JPS61145413A - Sensing apparatus - Google Patents

Abstract

PURPOSE:To enable simultaneous sensing of divergent positions of a plurality of specimens, by constructing the sensing unit with a group of light-sending optical fibers with one end bundled and the other one, branched off into a plurality of sections and a group of light-receiving optical fibers. CONSTITUTION:The other end 21B of a group 21 of light-sending optical fibers is fixed with top and bottom layers and the other end 22B of a group 22 of light-receiving optical fibers are fixed in layers and a detecting end is arranged alternatedly or in circular form or in layers. A beam of light from a light-source 1 is irradiated from one end 21A of the group 21 and leaves the other end 21B. Wen a specimen is located on the detecting end of the other end 21B, a reflected beam enters from the other end 22B of the fiber 22 and leaves one end 22A. And, the leaving beam of light is photographed with a cameral of light-receiving unit 3 for detection. As the group of fibers 22 is provided with 5 detecting ends, a simultaneous sensing of 5 specimens becomes available. And, in the case of a rolling and zigzag running specimen, as any one of detecting ends I-V and also an amplitude can be detected, detection of the specimen by following the same procedures become possible.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a sensing device using optical fibers.

(Prior Art) (Prior Art) Sensing devices using optical fibers have recently been used to detect the presence and state of running or moving objects.

Such a sensing device generally has a pair of optical fibers for transmitting light and optical fibers for receiving light, and detects an object to be sensed at one predetermined position.

(Problem to be Solved by the Invention) However, when a sensing device is constructed by combining one-to-one light transmitting and receiving fibers in this way, it is difficult to detect yarn breakage in a large number of yarns running in parallel. This method requires a light source and a light receiving device, making the entire device large-scale and complicating the arrangement of each fiber.

In addition, when sensing a single object, if you try to detect it at a fixed position, the detection position may shift due to slight lateral vibration or meandering, such as when detecting a running thread or an object on an endless belt. Therefore, there was a regret that satisfactory sensing could not be achieved.

In view of this situation, the present invention is designed to simultaneously sense a wide range of locations where there are a large number of objects to be sensed,
The aim is to provide a device that can perform sensing even when the position is shifted.

(Means for Solving the Problems) That is, the gist of the present invention is to provide a sensing device comprising a light source section, a sensing section, and a light receiving section, in which one end is converged and the other end is branched into a plurality of light beams. A group of optical fibers and a group of light-receiving optical fibers constitute a sensing section, and one end of the group of light-transmitting optical fibers is placed opposite to the light source section. A sensing device is provided which is disposed opposite to a light receiving section, and further comprises a detecting end formed by gathering the other end of each branch.

The present invention will be described below with reference to drawings of embodiments.

FIG. 1 shows an embodiment of the present invention, in which (1) is a light source section, (2) is a sensing section, and (3) is a light receiving section. The present invention is characterized in that such a sensing device has a unique sensing section (2) made of an optical fiber.

In other words, the sensing unit +21 of the present invention includes a group of optical fibers for light transmission (both of which have one end converged and the other end branched into a plurality of parts).
21) and a group of light receiving optical fibers (22). The focused end (21A) of the light transmitting optical fiber group (21) is placed opposite to the light source (1), and the focused end (22A) of the light receiving optical fiber group (22) is connected to the light receiving section (3). It is set up opposite.

Further, the branched other ends (21B) and (22B) of the respective optical fiber groups (21) and (22) are assembled to form respective detection ends. In the example of FIG. 1, each optical fiber group (21), (22)
Five other ends are used to form the detection ends (I) to M, but of course the number of detection ends can be increased or decreased as appropriate depending on the purpose. In this example, one end (21A) of the group of original fibers for light transmission (21) is at random, and one end (22A) of the group of optical fibers for light reception (22) is tX
They are arranged in layers, and a solid-state camera is used as the light receiving section (3).

In addition, in the example shown in Fig. 1, the optical fiber group for light transmission (2
1) The other end (21B) is arranged in the upper and lower layers, and the other end (22B) of the light-receiving optical fiber group (22) is arranged between them to form a layered structure. They may be arranged alternately as shown in (Bl) or circularly in layers as shown in (O. In the figure, for convenience, the light 7 eyepers of the light transmitting optical fiber group (21) are shaded.

Since the present invention is configured as described above, the light emitted from the light source section (1) enters from one end (21A) of the light transmission optical fiber group (21) and exits from the other end (21B). do. When an object to be sensed exists at the detection end of the other end (21B), the light reflected by the object enters the other end (22B) of the light receiving optical fiber (22), is guided, and exits from the one end (22A). do.

The emitted light is then photographed by a solid-state camera serving as a light receiving section (3) to detect an object to be sensed. However, when there is no object to be sensed, no reflection occurs, and therefore the light receiving optical fiber group No light is incident on (22). In the example shown in Fig. 1, five detection terminals (11 to (1)) are provided, so five detection terminals can be sensed at the same time.Furthermore, in the case of an object to be sensed that oscillates sideways or meanders, ( 1)
One of the detection ends from to ■ will be detected,
The amplitude can also be detected, and the size of the sensing target portion can be sensed in the same way.

3 and 4 show another embodiment of the present invention, and FIG. 3 shows an example in which a laser device is used as the light source section (1) and a photomultiplier tube is used as the light receiving section (3). It shows. Here, (11) is a laser 1. such as a gas laser or a semiconductor radar. (12) is a rotating polygon mirror, (13) is a correction lens, and five detection ends are provided. In addition,
One end of the light transmission optical fiber group (21) in this example (
21A) are arranged and focused in two layers, and the other end (21A) is arranged in two layers and focused.
B) fZ They are arranged in a layered manner as in FIG. 1, and the other end (22B) of the light-receiving optical fiber group (22) is also arranged in a layered manner. In this example, the laser device as the light source section (1) sequentially senses one end (21A) of the light transmitting fiber group (21) according to the detection end (Il~(to)). ing.

The example in Figure 4 is a more compact version of the device shown in Figure 1, with a light source section (1) and a light receiving section ('lb f3).
Although the light transmitting optical fiber group (21) and the light receiving optical fiber group (22) are arranged close to each other and overlapped, this is not substantially different from the above example. Note that (4) in the figure is a partition plate provided between the light source section (1) and the light receiving section (3).

(Effects of the Invention) Since the present invention has the configuration as described in detail above, it has the advantage of being able to efficiently sense a plurality of objects to be sensed at the same time. There is an advantage in that it is possible to provide a sensing device that can sense not only the presence but also the size of an object, or even an object to be sensed that is swaying or meandering.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing one embodiment of the present invention, Fig. 2 is a partial plan view showing another example of the arrangement of optical fibers constituting the detection end, and Figs. 3 and 4 are a perspective view showing one embodiment of the present invention. FIG. 7 is a perspective view showing another embodiment. (1)・・・・・・・・・・・・Light source part (2)・
・・・・・・・・・・・・・・・Sensing part (21)・
...... Optical fiber group for light transmission (21A)...
......One end (21B)...Other end (22)...Group of optical fibers for light reception (2
2A)......One end (22B)......Other end (3)......Light receiving part 17 purpose 3 figure

Claims (1)

[Claims] In a sensing device consisting of a light source section, a sensing section, and a light receiving section, the sensing section is constituted by a group of optical fibers for transmitting light and a group of optical fibers for receiving light, each of which has one end converged and the other end branched into a plurality of parts. One focused end of our light transmitting optical fiber group is placed opposite to the light source section, and one focused end of the light receiving fiber group is placed opposite to the light receiving section, and the other end of each branch is brought together for detection. A sensing device characterized in that an end is configured.