JPS5912324A - Heat detecting method - Google Patents

Abstract

PURPOSE:To facilitate the comparison of the temperature of a material to be measured and the temperature of a temperature reference body, by simultaneously displaying the heat radiation pattern from the material to be measured and the optical patterns of the reference temperature from the temperature reference body on the same screen. CONSTITUTION:The heat radiation patterns from a material to be measured 1 and a temperature reference body 3 are transmitted by image guides 6 and 10, and displayed on a detecting screen 5. At this time, the heat radiation pattern 2 from the material to be measured 1 and optical patterns 4 of the reference temperature from the temperature reference body 3 are simultaneously displayed on the same screen 5. Then, the densities and colors of both patterns 2 and 4 are compared with each other, and the magnitude of the temperature is detected.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat detection method suitable for detecting the absolute temperature of heat or the like.

For conventional detection? j nowi d. As shown in Figure 1, one end I3 of the image guide A that enables direct image transmission is placed near the high temperature furnace C where images need to be detected, and this image guide detects the infrared heat pattern from the high temperature furnace. The received light is transmitted to a location suitable for temperature detection, and this infrared heat pattern is detected by the detection device D of the right camera of the infrared TV L7, and the output signal of this detection device is processed as an image signal by the calculation device E to be displayed on a monitor TV, etc. A pseudo color pattern is displayed on F.

According to this method, the detected temperature distribution is expressed by the shading of the image detected by the infrared television camera, that is, by the signal voltage level corresponding to each pixel of the infrared television camera. However, although image detection devices such as infrared television cameras are generally capable of measuring relative brightness distributions, that is, temperature differences, the degree of accuracy is not always sufficient, and the relative temperature distribution is not always sufficient. Measurement was almost impossible due to fluctuations in the sensitivity of the infrared TV right camera, deterioration due to changes in red time, nonlinearity, and diversity in the measurement temperature range.

Therefore, if absolute temperature measurement is absolutely necessary, a standard blackbody furnace is prepared, and the infrared heat pattern from it and the infrared heat pattern from the object to be measured are detected alternately using the same measurement system and compared. Ta.

However, this method not only complicates the measurement but also has the disadvantage that the measurement accuracy is insufficient.

In order to solve these problems, the present invention aims to improve the thermal radiation pattern (2) from the object to be measured (as shown in FIGS. 2 and 3).
and a reference temperature light pattern (4) emitted from a temperature reference object (3) are simultaneously displayed on the same detection screen (5) so that both can be compared on the same screen (5). .

Note that two or more reference temperature light patterns (4) having different temperatures may be displayed on the detection screen (5).

The present invention will be described below using an example in which the thermal radiation from the object to be measured is infrared rays.

The infrared light emitted from the high temperature furnace as the object to be measured is received by an image guide (6) and transmitted to an image detection device (7) such as an infrared TV camera.
The output signal is processed by all the processing units (8) and sent to the monitor TV.
The infrared heat pattern (2) is displayed on the detection screen (5) of (9), and the infrared light emitted from the temperature reference object (3) is received by the optical fiber 0, which is reflected in the image above. The reference temperature light pattern (4) is displayed on the detection screen (5) via the detection device (7) and the calculation device (8). Both patterns (2) displayed on the same screen (5)
) and (4), it can be determined whether the heat radiated from the high temperature furnace (1) is higher, lower, or the same as the temperature of the temperature reference object (3). Detect. In addition, by changing the temperature of the temperature reference object (3), the density, color, etc. of the reference temperature light pattern (4) projected on the detection screen (5) can be changed by changing the density, color, etc. of the infrared heat pattern (2) from the object to be measured (1), By matching the colors, etc., the absolute temperature of the object to be measured (1) can be detected from the absolute temperature of the temperature reference object (3) at this time.

In Figure 1, a large number of quartz fibers arranged in a row is used as the image guide (6), and the optical fiber (10)
In this case, two quartz fibers are used.

The optical fiber (lO) can be a single core or a bundle of many optical fibers, and its material can be different from that of the image guide, but to improve detection accuracy, it is recommended to use one made of the same material. When using the same material, a part of the fiber wire of the image guide (6) may be branched in the middle and the branched portion may be used.

Also, the length of the optical fiber (10) is determined by the infrared heat pattern (2
) and the reference temperature light pattern (2) are preferably the same length as the image guide (6) to facilitate calibration.

The arithmetic unit (8) has a built-in microconbeater, and divides the video signal input from the image detection device (7) into gradations at preset voltage levels and outputs it as a color signal of a color TV signal. That's how it is.

The monitor TV (9) displays the color TV signal output from the rendering device (8) as a pseudo color pattern1. For example, a standard blackbody furnace is used as the temperature reference object (3), and the reference temperature is The temperature at the highest and lowest two points in the measurement range is taken, and the temperature between them is divided into gradations by an arithmetic unit (8) to display a pseudo color pattern. The maximum and minimum temperatures of the standard blackbody furnace can be freely selected by changing the heater current of the standard blackbody furnace.

Note that a light source such as an incandescent light bulb may be used as the temperature reference object (3).

In Figure 1, 0 is an optical system installed at the light receiving end of the image guide (6), and the barrel is an optical system that connects the image detection device (7), the image guide (6), and the optical fiber (10). .

The above explanation is for the case where the thermal pattern is an infrared image, but for temperature measurement using thermal radiation, visible light,
This can also be applied to ultraviolet light. These light beams are generally used for higher temperature measurements, and therefore the various detection devices used are either for visible light or for extra-visual light.

The present invention simultaneously displays the heat radiation pattern (2) from the object to be measured (1) and the reference temperature light pattern (4) from the temperature reference object (3) on the same screen as shown diagonally above. Therefore, by comparing the shading, color, etc. of both patterns, it is possible to detect at a glance whether the temperature of the object to be measured is higher, lower, or the same as the temperature of the temperature reference object.

Also, by changing the temperature of the temperature reference object (3), it is possible to match the density, color, etc. of the reference temperature light pattern (4) to those of the heat radiation pattern (2) from the object to be measured. The absolute temperature of the object to be measured can also be detected from the absolute temperature of the temperature reference object (3).

Furthermore, in the present invention, the thermal radiation pattern (2) and the reference temperature light pattern (4) are transmitted through the optical fiber (10), so that the configuration of the device implementing the present invention is simple and compact, making it easy to handle. It is easy to use, and even temperature reference objects (3
) can be placed away from the image detection device (7), so the detection device (7) is not affected by heat.
Therefore, the reliability of measurement accuracy is also improved.

Further, if two or more reference temperature light patterns having different temperatures are displayed on the detection screen, the measurement accuracy of the object to be measured can be further improved.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a conventional example, FIG. 2 is an explanatory diagram of the present invention, and FIG. 3 is an explanatory diagram showing a different example of the detection screen in the present invention. (1) is the object to be measured, (2) is the thermal radiation pattern, (3) is the temperature reference object, (4) is the reference temperature light pattern, and (5) is the detection screen.

Claims (3)

[Claims] (1) The thermal radiation pattern from the object to be measured is transmitted by the image guide and displayed on the detection screen, and at the same time, the reference temperature light pattern from the temperature reference object is also displayed on this detection screen, and both patterns are displayed on the detection screen. A heat detection method that allows you to measure the temperature distribution, absolute temperature, etc. of the object being measured by comparing them on the same screen. (2) The reference temperature light pattern displayed on the detection 1 screen,
The heat detection method according to claim 1, wherein the heat radiation pattern is variable in density, color, etc. (3) Claim 1 in which a reference temperature light pattern having different temperatures is displayed on the double upper detection screen.
Heat detection method described in section.