KR20080097012A - Salt level measuring apparatus having a temperature correction function - Google Patents

Abstract

An apparatus for measuring a sample is provided to measure temperature of the sample on a real time basis by including temperature correction function and to measure sweetness degree/ acidity/ salinity/ moisture to the swarming sample by computing each temperature correction factor from a resistivity correction factor table. An apparatus for measuring a sample contains: a temperature table in which data are stored; a storage part(110) for storing data table of each measured temperature section and a resistivity correction factor table; a key input circuit division(120) for outputting a sample measurement starting signal according to a manipulation of users; a microprocessor(160) for generating a control signal according to input of the key input circuit division; an oscillation circuit(170) for generating and outputting an oscillation signal by controlling a microprocessor; a sample measurement part(130) for measuring sample, and outputting the measured sample of sensing signal; a temperature sensor(185) for measuring and outputting temperature of the sample; a level converter(140) for changing the sample sensing signal outputted from the sample measurement part to a direct current level; and a signal processing unit(150) for producing and outputting a comparison signal for measuring the sample.

Description

Sample measuring apparatus having a temperature correction function

1 is a block diagram for explaining the configuration of a sample measuring device having a temperature correction function according to the present invention

FIG. 2 is a block diagram illustrating in more detail the configuration of the sample measuring unit and the level converting unit shown in FIG. 1. FIG.

3 is a view showing a salinity sensor of the bar type

*** Explanation of symbols on main parts of drawing ***

110: storage unit

120: key input circuit

130: sample measuring unit

140: level conversion unit

150: signal processing unit

160: microprocessor

170: oscillation circuit

190: display unit

The present invention relates to a sample measuring device having a temperature correction function, and more particularly, to a temperature sensor having a temperature correction function for measuring the temperature of the sample in real time so that measurements can be made even for boiling samples. It relates to a sample measuring device.

Generally, when consumers choose fruit, they prefer to eat and look good, but the first criterion for fruit selection is sugar, and acidity is also an important factor. However, since the sweetness and acidity of the fruit does not have a method that can be easily measured other than the method of eating, most consumers buy the fruit which is selected by the appearance and high grade. In this case, the sugar content and acidity can not be confirmed when purchasing fruit, which is a frequent occurrence of consumer complaints after purchase.

Salt is a compound of sodium and chlorine, called salt, and in the chemical name sodium chloride (NaCl). Salt is used as a seasoning to taste food in our lives, or it is used to store food. In addition, salt is present in the body fluids to maintain the osmotic pressure, the amount of salt required by the human body depends on the amount of activity, climate, and the like. Adults need 12 to 13 grams of salt per day, and excessive salt intake can cause adult illness, such as high blood pressure.

Therefore, devices for measuring salinity, which is the concentration of salinity, have been developed. The salinity measuring device developed for this purpose generally measures the temperature of a sample stored in an accommodating part, and the temperature correction coefficient is changed according to the measured temperature. The salinity of the sample is accurately measured.

As described above, when measuring the sweetness and acidity of the fruit or when measuring the salinity of food, it is usually measured in the range of 10 to 40 ° C., and a wide temperature range of 0 to 100 ° C., that is, a boiling sample There was a problem that it is impossible to measure the sugar / acidity / salinity / moisture.

The present invention has been made to solve the problems of the prior art as described above, an object of the present invention is to provide a sample measuring device having a temperature correction function to measure the sugar / acidity / salinity / moisture for the boiling sample To provide.

In order to solve the above technical problem, a sample measuring apparatus having a temperature correction function according to an embodiment of the present invention includes a storage unit for storing a temperature table, a data table of each measurement temperature section, and a correction coefficient table; A key input circuit unit for outputting a sample measurement start signal according to a user's operation; A microprocessor for generating a control signal according to the input of the key input circuit unit; An oscillation circuit unit generating and outputting an oscillation signal under the control of a microprocessor; A sample measuring unit measuring a sample in synchronization with an oscillation signal output from the oscillating circuit unit and outputting a detection signal of the measured sample; A temperature sensor that contacts the sample and measures and outputs the temperature of the sample in real time; A level converting unit converting the sample detecting signal output from the sample measuring unit into a DC level; And a signal processor for generating and outputting a comparison signal for measuring a sample by using a sample detection signal having a DC level output from the level converter. In the above configuration, the microprocessor calculates the temperature correction value from the measured temperature of the sample output from the temperature sensor and the temperature data stored in the storage unit, the data table of the measured hot and cold interval, and the temperature correction coefficient table, and uses the calculated temperature correction value. To correct the temperature, calculate the sample measurement data, and control the entire system so that the calculated sample measurement data is displayed on the screen of the display unit.

Other objects and advantages of the present invention in addition to the above object will become apparent from the description of the preferred embodiment of the present invention with reference to the accompanying drawings.

In the embodiment of the present invention, a sample measuring device having a temperature correction function will be described with an example of a food salinity measuring device.

1 is a block diagram showing the configuration of a sample measuring device having a temperature correction function according to an embodiment of the present invention. Referring to FIG. 1, the sample measuring device includes a storage unit 110 storing a temperature table, a data table of each measurement temperature section, and a correction coefficient table, and a key input for outputting a salinity measurement start signal of a sample according to a user's operation. A microprocessor 160 for generating a control signal according to the input of the circuit unit 120, the key input circuit unit, an oscillation circuit 170 for generating and outputting an oscillation signal under the control of the microprocessor 160, the oscillation circuit is output from From the sample measuring unit 130 to measure the salinity of the sample in synchronization with the oscillation signal, and outputs the measured salinity detection signal, the temperature sensor 185 to measure and output the temperature of the sample in real time, from the sample measuring unit 130 A comparison signal for measuring the sample is generated by using the level detection unit 140 for converting the salinity detection signal output to the DC level and the sample detection signal of the DC level output from the level conversion unit 140. And a signal processing unit 150 for outputting. The sample measuring device according to the present invention includes a span correction unit 180 for correcting a sudden change in the surrounding environment and a display unit 190 for displaying a measurement result.

FIG. 2 is a block diagram illustrating in more detail the configuration of a sample measuring unit and a level converting unit applied to FIG. 1. 2, the sample measuring unit 130 includes first and second electrodes 130a and 130b. In the sample measuring unit 130, when an oscillation signal of a specific frequency generated from the oscillating circuit unit 170 is transmitted to the first electrode 130a in contact with the sample, the conductivity of the sample is changed, and the changed conductivity is changed to the second electrode. Detected by 130b. The level converting unit 140 includes an AC voltage detecting unit 133 for detecting a change in an AC voltage according to the conductivity detected by the second electrode 130b and an AC voltage detected by the AC voltage detecting unit 133. A DC voltage converter 134 converts the voltage.

3 is a view showing a salinity sensor of the bar type according to an embodiment of the present invention. Referring to FIG. 3, the sample measuring unit 130 is a bar type first electrode 130a and a second electrode formed to be spaced apart from the first electrode 130a so as not to contact the first electrode 130b. 130b, a bar-shaped temperature sensor 185 formed at a predetermined distance from the first electrode 130a and the second electrode 130b, the first electrode 130a, the second electrode 130b, and Consists of the exterior member 135 formed to surround the temperature sensor 185, the temperature sensor 185 is preferably formed to protrude from the exterior member 135 to the outside.

Meanwhile, the first and second electrodes 130a and 130b use a Pt 100Ω 4 wire type as a platinum plated electrode. This is because plating with platinum is not only more stable than gold, but also resistant to acids and alkalis. The temperature sensor 185 uses Pt 100Ω as a platinum temperature sensor so that temperature correction can be accurately performed, and directly touches the sample to directly sense the temperature of the sample so that temperature correction can be made. In addition, the temperature sensor 185 converts the resistance change according to the temperature change into a voltage value, and compensates the temperature of the sample using the converted voltage value.

Hereinafter, the operation of the sample measuring device having the temperature correction function configured as described above will be described.

Before describing the sample measurement of the sample measuring device having the temperature correction function to which the present invention is applied, a process of creating a temperature correction coefficient table will be described.

First, a sample to be used for preparing a temperature correction coefficient table is selected. In selecting a sample, the more types of samples, the more accurate calibration can be performed. Subsequently, a temperature table with a range of 0 to 100 ° C is drawn through the experiment, and the data value of the temperature section is calculated. In selecting a temperature section, a reference temperature, that is, a calibration temperature (about 23-25 ° C.) and a temperature to be corrected are selected.

The following is an example of the preparation of the correction coefficient table according to the experimental results.

# 1 test result

Measuring temperature sample 23 ℃ 0.5% 1.0% 1.5% 2.0% 10 ℃ 0.4% 0.8% 1.1% 1.3%

Based on the results, the change value of each sample per 1 ° C is obtained.

#2. Temperature difference ==> 23 ℃ -10 ℃ = 13 ℃

# 3. Change amount per 1 ℃ for each sample

0.5% ---> (0.5% -0.4%) / 13 ℃ = 0.01%

1.0% ---> (1.0% -0.8%) / 13 ℃ = 0.02%

1.5% ---> (1.5% -1.1%) / 13 ℃ = 0.03%

2.0% ---> (2.0% -1.3%) / 13 ℃ = 0.05%

#4. Since the correction is made up to 1/10 of the minimum unit, the change amount is calculated up to 1/100.

# 5. A temperature correction table is prepared using the data results. When preparing the temperature correction table, the program detects four A / D values corresponding to 0.5%, 1.0%, 1.5%, and 2.0% of the sample, and then curves the four result values in the same manner. According to this, the more samples used in the temperature calibration experiment, the more accurate the calibration can be.

Through the above experiment, a temperature table, a data table for each temperature section, a temperature correction coefficient table are generated, and each of the generated tables is stored in the storage unit 110 to measure salinity of a sample between 0 and 100 ° C. When used.

When the user inserts the sample measuring device into the sample for sample measurement and inputs the salinity measurement start signal through the key input circuit 120, the microprocessor 160 receives the sample temperature from the temperature sensor 185. When the reference temperature is high, the microprocessor 160 compares the input sample temperature with the reference temperature, subtracts the sample temperature from the reference temperature, and adds the subtraction amount to the value before correction. In addition, the microprocessor 160 reads the temperature of the sample from the temperature table of the storage unit 110, and reads the corresponding data and temperature correction coefficients from the data section and the temperature correction coefficient table for each temperature section, Substitute the temperature compensation value.

Temperature correction value = value before correction ± (correction factor × (reference temperature-sample temperature)) / 10

After the temperature correction is performed as described above, the microprocessor 160 outputs a control signal to the oscillation circuit unit 170. The oscillation circuit unit 170 generates an oscillation signal of a specific frequency in response to a control signal from the microprocessor 160 and outputs it to the sample measuring unit 130. At this time, the frequency of the oscillation signal should be set to measure the salinity up to 15%.

The oscillation signal of a specific frequency generated from the oscillation circuit unit 170 is transmitted to the first electrode 130a of the sample measuring unit 130 in contact with the sample, and the first electrode 130a is operated by the oscillation signal. Change the conductivity of the sample.

The conductivity of the sample thus changed is output through the second electrode 130b of the sample measuring unit 130, and the AC voltage detecting unit 140a generates the AC voltage generated through the second electrode 130b according to the salinity change. When the change is detected and output to the DC voltage converter 140b, the DC voltage converter 140 converts the AC voltage into the DC voltage.

Meanwhile, the temperature sensor 185 changes the output level of the signal processed by the signal processor 150 according to the temperature in order to accurately measure the salinity of the sample. At this time, the output voltage of the temperature sensor 185 is changed by the automatic calibration program of the initial measurement microprocessor 160.

As described above, the salinity comparison comparison signal, which has been processed by the signal processing unit 150, is input to the microprocessor 160, and the microprocessor 160 stores the input salinity comparison signal and the reference stored in the storage unit 110. The salinity signal is compared and the result value according to the comparison result is displayed on the display unit 190 so that users can know the salinity of the sample.

On the other hand, the food salinity device according to the present invention includes a span correction unit 180, the span correction unit 180, when the user wants to measure the salinity of the sample, such that the temperature is sharply dropped or rises such that When it is determined that the abrupt change has been made so that the salinity comparison data inputted from the signal processor 150 to the microprocessor 160 is kept constant, and the user presses the span correction button as necessary in the above case, The microprocessor 160 causes the voltage to be supplied to the span correction unit 180 for a preset time, and the span correction unit 180 is operated only while the power is supplied under the control of the microprocessor 160. .

When the span correction unit 180 is operated as described above, the value is adjusted so that the salinity comparison data input from the signal processor 150 to the microprocessor 160 can be recognized by the microprocessor 160. Ensure that the salinity of the sample is accurately measured without being affected by the external environment.

As described above, the sample measuring apparatus having the automatic calibration function according to the present invention has been described taking the salinity measurement of food as an example, but the present invention is not limited thereto, and it is obvious that the present invention can be applied to the measurement of sugar, acidity, and moisture in addition to salinity. .

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

The present invention having the configuration and operation and the preferred embodiment as described above has the effect of allowing the temperature sensor to measure the temperature of the sample in real time so that the measurement can be made on the boiling sample.

According to the present invention, the temperature correction coefficient for each temperature is read from the correction coefficient table and calculated.

Claims (8)

In the sample measuring device having a temperature correction function, A storage unit storing a temperature table for storing data, a data table for each measurement temperature section, and a correction coefficient table; A key input circuit unit for outputting a sample measurement start signal according to a user's operation; A microprocessor for generating a control signal according to the input of the key input circuit unit; An oscillation circuit unit for generating and outputting an oscillation signal under the control of the microprocessor; A sample measuring unit measuring a sample in synchronization with an oscillation signal output from the oscillating circuit unit, and outputting a detection signal of the measured sample; A temperature sensor that contacts the sample and measures and outputs the temperature of the sample in real time; A level converting unit converting the sample detecting signal output from the sample measuring unit into a DC level; A signal processing unit for generating and outputting a comparison signal for measuring a sample by using a sample detection signal of a DC level output from the level conversion unit; The microprocessor calculates a temperature correction value from the measured temperature of the sample output from the temperature sensor, the temperature data stored in the storage unit, the data table of the measured temperature interval, and the temperature correction coefficient table, and uses the calculated temperature correction value. By correcting the temperature to calculate the measurement data of the sample. The method of claim 1, The temperature compensation value is a sample measuring device, characterized in that determined by the following equation. (expression) Temperature correction value = value before correction ± (correction factor × (reference temperature-sample temperature)) / 10 The sample measuring apparatus according to claim 1, wherein the measured value of the sample includes any one of sugar of the sample, acidity of the sample, salinity of the sample, and water of the sample. The method of claim 1, The sample measuring unit detects the oscillation frequency output from the oscillating circuit unit and includes a first electrode in contact with the sample, and a second electrode for measuring the changed conductivity of the sample in contact with the sample. Having a sample measuring device. The method of claim 1, The sample measuring unit and the temperature sensor may include a bar type first electrode, a second electrode formed to be separated from the first electrode by a predetermined distance so as not to contact the first electrode, and the first electrode and the second electrode. And a bar-shaped temperature sensor formed at a predetermined distance apart from the first electrode, the second electrode, and an exterior member formed to surround the temperature sensor. The method of claim 1, The temperature sensor is a sample measuring device, characterized in that for converting the resistance change according to the temperature change to a voltage value, using the converted voltage value to compensate the temperature of the sample. The method of claim 1, The temperature sensor is a sample measuring device, characterized in that it comprises a Pt 100Ω 4-wire type. The method of claim 1, The level converter An AC voltage detector for detecting and outputting an AC voltage change generated through the second electrode according to a salinity change of the sample, and a DC voltage converter for converting an AC voltage output from the AC voltage detector into a DC voltage. A sample measuring device, characterized in that.

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