SU1200798A1 - Multielement coordinate silicon photodetector - Google Patents

Description

The invention relates to the field of coordinate-sensitive photodetectors used in orientation devices of spacecraft and scientific instruments on astorioetiry and other radiation sources, as well as in collimation devices of light, laser centering systems (LISC) as target-sensitive target marks. (PMPC).

The aim of the invention is to improve the accuracy and increase the field of view of a photodetector by creating a coordinate-sensitive photodetector having a large light-sensitive surface providing a large field of view up to 2 sr for detecting a landmark.

and then pointing it to the center of the built-in small photodetector with high accuracy.

FIG. 1 shows an 8-element “square square coordinate-sensitive photodetector, FIG. 2--8-element square coordinate-sensitive photodetector (section AA).

I

The photodetector contains light-sensitive sites 1 of a larger dia & meters, light-sensitive pads 2 of smaller diameter, mutually perpendicular gaps 3, annular gap k, silicon substrate 5, contacts 6 to the photosensitive layers, contact 7 to the silicon pollock.

On the photosensitive sites 1 and 2, contacts 6 are applied, to which current-collecting conductors welded to the legs of the socol are welded. Conductors extending from four small inner sector pads 2 are laid in radial gaps 3 between the circumferential peripheral pads. This is necessary in order not to obscure the photosensitive ring pads and not to create false changes (drops) in the photoelectrically signals when the conductors intersect with a light spot — an image of a small landmark;

In the center of the photosensitive area of a large size (diameter) 10-60 mm, determined by the necessary maximum field of view, a photo1 electrically isolated area of 1-3 mm, defined by the size of the source image, is highlighted on the photosensitive surface. on the photosensitive surface.

Based on the size of industrial samples of photodetectors (d 2 mm and mm), the minimum ratio

§ "5. Manufactured experiment;

The sample has a diameter of 2.8 mm and a diameter of 20 mm. The most technically feasible ratio is determined by the diameter of the silicon ingots / etrom, which is currently in mm.

The device works as follows.

The light beam from the landmark, formed by the optical system, in

the process of finding a landmark first falls on one of. photosensitive sites 1,

Having found a landmark in a large field of view, the orientation system operating in the relay mode guides the landmark of a small square photosensitive site 2 |

When an image of the reference point hits (transition) on one of the elements of the small photosensitive platform 2, the orientation system switches from the external ring-sensitive photo areas 1 to the internal platforms 2 and continues pointing the center of the quadrant to the image of the landmark.

Homing the center over the image of the landmark is accompanied by a gradual exposure of two, three, and then all four quadrant sites. Maintaining the toning of the center of the quadrant on the landmark is carried out by equality of the magnitudes of the photoelectric signals from each of the four small sites. I

The deviation of the signal values from equal values determines the accuracy. These deviations in the proposed device have the minimum possible values, since large areas are photoelectrically isolated from small areas of the quadrant.

The ratio of the sizes of the large and small areas is determined depending on the specific astrophysical and astronavigation situation in the process of selecting optics and forming an algorithm for pointing the center of the quadrant on the astro-orientation.

Claims (1)

30 equal values determines accuracy. These deviations in the proposed device have the minimum possible values, since large areas are photoelectrically isolated from small areas of the quadrant. The ratio of the sizes of the large and small areas is determined depending on the specific astrophysical and astronautical situation during the selection of optics and the formation of an algorithm for pointing the center of the quadrant to an astronomical reference point. 1200798 Figure 2