JPH0416804A - Optical fiber leading-in device - Google Patents

Abstract

PURPOSE:To prevent an optical fiber from protruding out and breaking, and a protection member for preventing the breakage of the optical fiber from breaking owing to the leak of high-pressure gas by providing an optical fiber holder with a leak hole for discharging a pressure medium on the way of a sealing member. CONSTITUTION:The leak hole 37 for discharging the pressure medium halfway from the sealing member 27 is formed in the optical fiber holder 22 so as to link a halfway point of an intake hole 24 which extends from the inside A of a high-pressure device to the outside B with the outside B. Then the progress of the breakage reaches the position of the leak hole 37, the high-pressure gas is discharged to the outside B of the high-pressure device through this leak hole 37. At this time, the sealing member 27 is present from the position of the leak hole 37 to the outside B of the high-pressure device, so even if the sealing member 27 to the leak hole 37 is broken entirely, the optical fiber 26 is held by the optical fiber holder 22 and never protrudes from the holder 22. Consequently, the optical fiber 26 is prevented effectively from breaking and protruding.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an optical fiber introducing device when using an optical fiber to introduce optical energy into a high pressure gas atmosphere.

(Prior Art) Recent advances in high-pressure equipment technology have made it possible to operate stably at pressures as high as several 100 MPa in high-pressure equipment using gas or liquid as a pressure medium.

However, although electrical signals have been used exclusively as a means of knowing the internal situation of high-pressure equipment during processing, there are some processes where it is preferable to visually observe the internal situation, and an example of this is the use of optical fibers. A technique for extracting optical signals within a direct pressure device can be seen in the HJP device. On the other hand, there are also devices that use optical fibers to introduce optical energy into the high-pressure device.

As shown in FIGS. 7 and 8, the structure of the part for introducing the optical fiber into the high-pressure device is as follows:
A mounting hole 4 with an inner diameter into which the sleeve 3 can be inserted and an introduction hole 6 with an inner diameter into which the optical fiber 5 can be inserted are provided in stages, and the optical fiber 5 with the sleeve 3 airtightly provided at the tip is inserted into the hole 4. .6, thereby introducing the optical fiber 5 from the outside B side of the high voltage equipment to the inside A side of the high voltage equipment U.
ing. Furthermore, a sealing member 7 is placed in each gap between the mounting hole 4 and the sleeve 3 and the introduction hole 6 and the optical fiber 5 to airtightly seal the optical fiber 5 having the sleeve 3 at its tip. The tip end surface 5a is optically polished together with the end surface 3a of the sleeve 3 to enable transmission and reception of optical signals, and an optical fiber receptacle 12 having a fitting hole 11 into which a sleeve 10 for the extension optical fiber 9 can be inserted is optically polished. There is one in which the optical fiber 5 and the optical fiber 5 are arranged concentrically on the end face 2a of the Phino\ holder 2 (for example, JP-A-62-91903).

(Problem B to be solved by the invention) However, in the conventional case, when optical energy (high energy beam) is introduced into high gas pressure, the optical fiber introduction part ( The optical fiber itself or the optical fiber's sealing member may be damaged. If such damage occurs, the high-pressure gas in the high-pressure device will leak, causing the optical fiber 5 to be ejected or broken, or the protective member for preventing damage to the optical fiber 5 to be damaged, resulting in safety problems. gave birth to

SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to prevent the optical fiber from popping out or being damaged due to the leakage of high-pressure gas, and from damaging the protective member for preventing damage to the optical fiber, thereby ensuring safety.

(Means for Solving the Problem) A tenth technical means of the present invention for solving this technical problem is that an optical fiber holder 22 having a high-pressure sealing means is provided in a high-pressure container 21, and the optical fiber holder 22 An introduction hole 24 leading from the outside B of the high pressure device to the inside A of the high pressure device is provided in the introduction hole 24. An optical fiber 26 for high energy beam transmission is inserted through this introduction hole 24, and the optical fiber 26 and the optical fiber holder 22 are connected to each other. Between '= the optical fiber introduction device 62 δ with the sealing member 27 interposed, and the optical fiber holder 2
2, a leak hole 37 for letting the pressure medium escape is provided in the middle of the sealing member 27.

It is in the point of being.

Moreover, the second technical means is that the optical fiber holder 2
A protective member 3 for the optical fiber 26 is placed on the outside B side of the high-voltage device No. 2.
9 is directly connected.

Furthermore, the third technical means of the present invention is Gao I Wang Rong 521
An optical fiber holder 22 having a high-pressure sealing means is provided in the optical fiber holder 22, and an introduction hole 24 leading from the outside to the internal arm of the high-pressure device is provided in the optical fiber holder 22.
An optical fiber 26 for high-energy beam transmission is inserted into the optical fiber introducing device in which a sealing member 27 is interposed between the optical fiber 26 and the optical fiber holder 22, and the light leaking from the optical fiber 26 is removed. Temperature detection means 41 for detecting heat generation due to energy leakage is provided, and introduction stop means 45 for stopping the introduction of the high-pressure 2 Lugie beam into the optical fiber 26 when the temperature detected by the temperature detection means 4J exceeds a predetermined value. is set at the point η.

(Function) Thermal effects due to the optical energy transmitted by the optical fiber holder 26 tend to occur on the side A inside the high-voltage device of the optical fiber holder 22, and therefore, damage to the sealing member 27 is prevented from the side A inside the high-pressure device. Shimaru. This damage progresses toward the outside B of the high-pressure device due to the high-pressure gas inside the high-pressure device A. but,
In the embodiments shown in FIGS. 1, 3 and 4, when the damage progresses to the leak hole 37, the high pressure gas is released to the outside B of the high pressure device through the leak hole 37. At this time, since the sealing member 27 exists from the position of the leak hole 37 toward the outside B of the Takasho equipment, even if the sealing member 27 up to the temporary leak hole 37 is completely damaged, the optical fiber 26 is held by the optical fiber holder 22, and the holder 2
It doesn't jump out from 2.

Furthermore, in the case of the embodiments shown in FIGS. 3 and 4, the protective member 3
9 to prevent breakage of the optical fiber 26, but in this case as well, since the leak hole 37 and the sealing member 27 exist from the position of the leak hole 37 toward the outside B of the high voltage device, the leaked high pressure The gas does not reach the protection member 39, and therefore the protection function of the protection member 39 is made stable, thereby further increasing the safety of the optical fiber introduction device.

In the case of FIG. 5, when the optical energy transmitted through the optical fiber 26 leaks, the temperature detection means 41 detects the heat generated by the leakage of optical energy, and when the detected temperature exceeds a predetermined value, the The stop means 45 is activated to stop the introduction of high energy into the optical fiber 26. Therefore, damage to the optical fiber 26 can be prevented.

(Example) Hereinafter, the present invention will be explained according to the illustrated example.
In the figure, 21 is a high-pressure container, 22 is a truncated conical optical fiber holder having a high-pressure sealing means, and the high-pressure container 21
are fitted and fixed in an airtight manner via an O-ring 23. The optical fiber holder 22 is provided with an introduction hole 24 extending from the outside B of the high-pressure device to the inside A of the high-pressure device.

Reference numeral 26 denotes an optical fiber for high-energy beam transmission, which is inserted through the introduction hole 24, and the optical fiber 26 is introduced from the outside B side to the inside A side of the high-pressure device. A sealing member 27 is interposed between the optical fiber 26 and the optical fiber holder 22, and the optical fiber 26 is fixed to the sealing member 27 over its entire length.

The external B side of the optical fiber 26 is placed close to the laser oscillator 28, and the external B side end of the optical fiber 26 is an input end 29.
The laser beam (light energy) oscillated by the laser oscillator 28 is made incident on this incident end 29 . For example, in the case of a YAG laser, the laser oscillator 28 includes a YAG rod 30 and a total reflection mirror 31 as shown in FIG.
, the partial reflection mirror 32 and the mechanical shutter 33, and while the laser beam is repeatedly reflected between the mirrors 31 and 32, a portion (for example, 50%) of the laser beam is oscillated from the partial reflection mirror 32 side. And mechanical shank
33, all of the laser light passes through the mechanical shutter 33 and is oscillated from the laser oscillator 28.

Further, when the mechanical shutter 33 is turned off, the laser light no longer passes through the mechanical shutter 33, and the oscillation of the laser light from the laser oscillator 28 is stopped.

The end of the optical fiber 26 on the inside A side is an eight-emitting end 35, and the laser beam oscillated from the laser oscillator 28 is transmitted through the optical fiber 26 and emitted from the emitting end 35 to the inside A of the high-voltage device. be done. This emitted laser light (light energy) is used inside the high-pressure device A to modify the surface of ceramics, for example.

37 is a leak hole for escaping the pressure medium from the middle of the sealing member 27, and is a leak hole for letting the pressure medium escape from the middle of the sealing member 27.
The introduction hole 24 is formed so as to communicate with the outside B side in the middle of the introduction hole 24 extending from the outside B to the outside B side.

FIG. 3 shows another embodiment, in which a protection member 39 for the optical fiber 26 is provided on the outside B side of the high-pressure device of the optical fiber holder 22. This protection member 39 is made of, for example, a polymer material, and is coated on the high-voltage device exterior B side of the optical fiber 26, and is sealed in the attachment hole 40 provided at the end of the optical fiber holder 22 on the high-voltage device exterior B side. This protective member 39 is directly fixed to the optical fiber holder 22 with a name tag or adhesive.
This prevents the optical fiber 26 from breaking. In other respects, the configuration is similar to that of the previous embodiment.

FIG. 4 shows a modification of the installation of the protection member 39, in which the protection member 39 is made of, for example, a SUS flexible tube, and is fixed to the tips of eight external high-pressure devices of the optical fiber holder 22 with screws or adhesive. This is what I did. in this case,
The protection member 39 prevents the optical fiber 26 from being damaged and also prevents the high-energy beam from leaking to the outside when it leaks from the optical fiber 26, making it extremely safe for high-energy beam introduction. In other respects, the configuration is similar to that of the previous embodiment.

FIG. 5 shows another embodiment in which the optical fiber 26 is located at a location where optical energy is likely to leak, e.g.
output end 35, high pressure seal part 43 (optical fiber holder 2
Temperature detection means such as thermocouples TCA, T
Cm, TCc are provided, and the temperature detecting means TC,.

Te1. The heat generated by the leakage of optical energy is detected by the TC. In addition, the temperature detection means TCA, TCI! , TCC may be provided, or temperature detection means TCa, TCe may be provided.
, TCc, two or all of them may be provided. When the temperature detected by the temperature detection means TC exceeds a predetermined value, the high-energy beam is stopped from entering the optical fiber 26 by the introduction stop means 45 shown in FIG.

That is, the introduction stop means 45 includes a laser control unit 46 and a shutter drive section 47, and the laser control unit 46 inputs a temperature signal from the temperature detection means TC and operates the shutter 33 according to the detected temperature. Outputs a control signal for on/off control. The shutter drive unit 47 inputs a control signal from the laser control unit 46, turns off the mechanical shank 33 when the temperature detected by the temperature detection means TC exceeds a predetermined value, and turns off the mechanical shank 33 when the detected temperature is below a predetermined value. The shutter 33 is configured to be turned on.

(Effects of the Invention) According to the present invention, the sealing member 2 is attached to the optical fiber holder 22.
Since a leak hole 37 is provided to allow the pressure medium to escape from the middle of the optical fiber 7, the leak hole 37 and the sealing member 27 are located downstream of the leak hole 37, so that the optical fiber 26 may be damaged or the optical fiber 26 may be damaged. It is possible to effectively prevent the objects from popping out.

Furthermore, on the high pressure device external B side of the optical fiber holder 22,
Since the protection member 39 of the optical fiber 26 is directly connected, not only can damage to the optical fiber 26 be prevented, but also safety in the event of light energy leakage is further increased, and the optical fiber introducing device for guiding high energy beams can be used. It will be the best one.

Further, temperature detection means TC is provided to detect heat generated by light energy leaking from the optical fiber 26, and when the temperature detected by the temperature detection means TC exceeds a predetermined value, the high-energy beam is introduced into the optical fiber 26. Since the introduction stop means 45 is provided, it is possible to prevent damage to the expensive optical fiber introduction section, and also to prevent the risk of high-pressure gas blowing out due to damage. High safety as a beam guiding means can be ensured.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention, FIG. 2 is a configuration diagram of the same laser oscillator, FIG. 3 is a sectional view showing another embodiment, and the fourth section is a sectional view showing another embodiment. FIG. 5 is a sectional view showing another embodiment, and FIG. 6 is a sectional view showing another embodiment. It is the same bronc diagram. FIG. 7 is a sectional view showing a conventional example, and FIG. 8 is a sectional view of the tip of the same optical fiber. 21-high pressure container, 22 optical fiber holder, 24-introduction hole, 26-optical fiber, 27-sealing member, 37 ref hole, 39 protection member, 45-introduction stop means, TCA
, TCETC, - temperature detection means. Patent a applicant Director of the National Institute of Industrial Science and Technology Ken Sugiyu Co., Ltd. Kobe Manufacturing Co., Ltd. Fig. 6 A Fig. 2 Fig. 3 Fig. 5 Fig. 7 Fig.

Claims (3)

[Claims] (1) An optical fiber holder (22) having a high-pressure sealing means is provided in the high-pressure container (21), and the optical fiber holder (22) is connected from the outside of the high-pressure device (B) to the inside of the high-pressure device (
An introduction hole (24) leading to A) is provided, and this introduction hole (24)
4) Optical fiber (26) for high energy beam transmission
is inserted, and the optical fiber (26) and the optical fiber holder (
In the optical fiber introducing device in which a sealing member (27) is interposed between the optical fiber holder (22) and the optical fiber holder (22), the optical fiber holder (22) is provided with a leak hole ( 37) An optical fiber introducing device characterized by being provided with. (2) Outside the high pressure device of the optical fiber holder (22) (
B) An optical fiber introduction device characterized in that a protection member (39) for the optical fiber (26) is directly connected to the side. (3) The high-pressure container (21) is provided with an optical fiber holder (22) having a high-pressure sealing means, and the optical fiber holder (22) has an introduction hole (24) leading from the outside to the inside of the high-pressure device (A). An optical fiber (26) for high-energy beam transmission is inserted into the introduction hole (24), and a sealing member (27) is inserted between the optical fiber (26) and the optical fiber holder (22). In the interposed optical fiber introducing device, a temperature detection means (TC) is provided to detect heat generation due to light energy leaking from the optical fiber (26), and when the detected temperature of this temperature detection means (TC) exceeds a predetermined value, An optical fiber introduction device characterized in that an introduction stopping means (45) is provided for stopping introduction of a high-energy beam into an optical fiber (26).