EP3516355A1 - Verfahren zur kontaktfreien ermittlung einer zweidimensionalen temperaturin-formation sowie infrarot-messsystem - Google Patents
Verfahren zur kontaktfreien ermittlung einer zweidimensionalen temperaturin-formation sowie infrarot-messsystemInfo
- Publication number
- EP3516355A1 EP3516355A1 EP17762102.6A EP17762102A EP3516355A1 EP 3516355 A1 EP3516355 A1 EP 3516355A1 EP 17762102 A EP17762102 A EP 17762102A EP 3516355 A1 EP3516355 A1 EP 3516355A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- infrared
- measuring system
- temperature information
- distance
- dimensional temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/0275—Control or determination of height or distance or angle information for sensors or receivers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/025—Interfacing a pyrometer to an external device or network; User interface
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/0265—Handheld, portable
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/08—Optical arrangements
- G01J5/0859—Sighting arrangements, e.g. cameras
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/80—Calibration
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J2005/0077—Imaging
Definitions
- the invention relates to a method for non-contact determination of a two-dimensional temperature information of a scene, in particular for non-contact determination of a thermal image of a scene, as well as a corresponding infrared measurement system.
- Devices and methods for the non-contact determination of a two-dimensional temperature information of a scene are known from the prior art and are used in a variety of applications, for example for the safety inspection of electrical circuits, for troubleshooting in machine processes or for the identification of insufficient heat insulation in the context of thermal and / or cold insulation.
- Infrared measuring systems such as infrared thermometers have the advantage of non-contact and rapid measurement compared to conventional temperature measuring devices and can be used in particular when areas to be measured are difficult or impossible to access.
- the temperature measurement by means of an infrared-sensitive thermometer is based on detection of thermal radiation, ie infrared radiation in a wavelength range between in particular 3 ⁇ and 50 ⁇ , which is emitted by each object depending on its temperature, in particular its surface temperature, with different intensity. From a non-contact measured intensity of the emit- Thermal radiation, a surface temperature of the emitting body or an emitting scenery can be determined.
- Infrared measuring systems for contact-free determination of a two-dimensional temperature information of a scene typically have an infrared-sensitive image sensor, a lens system and a screen and, like a camera operating in the visual spectral range, allow an object to be examined in the infrared region of the radiation spectrum and displayed on the screen as a two-dimensional image. often output color-coded image of the counter.
- DE 10 2014 226 342 A1 describes such an infrared
- the invention is based on an infrared measuring system, in particular a hand-held thermal imaging camera, for non-contact determination of a two-dimensional temperature information of a scene, in particular for non-contact determination of a thermal image of a scene, as described below.
- the infrared measuring system in particular the hand-held thermal imaging camera, has at least one infrared detector array consisting of a plurality of infrared radiation sensitive pixels and a distance determining device adapted to provide distance information between the infrared measuring system and the scene to investigate.
- an evaluation device is provided for evaluating the two-dimensional temperature information, in particular the thermal image, using the distance information with regard to a geometric size, in particular with regard to a distance and / or area, using the method described below.
- the "infrared measuring system” designates a device for non-contact measurement of a two-dimensional temperature information of a scene with the output of at least one two-dimensional temperature information concerning fenden information, for example, under the output of one or more temperature information, advantageously two or more temperature readings, a temperature distribution or the like.
- this two-dimensional temperature information can be in the form of a thermal image composed of a multiplicity of spatially resolved and / or spatially-resolved temperature measurement values.
- the infrared measuring system is set up for the non-contact determination of a two-dimensional temperature information of a scene, in particular for non-contact determination of a thermal image of a scene, to detect radiated infrared radiation in a solid angle range of the scenery.
- infrared radiation is to be understood as synonymous with heat radiation.
- the infrared radiation leaves the object or objects of the scenery in the direction of the infrared measurement system and is at least partially detected by the infrared measurement system.
- the solid angle range is defined by the inlet opening of the infrared measuring system or by the optical properties of the infrared measuring system (zoom, angle coverage, opening angle, etc.).
- the solid angle region (or, in the following, also the solid angle partial region) in this document should not only represent an integral measure (angle), but also defines a direction (the direction in which the opening angle is directed) which extends the solid angle area. In this sense, the solid angle region denotes a volume, and in particular, two equal solid angle regions have the same volume.
- the infrared measuring system has at least one
- the infrared detector array has a plurality of infrared radiation sensitive pixels.
- the infrared detector array detects infrared radiation emitted in the solid angle region and projected on its surface, and generates a detection signal based on the detected intensity of incident infrared radiation.
- the infrared detector array has a two-dimensional detection surface on a surface facing the scene, on which the plurality of infrared radiation-sensitive pixels is arranged.
- Each of the pixels of the infrared detector array can - assuming illumination by means of infrared radiation - determine image information and generate a detection signal therefrom.
- the detection signal provided by each pixel can then be used to determine temperature information.
- the detection signal of each pixel can be forwarded to the evaluation device of the infrared measuring system. From the evaluation device, the detection signal can be evaluated individually and / or in combination with detection signals of other pixels.
- Each pixel of the infrared detector array is an element sensitive to infrared radiation and is intended to detect radiation from the infrared range, in particular from the mid-infrared range in the wavelength range between 3 ⁇ m and 50 ⁇ m, and to convert it into a detection signal, in particular an electrical detection signal ,
- the detection signals generated by such radiation-sensitive elements are dependent on an infrared radiation intensity incident on the respective element.
- Examples of such elements which are sensitive to infrared radiation include photodiodes, bolometers, pyroelectric sensors, P / N diodes, PIN diodes, avalanche photo diodes (APD), (modulated) CCD chips and CMOS pixels, but others, For example, silicon sensors, indium gallium arsenide sensors, lead sulfide sensors, indium antimony sensors, cadmium mercury telluride sensors, gallium arsenide quantum well sensors, cadmium mercury telluride sensors, which appear useful to a person skilled in the art or the like based, infrared radiation sensitive elements are understood.
- the plurality of pixels are arrayed on the scene-facing surface of the infrared detector array.
- the number of pixels is for example 80 * 80 pixels, preferably 360x240 pixels, particularly preferably 640 * 480 pixels.
- the number of pixels defines the resolution of the infrared measuring system, ie in particular the resolution of a two-dimensional measured by means of the infrared measuring system Temperature information. Due to the matrix-like arrangement, a particularly homogeneous and, in particular, complete detection of infrared radiation can take place from the solid angle range, since the infrared detector array is provided homogeneously and in particular without gaps with pixels.
- Each of the pixels of the infrared detector array can be connected to the evaluation device directly or indirectly via further intermediate components by signal technology.
- an indirect signaling connection of the pixels with the evaluation device can also be realized via switching elements, for example multiplexers or other selection circuits, which are designed to selectively forward detection signals of a plurality of pixels. In this way, it can be achieved, in particular, that detection signals of individual pixels or of a group of pixels can be forwarded to the evaluation device independently of detection signals of other pixels and evaluated by the latter.
- the infrared measuring system can also be an optical system, in particular an imaging optical system for imaging infrared radiation from the
- Solid angle range on the infrared detector array Such optics is intended to project from the solid angle range emitted infrared radiation, preferably in the middle infrared spectrum in the wavelength range between 3 ⁇ and 50 ⁇ , on the surface of the view of the scenery behind the optics arranged infrared detector array or focus.
- the optics may in particular have infrared components which guide, conduct, bundle and / or otherwise influence the spatial propagation of optical components, for example lenses, mirrors or the like.
- an optic may be provided for a size of the solid angle range, ie a size of the measuring range of the infrared Measuring system to set using the optics changeable, in particular infinitely adjust "zoomable".
- the distance determining device of the infrared measuring system is configured to determine a distance information between the infrared measuring system and the scene to be examined, to which the infrared measuring system is directed.
- distance information is to be understood as meaning information relating to the distance or the distance between the infrared measuring system and the scene to be examined
- the distance information preferably comprises a length specification which in one exemplary embodiment may be specified in meters.
- the distance information can also be realized as a two-dimensional distance information.
- a two-dimensional distance information may, for example, be understood to mean distance information comprising distance and / or spatially resolved and / or spatially resolved, in particular pixel-resolved or pixel-related, distance information an associated distance to, which is determined between the infrared measuring system and the respective point or area of the scenery.
- the two-dimensional distance information for example in the form of a particular two-dimensional matrix, table, array, list or the like processed and / or stored ,
- this two-dimensional distance information can be interpreted as a "distance map" containing a depth profile of the scene to be examined.
- the distance determining device is implemented as a laser range finder or a stereo camera or as a scanning laser rangefinding system.
- a “stereo camera” is to be understood as meaning, in particular, at least two cameras arranged at a distance from one another, in particular cameras operating in the visual spectrum substantially simultaneously taking pictures of the scene from constructionally (slightly) different directions or perspectives in a solid angle region of the range finding device, simultaneously capturing stereoscopic fields required for 3D images.
- exposure control and possible focus adjustment of both cameras may be coupled.
- the cameras of the stereo camera have a distance ("base distance") of, in particular, less than 150 mm from each other, preferably less than 100 mm to each other, particularly preferably less than 80 mm, using the stereo camera an economically particularly favorable and structurally particularly simple realization of the distance-determining device can be specified Furthermore, a two-dimensionally resolved distance information, for example in the form of a two-dimensional distance map, can be determined using the stereo camera in a particularly simple and economically favorable manner.
- the distance-determining device is realized as a laser rangefinder and / or as a scanning laser rangefinding system, in particular as a LIDAR system.
- laser range finder an optical range finder that emits a time-modulated laser beam toward the scene
- the return light reflected or scattered from the scene, in particular an object of the scene, is at least partially detected by the laser range finder
- the intensity of the laser beam is time modulated, for example laser pulses can be emitted and a transit time of a laser pulse can be measured from the emission to the detection and Alternatively, a laser beam intensity can be time-periodically modulated in its intensity and a phase shift between the emitted and the detected laser signal can be used to determine the transit time and thus the distance to determine his scenery.
- the principle of laser distance measurement By the use of the laser rangefinder, a distance between the infrared measurement system and the scene can be determined in a particularly accurate manner, and the (here one-dimensional) distance information can be determined by the infrared measurement system further processing.
- a scanning laser distance measuring system combines the function of the laser distance measurement with a mechanical scanner, which offers the possibility to realize distance measurements sequentially under defined radiation angles in different directions or in different solid angle ranges.
- the scanning laser rangefinding system or LIDAR distance detection device
- LIDAR distance detection device
- the mechanical deflection unit can be realized in particular as a scanner using a micro-mirror is described for example in EP 01209441 B1.
- the distance-determining apparatus may be based on other distance-determining methods such as a radar measurement or the like familiar to a person skilled in the art, and is not limited to the above-mentioned embodiments.
- the infrared measuring system has an evaluation device, which is provided to evaluate the two-dimensional temperature information, in particular the thermal image, using the distance information with respect to a geometric quantity, in particular with regard to a distance and / or area.
- the “evaluation device” of the infrared measuring system is to be understood as meaning a device which has at least one information input for accepting detection signals and distance information, an information processing processing unit for processing, in particular evaluation of the assumed detection signals and distance information, as well as an information output for passing on the processed and / or evaluated detection signals and / or evaluation information.
- the evaluation device has components which comprise at least one processor, a memory and an operating program with evaluation and calculation routines.
- the electronic components of the evaluation device can be arranged on a printed circuit board or printed circuit board, preferably on a common board with a control device of the infrared measuring system for controlling the infrared measuring system.
- control device and the evaluation device can also be designed as a single component, for example in the form of a microcontroller.
- the evaluation device is intended to receive from the Inf rarot detector array generated detection signals, in particular from the signal-technically connectable with the evaluation pixels, evaluate and based on detection signals at least a plurality of illuminated pixels of the infra-infrared detector array an evaluation of the two-dimensional temperature information of the scenery perform.
- the evaluation device is preferably provided based on detection signals of at least one plurality of illuminated pixels, an evaluation of one or more temperature measurement values, in particular also averaged temperature measurement values, particularly preferably a thermal image.
- the evaluated two-dimensional temperature information in particular a thermal image, can be used by the evaluation device for further processing and / or output by a user of the infrared measurement system by means of a Output device and / or an external device can be provided by means of a data communication interface.
- the evaluation device is set up and provided for evaluating the two-dimensional temperature information, in particular the thermal image, with respect to a geometric variable, in particular with regard to a distance and / or a surface content, using the distance information according to the method according to the invention.
- the infrared measuring system has a screen, by means of which an information concerning the evaluated geometric size with the two-dimensional temperature information superimposed or superimposed, in particular with the thermal image superimposed or superimposed, can be displayed.
- the "overlay” is to be understood as meaning the superimposition, crossfading, combination or the like of at least the two-dimensional temperature information and the information regarding the evaluated geometrical variable, in this way a combined representation in the form of an "integrated image" can be realized.
- the combined representation is intended to be output by means of the screen to a user of the infrared measuring system.
- the overlaid or cross-faded representation represents an intuitively particularly understandable interpretation aid and / or presentation aid, which facilitates the interpretation and evaluation of the two-dimensional temperature information displayed by means of the screen to a user of the infrared measurement system.
- the infrared measuring system described serves as the basis for the method described below for non-contact determination of a two-dimensional temperature information of a scene, in particular for non-contact determination of a thermal image of a scene.
- the evaluation device of the infrared measuring system is designed and provided for carrying out the proposed method.
- the method for non-contact determination of a two-dimensional temperature information of a scene is based on the presented infrared measuring system and has at least the following method steps:
- the two-dimensional temperature information is evaluated using the distance information with regard to a geometric size, in particular with regard to a distance and / or a surface area.
- the evaluation device is set up and provided to evaluate the two-dimensional temperature information, in particular the thermal image, with respect to a geometric variable, in particular with regard to a distance and / or an area content, using the distance information.
- the evaluation device is provided for calculating geometric variables, for example distances, area contents, volumes, angles, solid angles or the like, using the two-dimensional temperature information and the distance information.
- the geometric quantity relates to at least one lateral distance, in particular a lateral distance of a freely selectable or automatically selected length, in the scenery.
- the two-dimensional temperature information recorded by means of the infrared measuring system, in particular the thermal image can be determined using the
- each pixel of the two-dimensional temperature information acquired by means of the infrared detector array corresponds to a known solid angle dependent on the angular resolution of the optics used.
- This solid angle can be converted into a distance, in particular a lateral distance, using the distance information between the infrared measuring system and the scene determined by means of the distance determining device.
- the evaluation device is set up to evaluate the two-dimensional temperature information with regard to a "distance.” Such a conversion can be carried out, for example, by means of a trigonometry. see function done.
- indirect, ie lateral, distance can be determined or calculated, which can be assigned to a distance of points located in the scene. For example, by defining the lateral distance to be determined indirectly by a selectable pixel spacing between two pixels in a displayed thermal image, a fundamental conversion of this pixel spacing (in the two-dimensional temperature information) into an actual distance of two can be obtained via the known angular resolution and the distance information Points in the scenery take place.
- a user of the infrared measuring system after selecting two pixels in a displayed thermal image, can be shown information about the real distance in the scenery - for example, in meters - blended with the thermal image.
- the geometric quantity relates to at least one position of at least one feature in the scene.
- a position of a feature identified in the two-dimensional temperature information can be determined by at least two distances with respect to the real position in the scene.
- the distances can be determined, for example, in two mutually perpendicular directions and thus allow a kind of coordinate specification of the identified feature with respect to the scenery.
- Such a coordinate specification may be defined, for example, in terms of a horizontal distance and relative to a vertical distance to a particular reference point (e.g., an edge or a corner) as an (x.y) indication.
- the geometric size relates to a surface area of an area, in particular an area of a freely selectable or automatically selected area, in the scenery.
- this calculation can be carried out using distances and / or angles determined, in particular for calculating arbitrary geometric figures using the two-dimensional temperature information and the distance information In this way it is easy to determine areas of, for example, rectangles, triangles, squares, etc.
- a user can select an area, for example defined over four pixels. which define the corners of a rectangle - in a displayed thermal image information about the real area - for example, in square meters - with the thermal image displayed blended.
- the surface is determined by a user of the infrared measuring system by specifying an isotherm.
- an isotherm for example in the form of a threshold temperature
- the two-dimensional temperature information can be searched as the basis for determining the surface area according to temperature values corresponding to the isotherm (or alternatively exceeding or falling short of this). Based on the area thus defined, for which the temperature values of the isotherms correspond (or alternatively exceed or fall below them), the real surface area can then be calculated in relation to the scenery.
- a two-dimensional distance information in particular a distance map
- the evaluation of the two-dimensional temperature information, in particular of the thermal image, with respect to a geometric size, in particular with respect to a distance and / or a surface area can be realized even more accurately.
- the scene to be examined in its lateral extent not perpendicular to the line connecting the infrared measuring system and the Scenery then using the two-dimensional temperature information, the angle between this connecting line and the lateral extension direction of the scenery can be taken into account.
- a kind of three-dimensional mathematical model can be set up in this way, which also allows the evaluation of the two-dimensional temperature information with regard to a volume information.
- the geometric variable is superimposed or superimposed on the two-dimensional temperature information, in particular overlaid or blended with the thermal image, on a screen, in particular a screen of the infrared measuring system.
- a combined representation can be realized in the form of an "integrated image.”
- the combined representation is intended to be displayed on the screen to a user of the infrared measurement system / or display aid, which facilitates the interpretation and evaluation of the two-dimensional temperature information represented by the screen for a user of the infrared measuring system
- a particularly simple and intuitively comprehensible examination of a scene can take place in which, for example, the extent or the surface area of thermal areas (eg cold bridges in building facades) is shown superimposed together with the determined two-dimensional temperature information
- the geometris surface size as a scale and / or as a size scale and / or as a dimensioned grid with the two-dimensional temperature information superimposed on the screen.
- a representation can take place as a subdivided scale and / or as a subdivided scale of sizes.
- “Subdivided” means that the scale has regularities in some form, for example realized as subsits, as interruptions, as symbols, as numerical values or the like. chen. The subdivision of the scale is used for intuitive reading of a length already without output of a single (a distance related) numerical value. So it is conceivable that the scale is displayed for example as a meter or centimeter scale.
- the geometric variable is displayed as a numerical value with the two-dimensional temperature information superimposed on the screen.
- the representation as a numerical value makes it possible to output the evaluation result to a user of the infrared measuring system in an especially fast manner. For example, a distance may be output as a metric in the form of "2 m".
- the geometric quantity is prepared as information which evaluates a physical property and / or an economy, in particular as information representing energy loss, with the two-dimensional temperature information superimposed on the screen.
- information evaluating physical property is meant, in particular, information that does not directly correspond to the two-dimensional temperature information, the distance information, or geometric quantity calculated from this information, such as a distance or a surface area. is rather to be understood as an evaluated or calculated information, which is determined on the basis of the determined two-dimensional temperature information, the distance information as well as on the basis of a calculated geometric quantity.
- the information evaluating a physical property allows at least a physical assessment or estimation of a property, for example based on an energy consideration (for example, consideration of an energy balance), a cost analysis (for example, consideration of a savings potential, consideration of the cost of renovation material in the determined area (eg Scaling with cost insulation material per square meter)), a profitability analysis (for example, profit-loss analysis) or the like.
- an energy consideration for example, consideration of an energy balance
- a cost analysis for example, consideration of a savings potential, consideration of the cost of renovation material in the determined area (eg Scaling with cost insulation material per square meter)
- a profitability analysis for example, profit-loss analysis
- FIG. 2 shows an embodiment of an infrared
- FIG. 3 shows a perspective, schematic rear view of an embodiment of the infrared measuring system according to the invention in front of a scene to be measured
- FIG. 4 shows the essential components of an embodiment of the infrared measuring system according to the invention
- FIG. 5 shows an embodiment of the method according to the invention
- FIG. 6 shows schematic representations of representations of a two-dimensional temperature information (a) without superimposition with a geometric information, (b) to (h) each with superimposition with a geometric information.
- FIG. 1 and Figure 2 show in each case an exemplary embodiment of this thermal imaging camera 10a in a perspective front view and in a perspective rear view.
- the thermal imaging camera 10a serves to determine a two-dimensional temperature information 12, in this embodiment a thermal image 12a, of a scene 14 to be examined.
- Scenery 14 may be any arrangement to be examined, typically including objects, particularly surfaces of objects, or the like. Examples of such a scene 14 may be a house facade (see Figure 3), a fuse box, a group of people, a landscape or the like.
- FIG. 3 A perspective, schematic rear view of a thermal imaging camera 10a according to the invention in front of a scenery 14 to be measured by way of example is shown in FIG.
- the thermal imaging camera 10a comprises a housing 16 with a handle 18. With the handle 18, the thermal imaging camera 10a can be conveniently held in one hand during use.
- the housing 16 of the thermal imaging camera 10a further has on a user 20 during use of the thermal imaging camera 10a side facing an output device in the form of a touch-sensitive screen 22 and controls 24 for user input and control of the thermal imaging camera 10a.
- the thermal imaging camera 10a also has a button 24a, with which a user can interrupt the non-contact determination of a two-dimensional temperature information 12 of the scene 14 to be examined and can freeze a thermal image 12a displayed on the screen 22.
- an inlet opening 28 is provided in the housing 16.
- the inlet opening 28 defines (possibly in cooperation with an optics of the thermal imaging camera 10a, not shown here) the detection area of the thermal imaging camera 10a.
- the detection range is shown in dashed lines in FIG. 3 by the solid angle region 30.
- the infrared radiation emitted in this solid angle area 30 by the scene 14, in particular by the objects of the scene 14, is detected by the thermal imaging camera 10a.
- a lens system as optics (not shown here).
- the lens system is transparent to radiation in the mid-infrared range and serves to focus infrared radiation to an infrared detector array (see reference numeral 48 in Figure 4, not shown here) of the thermal imaging camera 10a.
- a distance determination device 34 On the side 26 of the housing 16 remote from the user during the use of the thermal imaging camera 10a is a distance determination device 34 which is provided with distance information 36 (in FIG. 3 the distance information is shown schematically as a distance arrow 36) between the thermal imaging camera 10a and 10b to determine the scene to be examined 14.
- the distance determining device 34 consists of a laser rangefinder 34a, which is arranged in the housing 16 of the thermal imaging camera 10a.
- the distance information 36 is used to evaluate the two-dimensional temperature information 12, in particular the thermal image 12a, with respect to a geometric size, in particular with respect to a distance 38a and / or a surface content 38b (see the method in FIG. 5 and FIGS. 6, 7).
- the thermal imaging camera 10a can have a camera operating in the visual spectrum (not shown here in detail) for recording visual images. Such images can be output together with a thermal image 12a generated from a temperature measurement initiated by the user, in particular at least partially superimposed or superimposed with the thermal image 12a.
- the handle 18 On the underside of the thermal imaging camera 10a, the handle 18 also has a receptacle 40 for receiving an energy store 42, which may be embodied by way of example in the form of a rechargeable accumulator or in the form of batteries.
- electrical components of the thermal imaging camera 10a are mounted and interconnected inside the thermal imaging camera 10a, for example on a printed circuit board.
- the electrical components comprise at least one control device 44, an evaluation device 46 and an infrared detector array 48 for detecting infrared radiation entering the inlet opening 28 of the thermal imaging camera 10a.
- the control device 44 represents in particular in particular a device which comprises at least one control electronics and means for communication with the other components of the thermal imager 10a, in particular means for controlling and regulating the thermal imager 10a.
- the control device 44 is connected to the other components of the thermal imaging camera 10a, in particular the infrared detector array 48, the evaluation device 46, a data communication interface 50, the energy storage 42, a data memory 52, possibly a shutter mechanism 54 ("shutter"), but also with the Control elements 24,24a and the touch-sensitive screen 22 signal connected.
- the infrared detector array 48 of the thermal imaging camera 10a consists of a plurality of infrared radiation sensitive pixels 56.
- the pixels 56 are intended to emit infrared radiation from the infrared radiation spectrum in the solid angle region 30 from the scene 14 to be examined into the inlet opening 28 of the thermal imaging camera 10a enters (see Figure 3) to capture.
- Each pixel 56 is provided to provide an electrical detection signal at its output that correlates to the radiated heat output of the infrared radiation to the pixel 56.
- These pixel-dependent detection signals are output, individually or in combination with other detection signals of other pixels 56, first to the control device 44 of the thermal imaging camera 10a and forwarded by the latter to the evaluation device 46.
- the pixels 56 are realized as infrared radiation sensitive p / n diodes.
- the pixels 56 of the infrared detector array 48 are arranged in a matrix-like manner on the surface of the infrared detector array 48 facing the scenery 14.
- the number of pixels 56 in the illustrated embodiment is in particular 80 * 80 pixels, preferably 360 ⁇ 240 pixels, particularly preferably 640 ⁇ 480 pixels.
- the evaluation device 46 is used to receive and evaluate detection signals of the infrared detector array 48, wherein the evaluation device 46 performs an evaluation of the two-dimensional temperature information 12, in particular the thermal image 12a, the examined scene 14 based on detection signals at least a plurality of pixels illuminated by infrared radiation.
- the evaluation device 46 has at least one processor, a memory and an operating program with evaluation and calculation routine. on (each unspecified).
- the evaluated two-dimensional temperature information 12, in particular the generated thermal image 12a can be provided by the evaluation device 46 for further processing and / or output to a user of the thermal imager 10a by means of an output device and / or an external device by means of the data communication interface 50.
- the evaluation device 46 is provided to evaluate the two-dimensional temperature information 12, in particular the thermal image 12a, using the distance information 36 with respect to a geometric size, in particular with respect to a distance 38a and / or a surface content 38b.
- the thermal imaging camera 10a serves to acquire a thermal image 12a of the scene 14 to be examined.
- the determined thermal image 12a is composed of a multiplicity of spatially resolved and / or spatially resolved temperature measurements (corresponding to pixels of the thermal image 12a).
- the thermal imaging camera 10a is configured to detect infrared radiation emitted from or in the solid angle region 30 for non-contact determination of the thermal image 12a of the scene 14.
- FIG. 5 shows a method diagram which represents an embodiment of the method according to the invention for non-contact determination of the two-dimensional temperature information 12 of the scene 14, in particular for non-contact determination of the thermal image 12a of the scene 14.
- the method is intended to be operated by a thermal imaging camera 10a, as presented in connection with FIGS. 1 to 4.
- the user of the thermal imaging camera 10a directs the thermal imaging camera 10a toward the scene 14 to be examined in a first method step 200.
- the thermal imaging camera 10a measures infrared radiation from the solid angle region 30 by means of the infrared detector array 48.
- the respective detection signals of the infrared detector array 48 are sent to the evaluation device 46 from which they are evaluated and then available for further processing.
- two-dimensional temperature information 12 in particular a thermal image 12 a, is determined from measured infrared radiation.
- the ascertained two-dimensional temperature information 12 is transferred in step 204 via the screen 22 to the
- these three method steps can take place repeatedly, as indicated by the arrow 220.
- the user receives the thermal image 12a displayed on the screen 22 as a continuously updated thermal image 12a, in particular as a "live" image.
- the infrared measuring system 10 freezes the last detected thermal image 12a in step 208, so that, even with further movement of the infrared measuring system 10 in space, no update of the on-screen 22 illustrated thermal image 12a more occurs.
- a distance information 36 between the infrared measuring system 10 and the scene 14 is determined by means of the distance-determining device 34 of the infrared measuring system 10.
- the detection signals of the distance determination device 34 are forwarded to the evaluation device 46, from which they are evaluated and subsequently available for further processing.
- a manual definition of a geometric variable to be determined is carried out by the user of the thermal imager 10a.
- the user selects two or more points (for example four points for a surface) in the thermal image 12a output on the screen 22, via which he defines the distance 38a to be determined or the area to be determined with respect to a surface area 38b on the screen 22.
- the definition of the geometrical variable to be determined can also be automated.
- An automated definition can be done, for example, using an edge detection routine.
- an automated definition can also be made using a
- Threshold temperature so that the area whose surface area is is true, as defining all those areas of the scene for which the measured temperature is above or below the threshold temperature.
- the determined geometric size is then superimposed in method step 216 with the two-dimensional temperature information 12, in particular superimposed on the thermal image 12 a, displayed on the screen 22 of the infrared measuring system 10.
- the output to an external data device such as to a smartphone, to a computer or the like using the data communication interface 50 done.
- the data communication interface 50 is embodied in the illustrated embodiment as a WLAN and / or Bluetooth interface.
- an output to the data memory 52 for storing the determined data and thermal images 12a is conceivable.
- inventive method is initiated in this embodiment in response to a user input using the button 24a.
- the method can also be repeated at intervals, in particular regularly, preferably continuously or quasi-continuously, initiated.
- FIG. 6a shows, by way of example, a representation of a two-dimensional temperature information, in particular of a thermal image 12a, as is the case in particular on the screen of the thermal imaging camera 10a after the method step
- the figure represents the known from Figure 3 scenery 14 of a house facade to be examined. Areas of relatively high temperature 58 are shown in dashed lines, while areas of relatively low temperature 60 are not further marked. The regions of relatively high temperature 58 can be used as heat exchangers. be interpreted that indicate a lack of thermal insulation of the house facade.
- FIGS. 6b to 6h different representations of the same two-dimensional temperature information as shown in FIG. 6a are reproduced by way of example in FIGS. 6b to 6h, which, however, are superimposed with at least one geometric variable in each case.
- Such a representation is output on the screen 22 of the infrared measuring system 10 after the execution of the method step 216 of the method according to the invention.
- the geometric variable is shown as a scale 38c with the two-dimensional temperature information 12a superimposed on the screen 22.
- the geometric size is shown as a dimensioned grid 38d with the two-dimensional temperature information superimposed on the screen 22.
- the geometric size is shown as at least one lateral distance 38a, which relates to the scene, with the two-dimensional temperature information superimposed on the screen 22.
- the geometric size is displayed as a numerical value with the two-dimensional temperature information superimposed on the screen 22.
- the geometric size relates to at least one position 38e of at least one feature of the scene and is displayed on the screen 22 superimposed using at least two distances with the two-dimensional temperature information 12.
- the position 38e is displayed on the screen 22 superimposed using numerical values and arrows with the two-dimensional temperature information 12.
- the geometric size relates to an area 38b of an area in the scene 14. Specifically, the area 38b is displayed on the screen 22 using a numerical value and using a rectangle indicating the extent of the area superimposed on the two-dimensional temperature information 12 .
- the geometric size relates to a surface area 38b of an area in the scene 14, which is determined by specifying an isotherm (indicated by the inserted criterion "T> T S " at the bottom left) by the user of the infrared measuring system 10.
- the geometrical Size of the area is displayed on the screen 22 superimposed using a numerical value and using a two-dimensional mark with the two-dimensional temperature information 12.
- the geometric quantity relates to the evaluation of a physical property 38f, here by way of example the evaluation of an energy loss (in watts) by the cold bridge, which is displayed on the screen 22 superimposed on the two-dimensional temperature information 12.
- the geometric size is plotted on screen 22 using a numerical value and using a marker (here rectangles) for the energy loss contributing surfaces with the two-dimensional temperature information 12.
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Abstract
Description
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DE102016218295.1A DE102016218295A1 (de) | 2016-09-23 | 2016-09-23 | Verfahren zur kontaktfreien Ermittlung einer zweidimensionalen Temperaturin-formation sowie Infrarot-Messsystem |
PCT/EP2017/072103 WO2018054670A1 (de) | 2016-09-23 | 2017-09-04 | Verfahren zur kontaktfreien ermittlung einer zweidimensionalen temperaturin-formation sowie infrarot-messsystem |
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EP (1) | EP3516355A1 (de) |
CN (1) | CN109716080A (de) |
DE (1) | DE102016218295A1 (de) |
WO (1) | WO2018054670A1 (de) |
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DE102018210264A1 (de) | 2018-06-25 | 2020-01-02 | Robert Bosch Gmbh | Verfahren zur kontaktfreien Ermittlung einer Temperaturverteilung sowie Infrarot-Messsystem |
CN110243865B (zh) * | 2019-07-31 | 2024-01-16 | 龙岩学院 | 微电阻点焊质量双面红外检测系统与检测方法 |
CN111982966B (zh) * | 2020-08-11 | 2023-10-31 | 深圳大学 | 轨道结构无损及温度检测装置 |
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FR2817339B1 (fr) | 2000-11-24 | 2004-05-14 | Mensi | Dispositif de relevement tridimensionnel d'une scene a emission laser |
US7851758B1 (en) | 2005-09-29 | 2010-12-14 | Flir Systems, Inc. | Portable multi-function inspection systems and methods |
US8853631B2 (en) * | 2009-11-23 | 2014-10-07 | Flir Systems Ab | Camera with two visual imaging subsystems for determining parallax and for focusing an infrared imaging subsystem |
EP2634747A1 (de) * | 2012-02-29 | 2013-09-04 | Flir Systems AB | Verfahren und System zur Projektion einer sichtbaren Darstellung von Infrarotstrahlung |
CN102680111B (zh) * | 2012-06-01 | 2014-12-03 | 武汉迈迪克光电有限责任公司 | 一种可测量物体发热面积的红外热像仪及其测量方法 |
US8818079B2 (en) | 2012-08-07 | 2014-08-26 | Massachusetts Institute Of Technology | 3D radiometry |
CN102914261B (zh) * | 2012-09-29 | 2015-05-20 | 凯迈(洛阳)测控有限公司 | 非接触式热目标尺寸测量系统及方法 |
CN104155006B (zh) * | 2014-08-27 | 2017-03-01 | 湖北久之洋红外系统股份有限公司 | 一种手持红外热像仪及其对小目标快速锁定测距的方法 |
DE102014226342B4 (de) | 2014-12-18 | 2020-02-20 | Robert Bosch Gmbh | Wärmebildkamera |
DE102015102557B4 (de) * | 2015-02-23 | 2023-02-02 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Sichtsystem |
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2017
- 2017-09-04 WO PCT/EP2017/072103 patent/WO2018054670A1/de unknown
- 2017-09-04 EP EP17762102.6A patent/EP3516355A1/de active Pending
- 2017-09-04 CN CN201780058537.5A patent/CN109716080A/zh active Pending
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WO2018054670A1 (de) | 2018-03-29 |
DE102016218295A1 (de) | 2018-03-29 |
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