JPS61290329A - Head for infrared thermometer - Google Patents

Abstract

PURPOSE:To enable increase in the number of measuring points for measuring temperature simultaneously, by arranging a plurality of optical fibers at the position where transmission light of one less is received with other ends of the optical fibers facing a infrared sensor separately. CONSTITUTION:One lens 20 is arranged between measuring points and three optical fibers F1-F3. An image is formed at the end face of the optical fiber F1 for the measuring point S1 through the lens 20, on the end face of the optical fiber F2 for the measuring point S2 and on the end face of the optical fiber F3 for the measuring point S3. An infrared sensor is provided at the other ends of the optical fibers F1-F3 and lights from the measuring points enter the sensor to detect the temperature on the basis of the output signal thereof. The number of measuring points can be increased with the same head for an infrared thermometer by increasing the number of optical fibers installed with the occupation calibre of the lens 20 unchanged.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an infrared thermometer head.

[Prior Art] There is an infrared thermometer that can simultaneously measure multiple points on an object 111 using infrared rays, and an example of a head used in this thermometer is shown in FIG.

In this example, the measurement points Sl, S2. Three lenses 11, 12.degree. 13 are arranged facing S3, respectively, and optical fibers Fl, F2. F3 is installed. On the imaging planes of the lenses 11 to 13, optical fibers F1 to
The end face of F3 is arranged.

One infrared sensor (not shown) is provided at each other end of the optical fibers F1 to F3, and the temperature at each measurement point 81 to S3 is detected according to the output of these infrared sensors.

By the way, according to the above-mentioned conventional example, the same number of lenses as the number of points whose temperature is to be measured simultaneously are required. In this case, if the diameter of the head is determined, there is a limit to the number of lenses that can be accommodated, and therefore there is a problem in that there is a limit to the points at which temperature can be measured simultaneously.

[Purpose of the Invention] The present invention has been made by focusing on the problems of the conventional art described in L. In an infrared thermometer head that can simultaneously measure the temperature at a plurality of measurement points, it is possible to reduce the number of measurement points. It is an object of the present invention to provide an infrared thermometer head that can increase the number of infrared thermometers.

[Embodiment of the Invention] FIG. 1 is a diagram showing an embodiment of the present invention. It should be noted that the same members as those in the conventional example shown in FIG.

In this embodiment, only one lens is installed between the measurement point and three optical fibers. In other words, the measurement point 31 of the object to be measured. S2. S3 and optical fiber/<Fl, F2
．． One lens 20 is provided between F3 and F3.

Next, the operation of the above embodiment will be explained.

Via the lens 20, the measurement point Sl is imaged on the end face of the optical fiber F1, the measurement point S2 is imaged on the end face of the optical fiber F2, and the measurement point S3 is imaged on the end face of the optical fiber F3. An infrared sensor is provided at the other ends of the optical fibers F1 to F3, and the imaged light is transmitted to the optical fibers Fl, F2 . F3 is directed to each infrared sensor, and the temperature is detected based on this output signal.

In this case, the number of installed optical fibers can be increased while keeping the aperture occupied by the lens 20 the same. therefore,
The number of measurement points can be increased in the same infrared thermometer head. Also, what about the size of the head and the lens? If the aperture is approximately the same as the aperture of the lens 20, it is possible to set the same number of measurement points as the number of optical fibers that can be accommodated within the aperture of the lens 20.

Therefore, it is possible to keep the temperature distribution Δ constant more closely than in the past.

Note that the installation position l of the optical fiber can also be made wider than the position shown in FIG. ff11. That is, an optical fiber may be installed at a position that receives transmitted light from the lens 20, or two or four or more optical fibers may be installed for one lens.

[Effects of the Invention] According to the present invention, there is an effect that the number of measurement points can be increased in an infrared thermometer head that simultaneously measures temperatures at a plurality of measurement points.

[Brief explanation of the drawing]

FIG. 1 is a diagram of an infrared thermometer head showing an embodiment of the present invention. FIG. 2 is a diagram showing a conventional infrared thermometer head. 20...Lens, 31.32, S3...Measurement point. Fl, F2. F3...optical fiber. Figure 1

Claims (2)

[Claims] (1) An infrared thermometer head comprising: one lens; and a plurality of optical fibers provided at positions that receive transmitted light from the lens. (2) The head for an infrared thermometer according to claim 1, wherein the other end of each of the optical fibers faces an infrared sensor.