SU692339A1 - Coordinate-sensitive piroelectric radiation source receiver - Google Patents

Description

(54) COURSE-SENSITIVE RADIATION RECEIVER PYROELECTRIC

I

The image relates to the field of rhythmic pyrometry and can be corrected in the following control systems, orientation and guidance for determining & nor the coordinates of electromagnetic radiation fluxes, such as laser, in a wider spectral range from the visible to the infrared region of the spectrum.

Positional-sensitive T-ray Radiation receivers are known; O containing plate: made of pyroactive material, on the irradiated and reverse sides of which there are counter electrodes. When the plate is heated locally by radiation in the pyroactive core, partial erosion occurs.

There are electric dipoles, as a result of which an electric potential difference arises between the electrodes {s) located opposite to the sides of the mud. The voltage is proportional to the irradiated area of the electrode &}.

It has linear coordinate sensitivity in a wide spectral range; These receivers do not measure non-stationary power. , the radiation flux simultaneously with the determination of the coordinates of its energy center, since the output signal depends not only on the size of the irradiated area of the electrode, but also on the change in the intensity of the radiation incident on the plate.

A pyroelectric coordinate-sensitive radiation detector is also known, which contains a flat sensing element made of uniformly polarized pyroactive material, on whose irradiated surface a continuous conductive coating is applied, and four sector electrodes extruded in the form of continuous surface coatings are applied to surfaces that are reverse irradiated. the surface of the plate formed by the intersection of the axes of coordinates. The receiver has a signal processing circuit.

692339

Including the units for determining the coordinate nat X and V to which oppositely located electrodes 2} are connected in pairs.

Register the radiation flux on the receiving plate, causing it and the local orientation of part of the electric dipoles of the pyroactive material. This leads to the appearance of electrical charges and,

Correspondingly, the potential difference between the sectoral electrodes and the irradiation (by the coating. The signals from the. electrode come into the processing circuit.

At the same time, the difference between the signals from the diametrically opposite sector electrodes corresponds to the distance between the energy center of the radiation flux and g) to the megalic center of the receiving plate (or, equivalently, one of the two coordinates X and Y of the energy center, radiation flux).

This device is used for alignment, for example laser radiation. However, the exact alignment is not high enough, since radiation is required to move precisely to the coordinate center in order to carry out this operation. But the coordinate sensitivity of the receiver near zero is insufficient, which reduces the accuracy of beam guidance. In addition, in the case when the beam diameter is less than half the diameter of the receiving element, if the beam hits it in the zone of one sector electrode, the beam does not go beyond the sector's boundaries, as a result of which there is an ambiguity of reference when finding its coordinates, difficulty in determining them.

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The purpose of the invention is to improve the accuracy of reference coordinates.

This is achieved by the fact that in the coordinate-sensitive radiation receiver the sensitive element is made in the form of a truncated body of rotation, and symmetric electrodes are deposited on its inclined boxed surface.

Due to the fact that a small base. the sensor element has no coating, around the axis of rotation of the image; there is a zone with a small base diameter, in which the receiver of a weather receiver is based on the blurring of the thermal image at the metal-ferroelectric boundary and the co-ordinate sensitivity in this area with a factor of 10 than in bector zones. Since the axis of rotation of the tep is projected to a null point of the flat coordinate system on the irradiated surface, due to the high coordinate sensitivity in the central zone, the accuracy of the coordinates near zero is significantly increased, which is extremely important, since, for example, the radiation of the radiation source is zeroed .

In this case, due to the inclination of the lateral surface of the body of rotation, the sensitive element has a variable thickness increasing from the periphery to the central zone, resulting in a shift of the beam, even if the egr diameter is sufficiently small (less than half the diameter of the sensitive element), is unambiguous. The signaling j that allows the beam to be brought to the center of the element, i.e. to the most coordinated: u-sensitive area ..

The implementation of the sensing element in the form of a hyperboloid of rotation ensures the linearization of the coordinate characteristic throughout the entire field of irradiation of the element.

The drawing shows a coordinate-sensitive pyroelectric Radiation receiver containing a sensitive element 1 of polarized pyroactive material, made in the form of a truncated body of rotation having larger and smaller flat bases. The body of rotation is a truncated hyperboloid of rotation, the cross sections of which are expressed by the dependence

.. 2H (I. where 5. is the thickness coordinate of a truncated hyperboloid}

the cohesive coordinate is on the diameter of the larger base of the truncated: rotation hyperboloid, counts / dl

| GK | | .

| -.

one.

2

100 in 5d.

20

where is the diameter of the small base of the truncated hyperboloid of rotation equal to the diameter of the beam under study. On the larger base 2 of the sensitive element a continuous conductive coating 3 was applied, on which g was applied; 4 layer of mobile. On the inclined surface of the sensitive element four symmetric electrodes 5 are applied in the form

Claims (1)

Claim A coordinate-sensitive pyroelectric radiation detector containing a sensing element with an absorbing AND four symmetric electrodes, and a signal processing circuit, with the aim that, in order to increase the accuracy of the coordinate reading, a sensing element made in the form of a truncated body of revolution, and symmetrical electrodes are deposited on its inclined side surface.