JPH0442745Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an optical fiber type radiation thermometer.

<Prior Art> FIG. 7 shows an example of a conventional optical fiber type two-color radiation thermometer or multicolor radiation thermometer. In the figure, 71 is a light receiving section, 72 is an optical fiber, 73 is a condensing section, 74 is a rotating sector, 75 is a narrow band optical filter, 76 is a motor, 77 is a photodetector, 78 is an amplifier, and 79 is an arithmetic circuit. be. Radiant light emitted from the object to be measured is received by the light receiving section 71, and the received light is transmitted through the optical fiber 72. The transmitted light is transmitted through a narrow band optical filter 75 by a condenser 73 and condensed onto a light receiving surface of a photodetector 77 . A plurality of narrow band optical filters 75 are mounted on the rotating sector 74 rotated by a motor 76, and light having a transmission wavelength of the narrow band optical filters is transmitted to the photodetector 7.
Detected at 7. A narrow band optical filter attached to the rotating sector 74 has two filters with different transmission wavelengths of light.
A thermometer with three or more optical filters is called a two-color radiation thermometer, and a thermometer with three or more optical filters is called a polychromatic radiation thermometer. Now, the optical signal detected by the photodetector 77 is amplified by the amplifier 78, and the arithmetic circuit 7
It is converted into the temperature determined in step 9 and output.

FIG. 8 shows an example of a conventional optical fiber type monochromatic radiation thermometer. In the figure, 71~
Numbers 73, 75, 77 to 79 indicate the 7th
The numbers are the same as those shown in the figure. In FIG. 8, the emitted light from the object to be measured is received by the light receiving section 71, as in the case of FIG.
3, the light passes through a narrowband optical filter 75 and is detected by a photodetector 77. The detected optical signal is amplified by an amplifier 78, converted to a desired temperature by an arithmetic circuit 79, and output. There is only one narrowband optical filter 75, and this case is called a monochromatic radiation thermometer.

<Problems to be solved by the invention> As explained above, the conventional optical fiber type
A color (or multicolor) radiation thermometer, as shown in Fig.
This is achieved by transmitting light through an optical filter of a wavelength (or more wavelengths) and focusing it on the light receiving surface of a photodetector. This is different in configuration from the monochromatic radiation thermometer shown in Figure 8, so the monochromatic radiation thermometer, which has a simple configuration, cannot be used as a two-color (or multicolor) radiation thermometer, and each must be configured separately. It is uneconomical to do so.

<Means for solving the problems> In order to solve these problems, the present invention
A large number of optical fiber radiation thermometer sensor probes are bundled together to form one two-color (or multicolor) radiation thermometer sensor probe.

The present invention will be described below with reference to examples.

<Embodiment> FIG. 1 is a configuration diagram of an embodiment of a sensor probe of an optical fiber radiation thermometer according to the present invention. In the figure, A to D are gradient index lenses, and A, B
is used as a light receiving section, and C and D are used as lenses of a condensing section. Further, in the figure, 1 is a lens holder, and 2 and 3 are optical fibers. The gradient index lenses A and B are bundled in parallel by a lens holder 1 and connected to condensing parts C and D via optical fibers 2 and 3, respectively.

FIG. 2 shows the measurement field of the radiation thermometer when the sensor probe of FIG. 1 is used. As shown in Figure 2, since the diameters of the two gradient index lenses A and B that make up the light receiving section are small,
When these two lenses A and B are bundled in parallel,
Since the measurement fields of view A and B overlap in almost the same range, the two emitted lights from these two lenses are divided into two.
It can be used as two-wavelength synchrotron radiation for a color radiation thermometer. For example, by adopting the configuration shown in FIG. 3, a two-color radiation thermometer can be obtained. In FIG. 3, 31, 32 are narrow band optical filters, 33,
34 is a photodetector, 35 is an amplifier, and 36 is an arithmetic circuit. In the figure, synchrotron radiation emitted from the measurement object is received by gradient index lenses A and B, transmitted through optical fibers 2 and 3, and transmitted to gradient index lenses C and D, respectively. The light is focused on the light receiving surfaces of photodetectors 33 and 34 through narrow band optical filters 31 and 32. This focused light is converted into an electrical signal by the photodetectors 33 and 34, and then added to the amplifier 35 and amplified.
is converted to temperature and output. Instead of the sensor probe shown in FIGS. 1 and 3, the sensor probe may be connected to the temperature converter 40 via optical connectors 41 and 42 as shown in FIG. 4.

Figures 5a, b, and c show examples of sensor probes for multicolor radiation thermometers. FIG. 5a shows an example of a sensor probe for a three-color radiation thermometer, in which three graded index lenses to which optical fibers are connected are bundled at a light receiving section 51. FIG. 5b shows an example of a sensor probe for a four-color radiation thermometer, in which four graded index lenses to which optical fibers are connected are bundled in a light receiving section 52. In the examples shown in FIGS. 5a and 5b, the configuration may be such that an optical connector is relayed as in the example shown in FIG. 4 in the sensor probe for a two-color radiation thermometer. Figure 5c
is an example of using a plurality of optical fibers bundled at the light receiving part 53 as a sensor probe,
The light condensing portion is condensed by lenses 55, 56, and 57. 54 in FIG. 5c is an optical fiber holder.

By using the sensor probes shown in Figures 1, 4, and 5 a, b, and c, monochromatic radiation thermometers and two-color (and multicolor) radiation thermometers can be handled in a unified manner. can. For example, FIG. 6 shows an example of the configuration. In FIG. 6, 61a and 61b are sensor probes, 62 is a condensing lens system, 63 is a narrow band optical filter, 64 is a photodetector, 65 is an amplifier, and 66
is an analog/digital converter, 67 is a computer, and 68 is a signal converter. The synchrotron radiation emitted from the object to be measured is transmitted to the sensor probes 61a and 61.
b, the light is received by a condensing lens system 62, a narrowband optical filter 63, a photodetector 64, an amplifier 65,
It is converted into a digital signal via an analog/digital converter 66. The measurement data converted into digital signals is taken into the computer 67 via the data bus, and an appropriate calculation method is selected and executed depending on the case of a monochromatic radiation thermometer or a two-color (multicolor) radiation thermometer. Output. As shown in FIG. 6, the computer 67 includes a signal converter 6.
8 can be arbitrarily connected as needed. As described above, according to the present invention, as described in the conventional example, it is not necessary to separately configure a two-color (multicolor) radiation thermometer and a monochromatic radiation thermometer as shown in FIGS. 7 and 8. For example, as shown in Figure 6, a sensor probe for a monochromatic radiation thermometer and a two-color (multicolor)
Once the sensor probe for the radiation thermometer is prepared, all that is required is the same signal converter 68 and one computer 6.
By using 7 and 2 respectively
A color (multicolor) radiation thermometer can be constructed.

<Effects of the invention> Conventionally, a monochromatic radiation thermometer and a two-color (multicolor) radiation thermometer had to be configured separately, but in the present invention, the a,
As shown in b and c, a plurality of sensor probes are bundled to form a sensor probe for a two-color (multicolor) radiation thermometer, so for example, as shown in FIG. A monochromatic radiation thermometer and 2
It can be configured without distinction from a color (multicolor) radiation thermometer.
Moreover, by connecting these signal converters to a single computer, a radiation thermometer system can be constructed in which the calculation method can be freely selected depending on the situation. Furthermore, when using the sensor probe according to the present invention, the measurement field of view is as shown in Fig. 2, since two (or more) fields of view in the case of two colors (or multicolors) almost overlap. There is almost no error due to this difference in measurement field of view.

[Brief explanation of drawings]

Fig. 1 is an example of a sensor probe for a fiber optic two-color radiation thermometer according to the present invention, Fig. 2 is a diagram illustrating the measurement field of view when the sensor probe of Fig. 1 is used, and Fig. 3 The figure shows a configuration of a two-color radiation thermometer using the sensor probe in Figure 1, and Figure 4 shows a configuration in which the sensor probe for the two-color radiation thermometer is connected to a temperature converter via an optical connector. For example, Fig. 5a is an example of a sensor probe for a three-color radiation thermometer, Fig. 5b is an example of a sensor probe for a four-color radiation thermometer, and Fig. 5c is an example of a sensor probe for a four-color radiation thermometer. An example of using a bundle as a sensor probe, Fig. 6 is an example of a unified configuration of a monochromatic radiation thermometer and a two-color radiation thermometer by using the sensor probe according to the present invention, and Fig. 7 is an example of using the sensor probe according to the present invention. An example of a conventional optical fiber type two-color or multicolor radiation thermometer. FIG. 8 shows an example of a conventional optical fiber type monochromatic radiation thermometer. A, B, C, D...gradient index lens, 1...
...Lens holder, 2, 3...Optical fiber, 31,
32...Narrowband optical filter, 33, 34...Photodetector, 35...Amplifier, 36...Arithmetic circuit, 5
1, 52, 53... Light receiving section, 54... Optical fiber holder, 55, 56, 57... Lens.

Claims (1)

[Scope of utility model registration request] A sensor probe consisting of a light receiving part and a light condensing part each composed of a gradient index lens and connected to each other by an optical fiber, and a photodetector that detects the light obtained with this sensor probe via a narrow band optical filter. , comprising a signal converter consisting of an arithmetic circuit to which the output of the photodetector is given, and in the case of a two-color or multicolor radiation thermometer, a plurality of the light receiving parts are bundled in parallel. Optical fiber radiation thermometer.