CN206504806U - Sapphire fiber black-body cavity temperature sensor - Google Patents

Sapphire fiber black-body cavity temperature sensor Download PDF

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Publication number
CN206504806U
CN206504806U CN201621035033.0U CN201621035033U CN206504806U CN 206504806 U CN206504806 U CN 206504806U CN 201621035033 U CN201621035033 U CN 201621035033U CN 206504806 U CN206504806 U CN 206504806U
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sapphire fiber
body cavity
temperature sensor
signal
black
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CN201621035033.0U
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王鸣
郭余庆
王军
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JIANGSU NENGJIAN ELECTROMECHANICAL INDUSTRIAL Co Ltd
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JIANGSU NENGJIAN ELECTROMECHANICAL INDUSTRIAL Co Ltd
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Abstract

The utility model discloses a kind of sapphire fiber black-body cavity temperature sensor, including sapphire fiber blackbody chamber sensing head, energy-transmission optic fibre, photodetector, pre-amplifying module, AD sampling modules, signal processing module, display module.Sapphire fiber blackbody chamber has the radiation characteristic close to ideal black-body, the heat radiation energy in temperature field can be delivered on photodetector by energy-transmission optic fibre and be converted into electric signal, electric signal is gathered by AD sampling modules, signal processing module analysis calculates the data signal of sampling, is fitted finally by data and draws the functional relation between corresponding temperature and electric signal with demarcation to realize the measurement of temperature.Sapphire fiber black-body cavity temperature sensor system architecture of the present utility model is simple, easy to use.

Description

Sapphire fiber black-body cavity temperature sensor
Technical field
The utility model belongs to optical fiber sensing field, is related to a kind of sapphire fiber available for continuous measuring high-temperature Black matrix cavity sensor.
Background technology
Radiation Temperature Measurement Instrument calculates corresponding temperature by the energy of non-cpntact measurement heat radiation, therefore in industry and science The fields such as research, which are achieved, to be widely applied.It has temperature measurement accuracy high, the advantages of reproducible, obtains general in high temperature measurement And application.The MS/MI series of IR temperature measurers that such as Germany's match is risen, the system accuracy in the range of 1500 DEG C to 2500 DEG C reaches To 0.5% measured value, repeatable accuracy is 0.1% thermometric value+1K, and temperature resolution is 0.1 DEG C.Though contactless infrared measurement of temperature Can so there is the higher thermometric upper limit, but the emissivity situation of thermal source is must be known by during its measurement, easily be disturbed, surveyed by background radiation What is obtained is only the temperature of heat source surface.Thermocouple sensor measures the temperature of testee by contacting testee.Contact High Temperature Measurement Technique is mainly measured using noble-metal thermocouples such as platinum, rhodiums, with higher sensitivity and measurement accuracy.But It is that pyrometer couple is typically made by precious metal material, thermocouple has that resistance to corrosion is poor, the longevity again in hot environment Life is short, the drawback such as serious is lost.And in severe corrosive, the environment of strong electromagnetic, it is difficult to normal work.
Utility model content
The purpose of this utility model is to provide sapphire fiber black-body cavity temperature sensor system, and the sensor is a kind of energy Enough detect the measuring instrument of superhigh temperature.Fibre-optic black-body cavity sensor utilizes sapphire fiber high temperature resistant and infrared light transmission characteristic, with Thermal source is contacted, can be with the change of direct measurement thermal field.It will be transmitted using quartzy multimode fibre with the radiation flux of blackbody chamber to remote At thermal source, then coordinate photoelectric cell and circuit system to handle to show, it is to avoid high-temperature work environment and electromagnetic interference, be suitable for Temperature monitoring steadily in the long term.
The technical scheme that the utility model is used by solution its technical problem is:
A kind of sapphire fiber black-body cavity temperature sensor, including sensing head and for handling sensing head feedback signal Circuit system, described sensing head is sapphire fiber blackbody chamber sensing head, including blackbody chamber, protection sleeve pipe, sapphire fiber, Silica fibre, sapphire fiber and blackbody chamber are placed in protection sleeve pipe, and one end of silica fibre is stretched into after protection sleeve pipe, are led to The one end for crossing fibre-optical splice and sapphire fiber is connected, and the other end of sapphire fiber sets blackbody chamber, silica fibre it is another End is then connected with circuit system.
The blackbody chamber is formed by the molybdenum film coated in sapphire fiber end.
One layer of oxide protective film is also coated outside the molybdenum film.
Described fibre-optical splice for respectively with sapphire fiber, silica fibre match matches sleeve pipe.
The protection sleeve pipe is alundum tube.
The circuit system is analog circuit, including integrated photodetector, preamplifier, AD on circuit boards adopt Egf block, signal processing module, display module, wherein:Described photodetector, for receiving the black of silica fibre transmission Body cavity heat radiation energy, can be converted into current signal by the blackbody chamber heat radiation energy;The preamplifier, for that will put The current signal of big photodetector output is converted into voltage signal, and is amplified;The AD sampling modules, for will be preposition The voltage signal of amplifier output is converted to data signal;The signal processing module, for handling the output of AD sampling modules Voltage digital signal, calculates corresponding temperature value by fitting algorithm and is exported by display module.
The signal processing module is the relation reality based on temperature with sampling yardage:
T=ax6+b·x5+c·x4+d·x3+e·x2+f·x+g
Wherein T be temperature, unit for DEG C, x for sampling yardage, a, b, c, d, e, f, g be constant.
The utility model has the advantages that:
(1) using sapphire fiber one end make blackbody chamber and dock silica fibre method make sapphire fiber it is black Body cavity sensing head, can directly plug, repeatability and interchangeability it is very good;Blackbody chamber and sapphire fiber are outer added with corundum protection Sleeve pipe;
(2) energy-transmission optic fibre used is fibre core for 600 μm of special silica fibre, and energy transfer losses are extremely low.Outside optical fiber There is layer of metal armour in flesh side face, is protected the inside fibre core, has to resist and suppresses stretch-proof function.Can come transmission energy using optical fiber With the difficulty of the installation and protection that reduce temperature measurer, and make temperature measurer that there is flexible and miniaturization;
(3) the InGaAs photodiodes that photodetector of the present utility model is encapsulated using standard FC/PC can light with passing Fibre connection is very convenient, and the use of optical fiber can not be influenceed by electromagnetic interference, and makes photodetector away from high temp objects, protects The stability worked online for a long time is demonstrate,proved;
(4) whole system is simple in construction, easily operated, easy to carry.Measurement range is 800-2200 DEG C, and measurement accuracy is ± 0.2%, resolution ratio is 1 DEG C, and response speed is less than 1ms.
Brief description of the drawings
Fig. 1 is the schematic diagram of analog circuit in the utility model sensing system;
Fig. 2 is the structure chart of the utility model sapphire fiber black-body cavity temperature sensor system;
Fig. 3 is the software processing flow figure to signal in the utility model measuring method.
In figure:Photodetector 1;Preamplifier 2;AD sampling modules 3;Signal processing module 4;Display module 5;Black matrix Chamber 61;Match sleeve pipe 62;Protection sleeve pipe 63;Sapphire fiber 64;Silica fibre 65.
Embodiment
Below in conjunction with the accompanying drawings and implementation, the utility model is described in further details.
With reference to Fig. 1 and Fig. 2, the utility model device includes sapphire fiber blackbody chamber sensing head, circuit system, wherein: Main sapphire fiber, matching sleeve pipe and the silica fibre by being coated with blackbody chamber of sapphire fiber blackbody chamber sensing head is constituted; Circuit system is analog circuit, by photodetector 1, preamplifier 2, AD sampling modules 3, signal processing module 4, display mould Block 5 is constituted, and all modules are integrated on one piece of circuit board, and the connection of sensing head and analog circuit is realized by energy-transmission optic fibre 's.Optical signal is converted into electric signal by the utility model in real time through photodetector, introduces analog circuit and radiation temperature measurement is bent The method processing electric signal of line fitting, finally realizes thermometric.
Illustrate to realize using sensing head with reference to Fig. 1 and Fig. 2 and receive emittance, the implementation of measurement temperature.First Sensing head is inserted in thermal field, then the heat radiation energy in thermal field will promote the external emittance of blackbody chamber;Energy passes through again Energy-transmission optic fibre is transferred on photodetector, and then emittance is converted into corresponding current signal by photodetector 1;Electric current Signal carries out I/V conversions and amplification by pre-amplifying module 2, and obtained voltage signal is carried out high-precision by AD sampling modules 3 The sampling of degree ground;Analog signal is converted into after data signal, and correspondence is calculated by the algorithm of curve matching through signal processing module 4 Temperature value and pass through display module 5 export
Illustrate handling process of the signal processing module to signal in sensor with reference to Fig. 3.After sensor is started working, Signal processing module 4 initializes AD sampling modules 3 and display module 5 first, and AD sampling modules 3, which are in, afterwards continues sampling work State, the output current temperature value of display module 5.When sensing head enters thermal field, changed if detecting voltage signal, AD samplings Module 3 will obtain new sampling data signal and be transmitted to signal processing module 4 being calculated, and be exported by display module 5 New temperature value.
Temp measuring system can be using accurate thermometric at the scene, and measured target could correctly be shown by just having to pass through demarcation Temperature.The polynomial curve fitting method based on least square method that the utility model is used, measurement multi-point temp passes through fitting again Obtain the curve of a temperature trend.The method of the utility model demarcation is to substitute measured target, collection using standard blackbody stove Voltage signal under different temperatures.The relation of temperature and voltage sample yardage is directly carried out 6 order polynomial curve matchings, then Obtain the formula of a temperature and sampling yardage:T=ax6+b·x5+c·x4+d·x3+e·x2+ fx+g, wherein T are temperature Spend (DEG C), x is sampling yardage, a, b, c, d, e, f, g are constant.The algorithm write signal processing module 4 of this formula, so Sensor just can be with normal work.

Claims (6)

1. a kind of sapphire fiber black-body cavity temperature sensor, including sensing head and the electricity for handling sensing head feedback signal Road system, is characterised by:Described sensing head is sapphire fiber blackbody chamber sensing head, including blackbody chamber, protection sleeve pipe, Lan Bao Stone optical fiber, silica fibre, sapphire fiber and blackbody chamber are placed in protection sleeve pipe, and protective case is stretched into one end of silica fibre Guan Hou, is connected by one end of fibre-optical splice and sapphire fiber, and the other end of sapphire fiber sets blackbody chamber, silica fibre The other end be then connected with circuit system.
2. sapphire fiber black-body cavity temperature sensor according to claim 1, it is characterised in that the blackbody chamber passes through The molybdenum film that is coated in sapphire fiber end and formed.
3. sapphire fiber black-body cavity temperature sensor according to claim 2, it is characterised in that the molybdenum film One layer of oxide protective film is also coated outside.
4. sapphire fiber black-body cavity temperature sensor according to claim 1, it is characterised in that described fibre-optical splice For respectively with sapphire fiber, silica fibre match matches sleeve pipe.
5. sapphire fiber black-body cavity temperature sensor according to claim 1, it is characterised in that the protection sleeve pipe is Alundum tube.
6. sapphire fiber black-body cavity temperature sensor according to claim 1, it is characterised in that the circuit system is Analog circuit, including it is integrated photodetector on circuit boards, preamplifier, AD sampling modules, signal processing module, aobvious Show module, wherein:
Described photodetector, can be by the blackbody chamber for receiving the blackbody chamber heat radiation energy that silica fibre transmission comes Heat radiation energy is converted into current signal;
The preamplifier, for the current signal for amplifying photodetector output to be converted into voltage signal, and is put Greatly;
The AD sampling modules, the voltage signal for preamplifier to be exported is converted to data signal;
The signal processing module, the voltage digital signal for handling the output of AD sampling modules, is calculated by fitting algorithm Corresponding temperature value is simultaneously exported by display module.
CN201621035033.0U 2016-08-31 2016-08-31 Sapphire fiber black-body cavity temperature sensor Active CN206504806U (en)

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Application Number Priority Date Filing Date Title
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106225951A (en) * 2016-08-31 2016-12-14 江苏能建机电实业集团有限公司 Sapphire fiber blackbody chamber pyrostat and temp measuring method thereof
CN109489855A (en) * 2018-11-20 2019-03-19 中国航天空气动力技术研究院 A kind of sapphire temperature sensor and preparation method thereof and temperature measurement system
CN109827664A (en) * 2017-11-23 2019-05-31 北京振兴计量测试研究所 Temperature sensing device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106225951A (en) * 2016-08-31 2016-12-14 江苏能建机电实业集团有限公司 Sapphire fiber blackbody chamber pyrostat and temp measuring method thereof
CN109827664A (en) * 2017-11-23 2019-05-31 北京振兴计量测试研究所 Temperature sensing device
CN109489855A (en) * 2018-11-20 2019-03-19 中国航天空气动力技术研究院 A kind of sapphire temperature sensor and preparation method thereof and temperature measurement system

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