JPS61196130A - Temperature measuring apparatus - Google Patents

Abstract

PURPOSE:To enable the measurement of a temperature distribution and a temperature value of an object to be measured, by making a temperature distribution measured with a thermoelectric type infrared camera correspond to the temperature value of an object being measured to specify a specified position of the temperature distribution on a monitor image with a cursor. CONSTITUTION:A cursor vertical to a monitor 300 is displayed according to the specifi cation by a joy stick 205 at a measuring position setting section 2. An output signal 508 and a video signal 500 of a spot display circuit 100 at an image section 1 are inputted into an image synthesization circuit 200 and the temperature distribution is displayed on the monitor 300 together with an image of an object. A temperature measuring section 3 is added to this circuit system already developed to make the temperature measurement quantitative. Then, a temperature measuring joy stick 301 is operated to input a horizontal-wise address signal into a ROM 305 through an A/D converter 303 or the like. The relationship between the temperature distribution measured or calibrated beforehand and temperature is memorized into the ROM 305 and a temperature signal 509 corresponding to an address on a screen corresponding to the horizontal-wise size of the temperature distribution is inputted into a numerical display controller 306 and the temperature value is displayed on the monitor 300.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to temperature measurement of an infrared television camera using a thermoelectric infrared sensor and display of the results.

[Background of the invention]

An infrared camera that measures temperature by detecting infrared rays emitted from objects has been developed (Electronic Materials Vol.

19 Nα9 (September 1980, p. 98). It was not possible for this camera to measure the temperature distribution of the object to be measured, or to know what the temperature was. In other words, only qualitative judgments such as which parts are hot or cold could be obtained. On the other hand, devices that use thermoelectric infrared sensors to visualize temperature distribution and temperature values have also been developed, but these devices have the drawbacks of requiring cooling and being bulky.

[Purpose of the invention]

In order to solve the above problems, the present invention eliminates the need for cooling.
The present invention provides a device that can measure the temperature distribution and temperature value of a measurement target.

[Summary of the invention]

In order to achieve the above object, the present invention associates the temperature distribution measured by a thermoelectric infrared camera with the temperature value of the measurement target, and specifies a desired position in the temperature distribution displayed as a monitor image using a cursor. Then, the corresponding temperature will be displayed on the monitor screen.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 shows a circuit block for measuring temperature distribution and temperature values on the distribution using information from an infrared camera.

The apparatus of the present invention includes an image section 1 that displays the heat distribution of a target object on a monitor, a measurement position setting section 2 that specifies the position of the temperature distribution in the vertical direction of the displayed image, and a measurement position setting section 2 that specifies the position of the temperature distribution in the vertical direction of the displayed image. It consists of a temperature measuring section 3 that calculates and displays the temperature.

The image section 1 and the measurement position setting section 2 are conventional.

Although it has already been developed, the present invention aims at visualization and quantification of temperature measurement by newly adding a temperature measurement section 3. First, the one-image section 1 and the measurement position setting section 2 will be briefly explained.

The video signal 500 from the infrared camera 10 is transmitted through an amplifier 11,
The signal passes through a sample hold 12 and an analog-to-digital converter (hereinafter referred to as an A/D converter) 13 and is stored in a memory 14 . When the measurement position designation joystick 205 is operated, the output changes depending on the movement of Y, but is digitized through the amplifier 206 and A/D converter 207 and sent to the comparator 208 as a 1-position designation signal 505. On the other hand, the video signal 500 is separated into a horizontal synchronizing pulse signal 501 and a vertical synchronizing pulse signal 502 by a synchronizing separation circuit 201, and sent to counters 202 and 204, respectively. The counter 204 counts clock pulses from the clock circuit 203 and sequentially sends a timing pulse signal 506 to the comparator 208. When the position designation signal 505 and the timing pulse signal 506 match, the comparator 2
08 is sent to the cursor controller 209 as a horizontal direction address signal 504 for the monitor screen. Therefore,
A vertical cursor line is displayed on the monitor 300 in accordance with the designation of the joystick 205. Further, the vertical address signal 503 from the counter 202 and the horizontal address signal 504 are sent to the memory 14, and the horizontal
An image memory signal 507 corresponding to the vertical address is sent to the spot display circuit 100. This circuit places a spot at a position corresponding to its size, that is, according to its temperature, and displays it as a temperature distribution. That is,
The output signal 508 of the spot display circuit 100 and the video signal 500 are input to the image synthesis circuit 200, and the temperature distribution is displayed on the monitor 300 together with the target image. Although the above circuit system can obtain the temperature distribution of a specified object on the monitor screen, it cannot measure the temperature of the object. A circuit section to which a measurement function is added is a temperature measurement section 3. Joystick 3 for temperature measurement
01, the amplifier 302. A/D converter 303 and counter 30
4, and send the monitor screen/horizontal address signal to R.
Input to OM305. The relationship between the temperature distribution and the temperature, which has been measured or modified in advance, is input into the ROM 305.

That is, the temperature signal 509 corresponding to the address on the monitor screen corresponding to the horizontal size of the temperature distribution is input to the numerical display controller, and the temperature value is displayed on the screen of the monitor 300.

FIG. 2 shows an example of displaying temperature measurement values according to the present invention.

First, the measurement position specifying joystick 205 is operated to move the cursor 401 to a target location on the target object 400 displayed on the screen of the monitor 300 .

At this time, the temperature distribution on the cursor 401 is displayed as 403. Next, the temperature measurement joystick 301
is operated to move the second cursor 402 in the horizontal direction and set it to a desired wave height position of the temperature distribution 403. The temperature corresponding to this set position (the intersection of the temperature distribution 403 and the cursor 402) is displayed as a digital temperature value 404. Therefore, it is possible to measure the temperature of an object appearing on the monitor screen by operating the two cursors.

FIG. 3 is an example of measurement results showing the relationship between the horizontal address on the monitor screen and the surface temperature of an object.

In the present invention, as an example, one scanning line on a monitor screen is 512
It is divided equally. Therefore, if this data is input into the ROM 305, the temperature corresponding to the horizontal position of the monitor screen indicated by the cursor 402 can be found.

However, when using the infrared camera 10, it depends on the emissivity (hereinafter expressed as ε) of the object to be measured.

Calculate the temperature change due to the change in ε.

The energy W (T) radiated from a gray body is expressed as W (T) = εσT' (1) from the Stefan-Boltzmann law. Here, σ is the Stefan-Boltzmann constant and T is its absolute temperature. Now, the environmental temperature is T1,
When the incidence efficiency of the infrared camera 10 is k, the energy R (T, T,) incident on the camera 10 is expressed as follows from equation (1).

R(T,T,)=k i σT'+k(1-ε)σT
&' (2) Therefore, the following relationship holds true.

As an example, when T=200°C and T=40°C.

The temperature change ΔT when the measurement data is processed assuming that the emissivity ε is 0.8 is 0.7 is approximately 6 from equation (3).
℃, which can be estimated within 3%. This value varies depending on the temperature T and emissivity ε of the target object, but when measuring the surface temperature of plant equipment, the emissivity is known in advance, so the measurement accuracy can be further improved.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to measure the distribution of surface temperature of an object and its temperature value using an infrared camera, so it is particularly effective for remote equipment diagnosis such as searching for heat generation location 1 of equipment.

Furthermore, since cooling is not required, the device has the advantage of being able to be made smaller.

[Brief explanation of drawings]

Figure 1 is a circuit block diagram for measuring temperature distribution and temperature values on the distribution using information from an infrared camera; Figure 2 is a diagram showing an example of displaying temperature measurement values according to the present invention;
The figure is a diagram showing an example of a measurement result showing the relationship between the horizontal address of the monitor screen and the surface temperature of an object. DESCRIPTION OF SYMBOLS 10... Infrared camera, 100... Spot display circuit, 200... Image composition circuit, 205... Joystick for measurement position specification, 209... Cursor controller, 300... Monitor, 301... Joystick for temperature measurement, 305...ROM, 306...
Character display controller.

Claims (1)

[Claims] 1. In an infrared camera system equipped with an image section for displaying the temperature distribution of the measurement target on a monitor TV and a setting section for specifying the position of the temperature distribution, the horizontal direction address of the monitor screen corresponding to the size of the temperature distribution and the A temperature measuring device characterized in that a relationship with a temperature value of an object surface is stored in a computer memory, and a temperature value at a desired position on the temperature distribution specified by the setting section is displayed on the monitor television.