Calibration device for performing a non-uniformity adjustment of an infrared detector in a seeker head of a guided missile

Abstract

Adjustment device (1) for performing a non-uniformity correction of an infrared detector (102) in a seeker head (100) of a guided missile, comprising: a radiation body (10); a heating device (20) thermally coupled to the radiation body (10) for setting a predetermined adjustment temperature of the radiation body (10), wherein the heating device (20) comprises a carrier film (21) and an electrical resistance heating wire (22) which runs on the carrier film (21) in a heating wire pattern (M22); and a holding device (40) to which the carrier film (21) is attached; wherein the holding device (40) comprises a support part (41) which defines a recess (42) that at least partially encloses the radiation body (10), and wherein an air gap (43) is formed between the radiation body (10) and the support part (41).

Description

The present invention relates to a matching apparatus for performing non-uniformity matching of an infrared detector in a seeker head of a guided missile.Seeker heads of guided missile are usually equipped with thermal image viewing devices. These thermal image viewing devices can be realized, for example, as infrared detectors, IR detectors for short. Such IR detectors are often used as array arrays of a plurality of IR sensitive pixels and are configured to detect infrared (IR) radiation emitted from an object. For this purpose, IR detectors have a substrate which is coated with an IR-absorbing layer in a multiplicity of discrete regions. These regions form the pixels, which each at least partially absorb the radiation emitted by the object. This absorption can be detected, for example, as an electrical voltage.Within a pixel array of an IR detector, the individual pixels generally have absorption properties that differ slightly from one another. This results in mutually deviating detection results in the case of uniform, constant irradiation of the detectors. In the production of IR detectors, therefore, usually a non-uniformity correction is carried out, which is referred to as "non-uniformity correction", NUC for short. In this case, the array receives radiation emitted by a homogeneously emitting surface with known temperature and with known radiation properties, and the radiation values detected by the individual IR detectors are calibrated to the reference values predefined by the homogeneously emitting surface.During the storage of IR detectors, a change in the absorption properties of the substrate material can occur, for example as a result of aging. In order to be able to operate reliably precisely, it is therefore necessary in the case of seeker heads of guided missile to carry out a NUC again before use. US 2008 / 0210872 A1 describes a seeker head in which this NUC is carried out with the aid of a diaphragm which is inserted into the field of view of the IR detector. This shades off the IR radiation incident from the outside and the aperture provides a uniformly emitting surface for the passage of the NUC.US 2013 / 0 043 390 A1 describes a calibration system for a detector having a base element, a plurality of radiation sources fixedly attached to the base element and a positioning mechanism attached to the base element.U.S. Pat. No. 8 872 111 B2 describes an infrared spectral modulator for scene-based correction of image irregularities.US 2016 / 0 238 454 A1 describes a system for calibrating an imaging system with a shutter that is movable into the beam path of the imaging system in order to generate an image of the shutter surface.U.S. Pat. No. 7,795,564 B2 describes an optical system which comprises an optical unit and first sensor unit for detecting electromagnetic radiation and a micromirror matrix unit which is arranged in the beam path between the first optical unit and the first sensor unit.The document DE 600 23 099 T2 describes an electro-optical system with a turret head and an external thermal reference source.US 5 129 595 A describes a target detection and tracking system suitable for use on non-rotating ballistic ammunition projectiles.US 4 615 496 A describes an infrared seeker which processes both image data and non-image data available around a potential target area.The publication DE 42 41 617 A1 describes a black body radiator with a body with temperature sensors that can be heated by means of a heating device and with a radiating surface.It is an object of the present invention to provide a concept for performing nonuniformity correction of an infrared detector which provides results with improved accuracy.This object is achieved by a matching device for performing non-uniformity matching of an infrared detector in a seeker head of a guided missile having the features of independent claim 1.Advantageous embodiments and refinements emerge from the dependent claims which refer back to the independent claims in conjunction with the description.According to one aspect of the invention, there is provided a matching device for performing nonuniformity correction of an infrared detector in a seeker head of a guided missile. The adjusting device has a radiation body, a heating device which is coupled to the radiation body in a thermally conductive manner for setting a predetermined adjusting temperature of the radiation body, wherein the heating device has a carrier film and an electrical resistance heating wire which runs on the carrier film in a heating wire pattern, and a holding device to which the carrier film is fastened, wherein the holding device has a carrier part which defines a recess which at least partially surrounds the radiation body, and wherein an air gap is formed between the radiation body and the carrier part.The calibration device according to the invention provides a reference surface with the radiation body for emitting infrared radiation, IR radiation for short. The radiation body can be heated by means of the heating device. That is to say that a specific temperature can be set on the radiation body by means of the heating device, for example a temperature between 0 degrees Celsius and 60 degrees Celsius. This offers the advantage that even at very low ambient temperatures, which can occur, for example, when using a guided missile on an aircraft, an nonuniformity correction of an infrared detector, IR detector for short, of the guided missile can be carried out with high accuracy. By heating the radiation body, the radiation power emitted by the body is increased in the IR range. As a result, compared to nonuniformity correction performed at low temperatures without heating, greater radiation power is detected by the individual pixels, and measurement inaccuracies or signal noise will have a less effect on the accuracy of nonuniformity correction.The non-uniformity correction of infrared detectors is also referred to as "non-uniformity correction", NUC for short, as already explained above. These terms are therefore also used below.According to the invention, it is provided that the heating device has a carrier film and an electrical resistance heating wire which runs on the carrier film in a heating wire pattern. The resistance heating wire can be integrated, for example, into the cross section of the carrier film or arranged on a surface of the carrier film, in particular printed on this surface. The heating wire pattern can in particular have a serpentine course. However, it is also conceivable for the heating wire pattern to have a spiral, zigzag-shaped or comparable course. This has the advantage that a large length of the heating wire per area can be arranged, whereby the heating power per area is increased. At the same time, the heat output is distributed over the surface in a homogeneous manner. The carrier film can be realized, for example, as a kapton film.According to a further embodiment, the radiation body can have a planar shape. The radiation body can be designed in particular as a thin plate-shaped or disk-shaped component. In this case, the radiation body can also have a curvature in one or more directions, that is to say can be designed in the form of a shell, for example. The planar configuration brings about an improved planar distribution of the heat output by the heating device. In particular, a temperature gradient across the surface of the radiation body is reduced.In particular, it can be provided that the radiation body is designed as a curved shell with a circular circumference. This configuration improves a geometric adaptation of the radiation body to a dome-like structure or a dome structure of a seeker head. The calibration device can thereby be integrated into the seeker head in an even space-saving manner.According to a further embodiment, the radiation body can have, for example, a thickness in a range between 0.1 mm and 4 mm, in particular between 0.5 mm and 1.5 mm, and a diameter in a range between 4 mm and 250 mm. In this range, a particularly good distribution of the heat output is achieved. In particular, temperature gradients can be reduced in this way, for example up to 0.2 Kelvin.According to a further embodiment of the adjustment device, the radiation body can be realized as an aluminum body, wherein preferably at least a first surface of the radiation body is coated with a black, in particular IR black, cover layer. The first surface of the radiation body thus forms the reference surface for the passage of the NUC. The first surface can thus also be referred to as the emission surface. The black coating layer has a high emissivity in the infrared region, so that a near ideal black body is provided with respect to the radiation. Aluminum, which is also understood herein as aluminum alloys, has a very high thermal conductivity. This reduces the time required for heating the radiation body and achieves a homogeneous heat distribution. In this way, high measurement accuracy is achieved in the NUC.According to a further embodiment, it can be provided that the radiation body lies flat against a contact surface of the heating device. In this case, a contact surface of the radiation body is in contact with a contact surface of the heating device. The contact surface of the heating device can be formed, for example, by a surface region of the carrier film. The contact surface of the radiation body is situated opposite to the emission surface of the radiation body or oriented opposite thereto. The radiation body can be glued in particular to the heating device. Due to the planar contact, heat losses in the heat transfer between heating device and radiation body are reduced. The planar contact also promotes a homogeneous heat distribution over the radiation body. Furthermore, the improved thermal conduction advantageously reduces the heating time of the radiation body.According to a further embodiment, the calibration device additionally has an optional temperature sensor for detecting a temperature of the heating device. The temperature sensor can be implemented in particular as a temperature-dependent electrical resistor, for example as a PT-1000 element, which is thermally coupled to the heating device. For example, the temperature sensor can be attached to a surface of the carrier film. By means of the temperature sensor, an actual temperature of the heating device or of the radiation body can be detected, which can optionally be used as a controlled variable for controlling the heating power or the adjustment temperature. The temperature detected by means of the temperature sensor can also be used to determine whether heating of the radiation body is actually necessary or whether the radiation body already has a matching temperature suitable for carrying out a NUC. By arranging the temperature sensor on the heating device instead of on the radiation body, the temperature of the radiation body itself can be advantageously approximately determined. In addition, the arrangement on the heating device prevents the radiation characteristic of the radiation body from being influenced by the temperature sensor.According to the invention, the adjusting device additionally has a holding device, to which the carrier film is fastened. The holding device thus serves for the mechanically rigid mounting of the carrier film. The holding device thus facilitates the mounting of the adjustment device within a seeker head, in particular, this facilitates mounting as a movable part.According to the invention, it is provided that the holding device has a carrier part which defines a recess at least partially enclosing the radiation body, and wherein an air gap is formed between the radiation body and the carrier part. The holding device accordingly has a plate- or shell-shaped carrier part which defines a recess or in which a recess is formed. The recess can be designed in particular as a recess open on one side, i.e. it has a circumference interrupted over a partial region. Thus, optionally a frame open on one side is formed, which is, for example, fork-shaped. The carrier film is fastened to the carrier part and the radiation body is arranged within this recess, wherein the recess has an inner diameter which is greater than the outer diameter of the radiation body. As a result, an air gap is formed between the carrier part and the radiation body. In this way, thermal insulation is realized between the carrier part and the radiation body. In particular, a heat transfer to the carrier part is reduced. This advantageously reduces the temperature gradient within the radiation body.Not according to the invention, a seeker head for a guided missile can be provided. The seeker head has a dome with a radiation passage opening. The dome defines in particular an interior space. The dome has a radiation passage opening. This can be formed, for example, as a structural recess of the dome or as a region of the dome which is transparent to radiation in the IR region. Inside the dome or in the interior defined by the dome, an infrared detector, IR detector for short, is arranged. The IR detector is arranged opposite the radiation passage opening and has an absorption surface which is designed to absorb IR radiation. The absorption surface can be formed in particular by a plurality of discrete regions of a surface of a substrate, which are each coated with an IR-absorbing layer. These regions form pixels which each at least partially absorb the radiation emitted by the object. Furthermore, the seeker head has a calibration device according to one of the above-described embodiments arranged inside the dome. The matching device is retractable for performing nonuniformity correction between the radiation passage opening and the absorption surface of the infrared detector. Alternatively, the infrared detector is adjustably mounted in the dome such that the absorption surface of the infrared detector is oriented facing the calibration device.According to this aspect, the alignment device is therefore arranged within a seeker head, wherein the alignment device and the IR detector can be positioned relative to one another in such a way that the radiation body of the alignment device and the absorption surface of the IR detector are oriented facing one another. This can be realized, for example, by a translatory or a rotatory adjustability of the calibration device or of the IR detector. In particular, an actuator kinematically coupled to the dome and the calibration device or the IR detector can be provided in each case for carrying out the respective adjustment movement. Optionally, the calibration device or the IR detector can each be additionally coupled to the dome via a guide device which defines a movement path of the calibration device or of the IR detector.According to one embodiment of the seeker head, an optical radiation directing device, in particular in the form of a lens or a lens arrangement, can be arranged between the radiation passage opening and the infrared detector.Not according to the invention, a method for performing an nonuniformity correction of an infrared detector in a seeker head of a guided missile may be provided. The method according to the invention has in particular the following method steps:arranging a matching device configured according to any one of the above-described embodiments and the infrared detector relative to each other such that an absorption surface of the infrared detector is oriented facing the radiation body of the matching device;setting, optionally regulating a temperature of the radiation body to a predetermined adjustment temperature; andcalibrating respective detected temperatures to the predetermined calibration temperature by means of individual pixels of the absorption surface.The setting of the adjustment temperature comprises in particular heating the radiation body, for example by means of a heating device, to a setpoint temperature. This can be effected, for example, by simple setting of a specific, for example constant, heating power over a predetermined time period which is dependent on the actual temperature of the radiation body at the beginning of the heating process. This start-actual temperature can be determined, for example, by means of an optional temperature sensor thermally coupled to the heating device or the radiation body. Alternatively, a temperature measured elsewhere in the seeker head can also be used as an approximate start-actual temperature. Starting from this start-actual temperature, a heating power is set over a certain duration. The time duration can be stored in a value table in which a time duration is assigned to a value for the start-actual temperature and a value for the heating power. The value table can have been determined empirically, in particular.Alternatively, a regulation of the heating power can be provided, for example by means of a control device which uses as a controlled variable, for example, the approximate actual temperature of the radiation body detected by an optional temperature sensor thermally coupled to the heating device.The adjustment temperature can be in particular in a range between 0 degrees Celsius and 60 degrees Celsius, preferably in a range between 10 degrees Celsius and 30 degrees Celsius and in particular preferably between 18 degrees Celsius and 22 degrees Celsius. In this range, particularly accurate results of the NUC are achieved.The invention is explained below with reference to the figures of the drawings. Of the figures, FIG. 1 is an exploded perspective view of a calibration apparatus according to an embodiment of the present invention; FIG. 2 shows a perspective view of the calibration device shown in FIG. 1 in the mounted state; FIG. 3 is a schematic sectional view of a seeker head; and FIG. 4 is a schematic sectional view of a seeker head.In the figures, the same reference numerals designate identical or functionally identical components, unless indicated to the contrary.FIG. 1 is an exploded view of a matching apparatus 1. the matching apparatus 1 for performing nonuniformity correction of an infrared detector 102 in a seeker head 100 of a guided missile. As shown in FIG. 1, the adjusting device 1 has a radiation body 10, a heating device 20 for setting an adjusting temperature of the radiation body 10, an optional temperature sensor 30 and an optional holding device 40. FIG. 2 shows the calibration device 1 shown in FIG. 1 as an exploded illustration in an assembled or assembled state.The heating device 20 is thermally conductively coupled to the radiation body 10. As shown in FIG. 1 by way of example, the heating device 20 can have a carrier film 21 and an electrical resistance heating wire 22. The carrier film 21 is designed as a film extending in a planar manner and can have, in particular, a polygonal circumferential shape, in particular an approximately trapezoidal circumferential shape, as is illustrated by way of example in FIG. 1. Furthermore, recesses 26 can be formed in the carrier film 21, which are provided for the passage of fastening devices, such as screws, bolts or the like. The carrier film 21 can be formed in particular from kapton.The resistance heating wire 22 can be integrated, for example, into the cross section of the carrier film 21. Alternatively, the resistance heating wire 22 can be arranged on a first surface 21 aof the carrier film 21, in particular printed on this surface 21 a. The first surface 21 aconstitutes a contact surface 20 aof the heating device 20. the resistance heating wire 22 runs in a heating wire pattern M 22 on the carrier film 21. the heating wire pattern M 22 can in particular have a meandering course in a serpentine manner, as is illustrated by way of example in FIG. 1. However, it is also conceivable for the heating wire pattern M 22 to have a spiral, zigzag-shaped or comparable course. As is schematically shown in FIG. 1, connection points 23, 24 are provided at the ends of the heating wire 22, via which connection points the heating wire 22 can be connected by means of electrical connection cables 25 to an electrical current source (not shown), in particular a direct current source.As shown in FIGS. 1 and 2 by way of example, the radiation body 10 can have a planar shape. In particular, the radiation body 10 can be designed as a curved shell with a circular circumference, as is shown by way of example in FIG. 1. In general, the radiation body can be designed as a thin plate-shaped or disk-shaped component with or without curvature. The radiation body 10 has a first surface 10 awhich is provided as a reference surface for emitting thermal radiation. Furthermore, the radiation body 10 has a second surface 10 b oriented opposite the first surface 10. The radiation body 10 shown by way of example in FIG. 1 can have, in particular, a thickness d 10 in a range between 0.1 mm and 4 mm, in particular between 1 mm and 3 mm, and a diameter e 10 in a range between 4 mm and 250 mm, in particular between 10 mm and 15 mm. The thickness d 10 can be understood here in particular as a smallest possible distance between a point of the first surface 10 aand a point of the second surface 10 b. The diameter e 10 can be understood in particular as the diameter of the circular circumference or, in the case of a non-circular circumference, as the maximum distance between two points situated on the circumference. The radiation body 10 can be realized in particular as an aluminum body. Optionally, at least the first surface 10 aof the radiation body 10 is coated with a black cover layer which has a high emission coefficient in the IR range.The thermally conductive coupling of the radiation body 10 to the heating device 20 can be realized, for example, by a two-dimensionally contacting arrangement of the radiation body 10 on the contact surface 20 aof the heating device 20. As shown in FIG. 1, for example, the second surface 10 bof the radiation body 10 can be contacted with the first surface 21 aof the carrier film 20. Optionally, the first surface 21 aof the carrier film 20 and the second surface 10 bof the radiation body 10 are bonded to one another. The planar configuration of heating device 20 and radiation body 10 achieves an improved planar distribution of the heat output by heating device 20. In particular, a temperature gradient across the first surface 10 of the radiation body 10 is reduced.The optional temperature sensor 30 is provided for detecting a temperature of the heating device 20 and thus for approximately detecting the temperature of the radiation body 10. The temperature sensor can be implemented in particular as a temperature-dependent electrical resistor, for example as a PT-1000 element, which is thermally coupled to the heating device. As shown in FIG. 1, the temperature sensor 30 can be attached, for example, to the second surface 21 bof the carrier film 21 and thus opposite the radiation body 10. This reliably prevents the radiation emission from being influenced by the temperature sensor 30.The carrier film 21 can be fastened in particular to the optional holding device 40, as is shown by way of example in FIG. 2. The holding device 40 thus serves for the mechanically fixed mounting of the carrier film 21, The holding device 40 can in particular have a carrier device 41. As is shown by way of example in FIGS. 1 and 2, the carrier device 41 can be designed in particular as a fork-shaped component with a web 44 and two limbs 45, 46 extending therefrom. The web 44 and the legs 45, 46 together define a recess 42 which is optionally interrupted at a location opposite the web 44, as is shown by way of example in FIG. 2. Generally, the carrier part 41 is realized as a plate-shaped or shell-shaped component with a recess 42. The recess 42 has a diameter e 42 which is greater than the diameter e 10 of the radiation body 10. In FIGS. 1 and 2, two recesses 47 are provided by way of example, which are formed in the web 47 at a distance from one another.As is shown in FIG. 2 by way of example, the carrier film 21 is fastened to the carrier part 41. The radiation body 10 is arranged in the recess 42. The larger diameter e 42 of the recess 42 of the carrier part 41 forms an air gap 43 between the radiation body 10 and the carrier part 41. This achieves good thermal insulation between the carrier part 41 and the radiation body 10.FIGS. 3 and 4 each schematically show a sectional view of a seeker head 100 of a guided missile. The seeker head 100 comprises a dome, an infrared detector 102, abbreviated IR detector, the above-described calibration device 1 and an optional optical radiation directing device 104.Dome 101 defines an interior space I of the seeker head. Furthermore, the dome 101 has a radiation passage opening 103, which can be formed, for example, in the region of an apex of the dome 101 as shown in FIGS. 3 and 4. The beam passage opening 103 enables infrared radiation (IR radiation) to penetrate into the interior I. The beam passage opening 103 is shown symbolically in FIGS. 3 and 4 as a structural opening of the dome 101, wherein the beam passage opening 103 can also be formed as a region formed from a material transparent to IR radiation.The infrared detector 102 has an absorption surface 102 awhich is configured to absorb IR radiation. The absorption surface 102 acan be formed in particular by a plurality of discrete regions of a surface of a substrate which are each coated with an IR-absorbing layer (not illustrated). These regions form pixels which each at least partially absorb the radiation emitted by an object. As shown in Figs. 3 and 4, the infrared detector 102 is disposed opposite to the radiation passage 103.The balancing device 1 is likewise arranged in the interior I of the dome 101, as is shown in FIGS. 3 and 4.As is shown by way of example in FIG. 3, it can be provided that the IR detector 102 is arranged in a fixed manner within the interior space I of the seeker head 100, wherein the absorption surface 102 ais oriented facing the radiation passage opening 103. In this case, the matching device 1 is retractable between the radiation passage opening 103 and an absorption surface 102 aof the infrared detector 102. As shown schematically in FIG. 3, the alignment device 1 can be moved in particular between an alignment position in which the alignment device 1 is arranged between the radiation passage opening 103 and the absorption surface 102 aof the IR detector 102 and the first surface 10 aof the radiation body 10 faces the absorption surface 102 aand a return position in which the alignment device 1 is positioned outside a projection region of the absorption surface 102 a. In FIG. 3, the adjustment device 1 is shown symbolically as a block, wherein this is shown with a dashed line in the return position of the adjustment device 1 and with a full line in the adjustment position of the adjustment device 1. The translatory movement between the return position and the adjustment position is symbolically represented in FIG. 3 by the arrow P 1 and can be realized, for example, by an adjusting drive (not represented).Alternatively, it can also be provided that the balancing device 1 is arranged in a fixed position in the interior I of the dome 101 and the infrared detector 102 is mounted in the dome 101 so as to be adjustable in such a way that the absorption surface 102 ais oriented facing the balancing device 1, as is illustrated in FIG. 4. In this case, the IR detector 102 is therefore movable between an operating position in which the absorption surface 102 ais oriented facing the radiation passage opening 103 and a matching position in which the absorption surface 102 ais oriented facing the first surface 10 aof the radiation body 10 of the matching device 1. This can be realized, for example, by rotatably mounting the IR detector 102 in the dome 101. In FIG. 4, the IR detector 102 is shown symbolically as a block, wherein the latter is shown with a dashed line in the calibration position and with a full line in the working position. The rotational movement of the IR detector between the working position and the adjustment position is symbolically represented in FIG. 4 by the arrow P 2 and can be realized, for example, by an adjusting drive (not represented).The optional optical radiation directing device 104 can be realized, for example, in particular in the form of a lens or a lens arrangement and is arranged between the beam passage opening 103 and the IR detector.In order to perform nonuniformity correction of the infrared detector 102 in the seeker 100, the matching device 1 of the infrared detector 102 are arranged relative to one another in such a way that an absorption surface 102 aof the infrared detector 102 is oriented facing the radiation body 10 of the matching device 1. This can be realized, for example, by setting the adjustment position of the IR detector 102 or by moving the adjustment device 1 into the adjustment position. Furthermore, the temperature of the radiation body 10 is adjusted to a predetermined adjustment temperature. For this purpose, the radiation body is heated to a desired temperature by means of the heating device 20. This can be effected, for example, by simple setting of a specific, for example constant, heating power over a predetermined time duration which is dependent on the actual temperature of the radiation body 10. A regulation of the heating power can also be provided, for example by means of a control device (not shown), which uses as a controlled variable, for example, the actual temperature of the radiation body 10 detected by the optional temperature sensor. For example, a temperature in a range between 0 degrees Celsius and 60 degrees Celsius may be set as the target temperature. Subsequently, the temperatures respectively detected by means of individual pixels of the absorption surface 102 aare calibrated to the predetermined adjustment temperature. During calibration, the output signals of the individual pixels are corrected in such a way that they each represent the temperature set at the radiation body of the calibration device.LIST OF REFERENCE CHARACTERS1 Calibration device 10 Radiation body 10 aFirst surface of the radiation body 10 bSecond surface of the radiation body 20 Heating device 20 aContact surface of the heating device 21 Carrier film 21 aFirst surface of the carrier film 22 Resistance heating wire 23, 24 Connection points 25 Connection cable 30 Temperature sensor 40 Holding device 41 Carrier part 42 Recess of the carrier part 43 Air gap 44 Web 45, 46 Leg 47 Mounting recesses M 22 Heating wire pattern 100 Seeker head 101 Dome 102 Infrared detector 102 aAbsorption surface of the infrared detector 103 Radiation passage opening 104 Optical radiation directing device d 10 Thickness of the radiation body e 10 Diameter of the radiation body e 42 Diameter of the recess of the carrier part I Interior space P 1, P 2 Arrow

Claims

A calibration device (1) for performing an nonuniformity correction of an infrared detector (102) in a seeker head (100) of a guided missile, comprising: a radiation body (10); a heating device (20), which is coupled to the radiation body (10) in a thermally conductive manner, for setting a predetermined calibration temperature of the radiation body (10), wherein the heating device (20) has a carrier film (21) and an electrical resistance heating wire (22), which runs in a heating wire pattern (M22) on the carrier film (21); and a holding device (40), to which the carrier film (21) is fastened; wherein the holding device (40) has a carrier part (41), which defines a recess (42), which at least partially surrounds the radiation body (10), and wherein an air gap (43) is formed between the radiation body (10) and the carrier part (41).The calibration device (1) according to claim 1, wherein the radiation body (10) has a planar shape.The calibration device (1) according to claim 2, wherein the radiation body (10) is configured as a curved shell having a circular circumferenceThe balancing device (1) according to claim 2 or 3, wherein the radiation body (10) has a thickness (d10) in a range between 0.1 mm and 4 mm and a diameter (e10) in a range between 4 mm and 250 mm.The calibration device (1) according to any one of the preceding claims, wherein the radiation body (10) is formed as an aluminium body, wherein preferably at least a first surface (10a) of the radiation body (10) is coated with a black cover layer.The calibration device (1) according to any one of claims 2 to 5, wherein the radiation body (10) lies flat against a contact surface (20a) of the heating device (20).Calibration device (1) according to one of the preceding claims, additionally comprising a temperature sensor (30) for detecting a temperature of the heating device (20).

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