DE3002467A1 - Shell accuracy testing system for quality control - uses camera focussed on target recording proximity ignition of fired shells - Google Patents

Abstract

The target hit count verification system measures the amount by which a number of test shells selected from a mfg. batch fail to hit the target. The shells are aimed at a freely suspended target onto which a camera is focussed providing an image of the target and its immediate proximity. Each shell has a proximity fuse the camera registering the ignition of each shell as it passes the target. Pref. a video camera coupled to an image storage device is used. The camera is either triggered by the shell being fired, or it is triggered at a given interval after firing, e.g. using a microphone to provide the firing signal. The path of the shell may also be tracked by a radar device. A second camera may be focussed onto an electronic time recorder the two images from both cameras being combined.

Description

description

Test device for the teff error around which a projectile the respective Target missed. The invention relates to a test device according to the Preamble of claim 1.

When testing and drawing lots of proximity fuses, which are the target To have a freely suspended body, it is necessary to determine the exact distance between Knowing projectile and target if the proximity fuse, which has a limited sensitivity did not explode at the target. It is then to prove that the hit error larger than the prescribed maximum hit error wdr Btzi der Inaccuracy of the cannon used can be this: Often the case Used one has two television recording systems, one of which is to the side, d. h 900 to Firing path, and one is aimed in the firing path of the projectile, then you get because of the high projectile speed and the slow sequence of images (25 imagesXsekO) the television recording system from the side system no television images of the Projectile unless the projectile explodes at the target.

The invention is based on the object of a generic testing device specify the exact minimum flight distance of the projectile past its Makes the target object reliably accessible for a subsequent review, if the projectile does not explode at or near the target object. The solution to this The task can be found in claim 1.

The subclaims relate to advantageous embodiments the invention.

The invention is based on the essential knowledge that the recording system, which is aligned in the firing direction of the projectile, can accommodate the projectile, because the projectile only makes small relative movements in this direction will then be able to determine the television picture which is closest to the destination the hit error can be determined the projectile in the direction of flight - preferably from behind - filmed and expediently a timer is started at the same time as the launch, its time display introduced into the picture will. Basically, this is a movie recording also possible from the opposite direction, d. H. with a receiving device, which is located behind the target object as seen from the launch site of the projectile and picks up the target object and the projectile against its direction of flight. These However, the latter embodiment of the invention is generally opposite there are no advantages to filming in the direction of flight.

The launch of the projectile can be easily detected by a sound sensor, which is placed on the gun, for example on its mount. Appropriate is, a radar tracking device for determining the flight time of the projectile provide from the cannon to the target; however, this flight time can also be done with help can be determined approximately from a shot table.

The illustration now shows an exemplary embodiment that has proven itself in practice the invention described in more detail.

The shock wave or the muzzle flash of a cannon start when it is fired of the projectile the electronic time counter by the comparator KOMP. 1. With acoustic Determination, the microphone is placed on the cannon rack so that there is no time delay entry. A television camera 1, which follows the trajectory, is so far in the direction of the target placed in front of the cannon, so that the withdrawing smoke and the pressure wave die Do not affect image quality. A television camera 2 films an electronic one Time counter. The two television images are mixed via a mixer in such a way that the time counter can be seen in a corner of the television picture. The mixed picture is stored on a recording device. If there is an ignition, gives the optical sensor emits an electrical impulse and a comparator KOMP 2 stops the electronic time counter.

After the shot, the mixed television picture can be recorded by the recording device be reproduced. From the picture in which the detonation flash can be seen for the first time If there is a picture in front of it, the radial distance between the floor and the target can be determined. A picture in front of it is important because the detonation flash is not always even spreads.

If there is no ignition, a radar tracking device can be used or the projectile flight time cannon - target can be determined from known shots. Based on this time, the television picture can be found which corresponds to the destination next is. The radial distance between storey and Target to be measured L e r s e i t e

Claims (9)

Claims 9 testing device for the hit error to which a projectile misses the target, especially for use in trial shooting a predetermined number of test items from a specific production series, for example when trial firing projectiles with proximity fuses predetermined limited Responsiveness to a test target freely suspended in the room, characterized in that one in or opposite to the direction of flight of the projectile the target object and its immediate spatial environment oriented towards the target object Cinematographic recording at least up to a predetermined spatial radius of the surroundings Bildaufnahs meeinrichtung for the target object and the approaching the target object and possibly passing floor is provided0 2. Test facility according to claim 1, characterized in that the image recording device is a photographic one Film recording device or - preferably - a television recording device, consisting of a television camera and an image storage device. 3. Test device according to claim 1 or 2, characterized in that that the image recording device at the time the projectile is fired or after it has expired one according to its expected flight duration until shortly before the target object preselected period of time is started. 4. Test device according to one of claims 1 to 3, characterized in that that a timer is started at the time of launch of the projectile, its time display into the image recording, e.g. B. in the television picture - preferably in one of the corners of the picture - is displayed. 5. Testing device according to claim 4, characterized in that the Time resolution of the timer and its display is chosen so that as possible each frame contains a separate time display. 6. Test device according to claim 4 or 5, characterized in that that to determine the launch time an acoustic or an optical sensor is provided. 7. Testing device according to claim 6 with an acoustic sensor, characterized characterized in that the same is attached directly to the gun mount or is placed on the same. 8. Test device according to one of claims 1 to 7, characterized in that that for the determination of the time at which the projectile on or near the Target object explodes, a - to the optical sensor for the time of launch, if necessary additional - optical sensor is provided. 9. Testing device according to one of claims 1 to 8, characterized in that that a path tracking radar device for the projectile and its trajectory to the target object is provided.