DE102006028598A1 - Sensor arrangement for sensing an approximation on an object and/or for sensing a fly-by on the object from ferromagnetic material, comprises two sensor coils axially extending with one another and turned together in row - Google Patents

Abstract

The sensor arrangement (12) for sensing an approximation on an object and/or for sensing a fly-by on the object from ferromagnetic material, comprises two sensor coils axially extending with one another and turned together in row. The winding sense (14, 16) of the sensor coils (S1, S2) is opposite to the winding sense of another sensor coils. The sensor coils possess same coil parameters and same number of turns.

Description

The The invention relates to a sensor device according to the preamble of the claim 1.

at known levels are the sensor devices, for example as radar proximity sensors or as optronic proximity sensors educated. Such sensors are complex and therefore in their Purchase expensive.

Of the Invention is based on the object, a sensor device of to create the aforementioned type, the comparatively simple educated and reasonably priced is feasible.

These Task is with a sensor device with the features of the claim 1 solved. preferred Training or further developments of the sensor device according to the invention are in the subclaims 2 and 3 marked. A preferred use according to the invention the sensor device according to the invention is claimed in claim 4.

The Sensor device according to the invention for a projectile has two mutually axially spaced sensor coils, wherein the winding sense of a sensor coil to the winding sense of the other Sensor coil is opposite, and where the two sensor coils have the same coil parameters. The two opposite wound sensor coils form an inductive sensor device, the in that the two sensor coils have the same coil parameters own, interference-compensated is. The coil parameters are the coil cross-section, the coil length and the number of turns after the voltage induced in a coil to the inductance the coil is proportional and the coil inductance squared the number of turns and the coil cross section directly and vice versa to the coil length is proportional. Own according to the invention So the two sensor coils preferably the same number of turns. The two sensor coils are preferably connected in series with each other, to the corresponding circumstances, the resulting Voltage from the induced voltages of the two sensor coils to record and evaluate. The sensor device according to the invention can in advantageously, e.g. as encounter sensor of a blast grenade against missiles be used.

Further Details, features and advantages will be apparent from the following Description of an embodiment schematically illustrated in the drawing a projectile with a sensor device according to the invention.

It demonstrate:

1 a projectile with a sensor device in a side view,

2 one of the 1 similar view of a projectile with a sensor device in a disturbing field,

3 one of the 2 similar illustration to illustrate a projectile with a sensor device, the projectile in a field performs a pendulum motion,

4 a projectile with a sensor device in an approach to a target to be controlled, and

5 a projectile with a sensor device in a flyby at a target.

1 illustrates schematically, not to scale in a side view of a projectile 10 that is a sensor device 12 which is provided for detecting an approach to a target or for detecting a flyby of a target made of ferromagnetic material. The sensor device 12 has two mutually axially spaced sensor coils S1 and S2. The winding sense of the sensor coil S1 is through the arcuate arrow 14 clarified. The winding sense of the sensor coil S2 is through the arcuate arrow 16 clarified. The winding sense 14 is counterclockwise and the winding sense 16 is oriented clockwise, ie the winding sense of a sensor coil is opposite to the winding sense of the other sensor coil.

A optimal interference compensation the inductively effective sensor coils S1 and S2 can then be ensured if the two sensor coils S1 and S2 have the same coil parameters, i.e. the same inductances own, because the voltage induced in a coil to the inductance of the respective coil is directly proportional. The two sensor coils S1 and S2 have So preferably the same coil cross-section, the same coil length and the same number of turns.

In the case of a magnetic field change, an output voltage U1 is induced in the sensor coil S1 and an output voltage U2 is induced in the sensor coil S2. The two sensor coils S1 and S2 are connected to each other in series, so that there is a resultant voltage U _R at the output of the sensor device. This resulting output voltage U _{R of} the sensor device 12 is the vectorial sum of the voltages U ₁ and U ₂ .

2 illustrates the projectile 10 with the sensor device 12 according to 1 in an interference field indicated by oblique thin lines 18 as it does for example by power lines or by remote metal objects. This interference field 18 is detected by the two sensor coils S1 and S2 simultaneously and with the same amount U ₁ and U ₂ . Due to the opposite winding sense 14 and 16 For example, in the sensor coil S1, the sensor coils S1 and S2 generate a positive voltage U ₁ dependent on the time t and an equally large negative voltage U _{2 is} generated by the sensor coil S2 wound in the opposite winding slot. As a result of the series connection of the two sensor coils S1 and S2, the resulting voltage U _R = 0.

3 illustrates the projectile 10 with the sensor device 12 in a field 18 , where the bullet 10 one through the arcuate double arrow 20 implied pendulum movement executes. By such a pendulum motion of the projectile 10 For example, a sinusoidal voltage U ₁ is generated in the sensor coil S1, and a sinusoidal voltage U ₂ phase-shifted by 180 ° is generated in the oppositely wound sensor coil S2. After the voltages U ₁ and U _{2 are the} same size but phase-shifted by 180 °, the resulting voltage U _R = 0.

From the above remarks to the 2 and 3 it follows that by the sensor device according to the invention 12 with the two oppositely wound sensor tracks S1 and S2, which have the same coil parameters, a disturbance compensation is achieved in a simple manner.

4 illustrates the projectile 10 with the sensor device 12 when approaching a target to be attacked 22 , The sensor coil S1 points from the target 22 a smaller distance than the sensor coil S2, so that in the sensor coil S1, a voltage U _{1 is} induced, which is greater than that due to the opposite Wickelsinnes 16 opposite polarized voltage U ₂ , so that as a result of the series connection of the two sensor coils S1 and S2, a resultant voltage U _R ≠ 0 results. As can be seen from the U (t) diagram of the 4 , the increase of the resulting voltage U _R , ie the time differential of the resulting voltage dUR / dt can be evaluated as a threshold, in the U (t) diagram by the dot-dash line 24 is indicated.

5 illustrates a projectile 10 with a sensor device 12 while passing a target 26 , Here is the goal 26 at A in front of the projectile, in position D laterally across from the projectile and in position C behind the projectile. In position A, the sensor coil S1 is the target 26 closer than the sensor coil S2, so that in the sensor coil S1, a voltage U ₁ and in the sensor coil S2, a voltage U _{2 of} opposite polarity is generated, wherein U ₁ due to the shorter distance to the target 26 is greater than the voltage U ₂ . The resulting voltage is indicated in this position A in the U (t) diagram with U _{R, A.} In the transverse position B, a voltage U _{1 is} induced in the sensor coil S1 and a voltage U _{2 is} induced in the sensor coil S2, which are oppositely polarized, but of equal magnitude, so that the resulting voltage U _{R, B} = 0.

In the position C which applies to position A applies vice versa, that is induced in the sensor coil S1 voltage U ₁ is smaller than that in the sensor coil S ₂ induced voltage U _2, so that a resulting voltage U _{R, C} with the polarity the voltage U _{R, A} opposite polarity results.

The time course of the resulting voltage U _{R of} the sensor device 10 can be used interference-compensated so, the particular scenario of the projectile 10 comparatively easy to determine with simple means.

Essential to the invention is the difference between the two voltages in the coils S1, S2, the opposite sense of winding 14 have to be measured. For this there are known techniques, in addition to the series connection specified here you can also z. B. tapped via a Wheatstone half bridge the differential voltage.

10

bullet

12

sensor device (S1 and S2 for Bullet)

14

winding direction (from S1)

16

winding direction (from S2)

18

Field (at 10 )

20

Pendulum movement (from 10 )

22

Target (for 10 )

24

Voltage threshold (from 12 )

26

Target (for 10 )

Claims (4)

A missile sensor device, which is provided for detecting an approach to a target and / or for detecting a flyby on a target of ferromagnetic material, characterized in that the sensor device ( 12 ) has two mutually axially spaced sensor coils (S1 and S2), wherein the winding sense ( 14 ) of a sensor coil (S1) to the winding sense ( 16 ) of the other sensor coil (S2) is opposite and the two sensor coils (S1 and S2) have the same coil parameters. Sensor device according to claim 1, characterized that the two sensor coils (S1 and S2) have the same number of turns have. Sensor device according to claim 1 or 2, characterized characterized in that the two sensor coils (S1 and S2) with each other are connected in series. Use of the sensor device ( 12 ) according to one of claims 1 to 3 as an encounter sensor in a blowing effector ( 10 ) against enemy missiles ( 26 ) or in a steerable missile against other missiles.