EP0537812B1 - A position-disturbance sensor - Google Patents
A position-disturbance sensor Download PDFInfo
- Publication number
- EP0537812B1 EP0537812B1 EP19920202699 EP92202699A EP0537812B1 EP 0537812 B1 EP0537812 B1 EP 0537812B1 EP 19920202699 EP19920202699 EP 19920202699 EP 92202699 A EP92202699 A EP 92202699A EP 0537812 B1 EP0537812 B1 EP 0537812B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sensor
- contact
- capacitor
- upset
- voltage
- 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.)
- Expired - Lifetime
Links
- 239000003990 capacitor Substances 0.000 claims description 11
- 238000004880 explosion Methods 0.000 claims description 4
- 239000002360 explosive Substances 0.000 claims description 4
- 208000017740 grade III prostatic intraepithelial neoplasia Diseases 0.000 description 2
- 238000005474 detonation Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
- F42C19/00—Details of fuzes
- F42C19/06—Electric contact parts specially adapted for use with electric fuzes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H35/00—Switches operated by change of a physical condition
- H01H35/02—Switches operated by change of position, inclination or orientation of the switch itself in relation to gravitational field
Definitions
- the present invention relates to a position-disturbance sensor for sensing any position-disturbance or "upset" of the sensor from a predetermined rest position, including a housing and an easily movable contact means therein capable of moving randomly within the housing, even as a result of the slightest upset of the sensor housing from its rest position, to simultaneous contact with two electrical contact points of a plurality of electrical contact points being fixedly placed in the housing, and thereby, like a switch, close an electric contact between the two contact points, said contact closure being an indication of said position-disturbance or "upset" of the sensor.
- the sensor may for instance be placed on an object where one wishes to obtain an indication of any unauthorized displacement from a predetermined storage.
- the sensor may be placed on an explosive mine being buried in the ground, where any indication of an upset of the mine is arranged to initiate the detonation of the explosive charge of the mine.
- Sensors of the aforementioned kind are known in the market as so called tilt sensors.
- the known sensors are, however, not designed to distinguish between different types of upsets of the actual object, but they will indicate an upset of a buried object also at the slightest natural change of the inclination of the object, such that they for instance respond to natural ground sinks due to depressions in the land surface.
- DE-B1-2.709.397 discloses, according to the preamble of independent claim 1, a sensor capable of distinguishing between different types of upsets.
- this known sensor is not designed to avoid any indication of such upsets of the actual object that are caused by very rapid contact changes of the movable contact means, for instance if the upsets originate from an explosion at the vicinity of the object.
- the object of the present invention is, therefore, to provide an upset sensor of the kind mentioned by way of introduction, which gives indication of upset only upon sensing of a plurality of contact closures, such that natural tilts, for instance caused by ground sinks, will not give any upset indication.
- Another object of the invention is to provide an upset sensor of the kind mentioned by way of introduction, which is able to distinguish between contact changes of different rapidities, and which prevents indication of upset, if the upset originates from rapid contact changes caused by an explosion at the vicinity of the sensor.
- Fig. 1 is a schematical top view of a sensor head of an upset sensor according to the invention.
- Fig. 2 is an electric circuit diagram of an electronic circuit incorporated in the upset sensor of the invention.
- Fig. 1 shows an upset sensor 1 for sensing any upset of a buried, explosive land mine (not shown).
- the sensor 1 consists of a cylindrical housing (or cup) 2 having an easily movable contact means in the form of a metallic ball 3.
- the ball 3 rests on a surface 4 in the housing 2, and is surrounded by a ring of equally spaced, fixed contact points in the form of contact pins (twelve pins in the embodiment shown) denoted I (threes pins), II (six pins) and III (three pins), respectively, every pin being insulated from the surface 4 in the housing 2.
- the ball 3 can move very rapidly along the surface 3, if the mine (and thus the housing 2) is subjected to a push or an upset.
- the ball 3 may alternatively consist of a drop of mercury.
- the twelve contact pins I-III are, according to a predetermined pattern, connected to a respective one of contact terminals a , b and c , respectively.
- Contact terminal a to which the pins II are connected, serves as an input terminal of an electronic circuit 5 of the sensor 2, shown in Fig. 2.
- Contact terminal b to which the pins I are connected, is connected to a supply voltage +U1 volts.
- Contact pin c to which the pins II are connected, is connected to ground, but may, alternatively, have another voltage.
- the ball 3 of Fig. 1 can, as a response to any upset of the sensor housing 2, randomly move along the surface 4 in the housing 2 into simultaneous contact with two of the contact pins, i.e. with a pin I and a pin II, or alternatively with a pin II and a pin III.
- the contact pins are so arranged that the ball 3 cannot contact a pin 1 and a pin III simultaneously, since this would otherwise have resulted in a short-circuit via ground of the supply voltage.
- the ball 3 will obtain the same function as a switch, and is, therefore, shown as a switch contact 3' in Fig. 2.
- Contact 3' can have anyone of two different positions, i.e. a position where it contacts terminal b , i.e. where it connects the supply voltage U1 to input terminal a of circuit 5, and another position, where it contacts terminal c , i.e. where it connects input terminal a of the circuit to ground. These two positions correspond to the cases where the ball 3 contacts pin I and II, or pin II and III, respectively.
- Electronic circuit 5 contains, between terminals a and c , a series arrangement of a capacitor C1, a diode D1 which is coupled in its reverse direction (in relation to supply voltage U1) and a resistor R1, the electronic circuit also containing a parallel arrangement of a capacitor C2 and a resistor R2. These two arrangements are separated from each other by a diode D2 which is coupled in its conducting direction (in relation to the supply voltage).
- the voltage Ud across resistor R2, i.e. at terminal d in Fig. 2, is fed to a comparator 6, where the voltage Ud is compared with a preselected reference voltage Uref. If the voltage Ud is greater than or equal to the voltage Uref, an output signal will appear at output terminal e of the comparator, indicating an upset of the mine.
- time constant R2C2 must be so great that the discharge that occurs between the voltage peaks, is not greater than the respective charge addition.
- the sensitivity of the sensor may be varied as desired.
Description
Claims (3)
- A position-disturbance sensor for sensing any position-disturbance or "upset" of the sensor from a predetermined rest position, including a housing (2) and an easily movable metallic contact means (3) therein capable of moving randomly within the housing, even as a result of the slightest upset of the sensor housing from its rest position, to simultaneous contact with two electrical contact points of a plurality of electrical contact points (I-III) being fixedly placed in the housing, and thereby, like a switch (3'), close an electric contact between the two contact points, said contact closure being an indication of said position-disturbance or upset of the sensor, characterized in that, in order to provide the upset indication only as a result of a plurality of such contact closures, the contact points (I-III) are so connected to an electronic circuit (b) of the sensor that each one of said contact closures randomly either connects a supply voltage (U1) to the circuit or disconnects the supply voltage from the circuit, the circuit including a capacitor (C2) being dimensioned to, at each said connection of the supply voltage, receive a charge addition, but at each said disconnection of the supply voltage substantially not be discharged, such that the voltage (Ud) across the capacitor (C2) upon a certain number of connections of the supply voltage, has gradually reached a predetermined level (Uref) corresponding to said plurality of contact closures, the capacitor (C2) being connected in series with a second capacitor (C1) which is incorporated in a RC-circuit (R1, C1) which is so dimensioned that the second capacitor (C1) will not be substantially discharged during such rapid contact closures of the movable means that occur upon an upset of the sensor as a result of an explosion at the vicinity of the sensor, which non-appearing discharge of the second capacitor (C1) causes that a subsequent connection of the supply voltage (U1) across the circuit prevents any charging current from flowing in any appreciable degree through the two capacitors, and thus substantially prevents any charge addition to the first capacitor (C2).
- A sensor according to Claim 1, characterized in that the sensor housing (2) is rigidly connected to an explosive mine being buried in the ground.
- A sensor according to any preceding Claim, characterized by a voltage comparator (6) for detecting the voltage (Ud) across the first capacitor (C1) and comparing it with a reference voltage (Uref) corresponding to said predetermined level.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9102662 | 1991-09-16 | ||
SE9102662A SE469048B (en) | 1991-09-16 | 1991-09-16 | UPSET SENSOR |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0537812A2 EP0537812A2 (en) | 1993-04-21 |
EP0537812A3 EP0537812A3 (en) | 1995-03-15 |
EP0537812B1 true EP0537812B1 (en) | 1998-01-07 |
Family
ID=20383724
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19920202699 Expired - Lifetime EP0537812B1 (en) | 1991-09-16 | 1992-09-07 | A position-disturbance sensor |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0537812B1 (en) |
DE (1) | DE69223903D1 (en) |
SE (1) | SE469048B (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2295053A (en) * | 1994-05-04 | 1996-05-15 | Desmond Grant Cunningham | Switch |
GB2403067A (en) * | 2003-06-18 | 2004-12-22 | Thomas John Evans | Tilt switch |
DE102006062600B4 (en) | 2006-12-29 | 2023-12-21 | Endress + Hauser Flowtec Ag | Method for commissioning and/or monitoring an in-line measuring device |
JP4291858B2 (en) * | 2007-03-27 | 2009-07-08 | Okiセミコンダクタ株式会社 | Tilt position sensor and method of manufacturing tilt position sensor |
TWI627386B (en) * | 2016-06-03 | 2018-06-21 | 凌通科技股份有限公司 | Low cost position sensor and mobility device using the same |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3320303A1 (en) * | 1983-06-04 | 1984-12-06 | Prüftechnik Dieter Busch + Partner GmbH & Co, 8045 Ismaning | DEVICE FOR GENERATING AN ELECTRIC CONCENTENCE SIGNAL WHEN A ROTATING BODY IS IN A PARTICULAR ANGLE POSITION |
DE8711783U1 (en) * | 1987-08-31 | 1987-10-15 | Honeywell Regelsysteme Gmbh, 6050 Offenbach, De | |
US4833281A (en) * | 1988-05-27 | 1989-05-23 | Lectron Products, Inc. | Motion detector |
DE3902629A1 (en) * | 1989-01-30 | 1990-08-02 | Dynamit Nobel Ag | Position-change switch |
-
1991
- 1991-09-16 SE SE9102662A patent/SE469048B/en not_active IP Right Cessation
-
1992
- 1992-09-07 DE DE69223903T patent/DE69223903D1/en not_active Expired - Lifetime
- 1992-09-07 EP EP19920202699 patent/EP0537812B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0537812A3 (en) | 1995-03-15 |
SE9102662L (en) | 1993-03-17 |
SE9102662D0 (en) | 1991-09-16 |
SE469048B (en) | 1993-05-03 |
DE69223903D1 (en) | 1998-02-12 |
EP0537812A2 (en) | 1993-04-21 |
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