CN201903399U - Illumination radiation thermometer - Google Patents

Abstract

The utility model discloses an illumination radiation thermometer comprising a light path unit, a detector unit, a constant temperature unit and a data acquisition unit, wherein the light path unit comprises a front limiting diaphragm, a light barrier and a back limit diaphragm; the detector unit comprises a light filter and a detector, and the light filter is a narrow band pass interference light filter with the center wavelength of 900nm and the half-band width of 42nm; constant temperature circulating water is supplied by constant temperature water bathes, and a reverse double circulation water pipeline is utilized for ensuring that the temperature of a hollow cavity and the detector unit is constant, and the front limiting diaphragm, the back limit diaphragm, the light filter and the detector are in the stable and uniform environment. In the utility model, as the light path unit is designed into a non-imaging light path unit and consisting of only two limiting diaphragms, the pollution problem of optical elements is avoided, the system stability is improved, the source of radiant point size effects is reduced, and the lower limit of measuring temperature with the thermometer reaches 600 DEG C.

Description

A kind of illumination radiation thermometer

Technical field

The utility model belongs to field of photoelectric technology, relates to a kind of radiation thermometer, particularly relates to a kind of radiation thermometer of 900nm illumination.

Background technology

China National Measuring Science Research Inst. has developed the standard light electric pyrometer that transmits as temperature scale on the basis of setting up China's warm area international temperature scale (ITS-90) more than 961.78 ℃.The standard light electric pyrometer belongs to the brightness radiation thermometer, is to be made of imaging optical system, detector and signal processing apparatus.In the optical system of brightness radiation thermometer, face of every increase on light path all can inevitably increase the possibility of light reflection, diffraction and scattering.And radiation source size effect (SSE) derives from the diffraction and the scattering of radiation, and the influences such as imperfect and optical distortion of radiation temperature meter optical system.Therefore the SSE of imaging optical path system is generally bigger.The light path system of brightness radiation thermometer generally is made up of optical elements such as two convex lens and field stops, these component exposure are in air, be easy to be infected with dust in air, cause the optical component changes of properties, thereby cause the instability and the SSE that measure to increase.

Germany physical technique research institute (PTB) has developed a kind of illumination radiation thermometer, and its wavelength is 802nm, and the illumination radiation thermometer temperature-measuring range of half-band width 26nm is 950 ℃ to 2300 ℃, and lower limit temperature is higher, can not satisfy the thermometric needs of lower temperature.

The utility model content

(1) technical matters that will solve

The technical problems to be solved in the utility model provides a kind of radiation thermometer, when guaranteeing the stable performance of radiation thermometer optical component, improves the stability of thermometer measure, reduces the radiation source size effect, and reduces the lower limit temperature of temperature-measuring range.

(2) technical scheme

In order to solve the problems of the technologies described above, the utility model provides a kind of illumination radiation thermometer, and it comprises: optical path unit, detector cells, constant temperature unit and data acquisition unit;

Described optical path unit comprises:

Before snoot, be arranged on described constant temperature unit front portion, parasitic light light barrier and back parasitic light light barrier before being respectively arranged with before and after the snoot before described;

Back snoot is arranged on described constant temperature unit rear portion;

Described constant temperature unit comprises:

Shading diaphragm sleeve is arranged between described back parasitic light light barrier and the described back snoot;

The thermometer inner chamber is enclosed within described shading diaphragm sleeve outside;

The constant temperature water bath chamber is enclosed within described thermometer inner chamber outside;

Described detector cells comprises:

Detector is arranged on snoot rear portion, described back;

Optical filter is arranged between described detector and the back snoot;

Described data acquisition unit comprises platinum-resistance thermometer, is installed in the set mounting hole in described constant temperature unit rear portion, contacts with described constant temperature unit rear portion.

In the above-mentioned illumination radiation thermometer, described constant temperature unit also comprises constant temperature water pipe, is arranged on the described constant temperature water bath chamber.

In the above-mentioned illumination radiation thermometer, described illumination radiation thermometer also comprises gas-filled tube, and the one end connects described shading diaphragm sleeve, and the other end connects outside charger by the gas-filled tube joint.

In the above-mentioned illumination radiation thermometer, be provided with several coaxial diaphragms in the described shading diaphragm sleeve at interval.

In the above-mentioned illumination radiation thermometer, described detector is a silicon photodiode detector.

In the above-mentioned illumination radiation thermometer, described preceding snoot, the coaxial diaphragm in back snoot and the shading diaphragm sleeve is the diaphragm through oxide treatments.

In the above-mentioned illumination radiation thermometer, the diameter of described preceding snoot and back snoot is 3mm, and distance is 300mm between the two.

In the above-mentioned illumination radiation thermometer, the light hole diameter of described preceding parasitic light light barrier and back parasitic light light barrier is 6mm.

In the above-mentioned illumination radiation thermometer, described optical filter is the narrow bandpass interference filter of centre wavelength 900nm, half-band width 42nm.

In the above-mentioned illumination radiation thermometer, described preceding snoot, preceding parasitic light light barrier, back parasitic light light barrier, shading diaphragm sleeve, the coaxial setting of back snoot and optical filter.

(3) beneficial effect

The described illumination radiation thermometer of technique scheme has only two snoots to form because optical path unit is designed to non-imaging optical path unit, has avoided the pollution problem of optical element, thereby has improved system stability, and reduced the source of SSE; Adopt narrow bandpass interference filter and the silicon photodiode detector of centre wavelength 900nm, half-band width 42nm, the lower limit temperature of thermometer thermometric is reduced greatly, can measure 600 ℃ temperature.

Description of drawings

Fig. 1 is the structural principle synoptic diagram of the illumination radiation thermometer of the utility model embodiment;

Fig. 2 is the structural representation of the illumination radiation thermometer of the utility model embodiment;

Fig. 3 is a Cu point consolidation curve synoptic diagram among the utility model embodiment;

Fig. 4 is the relative spectral response degree under the 900nm radiation thermometer linear coordinate of the utility model embodiment;

Fig. 5 is the relative spectral response degree under the 900nm radiation thermometer index coordinate of the utility model embodiment;

Fig. 6 is the mean effective mavelength synoptic diagram of the Cu point of the utility model embodiment to measurement point.

Wherein, 1a: preceding snoot; 1b: back snoot; 2: constant temperature water pipe; 3: the constant temperature water bath chamber; 4: the thermometer inner chamber; 5: optical filter; 6: detector; 7: gas-filled tube; 8: platinum-resistance thermometer; 9: shading diaphragm sleeve; 10a: preceding parasitic light light barrier; 10b: back parasitic light light barrier; 21: blackbody radiation source; 22: accurate diaphragm; 23: optical filter; 24: photodetector.

Embodiment

Below in conjunction with drawings and Examples, embodiment of the present utility model is described in further detail.Following examples are used to illustrate the utility model, but are not used for limiting scope of the present utility model.

At first introduce the measuring principle of illumination radiation thermometer.Planck law provides the relation between the spectral radiance of object and temperature, the wavelength.Brightness method radiation thermometer utilizes Planck law, by known projection area and the known solid angle radiation flux that send of imaging optical path systematic survey radiation source on assigned direction, calculates spectral radiance, and then definite temperature.The illumination radiation thermometer then is subjected under the condition of light solid angle in qualification, measures the spectral radiance illumination that detector receives, and utilizes Planck law to determine the testee temperature.The illumination radiation thermometer usually on the basis of illuminometer radiation source one side additional diaphragm is set limits and accept solid angle, by the irradiance of non-imaging optical path systematic survey radiation source to detector face.The illumination radiation temperature of present embodiment design is counted the single band radiation thermometer, measures irradiance by the light solid angle that is subjected to that limits test surface, determines the apparent temperature of radiation source again according to the single-valued function relation of irradiance and temperature.Its light channel structure figure sees Fig. 1, after two accurate diaphragms 22 of the light that blackbody radiation source 21 sends through being provided with at interval, enter photodetector 24 by optical filter 23 and detect processing, wherein accurate diaphragm 22, optical filter 23 and the photodetector 24 near optical filter 23 is an integral body, is referred to as the optical filter radiometer.

The principle of radiation temperature measurement is based on the heat radiation of object and the corresponding relation of temperature, and its quantitative description is a blackbody radiation law.The most basic blackbody radiation law is the Planck blackbody radiation law, Planck law provided black matrix spectral radiance illumination E and wavelength, be subjected to the definite relation between light solid angle, the temperature.

$E(\mathrm{\&lambda;},T,\mathrm{\&Omega;})=\mathrm{\&Omega;}{\mathrm{<figure-callout\; id="1"\; label="c"\; filenames="HDA0000029712740000031.png,HDA0000029712740000032.png"\; state="\{\{state\}\}">c</figure-callout>}}_1{\mathrm{\&lambda;}}^{-5}\frac{1}{\mathrm{\&pi;exp}({\mathrm{<figure-callout\; id="2"\; label="c"\; filenames="HDA0000029712740000012.png,HDA0000029712740000032.png"\; state="\{\{state\}\}">c</figure-callout>}}_2/\mathrm{\&lambda;T})-1}---\left(1\right)$

Wherein, E is the spectral radiance illumination of test surface, c ₁, c ₂Be first, second radiation constant, λ is the wavelength in the vacuum, and Ω is for being subjected to the light solid angle, and T is the temperature of black matrix.

Formula (1) is the general expression formula of Planck law, and it describes out the radianting capacity of black matrix and the relation between wavelength and the temperature exactly.The illumination radiation thermometer adopts interference filter as monochromator, and the output photocurrent of its photodetector-silicon photoelectric diode is

$I_P={\&Integral;}_0^{\&infin;}\mathrm{\&Phi;}(\mathrm{\&lambda;},T)R\left(\mathrm{\&lambda;}\right)\mathrm{d\&lambda;}={\&Integral;}_0^{\&infin;}\mathrm{AE}(\mathrm{\&lambda;},T)R\left(\mathrm{\&lambda;}\right)\mathrm{d\&lambda;}---\left(2\right)$

In the formula: (A is the back stop area to Ф for λ, the T) spectral radiant flux that receives for photodetector, and T is the temperature of tested black matrix, and (λ T) is the radiant illumination of optical filter radiometer to E, and R (λ) is the spectral responsivity of optical filter and detector.Following formula is the single valued relation of detector output current IP and tested blackbody temperature T.If known illumination radiation thermometer is put T in reference temperature _rThe time its photodetector be output as I _PrThen

$\frac{I_P}{I_{\mathrm{Pr}}}=\frac{{\&Integral;}_0^{\&infin;}E(\mathrm{\&lambda;},T)R\left(\mathrm{\&lambda;}\right)\mathrm{d\&lambda;}}{{\&Integral;}_0^{\&infin;}E(\mathrm{\&lambda;},T_r)R\left(\mathrm{\&lambda;}\right)\mathrm{d\&lambda;}}=\frac{E({\mathrm{\&lambda;}}_e,T)}{E({\mathrm{\&lambda;}}_e,T_r)}---\left(3\right)$

In the formula: λ _eFor at temperature interval T _rMean effective mavelength between the～T.With planck formula substitution formula (3), then have:

$T=\frac{{\mathrm{<figure-callout\; id="2"\; label="c"\; filenames="HDA0000029712740000012.png,HDA0000029712740000032.png"\; state="\{\{state\}\}">c</figure-callout>}}_2}{{\mathrm{\&lambda;}}_e\&CenterDot;\ln \left\{\frac{I_{\mathrm{Pr}}}{I_P}\right[\exp \left(\frac{{\mathrm{<figure-callout\; id="2"\; label="c"\; filenames="HDA0000029712740000012.png,HDA0000029712740000032.png"\; state="\{\{state\}\}">c</figure-callout>}}_2}{{\mathrm{\&lambda;}}_e{T}_r}\right)-1]+1\}}---\left(4\right)$

As effective wavelength λ _eIn the time of can ignoring with variation of temperature, the output I of temperature T and photodetector _PBe single valued relation and be the monobasic explicit function.Formula (4) is the fundamental formular of illumination radiation thermometer accounting temperature.

The structural representation of the illumination radiation thermometer of the utility model embodiment comprises optical path unit as shown in Figure 2, detector cells, constant temperature unit and data acquisition unit four parts; Wherein, constant temperature unit comprises: shading diaphragm sleeve 9 is set in the thermometer inner chamber 4 of shading diaphragm sleeve 9 outsides and is set in the constant temperature water bath chamber 3 of thermometer inner chamber 4 outsides, also offer constant temperature water pipe 2 on the constant temperature water bath chamber 3, be connected with outside constant-temperature water supply device; Optical path unit comprises: be set in sequence in the back parasitic light light barrier 10b of shading diaphragm sleeve 9 front portions successively, preceding snoot 1a, preceding parasitic light light barrier 10a, and the back snoot 1b that is arranged on the constant temperature unit rear portion; Detector cells comprises: be arranged on the detector 6 at parasitic light light barrier 10b rear portion, back and be arranged on detector 6 and back parasitic light light barrier 10b between optical filter 5; Data acquisition unit comprises platinum-resistance thermometer 8, is installed in the set mounting hole in constant temperature unit rear portion, contacts with the constant temperature unit rear portion, is used for detecting the internal temperature of constant temperature unit and is sent to data processing equipment.The effect of preceding snoot 1a and back snoot 1b is the restriction light path, perhaps limits the receipts light solid angle of detector 6; Snoot 1a directly was subjected to radiate source radiation before preceding parasitic light light barrier 10a was used to prevent, snoot 1a temperature raises before avoiding, and back parasitic light light barrier 10b is used to prevent that parasitic light from directly entering detector 6.

In the present embodiment, be provided with the thermostatical circulating water unit between preceding snoot 1a and the back parasitic light light barrier 10b, its circulating water pipe adopts two-way circulation, avoid the thermograde of the long body that causes of constant temperature water bath chamber 3 cavitys, its course of work is: the thermostatical circulating water unit mainly contains four interfaces, two inlets and two outlets, two inlets are placed on the bottom of thermostatical circulating water unit, entering the thermostatical circulating water unit by the side entrance, lower-left exports out from the upper right side, export out from the upper left side and enter the thermostatical circulating water unit, thereby guarantee two inlet water temperature unanimities by the lower right side inlet.

In the present embodiment, be provided with several coaxial diaphragms in the shading diaphragm sleeve 9 at interval.

In the present embodiment, preceding snoot 1a, preceding parasitic light light barrier 10a, back parasitic light light barrier 10b, shading diaphragm sleeve 9, back snoot 1b and optical filter 5 coaxial settings.

The thermometer global design is long 380mm, the aluminum device of maximum outside diameter 90mm.The inside and outside wall of thermometer and all diaphragms are all done oxide treatments, and absorptance is about 0.96.

The constant temperature unit of thermometer is designed to two-way recirculated water constant temperature system, and the cavity inside temperature maintenance that guarantees thermometer is at 22 ℃ ± 0.03 ℃, and detector 6 is a Hamamatsu S1336-8BK silicon photoelectric diode.The details such as the table 1 of each element of thermometer.

Table 1

Title	The thermometer explanation
		Temperature-measuring range	600-1500℃
Forward and backward snoot diameter	3mm
		Optical filter centre wavelength nominal value	900nm
Optical filter half-band width nominal value	40nm
		Optical filter cut-off region transmittance	?＜10 -4
Optical filter manufacturer	U.S. BARR
		Photodetector	?Hamamatsu?S1336-8BK

Dark current signals	?＜10 -14A
		The thermometer temperature control	?22℃±0.03℃

The diameter of preceding snoot 1a and back snoot 1b is 3mm, and spacing is 300mm, and the light hole diameter of preceding parasitic light light barrier 10a and back parasitic light light barrier 10b is 6mm.Optical filter 5 is the narrow bandpass interference filter of centre wavelength 900nm, the half-band width 42nm of the production of U.S. BARR company.Constant temperature unit provides thermostatical circulating water with water bath with thermostatic control, adopts oppositely two circulating water lines to guarantee the cavity and the detector cells constant temperature of thermometer, and snoot 1a, back snoot 1b, optical filter 5 and detector 6 are in the stabilized uniform temperature environment before making.Detector signal is gathered by the measurement Displaying Meter of the RT9032 pyrometer of China National Measuring Science Research Inst.'s development in the thermometer, and instrument is finished the A/D conversion to the control of micro current amplifier and pair amplifier output voltage under the control of microprocessor; Press the corresponding range gain calculating of amplifier photocurrent.Can receive control commands corresponding or send measurement data, instrument state, parameter etc. by gpib interface.

In order to keep illumination radiation thermometer inside cavity drying, improve thermometric stability, connect shading diaphragm sleeve 9 and be provided with gas-filled tube 7, it is connected with outside charger, charges into nitrogen from back to front in cavity, and nitrogen flow is 0.5L/min.

The illumination radiation thermometer of present embodiment has limited the receipts light solid angle of radiate source radiation to detector 6 by preceding snoot 1a and back snoot 1b two diaphragms, the physical dimension by two snoots and apart from the illumination that can calculate the radiation source that detector 6 receives.Light beam obtains the homogeneous beam of arrowband by interference filter 5.Detector 6 is measured by the beam energy behind two snoots and the interference filter 6.And the centre wavelength of interference filter 6 and bandwidth can measure accurately.According to the spectral radiance illumination that Planck law provides, the relation of wavelength and temperature, thus calculate the brightness temperature of radiation source.

Homogeneous radiation thermometer grading method according to this temperature-measurement principle has multiple mode, and present embodiment has adopted ITS-90 single-point calibration mode to reappear the ITS-90 method, and promptly single point of fixity is given with reference to value, by measuring the method thermometric of monochromatic irradiation degree ratio.In this method, need:

(1) select the ITS-90 defining fixed point given with reference to value.

(2) measure the spectral response characteristic of illumination radiation thermometer and calculate effective wavelength.

(3) determine the non-linear effects of explorer response.

The calibration of radiation thermometer uses Cu point of fixity blackbody radiation source as the reference point.Temperature value that Cu is ordered and measurement current value are respectively the T in (3) formula _rAnd I _Pr, the consolidation curved measurement result that Fig. 3 is ordered for Cu.For checking is the thermometric accuracy of reference point calibration with the Cu point, measured Al point of fixity blackbody radiation source.The point of fixity black matrix that experiment adopts CHINO company to produce, the crucible hatch bore diameter of black matrix all is

Emissivity is 0.999, and the point of fixity accuracy is in ± 0.3 ℃.

The Cu point consolidation Wen Ping that measures is surveying three consolidation Wen Ping on the same day, gets each and solidifies the Ping Tai mean value of 40 points comparatively stably, and three mean values that solidify Ping Tai are as the current value I with reference to point _Pr

In addition, utilize the Cu point to examine the stability of this thermometer.Promptly surveying three consolidation Wen Ping on the same day, a week measured three days, not aiming measurement again on the same day.The deviation of solidifying Ping Tai of Ce Lianging is 0.02 ℃ on the same day, and it is 0.15 ℃ that the platform maximum deviation is solidified in all nine times of measuring.Cause again aiming back temperature value measured have reason than large deviation have following some: the influence that one) aiming repeatability is brought; Two) influence that brings of point of fixity furnace temperature drift; Three) influence of thermometer itself drift.

By formula (4) as can be known, one of prerequisite of using monochromatic form thermometric formula according to Planck law is accurately to determine the mean effective mavelength of illumination radiation thermometer.It is the function of radiation thermometer spectral response and dut temperature, calculate the effective wavelength of radiation thermometer, must accurately measure the spectral responsivity R (λ) of thermometer earlier, calculates effective wavelength by numerical integrating again ^[4]The monochromator that the spectral responsivity measurement mechanism adopts is the double grating monochromator of JOBINYVON company, and repeatability can reach 0.005nm.Fig. 4,5 is the measured value of the relative spectral response degree under the different coordinates, and Fig. 4 shows that the half-band width of thermometer spectral response is 42nm, and Fig. 5 shows to be 10 of crest value less than 815nm and greater than the spectral response value in the cut-off region scope of 970nm ^-4Below.

Can calculate the limiting effective wavelength λ of illumination radiation thermometer according to the relative spectral response degree measurement result of illumination radiation thermometer _tWith mean effective mavelength λ _e(T _r, T).Spectral responsivity was measured in four months five times, and the standard deviation of the limiting effective wavelength of ordering at Cu is 0.171nm.Fig. 6 is the mean effective mavelength λ of Cu point to measurement point _e(T _Cu, T) measured value.The mean effective mavelength λ that the Cu point is ordered to Al among the figure _e(T _Cu, standard deviation TAl) is 0.172nm, the temperature uncertainty that effective wavelength causes is 55mK; Standard deviation to the mean effective mavelength of 800 and 900 two points was respectively 0.170nm and 0.168nm in Cu o'clock, and the temperature uncertainty that effective wavelength causes is respectively 42mK and 29mK.

Present experiment condition can not be to non-linear measurement of general objective infrared radiation thermometer system, present embodiment is with reference to the nonlinear measurement result of the Japanese metering 900nm of institute radiation temperature meter systems, the optical filter wave band of two experimental provisions is similar, the detector model is identical, the non-linear illumination radiation thermometer to this experiment of the system of its measurement non-linear similar.Less than 0.01%, and be limited to 1500 ℃ on the thermometric of illumination radiation thermometer at system's non-linear value that Cu is ordered, therefore put aside system's effect of nonlinear in the present embodiment.The illumination radiation thermometer has been verified the thermometric performance of Al point, 800 ℃ and 900 ℃ three temperature spots with the single-point indexing.The Al point was surveyed three consolidation Wen Ping in one day, got the current value that solidifies platform.800 ℃ and 900 ℃ two temperature spot blackbody radiation source temperature controls, the temperature of blackbody radiation source is a standard with standard light electric pyrometer RT9032, its temperature value T _RT9032Trace to the source to national benchmark.The illumination radiation thermometer is measured 800 ℃, 900 ℃ blackbody radiation source, after the blackbody radiation source temperature control is stable, removes the illumination radiation thermometer, gives the blackbody radiation source assignment with the brightness radiation thermometer that traces national benchmark.Table 2 is the temperature-measuring results of illumination radiation thermometer at these three temperature spots.

Table 2

The current value that current value is measured for the illumination radiation thermometer in the table 2, the temperature value that T calculates for the single-point calibration is at Cu point and Al point two row T ₉₀Be the point of fixity temperature of ITS90 definition, at 800 ℃ and 900 ℃ of two row T ₉₀Be the thermometric value of standard light electropsychrometer, Δ T is that the T value deducts T ₉₀Temperature value.Deviation (T-T in Al point illumination radiation thermometer thermometric value and the nominal temperature of Al point ₉₀) be-0.04 ℃, on 800 ℃ of temperature spots, illumination radiation thermometer thermometric value and standard light electropsychrometer thermometric value deviation (T-T ₉₀) be 0.09 ℃; On 900 ℃ of temperature spots, illumination radiation thermometer thermometric value and standard light electropsychrometer thermometric value deviation (T-T ₉₀) be 0.11 ℃.

As can be seen from the above embodiments, the utility model embodiment has only two snoots to form because optical path unit is designed to non-imaging optical path unit, has avoided the pollution problem of optical element, thereby has improved system stability, and reduced the source of SSE; Adopt narrow bandpass interference filter and the silicon photodiode detector of centre wavelength 900nm, half-band width 42nm, the lower limit temperature of thermometer thermometric is reduced greatly, can measure 600 ℃ temperature.

The above only is a preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite that does not break away from the utility model know-why; can also make some improvement and replacement, these improvement and replacement also should be considered as protection domain of the present utility model.

Claims (10)

1. an illumination radiation thermometer is characterized in that, comprising: optical path unit, detector cells, constant temperature unit and data acquisition unit;

Described optical path unit comprises:

Preceding snoot (1a) is arranged on described constant temperature unit front portion, parasitic light light barrier (10a) and back parasitic light light barrier (10b) before being respectively arranged with before and after the described preceding snoot (1a);

Back snoot (1b) is arranged on described constant temperature unit rear portion;

Described constant temperature unit comprises:

Shading diaphragm sleeve (9) is arranged between described back parasitic light light barrier (10b) and the described back snoot (1b);

Thermometer inner chamber (4) is enclosed within described shading diaphragm sleeve (9) outside;

Constant temperature water bath chamber (3) is enclosed within described thermometer inner chamber (4) outside;

Described detector cells comprises:

Detector (6) is arranged on snoot (1b) rear portion, described back;

Optical filter (5) is arranged between described detector (6) and the back snoot (1b);

Described data acquisition unit comprises platinum-resistance thermometer (8), is installed in the set mounting hole in described constant temperature unit rear portion, contacts with described constant temperature unit rear portion.

2. a kind of illumination radiation thermometer as claimed in claim 1 is characterized in that described constant temperature unit also comprises constant temperature water pipe (2), is arranged on the described constant temperature water bath chamber (3).

3. a kind of illumination radiation thermometer as claimed in claim 1 is characterized in that described illumination radiation thermometer also comprises gas-filled tube (7), and the one end connects described shading diaphragm sleeve (9), and the other end connects outside charger by the gas-filled tube joint.

4. a kind of illumination radiation thermometer as claimed in claim 1 is characterized in that, is provided with several coaxial diaphragms in the described shading diaphragm sleeve (9) at interval.

5. a kind of illumination radiation thermometer as claimed in claim 1 is characterized in that described detector (6) is a silicon photodiode detector.

6. a kind of illumination radiation thermometer as claimed in claim 4 is characterized in that, described preceding snoot (1a), and the coaxial diaphragm in back snoot (1b) and the shading diaphragm sleeve (9) is the diaphragm through oxide treatments.

7. a kind of illumination radiation thermometer as claimed in claim 1 is characterized in that, the diameter of described preceding snoot (1a) and back snoot (1b) is 3mm, and distance is 300mm between the two.

8. a kind of illumination radiation thermometer as claimed in claim 1 is characterized in that, the light hole diameter of described preceding parasitic light light barrier (10a) and back parasitic light light barrier (10b) is 6mm.

9. a kind of illumination radiation thermometer as claimed in claim 1 is characterized in that, described optical filter (5) is the narrow bandpass interference filter of centre wavelength 900nm, half-band width 42nm.

10. a kind of illumination radiation thermometer as claimed in claim 1 is characterized in that, described preceding snoot (1a), preceding parasitic light light barrier (10a), back parasitic light light barrier (10b), shading diaphragm sleeve (9), back snoot (1b) and the coaxial setting of optical filter (5).

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