DE1162580B - Raster-shaped heat-sensitive radiation detector - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Boarding school Class: G 01 c

Number:
File number:
Registration date:
Display day:

German KL: 42 c - 39/15

A 39250 IXb / 42 c
17th October 1958
February 6, 1964

The invention relates to a grid-shaped heat-sensitive radiation detector in which the individual Raster cells are thermoelectric elements for the coordinate-wise location of the image of a radiant body in his field of view.

The construction of a grid-shaped radiation detector for location purposes is above all a technological one Problem. Such a radiation detector is required to have a high image resolution, the individual grid cells must be correspondingly small. Radiation detectors are already on photoelectric base with thousands of grid cells per square centimeter known. Purpose of Invention, the creation of a radiation detector with thermoelectric grid cells is also less Expansion.

In a known embodiment of a thermoelectric radiation detector, the thermoelectric Elements arranged along one edge of a thin insulating plate, the thermoactive Poles are formed by coatings on both sides of the insulating plate, which are on the opposite side The edge of the insulating panel. By stacking a variety of such insulating panels with insulating Intermediate layers result in an area grid. However, a radiation detector built in this way is not suitable for the purpose intended by the invention, since any Grid cell must have at least one connecting wire. However, there is a lack of funds to deal with one Area of a few square centimeters, the individual grid cells, the extent of which is less than can be about 50 μΐη, for connecting lines to prepare and then to connect these lines with the prepared places, for example to solder.

For this reason, the connecting wires must be incorporated in the technology of the thermocouples in a suitable manner be included. In the case of the radiation detector according to the invention, this object is achieved by that each thermoelectric element consists of two poles in the form of separate wire-shaped connections and a center pole layer which connects the active ends of the two wires to one another Material lying between the material of the two wires in the thermoelectric series of voltages and the center pole layers of the various thermoelectric elements in such a way on the grid plate are arranged so that they do not touch.

By choosing different conductor materials for at least one pole of the thermoelectric elements or by a suitable arrangement of the EIe grid-shaped more heat-sensitive
Radiation detector

Applicant:

Albiswerk Zurich A. G., Zurich (Switzerland)

Representative:

Dr. M. Owl

and Dipl.-Chem. Dr. W. J. Berg, patent attorneys,

Munich 13, Kurfürstenplatz 2

Named as inventor:

Dipl.-El.-Ing. Arno Welti, Zurich (Switzerland)

Claimed priority:

Switzerland of 7 October 1958 (No. 64 802)

ments by changing their mutual distances and / odei the surface areas of the heat-sensitive active areas can be selected to be of different sizes Resolving power can be arbitrarily influenced via such a grid, which for example the center of the grid is very fine, but the edge of the grid can be adjusted less finely. This can be, for example be important for locating moving bodies by placing the body on the edge of the grid only relatively imprecisely located and, the closer it gets to the center of the grid, the more precise in terms of coordinates is detected. In this way, a large number of thermoelectric elements can be saved without that the early detection of a moving body in the image field of the grid must be forfeited.

At the same time, the number of possibly necessary amplification channels of the thennoelectric Reduce elements according to the saved elements.

With reference to the drawing are exemplary embodiments of the grid-shaped according to the invention Radiation detector explained in more detail.

In Fig. 1 is part of a grid-shaped radiation detector shown in section. A grid plate 17 made of insulating material has two in each grid point closely adjacent holes through which the two form the poles of the thermoelectric element Wires 14, 15 are passed, of which the

409 507/128

for example one of bismuth and the other of antimony. The active ends of the two Wires 14 and 15 are connected to one another by a so-called center pole layer 16. This exists made of a material that is in the thermoelectric series between the material of the two Wires 14 and 15 lies and in the present case can be gold, for example. The center pole layers 16 of all thermoelectric elements are arranged on the grid plate 17 in such a way that they on the same preferably form circular islands that do not touch. Over all center pole layers 16 lies a certain rays transmitting, the remaining rays absorbing or reflective common filter and protective layer 18.

As already mentioned, the resolution can be arbitrarily influenced via a grid, by the mutual distances of the thermoelectric elements or the area of the active ones Surfaces of the same are formed differently according to a predetermined regularity. the FIGS. 2 to 4 show schematic exemplary embodiments of such grid-type radiation detectors, 2 and 3 show examples with unequal distances between the thermoelectric elements 19 and F i g. 4 shows an example in which the areas of the active areas 20 of the thermoelectric Elements increase from the center of the grid to the edge of the grid according to a predetermined law.

The mode of operation of the grid according to the invention is briefly described below.

The rays emitted by a body are applied to the surface by means of an optical system of the grid at the point that corresponds to the position of the body in the image field of the grid. At this part of the grid, local heating corresponding to the intensity of the radiation occurs, the thermoelectric ones located under the filter and protective layer at this point Elements generates a voltage that is used for the instantaneous coordinate determination of the above-mentioned body is used.

Claims (1)

Claim: Rasterfönniger heat-sensitive radiation detector in which the individual raster cells Thermoelectric elements are used to coordinate the location of the image of a radiating Body in its field of view, characterized in that each thermoelectric element consists of two poles in the form of separate wire-shaped Terminals (14, 15) and one connecting the active ends of the two wires to one another Center pole layer (16) from one in the thermoelectric voltage series between the Material of the two wires consists of lying material and the center pole layers of the different thermoelectric elements are arranged on the grid plate (17) that they don't touch. Considered publications:
British Patent No. 676,963. 1 sheet of drawings 409 507/128 1.64 © Bundesdruckerei Berlin