JP2011163925A - Monitoring device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology capable of estimating and monitoring a salt injury with high probability even under a high-humidity environment. <P>SOLUTION: A monitoring device is equipped with: a pair of monitor electrodes arranged on a substrate comprising an insulator in parallel so as to leave a predetermined interval and generating migration on the basis of an applied voltage; the monitor measuring electrodes arranged on a substrate on the side where a pair of monitor electrodes are formed in parallel so as to leave an interval between a pair of the monitor electrodes; a measuring means for measuring the voltage between a monitor measuring electrode and one monitor electrode; and a detection means for detecting the advance degree of migration on the basis of a monitor voltage value. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a monitoring device that can predict and monitor salt damage to a monitored device.

  In recent years, with the high integration of circuits, the importance of countermeasures against salt damage to devices such as communication facilities installed near the coast has further increased. Technology has been developed that can predict and monitor salt damage before the device is damaged or malfunctioned by salt damage.

  In Patent Document 1, a pair of discharge electrodes having sharp pointed portions are provided on a glass to be monitored that is actually used, so that an actual machine insulator that is actually used without using a simulated insulator can be obtained. A technique is disclosed that can accurately detect in advance a situation in which discharge due to salt damage can occur.

JP 2008-175699 A

  However, in the conventional technology such as Patent Document 1, in the case of a pair of discharge electrodes arranged at the same interval as the circuit wiring interval of a monitoring target device such as a communication device, the monitoring target device or circuit is directly affected. There is a problem in the accuracy of detection that there is no discharge in a high-humidity environment or a small drop of water just because the interval is narrow.

  In view of the problems of the above-described conventional techniques, an object of the present invention is to provide a technique capable of predicting and monitoring salt damage with high accuracy even in a high humidity environment.

  In order to solve the above problems, a monitoring device according to the present invention includes a monitoring electrode pair arranged in parallel at a predetermined interval on a substrate made of an insulator and causing migration based on an applied voltage, and a monitoring electrode On the substrate on the side on which the pair is formed, a monitoring measuring electrode arranged in parallel with each other between the monitoring electrode pair and a voltage between the monitoring measuring electrode and one monitoring electrode are arranged between the monitoring electrode pair. Measuring means for measuring as a monitoring voltage value, and detecting means for detecting the progress of migration based on the monitoring voltage value.

  Further, a reference electrode and a monitoring electrode pair arranged in parallel with one monitoring electrode and in parallel with the other monitoring electrode at a predetermined interval are formed on the substrate on which the monitoring electrode pair is formed. A reference measurement electrode disposed in parallel with the monitoring measurement electrode between the other monitoring electrode and the reference electrode, and the detection means applies a voltage between the other monitoring electrode and the reference electrode. The voltage may be applied, the voltage between the reference measurement electrode and the reference electrode may be measured as a reference voltage value, and the progress of migration may be detected based on the monitoring voltage value and the reference voltage value.

  The other monitoring electrode may be silver-plated.

  The monitoring apparatus of the present invention is arranged on a substrate made of an insulator in parallel at a predetermined interval and causes a migration based on an applied voltage, and on the surface of the substrate between the monitoring electrode pair Measuring means for measuring the current flowing through the monitoring current value as a monitoring current value, and detecting means for detecting the progress of migration based on the monitoring current value.

  In addition, a reference electrode pair is arranged on the substrate on the side where the monitoring electrode pair is formed in parallel with the monitoring electrode pair and arranged in parallel at a predetermined interval. And the current flowing on the surface of the substrate between the pair of reference electrodes is measured as a reference current value, and the degree of progress of migration may be detected based on the monitored current value and the reference current value.

  According to the present invention, it is possible to predict and monitor salt damage with high accuracy even in a high humidity environment.

The circuit diagram of salt damage monitoring device 100 concerning one embodiment The circuit diagram of salt damage monitoring device 200 concerning the modification of one embodiment Circuit diagram of salt damage monitoring apparatus 300 according to another embodiment

<< One Embodiment >>
FIG. 1 is a circuit diagram showing a configuration of a salt damage monitoring apparatus 100 according to an embodiment of the present invention.

  A salt damage monitoring apparatus 100 according to this embodiment includes a sensor unit S, voltmeters 6 and 7, a voltage follower 8, a switch 9, a DC power supply 10, and a detection circuit 11. Note that the salt damage monitoring apparatus 100 according to the present embodiment is arranged in an apparatus to be monitored, is connected to a computer (not shown) and the like so as to be able to transmit information, and determines that there is a high possibility of failure due to salt damage. An alarm signal is output to (not shown).

  As shown in the figure, the sensor unit includes electrodes 1 to 5 arranged on a substrate made of an insulator (not shown) such as pottery or glass. The electrodes 1 to 5 are metal electrodes such as silver, copper, tin, lead, nickel, and gold.

  The electrode 2 faces a part of the electrode 1 and is arranged in parallel with a distance D. Further, an electrode 3 is disposed between the electrode 1 and the electrode 2 in parallel with the electrode 1 and the electrode 2 being spaced from each other. The electrode 3 is a measurement electrode for measuring a voltage value Vm between the electrode 2 and the voltmeter 6. On the other hand, the electrode 1 and the electrode 2 are applied with an output voltage V of a DC power source 10 to be described later, and according to moisture including seawater or water droplets adhering to a substrate (not shown), electrochemical migration (hereinafter referred to as ion migration). Wake up. In the present embodiment, in particular, the electrode 1 that is silver-plated on the entire electrode surface is used, and ion migration by the electrode 1 is caused to accelerate and proceed. As the ion migration of the electrode 1 proceeds, the surface resistance of the substrate (not shown) of the sensor unit changes, and the leak current flowing on the surface changes. The salt damage monitoring apparatus 100 according to the present embodiment detects the degree of ion migration progress of the electrode 1 based on the voltage value Vm measured by the voltmeter 6 and detects the salt damage of the monitoring target apparatus. Predictive monitoring.

  On the other hand, the electrode 4 of the sensor unit is arranged on a substrate (not shown) in parallel with the electrode 2 and in parallel with a part of the electrode 1 with a distance D therebetween. The electrode 5 is disposed in parallel with the electrode 3 between the electrode 1 and the electrode 4. The voltmeter 7 measures a voltage value Vr between the electrode 5 and the electrode 4 as a reference voltage for the degree of progress of ion migration by the electrode 1. For the voltmeters 6 and 7, a general DC voltmeter is appropriately selected and used.

  Note that the length of each electrode 1 to 5 and the interval D and the like can be appropriately determined according to the salt damage detection accuracy required for the salt damage monitoring device 100, the output voltage V of the DC power supply 10 to be applied, and the like. preferable. Further, only the sensor portion may be arranged to be removable.

  The voltage follower 8 is a voltage follower formed from an OP amplifier. In the present embodiment, according to the switching operation of the switch 9, the voltage follower 8 sets the electrode 4 of the sensor unit to the same potential as that of the electrode 1 in the normal state and to the same potential as that of the electrode 2 in the case of predictive monitoring of salt damage. Note that the switch 9 is formed of a general switch and performs a switching operation based on an instruction from the detection circuit 11.

  As the DC power source 10, a general DC power source can be appropriately selected and used. Note that the output voltage from the monitoring target device may be used as the DC power supply 10. Moreover, the DC power supply 10 of this embodiment outputs the output voltage V higher than the drive voltage of the monitoring object apparatus, and shall be adjusted according to the space | interval D of a sensor part. That is, although the voltage applied between the electrode 1 and the electrode 2 and the electrode 4 is high, the distance D between the sensor portions is larger than the size of water drops or dust adhering to the substrate (not shown), and silver plating is performed. Along with the effect of the acceleration of ion migration by the electrode 1, the same situation as in the case of an actual circuit wiring interval can be reproduced. Thereby, malfunction of salt damage detection due to high humidity or the like can be prevented, and salt damage can be predicted and monitored before the monitoring target device fails.

  The detection circuit 11 detects the degree of ion migration progress of the electrode 1 based on the voltage value Vm measured by the voltmeter 6 and predicts and monitors salt damage. The detection circuit 11 according to the present embodiment operates in cooperation with the voltmeter 7 and the switch 9 to obtain a difference between the voltage value Vm measured by the voltmeter 6 and the voltage value Vr measured by the voltmeter 7. The degree of progress of ion migration that eliminates the influence of high humidity and the like is detected.

  Next, the monitoring operation of the salt damage monitoring apparatus 100 will be described.

  The detection circuit 11 normally switches the switch 9 so that the electrode 4 is at the same potential as the electrode 1, and advances ion migration at the portion of the electrode 1 facing the electrode 2. On the other hand, no voltage is applied between the electrode 1 and the electrode 4. Therefore, in the portion of the electrode 1 facing the electrode 4, even if a high humidity environment such as seawater or a water droplet adheres to the substrate (not shown), ion migration does not proceed so much. Thereby, as the ion migration of the part of the electrode 1 facing the electrode 2 proceeds, the surface resistance between the electrode 1 and the electrode 2 becomes smaller than the surface resistance between the electrode 1 and the electrode 4. At the same time, the surface resistance between the electrode 1 and the electrode 3 closer to the electrode 1 becomes smaller between the electrode 3 and the electrode 2. That is, when the switch 9 is switched so that the electrode 4 and the electrode 2 are at the same potential during the salt damage prediction monitoring, the voltage value Vm between the electrode 3 and the electrode 2 measured by the voltmeter 6 is the voltage It means that the voltage value Vm between the electrode 5 and the electrode 3 measured by the total 7 becomes larger.

  On the other hand, at the time of predictive monitoring of salt damage, the detection circuit 11 switches the switch 9 so that the electrode 4 and the electrode 2 are at the same potential, and acquires the voltage values Vm and Vr measured by the voltmeters 6 and 7. The detection circuit 11 obtains the differential voltage ΔV = (Vm−Vr), compares it with the threshold value Vα, and detects the degree of progress of ion migration. When the differential voltage ΔV is equal to or higher than the threshold value Vα, the detection circuit 11 determines that there is a possibility that the ion migration proceeds and the device to be monitored may break down, and outputs an alarm signal to a computer (not shown). A computer (not shown) that has received the alarm signal displays a warning on a monitor or the like, for example, and notifies the operator to take necessary salt damage countermeasures for the monitored device.

  As described above, in the present embodiment, the ion migration proceeds between the electrode 1 and the electrode 2 and the ion migration does not proceed between the electrode 1 and the electrode 4, thereby affecting the influence of high humidity. The degree of progress of excluded ion migration can be detected, and salt damage can be predicted and monitored with high accuracy.

  Further, salt damage proceeds in the same manner as the device to be monitored, but the output voltage V of the DC power supply 10 higher than the maximum voltage for driving the device is applied between the electrode 1, the electrode 2 and the electrode 4 of the sensor unit. Thus, it is possible to predict and monitor salt damage with high accuracy before the device to be monitored fails.

  Furthermore, by using a silver-plated electrode 1, ion migration can be accelerated and salt damage can be predicted and monitored with higher accuracy before the monitoring target device fails.

In addition, since the sensor unit has a simple structure including the electrodes 1 to 5, the circuit scale can be easily reduced, and the cost can be reduced.
<< Modification of one embodiment >>
FIG. 2 is a circuit diagram showing a configuration of a salt damage monitoring apparatus 200 as a modification of the salt damage monitoring apparatus 100 according to one embodiment of the present invention.

  In the salt damage monitoring apparatus 200 according to the present embodiment, components that perform the same operations as the components of the salt damage monitoring apparatus 100 according to one embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  The salt damage monitoring apparatus 200 according to this embodiment is different from the salt damage monitoring apparatus 100 according to one embodiment in that the electrode 2 is arranged in parallel with the same length as the electrode 1 as shown in FIG. 4 is disposed between the electrode 1 and the electrode 2 together with the electrode 5. The electrode 4 operates as a guard electrode that suppresses ion migration in the portion of the electrode 1 facing the electrode 4 out of ion migration between the electrode 1 and the electrode 2 according to the switching operation of the switch 9. The electrode 4 of this embodiment is preferably arranged as close to the electrode 2 as possible so that the potential difference with the electrode 1 is substantially the same as the potential difference between the electrode 1 and the electrode 2. Since the operation of the salt damage monitoring apparatus 200 according to the present embodiment is the same as that of the salt damage monitoring apparatus 100 according to one embodiment, detailed description thereof is omitted.

  As described above, in the present embodiment, the ion migration proceeds between the electrode 1 and the electrode 2 and the ion migration does not proceed between the electrode 1 and the electrode 4, thereby affecting the influence of high humidity. The degree of progress of excluded ion migration can be detected, and salt damage can be predicted and monitored with high accuracy.

  Further, salt damage proceeds in the same manner as the device to be monitored, but the output voltage V of the DC power supply 10 higher than the maximum voltage for driving the device is applied between the electrode 1, the electrode 2 and the electrode 4 of the sensor unit. Thus, it is possible to predict and monitor salt damage with high accuracy before the device to be monitored fails.

  Furthermore, by using a silver-plated electrode 1, ion migration can be accelerated and salt damage can be predicted and monitored with higher accuracy before the monitoring target device fails.

In addition, since the sensor unit has a simple structure including the electrodes 1 to 5, the circuit scale can be easily reduced, and the cost can be reduced.
<< Other embodiments >>
FIG. 3 is a circuit diagram showing a configuration of a salt damage monitoring apparatus 300 according to another embodiment of the present invention.

  In the salt damage monitoring apparatus 300 according to the present embodiment, components that perform the same operations as the components of the salt damage monitoring apparatus 100 according to one embodiment are denoted by the same reference numerals and detailed description thereof is omitted.

  Differences between the salt damage monitoring apparatus 300 according to the present embodiment and the salt damage monitoring apparatus 100 according to one embodiment are as follows.

(1) The silver-plated electrode 1 of the sensor unit of this embodiment is divided into two silver-plated electrodes 1 and 1 ′. There are no electrodes 3 and 5. In addition,
(2) Using the ammeters 20 and 21 which are general DC ammeters, leakage current flowing between the electrodes 1 and 2 and between the electrodes 1 ′ and 4 on the surface of the substrate (not shown) Current values Im and Ir are measured.

  (3) As shown in FIG. 3, the detection circuit 22 detects the progress of ion migration of the electrode 1 based on the current value Im measured by the ammeter 20 and predicts and monitors salt damage. The detection circuit 22 according to the present embodiment operates in cooperation with the voltmeter 21 and the switch 9 to obtain a difference between the current value Im measured by the ammeter 20 and the current value Ir measured by the ammeter 21. The degree of progress of ion migration that eliminates the influence of high humidity and the like is detected.

  Next, the monitoring operation of the salt damage monitoring apparatus 300 according to this embodiment will be described.

  The detection circuit 22 normally switches the switch 9 so that the electrode 4 is at the same potential as the electrode 1 ′, and advances the ion migration of the electrode 1. On the other hand, the output voltage V of the DC power supply 10 is not applied between the electrode 1 'and the electrode 4 due to the switching operation of the switch 9, and the ion migration of the electrode 1' does not proceed so much.

  On the other hand, at the time of predictive monitoring of salt damage, the detection circuit 22 switches the switch 9 so that the electrode 4 and the electrode 2 are at the same potential, and acquires the current values Im and Ir measured by the ammeters 20 and 21. The detection circuit 22 obtains the differential current ΔI = (Im−Ir), compares it with the threshold value Iα, and detects the progress of ion migration. When the differential current ΔI is equal to or greater than the threshold value Iα, the detection circuit 22 determines that there is a possibility that the ion migration proceeds and the device to be monitored may break down, and outputs an alarm signal to a computer (not shown). A computer (not shown) that has received the alarm signal displays a warning on a monitor or the like, for example, and notifies the operator to take necessary salt damage countermeasures for the monitored device.

  As described above, in the present embodiment, by causing ion migration to proceed between the electrode 1 and the electrode 2 and preventing ion migration from proceeding between the electrode 1 ′ and the electrode 4, the influence of high humidity and the like is exerted. It is possible to detect the degree of progress of ion migration that excludes water and to predict and monitor salt damage with high accuracy.

  Moreover, although salt damage advances like the apparatus to be monitored, the output voltage V of the DC power supply 10 higher than the maximum voltage for driving the apparatus is between the electrodes 1 and 2 and the electrodes 1 ′ and 4 of the sensor unit. By applying, salt damage can be predicted and monitored with high accuracy before the device to be monitored fails.

  Furthermore, by using silver-plated electrodes 1 and 1 ', ion migration can be accelerated and salt damage can be predicted and monitored with higher accuracy before the device to be monitored fails.

Further, since the sensor unit has a simple structure composed of four electrodes, the circuit scale can be easily reduced and the cost can be reduced.
<< Additional items of embodiment >>
In the one embodiment, the differential voltage ΔV = (Vm−Vr) is obtained in order to more accurately perform the salt damage prediction monitoring by the detection circuit 11, but the present invention is not limited to this. For example, immediately after the monitoring device 100 is installed, the detection circuit 11 causes the voltmeters 6 and 7 to measure and hold the initial voltage values Vm0 and Vr0, and the differential voltage ΔV is (Vm−Vm0) − (Vr−Vr0). You may ask as. Thereby, more accurate prediction and monitoring of salt damage can be performed.

  In the other embodiment described above, the differential current ΔI = (Im−Ir) is obtained in order to more accurately perform the salt damage prediction monitoring by the detection circuit 22, but the present invention is not limited to this. For example, immediately after the monitoring device 300 is installed, the detection circuit 22 causes the ammeters 20 and 21 to measure and hold the initial current values Im0 and Ir0, and the differential current ΔI is (Im−Im0) − (Ir−Ir0). You may ask as. Thereby, more accurate prediction and monitoring of salt damage can be performed.

  From the above detailed description, features and advantages of the embodiments will become apparent. It is intended that the scope of the claims extend to the features and advantages of the embodiments as described above without departing from the spirit and scope of the right. Further, any person having ordinary knowledge in the technical field should be able to easily come up with any improvements and modifications, and there is no intention to limit the scope of the embodiments having the invention to those described above. It is also possible to use appropriate improvements and equivalents within the scope disclosed in.

1-5, 1 ′ electrode, 6, 7 voltmeter, 8 voltage follower, 9 switch, 10 DC power supply, 11, 22 detection device, 20, 21 ammeter, 100, 200, 300 salt damage monitoring device

Claims (5)

A pair of monitoring electrodes that are arranged in parallel at a predetermined interval on a substrate made of an insulator and cause migration based on an applied voltage;
On the substrate on the side where the monitoring electrode pair is formed, a monitoring measurement electrode disposed in parallel with the monitoring electrode pair with a space between each monitoring electrode pair;
Measuring means for measuring a voltage between the monitoring measuring electrode and one monitoring electrode as a monitoring voltage value;
Detecting means for detecting the degree of progress of the migration based on the monitoring voltage value;
A monitoring device comprising: The monitoring device according to claim 1,
On the substrate on the side where the monitoring electrode pair is formed, a reference electrode disposed in parallel with the one monitoring electrode and in parallel with the other monitoring electrode at the predetermined interval;
A reference measurement electrode disposed in parallel with the monitoring measurement electrode between the other monitoring electrode and the reference electrode on the substrate on which the monitoring electrode pair is formed;
The detection means includes
The voltage is applied between the other monitoring electrode and the reference electrode, the voltage between the reference measurement electrode and the reference electrode is measured as a reference voltage value, and the monitoring voltage value and the reference voltage value are The degree of progress of the migration is detected based on the monitoring device. The monitoring device according to claim 2,
The other monitoring electrode is silver-plated. A pair of monitoring electrodes that are arranged in parallel at a predetermined interval on a substrate made of an insulator and cause migration based on an applied voltage;
Measuring means for measuring a current flowing on the surface of the substrate between the monitoring electrode pair as a monitoring current value;
Detecting means for detecting the degree of progress of the migration based on the monitoring current value;
A monitoring device comprising: The monitoring device according to claim 4,
A reference electrode pair disposed in parallel with the monitoring electrode pair on the side on which the monitoring electrode pair is formed and disposed in parallel with the predetermined interval;
The detection means includes
The voltage is applied to the reference electrode pair, the current flowing on the surface of the substrate between the reference electrode pair is measured as a reference current value, and the migration is performed based on the monitoring current value and the reference current value. A monitoring device characterized by detecting the degree of progress.

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