CN1030152C - Hot-pipe type radiation thermograph - Google Patents
Hot-pipe type radiation thermograph Download PDFInfo
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- CN1030152C CN1030152C CN 92108639 CN92108639A CN1030152C CN 1030152 C CN1030152 C CN 1030152C CN 92108639 CN92108639 CN 92108639 CN 92108639 A CN92108639 A CN 92108639A CN 1030152 C CN1030152 C CN 1030152C
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- heat pipe
- temperature
- radiation
- detector
- thermometer
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Abstract
The present invention relates to a heat pipe type radiation thermometer for measuring a radiation temperature. The present invention is characterized in that all components of the thermometer, which are susceptible to the influence of an environmental temperature and contain a radiation detector, a light filter and a preamplifier, are all arranged in a heat pipe with excellent thermal uniformity; the self temperature of the heat pipe is detected by a temperature detector arranged in the heat pipe and is controlled by a temperature controlling circuit. The present invention has the advantages of high stability and high precision; for instrument adjustment, only the temperature of the heat pipe needs to be controlled by a simple circuit, and the correction of the environmental temperature is needless to the instrument. The thermometer made by adopting the technical scheme of the present invention has favorable effects after tryout.
Description
The present invention relates to a kind of hot-pipe type radiation thermograph as radiometric temperature measurement.
Existing radiation thermometer does not have heat-pipe apparatus.Radiation detector, optical filter especially interference filter and prime amplifier are the radiation thermometer key components and partss, but they are very easily influenced by ambient temperature, cause the unstable properties of radiation thermometer, and the precision of thermometer is reduced.By the development of Tokyo optical-mechanical Co., Ltd., the test authentication can be used as the homogeneous radiation thermometer that the transmission standard is used through Japanese national Weights and Measures Bureau, requires to work in constant temperature enclosure, and has listed temperature coefficient.Obviously, this instrument application scenario is restricted, and can only use in the very little occasion of variation of ambient temperature, and instrument need carry out the environment temperature correction by temperature coefficient, so the raising of the precision of instrument is also restricted.In order to overcome the influence that detector is subjected to environment temperature, the WFH-602 type infrared thermometer that the accurate industrial single band temperature that Britain Land infrared thermometer company produces is taken into account the production of Shanghai Industry Automation Meter Research Institute has adopted compensation schemes, promptly in prime amplifier, settled thermistor, with the offset detector variation that is caused prime amplifier output influenced by ambient temperature with variation of ambient temperature.There is weak point in above-mentioned two kinds of schemes: (a) all can not carry out ambient temperature compensation to interference filter, (b) carrying out with thermistor in the scheme of ambient temperature compensation, because radiation detector and prime amplifier are non-linear with the variation of environment temperature, and discreteness is very big, thus with thermistor can not these devices of full remuneration temperature effect.The standard form radiation pyrometer of Italy Weights and Measures Bureau development places thermostat with detector, makes detector be operated in temperature constant state, and not influenced by ambient temperature.Though this compensation scheme can improve the precision of development instrument, but still it is influenced by ambient temperature to eliminate optical filter.
The object of the invention provides a kind of hot-pipe type radiation thermograph of high stability not influenced by ambient temperature.
Technical scheme of the present invention is the components and parts that all are easily influenced by ambient temperature, comprise radiation detector, optical filter and prime amplifier place the fabulous heat pipe of thermal uniformity, and the temperature of heat pipe itself is detected by the platinum resistance thermometer sensor, that is placed in one, and are controlled by the temperature control circuit.Like this, the device and the external environment heat pipe of easy temperature influence have been isolated in the thermometer, thereby have eliminated the ambient temperature effect of these devices.
The embodiment of the invention is done detailed explanation in conjunction with the accompanying drawings.
Fig. 1 is the hot-pipe type radiation thermograph principle assumption diagram;
Fig. 2 is heat pipe temperature operation circuit figure.
By shown in Figure 1, interference filter 29, detector 23 and prime amplifier wiring board 21 all are placed in the heat pipe 32.Pass protection window 1 from the radiation of measured target, assembled by objective lens 3,7 imaging of via hole diameter light hurdle are to through hole reflective mirror 8.This instrument is focused.2 is focusing rings among the figure; The 4th, objective holder; The 5th, instrument housing; The 6th, reflective mirror, it will be reflexed to by the light from around the measured target of through hole reflective mirror 8 reflection in the sighting system of instrument and go; The 9th, image changing mirror; The 10th, the lens barrel of sighting system; The 11st, field lens; The 12nd, the dim light mirror, when the measured target temperature was very high, it can lower because of the too high stimulation to eyes of brightness; The 13rd, eyepiece; The 14th, eyepiece focusing ring, the adjusting eyepiece is used, so that instrument adapts to different observers; The 15th, screening glass prevents that external dust from entering instrument; 16 is the exit pupil position, human eye can observe in the exit pupil position measured target surroundings just as.Lens 31 and 27 are equipped with in optical filter 29 front and back, and from the radiation of target itself, the through hole on the via through holes reflective mirror and enter heat pipe becomes directional light, to adapt to the requirement of interference filter behind condenser 31.The parallel beam that passes interference filter is converged on the detector by condenser 27, the electric signal that detector produces after prime amplifier amplifies as the output of instrument, among the figure 17 is adjuster bars, when dut temperature is very high, with it light path is dialled in the dim light hole and incided energy on the detector, can expand the temperature-measuring range of instrument like this with minimizing.The 18th, electrical outlets; the 19th, the back door of instrument; the 20th, the over cap of heat pipe, 22 is the bearing of heat pipe, 24 and 25 are the parasitic light light hurdle that disappears; 26 is lock-screw; 28 is the dim light mirror, is used for decay ambient light when dut temperature is too high, and 33 is the protecting sheathing of heat pipe; the detector 30 of measuring heat pipe temperature is housed, its available platinum resistance thermometer sensor, or thermistor or other temperature-sensing element (device) in heat pipe.This detector is connected with a temperature control circuit, the temperature control circuit as shown in Figure 2, Rt is a platinum resistance thermometer sensor,, it and other resistance R
1, R
2, R
3Form bridge circuit, bridge circuit is exported through operational amplifier A and transistor D
1And D
2The circuit of forming is connected with heat pipe heater strip Rw.When heat pipe temperature departed from setting value, the deviation output quantity of bridge circuit changed, and amplified again through transistor D through operational amplifier A
1And D
2After the circuit of forming carried out current conversion, the electric current of the heat pipe heater strip Rw that flows through changed, thereby heat pipe temperature is maintained on the fixed temperature, and general, the temperature of heat pipe is controlled within 40 ℃ ± 0.1 ℃.
Owing to adopt technical scheme of the present invention, the stability of thermometer greatly improves, 4 name into the hot-pipe type radiation thermograph model machine of the narrow wave band radiation thermometer of WFJ-01 type high precision on gold and aluminium furnace for reproduction of fixed points through China National Measuring Science Research Inst.'s test shows, variation in 10～12 days interval between twice measured value is 0.32 ℃ to the maximum, and minimum is 0.The temperature uncertainty (0.3 ℃) that this changing value provides near golden and aluminium furnace for reproduction of fixed points very much.This explanation, the stability of this thermometer are very satisfied.Because stability improves, the precision of instrument has also obviously improved, and the precision of this instrument has reached 0.25～0.5% dai τ, and τ is Kelvin's value of dut temperature, this thermometer is on probation, respond well through Zhongnan Polytechnic Univ of China Non-Ferrous Metal Corporation test analysis center.Advantage of the present invention is a good stability, the precision height, and instrument debugging aspect only needs the temperature of simple circuit control heat pipe to get final product, and does not need again instrument to be carried out the environment temperature correction.
Claims (4)
1, a kind of hot-pipe type radiation thermograph is characterized in that, all components and parts easily influenced by ambient temperature of thermometer are comprised that radiation detector, optical filter and prime amplifier place among the good heat pipe of thermal uniformity.
2, hot-pipe type radiation thermograph according to claim 1 is characterized in that, a heat pipe temperature detector is set in heat pipe, and detector is connected with a heat pipe temperature control circuit.
3, pattern of fever pipe radiation thermometer according to claim 1 is characterized in that, the heat pipe temperature detector is platinum resistance or thermistor, platinum resistance thermometer sensor, Rt and resistance R
1, R
2, R
3Form bridge circuit, bridge circuit is exported through operational amplifier A and transistor D
1And D
2The circuit of forming is connected with heat pipe heater strip Rw.
4, hot-pipe type radiation thermograph according to claim 1, it is characterized in that, lens 31 and 27 are equipped with in described optical filter 29 front and back, radiation from target itself, through hole on the via through holes reflective mirror and enter heat pipe, become directional light behind condenser 31, the parallel beam that passes interference filter is converged on the detector by condenser 27.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92108639 CN1030152C (en) | 1992-11-23 | 1992-11-23 | Hot-pipe type radiation thermograph |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92108639 CN1030152C (en) | 1992-11-23 | 1992-11-23 | Hot-pipe type radiation thermograph |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1087423A CN1087423A (en) | 1994-06-01 |
| CN1030152C true CN1030152C (en) | 1995-10-25 |
Family
ID=4943730
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92108639 Expired - Fee Related CN1030152C (en) | 1992-11-23 | 1992-11-23 | Hot-pipe type radiation thermograph |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1030152C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100494925C (en) * | 2007-02-15 | 2009-06-03 | 武汉钢铁(集团)公司 | Contacting/non-contacting molten metal high temperature measuring apparatus and measuring method |
-
1992
- 1992-11-23 CN CN 92108639 patent/CN1030152C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1087423A (en) | 1994-06-01 |
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