DE102012010461A1 - Method for correcting reflected radiation portion in electromagnetic radiation of investigation object, involves assigning numerical value of reflected radiation portion corresponds to certain solid angle region from radiation - Google Patents

Abstract

The method involves determining solid angle regions in test structure such as specimen by detecting reflected electromagnetic radiation (4) of investigation object (5), from which detected reflected radiation is incident on test structure. The numerical value of reflected radiation portion (7) corresponds to certain solid angle region is assigned from the sensed reflected electromagnetic radiation of investigation object. An independent claim is included for measurement device.

Description

The invention relates to a method for correcting a reflected radiation component in a spatially resolving measurement result, wherein the measurement result is obtained by detecting electromagnetic radiation from an examination subject in a non-visible spectral region and wherein a reflected radiation component, which is caused by reflection of the background radiation on the examination subject, is corrected in the measurement result.

The invention further relates to a measuring device with a detector for detecting electromagnetic radiation in a non-visible spectral range and with means for obtaining a spatially resolving measurement result of an examination subject from the detected radiation and with means for automatically correcting the spatially resolving measurement result by a reflected radiation component.

Such methods and measuring devices are known and used to be able to correct the measurement result, a temperature measurement or a thermal image in order to correct the reflected radiation component, the so-called reflected temperature, such that the measurement result reproduces the temperature of the examination subject with the greatest possible accuracy.

It has been found that such a correction requires a great deal of experience, since the radiation incident on the examination object and reflected by the measuring device is not directly visible.

The invention has for its object to improve the performance characteristics of a measuring device of the type described above.

According to the invention, in order to achieve this object, it is proposed in a method of the type described above that electromagnetic radiation reflected at a test specimen is detected, that a solid angle range is determined from which the detected reflected radiation has impinged on the specimen, and that from the detected reflected radiation a numerical value for a reflected radiation component is derived, which is assigned to the determined solid angle range. In this case, the electromagnetic radiation can be detectable and detected by a detector of a measuring device which is sensitive to the non-visible spectral range. Preferably, the detection of the electromagnetic radiation from the examination subject to produce the measurement result and the reflected electromagnetic radiation from the specimen for determining the spatial angle associated, reflected radiation component with the same detector of the measuring device. The invention has the advantage that the influence of the electromagnetic background radiation incident on the actual examination object can be reproduced with the specimen for at least one solid angle range. Thus, the proportion of electromagnetic background radiation incident on the examination subject from this solid angle range, which causes a falsification of the measurement result by reflection on the examination subject, can be easily calculated out. In simple terms, therefore, the specimen can be used to determine the reflected temperature incident from the solid angle range and to provide for the correction of the measurement result.

In this case, the detected reflected radiation can be associated with or be that spatial region from which the reflected radiation as background radiation has collapsed onto the specimen and / or the examination object or would be incident to be reflected to the measuring device.

The reflected electromagnetic radiation is preferably an infrared (IR) radiation. The advantage here is that the inventive method for temperature measurement and / or for creating a thermal image with corrected temperature information can be used as a measurement result. The background radiation can also be infrared radiation.

In this case, the measurement result can be recorded with a measuring device having an optical axis. Here, the at least one solid angle range can be arranged or aligned at an angle other than zero to the optical axis of the measuring device. This can be achieved by appropriate alignment of the specimen.

For example, the test specimen can be integrated into the measuring device according to the invention. For this purpose, the specimen may be given for example by the detector of the measuring device. The advantage here is that the solid angle range is predetermined by the measuring direction of the measuring device and can be easily determined. In this way, the electromagnetic radiation incident on the test specimen from a solid angle range and absorbed on the specimen can be detected directly.

In many applications, however, the specimen is formed separately from the measuring device. In this case, the incident on the specimen from the solid angle range and on the specimen in the direction of a detector of the Measuring device detects reflected electromagnetic radiation.

The derived numerical value can be used for preferably automatic correction of the reflected radiation component in the spatially resolved measurement result.

The test specimen according to the invention can be designed as a planar article or as a three-dimensional object.

In one embodiment of the invention, it can be provided that electromagnetic radiation incident on a test specimen from at least two solid angle ranges and reflected on the specimen is detected separately in the spectral range for the at least two solid angle ranges. Thus, the different influence of background radiation incident on the examination object from different directions can be detected and corrected for the measurement result separately for at least two directions or for each direction.

In this case, it can be provided that a numerical value for a reflected radiation component is derived in each case from the detected reflected radiation to each of the at least two solid angle ranges. Thus, it is possible to take into account that due to the surface shape, the electromagnetic radiation reflected in the direction of a measuring device originates from different solid angle ranges on the examination object. The correction of the measurement result is therefore verifiable.

The more different solid angle ranges can be processed separately, the better the influence of the background radiation incident on the examination subject, which falsifies the measurement result by reflections, can be corrected.

For example, it may be provided to detect at least three or even at least ten solid angle ranges separately. This can be achieved, for example, by designing the surface of the specimen or successively realigning the specimen.

Preferably, the reflected radiation detected separately for the at least two solid angle ranges is detected simultaneously. This can be carried out, for example, with a location-resolving detector which detects the reflected electromagnetic radiation associated with the respective solid angle regions in a spatially separate manner. In other embodiments, the radiation is detected separately in time.

For example, it can be provided that, from the numerical values for the reflected radiation components of the solid angle ranges, a further numerical value for a reflected radiation component for a further solid angle range is calculated by interpolation. Thus, the angular resolution of the detected radiation is not limited by the geometric design of the sample body.

For example, in this way the reflected component in the measurement result can be determined by an oblique surface, in which the reflected portions of a specimen, for example, horizontally aligned and an example at an angle thereto and / or vertically aligned reflection surface are detected separately from each other, wherein the reflected portion of electromagnetic radiation is determined by an oblique surface forming the examination object or belonging to the examination subject from a numerical ratio of the detected proportions determined by the helix angle by interpolation. Thus, the reflected component in the electromagnetic radiation from the examination subject in the measurement result can also be calculated out for the oblique surface.

It can be provided that the further solid angle range is predetermined by a surface element on the examination object, wherein the radiation reflected by the surface element has been incident on the examination object from the further solid angle range. Thus, the orientation of the surface element with respect to the specimen for calculating the reflected radiation fraction can be calculated by interpolation from the previously detected reflected or absorbed electromagnetic radiations which have dropped from the respective solid angle regions onto the specimen.

In order to detect the proportions of two hemispheres, it can be provided that a reflection surface, which reflects the electromagnetic background radiation incident from the solid angle range, is assigned to each of the at least two solid angle regions. In the simplest case, the test specimen can thus be designed as a two-dimensional object in the form of a cardboard card or the like.

The angular resolution of the detection of the reflected radiation components can be increased by selecting the number of different reflection surfaces greater than two. In this case, it is all the more favorable, the more different reflection surfaces are formed on the specimen. It is particularly favorable if the specimen is designed as a convex body. Here, by a convex body is meant a geometric body in which the connecting lines between all pairs of points on the surface of the specimen run through or in the specimen.

If, for example, the test specimen is designed as a polyhedron, then the surfaces of the test specimen each define planar reflection surfaces. In relation to the measuring direction to the measuring device, these reflection surfaces can each define a solid angle range from which background radiation incident on the test specimen is reflected to the detector of the measuring device.

In this way, for example, a tetrahedron set on the ground or a base defines three solid angle ranges, which are determined by the associated spatial directions of the surface normals. Analogously, the specimen may be formed as a cube, with which five solid angle ranges can be detected when the cube is placed with a surface on a substrate and measured from different spatial directions with the inventive method.

The specimen may, for example, also be embodied as a dodecahedron or as an icosahedron or as another, preferably regular, body. For example, the specimen may also be designed as a ball in order to detect infinitesimal solid angle ranges.

With appropriate orientation, a tetrahedron of the measuring device applies up to three reflection surfaces for which the reflected radiation can be detected from three solid angle ranges. A cube also applies to the measuring device with appropriate orientation to three reflection surfaces, which are compared to the tetrahedron employed to each other less steep. A dodecahedron of the measuring device with appropriate orientation to six reflective surfaces, with which thus six solid angle ranges can be detected separately. An icosahedron even applies ten reflecting surfaces to the measuring device when aligned. If all reflective surfaces are evaluated, then up to ten different solid angle ranges can be detected separately. This can be continued by more complicated geometric shapes. For example, a (semi-) sphere as a test specimen defines infinite solid angle ranges.

In order to be able to determine the reflected radiation component in the measurement result as accurately as possible, provision can be made for the specimen to be provided with reflection surfaces which each have a defined reflection coefficient. The advantage here is that defined reflection ratios are set to the specimen, which allow the most accurate determination of the reflected temperature. It can also be provided that the specimen is provided with reflection surfaces or is, which each have a defined angular dependence of the emission intensity. For example, it may be provided here that the reflection surfaces of the test specimen form Lambert radiators. The advantage here is that a weakening of the radiation due to an inclination of the reflection surfaces in relation to the recording direction is easy to correct, for example, if the angle of inclination is known or determined.

In one embodiment of the invention can be provided that the reflection surfaces of the specimen are each provided with an identification feature, which is automatically recognizable for identification of the associated reflection surface and is recognized. This can be a symbol or a shape or a color. Thus, it is achievable that the associated reflection surface is automatically recognizable and recognized. The advantage here is that an automatic detection of the reflected radiation components is feasible.

In an embodiment of the invention, provision may be made for a solid angle region assigned to a reflection surface to be calculated by evaluating a geometric shape and / or size of the reflection surface in a recording image which images the reflection surface. For example, for this purpose, the geometric shape and / or size of the reflection surface can be calculated in a spatially resolving measurement result which images the reflection surface. It can also be provided that the imaged shape and / or size is automatically compared with a stored shape and / or size. The advantage here is that the assignment of the solid angle range to the reflected electromagnetic radiation from the sample is carried out automatically. It is particularly advantageous if the reflection surfaces of the specimen have simple geometric shapes. Thus, the associated solid angle range can be determined by determining the geometric distortion of the shape in the recording, for example in the measurement result.

In an embodiment of the invention, it can be provided that a spatially resolving measurement result is created and evaluated for determining the numerical values, which images the examination subject and the test specimen. The advantage here is that the measurement of the examination subject and the measurement of the reflected radiation components are simultaneously feasible. Thus it can be avoided that the measurement conditions change between individual shots.

It can be provided that the specimen is aligned in a defined manner before detection of the radiation with respect to the cardinal directions. The advantage here is that a different influence of the cardinal directions associated reflected Temperatures or proportions of background radiation is easily detected. For example, the state of the sun can be taken into account.

It can also be provided that the specimen is aligned in a defined manner before detection of the radiation with respect to the examination object. The advantage here is that the provided by the specimen reflection surfaces are optimally exploitable.

In an embodiment of the invention, it can be provided that the radiation reflected by the specimen from different solid angle ranges is detected and evaluated in successive, separate steps. The advantage here is that the influence of the reflected temperature and / or the background radiation from an overall larger solid angle range can be detected. It can be provided that the orientation of the specimen is changed with respect to the measuring device between the individual steps.

For a typical application it can be provided that IR radiation, ie infrared radiation, is detected as electromagnetic radiation. This allows thermal images to be obtained and / or created as spatially resolving measurement results. The advantage here is that a reflected temperature correction value (reflected temperature coefficient, RTC), ie a reflected temperature, can be calculated in each case as the numerical value for the reflected radiation components.

In one embodiment of the invention can be provided that are used as solid angle areas each half spaces. The advantage here is that flat reflective surfaces can be used. For example, it can be provided that each reflection surface defines a half-space which encompasses or describes the solid-angle region associated with the reflection surface. If flat reflecting surfaces are used, the half-space can be defined by the half-space lying outside the test-piece on one side with respect to the reflection surface. If a ball or a part of a ball is used as the test specimen, the half-space can be defined, for example, by the half space lying on the side of a tangential plane facing away from the specimen on the specimen. Here, a half-space is understood to mean that part of the three-dimensional space which lies on one side with respect to an infinitely extended plane.

To achieve the object mentioned, it is provided according to the invention in a measuring device of the type mentioned at the beginning that means for carrying out a method according to the invention are designed and set up. Preferably, these means comprise a data processing unit which is set up to execute the method according to the invention by appropriate programming.

It is favorable if the reflected radiation component is caused by reflection of background radiation on the examination subject.

The invention will now be described in more detail with reference to embodiments, but is not limited to these embodiments. Further embodiments result from combining one or more features of the protection claims with each other and / or with one or more features of the embodiments.

It shows:

1 : a schematic representation for explaining the method according to the invention,

2 : an inventive use of a specimen in the method according to 1 .

3 a further test specimen according to the invention and

4 : the use of another test specimen according to the invention.

1 shows a highly schematic representation of a measuring device 1 which is set up in a manner known per se for recording and generating a spatially resolving measurement result.

To explain the principle of the invention and depicting a preferred embodiment, the measuring device 1 shown as a thermal imaging camera, with which thermal images can be created.

The measuring device 1 points behind a recording optics 2 a detector 3 which is used to detect IR radiation as electromagnetic radiation 4 is set up in a non-visible spectral range. The detector 3 Thus, in a manner known per se, has detector elements which are not further illustrated and which are responsible for the electromagnetic radiation 4 are sensitive. With the recording optics 2 is thus electromagnetic radiation 4 from an examination object 5 detectable and on the detector 3 be conducted.

In the measuring device 1 are means 6 for obtaining a spatially resolving measurement result in the form of a thermal image with temperature values from the detected electromagnetic radiation 4 from an examination object 5 , here for example a house trained. For example, the detector 3 be designed as FPA, or it may be set up a scanner technology.

In the measurement of electromagnetic radiation 4 Generally there is the problem that the electromagnetic radiation 4 a reflected radiation component 7 which of the background radiation 8th that comes from the object under investigation 5 in the direction of the measuring device 1 is reflected.

To the spatially resolved measurement result by the reflected radiation component 7 be able to correct so that the reflected radiation component 7 does not contribute to the corrected spatially resolving measurement result, the detector becomes 3 according to the simplified schematic diagram 2 on a test piece 9 directed.

This is where the detector becomes 3 first in the right position in 2 brought to the of the specimen 9 reflected electromagnetic radiation 10 to capture that from the to the specimen 9 radiating background radiation 8th arises.

Here, the background radiation 8th on a reflection surface 12 of the test piece 9 as reflected electromagnetic radiation in the direction of the measuring device 1 reflected. The background radiation 8th is from the reflection surface 13 of the specimen as reflected electromagnetic radiation 11 to the measuring device 1 reflected. The detector 3 Thus "sees" the reflection surfaces 12 and 13 ,

Out 2 it can be seen that the reflection surface 12 from a solid angle area 14 on the test object 9 irradiated background radiation 8th to the measuring device 1 reflected while the reflection surface 13 the background radiation 8th from a solid angle area 15 to the measuring device 1 reflected.

The test piece 9 is formed as a cube and thus has six sides, each having a square shape.

In the image, which of the specimen 9 with the measuring device 1 by receiving the reflected electromagnetic radiation 10 . 11 is created, these square shapes are geometrically distorted. From the distortion can be the inclination of the reflection surfaces 12 . 13 with respect to the take-up direction of the measuring device 1 automatically calculate.

From this, each of the reflection surface 12 respectively. 13 assigned solid angle range 14 respectively. 15 be determined. This solid angle area 14 . 15 results from the orientation of the surface normal, not shown, of the newly formed reflection surfaces 12 . 13 ,

The reflection surfaces 12 . 13 are with a coating 16 provided by which at the reflection surfaces 12 . 13 each having a defined reflection coefficient, and a defined angular dependence of the emission intensity, which applies to a Lampert radiator having.

From these defined reflection ratios at the reflection surfaces 12 . 13 can thus be derived from the reflected electromagnetic radiation 10 respectively. 11 derive a reflected temperature which corresponds to the respective solid angle range 14 respectively. 15 as a numerical value for characterizing the reflected radiation component relative to the solid angle range 14 . 15 assigned.

In 2 it can be seen that the specimen 9 with one side on a pad 17 is turned off. In this way it is achieved that the test object 9 in relation to the object under investigation 5 which is also on the underlay 17 is aligned, defined.

In this way it is achieved that the reflection surface 12 is arranged vertically.

With appropriate alignment of the specimen 9 on the underlay can be achieved that the vertical reflection surface 12 parallel to the one surface element 18 forming house wall of the examination object 5 is aligned. The test piece 9 becomes with the examination object 5 recorded simultaneously in a common recording, and it is created a spatially resolving measurement result, which the specimen 9 and the examination object 5 maps.

In this spatially resolved measurement result, the reflection surface 12 automatically identified. For this purpose, the reflection surface 12 not further illustrated identification features, such as markers or the like, to the reflection surface 12 automatically identify.

Because the reflection ratios due to the coating 16 on the test piece 9 may be known from the of this reflection surface 12 detected reflected electromagnetic radiation 10 directly the reflected radiation component 7 in the electromagnetic radiation detected for generating the spatially resolving measurement result 4 be determined. This is done using the reflection surface 12 due to their parallel alignment with the surface element 18 Background radiation 8th from the same solid angle range 14 to the measuring device 1 reflected as the surface element 18 even.

The previously calculated numerical value for the reflected temperature to the solid angle range 14 can thus be used to determine the reflected radiation component 7 for the surface element 18 be used.

The surface element 19 which is attached to the examination object 5 is formed by a roof surface is opposite to the surface element 18 inclined. The surface element 19 therefore reflects background radiation 8th from another solid angle area.

In the orientation of the specimen 9 according to 2 is not one of the sides of the specimen 9 parallel to the surface element 19 aligned.

With the detector 3 the measuring device 1 however, the reflected electromagnetic radiation became 10 from the reflection surface 12 and the reflected electromagnetic radiation 11 from the reflection surface 13 recorded separately and measured.

From the for the solid angle areas 14 and 15 In this case calculated numerical values, ie reflected temperatures, the reflected temperature to the inclined surface element 19 be calculated by interpolation.

In the described embodiment, the specimen 9 together with the examination object 6 by means of the detector 3 recorded to create a common, spatially resolving measurement result of the two objects in the form of a thermal image.

Out 2 it can be seen that the reflection surface 14 a half space is distinguished, which is above the specimen 9 lies. This half space forms the solid angle range 14 from which the background radiation is picked up and in the direction of the detector 3 can be reflected.

Likewise defines the reflection surface 13 a half-space in 2 to the right of an infinitely extended plane, which is the reflection surface 13 includes. The reflection surface 13 can background radiation 8th from this half-space to the detector 3 reflect.

In this way, a quarter of the full space remains, for which reason of the orientation of the reflection surfaces 12 . 13 no background radiation 8th on the detector 3 can be reflected. For this associated solid angle range, therefore, no reflected temperature can be determined as a numerical value for a reflected radiation component.

In order to determine a numerical value for this, in a second, separate step, the detector 3 in the in 2 left working position, and it is again the one from the specimen 9 reflected electromagnetic radiation 20 . 21 detected. In this position, the detector "sees" the reflection surface 12 and 23 ,

Here, the reflected electromagnetic radiation 20 through the at the reflection surface 12 towards the detector 3 reflected background radiation 8th determined while the background radiation 8th from a solid angle area 22 on the reflection surface 23 of the test piece 9 falls and in the direction of the detector 3 in the left pickup position as reflected electromagnetic radiation 22 is reflected.

Thus, in an analogous manner - as before to the reflection surfaces 12 and 13 described - from the reflected electromagnetic radiation 21 a numerical value for a solid angle range 22 associated, reflected radiation component are derived. In the exemplary embodiment, this is a reflected temperature that corresponds to the solid angle range 22 assigned.

3 shows a further sample according to the invention 9 , instead of the specimen 9 in 2 is usable according to the invention.

Here are functional or constructive to the embodiment according to 2 similar or similar components with the same reference numerals and not described separately again.

The test piece 9 points in an in 3 illustrated cross section in the shape of an octagon. This is due to the specimen 9 according to 3 one compared to the embodiment according to 2 larger number of reflective surfaces 12 . 13 . 23 . 24 formed, each background radiation 8th can detect from an individually assigned solid angle range and reflect to a measuring device not shown.

The angle-dependent influence of the background radiation 8th on the spatially resolving measurement result is thus detected in finer gradations.

4 shows a further embodiment in which the specimen 9 is formed spherical.

Also in the embodiment according to 4 are functional or constructive to the embodiments according to 2 and 3 similar or similar components with the same reference numerals and not described separately again.

Due to the spherical shape of the test specimen 9 are on the surface of the specimen 9 an infinite number of infinitely small reflection surfaces 12 . 13 . 23 . 24 formed, with which in each case from an associated solid angle region incident background radiation 8th to the detector 3 is reflected.

In this case, in a first step, the detector 3 in the right receiving position according to 4 spent, and it will be the reflected electromagnetic radiation 10 . 11 detected. In a second step, the detector becomes 3 in the in 4 left recording position, and it will be the reflected electromagnetic radiation 21 . 25 detected.

From the detected and reflected electromagnetic radiation 10 . 11 . 22 . 25 In each case, a reflected temperature is derived as a numerical value, these numerical values each having a very narrow solid angle range 14 . 15 . 26 . 27 are assigned due to the law of reflection the reflected electromagnetic radiation 10 . 11 . 21 . 25 is assigned respectively.

In this way results in a very fine angular resolution of the reflected temperature to the incident of the surrounding background radiation 8th ,

In 2 can the solid angle ranges 14 . 15 . 22 also smaller than the reflection surfaces 12 . 13 and 23 each associated half spaces. In this case, the solid angle ranges 14 . 15 . 22 also due to the law of reflection as the set of all those incident angles of background radiation 8th on the respective reflection surface 12 . 13 or 23 given due to the law of reflection in the direction of the detector 3 be reflected.

A corresponding definition of the assigned solid angle ranges to the reflection surfaces 12 . 13 . 23 . 24 is in the embodiment according to 3 realized.

It should be noted that the measuring device 1 not shown means 28 for the automatic correction of the spatially resolving measurement result by the reflected radiation component 7 wherein, in the correction, the determined numerical values depend on the associated solid angle ranges 14 . 15 . 22 . 26 . 27 Consideration.

In the measuring device 1 Finally, a data processing unit is set up by appropriate programming for carrying out the described method. These data processing units thus forms a means 29 for carrying out the method according to the invention.

In the measuring device 1 with one for receiving electromagnetic radiation 4 from an examination object 5 for establishing a spatially resolving measurement result equipped detector 3 is proposed for determining a reflected radiation component 7 in the recorded electromagnetic radiation 4 the on a test object 9 reflected electromagnetic radiation 10 . 11 . 20 . 21 . 25 to capture, in addition to the reflected electromagnetic radiation 10 . 11 . 20 . 21 . 25 one solid angle area each 14 . 15 . 22 . 26 . 27 is determined from which the reflected radiation 10 . 11 . 20 . 21 . 25 on the test piece 9 and from the measured reflected electromagnetic radiation 10 . 11 . 20 . 21 . 25 a the respective associated solid angle range 14 . 15 . 22 . 26 . 27 derived numerical value RTC for a reflected radiation component, which for determining the reflected radiation component 7 in the electromagnetic radiation 4 is usable and used.

Claims (13)

Method for correcting a reflected radiation component ( 7 ) in a spatially resolving measurement result, the measurement result being detected by detecting electromagnetic radiation ( 4 ) of an examination object ( 5 ) is obtained in a non-visible spectral range and wherein a reflected radiation component, which by reflection of background radiation ( 8th ) on the examination object ( 5 ) is corrected, is corrected in the measurement result, characterized in that on a specimen ( 9 ) reflected electromagnetic radiation ( 10 . 11 . 20 . 21 . 25 ) is detected that a solid angle range ( 14 . 15 . 22 . 26 . 27 ), from which the detected reflected radiation ( 10 . 11 . 20 . 21 . 25 ) on the specimen ( 9 ) and that from the detected reflected radiation ( 10 . 11 . 20 . 21 . 25 ) a numerical value for a reflected radiation component is derived which corresponds to the determined solid angle range ( 14 . 15 . 22 . 26 . 27 ). Method according to claim 1, characterized in that a specimen ( 9 ) from at least two solid angle regions ( 14 . 15 . 22 . 26 . 27 ) and on the specimen ( 9 ) reflected electromagnetic radiation ( 10 . 11 . 20 . 21 . 25 ) in the spectral range for the at least two solid angle ranges ( 14 . 15 . 22 . 26 . 27 ) is detected separately and / or that from the detected reflected radiation ( 10 . 11 . 20 . 21 . 25 ) to each of the at least two solid angle ranges in each case a numerical value for a reflected radiation component ( 10 . 11 . 20 . 21 . 25 ) and / or that from the numerical values for the reflected radiation components of the solid angle ranges ( 14 . 15 . 22 . 26 . 27 ) by interpolation another numerical value for a reflected radiation component is calculated for a further solid angle range. A method according to claim 1 or 2, characterized in that the further solid angle range by a surface element ( 18 . 19 ) on the examination object ( 5 ) is predetermined, whereby the surface element ( 18 . 19 ) reflected radiation from the further solid angle range on the examination subject ( 5 ) has fallen. Method according to one of claims 1 to 3, characterized in that on the test specimen ( 9 ) the at least two solid angle ranges ( 14 . 15 . 22 . 26 . 27 ) each have a reflection surface ( 12 . 13 . 23 . 24 ) associated with the from the solid angle range ( 14 . 15 . 22 . 26 . 27 ) incident background radiation ( 8th ) reflected. Method according to one of claims 1 to 4, characterized in that the test specimen ( 9 ) with reflection surfaces ( 12 . 13 . 23 . 24 ), which in each case have a defined reflection coefficient and / or a defined angular dependence of the emission intensity. Method according to one of claims 1 to 5, characterized in that the reflection surfaces ( 12 . 13 . 23 . 24 ) of the test specimen ( 9 ) are each provided with an identification feature which is used to identify the associated reflection surface ( 12 . 13 . 23 . 24 ) is automatically recognizable and recognized. Method according to one of claims 1 to 6, characterized in that a reflection surface ( 12 . 13 . 23 . 24 ) assigned solid angle range ( 14 . 15 . 22 . 26 . 27 ) by evaluation of a geometric shape and / or size of the reflection surface ( 12 . 13 . 23 . 24 ) in one the reflection surface ( 12 . 13 . 23 . 24 ) imaging and / or in a the reflection surface ( 12 . 13 . 23 . 24 ) imaging spatially resolving measurement result is calculated. Method according to one of claims 1 to 7, characterized in that for the determination of the numerical values a spatially resolving measurement result is created and evaluated, which contains the examination subject ( 5 ) and the specimen ( 9 ) maps. Method according to one of claims 1 to 8, characterized in that the test specimen ( 9 ) before detection of the reflected radiation ( 10 . 11 . 20 . 21 . 25 ) with respect to the cardinal points and / or the object to be examined ( 5 ) is aligned. Method according to one of claims 1 to 9, characterized in that the of the sample ( 9 ) from different solid angle ranges ( 14 . 15 . 22 . 26 . 27 ) reflected radiation ( 10 . 11 . 20 . 21 . 25 ) is recorded and evaluated in successive, separate steps. Method according to one of claims 1 to 10, characterized in that as electromagnetic radiation ( 4 . 10 . 11 . 20 . 21 . 25 ) IR radiation is detected and / or that thermal images are obtained and / or created as spatially resolving measurement results and / or that in each case a reflected temperature correction value (RTC) is calculated as the numerical value for the reflected radiation components. Method according to one of claims 1 to 11, characterized in that as solid angle ranges ( 14 . 15 . 22 . 26 . 27 ) half spaces are used and / or that each reflection surface ( 12 . 13 . 23 . 24 ) defines a half-space which corresponds to that of the reflection surface ( 12 . 13 . 23 . 24 ) associated solid angle range ( 14 . 15 . 22 . 26 . 27 ) comprises or describes. Measuring device ( 1 ), with a detector ( 3 ) for detecting electromagnetic radiation ( 4 . 10 . 11 . 20 . 21 . 25 ) in a non-visible spectral range and with means ( 6 ) for obtaining a spatially resolving measurement result from an examination object ( 5 ) from the detected radiation ( 4 . 10 . 11 . 20 . 21 . 25 ) and with funds ( 28 ) for the automatic correction of the spatially resolving measurement result by a reflected radiation component ( 7 ), characterized in that means ( 29 ) are designed and configured to carry out a method according to one of the preceding claims.

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