, 81…Measurement start button, 82…Measurement stop button, 83…Correction parameter, 84…Moisture content, 85…Measurement result

Claims

Applied to a sludge dehydrator including a dehydration unit that receives sludge and discharges moisture, and a sludge discharge unit into which the dehydrated sludge with reduced moisture from the dehydration unit enters and discharges the dehydrated sludge to the outside. An optical sensor that irradiates light on the dehydrated sludge flowing through the sludge discharge unit to measure optical information. A distance sensor that measures distance information for obtaining a distance variation that is a change amount from a predetermined reference distance of the distance between the dehydrated sludge and the optical sensor. A computer that measures the moisture content of the dehydrated sludge based on the distance information and the optical information. A moisture content display unit that displays the moisture content output from the computer. A moisture content measuring device including: The computer: Based on the distance variation based on the distance information, corrects the optical information, and applies the corrected optical information to a calibration model for deriving the moisture content from the optical information to calculate the moisture content of the dehydrated sludge. When the distance variation is within a predetermined range, the moisture content of the dehydrated sludge is output to the moisture content display unit to display the moisture content of the dehydrated sludge on the moisture content display unit. When the distance variation is outside the predetermined range, the moisture content of the dehydrated sludge is not output, so that the moisture content of the dehydrated sludge is not displayed on the moisture content display unit. Configured as follows: Moisture content measuring device. Applied to a sludge dehydrator including a dehydration unit that receives sludge and discharges moisture, and a sludge discharge unit into which the dehydrated sludge with reduced moisture from the dehydration unit enters and discharges the dehydrated sludge to the outside. An optical sensor that irradiates light on the dehydrated sludge flowing through the sludge discharge unit to measure optical information. A distance sensor that measures distance information for obtaining a distance variation that is a change amount from a predetermined reference distance of the distance between the dehydrated sludge and the optical sensor. A computer that measures the moisture content of the dehydrated sludge based on the distance information and the optical information. A moisture content display unit that displays the moisture content output from the computer. A moisture content measuring device including: The computer: Based on the distance variation based on the distance information, corrects the optical information, and applies the corrected optical information to a calibration model for deriving the moisture content from the optical information to calculate the moisture content of the dehydrated sludge. When the distance variation is within a predetermined range, the moisture content of the dehydrated sludge is output to the moisture content display unit to display the moisture content of the dehydrated sludge on the moisture content display unit. When the distance variation is outside the predetermined range, the moisture content of the dehydrated sludge output last time is output, and the moisture content of the dehydrated sludge output last time is displayed on the moisture content display unit. configured as moisture content measuring device.

3. In the moisture content measuring device according to claim 1, the computer includes a storage device in which the calibration model is stored. moisture content measuring device.

4. In the moisture content measuring device according to claim 1, the computer corrects the optical information using a correction coefficient corresponding to the distance variation. configured as moisture content measuring device.

5. In the moisture content measuring device according to claim 4, the computer includes a storage device in which a correction coefficient corresponding to the distance variation is stored, the computer determines the correction coefficient corresponding to the distance variation based on the distance variation, and corrects the optical information using the determined correction coefficient. configured as moisture content measuring device.

6. In the moisture content measuring device according to claim 4, it includes a storage device in which information indicating the relationship between the correction coefficient and the distance variation is stored, the computer applies the distance variation measured by the distance sensor to the information indicating the relationship between the correction coefficient and the distance variation to determine the correction coefficient corresponding to the distance variation, and corrects the optical information using the determined correction coefficient. configured as moisture content measuring device.

7. In the moisture content measuring device according to claim 1, the predetermined range is a range from -3.2 mm to +3.2 mm. moisture content measuring device.

8. In the moisture content measuring device according to claim 1, the predetermined range is a range from -1.6 mm to +1.6 mm. moisture content measuring device.

9. In the moisture content measuring device according to claim 1, the predetermined range is a range from -0.8 mm to +0.8 mm. moisture content measuring device.

10. In the moisture content measuring device according to claim 1, the distance sensor is an optical distance sensor, and the wavelength region of the light irradiated from the optical distance sensor is different from the wavelength region of the light used by the optical sensor. moisture content measuring device.

11. In the moisture content measuring device according to claim 1, the distance information is the distance between the dehydrated sludge and the optical sensor or the displacement from a predetermined position of the dehydrated sludge. moisture content measuring device.

12. In the moisture content measuring device according to claim 1, The optical information is in the infrared spectrum. Water content measuring device.

13. It is applied to a sludge dehydrator including a dehydration unit that receives sludge and discharges moisture, and a sludge discharge unit into which the dehydrated sludge with reduced moisture from the dehydration unit enters and discharges the dehydrated sludge to the outside. An optical sensor that irradiates light on the dehydrated sludge flowing through the sludge discharge unit to measure optical information. A distance sensor that measures distance information for obtaining a distance variation that is a variation from a predetermined reference distance of the distance between the dehydrated sludge and the optical sensor. A computer that measures the water content of the dehydrated sludge based on the distance information and the optical information. A water content display unit that displays the water content output from the computer. A water content measuring method using the above. By the computer. Based on the distance variation based on the distance information, correct the optical information, and apply the corrected optical information to a calibration model for deriving the water content from the optical information to calculate the water content of the dehydrated sludge. When the distance variation is within a predetermined range, output the water content of the dehydrated sludge to the water content display unit to display the water content of the dehydrated sludge on the water content display unit. When the distance variation is outside the predetermined range, do not output the water content of the dehydrated sludge, so as not to display the water content of the dehydrated sludge on the water content display unit. Water content measuring method.

14. It is applied to a sludge dehydrator including a dehydration unit that receives sludge and discharges moisture, and a sludge discharge unit into which the dehydrated sludge with reduced moisture from the dehydration unit enters and discharges the dehydrated sludge to the outside. An optical sensor that irradiates light on the dehydrated sludge flowing through the sludge discharge unit to measure optical information. A distance sensor that measures distance information for obtaining a distance variation that is a variation from a predetermined reference distance of the distance between the dehydrated sludge and the optical sensor. A computer that measures the water content of the dehydrated sludge based on the distance information and the optical information. A water content display unit that displays the water content output from the computer. A water content measuring method using the above. By the computer. Based on the distance variation based on the distance information, correct the optical information, and apply the corrected optical information to a calibration model for deriving the water content from the optical information to calculate the water content of the dehydrated sludge. When the distance variation is within a predetermined range, output the water content of the dehydrated sludge to the water content display unit to display the water content of the dehydrated sludge on the water content display unit. When the distance variation is outside the predetermined range, the water content of the dehydrated sludge output last time is output, and the water content of the dehydrated sludge output last time is displayed on the water content display unit. Water content measurement method.

Images