DE2106887A1 - Sun protection for the receiving cells of an IR warning device - Google Patents

Description

Dr.-Ing. Günter P u s c h, 6901 Dilsberg, Bannholzweg 12

Sun protection

for the receiving cells of an IR warning device. Addendum to patent (note P 2031971.5)

The patent application P 20 31 971.5 extends to a method to monitor the airspace with regard to IR and laser beams and to a warning device to carry out this Procedure. The present invention relates to a sun protection for the receiving cells used in this device thus represents a further development of the warning device mentioned.

At today's high speeds of the missiles, the rays emanating from them have to come from great distances can be perceived if a warning is to serve its purpose. The light energy applied to a cell is in these cases extremely low. This can only be achieved with the help of sharp lenses and very sensitive receiver cables Collect light energy so that, when converted into electrical pulses, it is sufficient to generate control signals. Such sensitive However, cells do not long withstand the sun's rays, which are several powers of ten.

The object of the invention is to provide a device ^ which the cells on the one hand eineii ensiled protection against Sonnenainstrahlung ^ eviähTt, on the other hand, the recording very EELC / AGL:. ^ I ^ - ^ xr ^ AlSn & ■ i ie ^ * u üsr-vaeheiiä «} -: Idf not dream beeiivfc ^ äeiioig-o,

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In the case of stationary devices, this task could be solved in the following way:

- Since the sun, seen from us, describes an arc that lies in the same plane as the observation point, it is sufficient if the sun protection pane is in this plane with the same Angular velocity as the sun is moved across the image field. This can be done with a device controlled by a clock accomplish. The only thing to note is that the orbital plane of the sun's movement changes from day to day. The device in order to move the protective pane, therefore, readjustment must be carried out according to known astronomical methods.

However, this solution is ruled out if the device is on a w vehicle or an airplane, since then the control should be done by a stabilized platform, which would require a very high technical effort.

According to the invention, the objective lens group is in front of the image field a disc movable in the vertical and azimuthal directions, each with an actuator for both movements imd a pole control actuated by the sun's movement, the controls the adjusting devices of the two actuators so that the disc, regardless of the movements of other components of the warning device, which follows the movements of the sun and the cell, which is in the optical axis parallel to the sun's rays lies, respectively staked out.

* In this way it is achieved that only one cell, namely the one that is in the danger zone of the sun's rays is covered to the outside and is therefore excluded from observation, while all other cells are available for monitoring the airspace.

The combination of the movement of the sun protection pane from a vertical and an azimuthal movement requires a control device which simultaneously operates on the adjustment device for vertical adjustment and on the adjustment device iiir dl ■ ':. azimuthal adjustment acts. According to a further concept of the invention, this object is achieved in that

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the sunshade with at least four evenly over the Perimeter distributed detectors is provided, which are alternately gated with the help of a rotating shutter. On the detectors incident sun rays trigger electrical control impulses, which together form the directional vector for the Sun movement result and the sun protection screen steadily so track that the cell lying in the direction of the sun's rays is covered by the protective pane.

In the accompanying figures, two exemplary embodiments of the invention are shown somewhat schematically. Show it:

Fig.T shows a vertical section through a with the sun protection device equipped warning device with a step motor for the azimuthal movement of the protective screen;

2 shows the arrangement of the detectors on the protective pane;

3 shows a vertical section through one with the sun protection device equipped warning device with magnetic coils for the azimuthal movement of the protective screen;

4 shows a horizontal section through the drive device according to Fig. 3 for the azimuthal movement of the protective screen.

Between the objective lenses 2 and the field lenses 3 of a warning device a disk θ is arranged. The size of the disc is dimensioned so that it can be removed from its central position even in the event of minor deviations completely covers the beam coming from the objective lens.

The disc is suspended from a linkage 9 which is mounted at the upper end of a shaft 31 so that it is about a horizontal Axis 29 can be pivoted. The pivoting movement is brought about with the aid of a mounted on the arm 19 of the linkage Permanent magnets 10 and two rows of magnet coils 30. The magnet coils are in a frame firmly connected to the shaft 31 21 arranged in such a way that calibrate the permanent magnet 10 can move freely between them.

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The shaft 31 is in turn mounted in two vertical bearings 23 and 24 which are attached to arms 13 and 14. Arm 13 is with the wall 15, arm 14 firmly connected to the wall 11 of the housing. At the lower end of the shaft 31 is a stepper motor 26 arranged for pivoting the frame 21 in the azimuthal direction.

To control the rod movements, the protective disk 8 is uniform with four on its side facing the objective lenses Equipped over the circumference detectors 18 (Fig.2), two of which the pivoting movement in the vertical direction and two control the movement in azimuthal direction. In front of the disc 8, a modulation disc 28 is arranged, which is of a Motor 11 is set in rotating motion.

The field of view captured by the objective lenses represents only a small part of the sky above the horizon As long as the sun is outside this field of view, its rays are not picked up by any objective lens and therefore cannot get to the detectors. As soon as a sunbeam hits one of the detectors, it gives off electronically a control signal to the magnet coils 30 or to the stepping motor 26. This signal sets the relevant Adjustment device in action and causes a displacement of the disc in the sense that the beam in the center of the disc wanders until it no longer hits the detector. The disk is therefore automatically adjusted when the position of the sun changes and covers each cell that could be hit by the sun's rays.

The arrangement according to FIGS. 3 and 4 corresponds in its basic features to that according to FIGS. 1 and 2. Instead of the stepping motor 26 here only a second permanent magnet 20 has stepped, which is arranged together with one on a circular section Group of magnetic coils 40 takes over the azimuthal pivoting of the frame 21 in the vertical bearings 23 and 24.

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_ 5 -

The devices for the vertical and for the azimuthal pivoting of the disk 8 work completely independently of each other. The pivoting movements can be carried out one after the other or simultaneously, the direction vector results from the geometric addition of the two partial movements.

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Claims (5)

Sun protection for the receiving lines of an IR warning device Patent (application P 20 31 971.5) by means of an in front of the field of view of the objective lens group (2), Disc (8) movable in the vertical and azimuthal directions, each with an actuator (19, 31) for both movements and a sequence control operated by the movement of the sun, which controls the adjusting motors of the actuators so that the disc, regardless of the movements of other components of the warning device, follows the movements of the sun and the covers the optical axis parallel to the sun's rays. 2. Sun protection according to claim 1, characterized in that the disc (8) has at least four detectors on its front side (18), and that a rotating diaphragm (28) is arranged in front of the disk, which alternately scans the detectors, to obtain the direction vector for the control. 3. Sun protection according to Claims 1 and 2, characterized in that that the diaphragm (28) with its drive motor (38) is carried by a rod (9) which is mounted so that it can be pivoted around the center (29) of the ball both in the vertical and in the azimuthal direction. 4. Sun protection according to claims 1 to 3, characterized in that that the actuator for the vertical adjustment (19) is mounted in the actuator for the azimuthal adjustment (31) such that a simultaneous pivoting of the sun visor (8) about a horizontal and about a vertical axis is possible is. 5. Sun protection according to claims 1 to 4 »characterized in that that at least one of the adjusting devices consists of a permanent magnet (10) attached to the actuator (e.g. 19) and there is at least one row of separately switchable magnet coils (30). 209835/0053 Blank page