JPH0593655A - Infrared temperature analyzer - Google Patents

Abstract

(57) [Abstract] [Purpose] An infrared temperature analysis device that can perform high-precision temperature calibration under measurement conditions in a short time, and that can eliminate temperature variations in the characteristics of the equipment and the effects of changes in characteristics over time. obtain. [Structure] The heat conducting material 26 and the heater 27 are combined, and the heat conducting material 26 is provided with two or more temperature sensors 28 and 29 to form a temperature source. By heating the heat conducting material 26 with the heater 27, a linear heat gradient is generated in the heat conducting material 26 from high temperature to low temperature. Temperature sensors 28 and 29 are on the low temperature side P
The temperature measuring devices 24 and 25 measure the respective temperatures T1 and T2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to temperature calibration of an infrared temperature analyzing device for taking an infrared image of a subject with an infrared camera and measuring the temperature of each part of the subject.

[0002]

2. Description of the Related Art FIG. 4 shows an example of temperature calibration of a conventional infrared temperature analyzer. In FIG. 4, 1 is an infrared sensor that detects infrared rays emitted from a subject and outputs an electric signal, 2 is an A / D converter that converts the analog signal output from the infrared sensor 1 into a digital video signal and outputs the digital video signal,
Reference numeral 3 denotes a frame memory for storing the digital video signal output of the A / D converter 2 for each pixel constituting the screen, and 4 for converting the digital video signal output from the frame memory 3 into an analog video signal and outputting it. / A converter,
Reference numeral 5 is a monitor for displaying an image of the analog video signal output from the D / A converter 4, and 6 is a cursor operation unit for a measuring staff to move a cursor such as a cross cursor which is simultaneously displayed on the monitor 5 on the screen. , 7 are cursor operation units 6
The coordinate storage unit for storing the position of the cursor moved and operated on the screen, 8 is a dot plane memory for writing and storing the cursor pattern at the cursor position coordinates output from the coordinate storage unit 7, and 9 is the coordinates of the coordinate storage unit 7. The designated coordinate data reading section 10 for selectively outputting the data of the digital video signal of the frame memory 3 at the position corresponding to 10 is a gradation for outputting the temperature corresponding to the gradation of the digital video signal from the designated coordinate data reading section 9. A temperature-to-temperature converter 11, a condition setting unit for a measuring person to set measurement conditions such as lens type and diaphragm, and 12 stores various gradation-to-temperature correction data corresponding to various combinations of conditions. The correction data memory 13 is a black body temperature source for measuring the gradation-temperature correction data in advance.

Next, the operation will be described. The infrared sensor 1 outputs an electric signal of gradation corresponding to the intensity of infrared energy incident from a subject. The electric signals are sequentially output from the infrared sensor 1 in a time series by scanning the television, and
The signal is analog-to-digital converted by the / D converter 2 and stored as a digital video signal in the frame memory 3 which stores each pixel constituting the screen. The contents of the frame memory 3 are sequentially read out in time series by TV scanning along with the contents of a dot plane memory 8 to be described later, and D /
An analog video signal is converted by the A converter 4, and the monitor 5
The image of the subject and the cursor are displayed at the same time.

The cursor operation unit 6 is an operation unit for moving the cursor displayed on the screen to the portion where the temperature of the image of the subject imaged on the monitor is desired to be measured while watching the image on the monitor 5. .. When the cursor is operated in the vertical and horizontal directions using the cursor operation unit 6, the vertical and horizontal coordinates of the position corresponding to the movement of the cursor are stored in the coordinate storage unit 7. One of the outputs of the coordinate storage unit 7 is added to the dot plane memory 8, the cursor pattern is written to the location of the designated coordinate of the dot plane memory 8 arranged corresponding to the pixels forming the screen, and the output of the dot plane memory 8 is the above-mentioned. As described above, the signals are sequentially read by television scanning, converted into analog video signals by the D / A converter 4 together with the output of the frame memory 3, and the cursor is displayed on the monitor 5 at the same time as the image of the subject. The other output of the coordinate storage unit 7 is input to the designated coordinate data reading unit 9, and the designated coordinate data reading unit 9 receives the data of the coordinate designated by the cursor from the digital video signal separately input from the frame memory 3 described above. Select and output only.

The digital video data selected by the designated coordinate data reading section 9 is added to the gradation-to-temperature converting section 10. On the other hand, the measurement condition setting unit 11 is a unit for setting measurement conditions such as a lens type and an aperture by a measurer, and the set conditions are added to the correction data memory 12 to select the relationship between gradation and temperature. .. In the correction data memory 12, the relationship between the gradation and the temperature is measured by changing the temperature of the black body temperature source 13 in advance in the factory according to the combination of various conditions, and the relationship between the gradation and the temperature for each combination of various conditions is measured. Remembered The relationship between gradation and temperature in the correction data memory 12 is selected according to the condition set by the condition setting unit 11 described above, and this data is written in the gradation-temperature conversion unit 10 described above. Therefore, the video data output of the coordinates designated by the cursor by the designated coordinate data reading unit 9 is converted to a temperature corresponding to the gradation of the video data by the gradation-to-temperature conversion unit 10 and output. Although this output is not shown in FIG. 4, it is displayed numerically on a monitor or the like.

[0006]

Since the conventional apparatus is constructed as described above and uses the black body temperature source as the temperature calibration source, if the black body temperature is finely calibrated within the measurement temperature range. You must either calibrate the source by sequentially changing the temperature, or prepare a number of blackbody temperature sources and calibrate. Therefore, the calibration under the measurement condition at the measurement place before the measurement takes a long time or is unpractical because the calibration device becomes large. There was a need.

Further, in the conventional apparatus, the relationship between the gradation and the temperature was calibrated in advance at the factory for each measurement condition, and a large amount of data was stored in the apparatus. Therefore, the calibration before the measurement at the measurement location cannot be performed. , It cannot be calibrated under each appropriate measurement condition. Moreover, the calibration could not be said to be accurate because it was not possible to cope with changes in the characteristics of the device over time. Further, there is a problem that calibration data is prepared for each device due to variations in device characteristics.

The present invention has been made to solve the above problems, and is suitable for a temperature source that provides a continuous temperature source from a high temperature to a low temperature within a measurement temperature range and a measurement location. An object of the present invention is to obtain an infrared temperature analysis device that can perform temperature calibration under measurement conditions and can perform high-precision temperature calibration that is compatible with variations in equipment and changes in the characteristics of the equipment over time.

[0009]

In addition to the above-mentioned conventional apparatus, an infrared temperature analyzing apparatus according to the present invention uses a heat conducting material and a heating apparatus for the heat conducting material in place of the black body temperature source to conduct heat conduction of the heat conducting material. It uses a temperature calibration source that simultaneously obtains a continuous temperature source from the high temperature to the low temperature of the temperature measurement range by utilizing the thermal gradient in the inside.

An infrared temperature analyzing apparatus according to another invention of the present invention is provided with two or more temperature sensors in the heat conducting material, and the relationship between the temperature and the gradation temperature based on the video data of the heat conducting material in the apparatus. It is provided with a gradation-versus-temperature calculation unit for obtaining

[0011]

In the present invention, the heat conducting material is heated by the heating device for the heat conducting material, and the temperature gradient is used continuously from the high temperature to the low temperature of the temperature measuring range by utilizing the thermal gradient during the heat conduction of the heat conducting material. With this, one calibration device can simultaneously calibrate from high temperature to low temperature.

Further, a temperature sensor measures two or more temperatures of the heat conductive material, and a gradation-to-temperature calculation unit uses the temperature of the heat conductive material and the image data of the heat conductive material to obtain a relationship between the gradation and the temperature. Ask for.

[0013]

【Example】

Example 1. FIG. 1 (a) shows an embodiment of the temperature calibration source of the present invention, and 2a is a heat conducting material for generating a thermal gradient by heat conduction to generate infrared rays having a continuous temperature change. Reference numeral 27 is a heater for heating one side of the heat conductive material 26, and 24 and 25 are temperature measuring devices. 28
And 29 are temperature sensors.

FIG. 1 (b) is a graph showing the temperature of each part of the heat conducting material. The heat heated by the heater 27 conducts the heat conducting material 26 from the heating side to the opposite side, and A linear thermal gradient is generated in the conductive material 26 from high temperature to low temperature according to the Fourier law as shown in the graph. The temperature sensors 28 and 29 are located on the low temperature side P1 and the high temperature side P2.
The temperature measuring devices 24 and 25 measure the respective temperatures T1 and T2. By measuring T1 and T2, the intermediate temperature can be calculated by the coefficient of thermal gradient.
The protrusions provided at the positions of the heat conductive material 26 are marks for indicating the positions of P1 and P2 on the image when the heat conductive material is imaged. In the present invention, the heat conducting material 26 is made of a material having a rough surface and a dark color so as to efficiently emit infrared rays, have no directivity, and have little wavelength dependence.

FIG. 2 shows a monitor image when the thermal gradient temperature source of the present invention is used for temperature calibration.
Reference numeral 30 is a monitor screen, 31 is an image of the thermally conductive material 26 of the thermal gradient temperature source, and 32 and 33 are simultaneously displayed cursors. The cursors 32 and 33 are aligned with the positions P1 and P2 of the two temperature sensors 28 and 29 of the thermal conductive material 26 of the thermal gradient temperature source by a cursor operating unit described later, so that coordinates P1 (X1 of P1 and P2 on the screen are displayed. , Y
1) and P2 (X2, Y2) are calculated. At this time, the protrusion of the heat conductive material 26 is attached to confirm the positions of the temperature sensors 28 and 29. If the position can be confirmed from the shape, the same effect can be obtained even if it is not a protrusion.

FIG. 3 shows an example of an infrared temperature analyzing device for temperature calibration using the above-mentioned thermal gradient temperature source. In FIG. 3, 1 to 10 are exactly the same as the conventional device. 14
Are temperature sensors 28 and 29 provided on the heat conductive material 26.
The gradation-to-temperature calculation unit 15, which obtains the relationship between gradation and temperature from the temperature measured in step S and the video data of the heat conductive material 26,
Positions of the temperature sensors 28 and 29 shown in the monitor image of FIG. 2 and an n-point coordinate calculation for calculating coordinates of each point obtained by dividing the straight line connecting the coordinates of P1 (X1, Y1) and P2 (X2, Y2) into n equal parts. And 16 are temperature measuring devices 24 and 2 of the thermal gradient temperature source.
Measurement points P1 (X1, Y1) and P2 (X
(2, Y2) the temperature setting unit for setting the temperatures T1 and T2, 17 receives the temperatures T1 and T2 set by the temperature setting unit 16, and from the measurement point P1 (X1, Y1) to the measurement point P2 ( X2, Y2) is divided into n equal parts and the temperature of each point is calculated by an n-point temperature calculation unit 18, and the temperature data from the n-point temperature calculation unit 17 and n from the designated coordinate data reading unit 9 are separately calculated.
A memory that stores the digital video data selected at the coordinates of n points calculated by the point coordinate calculation unit 15 in association with each other,
Reference numeral 19 is an interpolation calculator for interpolating the temperature between each of the n points evenly divided and for each gradation. Reference numerals 20, 21, and 22 are mode changeover switches for temperature calibration and measurement, and the a side indicates the time of temperature calibration. .. Reference numeral 23 is a heat gradient temperature source including the heat conducting material 26 and the heater 27 shown in FIG.

Next, the operation of the embodiment of the present invention will be described with reference to FIG. 1 to 5 are similar to the operation of the conventional device. In the apparatus of the present invention, when the temperature of the subject is automatically calibrated before measuring the temperature, when the thermal gradient temperature source 23 is imaged by the infrared sensor 1, the monitor 5 is provided with a thermal conductive material of the thermal gradient temperature source and a thermal conductive material as shown in FIG. The cursor is displayed. When the cursor operation unit 6 operates two cursors in the vertical and horizontal directions, the vertical and horizontal coordinates of each cursor are sequentially stored in the coordinate storage unit 7, and the coordinates are output to correspond to the coordinates in the dot plane memory 8. The cursor pattern is written at the position. The output of the dot plane memory 8 is sequentially read out by television scanning, enters the D / A converter 4 together with the digital video data from the frame memory 3, is digital-analog converted, and is sent to the monitor 5 as analog video data. As shown in FIG. 2, the image of the heat conductive material and the cursor are displayed at the same time.

While looking at this screen, the two cursors are moved to the positions P1 (X1, Y1) and P2 (X2, Y) of the temperature sensors.
The above-mentioned cursor operating unit 6 is operated so as to become 2).
At this point, the n-point coordinate calculation unit 15 operates and P1 (X1,
The coordinates between the coordinates Y1) and P2 (X2, Y2) are equally divided into n, and the coordinates are sequentially sent to the designated coordinate data reading unit 9. The designated coordinate data reading unit 9 selects the video data of the coordinate points of n points sent from the n point coordinate calculating unit 15 from the digital video data input from the frame memory 4 separately and stores it in the memory 18. .. Temperature setting unit 16
Is for setting the data obtained by measuring the temperatures of P1 and P2 of the thermal gradient temperature source with the temperature measuring devices 24 and 25. The n-point temperature calculation unit 17 uses the thermal gradient temperature sources P1 and P.
The temperature at each point obtained by equally dividing n between 2 is calculated by a linear equation. n
The temperature of each point calculated by the point temperature calculation unit 17 is stored in the memory 18 corresponding to the above-mentioned video data. The interpolation calculation unit 19 further performs an interpolation calculation of the temperature vs. video data of n points stored in the memory 18 for each gradation of the video data.

The relationship between the gradation and the temperature of the video data calculated as described above is stored in the gradation-to-temperature converter 10 by the interpolation calculator 19. The gradation-to-temperature conversion unit 10 is a unit for converting the gradation of video data into temperature, using a random access memory as an example, and storing the temperature in the memory of the corresponding address by using the gradation as an address. The temperature can be efficiently converted to the temperature corresponding to the gradation of the video data.

Next, the operation in the measurement mode will be described. In the measurement mode, the switches 20, 21, and 22 select the side b, which is opposite to the side shown. The infrared sensor 1 images the subject whose temperature is to be measured. While looking at the screen imaged on the monitor 5, the measurer positions the cursor on the monitor 5 with the cursor operation unit 6 at the place where the temperature is desired to be measured. In accordance with the operation of the cursor operation unit 6, the coordinates X and Y are given from the coordinate storage unit 7 to the designated coordinate data reading unit 9 through b of the switch 20, and the designated coordinate data reading unit 9 sequentially reads the coordinates from the frame memory 3 separately. Digital video data of coordinates X and Y is selected from the digital video data of the subject to be recorded, and is applied to the gradation-to-temperature conversion unit 10 through the switch 21b side and the switch 22b.

The gradation-to-temperature converter 10 outputs the temperature corresponding to the gradation of this digital video data. The output of this temperature is displayed on the monitor 5 as characters through a path not shown in the figure. With such a configuration, the infrared temperature analyzing apparatus of the present invention automatically calibrates the apparatus with high accuracy under the measurement conditions such as the type of lens used and the diaphragm, and after the calibration, automatically converts the video data of the subject into temperature. To do.

[0022]

As described above, according to the present invention, if a heat conducting material and a heating device for the heat conducting material are used and the thermal gradient during heat conduction of the heat conducting material is used as a temperature constituent source, it is possible to obtain a low temperature. It is possible to obtain a continuous temperature source up to a high temperature and to obtain highly accurate calibration in a short time.

Further, the heat conducting material is provided with temperature sensors at two or more places, and a tone-versus-temperature calculating section for determining a tone-temperature relation from temperature and video data of the heat-conducting agent is added in the apparatus. As a result, the calibration work can be automated, and highly accurate calibration can be performed under various measurement conditions before measurement at the measurement site, and variations in the characteristics of the device and the effects of changes over time in the characteristics can be eliminated.

[Brief description of drawings]

FIG. 1 is a diagram showing a temperature calibration source according to an embodiment of the present invention.

FIG. 2 is a diagram showing a monitor image during calibration according to the present invention.

FIG. 3 is a diagram showing an infrared temperature analyzing apparatus according to an embodiment of the present invention.

FIG. 4 is a diagram showing a conventional infrared temperature analysis device.

[Explanation of symbols]

 1 Infrared Sensor 2 A / D Converter 3 Frame Memory 4 D / A Converter 5 Monitor 6 Cursor Operation Section 7 Coordinate Storage Section 8 Dot Plane Memory 9 Specified Coordinate Data Read Section 10 Gradation-to-Temperature Conversion Section 11 Condition Setting Section 12 Correction data memory 13 Blackbody temperature source 14 Gradation-to-temperature calculation unit 15 n-point coordinate calculation unit 16 Temperature setting unit 17 n-point temperature calculation unit 18 Memory 19 Interpolation calculation unit 20 Switch 21 Switch 22 Switch 23 Thermal gradient temperature source 24 Temperature Measuring device 25 Temperature measuring device 26 Thermal conductive material 27 Heater 28 Temperature sensor 29 Temperature sensor 30 Monitor screen 31 Image of thermal conductive material 32 Cursor 33 Cursor

Claims (2)

[Claims] 1. An infrared temperature analyzing device for taking an infrared image of a subject with an infrared camera and measuring the temperature of each part of the subject from a video signal. An infrared temperature analysis device is characterized in that the thermal gradient of the heat conducting material during heat conduction is used as a temperature calibration source. 2. A thermal conductive material is provided with temperature sensors at two or more locations, and a gradation-to-temperature calculation unit for obtaining a gradation-to-temperature relationship from temperature and imaging video data of the thermal-conductive material is provided in the apparatus. The infrared temperature analysis device according to claim 1, characterized in that