EP0638160A1 - Dispositif de deminage. - Google Patents
Dispositif de deminage.Info
- Publication number
- EP0638160A1 EP0638160A1 EP94904680A EP94904680A EP0638160A1 EP 0638160 A1 EP0638160 A1 EP 0638160A1 EP 94904680 A EP94904680 A EP 94904680A EP 94904680 A EP94904680 A EP 94904680A EP 0638160 A1 EP0638160 A1 EP 0638160A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- capacitor
- coil
- voltage source
- circuit
- capacity
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
- 239000003990 capacitor Substances 0.000 claims abstract description 64
- 230000003213 activating effect Effects 0.000 abstract 1
- 230000004913 activation Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 6
- 230000006870 function Effects 0.000 description 4
- 230000010355 oscillation Effects 0.000 description 4
- 238000013016 damping Methods 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- VIKNJXKGJWUCNN-XGXHKTLJSA-N norethisterone Chemical compound O=C1CC[C@@H]2[C@H]3CC[C@](C)([C@](CC4)(O)C#C)[C@@H]4[C@@H]3CCC2=C1 VIKNJXKGJWUCNN-XGXHKTLJSA-N 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
- F41H11/00—Defence installations; Defence devices
- F41H11/12—Means for clearing land minefields; Systems specially adapted for detection of landmines
- F41H11/16—Self-propelled mine-clearing vehicles; Mine-clearing devices attachable to vehicles
Definitions
- the field of the present invention is that of demining devices, and more particularly that of devices intended to initiate a mine with magnetic influence from a distance.
- Such devices are known, for example from patent DE3444037. They include a magnetic field generating coil which is fixed to the front part of a demining vehicle, for example a tank. This coil is connected to an electrical supply circuit which supplies a current making it possible to generate the magnetic field. Generally the electrical supply circuit makes it possible to give the supply current a shape such that the magnetic field generated by the coil is close to that of the vehicle to be simulated.
- the shape of the current is provided by an electronic memory which controls a power generator.
- the invention also makes it possible to provide in a simple manner a magnetic field close to the field generated by a real vehicle. It is therefore no longer necessary to have recourse to an electronic memory controlling a power generator as in the device described by DE3444037.
- the invention therefore thus provides a simpler demining device (therefore more rustic and less expensive) than known devices, without such a simplification causing degradation of demining performance.
- the subject of the invention is a demining device intended to initiate a mine with magnetic influence from a distance and comprising a coil generating a magnetic field and an electrical supply circuit for the latter, this device characterized in that the circuit of power supply includes a capacity mounted in parallel on the terminals of the coil and switch means for connecting and disconnecting this capacity to a voltage source.
- the switch means periodically ensure a sequence comprising a connection followed by a disconnection.
- the switch means comprise a transistor whose Drain (D) is connected to the capacitor and the Source (S) is connected to the voltage source, the base (G) of this transistor receiving voltage slots provided by an electronic control circuit.
- the capacity consists of two electrochemical capacities mounted in series and connected to one another by one of their electrodes of the same sign, each capacity being short-circuited by a diode allowing current to flow through an opposite direction to that of the capacity considered.
- the voltage source comprises a capacitor and the switch means are contactor means which ensure, when the capacitor is disconnected, the connection of the capacitor to a load supply.
- FIG. 1 represents a block diagram of a demining device according to the invention
- FIG. 2 is a curve giving the shape of the current flowing in the coil of the device according to the invention
- FIG. 3 represents a diagram of a switch means used in the device according to the invention
- FIG. 4 represents a block diagram of a variant of a demining device according to the invention.
- FIG. 5 represents a block diagram of a second embodiment of a demining device according to the invention
- FIG. 6 presents two curves which give, for a device according to the second embodiment of the invention, on the one hand the charge intensity of the supply capacitor and on the other hand the shape of the current flowing in the coil,
- FIG. 7a represents a diagram of a switching means used in the device according to the second embodiment of the invention.
- FIG. 7b gives the form of the slots delivered by the command generator.
- a demining device 1 comprises a coil 2 formed in a known manner by winding a wire 3 on a support 4
- the support is intended to be made integral with the front part d 'a vehicle not shown.
- the connection is made by means of, for example, flanges (not shown).
- the ends 3a and 3b of the coil wire constitute the terminals of the coil 2.
- a supply circuit 5 of this coil comprises a capacitor 6, which is mounted in parallel on the terminals
- the capacitor 6 is connected to a voltage source 7 by means of switch means 8.
- FIG. 2 represents the current I flowing in the coil 2 as a function of time t.
- the switch means 8 are actuated so as to connect the voltage source 7 to the capacitor 6.
- the circuit constituted by the capacitor 6 and the coil 2 then becomes an oscillating circuit, the current which circulates in the coil is sinusoidal of damped amplitude.
- the shape of the current obtained makes it possible to generate in the coil a magnetic field of similar shape and which approaches the magnetic signature of a real vehicle.
- a time t2 it is possible to connect the capacitor again to the voltage source 7 for a new duration tl, then to open the circuit again.
- a coil will preferably be chosen such that its ratio R / 2L (where R is the resistance of the coil and L its inductance) is between 8 and 12. Such values make it possible to obtain coils whose the damping time constant is between 80 and 120 milliseconds.
- capacitance C such that the free oscillation frequency of the capacitance-coil circuit is between 10 and 20 Hz.
- a capacitance of the order of 0.01 Farad gives satisfaction for a coil whose inductance is of the order 50 milli Henry.
- the duration tl chosen will be of the order of 200 milliseconds, or approximately two damping time constants of the coil.
- the circuit will then be left to oscillate for 5 to 10 periods of the capacity-coil oscillating circuit (i.e. between 0.5 and 1 second for a frequency of 10 Hz).
- the device thus described consumes less energy than the known devices. Indeed, it takes from the voltage source 7 the power necessary to establish the current in the coil during tl. Then, until t2, the power it takes from the voltage source is zero.
- the power saving obtained with the device according to the invention can be greater than or equal to 50%. It will depend in a way general characteristics of the coil. With the values given previously by way of example, the power saving is of the order of 70%.
- FIG. 3 represents a diagram of switch means 8 which can be used in the device according to the invention.
- the coil 2 is shown schematically in this figure.
- These switching means 8 comprise a transistor 11 of the MOS ("Metal Oxide Semiconductor") type, the Drain (D) of which is connected to the capacitor 6 and the Source (S) of which is connected to the voltage source 7.
- MOS Metal Oxide Semiconductor
- the base (Gate G) of the transistor 11 receives signals supplied by an electronic control circuit 12.
- the latter is supplied by the voltage source 7 and it delivers a signal consisting of voltage slots of width equal to tl and of period equal to t2.
- the control circuit 12 also includes a switch (not shown here) and allowing the device to be started or stopped.
- a switch not shown here
- Such a control circuit which generates slots is well known to those skilled in the art and will not be described here in more detail.
- the amplitude of the voltage slots will be adapted to the characteristics of the MOS transistor 11, it is usually of the order of 5 volts.
- a resistor 13 connects the base G to the voltage source 7, its function is to adapt the impedance of the control circuit 12 with the GAS of the MOS.
- the operation of these switching means is as follows: when the control circuit 12 is put into operation, it delivers a signal comprising slots of duration tl which follow one another with a period t2. The rising edge of the first slot, applied to the base G of the transistor 11, allows the passage of current from the Source S to the Drain D.
- the switch means 8 then ensure the connection of the capacitor 6 to the voltage source 7.
- the capacity 6 is then charged by the voltage source 7 as described above.
- the base G of the transistor 11 receives the falling edge of the first slot provided by the control circuit 12.
- switch means 8 could be envisaged, for example a static relay or an electromechanical relay.
- FIG. 4 represents an alternative embodiment of the device according to the invention. It will be advantageous for relatively high capacity values to use electrochemical capacities. These are polarized and therefore cannot work for both positive and negative half-waves of the current flowing in the coil.
- the capacity 6 is replaced by two electrochemical capacities 6a and 6b which are connected in series and connected to one another by one of their electrodes of the same sign, here the negative electrodes 9a and 9b.
- Each capacitor is short-circuited by a diode 10a, 10b which allows current to flow in the opposite direction to that of the capacitor considered.
- the current curve flowing in the coil 2 which is obtained with this variant is of the same type as that described previously with reference to FIG. 2.
- the capacitors When connecting the capacitors to the voltage source 7, the latter will charge the capacitor 6b.
- the capacitor 6a will be charged during the first oscillation of the oscillating circuit constituted by the capacitors and the coil.
- FIG. 5 represents a second embodiment of the device according to the invention.
- the voltage source consists of a capacitor 14.
- the switching means are switching means 15, that is to say means which ensure on the one hand the connection and disconnection of the capacitor 6 to the voltage source constituted by the capacitor 14, and on the other hand the connection of the capacitor 14 to a load supply 16, when the capacity 6 is disconnected.
- the switch 15 connects the capacitor 14 to the load supply 16 (which is for example constituted by a battery).
- the upper curve 17 represents the variations in the charging current Ie of the capacitor 14 over time. This current reaches its maximum Icmax at the end of time t'O.
- the capacitor 14 then ensures the charging of the capacitor 6 for the duration t'1-t'O.
- the current flowing in the coil 2 increases to a maximum value Imax which is reached at the end of time t'1-t'O (see lower curve 18).
- the capacitor 14 discharges completely in the capacitor 6 and the coil 2.
- the switching means 15 are actuated so as to disconnect the capacitor 14 from the capacitor 6.
- the circuit constituted by the capacitor 6 and the coil 2 then becomes an oscillating circuit, the current which circulates in the coil is sinusoidal of damped amplitude.
- the shape of the current obtained makes it possible to generate in the coil a magnetic field of similar shape and which approaches the magnetic signature of a real vehicle.
- the capacitor 14 is again connected to the power supply 16 and it recharges (see curve 17).
- the charging time will be chosen such that it is possible to reconnect the capacitor 14 to the coil 2 after a time t'2-t'l. This connection will be made for a new duration t'1-t'O necessary for establishing the current in the coil, the capacitor 14 is then again disconnected from the capacitor 6.
- the capacitor 14 will in all cases have a capacity Cl greater than that C of the capacity 6.
- the value of Cl will be determined as a function of the inductance L and the resistance R of the coil 2 so that the circuit formed by the capacitor 14 and the coil 2 is critical aperiodic which means that Cl will be such that LC1 is equal to (2L / R) 2 .
- a capacitor 14 can be chosen whose capacitance Cl is of the order of 0.1 Farad.
- the charge time t'1-t'O is always of the order of 200 milliseconds, ie approximately two damping time constants of the coil.
- the circuit oscillates for 5 to 10 periods of the capacity-coil oscillating circuit (i.e. between 0.5 and 1 second for a frequency of 10 Hz).
- This oscillation time is sufficient to allow recharging of the capacitor 14 by the load supply 16.
- the device according to this second embodiment of the invention consumes less energy than the known devices. However, it consumes more energy than the device according to the first embodiment, this mainly due to the losses caused during the discharge of the capacitor 14 in the capacitor 6.
- the battery constituted the voltage source 7 connected to the capacitor 6, it saw a current of the order of 20 amperes.
- the battery constitutes the charge supply 16. It is then connected to the capacitor 14 for a longer period (of the order of 100%) which makes it possible to limit the intensity delivered by the 10 Amp battery.
- FIG. 7a represents an example of switching means 15 usable in this second embodiment.
- These switching means comprise two MOS type transistors 20 and 21, the respective bases Gl and G2 each of which receive a different control signal supplied by a command generator 22.
- the command generator 22 also includes a switch (not shown) intended to enable the device to be started and stopped.
- the transistor 20 receives a signal S1 and the transistor 21 a signal S2.
- the command generator 22 is supplied with energy by the load supply 16 (constituted for example by a vehicle battery).
- Resistors 23 and 24 are arranged between the bases G1 and G2 of the transistors 20 and 21 and the load supply 16. Their function is to adapt the impedance of the control generator 22 with the bases of the transistors.
- the transistor 20 is intended to ensure the connection of the capacitor 14 to the load supply, the transistor 21 makes it possible to connect the capacitor 14 to the coil 2 (shown diagrammatically).
- FIG. 7b shows the signals SI and S2 which are applied by the command generator 22 to the transistors 20 and 21.
- the signal SI top curve
- the signal S2 curve bottom
- the two signals have the same period equal to t'I.
- the amplitude of the voltage slots is adapted to the characteristics of the MOS transistors, it is usually of the order of 5 volts.
- the transistor 20 makes the connection of the capacitor 14 and of the load supply 16. This connection is maintained for the duration t'0 which allows the charging of the capacitor 14 (see FIG. 6).
- the transistor 21 receives no signal at its base G2 and therefore isolates the capacitor 14 from the coil 2.
- the transistor 20 becomes insulating while the transistor 21 receives the rising edge of the first slot of the signal S2.
- the transistor 21 then makes the connection of the capacitor 14 to the coil 2 and this for the time t'1-t'0, time necessary for the establishment of the current in the coil 2.
- the transistor 21 becomes insulating again, allowing the damped sinusoidal regime to be established in the circuit constituted by the capacitor 6 and the coil 2.
- the signal SI has commanded the connection of the capacitor 14 and the load supply 16, thus allowing the latter to be recharged.
- the switching cycle can be repeated indefinitely.
- Switches 15 could be envisaged, for example using static relays or electromechanical relays.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Charge By Means Of Generators (AREA)
- Control Of Eletrric Generators (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
- Paper (AREA)
- Surgical Instruments (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
- Geophysics And Detection Of Objects (AREA)
- Locating Faults (AREA)
- Insulators (AREA)
- Current-Collector Devices For Electrically Propelled Vehicles (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9301039A FR2701105B1 (fr) | 1993-02-01 | 1993-02-01 | Dispositif de déminage. |
FR9301039 | 1993-02-01 | ||
PCT/FR1994/000050 WO1994018520A1 (fr) | 1993-02-01 | 1994-01-14 | Dispositif de deminage |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0638160A1 true EP0638160A1 (fr) | 1995-02-15 |
EP0638160B1 EP0638160B1 (fr) | 1997-10-15 |
Family
ID=9443582
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94904680A Expired - Lifetime EP0638160B1 (fr) | 1993-02-01 | 1994-01-14 | Dispositif de deminage |
Country Status (10)
Country | Link |
---|---|
US (1) | US5458063A (fr) |
EP (1) | EP0638160B1 (fr) |
AT (1) | ATE159342T1 (fr) |
DE (1) | DE69406220T2 (fr) |
DK (1) | DK0638160T3 (fr) |
ES (1) | ES2110218T3 (fr) |
FR (1) | FR2701105B1 (fr) |
GR (1) | GR3025869T3 (fr) |
IL (1) | IL108485A (fr) |
WO (1) | WO1994018520A1 (fr) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2730557B1 (fr) * | 1995-02-10 | 1997-04-11 | Giat Ind Sa | Mine d'exercice, dispositif de programmation et dispositif de simulation mettant en oeuvre une telle mine |
DE19514569A1 (de) * | 1995-04-20 | 1996-10-24 | Wegmann & Co Gmbh | An einem Trägerfahrzeug, insbesondere einem Kampfpanzer, installierte Such- und Räumeinrichtung für Landminen, sowie Verfahren zur Ortung und Zerstörung einer Landmine mittels dieser Such- und Räumeinrichtung |
DE19619135C2 (de) * | 1996-05-11 | 1999-03-25 | Rheinmetall Ind Ag | Unbemanntes gepanzertes Minenräumfahrzeug |
FR2750204B1 (fr) * | 1996-06-19 | 1998-08-07 | Giat Ind Sa | Bobine de deminage et dispositif de deminage en faisant application |
US5665934A (en) * | 1996-07-31 | 1997-09-09 | The United States Of America As Represented By The Secretary Of The Army | Armed-state detector for antitank mines |
FR2771165B1 (fr) | 1997-11-14 | 1999-12-31 | Giat Ind Sa | Munition de deminage |
US6064209A (en) * | 1998-05-18 | 2000-05-16 | Xtech Explosive Decontamination, Inc. | Apparatus and process for clearance of unexploded ordinance |
US6484617B1 (en) | 1999-05-10 | 2002-11-26 | Alliant Techsystems Inc. | Assembly and process for controlled burning of landmine without detonation |
FR2849178B1 (fr) * | 2002-12-18 | 2007-04-27 | Giat Ind Sa | Dispositif tractable de deminage en surface et de marquage de l'itineraire demine |
FR2867634B1 (fr) | 2004-03-12 | 2008-07-04 | Giat Ind Sa | Procede de transmission de donnees et dispositif mettant en oeuvre un tel procede |
FR2873437B1 (fr) * | 2004-07-23 | 2006-11-10 | Giat Ind Sa | Dispositif de protection de vehicule militaire ou civil face aux mines a detection magnetique |
US7775146B1 (en) | 2006-08-02 | 2010-08-17 | Xtreme Ads Limited | System and method for neutralizing explosives and electronics |
US8683907B1 (en) | 2011-09-07 | 2014-04-01 | Xtreme Ads Limited | Electrical discharge system and method for neutralizing explosive devices and electronics |
US9243874B1 (en) | 2011-09-07 | 2016-01-26 | Xtreme Ads Limited | Electrical discharge system and method for neutralizing explosive devices and electronics |
ES2566978B1 (es) * | 2014-10-16 | 2017-01-31 | Bernardo DÍAZ MARTÍNEZ | Dispositivo de control de la floculación en una corriente de lodos o fangos y sistema para controlar la floculación mediante la adición de reactivo floculante en dicha corriente de lodos o fangos |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3040658A (en) * | 1948-04-13 | 1962-06-26 | Wilson R Maltby | Induction controlled mine firing mechanism |
US3170399A (en) * | 1951-05-18 | 1965-02-23 | Jr Wilbur S Hinman | Radio remote control mine circuit with no current drain |
US3835784A (en) * | 1956-07-23 | 1974-09-17 | Us Army | Mine fuze |
US3707913A (en) * | 1969-07-31 | 1973-01-02 | W Lee | Pulsed-energy detonation system for electro explosive devices |
US4993325A (en) * | 1970-06-02 | 1991-02-19 | The United States Of America As Represented By The Secretary Of The Navy | Magnetic field generator |
US3921530A (en) * | 1971-05-05 | 1975-11-25 | Us Navy | Electrical trip wire switch |
US4012641A (en) * | 1975-12-05 | 1977-03-15 | The United States Of America As Represented By The Secretary Of The Navy | Portable pulsed signal generator |
US4938136A (en) * | 1976-01-19 | 1990-07-03 | The United States Of America As Represented By The Secretary Of The Navy | Resonant acousticmagnetic minisweeper |
JPS6086400A (ja) * | 1983-10-19 | 1985-05-15 | 日本油脂株式会社 | 電気発破方法及び電気発破装置 |
JPS60111900A (ja) * | 1983-11-22 | 1985-06-18 | 日本油脂株式会社 | 遠隔制御段発発破装置 |
EP0174115B1 (fr) * | 1984-09-04 | 1989-07-26 | Imperial Chemical Industries Plc | Procédé et appareil pour l'allumage à distance à sécurité accrue d'amorces pyrotechniques |
DE3444037A1 (de) * | 1984-12-03 | 1986-06-12 | Honeywell Gmbh, 6050 Offenbach | Raeumeinrichtung fuer minen mit magnetsensor |
US4884506A (en) * | 1986-11-06 | 1989-12-05 | Electronic Warfare Associates, Inc. | Remote detonation of explosive charges |
SE467819B (sv) * | 1990-01-22 | 1992-09-21 | S A Marine Ab | Saett och anordning foer styrning av flerelektrodsvep |
US5027709A (en) * | 1990-04-26 | 1991-07-02 | Slagle Glenn B | Magnetic induction mine arming, disarming and simulation system |
IL102256A (en) * | 1992-06-18 | 1996-03-31 | Israel Aircraft Ind Ltd | Remote blasting means, especially for neutralizing vehicles |
-
1993
- 1993-02-01 FR FR9301039A patent/FR2701105B1/fr not_active Expired - Lifetime
-
1994
- 1994-01-14 US US08/295,837 patent/US5458063A/en not_active Expired - Lifetime
- 1994-01-14 AT AT94904680T patent/ATE159342T1/de not_active IP Right Cessation
- 1994-01-14 WO PCT/FR1994/000050 patent/WO1994018520A1/fr active IP Right Grant
- 1994-01-14 ES ES94904680T patent/ES2110218T3/es not_active Expired - Lifetime
- 1994-01-14 DK DK94904680.9T patent/DK0638160T3/da active
- 1994-01-14 DE DE69406220T patent/DE69406220T2/de not_active Expired - Lifetime
- 1994-01-14 EP EP94904680A patent/EP0638160B1/fr not_active Expired - Lifetime
- 1994-01-31 IL IL10848594A patent/IL108485A/en not_active IP Right Cessation
-
1998
- 1998-01-12 GR GR980400041T patent/GR3025869T3/el unknown
Non-Patent Citations (1)
Title |
---|
See references of WO9418520A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO1994018520A1 (fr) | 1994-08-18 |
EP0638160B1 (fr) | 1997-10-15 |
FR2701105A1 (fr) | 1994-08-05 |
DE69406220T2 (de) | 1998-04-16 |
ATE159342T1 (de) | 1997-11-15 |
US5458063A (en) | 1995-10-17 |
ES2110218T3 (es) | 1998-02-01 |
DE69406220D1 (de) | 1997-11-20 |
DK0638160T3 (da) | 1998-05-25 |
FR2701105B1 (fr) | 1995-04-14 |
GR3025869T3 (en) | 1998-04-30 |
IL108485A (en) | 1998-12-27 |
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