CN215598566U - Protection device of optical fiber thermometer - Google Patents
Protection device of optical fiber thermometer Download PDFInfo
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- CN215598566U CN215598566U CN202121166542.8U CN202121166542U CN215598566U CN 215598566 U CN215598566 U CN 215598566U CN 202121166542 U CN202121166542 U CN 202121166542U CN 215598566 U CN215598566 U CN 215598566U
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Abstract
The utility model provides a protection device of an optical fiber thermometer, which comprises: the optical fiber isolation protection tube is internally sealed with flowing cooling medium, and the optical fiber thermometer is arranged in the medium of a cold area in the optical fiber isolation protection tube. The optical fiber insulation protection tube with the cooling medium is added to the embedded optical fiber thermometer, the protection measure prolongs the aging process of the optical fiber material, avoids the temperature gradual change drift phenomenon of the linear temperature sensor, prolongs the service life of the optical fiber thermometer and improves the reliability and the practicability of the optical fiber thermometer.
Description
Technical Field
The utility model relates to the technical field of temperature measurement, in particular to a protection device of an optical fiber thermometer.
Background
The optical fiber temperature sensor is a sensing device, and analyzes the spectrum transmitted by an optical fiber to know the real-time temperature by utilizing the principle that the spectrum absorbed by partial substances changes along with the temperature change.
For example: the temperature measurement component is a laser-linear temperature sensor, the space temperature distribution information is obtained by utilizing spontaneous Raman scattering and optical time domain reflection technology when the laser is transmitted in the linear temperature sensor, when a pulse light source with certain energy is injected into the linear temperature sensor, the pulse light source interacts with linear temperature sensor molecules, backward Raman scattering light is continuously generated when the light is transmitted forwards, wherein the Raman scattering is that anti-Stokes light with the wavelength shorter than that of the light source can be generated due to the thermal vibration of the linear temperature sensor molecules, and the intensity of an anti-Stokes light signal is related to the temperature, so that the temperature information of any point can be obtained. In addition, the temperature position can be accurately positioned according to the light speed and the feedback time.
At present, optical fiber thermometers are used in industrial production in a large quantity, and compared with traditional thermocouple thermometers made of precious metals such as platinum and rhodium, the optical fiber thermometers have the advantages of oxidation resistance, electromagnetic interference resistance, corrosion resistance, remote transmission capability, low price and the like. For example: the laser-linear temperature sensor type optical fiber thermometer has the main technical parameters: the temperature measurement length is 0-3 km (can be expanded to 10 km); the temperature measuring range is-50 ℃ to +400 ℃ (larger range can be customized); the temperature measurement resolution is 0.2 ℃; the temperature measurement precision is +/-0.5 ℃ and @1km and +/-1.0 ℃ and @3 km; the feedback time is 1s @1km, and 2s @3 km; spatial resolution 0.3m (along the thermometric sample length), and so on.
However, as the use of fiber optic thermometers in industry has increased, disadvantages have also been manifested, such as: firstly, the material is glass or plastic optical fiber which is encapsulated in a sheath or a braided sheath, still is fragile and easy to break, and is not easy to repair even damage; secondly, under severe working conditions, if the optical fiber material meets acid and alkali, reducing atmosphere, high temperature and high pressure and the like, the aging process of the optical fiber material can be accelerated, the temperature of the linear temperature sensor gradually changes and drifts, and the creep decline occurs in the twenty-year and the next-year in the present year along with the time lapse. Therefore, a protection device for a fiber optic thermometer is needed.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a protection device for an optical fiber thermometer, which is used to solve the problem of the aging and drifting of the optical fiber thermometer caused by the harsh working environment in the prior art.
To achieve the above and other related objects, the present invention provides a protection device for a fiber optic thermometer, comprising:
the optical fiber isolation protection tube is internally sealed with flowing cooling medium, and the optical fiber thermometer is arranged in the medium of a cold area in the optical fiber isolation protection tube.
In an embodiment of the utility model, the optical fiber isolation protection tube is annularly arranged along an outer wall of the furnace body.
In an embodiment of the utility model, the optical fiber isolation protection tube is a heat-conducting metal tube.
In an embodiment of the present invention, the optical fiber isolation protection tube includes a front guiding section, an optical cable working section, and a rear guiding section, which are connected together, wherein an input end of the front guiding section is connected to a cooling medium input tube, and an output end of the rear guiding section is connected to a cooling medium output tube.
In an embodiment of the utility model, the front guiding section is embedded with an optical fiber inlet, the rear guiding section is embedded with an optical fiber outlet, and the optical fiber thermometer is arranged on the optical cable working section from the optical fiber inlet to the optical fiber outlet.
In an embodiment of the present invention, a regulating valve for controlling a flow rate of a cooling medium is disposed on the front guiding section of the optical fiber isolation protection tube.
In an embodiment of the utility model, the front guiding section and the rear guiding section are both provided with a high-precision thermometer for calibrating deviation of a temperature measuring working section of the optical fiber thermometer and a flowmeter for monitoring leakage of the optical fiber isolation protection tube
As described above, the protection device for an optical fiber thermometer according to the present invention has the following advantageous effects:
the optical fiber insulation protection tube with the cooling medium is added to the embedded optical fiber thermometer, the protection measure prolongs the aging process of the optical fiber material, avoids the temperature gradual change drift phenomenon of the linear temperature sensor, prolongs the service life of the optical fiber thermometer and improves the reliability and the practicability of the optical fiber thermometer.
Drawings
FIG. 1 is a schematic view of a conventional fiber optic thermometer according to the present invention;
FIG. 2 is a schematic view of a protection device for an optical fiber thermometer according to the present invention;
FIG. 3 is a schematic diagram illustrating calibration correction and mapping compensation of an optical fiber thermometer according to the present invention;
FIG. 4 is a diagram showing a method for correcting and compensating an optical fiber thermometer and a protection measure scheme according to the present invention.
Element number description:
1. in a furnace; 2. a furnace outer shell; 3. an optical fiber isolation protection tube; 31. a front guide section; 32. an optical cable working section; 33. a rear guide section; 4. a fiber optic thermometer; 5. a thermocouple thermometer; 6. adjusting a valve; 7. a high-precision thermometer; 8. a flow meter; 9. building bricks in the furnace; 10. the brick laying and material ramming gap.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The utility model is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
In industrial production, an optical fiber thermometer is arranged, and the safety is ensured by monitoring the temperature of a wall body with bricks in a furnace and observing the thickness change condition of the bricks in the later stage of production; according to the temperature field of the brickwork depicted by the optical fiber thermometer, the correlation is presented with the thickness change of the brickwork; generally, the higher the brickwork temperature, the greater the safety risk, and the weak the residual brickwork.
As shown in fig. 1, which is a schematic view of a laying mode of a conventional optical fiber thermometer, when a furnace body is newly built to lay refractory bricks, optical cables are buried in multiple layers along the gap 10 (shown in fig. 4) between the furnace outer shell 2 and a brick laying ramming material, the temperature of a brick laying wall body is monitored by using the optical fiber thermometer, and the change condition of the brick laying thickness in the production process is observed, so that the safety is ensured.
After new furnace equipment is put into operation, in the combustion atmosphere of 1 in the stove, the furnace body is built and is able to be continuously subjected to physical high temperature, chemical erosion, and the scouring of falling materials in the stove, and the bricks can be non-uniformly peeled off and thinned, so that the buried optical fiber thermometer can feel different temperature values, and weak parts which can form potential accidents are searched.
In the later stage of furnace service, the erosion line continues to be pushed, the furnace body is in the most dangerous condition, the working environment of the buried optical cable is also continuously deteriorated, only a coating, a wrapping protective sleeve or a braided sheath and the like are close to the bare optical fiber thermometer in the gap of the bricklaying material, for example, once the buried optical cable is heated and impacted, the buried optical cable is expanded, contracted, extruded, sheared and broken, or directly receives the physical high temperature and the chemical erosion of blast furnace gas, the fusion damage, the oxidation modification and the like are caused, the temperature sensing or the information transmission function is lost, the whole temperature measurement monitoring work is also interrupted, and the buried bare optical cable mode is extremely unfavorable for the subsequent safety because the buried optical cable cannot be laid and replaced again.
As shown in fig. 2, the optical fiber thermometer protection device (measure) according to the present invention is schematically configured, the optical fiber thermometer is more likely to fail at the later stage when the temperature is most required to be monitored, and in order to prevent the above situation, the present invention adopts a method of adding a protection measure in advance to the optical cable at the buried working section.
For example, the added safeguard is a safeguard of the optical fiber thermometer, which comprises: the optical fiber isolation protection tube 3 is internally sealed with flowing cooling medium, and the optical fiber thermometer is arranged in the medium of a cold area in the optical fiber isolation protection tube.
Specifically, an optical fiber outer protective tube (i.e., an optical fiber isolation protective tube) is configured during laying, the optical fiber isolation protective tube 3 is composed of a front guide section 31, an optical cable working section 32 and a rear guide section 33, the whole process is sealed by a hard material, and the optical fiber isolation protective tube is made of a metal material, for example, the optical fiber isolation protective tube has the function of isolating substance exchange inside and outside the tube besides heat conduction; the outer protective pipe adopts a steel pipe, a water gas black iron pipe, a plastic steel pipe and the like.
In the embodiment, the protection measure effectively avoids the phenomenon that the optical fiber material is accelerated to age under the severe working condition environment, such as acid and alkali, reducing atmosphere, high temperature and high pressure and the like, and simultaneously avoids the phenomenon that the optical fiber thermometer is easy to break due to fragility, thereby greatly prolonging the service life of the optical fiber thermometer.
The utility model provides a fiber thermometer calibration method flow chart, which comprises the following steps:
step S1, the optical fiber thermometer is arranged in an optical fiber isolation protection tube with a cooling medium;
specifically, aiming at the optical cable at the temperature measurement working section of the optical fiber thermometer, an optical fiber isolation protection tube is provided to prevent the optical cable from being broken by external force and contacting chemical corrosion; for example, the optical fiber thermometer can be cooled by flowing cooling medium, so that the optical fiber thermometer is prevented from being aged or damaged due to overhigh temperature in the furnace; in the optical fiber isolation protection tube, a cooling medium is connected for cooling, and the risk of high-temperature fusing and rapid aging of the temperature measurement optical cable is relieved.
Step S2, respectively collecting the temperature under the same cooling medium by using a high-precision thermometer and an optical fiber thermometer, calculating the temperature difference between the high-precision thermometer and the optical fiber thermometer, obtaining the calibration coefficient of the optical fiber thermometer by using the temperature difference, and correcting the temperature deviation caused by the optical fiber thermometer according to the calibration coefficient;
specifically, the temperature collected by the high-precision thermometer is used as a reference value (i.e. as a calibration reference), and the temperature difference between the high-precision thermometer and the optical fiber thermometer under the same cooling medium is calculated, for example, the temperature difference between the high-precision thermometer and the optical fiber thermometer has the same temperature difference value when the high-precision thermometer and the optical fiber thermometer contact the same cooling medium at the same detection position, but when the high-precision thermometer and the optical fiber thermometer detect the temperature difference value differently, the temperature difference of the high-precision thermometer is used as the calibration value and compared with the temperature difference of the optical fiber thermometer to obtain the temperature difference, the calibration coefficient of the optical fiber thermometer is obtained by using the temperature difference, and the creep degradation amount of the optical fiber thermometer is corrected at any time by using the calibration coefficient.
And step S3, collecting the temperature of the bricks on the periphery of the optical fiber isolation protection tube by using a thermocouple thermometer, forming a heat conduction blocking space compensation coefficient between the optical fiber thermometer and the thermocouple thermometer according to the temperature inside and outside the optical fiber isolation protection tube, and correcting the temperature value of the optical fiber thermometer again by using the heat conduction blocking space compensation coefficient.
Specifically, the temperature of the brickwork is detected by a thermocouple thermometer to be used as a reference point, and the temperature of the optical fiber in the isolation protection tube and the temperature of the brickwork at the periphery of the isolation protection tube are mapped to obtain a heat conduction blocking space compensation relation;
a traditional thermocouple thermometer is buried, the temperature of the brick built on the periphery of the optical fiber isolation protection tube collected by the thermocouple thermometer is used as a reference point, the reference point is compared with the temperature rise increment value of the optical fiber thermometer closest to the thermocouple thermometer, the heat conduction blocking space migration relation between the optical fiber thermometer and the thermocouple is mapped, and heat conduction loss caused by the optical fiber isolation protection tube is compensated.
In this embodiment, the temperature distribution field of the brickwork in the furnace is depicted according to the continuous and multi-point temperature measurement values obtained by the optical fiber thermometer, for example, after the creep degradation of the optical fiber thermometer is corrected at any time by deviation and the thermal conduction separation space between the optical fiber thermometer and the thermocouple is migrated and compensated through the optical fiber isolation protection tube and the cooling protection, the temperature distribution field mapped by the brickwork in the furnace at the periphery of the optical fiber isolation protection tube can be directly depicted according to the continuous and multi-point temperature measurement values on the whole working section of the directly obtained optical fiber thermometer.
In this embodiment, as shown in fig. 3, the schematic diagram of calibration correction and mapping compensation of the fiber thermometer includes: a high-precision thermometer 7 and a cooling medium flowmeter 8 are respectively arranged on a front guide section 31 and a rear guide section 33 of the optical fiber isolation protection tube 3, an optical cable 32 at a working section is led out to form a hole, the high-precision thermometer has the function of calibrating the deviation of the temperature measurement working section of the optical cable, and the cooling medium flowmeter 8 arranged at an inlet and an outlet has the function of monitoring the leakage of the optical fiber isolation protection tube.
On the front guide section 31 and the rear guide section 33, the flow of the cooling medium is controlled through the regulating valve, and the cooling intensity of the cooling medium is controlled.
Flowing cooling media such as cold air, cold water, cooling liquid, oil and the like are connected into the optical fiber isolation protection tube 3, so that the optical cable at the working section soaked in the cooling media is integrally cooled, and the working environment is improved.
In the safeguard measure in this embodiment, to bare optical cable, provide optic fibre isolation protection tube and cooling protection, realize keeping apart abominable operating mode environment, prevent optical cable external force rupture, contact chemical corrosion, alleviate temperature measurement optical cable high temperature fusing, quick ageing risk, be favorable to prolonging optical fiber thermometer life.
The optical cable can accurately distinguish and position the temperature position according to the light speed and the feedback time, namely, the optical fiber thermometer can obtain a point temperature value every 0.3m, and then can obtain a continuous and multi-point temperature value.
Since the optical fiber thermometer will decline with the passage of time, the aging process of the optical fiber material gradually causes the migration of optical frequency or the absorption, dissipation, etc., the linear temperature sensor has the gradual drift phenomenon of the extracted temperature value, in other words, the temperature measurement performance may change in comparison with the last year, and needs to be calibrated continuously.
When the optical cable is still outside the furnace, but the optical cable penetrates through the optical fiber isolation protection tube and is completely contacted with a cooling medium in the tube, and high-precision thermometers are respectively arranged on the front guide section and the rear guide section and just belong to the same temperature difference section.
The high-precision thermometer and the optical fiber thermometer have equal temperature difference values when contacting the same cooling medium at the same detection position on the front guide section and the rear guide section outside the temperature measurement working area of the optical fiber thermometer. If the temperatures detected by the two are different, the temperature difference of the high-precision thermometer is used as a calibration value, and compared with the temperature difference of the optical fiber thermometer, the creep degradation amount of the optical fiber thermometer is corrected at any time. The high-precision thermometer and the optical fiber thermometer are in and out temperature difference interaction relation: TB-TA. alpha. x (TEB-TEA)
Namely:
wherein: TB-TA is a temperature difference calibration value of the position where the high-precision thermometer enters and exits the optical fiber isolation protection tube, TEB-TEA is a temperature value detected by the same position where the optical fiber thermometer enters and exits the optical fiber isolation protection tube, and alpha is a deviation correction coefficient of the optical fiber thermometer which decays along with time.
In a broadening way, the optical fiber thermometers which are already in the optical fiber isolation protection tube in the furnace have similar creep drift characteristics, are in contact with cooling media in the tube, have almost the same environment and almost the same aging process, and count the i-point temperature value TE through the calibrated optical fiber thermometers1～TEiThe flow direction of the cooling medium along the rear edge after correction at any time is expressed in sequence as follows: α TEA, α TE1……αTEi-1、αTEi、αTEB。
The time calibration method calibrates the creep degradation deviation, and the optical fiber thermometer degradation deviation correction coefficient alpha value is a proportional coefficient fluctuating along with time and is obtained by real-time comparison calculation between a high-precision thermometer and an optical fiber thermometer.
The optical fiber thermometer is completely arranged in the optical fiber isolation protection tube, the contact is that the cooling medium circulates in the tube, the detected temperature is the condition that the temperature of the cooling medium is gradually increased after the cooling medium is heated by heat flow in the furnace, and although the optical fiber thermometer is embedded in the furnace, the temperature of brickwork in the furnace is not directly reflected.
Additionally, one or a plurality of redundant traditional thermocouple thermometers are buried, the temperature of the brick laid on the periphery of the optical fiber isolation protection tube is directly detected to be used as a reference point, the reference point is compared with the temperature rise increment value of the optical fiber thermometer closest to the thermocouple, the heat conduction blocking space migration relation between the optical fiber thermometer and the thermocouple is mapped, and heat conduction loss caused by the optical fiber isolation protection tube is compensated.
For example, the temperature of the outer brickwork is high, which causes the temperature in the pipe to rise rapidly; thermocouple detection brick temperature TT, temperature increment part TE after optical fiber thermometer rectificationm+1-TEmMapping barrier space migration compensation relation: TT ═ β × [ α (TE)m+1-TEm)]
Namely:
wherein: TT is the temperature value detected by the thermocouple of the brick built at the periphery of the optical fiber isolation protection tube, alpha TEmAnd alpha TEm+1And detecting the front and back temperature values of the cooling medium by the optical fiber thermometer closest to the thermocouple TT, wherein beta is a heat conduction blocking space compensation coefficient between the optical fiber thermometer and the thermocouple.
To be generalized, the fiber thermometer already in the fiber isolation protection tube in the furnace has a similar heat dissipation spatial relationship with the thermocouple, and is finally mapped into the i-point temperature value α β TE of the total brickwork in the furnace1～αβTEiThe values are expressed in the cooling medium flow direction in order: alpha beta TE1……αβTEm、αβTEm+1……αβTEn、αβTEn+1……αβTEi。
According to the space calibration method, heat loss space is formed after heat flow is blocked by multiple layers to form temperature difference gradient, and the compensation coefficient beta value of the heat conduction blocking space between the optical fiber thermometer and the thermocouple is a variable quantity related to the residual thickness of bricks in a furnace, the heat exchange strength of cooling media in the optical fiber isolation protection tube and the like, and can be obtained by reference to comparison calculation between the thermocouple thermometer and the optical fiber thermometer.
In other embodiments, as shown in FIG. 4, the optical fiber thermometer correction, compensation method and safeguard scheme is shown as follows:
in order to facilitate understanding, in the same temperature difference section of the head and the tail of the optical fiber isolation protection tube, the temperature difference inlet and outlet calibration value TB-TA of the high-precision thermometer is known, and at the moment, the temperature difference inlet and outlet detection value TEB-TEA of the corresponding optical fiber thermometer is obtained; aligning according to a high-precision temperature difference calibration value under the condition that two temperature difference values shown in the figure are different: TB-TA ═ alpha x (TEB-TEA), the first step of calibration and comparison is calculated to obtain the decay random deviation correction coefficient of the optical fiber thermometer:
the calibrated alpha coefficient is expanded, and on all fiber thermometers, as shown in FIG. 4, after the creep drift is corrected by m, m +1, n and n +1 points, the temperature value alpha TEA … … alpha TE is calibrated at any timem、αTEm+1……αTEn、αTEn+1……αTEi、αTEB。
The heat flow transmission path in the furnace is as follows: residual brick laying in the furnace, material tamping at the brick laying interval, optical fiber isolation protection tube wall, cooling medium in the tube and an optical fiber thermometer; therefore, the heat flow transfer path is long, variable factors are more after heat insulation layer by layer, the temperature value of the optical fiber thermometer is greatly lower than the temperature of the brickwork in the furnace, the optical fiber temperature value is corresponding to the temperature of the brickwork in the furnace by adopting a theoretical calculation method, and the processing difficulty is high.
In addition, a traditional thermocouple thermometer is embedded to exactly correspond to the temperature alpha TE of the optical fibermAnd alpha TEm+1In the peripheral brickwork, a thermocouple detects the temperature TT of the brickwork in the furnace, and a mapping relation is established according to the temperature TT: TT ═ β × [ α (TE)m+1-TEm)]＝αβ(TEm+1-TEm) And the second step of comparing and calculating to obtain the heat conduction blocking space migration compensation coefficient between the optical fiber thermometer and the thermocouple:
the mapped beta coefficient is expanded, and on all the optical fiber thermometers, as shown in fig. 4, after the (m and m +1), (n and n +1) dot brick maps the heat blocking dissipation, the compensation temperature value sequentially expresses … … alpha beta (TE)m+1-TEm)……αβ(TEn+1-TEn) … …, i.e. the bricklaying map temperature expression for any point n:
TTn＝αβ(TEn+1-TEn)
wherein TTnThe mapping temperature of the bricks built in the furnace at the periphery of the optical fiber isolation protection tube is represented, n represents any mapping point in the temperature values of the total points i, and m represents a designated point on the optical fiber thermometer which is close to the thermocouple thermometer and is selected as the actually measured heat conduction blocking dissipation spatial relation.
In this embodiment, the optical fiber thermometer adopts a space-time calibration method, a high-precision thermometer and a thermocouple thermometer are introduced as calibration sources respectively, creep decay random deviation correction and heat conduction separation space migration compensation between the optical fiber thermometer and the thermocouple are performed on the optical fiber thermometer, and continuous and multi-point temperature measurement values (TE) on the whole working section of the known optical fiber thermometer are realizedn+1-TEn) Namely, the temperature rise difference between the front temperature rise and the rear temperature rise can directly describe the temperature distribution field TT mapped by the brick built in the furnace at the periphery of the optical fiber isolation protection tuben。
In conclusion, the optical fiber isolation protection tube with the cooling medium is added to the embedded optical fiber thermometer, the protection measure prolongs the aging process of the optical fiber material, avoids the temperature gradual change drift phenomenon of the linear temperature sensor, prolongs the service life of the optical fiber thermometer and improves the reliability and the practicability of the optical fiber thermometer. Therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the utility model. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (7)
1. A protective device for a fiber optic thermometer, comprising: the optical fiber isolation protection tube is internally sealed with flowing cooling medium, and the optical fiber thermometer is arranged in the medium of a cold area in the optical fiber isolation protection tube.
2. The protection device of the optical fiber thermometer according to claim 1, wherein the optical fiber insulation protection tube is annularly arranged along the outer wall of the furnace body.
3. A protection device of a fiber optic thermometer according to claim 1 or 2, characterized in that said fiber optic insulating protection tube is a heat conducting metal tube.
4. The protection device for optical fiber thermometer of claim 1, wherein the optical fiber insulation protection tube comprises a front guiding section, an optical cable working section and a rear guiding section which are connected into a whole, wherein the input end of the front guiding section is connected with a cooling medium input tube, and the output end of the rear guiding section is connected with a cooling medium output tube.
5. The protection device of an optical fiber thermometer according to claim 4, characterized in that the front guiding section is embedded with an optical fiber inlet, the rear guiding section is embedded with an optical fiber outlet, and the optical fiber thermometer is arranged on the optical cable working section from the optical fiber inlet to the optical fiber outlet.
6. A protection device of an optical fiber thermometer according to claim 4 or 5, characterized in that a regulating valve for controlling the flow of the cooling medium is provided on the front guiding section of the optical fiber isolation protection tube.
7. The protection device for optical fiber thermometer according to claim 4 or 5, wherein the front and rear guiding segments are each provided with a high precision thermometer for calibrating the deviation of the temperature measuring working segment of the optical fiber thermometer and a flow meter for monitoring the leakage of the optical fiber isolation protection tube.
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