JPS61184428A - Fiber type temperature sensor - Google Patents

Abstract

PURPOSE:To enhance the heat resistance of a sensor, by doping one terminal of a monocrystalline fiber comprising sodium oxide with cerium oxide. CONSTITUTION:A temp. sensor 1 is constituted of a fiber part 2 and a sensor part 3 and the fiber part 3 is one with a diameter of about 1mm comprising monocrystalline sodium oxide. The sensor part 3 is formed to one end of the fiber part 2 integrally in the same diameter and comprising monocrystalline sodium oxide doped with cerium oxide. Because the sensor part 3 is doped with cerium oxide, said sensor part 3 generates a spectrum corresponding to heating temp. and temp. can be known by this light emitting spectrum. The heat resistance of the sensor can be markedly enhanced so as to provide a m.p. of 2,800 deg.C or more thereto.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fiber type wetness sensor that can measure the flow rate of flame, gas flow, etc. at a high temperature of 2s00''C or higher.

[C technology and its problems] Conventionally, the following methods are known to measure the temperature of flames, gas flows, etc. at temperatures above aooo degrees Celsius. First, a Pi-Pt+Ru thermocouple is used. There is a way to cool it with water. However, this method relies on accuracy and uses water cooling, so the absolute measuring power is 1 BT, and the measurement is troublesome.

There is also a method of estimating the internal temperature of a large flame from the outside using radiant humidity. Since this method estimates the internal temperature, it is not possible to accurately and accurately measure the internal temperature. Another method is to irradiate the gas flow with a laser source and detect the Raman scattering, thereby determining the temperature. However, this method requires large-scale equipment, requires analysis by a computer, and has drawbacks that are not common.

For this reason, a temperature sensor has recently been considered in which an FF# thermometal ON such as iridium, osmium, or tungsten is attached to the tip of a 7-eyeper made of a heat-resistant oxide such as aluminum oxide or yttrium oxide. .

When the tip of this sensor is placed in a flame, it is heated and emits light, and the temperature is detected based on the emission spectrum.It can directly measure the internal temperature of a flame, etc., and is also easy to use. Features include being compact! It is something that you have.

However, in this temperature sensor, the heat-resistant oxide that forms the eyelid and the heat-resistant metal that forms the thin film tend to react at high humidity, so there is the inconvenience that long-term measurement cannot be performed at high humidity. In a sensor in which an iridium thin film is formed on an aluminum oxide 7-iper, the maximum withstand temperature is 2200°C and the normal operating temperature is 200θ°C. For this reason, the temperature is 2700℃ for the kerosene oxygen flame, and 27IO for the oxyhydrogen flame.
``250θ° such as 2100℃ of C5 propane + O flame
It was impossible to measure the temperature of the flame or gas fAi above C.

[Means for solving problems]

Therefore, in this invention, by doping a small amount of ichcerium oxide at one end of a single crystal fiber made of thorium oxide, the sensor has a melting power of more than 100%, greatly improving heat resistance. I tried to solve the above problems.

FIG. 1 shows an example of a fiber type temperature sensor of the present invention, and reference numeral 1 in the figure indicates the fiber type temperature sensor of the present invention. This temperature sensor 1 is composed of a fiber part 2 and a sensor part 3. The fiber part 2 is a fiber made of a single crystal of thorium oxide ('rho) and having a diameter of about l. Further, the sensor section 3 is formed integrally with the fiber hole 2 at one end and has the same diameter, and is made of cerium oxide (
It is made of thorium oxide single crystal doped with Ce(J2).

Also, sensor l! The tip of ls3 is cut at an angle of ≠50 with respect to the axial direction of fiber portion 2, and polished.

Since this sensor part 3 is doped with cerium oxide, when it is heated to lJl+, it emits light with a spectrum corresponding to the temperature, and the temperature can be controlled by this emission spectrum. The doping amount of cerium oxide is 0.0/
~/'Ji 111% is sufficient.

For this reason, even though the sensor part 3 is doped with Ichcerium oxide having a melting point of 960°C, since the amount is small as described above, it shows a #& point of 200°C or more.
Since the fiber portion 2 is made of thorium single crystal, ao
2g:00'' for sensor 1 as a whole
The 7-eye type fn degree sensor 1 is capable of withstanding temperatures up to about 30°C and can measure humidity up to 50°C, as shown in FIG. Then, the rod lens 4 and the detector 5 are bonded together with the original fiber 6, and the detector 5 and the indicator 7 are set so that m=M and used as a thermometer. If the sensor part 3 of the sensor 1 is placed in a flame, the temperature in the flame can be maintained. In particular, since the sensor 830 has a small diameter of 10 degrees, it can measure the temperature at each position in the flame (inner flame, outer flame, etc.) Next, we will explain the manufacturing method of this temperature sensor 1. 0 to do
First, a round bar-shaped rod is formed using triglyceride oxide powder. At this time, a predetermined amount of cerium oxide powder is mixed with the thorium oxide powder forming one end of the rod. Next, this rod is single-crystalized by the zone melt method.Although normal conduction heating can be used as an IJu heat source, here, since thorium oxide has a high melting point, C
O, it is preferable to use laser light. As shown in FIG. 3, the upper end of the rod 8 is irradiated with CO and laser light, and the rod 8 is slowly pulled upward and moved without rotating. C(J, parts resistant to laser light are heated*f
g, and becomes a single crystal when cooled.

Along with this single crystallization, the diameter decreases and becomes fiber-like.
The portion 8a of the lower end hole mixed with the cerium oxide powder is doped with thorium oxide, and the sensor portion 3 is formed. The finishing speed of the rod 8 is adjusted so that the finished diameters of the fiber hole 2 and the sensor section 3 are constant.
Then, the i part of the sensor part 3 of the obtained 7-aipa was rotated by 5 degrees.
By cutting the parts of the fiber part 2 at an angle of 900 degrees and polishing them, the temperature sensor 1 with the gap can be obtained. Diameter 3N, length 300
M! 1 rod was made. The powder at the 6 mm length of the lower end of the rod was mixed with aoszm% of cerium oxide powder. A CO2 laser beam with an output of 10W was irradiated from the upper end of this rod where the powdered serium was not mixed.
Excited, I gradually pulled up the rod and crystallized it from the upper end. Due to single crystallization, the diameter becomes l-long, the length also shrinks,
The length of the Ichcerium acid doped part (sensor part) was 1 fOB, and the length of the fiber part was 1 fOB. Cut the ends of this eye/gu into ti s Q and qQo as described above.

It was polished and made into a temperature sensor.

When the sensor part of this temperature sensor was inserted into the highest temperature part of the acetic acid-hydrogen flame, it was confirmed that it did not melt at all.

This temperature sensor was then connected to a detector as shown in FIG. 2 to form a thermometer. This hygrometer was calibrated to 2200° C. using a blackbody furnace with a known temperature. The detector used was one that received light at a wavelength of θ g μm from a photodiode and determined its intensity, thereby determining the temperature.

As a result, it was found that this temperature sensor is capable of 2111 in the range of 600A-200C. Furthermore, when the temperature distribution of the oxyhydrogen flame was measured using this method, the results shown in Figure 1 were obtained.

〔Effect of the invention〕

As explained above, the fiber-type temperature sensor of the present invention is made by doping one end of the fiber made of thorium oxide single crystal with cerium oxide, so that the doping wrinkles of monoacid (t'cerium) are slight. Therefore, the high melting point of thorium oxide, which is higher than J 000'C, is utilized, and 2g00
It is possible to achieve a common temperature of about 100°F, and it can be used not only for core IO'C oxyhydrogen flame, but also for propane + oxygen flame at 200°C.
tJI! J becomes possible to get wet.

In addition, since the sensor itself is small, it is capable of measuring temperatures in small areas such as the temperature at each position of 'fAs within the flame.◇

[Brief explanation of drawings]

1IQ is a side view showing one part of the fiber-type temperature sensor of this invention, FIG. 2 is a schematic configuration diagram showing an example of a thermometer based on the fiber-type temperature sensor of this invention, and FIG. A schematic configuration diagram showing the manufacturing method of the sensor, and Fig. ...Fiber type temperature sensor, 2...
Fiber part, 3...Sensor part. Figure 2 Ward Ofu faction

Claims (1)

[Claims] A fiber type temperature sensor made of a single crystal thorium oxide fiber doped with cerium oxide at one end.