CN101571428A - Multi-function sensor and heat current and temperature measuring method under high temperature - Google Patents

Abstract

The invention discloses a multi-function sensor and a heat current and temperature measuring method under high temperature, wherein the multi-function sensor comprises a shell and a heat current measuring head, the heat current measuring head is arranged on the shell and comprises a heat current probe and a heat sink, the heat sink and the heat current probe are connected and holded in the shell to form a thermoelectric couple with the heat current probe, a cooling device used for cooling the heat current measuring head and another thermoelectric couple used for measuring the temperature of the heat sink are also arranged in the shell, the two thermoelectric couples are connected with a surveymeter, and the detection of heat current and temperature is realized by measuring the voltage signal of the two thermoelectric couples. In the measuring method disclosed by the invention, a mathematical model is built to derive and obtain high temperature to be measured by measuring low temperature. The multi-function sensor of the invention can measure heat current and temperature in high temperature environment, overcomes the problem that temperature can not be measured under high temperature environment when the original thermoelectric couple is more than 2000K; not only can the heat current be measured, but also the thermoelectric couple can be ensured to work under high temperature environment, thus the temperature is effectively measured.

Description

Multifunction Sensor and high temperature are measured hot-fluid and method of temperature down

Technical field

The present invention relates to the device and method of a kind of wall hot-fluid and temperature simultaneously measuring.

Background technology

The method of heat flow measurement at present mainly contains film thermocouple, Smith type heat flux sensor etc.The film thermocouple response time is short, be fit to measure the transient heat conductive process, but the temperature range of its institute's energy measurement is limited, burns out easily during high temperature.Smith type heat flux sensor signal is stronger, can be high temperature resistant, but the response time is longer, and complex manufacturing technology, need be on ceramic wafer copper facing and constantan circuit, equipment is relatively more expensive.The common usefulness of temperature survey be thermopair, but the operating temperature range of thermopair usually below 1300K, in the environment of higher temperature, thermopair can't be survived.For the scramjet engine of hypersonic aircraft, firing chamber air-flow environment is very abominable, and more than 2000K, hot-fluid reaches 1MW/m to temperature usually ², thermopair is easy to damage under this environment, can't measure wall hot-fluid and temperature.

Summary of the invention

At the problem that prior art exists, one of purpose of the present invention is to provide a kind of high temperature resistant, the sensor that can measure hot-fluid and temperature simultaneously.

Another object of the present invention is to provide and measure hot-fluid and method of temperature under a kind of hot environment.

Multifunction Sensor of the present invention, comprise shell and hot-fluid gauge head, the hot-fluid gauge head is set on the shell, the hot-fluid gauge head comprises hot-fluid probe and heat sink, the hot-fluid probe is arranged on housing exterior, heat sink linking to each other with the hot-fluid probe is contained in enclosure and hot-fluid probe composition thermopair, also be provided with another thermopair that is used to cool off the cooling device of hot-fluid gauge head and is used to measure heat sink temperature in the described shell, two thermopairs link to each other with detector, realize the detection of hot-fluid and temperature by the voltage signal of measuring two thermopairs.

Further, described hot-fluid probe is the constantan sheet, described heat sink for the cross section be annular copper cylinder, the annular end face welding that the edge of constantan sheet and copper are heat sink, a copper conductor is drawn at the center of constantan sheet, draws another root copper conductor on the copper cylinder, and described detector is connected between two copper conductors.

Further, described hot-fluid probe and heat sink material are the material that nickel chromium triangle-nisiloy or platinum rhodium 13-platinum or platinum rhodium 10-platinum or platinum rhodium 30-platinum rhodium 6 can be formed thermopair.

Further, described heat sink being assemblied on the matrix that is provided with in the described shell, matrix welds with shell, and described cooling device is the tank that is provided with between matrix and the shell, and described another thermopair is arranged on the matrix or on heat sink.

Further, ccontaining cooling water pipe in the described tank, cooling water pipe one end is welded on the described matrix, and the adapter that the other end is provided with links to each other with water supply installation.

Further, described hot-fluid probe top is provided with thermal insulation ceramics, smears heat-conducting silicone grease on the surface of contact of thermal insulation ceramics and hot-fluid probe.

Measure hot-fluid and method of temperature under the hot environment of the present invention: may further comprise the steps: 1) adopt said apparatus to measure the voltage signal of the thermopair of hot-fluid probe and heat sink composition, pass through formula $\frac{E}{q}=4.37\&times;{10}^{-4}\&CenterDot;\frac{R^2}{S},$ Can get hot-fluid, wherein E is that voltage, q are that hot-fluid, R are that radius, the S that hot-fluid is popped one's head in is the thickness of hot-fluid probe; 2) measure the low-temperature space temperature at the heat sink place of heat conducting element by heat conduction formula T _h-T _l=Δ T, $\mathrm{\&Delta;T}={\mathrm{\&Delta;<figure-callout\; id="1"\; label="T"\; filenames="A20091008536700131.png,A20091008536700151.png"\; state="\{\{state\}\}">T</figure-callout>}}_1+\mathrm{\&Delta;}{\mathrm{<figure-callout\; id="2"\; label="T"\; filenames="A20091008536700131.png,A20091008536700142.png"\; state="\{\{state\}\}">T</figure-callout>}}_2=q\&CenterDot;\frac{l_1}{k_1{\mathrm{<figure-callout\; id="1"\; label="A"\; filenames="A20091008536700131.png,A20091008536700151.png"\; state="\{\{state\}\}">A</figure-callout>}}_1}+q\&CenterDot;\frac{1}{2\mathrm{\&pi;}{d}_2{\mathrm{<figure-callout\; id="2"\; label="k"\; filenames="A20091008536700131.png,A20091008536700142.png"\; state="\{\{state\}\}">k</figure-callout>}}_2}$ Obtain the temperature of hot-fluid probe high-temperature region, wherein T _hBe the temperature of hot-fluid probe, T _lBe matrix or heat sink temperature, Δ T ₁Be the temperature difference at thermal insulation ceramics two ends, Δ T ₂Be the temperature difference of hot-fluid center probe and edge, q is the hot-fluid at hot-fluid probe place, R ₁Be the thermal resistance of thermal insulation ceramics, R ₂Be the thermal resistance of hot-fluid probe, l ₁Be the thickness of thermal insulation ceramics, k ₁Be the coefficient of heat conductivity of hot-fluid probe, A ₁Be hot-fluid probe area of section, d ₂Be the thickness of hot-fluid probe, k ₂Coefficient of heat conductivity for the hot-fluid probe.

Multifunctional heating sensor of the present invention can be measured hot-fluid and temperature under hot environment, remedy original thermopair and under the above hot environment of 2000K, can't measure the problem of temperature, can either measure hot-fluid, can guarantee that again thermopair can operate as normal under hot environment, effectively measure temperature.The present invention can be used for the measurement of scramjet engine firing chamber internal face hot-fluid and wall surface temperature, the hot-fluid of the hot-fluid of industry heating furnace internal faces such as metallurgy, boiler and the measurement of temperature and various miniwatt firing equipments, temperature survey etc.

Description of drawings

Fig. 1 is the structural representation of hot-fluid probe of the present invention;

Fig. 2 is the front view of Multifunction Sensor of the present invention;

Fig. 3 is the vertical view of Multifunction Sensor of the present invention;

Fig. 4 is hot-fluid, the temperature survey key diagram of Multifunction Sensor of the present invention;

Fig. 5 a is the heat sink connected mode synoptic diagram of constantan sheet and copper;

The synoptic diagram that Fig. 5 b pops one's head in for the hot-fluid of the present invention that the forging and pressing of constantan sheet constitute on copper is heat sink;

Fig. 6 records hot-fluid-temperature response curve for experiment;

Fig. 7 is for handling the hot-fluid-temperature difference relation curve that obtains;

Fig. 8 a is for cooling off conduit along circumferential stretch-out view;

Fig. 8 b is for being cooling conduit synoptic diagram.

Embodiment

As illustrated in fig. 1 and 2, Multifunction Sensor of the present invention, comprise stainless steel casing 3, the hot-fluid gauge head is set on the stainless steel casing 3, the hot-fluid gauge head comprises constantan sheet 2 that is arranged on stainless steel casing 3 outsides and the copper heat sink 4 that is arranged in the stainless steel casing 3, shown in Fig. 5 a, constantan sheet 2 is pressed into the cap shape, and fastening is used copper band 11 bandings again at the edge of copper heat sink 4, obtains the hot-fluid gauge head shown in Fig. 5 b, constantan sheet 2 links to each other with copper heat sink 4 and constitutes copper-constantan thermocouple, copper conductor 10 of center welding of constantan sheet 2, and guarantee copper conductor 10 perpendicular to constantan sheet 2, and contact for point with constantan sheet 2 centers, the solder joint contact is good, and intensity is enough.Copper conductor 10 passes the center pit of copper heat sink 4, copper is heat sink 4 to be installed on the copper matrix 6, at copper matrix 6 afterbodys the brass screws 8 of one piece of M4, the through hole of a Φ 2 of brass screws 8 centre drills is installed, make central copper lead 10 can pick out from the hole, central copper lead 10 is the positive pole of heat flux sensor.Draw another root copper conductor from brass screws 8 roots, as the negative pole of heat flux sensor.

In addition, be used to measure the copper-constantan thermocouple of hot-fluid, can use other any material that can form thermopair, for example nickel chromium triangle-nisiloy, platinum rhodium 13-platinum, platinum rhodium 10-platinum, platinum rhodium 30-platinum rhodium 6 etc.

Multifunction Sensor heat flow measurement principle of the present invention is as follows: when evenly hot-fluid is perpendicular to the incident of constantan sheet, because the constantan sheet is extremely thin, the temperature difference of front/rear end can be ignored basically, adopt the one dimension heat transfer theory to analyze, hot-fluid is moving by middle mind-set marginal flow in constantan sheet inside, makes center and edge produce a temperature difference like this; Center and edge are respectively a copper-constantan thermocouple, have so just constituted a pair of temperature difference heat galvanic couple, when constantan sheet center and peripheral produces temperature difference, just can be between two-stage bad student's electric potential difference.Therefore, by measuring this electric potential difference, just can access the heat flow value on constantan sheet surface.The voltage of the heat flow meter that Gardon derives in his document-hot-fluid relation is as follows: $\frac{E}{q}=4.37\&times;{10}^{-4}\&CenterDot;\frac{R^2}{\mathrm{<figure-callout\; id="1"\; label="S"\; filenames="A20091008536700131.png,A20091008536700151.png"\; state="\{\{state\}\}">S</figure-callout>}}$ ①

Wherein, E is a voltage, and q is a hot-fluid, and R is the radius of constantan sheet, and S is a thickness, all adopts International System of Units.By 1. formula as can be seen, the output voltage E of heat flow meter and hot-fluid q to be measured are linear, and linear coefficient is only relevant with the size of constantan sheet.

Through theoretical analysis, in certain temperature range (between 300K～800K), the linearity of Gardon heat flow meter is very good.Therefore, as long as the operating ambient temperature of assurance Gardon heat flow meter in allowed limits, just can measure the exact value of hot-fluid.

The response time relational expression of Gardon heat flow meter is:

τ ₀＝3.7R ² ②

Wherein, τ ₀Be the temporal characteristics constant, R is the radius of constantan sheet.By 2. formula as can be seen, the response time of Gardon heat flow meter and constantan sheet radius square is directly proportional.Generally, radius is more little, and the response time is short more; But, according to 1. formula, the output signal strength of heat flow meter again with square being directly proportional of radius, radius is big more, signal is strong more.Therefore, in order to reach the purpose of optimal design, guaranteeing that heat flow meter has under the situation of certain signal intensity and manufacture craft permission, should reduce the radius of constantan sheet as much as possible.

Shown in Fig. 8 a and 8b, on copper matrix 6, mill out the rectangular channel of 2mm * 2mm, as the chilled water conduit.With copper matrix 6 and shell 3 welding, welding technology is silver soldering, and the cooling water pipe 9 of two diameter 3mm of afterbody welding guarantees sealing.In cooling water pipe 9 ends adapter is installed, so that link to each other water filling in cooling water pipe 9 with the plastic cool water pipe of 6mm.The copper conductor that copper conductor of drawing from constantan sheet 2 centers and brass screws root are drawn is fixed on the cooling water pipe 9, prevents that pine is disconnected.

As shown in Figure 1, constantan sheet 2 is ablated when preventing high temperature, and the fluoran stream surface of constantan sheet 2 is provided with boron nitride thermal insulation ceramics 1, smears heat-conducting silicone grease on the surface of contact of boron nitride thermal insulation ceramics 1 and constantan sheet 2, rise and improve the heat conduction rate action, can also play certain fixation.Adopting the purpose of pottery is to play insulating effect, uses the boron nitride processable ceramic here, and its hardness is little, can carry out machining, and the coefficient of heat conductivity height is so the heat conducting response time is short.

As shown in Figure 2, copper matrix 6 inside of Multifunction Sensor of the present invention also are provided with the thermocouple hole 7 of ccontaining K type thermopair, be used to measure the temperature of the copper matrix 6 of cooling, thermocouple hole 7 also can be arranged in the copper heat sink 4 in addition, and K type thermopair is placed on the temperature that is used to measure copper heat sink 4 in the copper heat sink 4.By measuring the low temperature of copper matrix 6 or copper heat sink 4, the counter high temperature of releasing constantan sheet 2 places can guarantee that so K type thermopair can at high temperature not damage.

Multifunction Sensor temperature survey principle of the present invention is as follows:

Temperature survey is according to Fourier's one dimension heat conduction law.The hot-fluid of head high-temperature region arrives the heat flux sensor matrix through boron nitride thermal insulation ceramics and constantan sheet, and the heat conduction formula is as follows:

T _h-T _l＝ΔT ③

$\mathrm{\&Delta;T}={\mathrm{\&Delta;<figure-callout\; id="1"\; label="T"\; filenames="A20091008536700131.png,A20091008536700151.png"\; state="\{\{state\}\}">T</figure-callout>}}_1+{\mathrm{\&Delta;<figure-callout\; id="2"\; label="T"\; filenames="A20091008536700131.png,A20091008536700142.png"\; state="\{\{state\}\}">T</figure-callout>}}_2=\mathrm{<figure-callout\; id="1"\; label="q\; R"\; filenames="A20091008536700131.png,A20091008536700151.png"\; state="\{\{state\}\}">q</figure-callout>}{R}_{}{}_1+\mathrm{<figure-callout\; id="2"\; label="q\; R"\; filenames="A20091008536700131.png,A20091008536700142.png"\; state="\{\{state\}\}">q</figure-callout>}{R}_{}{}_2=q\&CenterDot;\frac{l_1}{k_1{\mathrm{<figure-callout\; id="1"\; label="A"\; filenames="A20091008536700131.png,A20091008536700151.png"\; state="\{\{state\}\}">A</figure-callout>}}_1}+q\&CenterDot;\frac{1}{2\mathrm{\&pi;}{d}_2{\mathrm{<figure-callout\; id="2"\; label="k"\; filenames="A20091008536700131.png,A20091008536700142.png"\; state="\{\{state\}\}">k</figure-callout>}}_2}$ ④

3., 4. in two formulas, T _hBe sensor head high temperature, T _lBe copper matrix 6 low temperature, Δ T ₁Be the temperature difference at heat insulation boron nitride ceramics 1 two ends, Δ T ₂Be the temperature difference of constantan sheet 2 centers and edge, q is the head hot-fluid of hot-fluid gauge head, R ₁Be the thermal resistance of thermal insulation ceramics 1, R ₂Be the thermal resistance of constantan sheet 2, l ₁Be the thickness of thermal insulation ceramics 1, k ₁Be the coefficient of heat conductivity of thermal insulation ceramics 1, A ₁Be the area of thermal insulation ceramics 1, d ₂Be the thickness of constantan sheet 2, k ₂Coefficient of heat conductivity for constantan sheet 2.Because R ₁, R ₂Composition parameter can consult physical parameter and draw, can be considered known, therefore can be according to measuring hot-fluid q and substrate temperature T _lThe anti-portion's temperature T of cutting somebody's hair _h

Hot-fluid gauge head head thermal resistance coupling is calculated, and purpose is to determine the head dimensions of Gardon hot-fluid gauge head and the radius and the thickness of boron nitride thermal insulation ceramics 1.If axially thermal resistance is R ₁, radially thermal resistance is R ₂, as far as possible little in order to guarantee the water-cooled effect to the influence that heat flow signal causes, should allow the thermal resistance of both direction identical as far as possible.Axially thermal resistance and radially the computing formula of thermal resistance distinguish as follows:

${\mathrm{<figure-callout\; id="1"\; label="R"\; filenames="A20091008536700131.png,A20091008536700151.png"\; state="\{\{state\}\}">R</figure-callout>}}_1={{\mathrm{<figure-callout\; id="1"\; label="R"\; filenames="A20091008536700131.png,A20091008536700151.png"\; state="\{\{state\}\}">R</figure-callout>}}_1}^{\&prime;}+{{\mathrm{<figure-callout\; id="1"\; label="R"\; filenames="A20091008536700131.png,A20091008536700151.png"\; state="\{\{state\}\}">R</figure-callout>}}_1}^{\&prime;\&prime;}=\frac{{{\mathrm{<figure-callout\; id="1"\; label="l"\; filenames="A20091008536700131.png,A20091008536700151.png"\; state="\{\{state\}\}">l</figure-callout>}}_1}^{\&prime;}}{{{\mathrm{<figure-callout\; id="1"\; label="k"\; filenames="A20091008536700131.png,A20091008536700151.png"\; state="\{\{state\}\}">k</figure-callout>}}_1}^{\&prime;}{A_1}^{\&prime;}}+\frac{1}{2\mathrm{\&pi;}{{\mathrm{<figure-callout\; id="1"\; label="S"\; filenames="A20091008536700131.png,A20091008536700151.png"\; state="\{\{state\}\}">S</figure-callout>}}_1}^{\&prime;\&prime;}{{\mathrm{<figure-callout\; id="1"\; label="k"\; filenames="A20091008536700131.png,A20091008536700151.png"\; state="\{\{state\}\}">k</figure-callout>}}_1}^{\&prime;\&prime;}}$ ⑤

${\mathrm{<figure-callout\; id="2"\; label="R"\; filenames="A20091008536700131.png,A20091008536700142.png"\; state="\{\{state\}\}">R</figure-callout>}}_2={{\mathrm{<figure-callout\; id="2"\; label="R"\; filenames="A20091008536700131.png,A20091008536700142.png"\; state="\{\{state\}\}">R</figure-callout>}}_2}^{\&prime;}+{{\mathrm{<figure-callout\; id="2"\; label="R"\; filenames="A20091008536700131.png,A20091008536700142.png"\; state="\{\{state\}\}">R</figure-callout>}}_2}^{\&prime;\&prime;}+{{\mathrm{<figure-callout\; id="2"\; label="R"\; filenames="A20091008536700131.png,A20091008536700142.png"\; state="\{\{state\}\}">R</figure-callout>}}_2}^{\&prime;\&prime;\&prime;}=\frac{1}{2\mathrm{\&pi;}{{\mathrm{<figure-callout\; id="2"\; label="S"\; filenames="A20091008536700131.png,A20091008536700142.png"\; state="\{\{state\}\}">S</figure-callout>}}_2}^{\&prime;}{{\mathrm{<figure-callout\; id="2"\; label="k"\; filenames="A20091008536700131.png,A20091008536700142.png"\; state="\{\{state\}\}">k</figure-callout>}}_2}^{\&prime;}}+\frac{{{\mathrm{<figure-callout\; id="2"\; label="l"\; filenames="A20091008536700131.png,A20091008536700142.png"\; state="\{\{state\}\}">l</figure-callout>}}_2}^{\&prime;\&prime;}}{{{\mathrm{<figure-callout\; id="2"\; label="k"\; filenames="A20091008536700131.png,A20091008536700142.png"\; state="\{\{state\}\}">k</figure-callout>}}_2}^{\&prime;\&prime;}{A_2}^{\&prime;\&prime;}}+\frac{{{\mathrm{<figure-callout\; id="2"\; label="l"\; filenames="A20091008536700131.png,A20091008536700142.png"\; state="\{\{state\}\}">l</figure-callout>}}_2}^{\&prime;\&prime;\&prime;}}{{{\mathrm{<figure-callout\; id="2"\; label="k"\; filenames="A20091008536700131.png,A20091008536700142.png"\; state="\{\{state\}\}">k</figure-callout>}}_2}^{\&prime;\&prime;\&prime;}{A_2}^{\&prime;\&prime;\&prime;}}$ ⑥

3. 4. in two formulas: R ₁' be the thermal resistance of boron nitride ceramics 1, R ₁" be the thermal resistance of constantan sheet 2, R ₂' be the head circle centre position thermal resistance of stainless steel casing 3, R ₂" and R ₂' " be the part thermal resistance of stainless steel casing 3, other parameters are respectively the physical parameter of these structure thermal resistances, can draw by tabling look-up.

Bring numerical optimization into and calculate, determine that finally each modular construction is of a size of: constantan sheet 2 radiuses are 6mm, and the thermal insulation ceramics radius is 6mm, and thickness is 2mm.

Shown in Fig. 6 and 7, demarcate hot-fluid temperature difference relation curve.The heat flux sensor head is closely contacted with the high temperature copper billet, measure head, hot-fluid, cooling substrate temperature simultaneously, then the hot-fluid and the temperature difference are depicted as curve, can see that hot-fluid-temperature difference relation is linear basically.Fig. 6 is the hot-fluid q of record, temperature T ₁, T ₂Response curve in time, Fig. 7 is hot-fluid q and temperature difference Δ T=T ₁-T ₂Between relation curve.Relational expression is as follows:

q＝C(T ₁-T ₂) ⑦

Slope of a curve is exactly calibration coefficient C, obtains after the derivation:

${\mathrm{<figure-callout\; id="1"\; label="T"\; filenames="A20091008536700131.png,A20091008536700151.png"\; state="\{\{state\}\}">T</figure-callout>}}_1={\mathrm{<figure-callout\; id="2"\; label="T"\; filenames="A20091008536700131.png,A20091008536700142.png"\; state="\{\{state\}\}">T</figure-callout>}}_2+\frac{\mathrm{<figure-callout\; id="8"\; label="q\; C"\; filenames="A20091008536700151.png"\; state="\{\{state\}\}">q</figure-callout>}}{C}$ ⑧

Therefore can be according to this relational expression, after again coefficient C being demarcated, just can be by measuring copper matrix or copper heat sink temperature and the hot-fluid head temperature of deriving simultaneously.

Heat flow signal is by copper conductor 10 outputs, and signal intensity is the millivolt magnitude.What the thermopair in the thermocouple hole 7 was exported also is the voltage signal of millivolt magnitude.Therefore Multifunction Sensor of the present invention also should be furnished with two millivolt detectors, for example multimeter, signals collecting instrument etc.

It is to be noted any distortion of making according to the specific embodiment of the present invention, all do not break away from the protection domain of spirit of the present invention and claim.

Claims (7)

1. Multifunction Sensor, it is characterized in that, comprise shell and hot-fluid gauge head, the hot-fluid gauge head is set on the shell, the hot-fluid gauge head comprises hot-fluid probe and heat sink, the hot-fluid probe is arranged on housing exterior, heat sink linking to each other with the hot-fluid probe is contained in enclosure and hot-fluid probe composition thermopair, also be provided with another thermopair that is used to cool off the cooling device of hot-fluid gauge head and is used to measure heat sink temperature in the described shell, two thermopairs link to each other with detector, realize the detection of hot-fluid and temperature by the voltage signal of measuring two thermopairs.

2. Multifunction Sensor as claimed in claim 1, it is characterized in that, described hot-fluid probe is the constantan sheet, described heat sink for the cross section be the annular the copper cylinder, the annular end face welding that the edge of constantan sheet and copper are heat sink, a copper conductor is drawn at the center of constantan sheet, draws another root copper conductor on the copper cylinder, and described detector is connected between two copper conductors.

3. Multifunction Sensor as claimed in claim 2 is characterized in that, described hot-fluid probe and heat sink material are the material that nickel chromium triangle-nisiloy or platinum rhodium 13-platinum or platinum rhodium 10-platinum or platinum rhodium 30-platinum rhodium 6 can be formed thermopair.

4. Multifunction Sensor as claimed in claim 1, it is characterized in that described heat sink being assemblied on the matrix that is provided with in the described shell, matrix and shell welding, described cooling device is the tank that is provided with between matrix and the shell, and described another thermopair is arranged on the matrix or on heat sink.

5. Multifunction Sensor as claimed in claim 4 is characterized in that, ccontaining cooling water pipe in the described tank, and cooling water pipe one end is welded on the described matrix, and the adapter that the other end is provided with links to each other with water supply installation.

6. Multifunction Sensor as claimed in claim 1 is characterized in that, described hot-fluid probe top is provided with thermal insulation ceramics, smears heat-conducting silicone grease on the surface of contact of thermal insulation ceramics and hot-fluid probe.

7. measure hot-fluid and method of temperature under a sensor hot environment as claimed in claim 1: may further comprise the steps: 1) adopt said apparatus to measure the voltage signal of the thermopair of hot-fluid probe and heat sink composition, pass through formula $\frac{E}{q}=4.37\&times;{10}^{-4}\&CenterDot;\frac{R^2}{S},$ Can get hot-fluid, wherein E is that voltage, q are that hot-fluid, R are that radius, the S that hot-fluid is popped one's head in is the thickness of hot-fluid probe; 2) measure the low-temperature space temperature at the heat sink place of heat conducting element by heat conduction formula T _h-T _l=Δ T, $\mathrm{\&Delta;T}={\mathrm{\&Delta;T}}_1+{\mathrm{\&Delta;T}}_2=q\&CenterDot;\frac{l_1}{k_1{A}_1}+q\&CenterDot;\frac{1}{2\mathrm{\&pi;}{d}_2{k}_2}$ Obtain the temperature of hot-fluid probe high-temperature region, wherein T _hBe the temperature of hot-fluid probe, T _lBe matrix or heat sink temperature, Δ T ₁Be the temperature difference at thermal insulation ceramics two ends, Δ T ₂Be the temperature difference of hot-fluid center probe and edge, q is the hot-fluid at hot-fluid probe place, R ₁Be the thermal resistance of thermal insulation ceramics, R ₂Be the thermal resistance of hot-fluid probe, l ₁Be the thickness of thermal insulation ceramics, k ₁Be the coefficient of heat conductivity of hot-fluid probe, A ₁Be hot-fluid probe area of section, d ₂Be the thickness of hot-fluid probe, k ₂Coefficient of heat conductivity for the hot-fluid probe.

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