WO1999067661A1 - Capteur encastre - Google Patents

Capteur encastre Download PDF

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Publication number
WO1999067661A1
WO1999067661A1 PCT/JP1999/003329 JP9903329W WO9967661A1 WO 1999067661 A1 WO1999067661 A1 WO 1999067661A1 JP 9903329 W JP9903329 W JP 9903329W WO 9967661 A1 WO9967661 A1 WO 9967661A1
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WO
WIPO (PCT)
Prior art keywords
detection
electrode
detection electrode
insulated
reference electrode
Prior art date
Application number
PCT/JP1999/003329
Other languages
English (en)
Japanese (ja)
Inventor
Ryochi Kato
Hideto Kato
Kunihide Kamiyama
Kiichi Seino
Original Assignee
Ks Techno Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ks Techno Co., Ltd. filed Critical Ks Techno Co., Ltd.
Priority to AU43916/99A priority Critical patent/AU4391699A/en
Publication of WO1999067661A1 publication Critical patent/WO1999067661A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices

Definitions

  • the present invention relates to a buried sensor, and more particularly to a buried sensor for detecting an object existing on the ground and an object existing on a floor of a building.
  • a loop coil sensor using a variation in a resonance frequency of a loop coil has been used as a detecting unit for detecting whether a vehicle is present in each parking space in a parking lot.
  • this loop coil sensor a loop coil formed by winding an electric wire about 4 to 6 times in a circular shape having a diameter of about 1 m to 2 m is buried horizontally in the ground of each section, and 100 A high frequency current of KHz to 50 O KHz is supplied to generate a magnetic field around the loop coil.
  • the inductance of the loop coil decreases due to the iron loss and the change in the magnetic permeability of the vehicle body.
  • a change in the frequency of the high frequency due to the decrease in the inductance is detected by a detection circuit, and it is detected whether or not a vehicle exists in each of the sections.
  • this loop coil sensor since this loop coil sensor generates a high frequency, the high frequency affects a telephone line, an electronic circuit, and the like around a parking lot, and there is a problem that the loop coil sensor becomes a noise source. Conversely, a noise source around the loop coil, for example, a noise generated from a spark plug of the vehicle is detected by a detection circuit connected to the loop coil, which causes a malfunction.
  • the present invention solves the above-described problems of the loop coil sensor and generates a magnetic field. It is an object of the present invention to provide an embedded sensor having excellent detection stability without using high frequency. Disclosure of the invention
  • the embedded sensor according to claim 1 is embedded in the ground or a building floor and is insulated from the ground or the building, and is embedded in the ground or the building floor and insulated from the ground or the building.
  • it has a reference electrode insulated from the detection electrode, and a detection circuit for detecting a change in capacitance between the detection electrode and the reference electrode caused by the presence of an object in the detectable region.
  • an object existing on the ground or on the floor can be detected as a change in capacitance between a detection electrode and a reference electrode embedded in the ground or the floor of a building, and the presence of the object can be detected. Therefore, the embedded sensor of the present invention does not need to generate a magnetic field by high frequency, and thus does not have the above-mentioned problems of the loop coil sensor at all.
  • dielectric polarization occurs in an insulator such as earth and sand between the detection electrode and the human.
  • the detection electrode and the reference electrode are insulated from the buried detection electrode and the earth and sand surrounding the reference electrode, the electric charge (polarization charge) generated by the dielectric polarization becomes an electric current and becomes a current. Does not move directly to the reference electrode.
  • this polarization charge forms an electric field in the earth and sand around the detection electrode. Electrostatic induction occurs at the detection electrode located in this electric field, and the capacitance between the detection electrode and the reference electrode increases. The detection of the increase in the capacitance by the detection circuit makes it possible to detect the intrusion of the person.
  • the buried sensor of the present invention connects the detection signal of the detection circuit to other control means to detect the presence or absence of a vehicle in each parking section of the above-mentioned parking lot, and to detect a security device for monitoring an intruder. It can also be used as an outgoing sensor.
  • the embedded sensor according to the present invention is particularly effective as a detection sensor for a security device because the embedded detection electrode and reference electrode cannot be found from the outside.
  • the object to be detected is not limited as long as it has a detectable capacitance, such as a human, an automobile, a vehicle, and an animal.
  • embedding means not only the case where the detection electrode and the reference electrode are buried with a single substance such as earth and sand, but also two types such as a floor composed of a tile and concrete fixing the back surface of this tile. This includes the case where the floor is made up of such materials and the case where the detection electrode and the reference electrode are buried inside this concrete.
  • burying includes the case where the burial is partially buried, and also includes the case where the burial is simply placed on the surface of the ground.
  • the embedded sensor according to claim 2 is provided such that at least a part thereof is disposed within a detection region of the detection electrode and a charging member insulated from the detection electrode and the reference electrode is provided. Things.
  • the detection electrode and the reference electrode are buried in earth and sand, if the earth and sand existing above these electrodes is blown up by wind and rain, etc., the volume of the earth and sand existing above these electrodes will increase. For this reason, even if the earth and sand existing above these electrodes is charged by the approach of humans, the charge is dispersed by the increased volume, and the polarization charge of the earth and sand around the detection electrodes decreases, and the predetermined strength No electric field is formed. For this reason, the detection circuit cannot detect the approach of a human.
  • the present invention uses a charging member having a predetermined volume and a predetermined conductivity or dielectric constant to stabilize the intensity of an electric field formed around a detection electrode caused by the presence of an object in a detectable region. And high detection accuracy can be maintained.
  • the charging member may be a conductor or an insulator.
  • the conductor is preferably made of aluminum or stainless steel, and the insulator is preferably made of natural stone such as marble, granite, granite, porcelain, concrete, or artificial stone. is there.
  • the embedded sensor according to claim 3 is characterized in that the charging member is a conductor and has a partitioning means made of an insulator.
  • the electric charge of the charging member becomes an electric current, and is arranged on the ground or a building around the charging member or adjacently. Movement to other charging members can be prevented.
  • the charging member is formed of an aluminum plate, and a synthetic resin is applied around the charging member to form an insulating layer. Therefore, the embedded sensor of the present invention is produced by the presence of an object within the detectable area. The strength of the electric field formed around the detection electrode can be stabilized.
  • a buried sensor according to claim 4 is characterized in that the charging member is an insulator, and that the charging member has a partitioning means made of a low-insulator having a smaller dielectric constant than the insulator.
  • the present invention provides an insulating charging member provided with partitioning means made of an insulator having a smaller dielectric constant than the charging member, so that the charge of the charging member is changed to the ground or building around the charging member, or Dispersion to other charging members disposed adjacent to the charging member can be prevented. Therefore, it is possible to stabilize the intensity of the electric field formed around the detection electrode caused by the presence of the object in the detectable region.
  • the insulator having a small dielectric constant means, for example, when the charging member of the insulator is a concrete material, a synthetic resin having a smaller dielectric constant than that of the concrete material. Is formed.
  • the embedded sensor according to claim 5 is characterized in that the partitioning means is provided with a residual charge dispersing means for dispersing the residual charge of the charging member to the outside.
  • the detection circuit may continue to transmit a detection signal due to the charge remaining on the charging member.
  • the air is dry and the intruder's body has a large charge. Therefore, the charge of the charging member charged by the human body also becomes large. At the same time, the atmosphere around the charging member is also dry, so that electric charges are hardly dispersed.
  • the present invention disperses the residual charge from the charging member to the ground or a building in a predetermined time by providing a residual charge dispersing means in the partitioning means, and prevents the detection circuit from continuing to transmit the detection signal. .
  • the embedded sensor according to claim 6 is characterized in that the charging member is provided with a water-repellent means.
  • the detection circuit when an embedded sensor is installed outdoors, if moisture penetrates into the charging member due to rainwater, etc., positive hydrogen ions facilitate the movement of charges in the charging member, and the charging member changes to a state close to a conductor . Therefore, the rate of increase (increase rate) of the static state capacitance and the charged state capacitance detected by the detection circuit relatively decreases. For this reason, the detection circuit must detect a relatively decreased rate of increase in capacitance, and it is necessary to improve the detection accuracy.
  • the present invention provides a water-repellent means on the non-buried portion to prevent moisture from penetrating into the charging member and maintain a high detection accuracy by maintaining a static charge amount of the charging member. can do.
  • the embedded sensor according to claim 7 is characterized in that the charging member is provided with drainage means.
  • the influence of moisture on the charging member can be reduced by providing the charging member with drainage means.
  • the drainage means is a means for increasing the drainage efficiency of the surface of the charging member by inclining the surface of the non-buried portion of the charging member or providing a groove or the like, and also makes the charging member itself porous. Means for increasing the drainage efficiency inside the charging member is also included.
  • An embedded sensor according to claim 8 is provided with directivity control means for limiting the direction of the line of electric force of the detection electrode.
  • the direction of the electric field lines of the detection electrode is limited to limit the detectable area to a predetermined range so that the detection electrode is not affected by the fluctuation of the electric charge in other areas. Can be.
  • the embedded sensor according to claim 9 is characterized in that the directivity control means is a shield electrode connected to the reference electrode.
  • the embedded sensor according to claim 10 is provided with at least one or more inter-electrode charging members that are disposed between the detection electrode and the reference electrode and are insulated from the detection electrode and the reference electrode. That is.
  • the sensitivity of the detection electrode can be stabilized, and the detection threshold value of the detection circuit can be set small. Therefore, the detectable area Can be expanded.
  • the detection electrode is composed of a first detection electrode and a second detection electrode that are insulated from each other, and the detection circuit is configured to detect a static between the first detection electrode and the reference electrode. It has comparison means for comparing the capacitance with the capacitance between the second detection electrode and the reference electrode.
  • the embedded sensor according to claim 12 is characterized in that the first detection electrode and the second detection electrode are arranged so that the distance to the object to be detected is different.
  • An embedded sensor according to claim 13 is a sensor in which the first detection electrode and the second detection electrode are provided side by side so that the detection areas are different from each other.
  • An electrode and a plurality of reference electrodes are connected to one detection circuit.
  • the embedded sensor according to the present invention can realize a wide detectable area at low cost by detecting a change in capacitance between a plurality of sets of detection electrodes and a reference electrode by one detection circuit.
  • the embedded sensor according to claim 15 is configured such that a plurality of detection electrodes and a plurality of reference electrodes are connected to one detection circuit via a capacitor.
  • the paving material described in claim 16 may include: a detection electrode insulated from the ground or a building; a reference electrode insulated from the ground or the building and insulated from the detection electrode; At least a part of the charging member is provided so as to be located at least, and has a charging member insulated from the detection electrode and the reference electrode.
  • pavement material according to claim 17 wherein a pavement material portion, a detection electrode, an insulating member, and a reference electrode are sequentially laminated, and the upper pavement material portion and the reference electrode are insulated, The detection electrode and the reference electrode are insulated from the ground or a building.
  • the pavement material according to claim 18 is formed by sequentially laminating an upper pavement material portion, a detection electrode, a first insulating member, a lower pavement material portion, a second insulating member, and a reference electrode.
  • the detection electrode and the reference electrode are insulated from the lower pavement portion, and the detection electrode and the reference electrode are connected to the ground or a building. It is insulated from things.
  • the pavement material according to claim 19, comprising a detection electrode, an insulating member, a reference electrode, and a pavement material portion sequentially laminated, wherein the upper pavement portion and the reference electrode are insulated, and The detection electrode and the pavement portion are insulated, and the reference electrode is insulated from the ground or a building.
  • the pavement material according to claim 23, wherein the water film separating means comprises: a main groove having a width of 6 mm or more and opening downward; and a sub-groove having a width of less than 6 mm and opening downward inside the main groove. It is to be prepared.
  • FIG. 1 is a perspective view of an embedded sensor according to the first embodiment of the present invention, and shows a state where an embedded sensor unit 1 is embedded below a plurality of flat plates 10.
  • FIG. 2 is a sectional view taken along line AA of FIG.
  • FIG. 3 is a block diagram showing a connection state between each unit 1 and the detection circuit 20 of the embedded sensor in FIG.
  • FIG. 4 is a circuit diagram of the detection circuit 20 of the embedded sensor of FIG.
  • FIG. 5 is an explanatory diagram showing electric lines of force E of the detection electrode plate 2 of the unit 1 of the embedded sensor of FIG.
  • Reference symbol R denotes a detection area of the detection electrode plate 2.
  • FIG. 6 is a block diagram showing another connection state between each unit 1 and the detection circuit 20 of the embedded sensor in FIG.
  • FIG. 7 is a perspective view of the embedded sensor according to the second embodiment of the present invention.
  • FIG. 8 is a perspective view of an embedded sensor according to the third embodiment of the present invention.
  • FIG. 9 is a perspective view of a pottery plate 60 that is a power-resistant member of the embedded sensor according to the fourth embodiment of the present invention.
  • FIG. 10 is a perspective view of an embedded sensor according to a fifth embodiment of the present invention.
  • FIG. 11 is a sectional view of a unit 70 of the embedded sensor of FIG.
  • FIG. 12 is a block diagram of the embedded sensor of FIG.
  • FIG. 13 is a plan view of an embedded sensor according to a sixth embodiment of the present invention. The top plate of case 101 has been removed.
  • FIG. 14 is a sectional view taken along line BB of FIG.
  • FIG. 15 is a vertical sectional view of a pavement material of an embedded sensor according to a seventh embodiment of the present invention.
  • FIG. 16 is a vertical sectional view of a pavement material of an embedded sensor according to an eighth embodiment of the present invention.
  • FIG. 17 is a vertical sectional view of a pavement material of an embedded sensor according to a ninth embodiment of the present invention.
  • FIG. 18 is a longitudinal sectional view of a pavement material of the embedded sensor according to the tenth embodiment of the present invention.
  • FIG. 19 is a vertical sectional view of a pavement material of the embedded sensor according to the eleventh embodiment of the present invention.
  • the embedded sensor according to a first embodiment of the present invention is a sensor for a security system provided on the ground around a building, and an alarm is activated when an intruder walks on the flat plate 10.
  • Reference numeral 1 denotes a buried sensor unit buried immediately below a flat plate 10 as a charging member.
  • the embedded sensor unit 1 has a detection electrode plate 2 which is a circular flat conductor, a reference electrode plate 3 which is a conductor disposed below the detection electrode plate 2, and a reference electrode It comprises a cylindrical shield plate 4 provided integrally with the electrode plate, and a case 5 filled with an insulator (not shown) for insulating the detection electrode plate 2 from the reference electrode plate 3 and the shield plate 4.
  • the flat plate 10 is composed of a main body 11 made of a concrete material, a water-repellent layer 12 applied to a surface of a portion of the main body 11 exposed to the ground, and an insulating material applied to a surface of a buried portion of the main body 11. layer 13 and a residual charge dispersing portion 14 in which the insulating layer 13 is cut to expose the main body 11.
  • the water-repellent layer 12 is for preventing moisture from penetrating into the inside of the flat plate 10 and uses a water-repellent material mainly composed of a synthetic resin.
  • the insulating layer 13 is formed of a synthetic resin having a lower dielectric constant than that of a concrete material.
  • the embedded sensor unit 1 is a set of four, and connects between the detection electrode plates and between the reference electrode plates, and is connected to the detection circuit 20.
  • the detection circuit 20 is further connected to a control circuit (not shown). When the control circuit receives the detection signal of the detection circuit 20, it activates an alarm.
  • the operation of the embedded sensor unit will be described.
  • the flat plate 10 of the insulator is charged due to the contact of the shoe sole of the intruder, and dielectric polarization occurs.
  • the electric charge (polarized electric charge) generated by the dielectric polarization forms an electric field on the back side of the flat plate 10, that is, on the contact surface with the unit 1.
  • the insulating layer 13 is formed around the buried portion of the main body 11 of the flat plate 10, the electric charge of the main body 11 caused by the induced polarization is transferred to the ground or another adjacent flat plate 10. You can Plih dispersing.
  • the shield plate 4 erected from the periphery of the reference electrode plate 3 surrounds the detection electrode plate 2 and functions as a directivity control means for limiting the direction of the electric flux lines of the detection electrode plate 3.
  • the shield plate 4 blocks electric lines of force extending horizontally from the periphery of the detection electrode plate 2. Therefore, the directivity of the lines of electric force of the detection electrode plate 2 is limited to only the back side of the flat plate 10, and the detection electrode plate 2 is affected by the change in the electric charge in the ground due to the ground current or the like, and the detection circuit 20 malfunctions.
  • the residual charge dispersing part 14 is a part where the earth and sand etc. under the ground are in direct contact with the main body 11 of the slab. is there. After the intruder walks on a flat plate 10, the charge provided by the intruder is dispersed into the ground for a predetermined time, and the residual charge remains inside the flat plate 10 for a long time. Can be prevented. Since the area of the residual charge dispersing portion 14 is extremely small as compared with the area on which the insulating layer 13 is provided, the charge of the flat plate 10 generated when the intruder walks on the flat plate 10 is obtained. The amount of scattered in the ground via the residual charge dispersion unit 14 does not affect the detection accuracy. Next, the detection circuit 20 will be described with reference to FIG.
  • the detection circuit 20 is composed of a pulse signal generation circuit 21 connected in series, a differential amplifier 22, a ⁇ 0 variable 23, and a comparator 24.
  • the pulse signal V 1 output from the circuit 20 is branched, and the pulse frequency of the branched pulse signal becomes lower due to an increase in the resistance 25 and the capacitance of the embedded sensor unit 1.
  • the differential amplifier 22 generates a noise signal V I and a pulse signal formed by a change in capacitance.
  • the difference of V2 is amplified, and the output V3 is converted to DC by the transformer 3.
  • the comparator 24 compares the output V 4 of the variable 3 with a preset detection threshold value, and if V 4 is larger than this threshold value, transmits a detection signal to the control circuit.
  • the desired detection area can be obtained by adjusting the force for adjusting the detection threshold value and the distance between the detection electrode plate 2 and the reference electrode plate 3 as to the size of the detection region R of the detection electrode plate 2. . Then, by adjusting the detection region R of the detection electrode plate 2, a predetermined distance from the surface of the flat plate 10 can be set as the detectable region. That is, this detectable area is the minimum area where the intruder touched the flat plate 10, that is, the intruder stepped on the slab, and by the above adjustment, the intruder approached the flat plate 10 by a predetermined distance. May also be detectable.
  • the unit 1 of the present embodiment four units 1 are connected to the detection circuit 20.
  • the total capacitance of the four units 1 is calculated between the detection electrode plate 2 and the reference electrode plate 3 of one unit 1. 4 times the capacitance. That is, it can be regarded as a state where four capacitors are connected in parallel.
  • the ratio (increase rate) of the increase in the static state capacitance and the charged state capacitance detected by the detection circuit 20 of the present embodiment is simply that one unit 1 is one detection circuit. Compared to the case where it is connected to 20, it will be reduced to a quarter. For this reason, the detection circuit 20 must detect the rate of increase in the capacitance that has been reduced to one-fourth, and it is necessary to improve the detection accuracy.
  • unit groups 30 and 31 each having four units 1 are provided in parallel, and the detecting electrode plate 2 of each unit group is connected via the capacitors 32 and 34, and the reference electrode plate 3 is , And are connected to the detection circuit 20 via the capacitors 33 and 35.
  • the detection electrode plate 2 of one unit 1 of the unit group 30 increases its charge due to the above-mentioned charged state, this charge instantaneously becomes a current and the four detection electrode plates of the unit group 30 Disperse to 2.
  • the capacitors 32 and 34 prevent this charge from dispersing to the four detection electrode plates 2 of the unit group 31 as a current.
  • the increase rate of the capacitance substantially equal to that of this embodiment shown in FIG. Can be maintained.
  • Reference numeral 40 denotes a concrete flat plate, which is formed by integrally forming a detection electrode material 41 and a reference electrode material 42, each of which is a circular flat-plate-shaped wire mesh horizontally disposed inside.
  • the detection electrode material 41 and the reference electrode material 42 are separated from each other by a predetermined distance in the vertical direction, and a lead wire (not shown) is connected to each electrode material and provided on the back surface of the flat plate 40. Connect to detection circuit 20 via connector (not shown).
  • the flat plate 40 is provided with a groove 44 provided as a drainage means provided on the surface thereof, and a drain hole 45 provided at the intersection of the four grooves 40 so as to penetrate the flat plate 40 in a vertical direction.
  • a water-repellent layer (not shown) is formed on the surface of each block 43 partitioned by the groove 44, and an insulating layer (not shown) is formed on the back and side walls of the flat plate 43.
  • the drain hole 45 penetrates the insulating layer on the back surface of the flat plate 43, and the lower part of the inner wall of the drain hole 45 functions as a residual charge dispersing means for dispersing the residual charge to the outside.
  • the concrete material of the flat plate 40 located above the detection electrode material 41 functions as a charging member.
  • the detection electrode and the reference electrode are integrally provided on the charging member, there is no possibility of damaging the detection electrode and the reference electrode during construction, and the construction can be facilitated.
  • Reference numeral 50 denotes a pavement member including 16 granite blocks 53 and an FRP tray 51 containing the blocks 53 and sand for fixing the blocks.
  • This pavement member 50 is used in place of the flat plate 10 of the first embodiment. Therefore, the embedded sensor unit 1 (not shown) of the first embodiment is embedded on the back surface of the pavement member 50.
  • the tray 51 is an insulating means for the block 53 serving as a charging member.
  • a drain hole 52 serving as a water means is formed in the bottom surface of the tray 51, and the drain hole also functions as a residual charge dispersing means for dispersing the residual charge of the block 53 to the outside.
  • the whole of a plurality of relatively small blocks 53 can be used as one charging member. That is, the tray 51 indicates that the charges of the 16 blocks 53 stored in the tray 51 move to the 16 blocks 53 and the ground in another adjacent tray 51. ih. Therefore, stable detection accuracy can be secured.
  • Reference numeral 60 denotes a ceramic plate, which is composed of four charged portions 61 having a high dielectric constant, a low dielectric constant other than the charged portions, and an insulating portion 62.
  • the cylindrical charging section 61 is formed by mixing a substance having a high dielectric constant.
  • the ceramic plate 60 is a flat plate having a relatively large area, and each charging unit 61 constitutes an independent charging member.
  • On the back surface of the ceramic plate 60 four embedded sensor units 1 of the first embodiment are embedded, and each unit 1 is embedded immediately below each charging unit 61.
  • the charging section 61 by providing the charging section 61 as described above, a plurality of embedded sensor units 1 can be provided on one ceramic plate 60 having a relatively large area.
  • the charging section 61 is formed integrally with the ceramic plate 6 °, a plurality of charging members can be installed at a time, and the construction is easy.
  • the embedded sensor according to the present embodiment is a sensor for detecting the presence or absence of a vehicle in each parking section of a parking lot, and a flat plate 10 is provided on the floor of each I main vehicle section.
  • Reference numeral 70 shown in FIG. 10 denotes a cable-shaped sensor unit having a rectangular cross-sectional shape housed in a groove 81 provided on the back surface of a concrete flat plate 80.
  • the unit 70 is housed in a groove 81 of a plurality of flat plates 80 installed in series.
  • the unit 70 includes a case 71, a first detection electrode wire 72, a first inter-electrode charging wire 73, and a first reference electrode wire 74 stored in the case 71.
  • a first electrode member composed of a first shield plate 75, a second detection electrode wire 76, a second inter-electrode charging wire 77, a second reference electrode wire 78, and a first It comprises a second electrode member constituted by a shield plate 79, an insulator (not shown) filled in the inside of the case 71, and a force.
  • the separation distance L1 between the first detection electrode line 72 and the first reference electrode line 74 is longer than the separation distance L2 between the second detection electrode line 76 and the second reference electrode line 78. Therefore, the first detection electrode line 72 is closer to the bottom surface 82 of the groove 81 of the flat plate 80 as the charging member than the second detection electrode line 76 is.
  • the first detection electrode line 72 is closer to the bottom surface 82 than the second detection electrode line 76, the bottom surface of the vehicle is completely horizontal and flat, and the distribution of the electric charge of the flat plate 80. Even when the voltage is completely uniform, the first detection electrode wire 72 is more likely to cause electrostatic induction. Therefore, in the charged state, the capacitance between the first detection electrode line 72 and the first reference electrode line 74 becomes static between the second detection electrode line 76 and the second reference electrode line 78. It becomes larger than electric capacity.
  • the inter-electrode charging wires 73 and 77 correspond to an inter-electrode charging member provided between the detection electrode and the reference electrode.
  • These bands S ⁇ 73, 77 are insulated from the detection electrode wires 72, 76 and the reference voltages 74, 78, respectively, and both charged wires 73, 77 are also insulated from each other. hand And is not electrically connected to any other members.
  • These charged wires 73, 77 supply or absorb electric charges to the respective detecting electrode lines 72, 76 according to the charge amount of the corresponding detecting electrode lines 72, 76. I do.
  • the charged wires 73 and 77 function as supply / absorption portions of electric charges to the corresponding detection electrode wires 72 and 76 respectively.
  • the first electrode member between the first detection electrode wire 72 and the first inter-electrode charged wire 73, and between the first inter-electrode charged wire 73 and the first reference electrode wire 74.
  • two capacitors connected in series are formed, and the capacitance at that location decreases. The same applies to the second electrode member. For this reason, noise caused by fluctuations in capacitance due to fluctuations in the external environment (temperature, humidity, ground current, vibration, etc.) is reduced.
  • the ratio of the signal to the noise generated by the external environment increases, and the stable detection sensitivity of both electrode members can be maintained. For this reason, it is possible to set the detection threshold value of the detection circuit small, and it is possible to enlarge the detection area of the detection electrode line.
  • the detectable area formed at a predetermined distance from the surface of the flat plate 80 can be expanded.
  • the shield plates 75 and 79 are directivity control means for limiting the directions of the electric lines of force of the corresponding detection electrode lines 72 and 76, respectively. These shield plates 75 and 79 are connected to the corresponding reference electrode wires 74 and 78, respectively, to eliminate the influence of earth current and also eliminate the influence between both electrode members. .
  • the detection circuit 90 of the present embodiment will be described with reference to FIG.
  • the detection circuit 90 includes a pulse signal generator 91, a variable resistor 92, a first variable delay circuit 93, a second variable delay circuit 94, and a phase discrimination circuit 95. .
  • the pulse signal output from the circuit 91 is branched to a first variable delay circuit 93 and a second variable delay circuit 94 via a variable resistor 92.
  • the first detection electrode line 72 is connected to the first variable delay circuit 93
  • the second detection electrode line 76 is connected to the second variable delay circuit 94.
  • Both variable delay circuits 93, 94 are input according to the magnitude of the capacitance between each detection electrode line 72, 76 connected to each, and each reference electrode line 74, 78.
  • the pulse signal is delayed and output to the phase discriminating circuit 95, which is a comparing means.
  • the phase discriminating circuit 95 compares the phases of the pulse signals output from the first variable delay circuit 93 and the second variable delay circuit 94, and when a phase shift of a predetermined threshold or more is detected, A detection signal is transmitted to a control circuit (not shown) that displays a parking state.
  • the operation of the present embodiment will be described.
  • a control circuit (not shown) in order to know the parking state of the parking lot
  • power is supplied to the detection circuit 90.
  • the capacitance between the first detection electrode line 72 and the first reference electrode 74 is the capacitance between the second detection electrode line 76 and the second reference electrode line. Therefore, the detection circuit 90 transmits a detection signal to the control circuit.
  • the detection circuit 20 If the detection circuit 20 according to the first embodiment is used for the embedded sensor according to the present embodiment, the parking state of the vehicle cannot be detected. Even if the operator turns on the control circuit and activates the detection circuit 20, when the vehicle is stopped, the capacitance of the detection electrode and the reference electrode does not increase and remains at a constant value. . That is, the detection circuit 20 can transmit the detection signal only when the capacitance between the detection electrode and the reference electrode changes, and when the detection target is a stationary object, the detection circuit 20 detects the detection signal. You cannot do it.
  • the detection circuit 90 of the present embodiment is configured such that the first detection electrode line 72 and the second detection electrode line Objects can be detected. If the distance to the object is different, the object can be detected even if it is moving. That is, the detection circuit 90 is a stationary object detection circuit and also a moving object detection circuit.
  • the difference in capacitance between the two detection electrode members is adjusted by the variable resistor 92 of the detection circuit 90, and the pulse signal by the phase discrimination circuit 95 Can be prevented from affecting the detection of the phase shift.
  • the embedded sensor according to the present embodiment is an embedded sensor for crime prevention, and is used by being embedded directly in the ground, and the detection circuit uses the detection circuit 90 according to the fifth embodiment.
  • the embedded sensor unit 100 includes a case 101, a first detection electrode plate 102 of a circular flat plate horizontally disposed in the center of the case 101, and a predetermined periphery of the first detection electrode plate. Between isolation The second detection electrode plate 104, which has a flat plate shape and is arranged so as to surround it, is provided separately below and directly below the first detection electrode plate 102, and has the same shape and shape as the first detection electrode plate 102. A first inter-electrode charging plate 10 3 and a second inter-electrode charging plate 10 5 having the same size and shape as the second detection electrode plate 104, which are provided directly below the second detection electrode plate 104 and the second detection electrode plate 104. And a reference electrode plate 106 provided separately and directly below the charging plates 103 and 105 between the two electrodes; and a cylindrical shenored plate 10 erectly provided on the periphery of the reference electrode plate 106. 7 and power.
  • the detection area of both detection electrode plates affected by the charge on the sole is as follows.
  • the area is S1 for the first detection electrode plate 102 and the area S2 for the second detection electrode plate 104.
  • the first detection electrode plate 102 is more strongly affected by the charge of the shoe sole than the second detection electrode plate 104. Accordingly, the electric charge of the first detection electrode plate 102 becomes larger than the electric charge of the second detection electrode plate 104, and the electrostatic charge between the first detection electrode plate 102 and the reference electrode plate 106 becomes larger.
  • the capacitance is larger than the capacitance between the second detection electrode plate 104 and the reference electrode plate 106. Then, this difference in capacitance is detected by the detection circuit 90, and an alarm is activated by transmitting a detection signal to the control circuit.
  • the embedded sensor according to the present embodiment uses the surface of concrete block 110 as a detection area.
  • the block 110 is composed of the upper concrete part 1 1 1, the detection electrode plate 1 1 5, the insulating plate 1 1 4 made of synthetic resin, the ground electrode plate 1 1 6, and the lower concrete section 1 1 2 Clearly.
  • the side and bottom surfaces of the block 110 are covered with an insulating layer 113 made of synthetic resin.
  • the synthetic resin insulating plate 1 1 4 stabilizes the capacitance between the detection electrode plate 1 1 5 and the ground electrode plate 1 1 6 and the electric charge of the upper concrete portion 1 1 1 is transferred to the lower concrete portion 1 1 2. It prevents movement and affects the charge on the ground electrode plate 116.
  • the block 110 of the embedded sensor according to the present embodiment is defined by a drain wall 119 serving as a water film separating means formed of urethane around the upper surface thereof.
  • a drain wall 119 serving as a water film separating means formed of urethane around the upper surface thereof.
  • the embedded sensor according to an eighth embodiment of the present invention uses the surface of the concrete block 120 as a detection area.
  • the block 120 is composed of an upper concrete part 121, a detection electrode plate 126, a synthetic resin insulating plate 124, a lower concrete part 122, and a synthetic resin second insulating plate 125,
  • the source electrode plates 127 are sequentially laminated.
  • the side and bottom surfaces of the block 120 are covered with an insulating layer 123 made of synthetic resin.
  • the capacitance between the detection electrode plate and the ground electrode plate in a static state can be reduced. Can be smaller.
  • the second insulating plate 125 electrically insulates the lower concrete part 122 from the ground electrode plate 127. For this reason, the electric charge of the ground electrode plate 127 is prevented from being dispersed in the lower concrete part 122 by the moisture contained in the lower concrete part 122. If the second insulating plate 125 is not present, the position of the ground electrode plate 127 is substantially the same as the state where the ground electrode plate 127 is disposed close to the detection electrode plate 126. Therefore, the above-mentioned basic capacitance cannot be reduced. In addition, the second insulating plate 125 allows the ground electrode plate 127 to be electrically stable regardless of the amount of water contained in the lower concrete portion 122, thereby providing a high stability of the detection circuit. Can be secured.
  • the embedded sensor according to a ninth embodiment of the present invention uses the surface of the non-slip block 130 as a detection area.
  • Anti-slip block 13 0 is a synthetic resin anti-slip plate with multiple projections 13 2 1 3 1, detection electrode plate 1 3 6, insulating plate 1 3 5, earth electrode plate 1 3 7, concrete part It consists of 1 3 3 stacked in order.
  • the side and bottom surfaces of the block 130 are covered with an insulating layer 133 made of synthetic resin.
  • the detection electrode plate and the ground electrode plate can be formed by bonding to the upper surface of the concrete portion 133, the manufacture is easy.
  • the ground electrode plate 13 7 and the concrete portion 13 3 need not necessarily be insulated. This is because the transfer of electric charge from the ground electrode plate 13 7 to the concrete portion 13 3 does not significantly affect the detection accuracy.
  • the embedded sensor according to a tenth embodiment of the present invention uses the left side surface of the block 140 in FIG. 18 and the surface of the block 140 as detection areas, and is installed on a stair, a step, or the like.
  • This embodiment differs from the seventh embodiment in that a force is different in that the block on the left side of the block is also used as a detection area, and other configurations are substantially the same.
  • This block 140 is composed of an upper concrete part 141, a detection electrode plate 144 bent vertically downward on the left side of the block, and a synthetic resin insulating plate 1 bent vertically downward on the left side of the block.
  • a ground electrode plate 146 which is bent vertically downward on the left side of the block, and a lower block portion 142, which are sequentially laminated.
  • the side and bottom surfaces of the block 140 except for the left side surface are covered with an insulating layer 144 made of synthetic resin.
  • a drain wall 148 serving as a water film separation means is provided on the left side of the bottom surface of the block.
  • the inner wall 149 of the drain wall 148 is located at a distance L from the foundation outer wall 150 below the block, and a groove is formed between the inner wall 149 and the outer wall 150. 1 4 9 is formed. This distance L is 6 mm or more.
  • the static capacitance in the static state rapidly increases. This is because the distance between the surfaces of both water films becomes extremely small. In this case, the detection circuit outputs a detection signal due to the rapid increase in the capacitance. That is, a malfunction occurs.
  • the water films are prevented from contacting each other. This is because, by setting the distance L of the groove 149 to 6 mm or more, the water film is prevented from being bonded across the groove 149 due to the surface tension of the water film. It is. Therefore, malfunction of the detection circuit is prevented.
  • the embedded sensor according to the present embodiment also uses the left side surface and the front surface of the block as the detection area, similarly to the block of the tenth embodiment.
  • This embodiment is different from the eighth embodiment in that the block on the left side of the block is also used as a detection area, but other configurations are substantially the same. It is like.
  • the block 160 is composed of an upper concrete part 161, a detection electrode plate 1664 which is bent vertically downward on the left side of the block, and a synthetic resin material which is bent vertically downward on the left side of the block.
  • the side and bottom surfaces of the block 160 except the left side surface are covered with an insulating layer 163 made of synthetic resin.
  • a draining member 170 as a water film separating means is provided on the left side of the block bottom surface.
  • the upper inner wall surface 17 2 of the draining member 17 0 is located at a distance L 2 from the outer wall 180, and a sub-groove 1 7 3 is located between the ⁇ wall surface 17 2 and the outer wall 180. Are formed.
  • the distance L2 is 1 mm or more and less than 6 mm.
  • the value of 1 mm or more is a value larger than the thickness of the water film, and the value of less than 6 mm is a value smaller than L1 described below.
  • the lower inner wall 1 7 1 of the draining member 1 7 0 is located at a distance L 1 from the outer wall 1 8 0, and a main groove 1 7 4 is provided between the inner wall 1 7 1 and the outer wall 1 8 0. Is formed.
  • This distance L1 is 6 mm or more.
  • the embedded sensor according to the present invention can be mainly used as a security sensor for detecting an intruder or the like.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Electromagnetism (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

On décrit un capteur encastré qui présente une excellente stabilité et qui, pour générer un champ magnétique, n'utilise aucune onde radioélectrique haute fréquence. Ce capteur comprend une électrode (2) de détection qui est noyée dans le sol ou dans le plancher d'un bâtiment et isolée par rapport au sol ou au bâtiment, une électrode (4) de référence qui est noyée dans le sol ou dans le plancher et isolée par rapport au sol ou au plancher et par rapport à l'électrode (2) de détection, une plaque plate (10) servant d'élément de charge, une couche hydrofuge (12) formée sur le corps (11) de la plaque plate (10), une couche isolante (13) prévue sur la surface de la partie noyée du corps (11), une partie (14) dispersant la charge résiduelle prévue sur la surface de la partie noyée du corps (11), un circuit (20) de détection qui détecte la modification de la capacitance entre l'électrode (2) de détection et l'électrode (3) de référence provoquée par la présence d'un objet dans la zone de détection du capteur.
PCT/JP1999/003329 1998-06-23 1999-06-23 Capteur encastre WO1999067661A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU43916/99A AU4391699A (en) 1998-06-23 1999-06-23 Embedded sensor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP10/191005 1998-06-23
JP19100598 1998-06-23

Publications (1)

Publication Number Publication Date
WO1999067661A1 true WO1999067661A1 (fr) 1999-12-29

Family

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Application Number Title Priority Date Filing Date
PCT/JP1999/003329 WO1999067661A1 (fr) 1998-06-23 1999-06-23 Capteur encastre

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Country Link
AU (1) AU4391699A (fr)
WO (1) WO1999067661A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002140771A (ja) * 2000-07-13 2002-05-17 Omron Corp セキュリティシステムおよびこのセキュリティシステムに用いるセンサ装置
JP2005284480A (ja) * 2004-03-29 2005-10-13 Asahi Kasei Homes Kk 敷地内防犯システム
JP2006092393A (ja) * 2004-09-27 2006-04-06 Toa Corp エリア侵入物検知装置、面検知型感圧ユニット及び防犯システム
JP2008083382A (ja) * 2006-09-27 2008-04-10 Fuji Xerox Co Ltd 接続構造、画像表示装置及び画像表示システム
JP2020505617A (ja) * 2017-01-13 2020-02-20 フランクリン センサーズ インコーポレイテッドＦｒａｎｋｌｉｎ Ｓｅｎｓｏｒｓ Ｉｎｃ． 難視構成を均一の電界で検出する装置及び方法
JP2020517956A (ja) * 2017-04-27 2020-06-18 フランクリン センサーズ インコーポレイテッドＦｒａｎｋｌｉｎ Ｓｅｎｓｏｒｓ Ｉｎｃ． 難視構成を検出する装置及び方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06194453A (ja) * 1992-12-22 1994-07-15 Matsushita Electric Works Ltd フットスイッチ
JPH06194456A (ja) * 1992-12-22 1994-07-15 Matsushita Electric Works Ltd 駐車センサ
JPH09145850A (ja) * 1995-11-22 1997-06-06 Koushiyoku Kagaku Kk 静電容量型物体検知センサおよびその物体検知センサを用いた自動扉開閉装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06194453A (ja) * 1992-12-22 1994-07-15 Matsushita Electric Works Ltd フットスイッチ
JPH06194456A (ja) * 1992-12-22 1994-07-15 Matsushita Electric Works Ltd 駐車センサ
JPH09145850A (ja) * 1995-11-22 1997-06-06 Koushiyoku Kagaku Kk 静電容量型物体検知センサおよびその物体検知センサを用いた自動扉開閉装置

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002140771A (ja) * 2000-07-13 2002-05-17 Omron Corp セキュリティシステムおよびこのセキュリティシステムに用いるセンサ装置
JP2005284480A (ja) * 2004-03-29 2005-10-13 Asahi Kasei Homes Kk 敷地内防犯システム
JP2006092393A (ja) * 2004-09-27 2006-04-06 Toa Corp エリア侵入物検知装置、面検知型感圧ユニット及び防犯システム
JP4559807B2 (ja) * 2004-09-27 2010-10-13 ティーオーエー株式会社 エリア侵入物検知装置、面検知型感圧ユニット及び防犯システム
JP2008083382A (ja) * 2006-09-27 2008-04-10 Fuji Xerox Co Ltd 接続構造、画像表示装置及び画像表示システム
JP2020505617A (ja) * 2017-01-13 2020-02-20 フランクリン センサーズ インコーポレイテッドＦｒａｎｋｌｉｎ Ｓｅｎｓｏｒｓ Ｉｎｃ． 難視構成を均一の電界で検出する装置及び方法
JP2020517956A (ja) * 2017-04-27 2020-06-18 フランクリン センサーズ インコーポレイテッドＦｒａｎｋｌｉｎ Ｓｅｎｓｏｒｓ Ｉｎｃ． 難視構成を検出する装置及び方法

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