KR20200001195A - Portable gas sensor for mining - Google Patents

Abstract

The present invention relates to a portable gas sensor for a mine and, more specifically, to a portable gas sensor for a mine, which is capable of automatically correcting measurement values of sensors aged over time through a calculating device and thus, accurately measuring even when time lapses. The suggested portable gas sensor for a mine aims to solve a problem that the accuracy of measurement values is reduced with time in order to be appropriate for a mine environment. Therefore, the portable gas sensor for a mine can acquire an accurate output value by correcting reduction in an output value of a sensor due to aging according to time with an equation in a specific space such as a mine where the temperature, humidity, etc, do not change. In addition, the portable gas sensor for a mine can easily manage a sensor without additional correction work until the durability life span of the sensor ends by automatically correcting the sensor, and can reduce time and costs required for replacement and correction of the sensor. Moreover, the portable gas sensor for a mine comprises a sensor unit, a calculation unit, and a communication unit.

Description

PORTABLE GAS SENSOR FOR MINING

The present invention relates to a portable gas sensor for a mine, and more particularly, to a portable gas sensor for a mine for accurate measurement over time by automatically correcting the measurement value of the sensors aged with time using a computing device will be.

The gas sensor is a generic term for a sensor that detects gas.It is one of the sensors that various gas is used as an energy source, and the demand is high not only for the industrial field but also for the home. A sensor that controls or sends an alarm.

There are many kinds of gas sensors because the detection method of the gas sensor varies depending on the type and concentration of the gas. Gas sensors have a problem in that the sensor value is changed according to temperature, humidity, storage conditions, etc., and the accuracy of the sensor is lowered.

In prior document 1 (10-2018-0006527), in the measurement of the concentration of the gas concentration meter, the measurement of the concentration of the standard gas having a variety of concentration values in advance in the memory and automatically calculates the entire value by calculating the variable value as the reference value Disclosing the correction of the concentration value linearly in the interval.

Prior Art 2 (10-2017-0024634) describes the following measured gas based on the calibration value and the reinitialization reference value according to the gas concentration (the lowest output value of the gas sensor and the output value of the gas sensor that changes every moment upon recovery after gas injection). Disclosures how to correct log values.

The environment of the mine is more than 80% of moisture, and the characteristics of temperature and humidity are kept constant even when four seasons of external environment change. However, the gas sensor in the mine has a problem that the accuracy of the measurement value is lowered due to aging over time rather than the mine environmental factors such as temperature or humidity.

However, the prior documents have a problem in that a solution for lowering the accuracy of the measured value due to aging over time to be suitable for the mining environment does not present a problem.

1. Korean Patent Publication No. 10-2018-0006527 (published Jan. 18, 2018) 2. Korean Patent Publication No. 10-2017-0024634 (published Mar. 08, 2017)

The present invention has been made in view of the above problems, and an object of the present invention is to propose a portable gas sensor for a mine, which can solve the problem of lowering the accuracy of the measured value due to aging over time so as to be suitable for the mine environment.

Portable gas sensor 10 for a mine according to a preferred embodiment of the present invention for achieving the above object uses a sensor unit 11 and the following equation to output an output value corresponding to the actual physical value of the measurement target Computation unit 12 for calculating a physical value reflecting the correction for the output value of the sensor unit 11

[Equation]

P = V * (P _max -P ₀ ) / (V _{max 0-} (at ² + bt + c)-V ₀ )

* V: sensor output reflecting aging over time

* V _max0 : measured maximum output value reflecting aging over time

* V ₀ : measured minimum output value

* P: Physical value to be measured

* P _max : Maximum measured physical value

* P ₀ : measured minimum physical value,

* t: time

a, b, c

Characterized in that it comprises a.

In addition, the communication unit 13 for receiving the corrected measurement target physical value and delivers to the user characterized in that it further comprises.

As described above, according to the present invention, a portable gas sensor for a mine is used to correct a decrease in output value of a sensor due to aging according to time in a special space such as a mine where temperature and humidity do not change when gas concentration is measured. Through it can have the effect of obtaining the correct output value.

In addition, the present invention is easy to manage the sensor by automatically calibrating the sensor until the end of the endurance life of the sensor is easy to manage, it may have the effect of reducing the time and cost required for replacement and correction of the sensor. .

1 is a functional block diagram of a portable gas sensor for mining according to the present invention
Figure 2 is a graph of the error over time of the portable gas sensor for mining according to the present invention
Figure 3 is a graph of the output value changes over time of the portable gas sensor for mining according to the present invention

As the inventive concept allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all changes, equivalents, and substitutes included in the spirit and scope of the present invention.

In describing the drawings, similar reference numerals are used for similar elements. In the following description of the present invention, if it is determined that the detailed description of the related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.

The term and / or includes a combination of a plurality of related items or any item of a plurality of related items.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the invention.

Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art.

Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art, and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Hereinafter, a portable mine gas sensor according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings. The following description of the well-known matter is omitted or simplified to clarify the gist of the present invention.

1 is a functional block diagram of a portable gas sensor for mining according to the present invention. Referring to FIG. 1, the mining portable gas sensor 10 may automatically correct a real-time error caused by aging over time. The portable gas sensor 10 for mining may include a sensor unit 11, a calculation unit 12, and a communication unit 13.

The sensor unit 11 may output an output value corresponding to the actual physical value P of the measurement target.

The calculation unit 12 may calculate a physical value reflecting the correction of the output value output from the sensor unit 11 by using an equation for correcting the decrease of the output value over time.

The communicator 13 may transmit the corrected physical value calculated by the calculator 12 to the user.

Hereinafter, a method of correcting the output value of the sensor unit 11 will be described in detail.

Figure 2 is a graph of the error change of the portable gas sensor for mining according to the present invention. Referring to FIG. 2, a general gas sensor used for a mine according to the present invention may have a sensor unit 11 that outputs an output value corresponding to an actual physical value of a measurement target. However, an error occurs in the output value of the sensor unit 11 due to aging with time, and the equation for calculating the error is as follows.

here,

* ΔV: error of output value

* Vreal: reference output

* Vmeasure: Measured value reflecting aging

Through experiments, the output error of the sensor unit 11 according to the aging of a general gas sensor (for example, CO2 sensor) used for mining may be shown in the curved shape of Figure 2, the error increases with time Could confirm. The curved shape of FIG. 2 may be approximated by Equation 2 below.

here,

* t: time

a, b, c

The coefficients (a, b, c) may vary according to the sensor specification and the manufacturer, and may be obtained in the process of approximating the experimental data by the above Equation 2.

Figure 3 is a graph of the output value change over time of the portable gas sensor for mining according to the present invention. Referring to FIG. 3, in a general gas sensor used for mining, an actual physical value of a measurement target and an output value output by the sensor may have a proportional relationship.

Assuming that V _{0 and} P ₀ do not change, the ratio of V _max and V that changes due to aging over time may be proportional. That is, the value of V may also be lowered at the same rate by decreasing from the value of V _max to V _x as time passes.

For example, if as the elapsed time V _max is lowered to V _x, V _max day when in V ₁ measured at t ₁ when V _x difference is reduced to V ₁ measured at t ₁ and V _max days When V ₂ measured at t ₂ to V _x , the difference that drops to V ₂ measured at t ₂ may be proportional.

here,

* V: output value output by sensor

* V _max : Maximum output value output by the sensor

* V ₀ : Minimum output value output by sensor

* P: Actual physical value to be measured

* P _max : Maximum physical value of the measurement object

* P ₀ : minimum physical value of the measurement object,

The maximum output value output by the sensor means an output value that the sensor unit 11 of the gas sensor can output to the maximum corresponding to the actual physical value of the measurement object, and the minimum output value output by the sensor is the sensor unit of the gas sensor. Reference numeral 11 denotes an output value that can be output to a minimum corresponding to the actual physical value of the measurement target.

The maximum physical value of the measurement target means a physical quantity that the sensor unit 11 of the gas sensor can measure to the maximum, and the minimum physical value of the measurement target is the minimum physical quantity that the sensor unit 11 of the gas sensor can measure. It may mean.

The output value output by the sensor refers to the output of the sensor unit 11 of the gas sensor reflecting aging, and the actual physical value of the measurement object may refer to a physical quantity that can be output by the sensor.

If Equation 3 is arranged based on the measurement target physical value, Equation 4 may be expressed as follows.

In Equation 4, the maximum output value V _max output by the sensor may include an error generated by reflecting aging according to time compared to the output value before aging proceeds. Accordingly, Equation 4 may be expressed as Equation 5 reflecting Equation 2 for obtaining an error in which aging is reflected.

The calculation unit 12 calculates and outputs the output value output from each sensor of the sensor unit 11 by calculating and correcting the output value output from each sensor of the sensor unit 11 to correct the decrease in output value output by the sensor reflecting aging over time. It is possible to reduce the time required to replace the equipment by preventing the error of the sensors due to aging over time, and by automatically real-time correction.

The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by those skilled in the art without departing from the gist of the present invention as claimed in the claims. Of course, such changes will fall within the scope of the claims.

10: portable gas sensor for mining
11: sensor
12: calculator
13: communication unit

Claims (2)

A sensor unit 11 for outputting an output value corresponding to the actual physical value of the measurement object; And
An operation unit 12 for calculating a physical value reflecting the correction of the output value of the sensor unit 11 using the following equation;
[Equation]
P = V * (P _max -P ₀ ) / (V _{max 0-} (at ² + bt + c)-V ₀ )
* V: sensor output reflecting aging over time
* V _max0 : measured maximum output value reflecting aging over time
* V ₀ : measured minimum output value
* P: Physical value to be measured
* P _max : Maximum measured physical value
* P ₀ : measured minimum physical value,
* t: time
a, b, c
Portable gas sensor for mining comprising a. The method of claim 1,
The portable gas sensor for mining, characterized in that it further comprises a communication unit (13) for receiving the corrected measurement target physical value to deliver to the user.

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