JPS6247525A - Radiation thermometer for fiber - Google Patents

Abstract

PURPOSE:To make an optical system brighter and to improve measuring accuracy by providing a reflecting mirror to reflect the energy radiated from a fiber, and receiving the reflected energy by the reflecting mirror. CONSTITUTION:A fiber 14 is supported so as to move in the direction vertical on the paper surface for a holder 16 and a reflecting mirror 18 is fixed to the first arm 16b of the holder 16. On the other hand, a detecting element 20 is fixed to the second arm 16c in opposition to the first arm 16b. The element 20 is, therefore, arranged at the further position to the reflecting mirror than the fiber 14. The temp. sensing element 24 for measuring the temp. of the element 20 is fixed to the second arm 16c of the holder 16, the radiating temp. of the fiber 14 is operated by inputting the output of the element 24 and output of the element 20 together to an arithmetic circuit 26 and the result thereof is displayed on a display circuit 28. The energy radiated from the fiber 14 is then led to the element 20 by being reflected by the reflecting mirror 18 and the optical system can be made brighter because of there being almost nothing to cut off this optical path at this time.

Description

Detailed Description of the Invention The present invention relates to a radiation thermometer that non-contactly measures the radiation temperature of an object to be measured. This invention relates to a radiation thermometer for textiles that measures temperature without contact.

Hikiki! Tsukimiya □ The temperature of fibers with a diameter of about 0.1 mm, such as optical fibers for communication, is measured in the room temperature range of 0°C to 100°C. This is because the measurement area is minute. In order to compensate for the lack of energy, it is necessary to make the measurement optical system brighter. Furthermore, in the fiber manufacturing process where a fiber radiation thermometer is used, the Ir fibers to be measured vibrate in the radial direction because they are run in the longitudinal direction, and it is necessary to remove the influence of this vibration. .

Conventionally, however, the #! a. As a measuring optical system of a radiation thermometer for general use, a reflective optical system as shown in FIGS. 6 and 7 is used. In Figure 6, (2) is the fiber to be measured, (4) and (6) are the primary mirror and secondary mirror that constitute the reflective optical system, respectively, and the energy radiated from the fiber (2) is transmitted to the primary mirror. (4) and then the secondary mirror (6)
is reflected by the sensor and guided to the detection element (8), and from its output i
The radiant temperature of fiber (2) is calculated. In the configuration shown in Figure 7 (
1, the energy radiated from the fiber (2) is fi(
10) and guided to the detection element (12),
The radiation temperature of fiber m(2) is calculated from the output.

However, in such a configuration, the secondary mirror (6) in the case of FIG. 6 and the back of the detection element (12) in the case of FIG. (2) It is difficult to make the optical system brighter because it blocks the energy radiated toward the detection element.

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide a radiation thermometer for textiles that can improve the shortcomings of the conventional device, make the optical system brighter, and improve the measurement accuracy. It is something to do.

In order to achieve the above object, the present invention provides a radiation thermometer for textiles that measures the radiation temperature of fibers, including a reflector that reflects the energy radiated from the fibers. , a detection element having a rectangular detection surface having one side in the radial direction of the fiber to be measured, which is disposed at a position far from the fiber with respect to the reflecting mirror so as to receive the energy reflected by the reflecting mirror. It is characterized by:

Therefore, the energy emitted from the fiber is reflected unobstructed by the reflector and guided to the detection element, making the optical system brighter and even when the fiber being measured is vibrated. The detection surface of the detection element is a rectangle with one side in the radial direction of the fiber, so even if the fiber is vibrated in the radial direction, the image will only move in parallel on the detection surface, which will prevent errors from occurring due to vibration. can be eliminated.

u! L Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

First, Figure tjS1 is a schematic diagram showing a radiation thermometer according to an embodiment of the present invention. In FIG. 1, (14) is the fiber to be measured extending in the direction perpendicular to the plane of the paper, and (16)
is a holder whose cross section is approximately fold-back shape so as to surround this jJ[(14). The holder (16) has an opening (1
6a), and the fibers (
14) is inserted into the holder (16). And wL
The fiber (14) is supported by a holder (16) so as to move in a direction perpendicular to the plane of the paper. The first arm (16b) of the holder (16) has a reflective surface (18a) made of an elliptical or spherical surface. (1, 8) is fixed. On the other hand, the ttS2 arm (16b) opposite the first arm (16b)
A detection element (20) is fixed to c). Therefore,
The detection element (20) is a reflective mirror (18) rather than a fiber (14).
is located far away from the Here, reflector (
18) is configured to reflect the energy emitted from the fiber (14) so as to converge it onto the detection element (20), and when the reflecting mirror (18) has an ellipsoidal reflecting surface, The fiber (14) may be located at one focal point, and the detection element (20) may be located at the other focal point.
Since the magnification of the image does not change significantly even when the fiber (14) vibrates and moves in the optical axis direction, the fiber being measured (14)
The amplitude of the vibration is set to be sufficiently larger than the amplitude of the vibration.

(22) is a chipper placed in front of the detection element (20) to intermittently inject energy into the detection element (20), and this chomper (22) is rotated at a constant speed by a motor (not shown). I am made to do so. Furthermore, a holder (16)
A temperature sensing element (24) for measuring the temperature of the detection element (20) is fixed to the second arm (16c). The output of the temperature sensing element (24) and the output of the detection element (20) are both input to an arithmetic circuit (26) to calculate the radiation temperature of the fiber (14), and the result is sent to a display circuit (28). displayed by. With such a configuration, the fiber (1
4) The energy radiated from is reflected! (18) and is guided to the detection element (20), and since there is almost nothing blocking this optical path at this time, the optical system can be brighter than the conventional device as described above.

Furthermore, the detection element (20) has a rectangular detection surface (20a) as shown in the front view of FIG. extends in the radial direction. Therefore, even if the fiber (14) moves in its radial direction due to vibration, its image (14a) will only move in parallel on the rectangular detection surface (20a), making it possible to reduce errors caused by vibration. .

However, in such a configuration, the image (
It is necessary to consider the background radiation received by the portion (B) that does not receive 14a). However, in the configuration shown in FIG. 1, this background radiation is nothing but radiation from the vicinity of the detection element (20), so its amount can be determined by the temperature sensing element (24). Therefore, if the ratio of the area of the portion (A) on the detection surface of the image (14a) of the fiber (14) to the area of the other portion (B) is stored in advance, the arithmetic circuit (26) 14) The radiation temperature can be determined without the influence of background radiation. Here, the area of the image (14a) on the detection surface can be determined from the predetermined diameter of the fiber 4t (14) and the configuration of the optical system.

In this embodiment, the vicinity of the detection element (20) is blackened to increase the emissivity, and since it is placed close to the reflecting mirror (18), the emissivity is effectively reduced. It can be approximately 1.

Here, the emissivity of am (14) is εf, and the image (14a
), the area of the portion (A) on the detection surface is Sa, and the area of the other portion (B) is sb, then the total area S of the detection surface (20a) is: 5=Sa+Sb (1) It is. Then, the radiation temperature of the fiber (14) is Tf, and the holder (
16) is Tb, and the respective radiant energies are P(Tf) and P(Tb), then the detection element (2
The energy Et received by 0) is Et=^・[Sa(εf −P(Tf)+(1−εf)
・P(Tb)115bll・l'(Tb)11
...(2). However, ^ is a constant determined by the optical system, etc. In addition, the reflective component of the fiber (14) (
+−εf) is assumed to be the radiant energy from an object at temperature Tb.

Then, if Sa/S=γ, equation (2) becomes Et=Δ
・S[γ ・ε f−P(d)+γ(1−ε
")・P(Tb)+(1-γ)・P(Tb)] =＾゛(γ-t r −P(Tf)+(1-7・t
f) −P(Tb)1 (3). Here, 8 = ^S. Then, when formula (3) is solved for P(Tf), P(Tf) = IEt-A1γ-εf)P(Tb)l
/A'-7·εf (4). That is, to constants, fixed data γ and εf,
And from the two measurement data Et, Tb (P(1'b) can be found from the blank radiation equation), (4)
The radiant energy P (Tf) of the fiber (14) is determined based on the formula, and then the fiber (14) is determined based on the blank radiation formula.
14) The radiation temperature Tf can be determined.

In this example, the energy emitted from the fiber (14) is reflected by the reflection In (18) and re-entered by the fiber (14).
14) is the arrangement of the detection element shown in the diagram, and in this example, the fiber (14) is arranged outside the optical path from the reflecting mirror (18) to the detection element (20). has been done. The energy radiated from the a-fiber (14) is reflected by the reflecting mirror (18)! All of the detected light is incident on the detection element (20) and used for temperature measurement, making it possible to further brighten the optical system.

FIG. 4 is a sectional view showing a third embodiment of the present invention. In this embodiment, the fiber (14) is
) are arranged so as to extend one inch in the vertical direction of the figure. The 152 arm (16c) of the holder (16) is provided with a pair of 7-eye holes (30a) (30b) on a straight line passing through the center of the detection surface (20u) above and below the detection element (20). It is being In each hole (30a) (30b), there is a positive plate (32) (34) having one matte surface (32a) (34a) on the same surface as the detection surface (20a) of the detection element (20), respectively. The sender is stuck. Each matte surface (32a) (34a) is engraved with a detection element (20), kale (32b) (34b) as shown in FIG. 34a
) on which an image (14a) of the fiber (14) is clearly formed;
And the position of the radiation thermometer relative to the fiber (14) is set at r? so that the scale (32bH34b) and the image (14a) of the fiber (14) overlap. ! Make adjustments. With this configuration, the position of the optical system of the radiation thermometer can be adjusted, and the radiation energy from the fiber (14) can be efficiently applied to the detection element (20). Image (14a) of (14) can be formed, and measurement accuracy can be further improved.

As described in detail above, the present invention provides a fiber radiation thermometer for measuring the radiation temperature of fibers, which includes a reflecting mirror that reflects energy radiated from the fibers, and an energy reflected by the reflecting mirror. and a detection element having a rectangular detection surface having one side in the radial direction of the fiber to be measured, which is disposed at a position farther from the fiber with respect to the reflecting mirror so as to receive the energy, With this configuration, the energy radiated from the fibers can be more efficiently guided to the detection element to obtain a brighter optical system, and the detection element has one side perpendicular to the direction in which the fibers extend. Since it has an extending rectangular detection surface, even if the a-fiber is vibrated in its radial direction, its image will simply move in parallel on the detection surface, so the vibration of the fiber will not deteriorate measurement accuracy. , measurement accuracy can be further improved.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the tube 1 of the present invention, Fig. 2 is a front view of its detection surface, Fig. 3 is a sectional view of main parts showing the second embodiment, and Fig. 4 is a sectional view of the third embodiment. FIG. 5 is a front view of the detection surface, and FIGS. 6 and 7 are sectional views showing the optical system of a conventional radiation thermometer. (14); Fiber; (18); Reflector; (20); Detection element; (20a); Detection surface. that's all

Claims (1)

[Claims] 1. A radiation thermometer for textiles that measures the radiation temperature of fibers, comprising: a reflector that reflects energy radiated from the fibers; and a reflector that receives the energy reflected by the reflector. A radiation thermometer for fibers, comprising: a detection element having a rectangular detection surface having one side in the radial direction of the fiber to be measured, the detection element being disposed at a position farther from the fiber. 2. The radiation according to claim 1, wherein the reflecting mirror and the detecting element are each supported on mutually opposing surfaces of a holder having a substantially U-shaped cross section and an opening. thermometer.