CN1174986A - Method for tracing measurement of high temp. in melted material and device thereof - Google Patents

Abstract

The present invention relates to a fusant interior high-temp. tracking measuring method and its apparatus. Said method uses the comparision of irradiation luminance of light source to be measured and the irradiation luminance of standard light source as basis and includes such steps of lighting, light-modulating, light-spliting, photo-electric transformation, signal amplification, interpretation, calculation and temp. value output; and its apparatus consists of temp. -sensing probe, optical cable, multiwavelength pyrometer and data storage analyser for matched special-purpose software. Its temp. -sensing probe mainly is formed from metal oxide monocrystal, protective shell and high-low temp. photoconductive coupler. Said invention can measure high-temp. of 1000-2000 deg. C, temp. -measured error is less than 0.5%, and its service life is long and application is extensive.

Description

Molten matter internal high temperature tracking measurement method and device

The present invention relates to the temperature measuring equipment that high temperature melts matter temperature inside measuring method and is exclusively used in this method.

Before the present invention made, the measureing method of high-temperature commonly used was used platinum one rhodium thermocouple method more in metallurgy industry both at home and abroad.Develop tungsten one rhenium thermocouple method (see " (tungsten one rhenium thermopair) " Beijing Iron and Steel Research Geueral Inst volume, publishing house of Ministry of Metallurgical Industry publishes, 1993) in recent years again.They all belong to the thermopair method.The life-span of thermopair only is tens seconds, and not only the life-span weak point uses these class methods not carry out tracking measurement to molten matter internal temperature, and often draws glitch, and precision is low, finally causes product rejection.In order to improve the measurement confidence level of thermopair, the Chinese capital iron company instrument and meter factory was studied successfully the automatic data collection method and the device of temp measuring system in 1991, can improve measuring accuracy with the sampling rate of per second 4 times.But owing to do not change the thermopair sensing mode, therefore fail fundamentally to change the batch (-type) measurement means, can not realize the tracking continuous coverage of molten matter internal temperature.Chinese Academy of Sciences's Xi'an ray machine was succeeded in developing the dual-wavelength optical-fiber temperature sensor in 1992, but can only the Measuring Object surface temperature, can not be used to measure molten matter internal temperature.In addition, U.S. Harry diamond research institute and American Bureau of Standards (ABS) have developed " jet kapillary pyrometer " and (have seen " (temperature survey in science and the industry and control) " Chinese translation (volume two); Science Press, 1985), the character that is characterized in utilizing the viscosity of gas working dielectric to change with temperature is determined temperature by the correlativity of viscosity and temperature.The above-mentioned measureing method of high-temperature and device all are only limited in industrial vacuum stove and high temperature air stove and use, the metallurgy industry field of can not be applied to high temperature, strong oxidation, vigorous erosion, washing away by force.

The purpose of this invention is to provide a kind of new type high temperature measuring method and device, be intended to melt the Continuous Tracking measurement of matter internal high temperature, this device can high temperature resistant, anti-oxidant, anti-erosion, can be used for the internal temperature diagnostic measures of industrial high temperature smelting furnace, combustion chambers of internal combustion engines, jet engine firing chamber.

The objective of the invention is to realize by following proposal.

Molten matter internal high temperature is thereby that spoke brightness with the spoke brightness of determinand optical radiation and standard sources compares and measures molten matter internal temperature to be measured with combining measuring method, and its concrete steps are:

1) gathers molten matter interior lights radiation, it is transferred to the multi-wavelength pyrometer by optical cable;

2) optical radiation with the molten matter inside of the high temperature that collects is modulated to the light that is interrupted light and is broken down into different wave length;

3) with the photoelectricity conversion method with the 2nd) step gained light signal converts electric signal to;

4) with the 3rd) step gained electric signal amplification;

5) utilize computer and data acquisition control process software and temperature computation special software that electric signal is scaled Temperature numerical and draw the molten time dependent curve of matter internal temperature.

The ultimate principle of the molten matter internal high temperature tracking measurement method of the present invention is as follows:

Pyrometer of the present invention is based on Planck heat radiation theory, the spoke brightness of light source to be measured and the spoke brightness of standard sources is compared, thereby record molten matter light-source temperature to be measured.

For emissivity is the grey body light source of ε, and its spoke brightness is provided by planck formula:

J (λ, T)=ε J (λ, T) (1) wherein J (λ T) is ε=1, and temperature is the radiance of the absolute black body of T, $J(\mathrm{\&lambda;},T)={\mathrm{<figure-callout\; id="1"\; label="C"\; filenames="A9611767400122.png"\; state="\{\{state\}\}">C</figure-callout>}}_1{\mathrm{\&lambda;}}^{-5}[{\mathrm{<figure-callout\; id="2"\; label="e\; C"\; filenames="A9611767400121.png,A9611767400122.png"\; state="\{\{state\}\}">e</figure-callout>}}^{\frac{C_{}}{}}-1{]}^{-1}------\left(2\right)$

For actual measurement, measuring amount is λ _iAnd j _i(λ _i), consider experiment measuring error ν _i, then (1) formula should be:

ν _i＝εJ(λ _i，T)-j _i(λ _i) (3) ${\mathrm{\&nu;}}^2=\underset{i=l}{\overset{n}{\mathrm{\&Sigma;}}}{\mathrm{\&nu;}}_{\mathrm{<figure-callout\; id="2"\; label="i"\; filenames="A9611767400121.png,A9611767400122.png"\; state="\{\{state\}\}">i</figure-callout>}}^2=\underset{i=l}{\overset{n}{\mathrm{\&Sigma;}}}[\mathrm{\&epsiv;J}({\mathrm{\&lambda;}}_i,T)-j_i\left({\mathrm{\&lambda;}}_i\right){]}^2-----\left(4\right)$ According to principle of least square method, obtain from (4) formula exactly and satisfy ν _iε when getting minimum value and the value of T, that is:

$\frac{{\mathrm{d\&nu;}}^2}{\mathrm{dT}}=0--------\left(6\right)$ $\frac{{\&PartialD;\mathrm{\&nu;}}^2}{\&PartialD;T}+\frac{{\&PartialD;\mathrm{\&nu;}}^2}{\&PartialD;\mathrm{\&epsiv;}}-\frac{\mathrm{d\&epsiv;}}{\mathrm{dT}}=0------\left(7\right)$ Wherein $\mathrm{\&epsiv;}=\frac{1}{n}\underset{i=l}{\overset{n}{\mathrm{\&Sigma;}}}\frac{j_i\left({\mathrm{\&lambda;}}_i\right)}{J\left({\mathrm{\&lambda;}}_{i}T\right)}------\left(8\right)$ $\frac{{\&PartialD;\mathrm{\&nu;}}^2}{\&PartialD;T}=2{\mathrm{<figure-callout\; id="2"\; label="C"\; filenames="A9611767400121.png,A9611767400122.png"\; state="\{\{state\}\}">C</figure-callout>}}_2\underset{i=l}{\overset{n}{\mathrm{\&Sigma;}}}[(\mathrm{\&epsiv;}\&CenterDot;J-j_i\left({\mathrm{\&lambda;}}_i\right))\&CenterDot;\frac{\mathrm{\&epsiv;}\&CenterDot;e^{\frac{C_2}{{\mathrm{\&lambda;}}_{i}T}}}{e^{\frac{C_2}{{\mathrm{\&lambda;}}_{i}T}}-1}\&CenterDot;\frac{J}{{\mathrm{\&lambda;}}_i{T}^2}]-----\left(9\right)$ $\frac{\&PartialD;{\mathrm{\&nu;}}^2}{\&PartialD;\mathrm{\&epsiv;}}=2\underset{i=l}{\overset{n}{\mathrm{\&Sigma;}}}J[\mathrm{\&epsiv;J}-j_i\left({\mathrm{\&lambda;}}_i\right)]------\left(10\right)$ $\frac{\mathrm{d\&epsiv;}}{\mathrm{dT}}=-\frac{1}{n}\frac{C_2}{{\mathrm{<figure-callout\; id="1"\; label="C"\; filenames="A9611767400122.png"\; state="\{\{state\}\}">C</figure-callout>}}_1}\underset{i=l}{\overset{n}{\mathrm{\&Sigma;}}}[{\mathrm{\&lambda;}}_i^4{\mathrm{<figure-callout\; id="2"\; label="e\; C"\; filenames="A9611767400121.png,A9611767400122.png"\; state="\{\{state\}\}">e</figure-callout>}}^{\frac{C_{}}{}}\&CenterDot;j_i\left({\mathrm{\&lambda;}}_i\right)/T^2]-----\left(11\right)$ With (7), (9), (10), (11) simultaneous solution, just can draw ε, T.Above-mentioned system of equations is found the solution cumbersome, and equation (7) also has a particular solution in fact, that is: Like this, equal zero just to find the solution by (9) and (10) and draw:

Practice shows that the result who draws with (13) is consistent with the result who uses (7), (9), (10), (11) simultaneous solution.

Molten matter internal high temperature tracking measurement device is made of temperature-sensing probe, multi-wavelength pyrometer and data storage analyser.The temperature-sensing probe center is the monocrystalline metal oxide of a cylindrical shape, is set with the special cermacis containment vessel of a tubular in this monocrystalline cylinder circumference, and there is the hydrocooler of a high low temperature photoconduction coupling mechanism and interlayer sleeve shaped the cylindrical rear end of this monocrystalline.Its special cermacis containment vessel cylinder lumen is a cylindrical shape, and this containment vessel profile can be for cylindrical or prismatic.The inner chamber and the profile of the high low temperature photoconduction coupling mechanism at its rear portion are identical with the inner chamber and the profile of special cermacis containment vessel, and the cavity shape of hydrocooler interlayer sleeve is identical and identical with the profile of special cermacis containment vessel and high low temperature photoconduction coupling mechanism.Temperature-sensing probe is connected with the multi-wavelength pyrometer by optical cable.The multi-wavelength pyrometer is by the optical cable socket, discoidal optical modulation and wavelength selector, and photoelectric commutator and follower amplifier constitute.From the front to the back, run through respectively on its optical modulation and the wavelength selector disc and be embedded with two to seven circular narrow band pass filters.The multi-wavelength pyrometer is connected with the data storage analyser by cable.

The embodiments of the invention accompanying drawings provides.

Description of drawings:

Fig. 1, molten matter internal high temperature tracking measurement equipments overall structure figure;

Fig. 2, temperature-sensing probe central lateral plane structural drawing;

Fig. 3, multi-wavelength pyrometer overall construction drawing;

Fig. 4, optical modulation and wavelength selector structural drawing;

Fig. 5, the follower amplifier circuit diagram;

Fig. 6, data storage analyser functional-block diagram;

Fig. 7, the embedded scheme of installation of temperature-sensing probe;

Fig. 8, the present invention are used for 10% chromium steel measuring temp of molten steel figure as a result;

Fig. 9, multi-wavelength pyrometer calibration principle figure.

Sequence number implication among the figure: 1. optical cable, 2. multi-wavelength pyrometer, 3. cable; 4. data storage analyser, 5. temperature-sensing probe, molten matter 6. to be measured; 7. smelting furnace, 8. ceramic containment vessel, 9. water inlet; 10. chilled water, 11. hydrocoolers, 12. high low temperature photoconduction coupling mechanisms; 13. water delivering orifice; 14. the monocrystalline metal oxide pole, 15. optical cable plugs, 16. narrow band pass filters; 17. optical modulation and wavelength selector; 18. CD-ROM drive motor, 19. photoelectric commutators, 20. high-voltage power supplies; 21. follower amplifier; 22. low-tension supply, 23. signal output cables, 24. weight stacks; 25.CPU (NPU); 26. keyboard, 27. high resolution displaies, 28. programmable amplifiers; 29.A/D converter; 30. the high speed dual port buffer, 31. storage management controllers, 32. display controllers; 33. Floppy Disk Controller; 34. floppy disk, 35. plain flanges, 36. smelting furnace shells; 37. furnace wall; 38.Y axle indication liquid steel temperature (K), 39. 10% chromium steel molten steel temperature rise curves, 40.X axle instruction time (min); 41. blackbody furnace; 42. catoptron, 43. standard light electric pyrometers, 44. optical lenses.

Embodiment 1, temperature-sensing probe (Fig. 2) and daylighting:

The center of temperature-sensing probe 5 is the monocrystalline metal oxide of cylindrical shape, diameter 0.50-5mm, and length 300-1000mm can adopt Al ₂O ₃Monocrystalline or MgO monocrystalline are made.Surrounded by ceramic containment vessel 8 around this monocrystalline metal oxide pole 14; its front end knocking outside; its rear end is surrounded and sealing by high low temperature photoconduction coupling mechanism 12; center, its rear end is connected with optical cable 1; this optical cable stretches out in the middle of high low temperature photoconduction coupling mechanism 12; insert multi-wavelength pyrometer 2, ceramic containment vessel 8 is by TiB ₂Add an amount of high-temperature oxide (as Al ₂O ₃, MgO etc.) compression moulding forms through high temperature sintering again, also hot pressing moulding has anti-oxidant, anti-thermal shock, erosion-resistant characteristics, can protect the monocrystalline metal oxide 14 at temperature-sensing probe 5 centers not cracked.Simultaneously, it has good thermal conductivity again, can guarantee monocrystalline metal oxide daylighting and biography light effectively under the washing away, denude of the molten matter that flows.Outside surface coincide around the inner chamber of the ceramic containment vessel 8 of this kind and the columniform monocrystalline metal oxide 14.Its profile is the garden cylindricality, can be four-prism or positive six prisms etc., and the butt coupling of high and low temperature optical fiber is connect by metal nuts such as Al, Cu, Fe, makes the spacing that leaves 1-5mm between the high and low temperature fiber end face.Hydrocooler 11 two ends form with ring plate sealings such as metal A l, Cu, Fe and are enclosed in high low temperature fiber coupler 12 cavity on every side.On the front and rear portions sidewall of cavity, be provided with water inlet 9 and water delivering orifice 13, the long 5-20cm of this cavity.Hydrocooler 11 can spread out of temperature-sensing probe 5 by means of flowing cold water from molten matter heat in time absorbs to be taken away, can long-term work to guarantee low temperature optical fiber.The optical cable of temperature-sensing probe 5 rear ends is made by silica fibre, core diameter 50-100 μ m, numerical aperture N _A=0.16-0.20, length is generally 30-200m, and the radiation energy of the molten matter inside that it can collect temperature-sensing probe 5 reaches multi-wavelength pyrometer 2.

Embodiment 2, and multi-wavelength pyrometer (Fig. 3, Fig. 4) and optical modulation, optical wavelength selection, opto-electronic conversion and electric signal amplify:

Multi-wavelength pyrometer 2 is made of optical cable 1, optical cable socket 15, optical modulation and wavelength selector 17, photoelectric commutator 19, follower amplifier 21 and signal output cable 23 successively.Optical cable 1 is identical with the optical cable 1 of temperature-sensing probe 5.Optical modulation and wavelength selector 17 (Fig. 4) are a rosette that diameter is Φ 80-150mm, and this disk is driven by a high-speed motor, can be around its center of circle rotation.This rosette penetrability on a circle on surface is embedded with narrow band pass filter 16 and 1 weight stack 24 of 2-7 piece different wave length, the centre wavelength of optical filter 16 can select 2-7 different wave length as operation wavelength between 0.7-1.1 μ m, is preferably in evenly to distribute between the 0.7-1.1 μ m or distribute near even.The halfwidth of optical filter is 10-20nm, and transmitance is not less than 50%.The beam modulation that optical filter 16 can transmit optical cable 1 on the one hand with the protection electrooptical device, can resolve into the white light that optical cable 1 transmits the light of different wave length, so that determine temperature with multi-wavelength light for being interrupted light on the other hand.Photoelectric commutator 19 is selected S for use ₁The photomultiplier that the type photocathode material is made, its voltage divider is made by the reference parameter that manufacturer provides, and cathode sensitivity is greater than 9mA/lm, and gain is greater than 10 ⁵, the rise time is less than 5ns.Photoelectric commutator 19 is by high-voltage power supply 20 power supplies, and its effect is that the light signal that will transmit, pass the optical filter 16 on optical modulation and the wavelength selector 17 by optical cable 1 and inject converts electric signal to.Follower amplifier 21 can amplify this electric signal, and the circuit diagram that Fig. 5 provides is when the pull-up resistor of photo-electric conversion element is high-impedance resistors, reflection takes place and the follower amplifier reference line figure of employing for fear of signal.Follower amplifier 21 is by low-tension supply 22 power supplies.High-voltage power supply 20 technical requirements are, output voltage range 500-2000V is adjustable continuously, and degree of stability drift in 8 hours is less than 0.1%, output current 2A/ road, output way 2 tunnel.The index of low-tension supply 22: voltage 10-50V.D.C.

Embodiment 3, the read-write of data storage analyser (Fig. 6) and molten matter temperature:

The chief component of data storage analyser 4 is: computing machine is a technical grade 486, internal memory 4M, hard disk 540M, monitor 9 " or 14 ", data acquisition board sampling rate 20MSPS, binary channels, resolution 8bit, precision 1%.In addition, data storage analyser 4 also comprises data acquisition control process software and temperature computation special software.Data storage analyser 4 and parts thereof can be buied from the market, through selecting, can be fit to the present invention and use, and electric signal is scaled Temperature numerical and draws the molten time dependent curve of matter internal temperature.

Embodiment 4, the demarcation of multi-wavelength pyrometer (Fig. 9):

Before using thermometric of the present invention, need demarcate, to determine its system constants many ripples pyrometer 2.The principle and the method for demarcating are as follows:

Timing signal is measured blackbody furnace 41 temperature with the quasi-optical electric pyrometer 43 of catoptron 42 direction indicators earlier, again catoptron 42 is turned to optical lens 44, makes the light-emitting area of blackbody furnace 41 be imaged on temperature-sensing probe 5 places.The light of standard sources is passed to multi-wavelength pyrometer 2 through high and low temperature optical fiber, carry out transferring to the data storage analyser after the opto-electronic conversion, when the luminous energy that receives when the multi-wavelength pyrometer is in its range of linearity, the signal amplitude (voltage) of data storage analyser record is directly proportional with the luminous energy of collecting fiber, that is: $h_0\left(\mathrm{\&lambda;}\right)=K\left(\mathrm{\&lambda;}\right).{\mathrm{<figure-callout\; id="1"\; label="K"\; filenames="A9611767400122.png"\; state="\{\{state\}\}">K</figure-callout>}}_1.K_2{\mathrm{<figure-callout\; id="3"\; label="K"\; filenames="A9611767400121.png,A9611767400142.png"\; state="\{\{state\}\}">K</figure-callout>}}_3\frac{{\mathrm{<figure-callout\; id="2"\; label="sin"\; filenames="A9611767400121.png,A9611767400122.png"\; state="\{\{state\}\}">sin</figure-callout>}}^2{\mathrm{\&alpha;}}_{\mathrm{<figure-callout\; id="2"\; label="O\; sin"\; filenames="A9611767400121.png,A9611767400122.png"\; state="\{\{state\}\}">O</figure-callout>}}}{{\sin }^{}}\mathrm{\&epsiv;J}(\mathrm{\&lambda;},T_0)-----\left(14\right)$ Wherein: the system constants of K (λ)-multi-wavelength pyrometer (when wavelength X),

K ₁The transmitance of-optical lens,

K ₂-light source window glass transmitance,

K ₃The reflectivity of-catoptron,

α _cBe the numerical aperture angle of optical fiber,

a _oRelative aperture angle for lens.As given T _oAfter, as long as determine corresponding signal amplitude h _o(λ), just can obtain system constants K (λ).The demarcation of single temperature spot often makes K (λ) value accurate inadequately, widen temperature-measuring range, and measurement result is produced than mistake, and best bet is to adopt multi-point calibration in whole temperature-measuring range.Can carry out match to calibration point with following formula during multi-point calibration, determine K (λ) value. $K\left({\mathrm{\&lambda;}}_i\right)=\frac{\mathrm{\&Sigma;}{h}_{0\mathrm{iJ}}{({\mathrm{<figure-callout\; id="2"\; label="e\; C"\; filenames="A9611767400121.png,A9611767400122.png"\; state="\{\{state\}\}">e</figure-callout>}}^{\frac{C_{}}{}}-1)}^{-1}}{{\mathrm{\&epsiv;}}_0{C}_i{\mathrm{\&lambda;}}_i^{-5}{k}_{0i}\frac{{\sin }^2{\mathrm{\&alpha;}}_0}{{\mathrm{<figure-callout\; id="2"\; label="sin"\; filenames="A9611767400121.png,A9611767400122.png"\; state="\{\{state\}\}">sin</figure-callout>}}^2{\mathrm{\&alpha;}}_c}\mathrm{\&Sigma;}{({\mathrm{<figure-callout\; id="2"\; label="e\; C"\; filenames="A9611767400121.png,A9611767400122.png"\; state="\{\{state\}\}">e</figure-callout>}}^{\frac{C_{}}{}}-1)}^{-2}}-----\left(15\right)$ Embodiment 5, colour temperature measurement:

Except with formula (7) (9) (10) (11) simultaneous solution or directly calculate the temperature with (13) formula, the ratio of spoke brightness is determined the colour temperature of light source to be measured under also available two wavelength.Colour temperature is the color call temperature also, is a science and an industrial most widely used assumed temperature near the emitter true temperature.It is defined as: when black matrix and non-black-body two wavelength X ₁And λ ₂Under monochromatic radiation brightness when equal, the temperature that then claims black matrix is the colour temperature of non-black-body.

Definition according to colour temperature utilizes Wien's radiation law, can derive the computing formula of colour temperature: $T_C=\mathrm{kl}{n}^{-1}\left[\mathrm{\&alpha;}\left(\frac{h_1}{h_2}\right)\right]------\left(16\right)$ Wherein: $k=C_2[\frac{1}{{\mathrm{\&lambda;}}_2}-\frac{1}{{\mathrm{\&lambda;}}_1}]$

λ ₁And λ ₂Be two observation wavelength (m); h ₁, h ₂It is the amplitude (V) of output signal after the opto-electronic conversion; α is the test macro constant, and is definite by demarcating.

Embodiment 6, and the laboratory of apparatus of the present invention is demarcated:

According to the colour temperature measurement principle that embodiment 5 introduces, utilize any two wavelength of multi-wavelength pyrometer can realize colour temperature measurement.But need to determine its system constants α by demarcating.

Utilize tungsten lamp to determine system constants α, the method that the chamber of experimentizing is demarcated is as follows:

Computing formula (16) by colour temperature can draw: $e^{\frac{K}{T_c}}=\mathrm{\&alpha;}\left(\frac{h_1}{h_2}\right)------\left(17\right)$ In experiment measuring, owing to there is measuring error, only add in (17) formula that residual error could set up: $e^{\frac{K}{T_c}}=\mathrm{\&alpha;}\left(\frac{h_1}{h_2}\right)+\mathrm{\&nu;}------\left(18\right)$

In order to reduce measuring error, generally adopt multi-point calibration.At timing signal, change the standard sources temperature T _Coi(i=1 ..., n), determine the multi-wavelength thermometer to each T _CoiResponse amplitude h _1oi, h _2oi(i=1 ..., n) just obtained following equation of condition like this: $e^{\frac{k}{T_{\mathrm{coi}}}}=\mathrm{\&alpha;}\left(\frac{{\mathrm{<figure-callout\; id="1"\; label="h"\; filenames="A9611767400122.png"\; state="\{\{state\}\}">h</figure-callout>}}_{1\mathrm{oi}}}{{\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="A9611767400121.png,A9611767400122.png"\; state="\{\{state\}\}">h</figure-callout>}}_{2\mathrm{oi}}}\right)+{\mathrm{\&nu;}}_i(i=1,\&CenterDot;\&CenterDot;\&CenterDot;,n)-----\left(19\right)$ $\underset{i=l}{\overset{n}{\mathrm{\&Sigma;}}}{\mathrm{\&nu;}}_i^2=\underset{i=l}{\overset{n}{\mathrm{\&Sigma;}}}[e^{\frac{k}{T_{\mathrm{coi}}}}-\mathrm{\&alpha;}\left(\frac{{\mathrm{<figure-callout\; id="1"\; label="h"\; filenames="A9611767400122.png"\; state="\{\{state\}\}">h</figure-callout>}}_{1\mathrm{oi}}}{{\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="A9611767400121.png,A9611767400122.png"\; state="\{\{state\}\}">h</figure-callout>}}_{2\mathrm{oi}}}\right)]-----\left(20\right)$ According to the least square method principle, choose a α value exactly, make Obtain minimum value, promptly $\frac{d}{\mathrm{d\&alpha;}}\underset{i=l}{\overset{n}{\mathrm{\&Sigma;}}}{\mathrm{\&nu;}}_i^2=0------\left(21\right)$ Thereby just can draw: $\mathrm{\&alpha;}=\underset{i=l}{\overset{n}{\mathrm{\&Sigma;}}}\left(\frac{{\mathrm{<figure-callout\; id="1"\; label="h"\; filenames="A9611767400122.png"\; state="\{\{state\}\}">h</figure-callout>}}_{1\mathrm{oi}}}{{\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="A9611767400121.png,A9611767400122.png"\; state="\{\{state\}\}">h</figure-callout>}}_{2\mathrm{oi}}}{e}^{\frac{k}{T_{\mathrm{coi}}}}\right)/\underset{i=l}{\overset{n}{\mathrm{\&Sigma;}}}{\left(\frac{{\mathrm{<figure-callout\; id="1"\; label="h"\; filenames="A9611767400122.png"\; state="\{\{state\}\}">h</figure-callout>}}_{1\mathrm{oi}}}{{\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="A9611767400121.png,A9611767400122.png"\; state="\{\{state\}\}">h</figure-callout>}}_{2\mathrm{oi}}}\right)}^2-----\left(22\right)$

Embodiment 7, the operation of apparatus of the present invention:

1) the overall assembling of the utility model device (Fig. 1, Fig. 7):

(1) temperature-sensing probe 5 and quartzy optical cable 1 are docking together, note when tightening the coupling nut, preventing that optical cable from rotating with nut, in case optical cable fractures;

(2) water pipe with the intake-outlet 9,14 of hydrocooler 11 connects;

(3) quartzy optical cable 1 other end is plugged on the light input plug 15 of multi-wavelength pyrometer 2;

(4) connect signal output cable 23 on the signal output plug with multi-wavelength pyrometer 2, the other end of signal output cable 23 is connected on the signal input socket of data storage analyser 4;

(5) power lead with multi-wavelength pyrometer 2, data storage analyser 4 is plugged on 220V respectively, on the Power pinboard of 50Hz.

2) test is prepared:

(1) the test beginning is preceding 30 minutes, opens the high-voltage electric switch of multi-wavelength pyrometer 2, shows the voltage indication about 500V on the voltage table, after 5 minutes, rotate the high pressure turn-knob, make the registration on the voltage table reach predetermined value (this value is determined at timing signal, and provided) in operation instructions;

(2) open data storage analyser 4 power switches, check whether every function is normal, need set various parameters by measuring;

(3) measured preceding 5 minutes, open the low-tension supply 22 of the follower amplifier 21 of multi-wavelength pyrometer 2, the pilot lamp on this switch " bright ";

(4) measured preceding 2 minutes, open the power supply of drive motor 18, the modulation optical splitter begins rotation work.

3) measure:

(1) spot measurement: spot measurement be meant temperature-sensing probe 5 be installed on the point of fixity (as temperature-sensing probe is embedded furnace wall Fig. 7 or from furnace roof insert fixed), probe 5 is no longer mobile;

(2) multimetering: multimetering can realize by the insertion position that changes temperature-sensing probe 5, measures the temperature variation of different depth, can finish by the insertion depth that changes probe 5;

If the temperature in synchronization requirement measurement different location then should adopt a plurality of temperature-sensing probes 5 while and usefulness, be positioned over different measuring points respectively and realize;

(3) starting of Ce Lianging and carrying out:

1. after finishing the test preparation, only need provide " RUN " instruction on data storage analyser 4, surveying work will be undertaken by predefined Automatic Program; Measurement result will be pressed regularly displays temperature result of setting-up time step-length on display, and will demonstrate temperature curve over time:

2. when temperature reaches design temperature, data storage analyser 4 will send the tinkle of bells, remind liter (falling) temperature to reach predetermined value, and send necessary main signal (cut off heating power supply or open heating power supply etc.);

4) shutdown:

(1) the high voltage adjusting turn-knob is threaded to minimum, the voltage table registration is reduced to about 500V;

(2) close the switch of high-voltage power supply 21;

(3) close the switch of follower amplifier 22, low-tension supply 23;

(4) close the switch of CD-ROM drive motor 18;

(5) close the power supply of data storage analyser 4;

(6) pull out data storage analyser 4 and multi-wavelength pyrometer worker's power lead.

Fig. 8 is the heating curve figure with apparatus of the present invention practical measurement 10% chromium steel liquid steel temperature.

The present invention has following features:

1. temperature-sensing probe of the present invention has been owing to adopted in recent years special cermacis and the high-temperature resistant optical fiber that goes out newly developed, Thereby can insert in the 1000-2000 ℃ of melting media (such as AL, Cu, Fe and alloy thereof etc.) and be not etched, damage, Can be high temperature resistant, do not melt, anti-oxidant, the anti-pad of burn into does not shake, does not burst, does not fall slag, can be repeatedly Use, but continuous operation more than month, and its life-span is longer than a furnace life.

2. owing to use Fibre Optical Sensor and in conjunction with photoelectron, machine element, thereby realized in the smelting furnace molten Accurate, continuous, the tracking measurement of matter internal high temperature, measure error is less than 0.5%. For smelting industry take temperature as Benchmark, realization automation provide reliable means of testing.

3. of many uses, can be used for industrial high temperature stove, combustion chambers of internal combustion engines, jet engine combustion chamber etc. The internal temperature diagnostic measures.

Claims (4)

1. molten matter internal high temperature tracking measurement method is characterized in that the spoke brightness of determinand optical radiation and the spoke brightness of standard sources are compared, thereby measures molten matter internal temperature to be measured, and concrete steps are:

1) gathers the radiation of solute interior lights, it is transferred to the multi-wavelength pyrometer by optical cable;

2) optical radiation with the molten matter inside of the high temperature that collects is modulated to the light that is interrupted light and resolves into different wave length;

3) with the photoelectricity conversion method with the 2nd) step gained light signal converts electric signal to;

4) with the 3rd) step gained electric signal amplification;

5) utilize computer and data acquisition control process software and temperature computation special software that electric signal is scaled Temperature numerical and draw the molten time dependent curve of matter internal temperature.

2. molten matter internal high temperature tracking measurement device; it is characterized in that by temperature-sensing probe; multi-wavelength pyrometer and data storage analyser constitute; temperature-sensing probe is connected with the multi-wavelength pyrometer by optical cable; the multi-wavelength pyrometer is connected with the data storage analyser by cable again simultaneously; the temperature-sensing probe center is the monocrystalline metal oxide of a cylindrical shape; the ceramic containment vessel that a tubular is arranged in this monocrystalline cylinder circumference; there is the hydrocooler of a high low temperature photoconduction coupling mechanism and interlayer sleeve shaped the cylindrical rear end of this monocrystalline, and the multi-wavelength pyrometer is by the optical cable socket; discoidal optical modulation and wavelength selector; photoelectric commutator and follower amplifier constitute.

3. according to the high temperature measurement device of claim 2; the ceramic containment vessel cylinder lumen that it is characterized in that temperature-sensing probe is a cylindrical shape; this containment vessel profile can be for cylindrical or prismatic; the inner chamber of high low temperature photoconduction coupling mechanism and profile are identical with the inner chamber and the profile of ceramic containment vessel, and hydrocooler interlayer barrel bore shape is identical and identical with the profile of ceramic containment vessel and high low temperature photoconduction coupling mechanism.

4. according to the high temperature measurement device of claim 2, it is characterized in that on the optical modulation of multi-wavelength pyrometer and wavelength selector, from the front to the back, running through being embedded with two to seven circular arrowbands and considering mating plates.

Images