JPS61182539A - Detecting part of radiation temperature - Google Patents

Abstract

PURPOSE:To reduce the cost of a device by providing a condenser lens on the opening side of the other end of a pipe of which one end is closed and an optical fiber for guiding condensed light. CONSTITUTION:A connection body 1 is fitted to the opening side 2a of the pipe 2 of which one end is closed, and in the connection body 1, the condenser lens 3, a mirror 4 and the optical fiber 5 are arranged on the opening side 2a of the pipe 2. The leading end 2b of the pipe 2 is inserted into the body to be measured and uniformly heated and its inner space becomes black body state. Radiation energy from the leading end 2b is guided into the pipe 2, condensed by the condenser lens 3, reflected by the mirror 4, and guided to an external radiation temperature measuring device through the optical fiber 5 to measure the temperature. In this case, specific radiation ratio compensation is not used and a correct temperature can be measured by the radiation temperature measuring device fixing its radiation ratio compensation to 1 or a value close to 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a detection section of a radiation thermometer using an optical fiber.

[Prior Art] To measure the temperature of a high-temperature object, a thermocouple is inserted into a protective tube attached to a terminal box.

[Problems to be Solved by the Invention] However, platinum-based wires must be used for thermocouple wires used for high 1 ml constant temperatures of 1200°C or higher, which is expensive, and the wires may be damaged by metal vapor. It was easily contaminated and deteriorated. For this reason, the strands are protected by using a heat-resistant thick magnetic tube to prevent deterioration of the strands due to metal vapor, or by using a double seal with quartz, sapphire, etc. However, such methods have problems such as the shape is large, complicated, and expensive, and the response is poor due to the wall thickness, making precise measurement difficult.

The purpose of this invention is to utilize a protective tube for measuring thermal lightning pairs,
Radiation using optical fiber that enables high temperature measurement 1)j
An object of the present invention is to provide a detection part of a thermometer.

[Means for Solving the Problems] The present invention provides a connecting body to which the open side of the other end of a tube with one end closed is connected, a condensing lens provided on the open side of this tube, and this condensing lens. This is a detection section of a radiation thermometer equipped with an optical fiber through which the light collected by the sensor enters the light receiving surface.

[Embodiment] FIG. 1 is a configuration explanatory diagram showing an embodiment of the present invention.

In the figure, 1 is the object to be measured such as the atmosphere inside the furnace, molten steel, etc.
A tube 2, such as a thermocouple protection tube with one end closed, inserted into the
A connecting body such as a terminal box to which the opening side 2a of the storage tube 2 is connected. A mirror 4 for bending the optical path of the condensing light, a light-receiving surface 5a located approximately at the focal length of the condensing lens 3, and an optical fiber 5 into which the light condensed by the condensing lens 3 enters are provided. The mirror 4 is integrally attached to the holding member 6, and the optical fiber 5
The optical fiber 5 is fixed by connecting the connector 5b of the connector 5b to the connector receiver 6a of the holding member 6.
It is fixed to a mounting plate 7 attached to the connecting body 1, and an optical fiber 5 is connected through an opening 1b of the connecting body 1 to an external radiation temperature measuring device (not shown) including a detector and a measuring circuit.

In addition, whether the upper part of the connecting body 1 can be opened and closed with an opening/closing lid, etc.
It has a screw-in type lid, and the tube 2 can be attached to and detached from the connecting body 1 with a screw or the like.

That is, the tip 2b of the tube 2 is the object to be measured, which is in the measurement atmosphere and is uniformly heated, and its internal space is in a black body state. The tIIIJ energy from this tip 2b is
The light is guided by a condenser lens 3, and reaches an external radiation temperature measuring device via an optical fiber 5, where the temperature is measured. In this case, no special emissivity correction is required, and the emissivity correction is fixed at a value of 1 or close to 1. ) A 1m degree measuring device allows accurate temperature measurement.

FIG. 2 shows another embodiment of the invention, in which the same reference numerals as in FIG. Hikari Liver-5
The beam is incident on the beam and measurements are taken.

In this way, instead of the thermocouple, the temperature of the object to be measured can be measured using the protective tube of the thermocouple, the connecting body 1 similar to the terminal box, and the like. Furthermore, the radiation temperature measurement device can also output an output equivalent to a thermal lightning pair.

[Effects of the Invention] As described above, this invention utilizes devices similar to thermocouple protection tubes and terminal boxes, and utilizes optical fibers to
Since U measurement is performed, there are the following advantages.

■ Thin wall maintenance: A-tube can be used, resulting in high-speed response and low cost.

■By using a heat-resistant material for the Fa storage tube,
With an extremely simple structure, it is possible to easily measure temperatures much higher than thermocouples, up to about 1,000°C.

■Temperature measurement uses radiation, but since it uses cavity radiation inside the tube, there is no need to correct emissivity.

■Since there is no infrared detector in the junction box, there is no need for water cooling.
Can be used up to the heat and humidity resistance of optical fiber.

■It is compatible with devices for thermal lightning pairs, the connecting part is not directly exposed to high temperatures, there is little risk of deterioration, and it is highly accurate and reliable.

[Brief explanation of the drawing]

FIGS. 1 and 2 are configuration explanatory diagrams showing one embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Connection body, 2... Tube, 3... Condensing lens, 4... Mirror, 5... Optical fiber, 6...
・Holding member, 7...Mounting plate patent applicant Chino Manufacturing Co., Ltd. Fu20R

Claims (1)

[Claims] 1. A connecting body to which the open side of the other end of a tube with one end closed is connected, a condensing lens provided on the open side of this tube, and light condensed by this condensing lens. and an optical fiber that enters the light-receiving surface of the radiation thermometer. 2. The other end of the optical fiber has an emissivity correction of 1 or 1.
2. The detection unit of a radiation thermometer according to claim 1, further comprising a radiation temperature measuring device connected to a radiation temperature measuring device having a value close to . 3. The detection section of the radiation thermometer according to claim 1, wherein the tube is detachably attached to a connecting body.