WO2020204462A1 - 정전용량 방식을 이용하여 수위를 측정하기 위한 장치 및 그 방법 - Google Patents
정전용량 방식을 이용하여 수위를 측정하기 위한 장치 및 그 방법 Download PDFInfo
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- WO2020204462A1 WO2020204462A1 PCT/KR2020/004114 KR2020004114W WO2020204462A1 WO 2020204462 A1 WO2020204462 A1 WO 2020204462A1 KR 2020004114 W KR2020004114 W KR 2020004114W WO 2020204462 A1 WO2020204462 A1 WO 2020204462A1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/26—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
- G01F23/263—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/26—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
- G01F23/263—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
- G01F23/266—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors measuring circuits therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/26—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
- G01F23/263—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
- G01F23/268—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors mounting arrangements of probes
Definitions
- the embodiment relates to a water level measuring apparatus, and more particularly, to an apparatus and method for measuring a water level using a capacitance method capable of accurate water level measurement.
- a water level gauge is an instrument that measures the level of water in reservoirs and drainage basins.
- Contact type includes immersion type, differential pressure type, capacitance type, and float type, and non-contact type includes ultrasonic type.
- Water level meters are developed for the purpose of measuring river water levels or measuring high-precision water levels in laboratories, so the unit cost of individual water meters is very expensive, and functions to complement individual data are generally absent.
- the capacitance-type water level meter consists of most circuits for measuring capacitance, which is a general electrical performance index for measuring instruments, and the precision of the capacitance measurement circuit mostly determines the performance of the water level meter.
- the problem with the capacitance measurement method is that even if the performance of the measurement circuit is already fully guaranteed, the temporal change of the material applied to the sensor unit, that is, based on the value calibrated at the factory according to the aging or the condition of the medium to be measured.
- the measurement object is limited to general distilled water or tap water.
- Patent Document 1 Registered Patent Publication No. 10-1906305
- the embodiment may provide an apparatus and a method for measuring a water level using a capacitance method capable of accurate water level measurement.
- An apparatus for measuring a water level includes: an electrode unit including first and second electrodes arranged side by side in a longitudinal direction, and applying a voltage to the first electrode and the second electrode; A comparison unit measuring voltages applied to the first electrode and the second electrode, and determining a time point when the measured voltage coincides with a first voltage and a time point when the measured voltage coincides with the second voltage; And a time point in which the measured voltage coincides with the first voltage is set as a start point, and a point in time coincident with the second voltage is set as an end point, and the first voltage at the first voltage based on the set start point and end point And a control unit configured to calculate a reference charging time taken to reach the second voltage, and determine a water level based on the calculated reference charging time, wherein the first electrode is formed of a steel material, so that the first part and the first part It is formed in a'c' shape that separates the second part and the third part, which are respectively extended from both ends of, and the
- the first voltage may be 0.5V
- the second voltage may be 4.5V.
- the reference charging time may be longer as the water level increases, and may be shorter as the water level decreases.
- the control unit sets a point in time when the measured voltage coincides with the first voltage as a start point of the reference charging time, and sets a point in time when the measured voltage coincides with the second voltage as an end point of the reference charge time. Can be set.
- the control unit calculates the reference charging time taken to reach the second voltage from the first voltage based on the determined start time and end time, converts the calculated reference charging time into capacitance, and the converted The water level can be determined based on the capacitance.
- the electrode part may further include a connection part for connecting the first electrode and the second electrode and preventing the first electrode and the second electrode from being electrically connected.
- At least a portion of the first electrode may be formed in a predetermined regular pattern.
- the comparison unit is arranged side by side in the longitudinal direction, and is formed of a steel material so that the first part and the second part and the third part extend from both ends of the first part.
- the control unit sets a point in time when the measured voltage coincides with the first voltage as a start point, and sets a point in time coincident with the second voltage as an end point, and at the first voltage based on the set start point and end point Calculating a reference charging time taken to reach the second voltage; And determining, by the control unit, a water level based on the calculated reference charging time, wherein the comparison unit uses
- a point in time when the measured voltage coincides with the first voltage is set as a start point of the reference charging time, and a point in time when the measured voltage coincides with the second voltage is an end of the reference charge time. It can be set as a viewpoint.
- the reference charging time taken to reach the second voltage from the first voltage is calculated based on the determined start time and end time, and the calculated reference charging time is converted into a capacitance. And the water level can be determined based on the converted capacitance.
- a charging time taken to reach a predetermined first voltage to a second voltage is calculated, the calculated charging time is converted into a capacitance, and the water level is determined based on the converted capacitance.
- the manufacturing cost can be reduced by a simple measurement method, and the reliability of the measurement result can be improved because the medium is not affected even by a simple structure.
- the embodiment it is possible to remarkably reduce the maintenance burden for simple product configuration, so it is easy to configure a water level measurement network in buildings, etc. by installing a large number of water gauges, and the reliability of flood measurement is improved due to the configuration of such a number measurement network. Can be improved.
- FIG. 1 is a view showing an apparatus for measuring a water level according to an embodiment of the present invention.
- FIG. 1 is diagrams illustrating a first shape of an electrode part shown in FIG. 1.
- 3A to 3B are diagrams illustrating a second shape of the electrode part shown in FIG. 1.
- FIG. 4 is a view showing a detailed configuration of the measuring device shown in FIG.
- 5A to 5C are diagrams for explaining a circuit implementing the comparison unit shown in FIG. 4 and an operating principle.
- 6A to 6C are diagrams showing the amount of change in electrostatic capacity according to the water level.
- FIG. 7A to 7B show a water level measuring apparatus actually implemented according to an embodiment of the present invention.
- FIG. 8 is a diagram showing a method for measuring a water level according to an embodiment of the present invention.
- ordinal numbers such as second and first, may be used to describe various elements, but the elements are not limited by the terms. These terms are used only for the purpose of distinguishing one component from another component. For example, without departing from the scope of the present invention, a second component may be referred to as a first component, and similarly, a first component may be referred to as a second component.
- the term and/or includes a combination of a plurality of related listed items or any of a plurality of related listed items.
- FIG. 1 is a view showing an apparatus for measuring a water level according to an embodiment of the present invention.
- an apparatus for measuring a water level may include an electrode unit 100 and a measuring device 200.
- the electrode unit 100 may include a pair of electrodes 110 and 120 disposed in the longitudinal direction.
- a pair of electrodes 110 and 120 are formed to be arranged side by side in the longitudinal direction, and the first electrode 110 connected to the (-) power source and the second electrode 120 connected to the (+) power source or (+) It may include a first electrode 110 connected to power and a second electrode 120 connected to (-) power.
- the first electrode 110 and the second electrode 120 may be spaced apart from each other by a predetermined interval and are disposed side by side in a length direction to form a capacitor capable of obtaining a capacitance. At this time, at least a portion of the first electrode 110 and the second electrode 120 is maintained in a state that is always submerged in water, and the capacitance may vary according to the level of the submerged water, that is, the length of the submerged part.
- the meter 200 is connected to the pair of electrodes 110, measures a voltage applied to the pair of electrodes 110, and calculates a charging time based on the measured voltage.
- the meter 200 may determine a start time point in which the measured voltage coincides with a first voltage set as a lower reference voltage, and an end time point coincides with a second voltage set as an upper reference voltage.
- the first voltage and the second voltage are preset threshold voltages, for example, the first voltage is 0.5V and the second voltage is 4.5V.
- the first voltage 0.5V, which is the lower reference voltage, and the second voltage 4.5V, which is the upper reference voltage are described as examples, and are not necessarily limited thereto and may be changed as necessary.
- the meter 200 may calculate a reference charging time based on the determined start time and end time, convert the calculated reference charging time into capacitance, and determine the level of the object to be measured based on the converted capacitance. .
- FIG. 1 is diagrams illustrating a first shape of an electrode part shown in FIG. 1.
- the electrode unit may include a pair of first electrodes 110 and second electrodes 120 spaced apart from each other and disposed side by side in a length direction.
- the first electrode 110 may be formed as a'U' shaped electrode.
- the first electrode 110 may be formed of an electrode made of an uncoated steel material such as stainless steel or an alloy material for preventing rust due to contact with water to withstand fluid pressure.
- the second electrode 120 is connected to both ends of the first electrode 110 and may be formed of a wire that is not covered with an insulating material.
- a conductor such as copper, aluminum, or silver may be used.
- connection unit 130 made of a material through which no current flows may be provided to be connected to each other.
- the connection part 130 may be formed of, for example, a plastic material.
- the first electrode 110 is divided into a first portion facing the second electrode 120 and a second portion and a third portion extending from both ends of the first portion, and the first portion is formed of a steel material.
- the second portion and the third portion may be formed of a material other than steel.
- (+) power may be connected to the first electrode 110 and (-) power may be connected to the second electrode 120.
- the (-) power may be connected to the first electrode 110.
- Power may be connected, and a (+) may be connected to the second electrode 120.
- 3A to 3B are diagrams illustrating a second shape of the electrode part shown in FIG. 1.
- the electrode unit according to an embodiment of the present invention includes a pair of first electrodes 110' and 110 ⁇ and second electrodes 120' and 120 ⁇ on top of the base film 100a. ) Can be arranged side by side in the longitudinal direction.
- the base film 100a may be, for example, a Teflon film.
- first electrodes 110 ′ and 110 ⁇ and the second electrodes 120 ′ and 120 ⁇ may be formed in the same shape or in different shapes.
- the first electrode 110 ′ and the second electrode 120 ′ may be formed in the same shape.
- the first electrode 110 ′ and the second electrode 120 ′ may be formed of wires.
- the first electrode 110 ⁇ and the second electrode 120 ⁇ may be formed in different shapes. At least a portion of the first electrode 110 ′ may be formed in a predetermined pattern.
- the predetermined pattern may be a regularly formed pattern. Since this predetermined pattern increases the band of capacitance, measurement accuracy can be improved.
- the first electrode 110 may be formed of an electrode made of an uncoated steel material such as stainless steel or an alloy material for preventing rust due to contact with water to withstand fluid pressure.
- the second electrode 120 may be formed of a thin film type wire that is not covered with an insulating material.
- positive power may be connected to the first electrodes 110 ′ and 110 ⁇
- negative power may be connected to the second electrodes 120 ′ and 120 ⁇
- a negative power may be connected to the first electrodes 110 ′ and 110 ⁇
- a positive power may be connected to the second electrodes 120 ′ and 120 ⁇ .
- FIG. 4 is a diagram showing a detailed configuration of the measuring device shown in FIG. 1, and FIGS. 5A to 5C are diagrams for explaining a circuit implementing the comparison unit shown in FIG. 4 and an operating principle.
- the measuring device 200 includes a comparison unit 210, a control unit 220, a communication unit 230, a charger/discharger 240, and a power supply unit 250. ) Can be included.
- the comparison unit 210 is connected to a pair of electrodes, that is, the voltage applied to the first electrode 110 and the second electrode 120 by being connected to one end of the first electrode 110 and the second electrode 120 in real time. Can be measured.
- the comparison unit 210 may accurately determine a time point when the measured voltage coincides with the first voltage and an exact time point when the measured voltage coincides with the second voltage by measuring the voltage in real time.
- a circuit for determining when the measured voltage coincides with the first voltage using a comparator and a circuit for determining when the measured voltage coincides with the second voltage are implemented.
- the comparator may be implemented to output a high signal when the input voltage matches the first voltage, and output a low signal when the input voltage does not match.
- the time when the voltage is measured coincides with the first voltage or the second voltage Since it may not be exactly the same, if the voltage applied in real time is directly input as an input value of the comparator as in the embodiment, it is possible to accurately determine the time point coincident with the first voltage or the second voltage.
- control unit 220 calculates a reference charging time based on the start time and end time determined by the comparison unit 210, and converts the calculated reference charging time into a capacitance to calculate the converted capacitance. You can determine the level of the object you want to measure as a basis.
- the communication unit 230 may wirelessly transmit the water level of the target determined by the control unit 220 to an external device, and may receive a control signal related to water level measurement from the external device.
- the charging/discharging unit 240 may charge or discharge voltages in the first electrode 110 and the second electrode 120.
- the power supply unit 250 may supply power.
- the power supply unit 250 may supply power for generating capacitance to the electrode as well as power for operating the control unit 220.
- 6A to 6C are diagrams showing the amount of change in electrostatic capacity according to the water level.
- a voltage applied to a pair of electrodes 110 and 120 may be measured and the measured voltage may be converted into a capacitance.
- the measured capacitance is proportional to the voltage, and it can be seen that the degree to which the voltage rises with time varies depending on the degree 1, 2, and 3 of the pair of electrodes 110 and 120 immersed in water.
- the water level may be determined based on a time from a predetermined lower reference voltage of 0.5V to an upper reference voltage of 4.5V, that is, a reference charging time.
- a time from 0.5V to 4.5V is determined as the reference charging time is described as an example, but the present invention is not limited thereto and may be changed as necessary.
- FIG. 7A to 7B show a water level measuring apparatus actually implemented according to an embodiment of the present invention.
- a water level measuring apparatus actually implemented according to an embodiment of the present invention, it is composed of an electrode unit 100 made of a pair of electrodes and a measuring device 200 for determining the water level.
- FIG. 7B an enlarged view of the electrode part 100 of FIG. 7A is shown.
- the electrode part 100 is located at both ends of the first electrode 110 and the first electrode 110 in the shape of a'c'.
- the second electrode 120 is connected.
- FIG. 8 is a diagram showing a method for measuring a water level according to an embodiment of the present invention.
- an apparatus for measuring a water level according to an embodiment of the present invention may measure the applied voltage when a voltage is applied to a pair of electrodes (S610). .
- the water level measuring device may check whether the measured voltage matches the first voltage set as the lower reference voltage (S620).
- the water level measurement apparatus may set a point in time coincident with the first voltage as a start point of the reference charging time (S640).
- the water level measuring device may store the set start time (S642).
- the water level measuring device may check whether the measured voltage matches the second voltage set as the upper reference voltage (S650).
- the water level measurement apparatus may set a point at which the converted voltage coincides with the second voltage as an end point of the reference charging time (S660).
- the water level measuring device may store the set end time (S662).
- the water level measuring apparatus may calculate a reference charging time taken to reach the first voltage to the second voltage based on the set start and end times (S670).
- the water level measuring device may convert the calculated reference charging time into capacitance.
- the water level measuring device may determine the water level based on the converted capacitance (S680). Then, the water level measuring device transmits the determined water level information of the object to be measured to an external device, so that the manager can check the water level information through the device.
- the water level measuring device can discharge all the voltages charged in the pair of electrodes.
- the reason for discharging the charged voltage is to measure the water level again later.
- the term' ⁇ unit' used in this embodiment refers to software or hardware components such as field-programmable gate array (FPGA) or ASIC, and' ⁇ unit' performs certain roles. However,' ⁇ part' is not limited to software or hardware.
- The' ⁇ unit' may be configured to be in an addressable storage medium, or may be configured to reproduce one or more processors.
- ' ⁇ unit' refers to components such as software components, object-oriented software components, class components and task components, processes, functions, properties, and procedures. , Subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, database, data structures, tables, arrays, and variables.
- components and functions provided in the' ⁇ units' may be combined into a smaller number of elements and' ⁇ units', or may be further divided into additional elements and' ⁇ units'.
- components and' ⁇ units' may be implemented to play one or more CPUs in a device or a security multimedia card.
- control unit 220 control unit
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Abstract
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Claims (10)
- 길이 방향으로 나란히 배치된 제1 전극 및 제2 전극을 포함하고, 상기 제1 전극과 상기 제2 전극에 전압이 인가되는 전극부;상기 제1 전극과 상기 제2 전극에 인가되는 전압을 측정하고, 상기 측정된 전압이 제1 전압과 일치하는 시점과 상기 제2 전압과 일치하는 시점을 판단하는 비교부; 및상기 측정된 전압이 제1 전압과 일치하는 시점을 시작 시점으로 설정하고 상기 제2 전압과 일치하는 시점을 종료 시점으로 설정하고, 상기 설정된 시작 시점과 종료 시점을 기초로 상기 제1 전압에서 상기 제2 전압까지 도달하는데 걸린 기준 충전 시간을 산출하고, 상기 산출된 기준 충전 시간을 기초로 수위를 결정하는 제어부를 포함하고,상기 제1 전극은 스틸 재질로 형성되어 제1 부분과 상기 제1 부분의 양단에서 각각 연장 형성된 제2 부분과 제3 부분으로 구분되는 ‘ㄷ’자 형태로 형성되고,상기 제2 전극은 전선으로 형성되어 상기 제1 전극의 상기 제2 부분과 상기 제3 부분의 끝단에 연결되고,상기 비교부는 비교기를 이용하여 상기 측정된 전압이 상기 제1 전압과 일치하는 시점을 판단하는 회로와 상기 측정된 전압이 상기 제2 전압과 일치하는 시점을 판단하는 회로로 구현된, 수위를 측정하기 위한 장치.
- 제1항에 있어서,상기 제1 전압은 0.5V이고, 상기 제2 전압은 4.5V인, 수위를 측정하기 위한 장치.
- 제1항에 있어서,상기 기준 충전 시간은 상기 수위가 높아질수록 길어지고, 상기 수위가 낮아질수록 짧아지는, 수위를 측정하기 위한 장치.
- 제1항에 있어서,상기 제어부는,상기 측정된 전압이 상기 제1 전압과 일치하는 시점을 상기 기준 충전 시간의 시작 시점으로 설정하고,상기 측정된 전압이 상기 제2 전압과 일치하는 시점을 상기 기준 충전 시간의 종료 시점으로 설정하는, 수위를 측정하기 위한 장치.
- 제4항에 있어서,상기 제어부는,상기 산출된 기준 충전 시간을 정전용량으로 환산하고,상기 환산된 정전용량을 기초로 상기 수위를 결정하는, 수위를 측정하기 위한 장치.
- 제1항에 있어서,상기 전극부는,상기 제1 전극과 상기 제2 전극을 연결하고, 상기 제1 전극과 상기 제2 전극이 전기적으로 연결되지 않도록 하는 연결부를 더 포함하는, 수위를 측정하기 위한 장치.
- 제1항에 있어서,상기 제1 전극의 적어도 일부분은 미리 정해진 규칙적인 패턴으로 형성된, 수위를 측정하기 위한 장치.
- 비교부가 길이 방향으로 나란히 배치되되, 스틸 재질로 형성되어 제1 부분과 상기 제1 부분의 양단에서 연장된 제2 부분과 제3 부분을 구분되는 ‘ㄷ’자 형태로 형성된 제1 전극과 전선으로 형성되어 상기 제1 전극의 상기 제2 부분과 상기 제3 부분의 끝단에 연결된 제2 전극에 인가되는 전압을 측정하는 단계;상기 비교부가 상기 측정된 전압이 제1 전압과 일치하는 시점과 상기 제2 전압과 일치하는 시점을 판단하는 단계;제어부가 상기 측정된 전압이 제1 전압과 일치하는 시점을 시작 시점으로 설정하고 상기 제2 전압과 일치하는 시점을 종료 시점으로 설정하고, 상기 설정된 시작 시점과 종료 시점을 기초로 상기 제1 전압에서 상기 제2 전압까지 도달하는데 걸린 기준 충전 시간을 산출하는 단계; 및상기 제어부가 상기 산출된 기준 충전 시간을 기초로 수위를 결정하는 단계를 포함하고,상기 비교부는 비교기를 이용하여 상기 측정된 전압이 상기 제1 전압과 일치하는 시점을 판단하는 회로와 상기 측정된 전압이 상기 제2 전압과 일치하는 시점을 판단하는 회로로 구현된, 수위를 측정하기 위한 방법.
- 제8항에 있어서,상기 산출하는 단계에서는,상기 측정된 전압이 상기 제1 전압과 일치하는 시점을 상기 기준 충전 시간의 시작 시점으로 설정하고,상기 측정된 전압이 상기 제2 전압과 일치하는 시점을 상기 기준 충전 시간의 종료 시점으로 설정하는, 수위를 측정하기 위한 방법.
- 제9항에 있어서,상기 산출하는 단계는,상기 산출된 기준 충전 시간을 정전용량으로 환산하고,상기 환산된 정전용량을 기초로 상기 수위를 결정하는, 수위를 측정하기 위한 방법.
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