JPH0238825A - Liquid color monitor - Google Patents

Abstract

PURPOSE:To provide a liquid color monitor capable of continuously performing certain, stable and rapid judgement by continuously supplying a liquid to be measured to a flow cell to continuously detecting the transmitted light of the liquid to be measured by a main color sensor. CONSTITUTION:A liquid to be measured enters the flow cell 13 of a measuring optical system 15 from the take-in port 42 of a sensor part 11 to be continuously supplied through an outflow port 44 and receives the projection of the light from a light source 14 in the flow cell 13. The light transmitted through the liquid to be measured in the flow cell 13 is guided to a main color sensor 16 by an optical fiber 19 and the output of the main color sensor 16 is inputted to a data processing part to continuously detect the color of the liquid to be measured. A part of the light of the light source 14 is guided to a color sensor 17 for reference light by an optical fiber 21 and the error generated in the main color sensor 16 by the variation in the emission quantity of light from the light source 14 can be corrected on the basis of the output of the color sensor 17 for reference light and the color of the liquid to be measured can be monitored with high accuracy.

Description

Detailed Description of the Invention [Industrial Field 1] The present invention relates to oils and fats such as edible oil, palm oil, whiskey, alcoholic beverages, and mineral oil for lubricating horses. 1. This invention relates to a liquid color monitor for continuously monitoring f.

"Prior Art" Generally, in the industrial field 4), the color of l/r liquids is measured.

For example, in the food industry, the color of food products is an important indicator of product quality in the trading of oil and fat products. For this reason, the color of edible oils has been measured.

Conventionally, this color measurement has been prescribed in JIS (11 Industrial Standards t4) K2SO3.

This method uses a Lovibond colorimeter, and the 12th
This is done as shown in the figure. That is, a liquid to be measured 2 is placed in a glass cell 1 having a predetermined optical path length a and a flat optical surface, and light from a light source 4 reflected by a white plate 3a is transmitted through the liquid to be measured 2 in the glass cell 1. . On the other hand, the light reflected by the other white plate 3b and the light from ft4 are transmitted through the standard color glass 5 which has a number of colors prepared in advance. Then, 7111 Seizan 6 points the color glass 5 to arrow A.
So, like C<0 order 1? The two transmitted lights are compared (colorimetrically) to identify the standard color glass 5 that is closest to the color of the glass 2. .

However, the colored glass 5 mentioned above is 1. It is not specified in the JIS (D-bond standard), but the colored glass used in the [1 Vibond colorimeter made by Robivoit-'+T in the UK has been used all over the world, and its If use
F is habituated.

[Problems to be Solved by the Invention] By the way, in the colorimetric method as described in F, the measurer visually compares the color of the liquid to be measured 2 and the color of the standard color glass 5. Not only does measuring the color of liquid 2 require a great deal of time and effort, it is difficult to continuously measure the color of liquid 2 to be measured, and the colorimetric method described above is difficult for human visual perception. Since this is a measurement that depends on the sensory layer, there is a problem that the measurement values vary depending on the person taking the measurement, and the same person taking the measurement in the morning and the evening, for example, may have different measurement values due to his/her mental state of deafness, etc., and the accuracy of reproduction is low. was there.

An object of the present invention is to provide a liquid color monitor that improves the conventional colorimetric method that relies on visual perception and allows reliable, stable, and rapid determination to be performed continuously.

[Means for Solving the Problems] Therefore, the present invention includes a sensor JJ- section that projects light onto a wave measurement liquid, detects the transmitted light, and converts it into an electrical signal, and a signal from this sensor section. and a data processing section that continuously detects the color of the wave measurement liquid, the sensor section being connected to an intake port and a discharge port of the wave measurement liquid, a measurement optical system that projects light from a light source onto the wave measurement liquid that passes through the flow cell; a container that houses the measurement optical system; The main force that receives light and converts it into electrical signals is
-Receives the light from the light source and converts it into electric signal 1) 4-Reference light color sensor and both color sensors 4J°
A constant temperature bath for the color sensor that accommodates the above liquid and maintains both at the same temperature condition, and a light for guiding the transmitted light of the above-mentioned main color sensor 4° to the main color sensor 4°. and a reference leading light optical fiber that guides the light from the light source to the reference light color sensor, and the main color sensor uses the output of the reference color sensor to change the amount of light emitted from the light source. It is characterized by the following characteristics: 111 force fluctuations are controlled.

1 Action 1 1 2 Limb Measurement Liquid is supplied from the intake port to the flow cell, and light from the ) source is projected. The transmitted light that has passed through the wave measurement liquid in the Flor cell is guided to the main color sensor by the transmitted guiding light optical fiber. The main color sensor detects the transmitted light incident from the transmitted guiding light optical fiber.

On the other hand, light from a light source enters the reference color sensor through the reference leading light optical fiber. This reference color sensor detects changes in the amount of light emitted from the light source.

Since the main color sensor and the reference color sensor are housed in the same thermostat for color sensors and maintained at a constant temperature, the temperature drift between the two becomes almost zero. Therefore, there is a certain relationship between the output fluctuations of the main color sensor and the output fluctuations of the reference color sensor due to fluctuations in the amount of light emitted from the light source. Therefore, the error that occurs in the output of the main color sensor due to fluctuations in the amount of light emitted by the light source is
It is possible to correct Mi using the output of the reference color sensor.

Further, if the main color sensor and the reference color sensor have substantially the same temperature drift with respect to temperature, the above-mentioned hli positive value becomes more accurate.

[Effects of the Invention] According to the present invention, the wave measurement liquid is continuously supplied to the flow cell, and the transmitted light passing through the wave measurement liquid passing through the flow cell is continuously detected by the main color sensor. The color of the wave measurement liquid can be continuously detected by the output of the color sensor, making it possible to continuously monitor the color of the wave measurement liquid.

Further, according to the present invention, the main color processor 7,
Since the f-lens color sensor 4F is housed in the same thermostat for color sensors and maintained at a constant temperature, the output of the main color sensor due to fluctuations in the amount of light emitted by the light source and the output of the reference color sensor are There is a certain relationship in terms of fluctuations, and errors that occur in the main color sensor due to fluctuations in the amount of light emitted by the light source can be corrected by the output of the reference color sensor, allowing the color of the liquid to be monitored with high accuracy. can do.

[Example] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

In the following, an embodiment will be described in which the present invention is applied to a monitor for the color of fats and oils based on the color test method for fats and oils using a Lovibond colorimeter manufactured by Lovibond Ltd. in the UK, which is specified in JIS (Japanese Industrial Standards) K2SO3.

In this embodiment, the oil color monitor device used to monitor the color of AIJOff includes a sensor unit that projects light onto the oil whose color is to be monitored, detects the transmitted light, and converts it into an electrical signal, and a sensor unit that and a data processing section that detects the color of the oil and fat that is subjected to color measurement in response to signals from the first section. The structure of the processor section is shown in FIG. 1, and the block diagram of the overall structure of the oil color monitor device is shown in FIG. 2.

The sensor section II whose configuration is shown in FIG. 1 has an appearance as shown in FIG. 3. In addition, the sensor section II shown in FIG. 2 and the data processing section 12 whose configuration is shown in FIG.
It has an appearance as shown in FIG.

The sensor section 11 is placed at a factory site where processing is carried out, such as the production of oils and fats, and the data processing section 12 is placed in a control room of the factory. Therefore, the sensor section 11 and the data processing section 12 are usually separated by about 501 to 100+, and are connected wirelessly, such as by a communication cable.

As shown in FIG. 1, the sensor section II includes a measurement optical system 15 that projects a light source beyond the light source 1 onto a flow cell 13 through which the oil and fat whose color is to be monitored passes through the frame (2-cell) 3. The main color sensor 16 detects the light transmitted through the ift digit and converts it into an electrical signal, and the main color sensor 16 receives the light (reference destination) of the light source 1 of the measurement optical system 15 and converts it into an electrical signal. Reference color sensor 1
7. A color sensor constant temperature controller 18 that maintains the main color sensor 16 and the reference light color sensor 17 under the same temperature condition; a transmission guide that guides the transmitted light of the oil flowing through the flow cell 13 to the main color sensor 16 The optical fiber 19 for light includes a reference leading light optical fiber 2I that guides the light from the light source (1) 4 to the reference light color sensor 17, and a data collection system 22.

The exterior case 23 of the sensor section II consists of an upper case 23a and a lower case 231) in two stages, upper and lower. The upper case 23a and the lower case 23b are arranged one above the other with a heat shielding plate 23c made of resin having good thermal insulation property interposed therebetween. The measurement optical system 15 is housed in the L case 23a, and the main color processor 1G, reference light color sensor 17,
A color sensor controller 7jAtff I8, a data collection system 22, and the like are accommodated.

The measurement optical system 15 includes a light fi made of a halogen lamp.
14, condenser lens 2.1, collimation lens 25
, the slit 2G and the adjustment lens 27 are arranged in this order on the optical axis (■). - It is located in the ni. A flow cell 13 is arranged between the slit 26 and the adjustment lens 27.

As shown in FIG.
Support plate 29I with both ends fixed by 8a and 28b:
be placed in That is, the light source 1 of the measurement optical system 15
・1, condenser lens 2・1, collimation lens 25
The slit 26 is accommodated within the cano jig 31 and fixed to the support plate 29. - To the light distribution fi 14, move the lamp base 32 to the arrow A to replace its halogen lamp.

As shown in 4-, it is detachably attached to the cano jig 3I. The lead wire 33 drawn out from the pump base 32 is connected to the upper case 23a1. , : one end provided is connected to the F-plate 31.

Ll: The adjustment lens 27 of the optical system 15 is accommodated in another γ-nojig 35 and fixed to the support plate 29 in 1-. A constant temperature bath 36 is attached to the attachment/detachment port t[ as shown by the arrow 4 between the two cano jigs 31 and 35. The flow cell 13 is housed within this constant temperature bath 36 . In order to replace the internal flow cell 13, it can be separated into a base portion 36a and a cover portion 36b.

As shown in FIG. 1, a thermal conductor 37 is disposed in the thermostatic chamber 36 in contact with the flow cell 13, and this thermal conductor 37 is equipped with a heater I-11 and a temperature sensor S.
1 is included. The heater HI and the temperature sensor St are connected to a temperature indication controller 38a, and the temperature indication controller 38a controls the heater 1 so that the temperature inside the thermostatic oven 36 detected by the temperature sensor S1 is constant. (Electrification to 1 is controlled. As shown in FIG. 5, these three lead wires of heater il+ and temperature 11 setter S1
Connected to 1.

Note that this constant temperature bath 36 is equipped with a 7111 ti that monitors the color.
It is not used to keep the temperature constant, but is used to measure the color of -J1 fats such as fish oil, which solidify at room temperature and become liquid at temperatures above 50°C or 60°C.

That is, when measuring the above-mentioned color of I'llJ pilgrimage, which assimilates at room temperature, the temperature of the constant temperature bath 36 should be set to a temperature slightly higher than the temperature at which fats and oils solidify. This results in
If the flow of the oil or fat stops, or if the monitoring device stops because the factory is on holiday, etc., the oil or fat will solidify in the flow cell 13.The flow cell 13 in the thermostatic chamber 36 should preferably have both ends or a flat surface. As shown in Figures 5 and 6, the cylindrical cedar-shaped groove that became the optical part is connected to the intake port 12 for collecting oil and fat for monitoring the color.
I asked B to connect with Vibrator 13, I:,:self] [
In order to discharge the oil and fat that has passed through the J-cell I3, it is connected to #'I discharge port 1.1 by a vibrator 15.

, FIG. 6 shows the oil inflow port 13a and the oil inflow port 13a provided in the flow center 13 described in -.
・12 is connected by bell 13, and is also installed in the flow cell 13 described below.
: 3b is connected to the oil discharge port 44 (it is also shown that a vibrator 45 is connected).

As shown in FIG.
A light projection hole 36 for projecting light to the flow cell I3 of No. 5
c, and sh in the flow cell 13 from this light projection hole 36c.
There is a lead-out hole 36d for leading out the transmitted light that has passed through the QFt.

Light emitted from the light source l.1 of the measuring optical system I5 is condensed by the condenser lens 2.1. The condenser lens 2.1 includes an infrared cut filter 16 that removes infrared components from the light from the light source 14 and transmits only visible light.

The light that exits the L condenser lens 24 passes through the collimator lens 25 and becomes downward light.

A slit 26 for punching a slit hole is arranged after the collimator lens 25. The number of ten lines passing through the slit hole of this slit 26 is 1-.

It enters the flow cell I3 in the constant temperature bath 36. ] [The light that enters the 1-cell 13 is absorbed by the Alt fat that continuously flows through the a-cell 13, and a specific color is absorbed by the light absorbing property of the oil, and reaches the adjustment lens 27. do.

This adjustment lens 27 is composed of a convex lens, and transmits the transmitted light of the flow cell 13 to the optical fiber 1 for guiding light.
Project to one end of 9. The adjustment lens 27 has an optical axis. It is movable as shown by arrow A4 above, and its position is adjusted so that the transmitted light of the flow cell I3 is always imaged to a constant size on one end of the transmitted guiding light optical fiber 19.

The other end of one of the transmission guiding light optical fibers is fixed opposite to the light receiving section of the main color sensor 16.

By the way, the sensor unit 11 is installed in a factory where dust, oil mist, etc. are floating. Since it is a processing site where raw fat is produced, the measurement optical system 15 mentioned above is used.
The -L case 23a of the outer case 23 in which the -L case 23a is housed is hermetically sealed from the outside. 4-Also, the above upper case 2
3a is provided with a supply port 47 for I)++ pressurized air to supply pressurized air, and to increase the pressure inside the case 23a by several degrees above atmospheric pressure. ,'' This is to prevent dust, oil mist, etc. from entering into the case 23a, and to protect the measurement optical system 15. The pressurized air supplied into the upper case 23a also circulates inside the case 23a to cool the inside of the case 23a, and then is discharged from the air outflow valve 48.

On the other hand, the main color sensor 16 detects the change in the light amount of the light source 14 of the measurement optical system 15, and detects the change in the light amount of the light source 14.
In order to correct changes in the amount of measurement light entering the sensor, a part of the light from the light source 14 that has passed through the infrared cut filter 49 is guided to the reference light color sensor 17 through the reference leading light optical fiber 21. .

The reference light color sensor I7 is of the same type as the main color sensor 16, and uses a photoelectric conversion element, such as a photodiode, which has approximately the same temperature characteristics. The color sensor 17 is attached to the heat conductor 11750 and is thermally coupled to each other so that the temperature conditions are the same as that of the main color sensor 16.
6. The reference light color sensor 17 and the heat conductive plate 50 are further housed in the color sensor constant temperature bath 18. This is to make the temperature drift of the output of the reference light color sensor 17 and the temperature drift of the output of the main color sensor 16 relative to the same human light to almost zero under the same temperature conditions.

A heat conductor 50a is also arranged in the color sensor constant temperature 15J18 in contact with the heat conduction plate 50, and this heat conductor 50a includes a heater I-12 and a temperature sensor S2.
is included. These heaters 112 and temperature sensor S2 are connected to a temperature instruction controller 38b, and the temperature instruction controller 38b controls the temperature inside the color sensor constant temperature bath I8 detected by the temperature 1y sensor S2 to be constant. . In addition, the temperature chamber 1 for the main color sensor mentioned above
The temperature inside the sensor section 8 is set to be slightly higher than the ambient temperature at the installation site where the sensor section 11 is installed. For example, if the maximum atmospheric temperature at the site where the processor unit 11 is installed is 40°C, 45°C to
Set it to about 50℃, adjust χ・l according to the change in ambient temperature,
Constant temperature for color sensor! The temperature inside 18 can be controlled to be constant.

The above-mentioned color sensor constant temperature bath 18, temperature indicator controller 38a
, 38b, the data collection system 22 is housed in the lower case 23b of the outer case 23 of the sensor section 11. This lower case 23b has a fifth
As shown in the figure, an air cooling fan F is attached to which the filter Pa is fixed by the filter cover Pb.

The main color sensor I6 detects the n (red), G (green) and 13 (Nr) components of the received light as shown in FIG. 5+11. The R signal, G signal, 1, and B signal are output to the G signal amplifier 51Grj and the B signal amplifier 51r1, respectively.

The color sensor 17 for reference light detects the 1 (red), G (green), 31; A signal amplifier 521 (respectively outputs R signal, G signal, and I signal for reference).

The data collection system 22 receives the R signal up 5111 on the main color sensor 16 side. Glc? No. Amplifier 51G1 [3
Signal amplifier 51 [3, reference light color sensor 1
7 side R signal amplifier 52fl, G signal amplifier 52G, 1
3 signal amplifier 52B1 multiplexer 53 and A/D
It consists of a converter 54.

The multiplexer 53 outputs each of the R signal amplifier 51R, G signal amplifier 51G, and B signal amplifier 51B1 on the main color sensor 16 side, and the R signal amplifier 52rt, G signal amplifier 52G, and B signal amplifier 52B on the reference light color sensor 17 side. are sequentially and time-divisionally output to the A/D converter 54 at the next stage. This A/I converter 54 converts the signal (analog signal) input from the multiplexer 53 into a digital signal, and sends it to the next data processing section I.
Output 4 to 2.

The data processing section 12 includes an arithmetic control section 55, a data storage section 56, a memory 57, a human interface 58, an output interface 59, a keyboard 61, an external communication port 62, a display 63, a printer 64, and the like.

The calculation control section 55 includes a calculation section 55a and a control section 55b, and is configured by a microprocessor. The details of the function of the arithmetic control section 55 will be explained later in conjunction with the algorithm for measuring the color of fats and oils shown in FIG.

The data storage section 56 stores R signal amplifiers 51R and 51G on the main color sensor 16 side, which are converted into digital signals and input from the A/D converter 54 to the external communication port 62.
Signal amplifier 51G, R signal amplifier 52 on the reference color sensor 17 side of each output of the three signal amplifiers 51B
fl, G signal amplifier 52 This is a buffer memory that temporarily stores each output of the GSB signal amplifier 52B.

On the other hand, the memory 57 stores calculated values calculated by the calculation control unit 55 based on the respective outputs stored in the data storage unit 56 for a plurality of oil and fat samples. −
The memory 57 also has J]S (Japanese Industrial Standards r6) K
The measurement data Y0 and Ro of the plurality of colorimetric samples are stored, which are measured using a Lovipont colorimeter manufactured by Lovibond Ltd. in the United Kingdom as specified in 3503. That is, the memory 57 has h
Regarding the oil and fat sample, to the calculation control unit 55. l: Calculated foot temperature and measurement data using a Lovibond colorimeter.

The inspection line is stored without showing the correspondence between R8 and R8.

Measurement data Y and R8 by the above Robitento colorimeter
is entered using the keyboard 6I.

The human power interface 58 converts the output of the keyboard 6I and the external communication port 62 into a let number that can be imported into the arithmetic control section 55 and data storage section 56.

In addition, the output interface 59 includes performance, control and
'1 (Converts the signal output from 55 into a signal for display on the display 63 and a signal for printing out by the printer 6□1.

Note that the control gII section 551) of the arithmetic control section 55 outputs control signals to the data collection system 22 and the data processing section 12.

In order to continuously monitor the color of the oil, the processor section 11 of the oil color monitoring device described above has an oil intake port 42 and an exhaust port 44 arranged as shown in FIG. 7. That is, the intake port 42 is connected to a switch ff-74 that switches between the sample container 71 containing the oil sample and the main pipe 72 through which the oil and fat being processed flows, as is typical of JJJ construction. In addition, i of the sensor section II
+I+ The fat discharge port 44 is connected to a pump 74 that flows fat and oil into the flow cell 13 . And this pump 7
The outlet side of 4 is connected to a switching valve 76 that switches between the main pipe 72 and the waste liquid container 75 from which the sample is discharged during calibration, which will be described later.

A manual valve 77 is provided between the switching valve 73 and the main pipe 72.
and the deaerator 78 are connected. Further, a manual valve 79 and a check valve 81 are connected between the other switching valve 76 and the main pipe 72.

Next, the operation of monitoring +111 fat by the monitor device described above will be explained with reference to FIG.

[Calibration (Calibration month) First, prepare a calibration standard solution and inject it into the sample container 71.

Next, set the switching valve 73 in FIG. 7 to the sample container 71 side,
Also, after setting the switching valve 76 to the waste liquid container 75 side, the pump 7
4. Apply electricity. As a result, the calibration standard solution in the sample container 71 flows as shown by arrow A in FIG. 9, and the calibration standard solution flows into the blow cell +3. Regarding this calibration standard solution, the R (red), G (green), and B (blue) components of the transmitted light are measured using the monitor device shown in FIG.

R signal amplifier 5 on the reference light color sensor 7 side
2fl, G signal amplifier 52G and B signal amplifier 521
3, the operation control unit 55 of the data processing unit 12
The calculation unit 55a calculates I'? of the transmitted light of the calibration ring V liquid.
, G and B components, the light source 1 of the measured value
The error due to the change in the amount of light in step 4 is corrected by hlt.

Next, - R2O and l of the transmitted light of the above calibration standard solution]
Add the acid component supplementary 1E values to Ro, Go, and B, respectively. It is stored in the memory 57 as .

From now on, in the measurement operations during calibration curve creation and monitoring, R8, Go and B1. The following (1
) to (3) are used for correction.

fl=lOOX, -(+) G=100x□ (2) This operation can correct errors caused by cell IP deviation and long-term aging of the light source.

[Creating a calibration curve] First, prepare n oil samples for creating a calibration curve.
Prepare (#1).

Each of these nu samples? Tips 1. JrSCE
J Industrial Standards F8) Using a Lovibond colorimeter (optical path length of glass cell 1: 133.4 iz) specified in K2SO3, calculate the value Y of standard color glass 5 (see figure '5512),
Find L (#2).

On the other hand, the sample container 7! side,
Further, after the switching valve 76 is set to the waste liquid container 75 side, the pump holder is energized. As a result, the sample in the sample container 71 flows as shown by the arrow A11 in FIG. 9, and one of the n oil and fat samples flows into the blow cell +3. For each of these n fat samples,
The R (red) and G of the transmitted light are measured using the monitor device shown in Figure 2.
(green) and B (blue) components (#4). R signal amplifier 5211 on the reference color sensor 17 side
, G (No. 3 amplifier 52G and B signal amplifier 5213
According to the output of 14, the error due to the change in light amount is corrected. Furthermore, errors caused by dirt on the cell, long-term changes in the light source, etc. are corrected using equations (+) to (3).

nG and [3
Based on the corrected values of the components, using the following equations (4) to (11), which were experimentally determined from the analysis of the standard color glass of the Lovina colorimeter and the analysis data of various oil and fat samples, etc. A first-order transformation (Lovibond transformation) is performed to calculate the Y' value corresponding to the yellow component of the fat and the R° value corresponding to the red component of the fat (#5 and #6).

11°=0.9511+0.051'3
(4) G'=0.31? +0.7G・
・(5) B'=0.2G+0.8G ・
(6) It"=(R'/100)"3 ・
・(7) G″=(G′/100)1/3 B″−(r3°/10(1)j/3 ・・(8) ・(9) ■( (4) to (11) above) The calculation of the expression is performed by the data processing unit 12.
The calculation unit 55a of the calculation control unit 55 executes the calculation.

Next, the value Y of the ng sample was measured using a Lovibond colorimeter. , It, and the above-mentioned Y° value and Il' value, a first line showing the correspondence relationship between the two is created (#7). This calibration curve is stored in the memory 57 of the data processing section 12.

Note that a method such as the least squares method can be used to determine the above-mentioned test m-line.

This completes measurement Q and va.

[Sample Discharge] Next, the switching valve 73 in FIG. 7 is switched to the main pipe 72 side, and the manual valve 77 is opened. As a result, in FIG. 10, the arrow AI! As shown, the oil in the main pipe 72 flows and pushes out the oil sample that was in the flow cell 13 at the time of creating the calibration curve into the waste liquid container 75.

[Monitor] Next, when the discharge of the sample is finished as described above, the switching valve 76 is switched to the main pipe 72 side and the manual valve 79 is opened. As a result, in FIG. 1I, arrow A,
3, the oil and fat in the main pipe 72 flows, and a part of the oil and fat flowing in the main pipe 72 continuously flows into the flow cell 13 (#3). The RlG and B components of the transmitted light of this oil and fat are measured (1).

Below, for the sample nu in creating the calibration curve, the Y' value [(of the oil sample passing through the flow cell is calculated by performing the exact same correction and calculation as the value) ' value and R° value (#5
．． #6).

From these Y° and R° values and the calibration curve obtained by creating the calibration curve above, calculate the Y value and R value, which are the monitor values (#7
#8).

These Y values and R values are calculated by the data processing unit 12
3 and can also be printed out on the printer 64. Further, if the above Y and fl values deviate from a specified range, an alarm can be issued.

It can be seen that if a calibration curve is created using a plurality of samples in this manner, unknown oil and fat samples can be easily monitored continuously without relying on the human H3I's visual sense.

In addition to monitoring the color of oils and fats, the present invention can also be used to monitor the ripeness of foods such as soy oil, whiskey, and alcoholic beverages, and to monitor the quality of lubricating oils and mineral oils in the production process. Can be monitored.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the configuration of a sensor section of an embodiment of a liquid color monitor according to the present invention, FIG. 2 is a system configuration diagram of a liquid color monitor having the sensor section of FIG. 1, FIG. Figure 4 is a perspective view showing the external appearance of the sensor part and data processing part of the liquid color monitor shown in Figure 2, Figure 5 is an exploded perspective view of the sensor part, and Figure 6 shows details of the flow cell and thermostatic chamber part 5. Figure 7 is a connection diagram of the piping of the sensor unit; Figure 8 is an explanatory diagram of the algorithm for monitoring the oil color using the liquid color monitor in Figure 2; Figures 9, 1O, and Fig. 11 is an explanatory diagram of the flow path of fats and oils when monitoring the color of fats and oils using the liquid color monitor shown in Fig. 2, and Fig. 12 is the measurement source Pl of the color of fats and oils using a conventional colorimeter. FIG. 11 - Sensor section, 12... Data processing section, 13
・Flow cell (13a・inflow port, +3b...outflow port), 15・measurement optical system, I6...main color sensor, 1
7 Color processor for reference light, 8... Constant temperature chamber for color sensor, 9... Optical fiber for transmitted leading light... Optical fiber for reference leading light, 2... Data collection system.

Claims (1)

[Claims] (1) A sensor unit that projects light onto the liquid to be measured, detects the transmitted light, and converts it into an electrical signal, and data processing that continuously detects the color of the liquid to be measured based on the signal from this sensor unit. A liquid color monitor consisting of a sensor section, the sensor section comprising:
a measurement optical system having a flow cell through which a liquid to be measured passes through which is connected to an intake port and an outlet port of a liquid to be measured, and which projects light from a light source onto the liquid to be measured passing through the flow cell; A container that houses a measurement optical system therein, a main color sensor that receives transmitted light from the liquid to be measured and converts it into an electrical signal, and a reference light color sensor that receives light from the light source and converts it into an electrical signal. , a constant temperature bath for color sensors that accommodates both of these color sensors and maintains both at the same temperature condition, and an optical fiber for transmitted guiding light that guides the transmitted light of the liquid to be measured to the main color sensor. , and a reference light guiding optical fiber that guides the light from the light source to the reference light color sensor, and the output of the reference light color sensor corrects output fluctuations of the main color sensor due to fluctuations in the amount of light emitted from the light source. A liquid color monitor characterized by: