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Method for measuring internal resistance of marine Ag/AgCl electric field sensor

A technology of electric field sensor and measurement method, which is applied to measurement devices, measurement of electrical variables, measurement of resistance/reactance/impedance, etc., can solve the problem that it is difficult to appear semi-circular patterns in impedance complex plane diagrams, and achieves simple and fast measurement methods and measurement results. Accurate, damage-reducing effects

Active Publication Date: 2015-11-25
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The internal resistance of a pair of electric field sensors is not simply the sum of the internal resistance of a single electric field sensor, because the resistance of other components in the entire system also needs to be considered; Fourth, when measuring the internal resistance of the electric field sensor prepared by electrochemical oxidation method , it is difficult to appear a semicircular pattern on the impedance complex plane

Method used

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  • Method for measuring internal resistance of marine Ag/AgCl electric field sensor
  • Method for measuring internal resistance of marine Ag/AgCl electric field sensor

Examples

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Effect test

Embodiment 1

[0031] A pair of Ag / AgCl electric field sensors prepared by electrolysis were placed close together in a 3.5% NaCl solution, and then placed in a thermostat at 20 °C for 3 days. After the temperature of the solution is stable and the range of the electric field sensor is stable, the electric field sensor, data acquisition instrument, ammeter, DC power supply, and resistance box are figure 1The connection method is connected to the circuit. The output voltage of the DC power supply is set to 0.1V, and the resistance value of the resistance box is set to a maximum value of 20KΩ. switch K is open, the measured V 1 =0.036mV, close the switch K, read the voltage value V of the data acquisition instrument quickly after the current is stable 2 =0.040mV, ammeter reading A=0.63μA, according to the formula R=U / I=|(V 2 -V 1 ) / A| Calculated resistance R=6.35Ω. Cut off the power supply, and record the time for the voltage value of the data acquisition instrument to drop from 0.04mV to...

Embodiment 2

[0036] A pair of Ag / AgCl electric field sensors prepared by electrolysis were placed close together in a 3.5% NaCl solution, and then placed in a thermostat at 20 °C for 3 days. After the temperature of the solution is stable and the range of the electric field sensor is stable, the electric field sensor, data acquisition instrument, ammeter, DC power supply, and resistance box are figure 1 The connection method is connected to the circuit. The output voltage of the DC power supply is set to 0.1V, and the resistance value of the resistance box is set to 20KΩ. switch K is open, the measured V 1 =0.035mV, close the switch K, read the voltage value V of the data acquisition instrument quickly after the current is stable 2 =0.039mV, ammeter reading A=0.63μA, according to the formula R=U / I=|(V 2 -V 1 ) / A| Calculated resistance R=6.35Ω. Cut off the power supply, and record the time for the voltage value of the data acquisition instrument to drop from 0.039mV to 0.035mV at the s...

Embodiment 3

[0041] A pair of Ag / AgCl electric field sensors prepared by electrolysis were placed close together in a 3.5% NaCl solution, and then placed in a thermostat at 20 °C for 3 days. After the temperature of the solution is stable and the range of the electric field sensor is stable, the electric field sensor, data acquisition instrument, ammeter, DC power supply, and resistance box are figure 1 The connection method is connected to the circuit. The output voltage of the DC power supply is set to 0.5V, and the resistance value of the resistance box is set to 20KΩ. switch K is open, the measured V 1 =0.031mV, close the switch K, read the voltage value V of the data acquisition instrument quickly after the current is stable (about 3 seconds) 2 =0.050mV, ammeter reading A=2.65μA, according to the formula R=U / I=|(V 2 -V 1 ) / A| Calculated resistance R=7.17Ω. After the data recording is completed, continue to energize the polarization, record the readings of the data acquisition ins...

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Abstract

The invention discloses a method for measuring an internal resistance of a marine Ag / AgCl electric field sensor. The method is characterized by comprising the following steps of soaking a pair of electric field sensors into NaCl solution with a concentration of 3.5% for 2-3 days, after a voltage difference is stabilized, measuring the voltage difference V1 of the electric field sensor by a data acquisition instrument; serially connecting a DC power supply, a variable resistance box, an ammeter and an electric field sensor, and parallelly connecting the data acquisition instrument with the electric field sensor; switching on the circuit, and recording the reading number V2 of the data acquisition instrument and the reading number A of the ammeter; and calculating a changing value between the previous voltage and the later voltage according to a formula U= the absolute value of (V2-V1), and obtaining the internal resistance R of the pair of the electrodes according to Ohm's law R=U / I= the absolute value of (V2-V1) / A. The method provided by the invention has advantages of controllable magnitude of the current which runs over the electric field sensor in measurement, no damage of the electric field sensor, short measurement time and no polarization of the electric field sensor.

Description

technical field [0001] The invention relates to a method for measuring internal resistance of an ocean electric field sensor, in particular to a method for measuring the internal resistance of an Ag / AgCl electric field sensor for ocean. Background technique [0002] The Ag / AgCl electric field sensor converts the surrounding electric field signal into the voltage signal of the electric field sensor, and inverts the change of the surrounding electric field through the change of the voltage signal. The Ag / AgCl electric field sensor has two phase interfaces in seawater, Ag|AgCl|Clˉ, Ag and AgCl on the electrode surface are respectively used as anode and cathode to participate in the reaction and tend to balance. The electrochemical reaction of the electrode is expressed as: [0003] Total reaction: AgCl Ag + +Cl - [0004] Cathode reaction: AgCl+e - Ag+Cl - [0005] Anodic reaction: Ag–e - +Cl - AgCl [0006] These two equilibrium reactions will reach equili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/14
Inventor 李予国柴方刚付玉彬
Owner OCEAN UNIV OF CHINA
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