CN211824827U - Ultra-high temperature sensor calibration system - Google Patents
Ultra-high temperature sensor calibration system Download PDFInfo
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- CN211824827U CN211824827U CN202020739566.7U CN202020739566U CN211824827U CN 211824827 U CN211824827 U CN 211824827U CN 202020739566 U CN202020739566 U CN 202020739566U CN 211824827 U CN211824827 U CN 211824827U
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- 238000002791 soaking Methods 0.000 claims abstract description 44
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 43
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 43
- 239000010439 graphite Substances 0.000 claims abstract description 43
- 238000009529 body temperature measurement Methods 0.000 claims abstract description 24
- 230000005540 biological transmission Effects 0.000 claims abstract description 19
- 238000001816 cooling Methods 0.000 claims description 12
- 239000011261 inert gas Substances 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 4
- 230000007613 environmental effect Effects 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims 1
- 230000005855 radiation Effects 0.000 description 16
- 238000013461 design Methods 0.000 description 13
- 238000012360 testing method Methods 0.000 description 12
- 238000002485 combustion reaction Methods 0.000 description 5
- 238000009413 insulation Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 238000011065 in-situ storage Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000035515 penetration Effects 0.000 description 4
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- 238000009826 distribution Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000005457 optimization Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- QFXZANXYUCUTQH-UHFFFAOYSA-N ethynol Chemical group OC#C QFXZANXYUCUTQH-UHFFFAOYSA-N 0.000 description 1
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- 238000004880 explosion Methods 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000004377 microelectronic Methods 0.000 description 1
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Abstract
The ultra-high temperature sensor calibration system is characterized by comprising the following components in percentage by weight: the device comprises a sealed cavity, an environment control unit, a graphite soaking block, a heat source unit, a temperature measurement unit and a main control unit, wherein a laser transmission lens for allowing external laser to penetrate into is arranged on the sealed cavity, the graphite soaking block and the temperature measurement unit are arranged in the sealed cavity, the graphite soaking block is arranged in the irradiation range of the laser transmission lens, the temperature measurement unit is used for detecting the graphite soaking block, the heat source unit is arranged outside the sealed cavity, the heat source unit heats the graphite soaking block in the sealed cavity by transmitting laser through the laser transmission lens, and the environment control unit, the heat source unit and the temperature measurement unit are all electrically connected with the main control unit.
Description
Technical Field
The utility model belongs to the technical field of temperature sensor tests measurement, concretely relates to ultra-high temperature sensor calibration system.
Background
The target of weapon development is that the flying speed is faster, the striking precision is higher, the damage power is larger, and the comprehensive performance is stronger. In pursuit of the achievement of these goals, new problems not previously encountered or problems that could be avoided in the initial studies were inevitably encountered.
The technical problem of temperature parameter testing in an ultrahigh temperature environment is a typical representative. For example, in various engine test runs, parameters such as temperature are parameters which need to be obtained in real time, the closer to the in-situ test, the better, but the temperature of an engine combustion chamber exceeds 1600 ℃, and severe environments such as high oxidizability, particle deposition, airflow scouring and the like exist, so that the long-time in-situ test cannot be realized in the prior art. In addition, various dynamic parameters need to be acquired under the conditions of ultrahigh temperature environment and limited space in the design tasks of re-entering of advanced missile rocket and penetration of the shape and load of warheads. In fact, the military forces have recognized and begun to address this fundamental problem that restricts the development of weaponry.
And testing parameters such as temperature and the like in an ultrahigh-temperature environment to provide various basic data (temperature and the like) of performance optimization design and health state monitoring for various advanced engines. Such as: the change rule of the temperature distribution in the substrate and the heat transfer rule along the wall thickness direction obtained in the solid engine hot test can be used as the basis to more accurately optimize the heat insulation structure of the combustion chamber, reduce the mass of the heat insulation structure and increase the mass ratio. The pressure change rule in the engine is obtained, the design parameters of the inner trajectory of the engine can be verified, and the structure of the pressure-bearing part is optimized. The optimization of the appearance and the load of the high-speed flight body, the penetration warhead design and the like are all based on dynamic parameters such as temperature and the like acquired in the flight process. The tests all require long time (>30min) exposure to ultra high temperature environment higher than 1000 ℃ and are completed in situ in a limited space.
The ultra-high temperature test is a precondition for optimizing the design of the heat insulation structure of the combustion chamber of the solid engine. The solid rocket engine designs the thermal protection structure of the combustion chamber according to the analysis and calculation results of the heat insulation layer exposure time, the flow field and the temperature field and the test parameters of the heat conductivity, the specific heat capacity and the oxyacetylene ablation rate of the heat insulation layer material. At present, the design and the working reliability of the heat insulating layer can be evaluated only by the empirical judgment of the static ablation state of the heat insulating layer after the heat trial run is cooled, so that the thickness of the ablation layer can only adopt a redundant design to ensure the reliability of a system, the mass ratio is reduced, and the efficiency of an engine is seriously influenced.
In nuclear reactor experiments, engine operation, advanced missile and rocket reentry, ammunition explosion and penetration warhead shape design, the problem of long-time ultrahigh temperature test is inevitably encountered. For example, in various engine test runs, long-time in-situ acquisition of temperature parameters is required, basic data of performance optimization design and health state monitoring are provided for various advanced engines, and the temperature of an engine combustion chamber exceeds 1600 ℃. Advanced missile rocket reentry, penetration warhead shape design and load design tasks all need to obtain high-precision temperature parameters under the conditions of ultrahigh temperature environment and limited space. Therefore, the ultra-high temperature calibration has important significance for effective temperature measurement and ensuring industrial design production and scientific experiments. Since the 70 s of the 20 th century, foreign temperature measurement and control technologies are rapidly developed under the promotion of computers and microelectronic technologies in response to the requirements of industrial control processes. The temperature measurement and control systems produced in Germany, Nimu, America, Sweden and the like have leading technology and are widely applied to various fields. In 1980, a dry body type calibration system, which divides a heating part into upper and lower parts and thus compensates for the heat loss of the calibrated system, was produced by amatek corporation (usa). Compared with the countries such as the Japanese, the American and the Germany, the temperature measurement and control system level in the domestic temperature calibration system is still very laggard and is only at the middle level of the last 80 th century of the countries. But for the ultra-high temperature calibration exceeding 1600 ℃, no high-precision and large-range solution is available at home and abroad.
The laser has the characteristics of high thermal efficiency, good uniformity, high conversion efficiency, high light emitting rate and the like, can realize non-contact heating, is an ideal radiation heating heat source, is applied to the field of temperature sensor calibration, and can greatly improve the temperature and efficiency of temperature sensor calibration.
SUMMERY OF THE UTILITY MODEL
In order to effectively solve the problem, an object of the utility model is to provide an ultra-high temperature sensor calibration system.
The technical scheme of the utility model as follows:
the ultra-high temperature sensor calibration system is characterized by comprising the following components in percentage by weight: the device comprises a sealed cavity, an environment control unit, a graphite soaking block, a heat source unit, a temperature measurement unit and a main control unit, wherein a laser transmission lens for allowing external laser to penetrate into is arranged on the sealed cavity, the graphite soaking block and the temperature measurement unit are arranged in the sealed cavity, the graphite soaking block is arranged in the irradiation range of the laser transmission lens, the temperature measurement unit is used for detecting the graphite soaking block, the heat source unit is arranged outside the sealed cavity, the heat source unit heats the graphite soaking block in the sealed cavity by transmitting laser through the laser transmission lens, and the environment control unit, the heat source unit and the temperature measurement unit are all electrically connected with the main control unit.
Optionally, a sensor placing hole and a temperature measuring hole are formed in the graphite soaking block, and the sensor placing hole and the temperature measuring hole are symmetrically arranged.
Optionally, a sensor for calibration is placed in the sensor placement hole, and the ratio of the depth to the diameter of the temperature measurement hole is greater than 6.
Optionally, the environment control unit comprises: the vacuumizing device and the inert gas filling device are both connected with the sealing cavity.
Optionally, the sealed cavity has a receiving space therein, and the sealed cavity provides a sealed environment for the internal components.
Optionally, the ultra-high temperature sensor calibration system further comprises a cooling unit, and the cooling unit is connected with the heat source unit and is used for cooling the heat source unit.
Optionally, the calibration system for the ultra-high temperature sensor further comprises a power supply, and the power supply is electrically connected with the heat source unit, the temperature measurement unit, the cooling unit and the main control unit of the environment control unit respectively for supplying power.
The beneficial effects of the utility model reside in that, the utility model discloses a but the highest temperature of ultra-high temperature sensor calibration system work is 2800 ℃, and the hole on the graphite soaking piece reaches blackbody chamber specific dimension through processing, and the radiance is approximately about 1, and the measured temperature is accurate, can realize the demarcation of equipment such as ultrasonic temperature sensor, thermocouple, infrared radiation thermometer, the main control unit makes the temperature field invariable through the temperature data regulation high power laser instrument of radiation thermometer, and this adjustment method is simple and easy, has fast, the temperature field is stable, characteristics such as the energy consumption is little, possesses higher using value.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is the schematic view of the sectional structure of the graphite soaking block of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1, a calibration system for an ultra-high temperature sensor has a working temperature of 20-2800 ℃, and comprises: sealed chamber 1, environmental control unit 2, graphite soaking block 3, heat source unit 4, temperature measurement unit 5 and main control unit 6, be provided with on the sealed chamber 1 and let the laser transmission lens 11 that outside laser jetted into, graphite soaking block 3 and temperature measurement unit 5 set up in the sealed chamber 1, graphite soaking block 3 sets up in the irradiation range of laser transmission lens 11, temperature measurement unit 5 is used for detecting graphite soaking block 3, heat source unit 4 sets up sealed chamber 1 is outside, heat source unit 4 sees through laser transmission lens 11 through the transmission laser and heats graphite soaking block 3 in the sealed chamber 1, environmental control unit 2, heat source unit 4 and temperature measurement unit 5 all with main control unit 6 electricity is connected.
As shown in fig. 1, the sealed cavity 1 has a containing space therein, the sealed cavity 1 provides a sealed environment for internal elements, and the sealed cavity 1 can bear heat radiation emitted by the graphite soaking block 3 at a high temperature of 2800 ℃, so that a gas leakage phenomenon does not occur. The laser transmission lens 11 can realize high-efficiency transmission of laser, the graphite soaking block 3 is heated, the laser transmission lens 11 realizes transmission of more than 90% of energy of the laser, and the graphite soaking block has the characteristic of high temperature resistance, and the transmission rate is not reduced along with the increase of the temperature.
As shown in fig. 1, the environment control unit 2 includes: evacuating device 21 and inert gas filling device 22, evacuating device 21 and inert gas filling device 22 all with sealed chamber 1 is connected, environment control unit 2 can control sealed chamber 1 environment, realizes the evacuation and the inert gas filling operation to sealed chamber 1, fills into inert gas and can keep 0.1MPa malleation.
As shown in fig. 1 and 2, a sensor placing hole 31 and a temperature measuring hole 32 are formed in the graphite soaking block 3, the sensor placing hole 31 and the temperature measuring hole 32 are symmetrically arranged, a sensor for calibration is placed in the sensor placing hole 31, the ratio of the depth to the diameter of the temperature measuring hole 32 is greater than 6, according to the blackbody cavity radiation principle, when the depth-diameter ratio of the deep hole is greater than 5, the radiance of the deep hole is about 1, the temperature of the two holes can be guaranteed to be equal by symmetrically arranging the sensor placing hole 31 and the temperature measuring hole 32, optionally, the bottom of the temperature measuring hole 32 is conical, the angle of the conical top is 120 °, the inner wall of the temperature measuring hole 32 is roughened, and the diffuse reflection of light is enhanced.
As shown in fig. 1, the heat source unit 4 includes a high-power laser, the high-power laser has good optical power distribution uniformity and small output power fluctuation, and the laser spot size can change with the change of the focal length, and can completely cover the surface of the graphite soaking block 3.
The ultra-high temperature sensor calibration system further comprises a cooling unit 7, wherein the cooling unit 7 is connected with the heat source unit 4 and is used for cooling the heat source unit 4.
As shown in fig. 1, the detection end of the temperature measurement unit 5 faces the temperature measurement hole 32 of the graphite soaking block 3 and detects the temperature measurement hole 32, and the temperature measurement unit 5 includes a radiation thermometer for feeding back temperature data of the temperature measurement hole 32.
As shown in fig. 1, the main control unit 6 may adopt an MCU or a single chip microcomputer, and a temperature control program is recorded therein, so as to control the temperature rise rate of the graphite soaking block 3.
The high-power laser, the radiation thermometer and the main control unit 6 can form a feedback control module, the radiation thermometer is used as temperature monitoring equipment of the graphite soaking block 3 to feed back real-time temperature to the main control unit 6, and the main control unit 6 controls the output current of the laser power supply 8 to further realize the adjustment of the laser power and realize the stable control of the temperature of the soaking block.
As shown in fig. 1, the calibration system for the ultra-high temperature sensor further includes a power supply 8, and the power supply 8 is electrically connected with the heat source unit 4, the temperature measuring unit 5, the cooling unit 7 and the main control unit 6 of the environment control unit 2, respectively, and is used for supplying power to each component.
The principle of the utility model is that, the high power laser is adopted as the excitation source, the graphite soaking block is heated by radiation, the temperature of the initial inner part of the graphite soaking block is even everywhere, and the temperature t is equal to the ambient atmospheric temperature0The physical properties thereof are equal to each other, such as rho (density), c (specific heat capacity), lambda (thermal conductivity, W/(m.K), and a (thermal diffusivity, m)2Is constant. According to the first law of thermodynamics and the Fourier law, the change rule of the temperature field of the graphite soaking block along with time and space is described mathematically as follows:
in the formula (I), the compound is shown in the specification,
is a laplacian operator, in a rectangular coordinate system,
under the condition that the geometric dimension and the boundary condition of the graphite soaking block are known, the temperature distribution and the constant heat current density q of the graphite soaking block at different moments can be determinedwThe relationship (2) of (c).
During calibration, a temperature sensor to be calibrated is placed in a sensor placing hole of the graphite soaking block, a radiation thermometer is aligned to a temperature measuring hole of the graphite soaking block, and laser emitted by a high-power laser is irradiated on the surface of the graphite soaking block through a laser transmission mirror to reach high temperature. After heating for a period of time, the graphite soaking block reaches a constant temperature state. The graphite soaking block comprises a temperature measuring hole and a sensor placing hole, the temperature measuring hole is a simulated black body, and according to the black body cavity radiation principle, when the depth-diameter ratio is greater than 5, the radiation rate of the deep hole is about 1. The radiation thermometer monitors the temperature in the sealed cavity and statically calibrates and calibrates the ultra-high temperature sensor by measuring the temperature of the simulated black body. Meanwhile, the main control unit adjusts the power of the laser according to the temperature of the radiation thermometer to reach a set temperature, and the vacuum or inert environment in the sealed cavity is realized by the vacuumizing device and the inert gas filling device.
The beneficial effects of the utility model reside in that, the utility model discloses a but the highest temperature of ultra-high temperature sensor calibration system work is 2800 ℃, and the hole on the graphite soaking piece reaches blackbody chamber specific dimension through processing, and the radiance is approximately about 1, and the measured temperature is accurate, can realize the demarcation of equipment such as ultrasonic temperature sensor, thermocouple, infrared radiation thermometer, the main control unit makes the temperature field invariable through the temperature data regulation high power laser instrument of radiation thermometer, and this adjustment method is simple and easy, has fast, the temperature field is stable, characteristics such as the energy consumption is little, possesses higher using value.
Claims (7)
1. The ultra-high temperature sensor calibration system is characterized by comprising the following components in percentage by weight: a sealing cavity (1), an environment control unit (2), a graphite soaking block (3), a heat source unit (4), a temperature measuring unit (5) and a main control unit (6), a laser transmission lens (11) for emitting external laser is arranged on the sealed cavity (1), the graphite soaking block (3) and the temperature measuring unit (5) are arranged in the sealing cavity (1), the graphite soaking block (3) is arranged in the irradiation range of the laser transmission lens (11), the temperature measuring unit (5) is used for detecting the graphite soaking block (3), the heat source unit (4) is arranged outside the sealed cavity (1), the heat source unit (4) heats the graphite soaking block (3) in the sealed cavity (1) by emitting laser through the laser transmission lens (11), the environment control unit (2), the heat source unit (4) and the temperature measuring unit (5) are electrically connected with the main control unit (6).
2. The system for calibrating the ultra-high temperature sensor according to claim 1, wherein a sensor placing hole (31) and a temperature measuring hole (32) are formed in the graphite soaking block (3), and the sensor placing hole (31) and the temperature measuring hole (32) are symmetrically arranged.
3. The system for calibrating the ultra-high temperature sensor according to claim 2, wherein a sensor for calibration is placed in the sensor placing hole (31), and the ratio of the depth to the diameter of the temperature measuring hole (32) is more than 6.
4. The system for calibrating an ultra high temperature sensor according to claim 1, wherein the environmental control unit (2) comprises: the vacuum pumping device (21) and the inert gas filling device (22) are connected with the sealing cavity (1).
5. The system for calibrating the ultra-high temperature sensor according to claim 1, wherein the sealed cavity (1) is provided with a containing space therein, and the sealed cavity (1) provides a sealed environment for internal elements.
6. The system for calibrating the UHT sensor according to claim 1, further comprising a cooling unit (7), wherein the cooling unit (7) is connected with the heat source unit (4) for cooling the heat source unit (4).
7. The system for calibrating the ultra-high temperature sensor according to claim 6, further comprising a power supply (8), wherein the power supply (8) is electrically connected with the environment control unit (2), the heat source unit (4), the temperature measurement unit (5), the cooling unit (7) and the main control unit (6) respectively for supplying power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020739566.7U CN211824827U (en) | 2020-05-08 | 2020-05-08 | Ultra-high temperature sensor calibration system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020739566.7U CN211824827U (en) | 2020-05-08 | 2020-05-08 | Ultra-high temperature sensor calibration system |
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| Publication Number | Publication Date |
|---|---|
| CN211824827U true CN211824827U (en) | 2020-10-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020739566.7U Expired - Fee Related CN211824827U (en) | 2020-05-08 | 2020-05-08 | Ultra-high temperature sensor calibration system |
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| Country | Link |
|---|---|
| CN (1) | CN211824827U (en) |
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2020
- 2020-05-08 CN CN202020739566.7U patent/CN211824827U/en not_active Expired - Fee Related
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Granted publication date: 20201030 |