The moving target simulator

 

The moving target simulator is made in the form of collimator contains a lens, the test object is illuminated hub of the backlight and is located in the center of the picture plane that is coincident with the focal plane of the lens, and the fixed and movable mirrors. Movable mirror fixed in a gimbaled two mutually perpendicular axes so that the plane of the axes of the gimbal coincides with the surface of the moving mirror, and the sighting axis passes through the point of intersection of the axes of gimbal. The size of the picture plane, the image of which is formed in the field of view scanned product, twice the size of the linear field of view lens. Technical result: the exception of a reversal image of the test object, visible to the eye, without compromising image quality. 5 Il.

The invention relates to opto-electronic devices, particularly to devices produce an image of a moving target, made as a collimator, and can be used when checking the performance of devices in accordance with the specified parameters.

Closest to the claimed invention, the essential features is "Astro. 09. 95,, publ. 27.08.99 year) selected for the prototype and represents a collimator lens in the focal plane of which is stationary test object, two reflective mirrors, one of which is movable and has a rotation around the axis perpendicular to the sighting axis, a compound prism, in this case the prism of Pehan, which has the ability to turn around the sighting axis, and site illumination of the test object. Two movable optical element: moveable mirror and a prism of Pehan allow the image of the test object to move across the field of view of the collimator, and during rotation of the mirror the image is shifted in the radial direction, while turning the prism of Pehan - in a circle, and the reversal of the image is double the angle of rotation of the prism, for example, the reversal prism of Pehan 180oprovides movement of the image circle 360orelative to the center of the field of view.

The main disadvantage of the prototype is the presence of circular reversal image of the test object, due to the use of prisms of Pehan that creates discomfort during the test.

The task to be solved by the invention consists in the exclusion of a reversal image of the test object, salsa collimator, consisting of a lens, in the center of the focal plane of which is a test object, illuminated site of the backlight, and the lens is placed movable and fixed mirrors.

Distinctive features of the claimed invention from the prototype are the following.

In the immediate vicinity of the lens is movable mirror, which is enshrined in the gimbal suspension, consisting of two frames, with the axis of the pumping in two mutually perpendicular planes coincident with the surface of the mirror, and the sighting axis passes through the point of intersection of the axes of pumping and perpendicular to the mirror surface, and the radius of the oscillating mirror is selected the maximum of the conditions valid asphericity of the picture plane, and the light area of the picture plane simulator doubled compared with the linear field of view lens.

Due to the presence of these symptoms improve conditions and quality control.

The essence of the invention illustrated by the drawings, is shown in Fig.1-5.

Fig.1 - schematic diagram of the simulator of a moving target.

Fig.2 is a view of picture plane during pumping mirrors.

Fig.3 - scheme of fixing the moving mirror in the propeller p is th plane.

Fig. 5 - layout simulator when testing the products at a moving target.

The moving target simulator, made in the form of collimator has a single housing 1 (Fig.1) in which the lens 2, the movable mirror 3, the fixed mirror 4, a translucent plate 5, in the centre of which is a test object 6 with figure, illuminated by the light bulb 7. The plate 5 from the figure, the test object 6 is formed of the picture plane 8, which is centered with respect to the sighting beam 9 is formed in the image field of view (Fig.2), a limited Central area 10.

Movable mirror 3 is fixed to the gimbal suspension, consisting of two frames having two mutually perpendicular to the axis of the pump 11 and 12 (Fig.3) located in a plane coincident with the surface of the moving mirror 3, the resulting field of view, limited areas 13 and 14 (Fig. 2). The moving target simulator and check the products 15 are arranged on the same axis.

Working with a moving target simulator is as follows.

For the lens 2 in the direction of the sighting beam 9 have audited the product 15 (Fig. 5). As close as possible to the lens 2 set the movable mirror 3, with the point of the swing (Fig.1) that positions the specified field on the edge of the field of view does not coincide with the picture plane 8 by the value of t, this leads to a defocusing of the image. The magnitude of the swing radius R is chosen maximum, according to the aberration calculations. For example, in the simulator, when the focal length fI=420 mm, the radius of the swing R=325 mm, with t=0.08 mm, which corresponds to the desired image quality on the edge of the picture plane 8.

A movable mirror 3 to form the picture plane 8 simulator having a size twice as large Central zone 10, which is a necessary and sufficient condition for obtaining high-quality images (Fig.1). In the direction of the sighting beam 9 depending on the position of the moving mirror 3 to form a bundle of rays emerging from the Central zone 10 (Fig.2), as well as from the areas 13 and 14. Therefore, in the field of view scanned articles see different areas of the picture plane, but in every area of the test object 6 remains the same, only its position in the field of view of the simulator is different.

So, for the initial position of the sighting beam in the scanned product will be formed image area 10, and at its center is the test object 6.

When the swing of the moving mirror around the axis of the pump 11 (Fig.3) on the corner/2 (Fig. 1) the sighting beam is deflected by the angle

When the swing of the movable mirror 3 around the axis of the pump 12 (Fig.3) the sighting beam gets to the point OII(Fig.2) and in the field of view scanned items will be similar to form an image of the test object 6 in the zone 14, i.e. in the field of view scanned product image of test object 6 will be on the left.

Thus, when the swing of the movable mirror 3, the image of the test object 6 moves in a circle on the 90o. However, when the swing of the movable mirror 3 around the axis of the pump 12 is a minor reversal image of the test object 6 on the angle of leveling.

In the proposed simulator swing anglenot more than 4othat eye practically do not differ. Therefore, it can be noted that when the circular movement of the image across the field of view scanned products in the small, not visible, corner levelingrotate image of the test object 6 does not occur.

Control of rotation of the mirror can be carried out manually or using torque sensors mounted on the axes of the gimbal and connected electrically to the control unit.

 

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FIELD: IR-imaging.

SUBSTANCE: IR imager has objective, rotating multifaced prism, image transfer device and linear photo-receiving array. Objective has frontal meniscus turned with its convexity to object and afocal meniscus turned with its convexity to image and disposed close to plane of objective intermediate image. Entrance pupil of objective is disposed at front focal plane of frontal meniscus. Prism has skewed faces. Thickness of the prism along optical axis is thinner for smaller angles of skew than for larger angles. Axis of rotation of prism is disposed behind the plane of real intermediate image of objective. Device for transferring image has collimating and focusing components. Radiuses of curvature of frontal R1, R2 and afocal R3, R4 meniscuses along beam path are equal to: R1=(0,9-1,1)f'l, R2<1.5 f'l,R3=(0,95-1,05).((n-1)d3)/(1-β0)n), R4=β0 R3, where f'l is focal length of frontal meniscus, n is refraction factor of material of meniscuses, d3 is longitudinal thickness of afocal meniscus, β0 is linear magnification of afocal meniscus.

EFFECT: improved quality of image; simplified scan drive; improved frequency of frame scan.

4 cl, 12 dwg

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