Conductivity measuring device
阅读说明:本技术 一种电导率测量装置 (Conductivity measuring device ) 是由 董剑峰 李辉 黄升 汤杰 段欣念 于 2019-10-10 设计创作,主要内容包括:本发明公开了一种电导率测量装置,池体用于放置被测液体,电压部与第一电极、第二电极连接,用于通过第一电极、第二电极向池体内被测液体施加电压,电流输出电路与第一电极、第二电极连接,用于通过第一电极、第二电极采集池体内被测液体的电流并将得到的电流信号传输给数据处理部;电压输出电路与第三电极、第四电极连接,用于通过第三电极、第四电极采集池体内被测液体的电压并将得到的电压信号传输给数据处理部;数据处理部用于根据得到的电压信号、电流信号运算出被测液体的电导率测量结果。本电导率测量装置采用四电极式,能够同步地采集电压信号和电流信号,进而运算出被测液体的电导率结果,与现有技术相比能够提高电导率测量精度。(The invention discloses a conductivity measuring device, wherein a cell body is used for placing a measured liquid, a voltage part is connected with a first electrode and a second electrode and is used for applying voltage to the measured liquid in the cell body through the first electrode and the second electrode, and a current output circuit is connected with the first electrode and the second electrode and is used for collecting the current of the measured liquid in the cell body through the first electrode and the second electrode and transmitting the obtained current signal to a data processing part; the voltage output circuit is connected with the third electrode and the fourth electrode and is used for collecting the voltage of the liquid to be detected in the cell body through the third electrode and the fourth electrode and transmitting the obtained voltage signal to the data processing part; the data processing part is used for calculating the conductivity measurement result of the measured liquid according to the obtained voltage signal and current signal. The conductivity measuring device adopts a four-electrode type, can synchronously acquire voltage signals and current signals, further calculates the conductivity result of the measured liquid, and can improve the conductivity measuring precision compared with the prior art.)
1. The conductivity measuring device is characterized by comprising a cell body, a first electrode, a second electrode, a third electrode, a fourth electrode, a voltage part, a current output circuit, a voltage output circuit and a data processing part;
the cell body is used for placing a liquid to be measured, the voltage part is connected with the first electrode and the second electrode and is used for applying voltage to the liquid to be measured in the cell body through the first electrode and the second electrode, and the current output circuit is connected with the first electrode and the second electrode and is used for collecting the current of the liquid to be measured in the cell body through the first electrode and the second electrode and transmitting the obtained current signal to the data processing part;
the voltage output circuit is connected with the third electrode and the fourth electrode and is used for collecting the voltage of the liquid to be detected in the cell body through the third electrode and the fourth electrode and transmitting the obtained voltage signal to the data processing part;
and the data processing part is used for calculating the conductivity measurement result of the measured liquid according to the obtained voltage signal and current signal.
2. The conductivity measuring apparatus according to claim 1, wherein the voltage part is specifically configured to apply a positive voltage to the measured liquid in the cell body through the first electrode and the second electrode for a preset time period, and then apply a negative voltage to the measured liquid in the cell body through the first electrode and the second electrode for the preset time period.
3. The conductivity measuring apparatus according to claim 2, wherein the data processing section is configured to average a voltage signal acquired when a positive voltage is applied to the liquid to be measured and a voltage signal acquired when a negative voltage is applied to the liquid to be measured, average a current signal acquired when a positive voltage is applied to the liquid to be measured and a current signal acquired when a negative voltage is applied to the liquid to be measured, and calculate the conductivity measurement result of the liquid to be measured based on the voltage value and the current value obtained by averaging.
4. The conductivity measuring apparatus according to claim 2, wherein the voltage section outputs a positive voltage with an adjustable voltage magnitude, and the voltage section outputs a negative voltage with an adjustable voltage magnitude.
5. The conductivity measuring apparatus according to claim 1, wherein the current output circuit includes a current-voltage converting circuit, a first amplifying circuit, and an analog-to-digital converter, which are connected in this order;
the current-voltage conversion circuit is used for converting the acquired current signals into voltage signals;
the first amplifying circuit is used for amplifying the obtained voltage signal;
the analog-to-digital converter is used for performing analog-to-digital conversion on the voltage signal and transmitting the converted signal to the data processing part.
6. The conductivity measurement device according to claim 5, wherein the current output circuit further comprises:
the first filter is used for filtering noise of the voltage signal output by the current-voltage conversion circuit and transmitting the processed voltage signal to the first amplifying circuit;
and the first filter circuit is used for filtering the voltage signal output by the first amplifying circuit and transmitting the processed voltage signal to the analog-to-digital converter.
7. The conductivity measuring apparatus according to claim 1, wherein the voltage output circuit includes a differential input circuit, a second amplifying circuit, and an analog-to-digital converter, which are connected in this order;
the differential input circuit is used for carrying out differential processing on the acquired voltage signals;
the second amplifying circuit is used for amplifying the obtained voltage signal;
the analog-to-digital converter is used for performing analog-to-digital conversion on the voltage signal and transmitting the converted signal to the data processing part.
8. The conductivity measurement device according to claim 7, wherein the voltage output circuit further comprises:
the second filter is used for filtering noise of the voltage signal output by the differential input circuit and transmitting the processed voltage signal to the second amplifying circuit;
and the second filter circuit is used for filtering the voltage signal output by the second amplifying circuit and transmitting the processed voltage signal to the analog-to-digital converter.
9. The conductivity measuring apparatus according to any one of claims 1 to 8, further comprising a discharge circuit for discharging an electric charge from the electrode.
10. The conductivity measuring apparatus according to any one of claims 1 to 8, wherein the data processing section is further configured to adjust a gain multiple of the current output circuit or the voltage output circuit according to a currently obtained conductivity measurement result and a strength of the acquired analog signal.
Technical Field
The invention relates to the technical field of conductivity measurement, in particular to a conductivity measurement device.
Background
The conductivity sensor is used for measuring the conductivity of liquid, is a very important technology in the field of engineering technology research, is widely applied to human production and life, becomes an essential detection and monitoring device in industrial production and technical development such as electric power, chemical industry, environmental protection, food, semiconductor industry, ocean research and development and the like, and can be used for measuring and detecting industrial production water, human life water, seawater characteristics, electrolyte properties in batteries and the like.
The conductivity sensor may be classified into an electrode type conductivity sensor, an inductance type conductivity sensor, and an ultrasonic conductivity sensor according to a measurement principle and method. The electrode type conductivity sensor adopts a resistance measurement method according to the electrolytic conduction principle to measure the conductivity, and a measurement electrode of the electrode type conductivity sensor is represented as a complex electrochemical system in the measurement process. The inductive conductivity sensor measures the conductivity of the liquid according to the electromagnetic induction principle, and the ultrasonic conductivity sensor measures the conductivity according to the change of ultrasonic waves in the liquid. Of which the two sensors were most widely used in the past.
In the measurement process of the above-mentioned various conventional conductivity sensors, a voltage is applied to a conductivity cell, and in the process, the voltage is collected first, then a current is collected, and the conductivity is calculated according to the collected voltage and current, and the collected voltage and the collected current are not performed synchronously, so that the measurement accuracy of the conductivity is not high.
Disclosure of Invention
The invention aims to provide a conductivity measuring device which can improve the conductivity measuring precision.
In order to achieve the purpose, the invention provides the following technical scheme:
a conductivity measuring device comprises a cell body, a first electrode, a second electrode, a third electrode, a fourth electrode, a voltage part, a current output circuit, a voltage output circuit and a data processing part;
the cell body is used for placing a liquid to be measured, the voltage part is connected with the first electrode and the second electrode and is used for applying voltage to the liquid to be measured in the cell body through the first electrode and the second electrode, and the current output circuit is connected with the first electrode and the second electrode and is used for collecting the current of the liquid to be measured in the cell body through the first electrode and the second electrode and transmitting the obtained current signal to the data processing part;
the voltage output circuit is connected with the third electrode and the fourth electrode and is used for collecting the voltage of the liquid to be detected in the cell body through the third electrode and the fourth electrode and transmitting the obtained voltage signal to the data processing part;
and the data processing part is used for calculating the conductivity measurement result of the measured liquid according to the obtained voltage signal and current signal.
Preferably, the voltage part is specifically configured to apply a positive voltage to the measured liquid in the cell body through the first electrode and the second electrode for a preset time period, and then apply a negative voltage to the measured liquid in the cell body through the first electrode and the second electrode for the preset time period.
Preferably, the data processing unit is specifically configured to average a voltage signal acquired when a positive voltage is applied to the liquid to be measured and a voltage signal acquired when a negative voltage is applied to the liquid to be measured, average a current signal acquired when a positive voltage is applied to the liquid to be measured and a current signal acquired when a negative voltage is applied to the liquid to be measured, and calculate the result of measuring the conductivity of the liquid to be measured based on the voltage value and the current value obtained by averaging.
Preferably, the voltage of the positive voltage output by the voltage part is adjustable, and the voltage of the negative voltage output by the voltage part is adjustable.
Preferably, the current output circuit comprises a current-voltage conversion circuit, a first amplification circuit and an analog-to-digital converter which are connected in sequence;
the current-voltage conversion circuit is used for converting the acquired current signals into voltage signals;
the first amplifying circuit is used for amplifying the obtained voltage signal;
the analog-to-digital converter is used for performing analog-to-digital conversion on the voltage signal and transmitting the converted signal to the data processing part.
Preferably, the current output circuit further includes:
the first filter is used for filtering noise of the voltage signal output by the current-voltage conversion circuit and transmitting the processed voltage signal to the first amplifying circuit;
and the first filter circuit is used for filtering the voltage signal output by the first amplifying circuit and transmitting the processed voltage signal to the analog-to-digital converter.
Preferably, the voltage output circuit comprises a differential input circuit, a second amplifying circuit and an analog-to-digital converter which are connected in sequence;
the differential input circuit is used for carrying out differential processing on the acquired voltage signals;
the second amplifying circuit is used for amplifying the obtained voltage signal;
the analog-to-digital converter is used for performing analog-to-digital conversion on the voltage signal and transmitting the converted signal to the data processing part.
Preferably, the voltage output circuit further includes:
the second filter is used for filtering noise of the voltage signal output by the differential input circuit and transmitting the processed voltage signal to the second amplifying circuit;
and the second filter circuit is used for filtering the voltage signal output by the second amplifying circuit and transmitting the processed voltage signal to the analog-to-digital converter.
Preferably, a discharge circuit is further included for discharging the electrode.
Preferably, the data processing unit is further configured to adjust a gain multiple of the current output circuit or the voltage output circuit according to a currently obtained conductivity measurement result and strength of the acquired analog signal.
According to the technical scheme, the conductivity measuring device provided by the invention is characterized in that the measured liquid is placed in the cell body, the voltage part applies voltage to the measured liquid in the cell body through the first electrode and the second electrode, the current output circuit collects the current of the measured liquid in the cell body through the first electrode and the second electrode and transmits an obtained current signal to the data processing part, the voltage output circuit collects the voltage of the measured liquid in the cell body through the third electrode and the fourth electrode and transmits an obtained voltage signal to the data processing part, and the data processing part calculates the conductivity measuring result of the measured liquid according to the obtained voltage signal and current signal.
The conductivity measuring device adopts the four-wire electrode for measurement, can synchronously acquire the voltage signal and the current signal, further calculates the conductivity result of the measured liquid, can overcome the defects in the prior art, and can improve the conductivity measurement precision.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic view of a conductivity measuring apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a current output circuit according to an embodiment of the present invention;
FIG. 3 is a diagram of a voltage output circuit according to an embodiment of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a conductivity measuring device, which comprises a cell body, a first electrode, a second electrode, a third electrode, a fourth electrode, a voltage part, a current output circuit, a voltage output circuit and a data processing part, wherein the cell body is provided with a first electrode and a second electrode;
the cell body is used for placing a liquid to be measured, the voltage part is connected with the first electrode and the second electrode and is used for applying voltage to the liquid to be measured in the cell body through the first electrode and the second electrode, and the current output circuit is connected with the first electrode and the second electrode and is used for collecting the current of the liquid to be measured in the cell body through the first electrode and the second electrode and transmitting the obtained current signal to the data processing part;
the voltage output circuit is connected with the third electrode and the fourth electrode and is used for collecting the voltage of the liquid to be detected in the cell body through the third electrode and the fourth electrode and transmitting the obtained voltage signal to the data processing part;
and the data processing part is used for calculating the conductivity measurement result of the measured liquid according to the obtained voltage signal and current signal.
The conductivity measuring device of the embodiment is characterized in that a measured liquid is placed in a cell body, a voltage part applies voltage to the measured liquid in the cell body through a first electrode and a second electrode, a current output circuit collects current of the measured liquid in the cell body through the first electrode and the second electrode and transmits an obtained current signal to a data processing part, a voltage output circuit collects voltage of the measured liquid in the cell body through a third electrode and a fourth electrode and transmits an obtained voltage signal to the data processing part, and the data processing part calculates a conductivity measuring result of the measured liquid according to the obtained voltage signal and the obtained current signal.
The conductivity measuring device of the embodiment adopts the four-wire electrode for measurement, can synchronously acquire the voltage signal and the current signal, further calculates the conductivity result of the measured liquid, can overcome the defects in the prior art, and can improve the conductivity measurement precision.
The conductivity measuring device will be described in detail with reference to the accompanying drawings and specific embodiments. Referring to fig. 1, fig. 1 is a schematic diagram of a conductivity measuring apparatus according to an embodiment of the present invention, and as can be seen, the conductivity measuring apparatus includes a
The
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In one embodiment, the
Preferably, the voltage of the positive voltage output by the
Optionally, in a specific implementation, the
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Preferably, the first amplifying
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Optionally, referring to fig. 2, the
In a preferred embodiment, the
Further preferably, the conductivity measuring device of the present embodiment further includes a
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Specifically, in one embodiment, the work flow of the conductivity measuring device for performing one measurement is as follows:
s30: and the voltage part applies forward voltage to the liquid to be measured in the cell body, and measures current and voltage in real time for a preset time period.
S31: and the voltage part applies negative voltage to the liquid to be measured in the cell body and continues for a preset time period to measure the current and the voltage in real time.
S32: and calculating the conductivity measurement result of the measured liquid according to the obtained voltage signal and current signal.
S33: discharging the electric charge from the electrode in the cell body.
S34: and adjusting the gain multiple of the current output circuit or the voltage output circuit according to the current obtained conductivity measurement result and the acquired strength of the analog signal.
The above description provides a conductivity measuring device according to the present invention. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
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