JPH04113040U - fiber optic temperature sensor - Google Patents

Abstract

(57) [Abstract] [Purpose] To enable measurement of temperature distribution in an optical fiber temperature sensor that utilizes the photoluminescence properties of phosphor materials. [Structure] Several optical fiber temperature sensors, in which a phosphor material 3 is bonded to an uncoated optical fiber core 2 using a silicone adhesive 4, are sequentially shifted in parallel according to the measurement interval and placed inside a small-diameter Teflon tube 1. Insert into. After insertion, each optical fiber probe is fixed together with the Teflon tube 1 at one point at the optical fiber core portion using an epoxy adhesive 6.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea is an optical fiber temperature sensor that uses phosphor material as an optical transducer. Regarding. Photoluminescence of phosphor materials particularly suitable for measurements in microwave electric fields This invention relates to an optical fiber temperature sensor that utilizes nescence characteristics.

0002

[Conventional technology]

Generally, a phosphor absorbs excitation light and emits visible light. This is a photoluminescent Sense is an optical fiber that uses the photoluminescence properties of phosphors. A fiber temperature sensor can be configured.

0003 FIG. 2 is a structural diagram of the tip of a conventional optical fiber temperature sensor. Optical fiber core wire 1 After bonding the phosphor material 9 to the tip of 2 with silicone adhesive 11, epoxy adhesive is applied. This is a structure coated with Agent 10.

0004 FIG. 3 is an illustrative diagram showing the principle of a conventional optical fiber temperature sensor. Excitation light Ph is guided to the phosphor material 13 by one optical fiber 14 of the sensor probe. fluorescence Body substance 13 has optical properties made by mixing impurities with a high-purity host crystal and growing the crystal. The transducer effect is stable. The excitation light Ph in the phosphor material 13 is The wavelength is converted, and the converted light Ph′ passes through the same optical fiber 14 and is derived as an optical output. It will be done. The wavelength conversion performed by the phosphor material 13 is performed when the phosphor material 13 is arranged. Depending on the temperature of the atmosphere, the wavelength changes as the temperature changes.

[0005] FIG. 4 shows a temperature characteristic diagram of photoluminescence. For excitation light Ph of a certain wavelength The relationship between the wavelength λ of the light converted by the phosphor 16, the intensity P, and the phosphor ambient temperature T is Represents the person in charge. The converted light Ph' is converted into an electrical signal through a filter within the measuring instrument body. Then, an arithmetic circuit is obtained to give the measured temperature to the optical fiber thermometer.

[0006]

[Problem that the idea aims to solve]

When measuring the temperature distribution in the depth direction of a measured object with an optical fiber temperature sensor, the sensor Several probes are required, and they must be fixed at different intervals to be measured. Due to the structure of the sensor probe, the outer diameter may be large, and individual sensor probes may be fixed. There were problems such as how to do it and how much time was wasted.

[0007] This idea is related to improving the conventional problems mentioned above, and is based on a single sensor. An optical fiber temperature sensor that can measure temperature distribution in the depth direction with a probe. is intended to provide.

[0008]

[Means to solve the problem]

This idea is used in optical fiber temperature sensors to remove the coating from the tip of the optical fiber. A sensor probe with a phosphor substance attached to the end that produces photoluminescence. Insert one tube from the tip in parallel according to the measurement interval for the number of points to be measured. It is inserted and fixed.

[0009]

[Effect]

By sealing multiple sensor probes inside the tube, multiple It is now possible to measure the temperature distribution of multiple points in a limited small insertion hole. It can also measure the degree distribution. Such optical fiber temperature sensors also have applications in the medical field. I can consider it.

0010

【Example】

Embodiments of this invention will be described below with reference to the drawings. Figure 1 shows this FIG. 2 is a structural diagram of a tip portion of an optical fiber temperature sensor according to an embodiment of the invention.

[0011] The Teflon tube 1 has a constant inner diameter into which several optical fiber core wires 2 can be inserted. , its inner diameter is approximately equal to the outer diameter of the optical fiber coating 7. Teflon The temperature sensor section is sealed into the tube 1 by inserting the optical fiber coating 7 from the tip. Strip the phosphor material 3 to the tip of the optical fiber core 2 with silicone adhesive. 4. Glue. The cladding diameter of the optical fiber is sufficiently larger than the outer diameter of the optical fiber coating 7. Its small size allows multiple sensor probes to be sealed and integrated. sensor Shift the tip of the probe to the measurement interval and seal it with Teflon tube 8. . Air 5 is contained in the Teflon tube 1 and is sealed with epoxy adhesive 6. The optical fiber core wire 2 is fixed in the Teflon tube 1.

0012

[Effect of the idea]

As mentioned above, this idea removes the coating from the optical fiber and adds fluorescent light to the core of the optical fiber. By joining photomaterials, arranging them sequentially in parallel, and sealing them with tubes. Therefore, the temperature distribution in the depth direction in the narrow groove can be measured.

[Brief explanation of drawings]

FIG. 1 is a structural diagram showing an example of an array type optical fiber temperature sensor of the present invention.

FIG. 2 is a structural diagram of a conventional optical fiber temperature sensor.

FIG. 3 is a diagram for explaining the principle of an optical fiber temperature sensor.

FIG. 4 is a diagram showing photoluminescence characteristics of a phosphor material.

[Explanation of symbols]

1,8 Teflon tube 2 Optical fiber core wire 3 Phosphor substance 4 Silicone adhesive 5 Air 6 Epoxy adhesive 7 Optical fiber coating

Claims (1)

[Scope of utility model registration request] Claim 1: An optical fiber temperature sensor that utilizes the photoluminescence properties of a phosphor substance attached to the tip of an optical fiber from which the coating has been removed, in which two or more optical fiber probes are connected to each of the phosphor substances. Optical fiber temperature sensors are sequentially shifted in the direction of extension and fixed with tubes in parallel.