KR100875963B1 - Content measuring apparatus and measuring method - Google Patents

Abstract

A concentration measuring apparatus and method are provided to read variations in red, green and blue by using a color sensor to improve measurement accuracy and achieve rapid measurement by using a white light obtained from mixture of red, green and blue lights. A concentration measuring apparatus includes a sample part(20) having a sample to be measured, a light source(10) emitting light to the sample part, a light-receiving sensor(30) for converting the light into an electric signal, a computing unit(50) for calculating the concentration of an object, and a display unit(80) for displaying the calculated concentration.

Description

Concentration measuring device and its measuring method {content measuring apparatus and measuring method}

The present invention relates to a concentration measuring apparatus and a measuring method thereof, and more particularly to a concentration measuring apparatus capable of measuring a concentration of multiple items and a measuring method thereof.

In general, in order to measure the concentration of the sample, a method of determining the concentration of the sample by inputting an indicator according to the process test method and estimating the color difference is mainly used.

This technique can be applied to various fields, for example, environmental diagnosis, painting state diagnosis and medical diagnosis.

Here, through the environmental diagnosis can be measured the concentration of the desired sample in the water quality, air, soil, etc., the coating state diagnosis is a color difference meter (色差 計) to measure the difference in color, and the medical diagnosis is a body fluid It can be applied to the measurement of the concentration of components and the urine glucose strip test.

In this way, an absorbance meter using the absorbance method is widely used.

On the other hand, such an absorbance measuring device using an absorbance method is generally required to be made of a plurality of light emitting diodes that emit light of a specific wavelength, such a light emitting diode is not only expensive, but also applicable to a portable small measuring device. In this case, there was a problem that the measurement of multiple items was impossible.

For example, in order to measure the concentration of bodily fluid components in order to estimate the concentration of constituents of specific targets of biological tissues, a band that effectively cancels the influence of interference materials as well as the wavelength that best responds to the component to be measured. There is a need for a reference light source of the, there is a problem that the price is expensive by using a plurality of light emitting diodes (LED) as such a light source.

In addition, when diagnosing water quality, five to six items of particular importance could be measured by light emitting diodes (LEDs) having different wavelengths.

In addition, there is a problem that water quality measurement, such as a river is difficult to be made in real time on the site, such as to be carried to a place such as a laboratory equipped with an analyzer for analysis rather than the measurement is made in the field.

In the conventional absorbance method, it takes a long time to obtain a result, and a lot of manpower required for measurement is required.

In addition, the conventional absorbance method is not easy to apply the reflected light used for the analysis of the sample in the form of a strip or solid form, as well as the liquid form of the sample, it is difficult to apply the market due to the high price.

Therefore, there is a demand for a measuring device capable of carrying out measurement of multiple items with economical size and weight so that the diagnosis can be carried out in the field in real time while maintaining a reliable measurement value.

In order to solve the above problems, the technical problem to be achieved by the present invention is to provide a concentration measuring apparatus capable of measuring the concentration of multiple items and a measuring method thereof.

In order to achieve the above technical problem, the present invention comprises a sample unit including a sample to be measured; A light source unit for irradiating light to the sample unit; A light receiving sensor unit collecting light emitted from the sample unit and converting the collected light into an electrical signal; The electrical signal is generated as a first order intermediate value represented by x, y, and z by a color coordinate system based on an XYZ tristimulus value, and is converted from the first order intermediate value through a conversion algorithm and a Lu'v 'color coordinate system. A second intermediate value expressed by 'is generated, and is numerically converted from the second intermediate value to a conversion value expressed by y through the conversion algorithm, and the converted value is contained in the sample from the target material to be read. Including the standard conversion value derived corresponding to each measurement item to be measured and the concentration value corresponding to the standard conversion value to be compared with the previously stored standard data, but the standard data is made of linear data The concentration value corresponding to the standard conversion value is calculated as the concentration of the target substance, and when the standard data consists of nonlinear data, A calculation unit configured to calculate a concentration value present in a concentration range corresponding to any one of a reference value of an RGB to be converted into the electrical signal as the concentration of the target material; And it provides a concentration measuring device comprising a display unit for displaying the concentration calculated by the calculating unit.

Here, the sample is preferably made of at least one of a liquid sample, a solid sample, and a color difference sample having a color difference according to its own concentration without the indicator added.

The light source unit may include a red light emitting diode, a green light emitting diode, and a blue light emitting diode, and the light emitted from the light source unit may be white light obtained by mixing respective light emitted independently from each light emitting diode.

In addition, the white light is controlled to white when the power is applied when the sample is not inserted, and the light emitting diodes are controlled and initialized based on a predetermined RGB value and a pulse width modulation ratio. This is preferable.

The light receiving sensor unit may include a color sensor for dividing the collected light into three elements of RGB, and converting the light into an electrical signal by numerically dividing the concentration of each element.

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The light source unit, the light receiving sensor unit, the calculating unit, and the display unit may be controlled by a control unit, and the control unit may further be connected to an input unit for changing an item to be measured in the sample.

In addition, the present invention comprises the steps of irradiating a sample portion including a sample to be measured by the white light made by mixing each light emitted independently from the red light emitting diode, the green light emitting diode and the blue light emitting diode; Collecting light irradiated to the sample unit and dividing the light into three RGB elements, and converting the density of each color element into an electrical signal; The electrical signal is generated as a first order intermediate value represented by x, y, and z by a color coordinate system based on an XYZ tristimulus value, and is converted from the first order intermediate value through a conversion algorithm and a Lu'v 'color coordinate system. A second intermediate value expressed by 'is generated, and is numerically converted from the second intermediate value to a conversion value expressed by y through the conversion algorithm, and the converted value is contained in the sample from the target material to be read. Including the standard conversion value derived corresponding to each measurement item to be measured and the concentration value corresponding to the standard conversion value to be compared with the previously stored standard data, but the standard data is made of linear data The concentration value corresponding to the standard conversion value is calculated as the concentration of the target substance, and when the standard data consists of nonlinear data, Allowing the concentration value existing in the concentration range corresponding to any one of the reference values of the RGB to be converted into the electrical signal to be calculated as the concentration of the target material; And it provides a measuring method of the concentration measuring device comprising the step of displaying the calculated concentration.

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Referring to the effect of the concentration measuring device and the measuring method according to the invention as follows.

First, the color sensor is divided into three elements of red, green, and blue directly from the collected light after being irradiated from the light source and passed through or reflected from the sample, thereby reading a change in each color, thereby improving measurement accuracy.

Second, since the white light which is mixed with each other after being independently emitted as red, green, and blue light is used as the input light emitted from the light source unit, the irradiation time can be shortened, and thus, a quick measurement can be made.

Third, white light in which three kinds of light are mixed is used as an input light, and the color sensor directly reads a change in color of red, green, and blue from the white light, thereby reducing the parts required for reading.

Fourth, since the standard data according to the measurement items and indicators are stored in advance, not only any sample represented by the color difference can be measured, but also, it is possible to measure the concentration of multiple items.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention in which the above technical problem can be specifically realized will be described with reference to the accompanying drawings.

1 is a block diagram showing a schematic configuration of a concentration measuring apparatus according to an embodiment of the present invention, Figure 2 is a measurement step when the standard data of the concentration measuring apparatus according to an embodiment of the present invention is a general linear data 3 is a table showing a comparison of measured values of the comparative example and the embodiment when the standard data of the concentration measuring apparatus according to the embodiment of the present invention is linear data, and FIG. It is a graph which shows the standard data of a comparative example and an Example.

First, as shown in Figures 1 and 2, the concentration measuring device preferably comprises a light source unit 10, the sample unit 20, the light receiving sensor unit 30, the calculation unit 50 and the display unit 80. Do. Here, the sample unit 20 includes a sample to be measured, and the light source unit 10 preferably emits white light onto the sample unit 20. In addition, the white light irradiated to the sample unit 20 is preferably collected by the light receiving sensor unit 30. In this case, the light receiving sensor unit 30 preferably converts the collected light into RGB (red: red, green: green, blue: blue) and converts the color into an electrical signal. The electrical signal converted as described above is numerically converted into a converted value by the calculation unit 50 and contrasted with the previously stored standard data, and the concentration of the target substance contained in the sample to be read is calculated to the display unit 80. It is preferred to be displayed. As described above, by collecting the white light irradiated to the sample unit 20 and directly dividing the light into three RGB elements, the change of each color can be read, thereby obtaining a highly reliable measurement value. In addition, since the standard data is stored in advance according to the measurement item and the indicator, any sample expressed by the color difference can be measured, and the concentration measurement of multiple items becomes possible.

In detail, the sample unit 20 preferably includes a sample containing a target material to be measured.

Here, the sample unit 20 may include a cell 22 in which a sample is accommodated, and a cell holder 25 to which the cell 22 is coupled.

The sample may be made of any one of a liquid sample, a solid sample, and a color difference sample.

First, the liquid sample may be defined as a liquid sample formed by mixing a target solution (for example, measuring water) and an indicator to be measured.

In addition, the indicator is preferably a coloring reagent, and the coloring reagent may be a conventional coloring reagent that reacts with a specific substance to develop color.

The indicator is preferably appropriately selected to correspond to the target material contained in the target solution to be measured. For example, when the user wants to measure the chemical oxygen demand in the target solution, When the indicator is selected and the phosphorus phosphorus is to be measured, the indicator may be selected by selecting an indicator for measuring the phosphoric acid phosphorus.

In addition, the solid sample may be defined as a sample made of a strip or other forms of solids or a sample including a solid.

In addition, the color difference sample may be defined as a sample having a color difference for each concentration even if the indicator is not added, the liquid sample or the solid sample or a sample in the form of a mixed liquid sample and a solid sample. May also be defined.

As such, since the sample may be made of at least one of a liquid sample, a solid sample, and a color difference sample, measurement of turbidity, concentration of suspended solids (SS), or chromaticity of a coating such as paint may be possible.

On the other hand, the cell holder 25 to which the cell 22 is fixed is not limited to any particular shape as long as the cell 22 can be fixed while preventing the smooth input of the input light emitted from the light source to be described later. It may have a shape (for example, the shape of a hole, the shape of a tongs, etc.).

The sample part 20 which can be formed in this way is preferably made to block the inflow of light from the outside, for this purpose, the sample part 20 is provided inside the dark room, or the sample part 20 itself It can be made including a dark room.

In addition, the sample unit 20 may be automated so that a sample may be automatically introduced into the cell 22 or the cell 22 in a state where the sample is inserted may be automatically mounted to the cell holder 25. It may be.

On the other hand, one side of the sample unit 20 is preferably provided with a light source unit 10 for emitting light.

The light source unit 10 may include a red (R) light emitting diode (LED) 12, a green (G) light emitting diode 14, and a blue (B) light emitting diode 16. It is preferably made to include.

In addition, each of the light emitting diodes 12, 14, and 16 preferably emits light of R, G, and B independently, and the three types of light emitted from each of the light emitting diodes 12, 14, and 16 are It is mixed to produce white light.

Each of the light emitting diodes 12, 14, and 16 is controlled based on a pre-stored RGB specific value and a pulse width modulation (PWM ratio) when the power is turned on when no sample is inserted. Preferably performed.

At this time, the pre-stored RGB specific value and the pulse width modulation ratio are irradiated with light emitted from each of the light emitting diodes 12, 14, and 16 into the sample portion into which the distilled water is inserted. An RGB specific value stored in a flash memory, in which the distilled water is removed and the pulse width modulation ratio is applied can be obtained by a blank test stored in the flash memory.

The pulse width modulation ratio may be determined based on the RGB output value of the color sensor 31, which will be described later, and the intensity of the RGB light may be controlled by controlling the pulse width modulation ratio.

Through this process, each of the light emitting diodes 12, 14, and 16 may be controlled by a color controller and a current controller (CC) which may be further provided in the light source unit 10. The measurement error according to the temperature and the characteristics of each of the light emitting diodes 10, 12, and 14 may be minimized.

And, through this, even if a minute error occurs in the color of the light emitted according to the difference in the minute current imparted to each of the light emitting diodes (12, 14, 16) or the state of the light emitting diodes (12, 14, 16) As a result, the colors can be properly combined to complement each other, thereby enabling the generation of more stable white light.

In addition, by using the white light generated as an input light, it is possible to shorten the irradiation time, and thus to quickly measure, as well as to calculate a more stable measurement value according to the emission of a stable input light.

Each of the light emitting diodes 12, 14, and 16 may be used without being replaced according to a sample or a target material to be measured, and thus, various measurements of multiple items may be performed.

Of course, the white light is most preferably applied as the input light emitted from the light source unit 10, but the input light may be formed in a specific color generated by individually adjusting the light emitting diodes 12, 14, and 16, respectively. Do.

Each of the light emitting diodes 12, 14, and 16 is one of diodes emitting light when a current flows, and a light emitting diode used as a light source in the optical communication field may be used.

The light source unit may be a monochromatic light source provided with a light emitting diode (white LED) emitting white light.

Meanwhile, the input light is emitted from the light source unit 10 so that the input light is received by the sample unit 20 so that the light emitted from the light source unit 10 can be effectively radiated to the sample unit 20. It is preferably provided to be located on the same line as the portion to be.

In addition, when the cell 22 is positioned in the cell holder 25, the periphery of the cell 22 may be completely blocked so that light emitted from the light source 10 may not penetrate the cell 22.

In addition, the cell 22 is limited to an appropriate shape (eg, round shape, square shape, etc.) and material or size so that interference can be minimized, such as minimizing the refraction of light passing through the cell 22. It can be formed without this.

As such, the input light irradiated to the sample part 20 passes through the sample part 20 or is reflected to have a specific color and is collected by the light receiving sensor part 30.

Here, the light receiving sensor unit 30 may include a collection sensor (not shown) in which input light is collected and a color sensor 31 converting the collected input light into an electrical signal.

The collection sensor and the light source unit 10 may be positioned to face each other. In this case, the light source unit 10 and the collection sensor may be installed on the same center line.

Of course, even if the position of the collection sensor and the light source unit 10 is changed does not cause a decrease in function such as light reception, the light receiving sensor unit 30 and the light source unit 10 is not limited to any particular position to be installed in various positions It may be.

That is, the light receiving sensor unit 30 and the light source unit 10 are positioned at a predetermined angle, or the light receiving sensor unit 30 is positioned at the side of the light source unit 10 to one side from each center line. It is also possible to be provided biasedly.

In this case, a separate component such as a reflector may be further provided to reflect the input light so that the input light penetrating or reflected through the sample unit 20 may be collected by the light receiving sensor unit 30.

The position change between the light receiving sensor unit 30 and the light source unit 10 may be made relatively, and such position change may be appropriately made by manual or automatic selection according to a measurement item.

The collection sensor may be formed separately from the color sensor 31 or may be integrally formed with the color sensor 31.

On the other hand, the color sensor 31 is to separate the collected light into the colors of the RGB three elements, and to convert the electric signal by quantizing the density for each color element, for this purpose, the color sensor 31 is It may comprise a converter.

In addition, the converter may include a first converter 32, a second converter 34, and a third converter 36 so that the collected light corresponds to the divided R, G, and B.

The transducers 32, 34 and 36 quantify the concentrations of R, G and B separated from the collected light, and convert the converted values into electrical digital signals (electric signals).

In this way, white light composed of a combination of independently emitted R, G, and B is used as input light, and the light receiving sensor unit 30 separates each of R, G, and B from the collected white light and reads the color density directly. Therefore, the measurement accuracy can be improved.

Furthermore, since the light receiving sensor unit 30 directly collects the light passing through the sample unit 20 and directly measures the color change, the liquid sample or the material to be measured is colored by the indicator and shows the color difference according to the concentration. Solid samples in the form of strips or solids that are absorbed and show color differences depending on the concentration, or even if no indicator is added, can be measured for all samples having the same color as the color difference samples including color differences for each concentration in the sample itself. In one device, multiple concentration readings can be made.

In addition, since the miniaturization and light weight of the light source unit 10 and the light receiving sensor unit 30 can be achieved, the portable device can be carried out, and the improvement of the portability can be transferred to the measuring device to a measurement location in the diagnosis of the environment. Can facilitate real-time water quality inspection on site.

Here, the color sensor may be a color sensor that separates the collected light into a color other than RGB.

For example, the color sensor may separate the collected light into Y (yellow), M (magenta), C (cyan), etc. For this purpose, the color sensor has two sensitivity to different wavelength bands It can be achieved by including the above channel.

In this case, the transducer is preferably provided to correspond to the color described above.

On the other hand, the converter may be formed of a conventional analog to digital convert (A / D converter).

The transducers 32, 34, and 36 may be provided inside the color sensor 31 or selectively provided outside the color sensor 31, and further, outside the light receiving sensor unit 30. It is also possible to be provided in.

In addition, the light receiving sensor prevents light emitted from the light source unit 10 from being scattered by a material other than the sample unit 20, or scattered by another material after passing through the sample unit 20. In order to receive light accurately and stably in the unit 30, a dark room 110 including the light source unit 10, the sample unit 20, and the light receiving sensor unit 30 may be further provided.

Here, the dark room 110 may be provided separately, or the casing 100 of the concentration measuring device may be provided to function as the dark room.

Meanwhile, the electrical signal converted by the light receiving sensor unit 30 may be converted into a protocol required for communication and transmitted to the receiving unit 45 through the transmitting unit 40.

In addition, the electrical signal received by the receiver 45 is preferably converted into a conversion value by the conversion algorithm and the color coordinate system in the calculation unit 50.

In addition, the operation unit 50 may calculate the concentration of the target substance to be contained in the sample to be read in comparison with the standard value stored in advance.

In detail, the operation unit 50 preferably generates a first intermediate value from the received electrical signal using a color coordinate system based on an XYZ tristimulus value.

Here, the first intermediate value may be expressed as a value of x, y, and z, respectively.

It is preferable to generate a secondary intermediate value represented by u 'and v' through the conversion algorithm and the Lu'v 'color coordinate system from the primary intermediate value.

Then, it is preferable to calculate a conversion value of y 'from the second intermediate value through a conversion algorithm.

Here, the conversion algorithm may be a formula stored in advance for a specific operation, the color coordinate system applied when the first or second intermediate value is calculated, as well as CMYK or L as well as XYZ color coordinate system and Lu'v 'color coordinate system. Various color difference representation coordinate systems such as * a * b color coordinate system may be used.

The converted value is calculated as a concentration through comparison with the standard data stored in the data storage 60 in advance.

In this case, the standard data is preferably composed of a standard conversion value derived in correspondence with each measurement item to be measured from the target material (standard sample) to be contained in the sample and a concentration value corresponding to the standard conversion value. Do.

That is, the standard data is preferably represented as a function by making a linearization coefficient with a standard transform value derived from a standard sample.

Accordingly, the standard data may be in the form of linear data or non-linear data.

In addition, the concentration calculated by the operation unit 50 is preferably displayed through the display unit 80, where the display unit 80 may be configured as a conventional liquid crystal display (LCD).

In addition, the measured value displayed on the display unit 80 is preferably displayed in at least one display mode to obtain a variety of information about the sample.

For example, the display mode may be set to display a measurement value corresponding to each measurement target material contained in the sample, or the sample may be compared with a standard (for example, the Ministry of Environment-notified water quality standard) for comparing the measured values. The concentration grade can be displayed, such as, through which the user can check a variety of information about the sample.

In addition, the display mode may display the color difference as well as display the concentration of the target material, thereby enabling the concentration measuring device to be utilized as a color difference meter.

To this end, the input unit 90 may be further provided in the concentration measuring apparatus so that the user can input the change contents when the user wants to change the measurement item.

In addition, the input unit 90 is not only capable of switching input of a utilization mode such that the concentration measuring device can be utilized as a color difference meter, but also configured to enable concentration-related input such as measurement material, precision of measurement value, and display range. Of course it should.

On the other hand, the light source unit 10, the light receiving sensor unit 30, the operation unit 50 and the display unit 80 is preferably controlled by the control unit 70.

The input unit 90 may be further provided to change an item to be measured in the sample, and the input unit 90 may also be connected to and controlled by the control unit 70. .

On the other hand, as shown in Fig. 3 and 4, the NO ₂ experiment was performed on the sample developed by the NO ₂ indicator.

Here, the comparative example was measured by an absorber using the absorbance method.

First, in order to compare the Y (ABS) and the sample concentration (A) of the comparative example corresponding to the converted value, in the embodiment, each of the RGB generated by the light receiving sensor unit 30 as an electric signal and the operation unit 50 The median value (x, y, z, u ', v') and the conversion value y 'were calculated.

The sample concentration B was obtained by comparing the converted value y 'with the preset standard data.

Here, the correlation coefficient value (R ² ) showed a linearity of 0.986.

Through this, it can be seen that the concentration value of the sample measured through the example shows high reliability.

The standard data set in advance and applied to the embodiment were obtained by making linearization coefficients with standard transform values derived from standard samples.

In this case, the standard data may be represented as Y '= 0.967x'-0.004, and may be composed of linear data in the form of a linear function.

Here, Y 'may be defined as a standard conversion value, and x' may be defined as a concentration value corresponding to the standard conversion value.

As such, since the standard data is made up of linear data, even if the conversion value y 'does not coincide with the standard data, it can be calculated by interpolation or the like, thereby obtaining a reliable concentration value of the target substance. It becomes possible.

5 is a flowchart illustrating a measurement step when the standard data of the concentration measuring device according to an embodiment of the present invention is non-linear data, and FIG. 6 is a non-linear standard data of the concentration measuring device according to an embodiment of the present invention. In the case of the conventional data, it is a table comparing the measured values of the comparative example and the example, and FIG. 7 is a graph showing standard data of the comparative example and the example according to FIG. 6.

As shown in FIGS. 5-7, chemical oxygen demand (COD) experiments were performed on samples developed by the COD indicator.

Here, the comparative example was measured by an absorber using the absorbance method.

First, in order to compare the Y (ABS) and the sample concentration (A ') of the comparative example corresponding to the converted value, in the embodiment, the RGB received by the electrical signal in the light receiving sensor unit 30, and generated by the calculating unit 50 Each intermediate value (x, y, z, u ', v') and the converted value y 'were calculated.

Then, the converted value y 'was compared with the preset standard data to obtain a sample concentration B'.

Further, the standard data set in advance and applied to the embodiment were obtained with standard conversion values derived from standard samples and concentration values corresponding to the standard conversion values.

Here, the standard data may be made of non-linear data. The non-linear data may be made of various types of data such as a hat shape or a log function.

The hatshade data may be formed by connecting a function having a + slope and a function having a − slope. As such, when the standard data has a hatshade shape, two or more concentration values may be provided for one converted value. have.

As shown in FIG. 7, when the conversion value y 'is T, the concentration value of P ₁ or P ₂ may be obtained.

Therefore, any one of P ₁ and P ₂ should be selected. For this purpose, the calculation unit 50 preferably selects at least one of RGB converted into electric signals as a corrected color.

In this case, it is preferable that a color having a value that continuously rises or falls continuously among RGB is selected.

A reference value is preferably selected from among the values of the selected correction color, and appropriate standard data can be selected based on the reference value.

For example, if the reference line S _L is applied to the standard data according to the reference value of the corrected color and is equal to or less than the reference value, it is determined as the density P ₁ existing on the left side based on the reference line S _L , and is equal to or greater than the reference value of the color. The concentration value may be selected in such a manner that the concentration P ₂ existing on the right side is determined based on the reference line S _L.

Therefore, even if the standard data is made of non-linear data, the density can be determined by selecting at least one of the RGB colors as the correction color and selecting the standard data corresponding thereto.

In this case, the correction data storing the correction algorithm for selecting the correction color and selecting the reference value as described above may be included in the standard data, and through this, even if the standard data is a function of any form, the correction algorithm accordingly It can then be applied, which makes it possible to measure the concentration of the target substance.

On the other hand, it is preferable to enable the user to download the updated (up-date) standard data through the web (web) so that the continuous supplement and supplementation of the above-mentioned standard data to the user, for this purpose, the concentration measuring device It is preferable that a separate receiving device for receiving data is further provided.

In addition, the concentration measuring device may be further provided with a separate on-line data transmission device (not shown), through the on-line data transmission device, it is possible to transmit the measured concentration value to another area. have.

8 is a flow chart showing the measuring step of the concentration measuring apparatus according to an embodiment of the present invention.

As shown in FIG. 8, in the present invention, the concentration measuring device collects white light irradiated to a sample part and collects the received light in the light receiving sensor part, and calculates a conversion value using an electric signal digitized by separating the light into RGB. Concentrations are calculated against data and can be controlled to ensure fast and accurate measurements on multiple items.

Referring to Figure 8, it will be described the measuring method of the concentration measuring device as follows.

First, the sample to be measured is included in the sample unit, and the white light formed by mixing each of the light emitted independently from the red light emitting diode, the green light emitting diode, and the blue light emitting diode is irradiated to the sample unit (S100).

The light collected by the light receiving sensor unit after being irradiated to the sample unit is divided into three elements of R, G, and B, and the color density of the light collected through the color sensor and the conversion unit may be provided in the light receiving sensor unit. Convert to an electrical signal by digitizing (S110).

The converted electric signal is converted into a protocol necessary for transmission, and then transmitted to the receiving unit through the transmitting unit.

The calculation unit converts the electrical signal by a color coordinate system and a conversion algorithm, calculates a conversion value, and compares the conversion value with previously stored standard data to calculate a concentration of a target substance contained in the sample to be read ( S120).

 Here, the standard data is preferably composed of linear data, and even if the converted value does not coincide with the standard data, it is possible to calculate the closest result by applying an appropriate calculation method such as interpolation. In addition, it is possible to obtain more reliable water pollution results.

On the other hand, when the standard data is made of non-linear data, the concentration of the target material is set to a reference value by selecting at least one of the RGB converted to the electrical signal as a correction color, and selects the standard data based on the reference value By doing so, the concentration present in the appropriate concentration range can be determined (S140).

In addition, since the input light irradiated to the sample portion is formed in the form of mixed white light emitted independently of each of the light of R, G, and B, the time required for measuring the concentration can be shortened, and the measurement is simple and accurate. It is possible to get a value.

The calculated value (for example, the concentration value) of the concentration measuring device obtained through the above method is output through the display unit (S130), the display unit can display a variety of display modes for each user, so that the user can You can get variously.

As described above, the present invention is not limited to the above-described specific preferred embodiments, and various modifications by those skilled in the art to which the present invention pertains without departing from the gist of the present invention claimed in the claims. Implementations are possible and such variations are within the scope of the present invention.

1 is a block diagram showing a schematic configuration of a concentration measuring apparatus according to an embodiment of the present invention.

Figure 2 is a flow chart showing the measurement step when the standard data of the concentration measuring device according to an embodiment of the present invention is general linear data.

Figure 3 is a table showing a comparison of the measured values of the comparative example and the case where the standard data of the concentration measuring device according to an embodiment of the present invention is linear data.

4 is a graph showing standard data of a comparative example and an embodiment according to FIG. 3;

5 is a flow chart showing a measurement step when the standard data of the concentration measuring device according to an embodiment of the present invention is non-linear data.

6 is a table comparing the measured values of the comparative example and the embodiment when the standard data of the concentration measuring device according to an embodiment of the present invention is non-linear data.

7 is a graph showing standard data of a comparative example and an embodiment according to FIG. 6;

8 is a flow chart showing the measuring step of the concentration measuring apparatus according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

10: light source 12: red light emitting diode

14: green light emitting diode 16: blue light emitting diode

20: sample portion 22: cell

30: light receiving sensor 31: color sensor

32: first converter 34: second converter

36: third converter 40: transmitter

45: receiver 50: calculator

60: data storage 70: controller

80: display unit 90: input unit

100: casing 110: darkroom

Claims (10)

A sample unit including a sample to be measured; A light source unit for irradiating light to the sample unit; A light receiving sensor unit collecting light emitted from the sample unit and converting the collected light into an electrical signal; The electrical signal is generated as a first order intermediate value represented by x, y, and z by a color coordinate system based on an XYZ tristimulus value, and is converted from the first order intermediate value through a conversion algorithm and a Lu'v 'color coordinate system. A second intermediate value expressed by 'is generated, and is numerically converted from the second intermediate value to a conversion value expressed by y through the conversion algorithm, and the converted value is contained in the sample from the target material to be read. Including the standard conversion value derived corresponding to each measurement item to be measured and the concentration value corresponding to the standard conversion value to be compared with the previously stored standard data, but the standard data is made of linear data The concentration value corresponding to the standard conversion value is calculated as the concentration of the target substance, and when the standard data consists of nonlinear data, A calculation unit configured to calculate a concentration value present in a concentration range corresponding to any one of a reference value of an RGB to be converted into the electrical signal as the concentration of the target material; And And a display unit for displaying the concentration calculated by the calculation unit. The method of claim 1, The sample is a concentration measurement device, characterized in that made of at least one of a liquid sample, a solid sample, and a color difference sample having a color difference per concentration without the input of the indicator is added. The method of claim 1, The light source unit comprises a red light emitting diode, a green light emitting diode, and a blue light emitting diode, and the light emitted from the light source unit is a density measurement, characterized in that the white light is a mixture of the respective light emitted independently from each light emitting diode Device. The method of claim 3, The white light is controlled to be white when the power is applied when the sample is not inserted, and the light emitting diodes are controlled and initialized based on a predetermined RGB value and a pulse width modulation ratio. Concentration measuring device. The method of claim 1, The light-receiving sensor unit comprises a color sensor for distinguishing the collected light into three elements of RGB, and converting the light into an electrical signal in which the concentration is numerically determined for each element. . delete delete The method of claim 1, The light source unit, the light receiving sensor unit, the operation unit and the display unit is controlled by the control unit, the control unit, characterized in that the input unit for changing the item to be measured in the sample is further connected. Irradiating a sample portion including a sample to be measured by white light, which is formed by mixing each of light emitted independently from a red light emitting diode, a green light emitting diode, and a blue light emitting diode; Collecting light irradiated to the sample unit and dividing the light into three RGB elements, and converting the density of each color element into an electrical signal; The electrical signal is generated as a first order intermediate value represented by x, y, and z by a color coordinate system based on an XYZ tristimulus value, and is converted from the first order intermediate value through a conversion algorithm and a Lu'v 'color coordinate system. A second intermediate value expressed by 'is generated, and is numerically converted from the second intermediate value to a conversion value expressed by y through the conversion algorithm, and the converted value is contained in the sample from the target material to be read. Including the standard conversion value derived corresponding to each measurement item to be measured and the concentration value corresponding to the standard conversion value to be compared with the previously stored standard data, but the standard data is made of linear data The concentration value corresponding to the standard conversion value is calculated as the concentration of the target substance, and when the standard data consists of nonlinear data, Allowing the concentration value existing in the concentration range corresponding to any one of the reference values of the RGB to be converted into the electrical signal to be calculated as the concentration of the target material; And Measuring method of the concentration measuring device comprising the step of displaying the calculated concentration. delete

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