JPS60224043A - optical sensor head - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an optical sensor head used for detecting dirt in liquid such as engine oil and measuring gas concentration.

[Prior art and its problems]

For example, in an engine oil contamination detection device, an optical fiber on the light emitting side and an optical fiber on the light receiving side are opposed to each other with a gap for measurement, and this gap is filled with engine oil to measure the amount of light transmitted. The degree of contamination of the engine oil was being measured. In this type of device, accurate measurements cannot be made if the measurement gap is dirty, so the opposite side of the gap must be cleaned or wiped. However, since the measurement gaps are narrow, cleaning and wiping are difficult.

[Purpose of the invention]

The present invention provides an optical sensor head that allows cleaning and wiping of opposing surfaces of a measurement gap to be performed extremely easily and enables accurate measurements.

[Embodiments of the invention]

In FIGS. 1 and 2, a holder 5 of an optical sensor head 2 is attached to the tip of a measuring pipe 1 extending from a measuring device. The holder 5 has a downwardly opened space 6a, and a mounting screw is formed on the outer periphery of the lower end. A 4ftX cap is screwed onto this mounting screw. A reflecting member 5 is attached to the upper part of the space 3a of the holder 6, and an optical fiber 6 on the light emitting side is mounted on the upper surface of the reflecting member 5.
The end faces of the optical fibers 7 on the light receiving side are in contact with each other. The reflecting member 5 and the optical fibers 6.7 constitute a light guide that transmits light. The reflecting member 5 has a cylindrical shape with a through hole 5a in the center and a conical surface 5'b' formed on the lower outer periphery, and the conical surface 5b is mirror-finished by vacuum deposition or the like. The optical fiber 6.7 is passed through the inside of the measuring pipe 1 and continues to the measuring device, and inside the measuring device, the upper end of the optical fiber 6 on the light emitting side 1 faces a light emitting element (not shown) such as a light emitting diode. The optical fiber 7 on the receiving side
The upper end faces a light receiving element (not shown) such as a phototransistor. An escape hole 5b with a slightly larger diameter is bored in the upper part of the space 6a of the holder 6 in correspondence with the through hole 5a of the reflective member 5. The entrance/exit 5C is open to the outside. The opened cap 4 is provided with an opening 4a below the object to be measured, which opens to the outside. A wiping shaft 8 constituting a wiping means is slidably supported in the center of the cap 4, and a compression spring is provided between the cap 4 and a spring holder 9 screwed to the lower end. 10 is biased in the jDT direction, and the flange portion 8a is in a rainbow modified manner so as to come into contact with the inner wall of the cap. A rubber ring 11 is attached to the upper part of the wiping shaft 8 as a wiping member, and this rubber ring 11 is formed to have a slightly larger diameter than the through hole 5a of the reflective member 50.
It can be inserted into the through hole 5a. In this way, an optical path 12 is constituted by the light guide such as the optical fiber 6, the reflective member 5, and the optical fiber 7, and a through hole 5a is provided in the middle of the optical path 12.
voids are formed.

The inner surface of the through hole 5a, which is the opposing surface of the gap, is wiped by the rubber ring 11.

When measuring, for example, engine oil contamination with a measuring device having the optical sensor head configured as described above, the optical sensor head 2 is attached by inserting the companion measurement knob 1 into the mounting hole of the engine's level gauge. The engine oil enters the lower inlet/outlet 4a into the rainbow holder 5, the upper inlet/outlet 5Q,
The escape hole 61) serves as an air vent, and the inside of the holder 6 is filled with engine oil. Then, when the light emitting element is activated and light is transmitted to the optical fiber B, the light is reflected by the reflection member 5, crosses the engine oil in the through hole 5a, is reflected by the reflection member 5 again, and is sent to the light receiving side. The original fiber 7 leads to the light receiving element. The amount of light reaching the light-receiving element is used to measure engine oil contamination. After use or when measuring another object to be measured, push in the wiping shaft 8 and attach the rubber ring 11 to the reflective member 5 as shown in Figure 5.
Push the tip into the through hole 5a and use the wiping shaft 8 as the base. As a result, the opposite surface of the through hole 5a is wiped by the rubber ring 11. Place the Nakakotsu sensor head 2 in Toyo liquid and wipe it off 9.
By moving the shaft 8 up and down several times, the inner surface of the through hole 5a can be cleaned. Therefore, measured a+ /l'+ knee 1
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In this embodiment, a reflecting member having a conical reflecting surface is used to change the direction of the optical path, but two triangular prisms may be used to change the direction of the optical path. In this case, since the opposing surfaces of the gap between the two triangular prisms are flat, the wiping member must also have a shape that faces the flat surface. Further, a plurality of acute-angled wiping pieces may be provided protruding from the wiping surface of the wiping member for efficient wiping.

〔Effect of the invention〕

According to the present invention, since a measurement gap is provided in the middle of the optical path and the surface facing the gap is wiped, dirt such as engine oil can be measured accurately and quickly. It is also extremely easy to operate.

[Brief explanation of drawings]

The drawings show an example of the present invention, and FIG. 1 is a sectional view of the main part;
FIG. 2 is a sectional view taken along the line in FIG. 1, and FIG. 6 is a sectional view showing the operating state. 2... Optical sensor head 5... Reflection member 5a... Through hole 6.7... Optical fin (8... Wiping shaft 11... Rubber ring 12... Above optical path Patent applicant Seikosha Co., Ltd. Figure 1

Claims (2)

[Claims] (1) An optical sensor head characterized in that an optical path is formed in a light guide, a gap for measurement is formed in the middle of the optical path, and a wiping means is provided for wiping a surface facing the gap. . (2) A light guide is disposed inside the measurement pipe, an optical path is formed by the light guide, a gap for measurement is formed in the middle of the optical path, and a wiping shaft is installed at the tip of the measurement pipe. An optical sensor head characterized in that a wiping member is slidably disposed and is disposed on the wiping shaft for wiping opposing surfaces of the gap.