KR101014209B1 - Food sugar measuring device using light quantity measurement - Google Patents

Abstract

The present invention relates to a food sugar measuring device using a light amount measurement to measure the sugar content of foods that are provided with a large amount of other substances other than sugar by providing a photodiode in place of the CCD image sensor, the present invention relates to a reference light source To measure the sugar content of the food sample by using a red LED in the visible light region, the light is emitted to a prism in which a sample stage containing a food sample for measuring sugar content is located, and the amount of light reflected by the prism is checked. After measuring the temperature of the food sample, reading the temperature correction coefficient from the temperature correction coefficient table stored in the internal memory, calculating the temperature correction value using the temperature correction coefficient, and then adjusting the temperature of the food sample corrected by the temperature correction value. It characterized in that the sugar value is output on the screen of the display unit, the present invention is to measure the sugar content of food In addition to providing an objective value at the level of sweetness felt by the food industry, food industry workplaces can measure the sweetness to ensure that the food always has a constant sweetness, thereby enhancing the quality of the food and accurately recognizing the sugar content of the food. It helps to manage the diseases that come from ingestion, and to keep people's eating habits healthy.

Food sugar, light quantity, red color, LED, temperature correction

Description

Food sugar measuring device using light quantity measurement {.}

The present invention relates to a food sugar measurement apparatus using light quantity measurement.

More specifically, the present invention relates to a food sugar measuring apparatus using a light amount measurement, which provides a photodiode instead of a ccd image sensor to measure the sugar content of a food containing a lot of substances other than sugars.

The basic tastes we feel with the tongue are sweet, sour, bitter and salty. Of course, there are many flavors such as spicy, astringent, and tart, but all tastes are considered personal eating habits.

The sweetness of the basic taste is gentle on the tongue of the person and is the most familiar to us, one of everyone's favorite flavors. Therefore, even when selecting fruit, even if the fruit with high sugar content is selected, sugar is added to various foods to increase the sweetness of the food. However, too high sweetness may also deteriorate the food's original taste, and people have a need to measure the sugar level to maintain a proper sugar content. In the case of fruits and vegetables, sugar has been measured as the most important criterion for commodity price determination, and sugar has been measured in various fields such as production and distribution for fair trade order. It is managed by.

Currently, the sugar measurement is mainly measured in the fruit to determine the price of the commodity, as shown in Figure 1 is a measuring device converts the refractive index change from the sugar solution to the electrical signal by using light as a numerical value. At this time, the output waveform of the optical sensor for measuring fruit sugar is shown in FIG.

The light source is sent to the sugar solution (juice) and the light passing through the prism is received by the CCD image sensor to check the change in the refractive index of the light and measure the sugar content. That is, the refractive index change of the light changes according to the density of the sugar solution. In the case of fruits, the sugar solution occupies more than 99.5% of water and sugar, and the change in refractive index depends on the sugar, so it can be effectively measured without problems.

However, since the food contains a lot of substances other than sugar, the refractive method to measure the change in density is somewhat problematic in measurement.

The present invention has been made to solve the above problems, the food sugar using light quantity measurement to measure the sugar content of food containing a lot of other substances other than sugar by providing a photodiode instead of ccd image sensor To provide a measuring device.

The constitution of the present invention for achieving the above object is a prism having a sample stand that can contain a food sample for measuring the sugar content; A light amount sensor emitting light to the prism and measuring a reflected light amount to output a sugar detection signal; A sugar detection signal section dividing unit for dividing the sugar detection signal of the light quantity sensor into sections; A signal amplifier for amplifying the sugar detection signal divided by the sugar detection signal section division unit; A temperature sensor detecting a temperature of a food sample contained in a sample stage of the prism; The temperature correction table is stored, and after reading the temperature correction coefficient from the temperature correction table by using the food sample temperature inputted through the temperature sensor, the arithmetic operation of the correction coefficient, the reference temperature, and the food sample temperature read is performed. A control unit configured to calculate a correction value, correct the sugar detection signal using the temperature correction value, and control all components to output a sugar value of a food sample; And a display unit for displaying the sugar value of the food sample on the screen under the control of the controller.

The present invention expresses the measurement of sugar content of food as an objective value at the level of sweetness felt by the tongue, research and development of a device for accurate measurement, and spread to home and food industry workplaces to maintain a constant sweetness by measuring, improving the quality of food In addition, by managing diseases caused by excessive intake of sugar, it is effective to manage people's eating habits to maintain healthy eating habits.

Hereinafter, the configuration of the present invention will be described in detail with reference to embodiments of the present invention illustrated in the accompanying drawings.

As shown in FIG. 3, the apparatus for measuring food sugar using light quantity measurement according to the present invention includes a prism 100 having a sample stand 110 that may contain a food sample for measuring sugar content, and the prism ( A light quantity sensor 200 which emits light and measures the amount of reflected light and outputs a sweetness detection signal, and a sugar content detection signal interval dividing unit 300 dividing the sweetness detection signal of the light quantity sensor 200 into sections; And a signal amplifier 400 for amplifying the sugar detection signal divided by the sugar detection signal section dividing unit 300, and sensing the temperature of the food sample contained in the sample stage 110 of the prism 100. The temperature sensor 500 and the temperature correction table are stored. Using the food sample temperature input through the temperature sensor 500, the correction coefficient read after the temperature correction coefficient is read from the temperature correction table. Temperature The control unit 600 arithmetic operation of the food sample temperature to calculate a temperature correction value, and correcting the sugar detection signal using the temperature correction value, and then controls the entire component to output the sugar value of the food sample 600 And a display unit 700 displaying a sugar value of the food sample on the screen under control of the controller 600, a battery 800 for supplying driving power of the controller 600, and the battery 800. And a battery remaining amount checking unit 850 for checking a remaining amount of the remaining amount and sending a check result value to the control unit, and a key signal input unit 900 for inputting a key signal for measuring sugar content of the food sample.

As shown in FIG. 5, the prism 100 is designed and manufactured in consideration of the area of the light source and the sample table 110 and the like, and the designed prism 100 has a sugar measuring range (0 to 30). The prism wavelength is 670 nm considering the wavelength of the red light source.

In addition, the light source of the light emitting unit 210 is about 5 mm around the center of the prism 100, and the light source has to be 90 ° with the prism face, so the sample is 27.5 °. At this time, the margin including the light source at the height H of the prism 100 is about 2 mm. After determining the angle of the light source, the receiving side is determined at a right angle from the center of the light source, and the center of the photodiode 221 is determined. In addition, the light source 5 mm can be emitted to the prism 100 reflecting surface as it is to obtain the measurement portion (8.8 mm) of the food sample on the reflecting surface of the prism 100. Therefore, the measuring hole (Holl) of the stainless plate of the sample stage is 8.8 mm. Thus, the prism design can determine the sample stage. The size and shape of the other portions of the prism 100 are the dimensions in which the prism 100 is well fixed and governs the engagement with the injection molding.

The controller 600 may display the check result value of the battery remaining amount checker 850 at any position on the screen of the display unit 700.

The light amount sensor 200 includes a light emitter 210 that emits light for measuring sugar content to a reflective surface of the prism 100 within a predetermined range around a center of the prism 100, and the prism 100. The light amount receiving unit 220 is configured to receive light incident through the light source, measure the amount of light, and convert the measured amount of light into a sugar detection signal.

The light quantity receiving unit 220 is a photodiode 221 for converting the amount of light passing through the food sample from the light emitting unit 210 into an electrical signal, and the cathode terminal of the photodiode 221 is an inverting terminal (-) It is connected to, and is connected between the differential amplifier 223 for outputting the amount of light as a voltage, and between the inverting terminal (-) and the output terminal of the differential amplifier 223, to control the amplification degree of the differential amplifier 223 Amplification degree control unit 225 is configured.

The display unit 700 is formed of an LCD provided with a backlight, and the backlight is turned on or off under the control of the controller 600.

The light emitting unit 210 includes a red LED (light emitting diode) in the visible light region.

The sugar detection signal interval dividing unit 300 is composed of a high, middle, and low range dividing unit, and divides the sugar detection signal into high, middle, and low ranges, and the signal amplifying unit 400 is high, middle. A plurality of signal amplifiers 410 to 440 are configured to amplify the sugar detection signals divided into the row ranges.

The control unit 600 is divided into a wait mode and a stop mode as an operation mode, and when an arbitrary key signal is input from the key signal input unit 900 in the weight mode, the controller 600 is stored in an internal memory. Implement a program for measuring the sugar content of a food sample.

Referring to the operation of the food sugar measuring device using the light amount measurement configured as described above are as follows.

When the user for measuring the sugar puts the food for measuring the sugar on the sample stage 110 placed on the prism 100 to measure the sugar, and then press the measurement button provided in the key signal input unit 900, The key signal input unit 900 outputs a sugar measurement request signal to the control unit 600.

Then, the control unit 600 outputs a high level power on signal, the high level power on signal is applied to the base terminal of the NPN transistor Q2 of the power circuit of FIG. 6, and the NPN transistor Q2 is turned on. Then, a low level signal is applied to the base terminal of the PNP transistor Q1 connected to the battery 800, and the PNP transistor Q1 is turned on to supply the voltage supplied from the battery 800 to the constant voltage generator 870. In order to be applied, the constant voltage generator 870 supplies driving power to each component block forming the food sugar measuring device using light quantity measurement. In this case, the power on signal may be supplied by a power button (not shown) provided in the key signal input unit 900. At this time, the remaining amount of the battery 800 is checked by the battery remaining amount checking unit 850, the check result is input to the control unit 600, and the control unit 600 displays the remaining amount of the battery 800 at an arbitrary position of the display unit 700. So that the user knows. That is, as shown in FIG. 7, the voltage between the resistors R2 and R6 of the battery remaining amount checking unit 850 is supplied to the controller 600, and the controller 600 checks the display unit 700 in four steps. To be displayed on the LCD screen.

As described above, the light emitter 210 of the light amount sensor 200 of FIG. 4 is driven by the driving power applied from the constant voltage generator 870. The light emitter 210 receives the driving power of the constant voltage generator 870 into the non-inverting terminal (+) of the differential amplifier 211 and turns on the red LED 212. The differential amplifier 211 removes a change in intensity of a light source due to a change in power supply voltage.

Then, the red light in the visible region is emitted from the red LED 212 to the prism 100, the light reflected through the prism 110 is incident to the photodiode 221 of the light quantity receiver 220, and the photodiode ( 221 converts the incident light amount into an electrical signal and inputs the inverting terminal (−) of the differential amplifier 223.

The photodiode 221 has a wavelength of 450 to 1000 nm and is driven by applying a reverse bias of the diode.

The amplification degree controller 225 connected between the inverting terminal (-) of the differential amplifier 223 and the output terminal of the differential amplifier 223 adjusts the amplification degree of the differential amplifier 223.

The output signal of the differential amplifier 223 is input to the sugar detection signal interval dividing unit 300, and the sugar detection signal interval dividing unit 300 divides the input light quantity signal into a high, middle, and low range signal. When output to the corresponding signal amplification unit (410 ~ 440) of the amplifier 400 amplifies the input signal and outputs to the controller 600.

At this time, the temperature of the food sample contained in the sample stage 110 from the temperature sensor 500 is measured and output to the control unit 600, the control unit 600 using the food sample temperature temperature correction table stored in the internal memory After reading the temperature correction coefficient from the arithmetic operation of the correction coefficient, the reference temperature and the food sample temperature, the temperature correction value is calculated, and the sugar detection signal is corrected using the temperature correction value. The value is output on the screen of the display unit 700 so that the user can know it. The temperature sensor 500 is an IC type temperature sensor as shown in FIG. 8. When an input voltage of 5 V is applied to the sensor, the sensor output is input to the comparator U7 through the resistor R23 and through the resistor R25. The final signal to be output is changed to 10 mV with respect to a 1 ° C. change in temperature. That is, 250 mV is output when it is 25 degreeC, and 302 mV is output when it is 30.2 degreeC.

The method of generating the correction table will be described briefly. First, three starters are made so that the temperature correction does not work, and then the temperature correction coefficient is obtained by using the measuring device as a sample to prepare a temperature correction coefficient table. Here, the temperature correction circuit is in the off state, and the food sample to be used in the temperature correction coefficient experiment is selected and prepared in advance, and the data of the two temperature sections of the food sample are tested. At this time, one of the temperature sections is selected, that is, the reference temperature, that is, the calibration (Calibration) temperature is 23 ± 1 ℃ and the other is the comparison temperature.

As described above, the experiment on the change of sugar according to the temperature for calculating the temperature correction coefficient stops the calibration program at the reference temperature of 23 ° C, obtains the change of sugar value according to the temperature at 15 ° C, 25 ° C, and 32 ° C, and divides it by the temperature change to average The higher the sugar content is, the higher the temperature correction coefficient is. The correction coefficient of about 0.08% can be obtained based on 23 ° C.

The experimental results of the sugar change according to the temperature change are shown in the table below.

Based on the experimental results, the change value for each food sample per 1 ° C is corrected to 1/10 of the minimum unit of the sugar measuring device, so that the change amount can be obtained up to 1/100, and the correction result is the same A / D value. Substitute in to create a temperature master curve in the same way as the calibration method. At this time, the temperature correction is as follows.

Temperature correction = correction factor x (reference temperature-food sample temperature)

1 is a view for explaining an optical sensor for measuring fruit sugar.

FIG. 2 is an output waveform diagram of the optical sensor for measuring fruit sugar of FIG. 1.

Figure 3 is a block diagram for explaining the configuration of a food sugar measurement apparatus using a light amount measurement according to the present invention.

FIG. 4 is a detailed block diagram for receiving light amount through a prism of the light amount sensor applied to FIG. 3.

5 is a prism manufacturing diagram applied to the present invention.

6 is a detailed circuit diagram of the constant voltage generator applied to FIG. 1.

FIG. 7 is a detailed circuit diagram of the battery remaining amount checker applied to FIG. 1.

FIG. 8 is a detailed circuit diagram of the temperature sensor applied to FIG. 1.

<Description of Symbols for Main Parts of Drawings>

100: prism 110: sample stand

200: light amount sensor 210: light emitting unit

220: light amount receiving unit 300: sugar detection signal section division

400: signal amplifier 500: temperature sensor

600: control unit 700: display unit

800: battery 850: battery level check unit

870: constant voltage generator 900: key signal input unit

Claims (8)

In the food sugar measuring device, A prism having an upper portion of the sample stage capable of containing a food sample for measuring sugar content; A light amount sensor emitting light to the prism and measuring a reflected light amount to output a sugar detection signal; A sugar detection signal section dividing unit for dividing the sugar detection signal of the light quantity sensor into sections; A signal amplifier for amplifying the sugar detection signal divided by the sugar detection signal section division unit; A temperature sensor for sensing the temperature of the food sample contained in the sample stage; The temperature correction table is stored, and after reading the temperature correction coefficient from the temperature correction table by using the food sample temperature inputted through the temperature sensor, the arithmetic operation of the correction coefficient, the reference temperature, and the food sample temperature read is performed. A control unit configured to calculate a correction value, correct the sugar detection signal using the temperature correction value, and control all components to output a sugar value of a food sample; And A display unit displaying a sugar value of a food sample on a screen according to the control of the controller; Food sugar measurement device using a light amount measurement, characterized in that made. The method of claim 1, A battery for supplying driving power of the controller; Checking the remaining amount of the battery, and further comprising a battery remaining check unit for transmitting a check result value to the control unit, The control unit is a sugar content measuring device using the light amount measurement, characterized in that for displaying the check result value of the battery remaining amount check unit in any position on the screen of the display unit. The method of claim 1, The light amount sensor, A light emitting part emitting a sugar measurement light to a reflecting surface of the prism within a predetermined range around the center of the prism; And A light amount receiver configured to receive light incident through the prism, measure a light amount, and convert the measured light amount into a sugar detection signal and output the light amount; Food sugar measurement apparatus using a light amount measurement, characterized in that comprises a. The method of claim 1, The light amount receiving unit includes a photodiode for converting a light amount of light passing through the food sample from the light emitting unit into an electrical signal; A cathode of the photodiode is connected to an inverting terminal (-), and a differential amplifier for outputting the amount of light as a voltage; An amplification degree control unit connected between the inverting terminal (−) and an output terminal of the differential amplifier, and controlling an amplification degree of the differential amplifier, Food sugar measurement device using a light amount measurement, characterized in that consisting of. The method of claim 1, The display unit is made of an LCD provided with a backlight, the backlight is a device for measuring the sugar content of food using light quantity measurement, characterized in that the lighting or flashing under the control of the controller. The method of claim 1, The light emitting unit is a food sugar measurement device using a light amount measurement, characterized in that consisting of a red light emitting diode (LED) in the visible light region. The method of claim 1, The sugar detection signal section division unit divides the sugar detection signal into high, middle, and low ranges, The signal amplification unit, the food sugar measurement apparatus using a light amount measurement, characterized in that consisting of a plurality of signal amplification unit for amplifying the sugar detection signal divided into the high, middle, low range. The method of claim 1, The food sugar measuring device further includes a key signal input unit for inputting a key signal for measuring the sugar content of the food sample, The controller divides the operation mode into a wait mode and a stop mode, and when a predetermined key signal is input from the key signal input unit in the weight mode, the sugar content of the food sample stored in the internal memory is stored. A food sugar measurement device using light quantity measurement, characterized in that for running the measurement program to drive the food sugar measurement device.

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