CN1821732A - Method and device for real-time correcting infrared measuring temperature - Google Patents
Method and device for real-time correcting infrared measuring temperature Download PDFInfo
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- CN1821732A CN1821732A CN 200610072947 CN200610072947A CN1821732A CN 1821732 A CN1821732 A CN 1821732A CN 200610072947 CN200610072947 CN 200610072947 CN 200610072947 A CN200610072947 A CN 200610072947A CN 1821732 A CN1821732 A CN 1821732A
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Abstract
This invention relates to a real-time calibration method and a device for infrared temperature test, which sets an infrared camera head used in collecting the infrared radiation signals of a tested object, sets a constant temperature source same to the infrared radiation rate of the tested object, in which, the source is on the same data collection surface with the tested object, the infrared radiation signals of the object and the constant temperature source are input into the computer to be processed to form a heat picture, at the same time, the real temperature value of the source is collected to get the temperature deviation value to calibrate the heat picture temperature data value of the tested object.
Description
Technical field
The invention belongs to a kind of system and method for infrared thermometry.
Background technology
Any material that is higher than absolute zero (273 ℃) of occurring in nature, himself all has certain infrared energy, and forms energy field around it.The infrared energy of different material may have different infrared wavelength range (for example the main infrared wavelength of human body is 8-14 μ m) and energy intensity.Infrared can the propagation with the form of light wave.The people can feel this infrared energy---temperature, but human eye can not observe directly infrared waves.By the thermal infrared imager that the infrared light sensing device is formed, can survey the object infrared emanation.When the infrared energy of testee is worth projecting environment, thermal infrared imager can be with the invisible infrared radiation energy of object, export to computing machine by being transformed into digital signal behind the infrared camera systematic collection, then by the size of computing machine according to these signals, tax converts image to after with certain color or briliancy, and is presented on the monitor.Thereby make sightless object infrared radiation field become visible image in spatial distributions, this kind image is called thermal map, and the color of image or briliancy can be represented the height of temperature.
In various infrared detection techniques are used, from detection accuracy, can be divided into two classes: low resolution and high resolving power, wherein high resolution need be differentiated the slight change that object temperature distributes, and the temperature variation that for example needs to differentiate in medical inspection requires usually less than 0.1 ℃.The trickle degree of surveying depends on detection accuracy---the temperature resolution and the optical space resolution of infrared video camera.
At present, domestic and international existing ir imaging system is problem of ubiquity all: the infrared thermal imagery instrument system is subjected to environment temperature, humidity, light, air quality, the infrared emittance of testee, the influence of factors such as distance is bigger, and be subjected to the factor affecting such as not intellectual of non-linear, test environment of thermonoise, the device of system self, cause it can not survey the absolute temperature of object.Therefore traditional infrared acquisition all is the relative temperature that is used for inspected object, promptly can only be used for the graded of Temperature Distribution of Measuring Object.Such application can cause two problems: the one, and accurate Measuring Object temperature, and some is used, particularly application medically is closely related with the real-time temperature of measured object again.In addition, even be used for the relative temperature of Measuring Object, when factors such as the thermonoise of system self, working temperature, test environment temperature change, cause the relative temperature difference also can be different.Whether in difference constantly, no matter is same object therefore, the comparability of detected infrared image is also very poor.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of method and device of real-time correcting infrared measuring temperature, adopt this method and device can eliminate the interference of extraneous factor effectively to the infrared temperature sensor acquired signal, the problem of temperature indeterminacy and thermal map comparability difference when solving infrared detection, and can measure measured object absolute temperature.
The method of real-time correcting infrared measuring temperature of the present invention comprises following content:
Infrared photography head system and the computing machine that can carry out data processing to the invisible infrared radiation energy signal of this system acquisition are set, it is characterized in that:
The constant temperature source of the temperature constant identical with the measured object infrared emittance is set simultaneously, and constant temperature source and measured object are on same data acquisition face;
Gather the invisible infrared radiation energy signal of measured object and constant temperature source simultaneously with described infrared photography head system, and be transformed into digital signal and be input to computing machine;
Real time temperature signal Synchronization with constant temperature source is input to computing machine as the sampling benchmark simultaneously;
With computing machine the infrared energy signal of measured body and constant temperature source is carried out data processing: compose to convert the thermal map image after certain color or the briliancy to according to the size of signal;
By computing machine the constant temperature source image in the thermal map is discerned, drawn its temperature data value; The actual temperature value of this temperature data value and constant temperature source being passed to synchronously computing machine compares, and obtains its deviate, with this deviate the thermal imagery temperature data value of measured object is calibrated again.
The further scheme of the inventive method is: the constant temperature source of described employing is the infrared emittance black-body resource identical with measured object.
The structure of real-time correcting infrared measuring temperature device of the present invention is: be provided with the infrared camera that is used to gather measured body infrared energy signal, described infrared camera is electrically connected with data handling machine, it is characterized in that: be provided with measured object on same data acquisition face and the infrared emittance constant temperature source identical with measured object, the temperature signal output terminal of constant temperature source is electrically connected with described computing machine.
Principle of work of the present invention is: with the constant temperature source of measured object on same data acquisition face serve as the sampling benchmark, the infrared photography head system becomes digital signal to be input to computing machine the measured object that collects and the infrared energy conversion of signals of constant temperature source, computing machine is composed to convert the thermal map image after certain color or the briliancy to its size according to signal, by software the constant temperature source image in the thermal map is discerned again, drawn its thermal imagery temperature data value; And the actual temperature data value that this thermal imagery temperature data value and constant temperature source are passed to computing machine synchronously compared, obtain its deviate, with this deviate the thermal imagery temperature data value of testee is calibrated then, and can obtain the kelvin rating of measured object.
Measured target and the constant temperature source scene that exists together when the present invention gathers the target thermal imagery is so comprise the thermal imagery temperature data of measured target and constant temperature source simultaneously in the infrared image that collects; And when the data occurrence temperature of infrared camera system collection is drifted about, because it is known being input to the constant temperature source actual temperature of computing machine synchronously, so can obtain the drift bias value of constant temperature source, and same data acquisition scene is identical to the influence of testee and constant temperature source, so the temperature drift deviate of available constant temperature source is calibrated the measured value of measured object, and can obtain the actual kelvin rating of testee.
The present invention can eliminate the interference of extraneous factor to the infrared temperature sensor acquired signal effectively, thus the problem of temperature indeterminacy and thermal map comparability difference when having solved infrared detection preferably, and can measure the kelvin rating of measured object more exactly.
Description of drawings
Fig. 1, the embodiment of the invention 1 structural representation
Fig. 2, the embodiment of the invention 1 single-point black-body resource-infrared picture data acquisition software process flow diagram
Fig. 3, the embodiment of the invention 2 multiple spots black-body resource-infrared picture data acquisition software process flow diagram
Specific embodiments:
This example is a kind of real-time correcting infrared measuring temperature method and device that is used for the human body thermometric.
Referring to Fig. 1, the device that the example method adopts is provided with infrared camera 5, infrared camera is electrically connected with computing machine 6 by data line, and be provided with the framework 1 that to locate measured object 3, in framework, be provided with the constant temperature source 2 that is in same data acquisition face with measured object and can in test, keeps temperature constant, the infrared emittance of constant temperature source is 0.98, and is identical with the infrared emittance of human body, and the central temperature output terminal of constant temperature source is connected with the reference signal input end of computing machine.
The model that above-mentioned infrared camera adopts the big company in Chongqing to sell is the product of ATIR-M301.
It is the low temperature black-body resource of RS-BB01 that constant temperature source adopts model, and thermostat temperature is 35 ℃.
The process of carrying out infrared thermometry with said apparatus is:
Gather the invisible infrared radiation energy signal of measured object and black-body resource simultaneously with infrared camera, and convert digital data transmission to computing machine;
Real time temperature signal Synchronization with constant temperature source is input to computing machine RS-232 data communication interface simultaneously, as the sampling benchmark;
What this example adopted is single-point black matrix-infrared picture data acquisition mode, promptly black-body resource is gathered the temperature value Tc of its central point as standard for manual sampling, obtain black-body resource center thermal imagery temperature data value Tc ' by computing machine, use the offset t=Tc-Tc ' of black-body resource center actual temperature value Tc and black-body resource center thermal imagery temperature data value Tc ' that the each point temperature data value of measured object thermal imagery is calibrated again.
Referring to Fig. 2, computing machine to the acquisition process step of above-mentioned data is:
101: start gatherer process;
102: receive infrared image (frame) data from infrared camera;
103: deposit above-mentioned infrared data in data buffer;
104: promptly went back to for 102 steps if receive the instruction that continues image data; Promptly forward step 105 to if receive the instruction of end data collection;
105: visit RS-232 data communication interface, read black-body resource central temperature value Tc;
106: from the data buffer, find out the infrared thermal-image data of black-body resource, and calculate the mean value Tc ' of black-body resource center thermal imagery temperature data;
107: the side-play amount of calculating black-body resource central temperature Tc and black-body resource center thermal imagery temperature data mean value Tc ':
Δt＝Tc-Tc’；
108: show infrared image, and with the temperature data value T ' of the thermal map image each point of the former infrared system image data formation of Δ t value calibration, make the image each point temperature data value after the calibration
t＝T’(DataBuf[row][col])+Δt
In the formula: T ' is the temperature computation expression values of former infrared system image data
Row is the capable subscript variable of two-dimensional array DataBuf
Col is the row subscript variable of two-dimensional array DataBuf
109:, promptly forward 110 to if receive END instruction; If do not receive END instruction, promptly forward 102 to;
110: the data that obtain are deposited in the disk file;
111, finish gatherer process.
As different from Example 1: this routine black-body resource has two temperature output terminals of central temperature and skin temperature to be connected with computing machine, and the corresponding multiple spot black matrix-infrared picture data acquisition mode that adopted, promptly black-body resource is gathered its center temperature value Tc and 2 temperature values of skin temperature value Ts as standard for manual sampling, obtain black-body resource center thermal imagery temperature data value Tc ' and shell thermal imagery temperature data value Ts ' by computing machine, use the temperature drift rate that obtains by above-mentioned data again
K=(Ts-Tc)/(Ts '-Tc ') the each point temperature data value of measured object thermal imagery is calibrated.
Referring to Fig. 4, computing machine comprises the acquisition process step of above-mentioned data:
201: start gatherer process;
202: receive infrared image (frame) data from infrared camera;
203: deposit above-mentioned infrared data in data buffer;
204: promptly went back to for 202 steps if receive the instruction that continues image data; Promptly forward step 205 to if receive the instruction of end data collection;
205: visit RS-232 data communication interface, read black-body resource central temperature Tc and black-body resource skin temperature Ts;
206: from the data buffer, find out the infrared thermal-image data of black-body resource, and calculate black-body resource center thermal imagery temperature data value Tc ' and black-body resource shell thermal imagery temperature data value Ts ';
If be provided with a plurality of black-body resources, then above-mentioned Tc ' is the mean value of a plurality of black-body resources center thermal imagery temperature data; Ts ' is the mean value of a plurality of black-body resource shell thermal imagery temperature datas;
207: according to the temperature drift rate of black-body resource thermal imagery temperature data value in the above-mentioned data computation infrared thermal imagery that obtains:
k＝(Tc-Ts)/(Tc’-Ts’)
208: show infrared image, and revise the temperature data value T ' of the thermal map image each point of former infrared system image data formation, make revised image each point temperature data value with temperature drift rate k value
t＝(T’(DataBuf[row][col])-Ts’)*k+Ts
In the formula: T ' is the temperature computation expression values of former infrared system image data
Row is the capable subscript variable of two-dimensional array DataBuf
Col is the row subscript variable of two-dimensional array DataBuf
209:, promptly forward 210 to if receive END instruction; If do not receive END instruction, promptly forward 202 to.
210: the data that obtain are deposited in the disk file;
211, finish gatherer process.
Has higher accuracy with this routine multipoint mode black matrix-infrared picture data acquisition method thermometric.
Claims (6)
1, a kind of method of real-time correcting infrared measuring temperature comprises following content:
Infrared photography head system and the computing machine that can carry out data processing to the invisible infrared radiation energy signal of this system acquisition are set, it is characterized in that:
The constant temperature source of the temperature constant identical with the measured object infrared emittance is set simultaneously, and constant temperature source and measured object are on same data acquisition face;
Gather the invisible infrared radiation energy signal of measured object and constant temperature source simultaneously with described infrared photography head system, and be transformed into digital signal and be input to computing machine;
Real time temperature signal Synchronization with constant temperature source is input to computing machine as the sampling benchmark simultaneously;
With computing machine the infrared energy signal of measured object and constant temperature source is carried out data processing: compose to convert the thermal map image after certain color or the briliancy to according to the size of signal;
By computing machine the constant temperature source image in the thermal map is discerned, drawn its temperature data value; The actual temperature value of this temperature data value and constant temperature source being passed to synchronously computing machine compares, and obtains its deviate, with this deviate the thermal imagery temperature data value of measured object is calibrated again.
2, the method for real-time correcting infrared measuring temperature according to claim 1 is characterized in that: the constant temperature source of described employing is the infrared emittance black-body resource identical with measured object.
3, the method for real-time correcting infrared measuring temperature according to claim 2, it is characterized in that: black-body resource is gathered the temperature data value (Tc) of its central point as standard for manual sampling, obtain black-body resource center thermal imagery temperature data value (Tc ') by computing machine, use the side-play amount (Δ t=Tc-Tc ') of black-body resource central temperature value (Tc) and black-body resource center thermal imagery temperature data value (Tc ') that measured object thermal imagery temperature data value is calibrated again.
4, the method for real-time correcting infrared measuring temperature according to claim 2, it is characterized in that: black-body resource is gathered its center temperature value (Tc) and 2 temperature values of skin temperature value (Ts) as standard for manual sampling, obtain black-body resource center thermal imagery temperature data value (Tc ') and shell thermal imagery temperature data value (Ts ') by computing machine, use the temperature drift rate that obtains by above-mentioned data [k=(Tc-Ts)/(Tc '-Ts ')] that the each point temperature data value of measured object thermal imagery is calibrated again.
5, a kind of device of real-time correcting infrared measuring temperature, be provided with the infrared camera (5) that is used to gather measured object (3) infrared energy signal, described infrared camera is electrically connected with data handling machine (6), it is characterized in that: be provided with measured object (3) on same data acquisition face and the infrared emittance constant temperature source (2) identical with measured object, the temperature signal output terminal of constant temperature source is connected with described computing machine.
6, the device of a kind of real-time correcting infrared measuring temperature according to claim 1 is characterized in that: described constant temperature source (2) is the infrared emittance black-body resource identical with measured object.
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