CN107907247B - A kind of big hot-fluid laser calibrating equipment - Google Patents
A kind of big hot-fluid laser calibrating equipment Download PDFInfo
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- CN107907247B CN107907247B CN201711203986.2A CN201711203986A CN107907247B CN 107907247 B CN107907247 B CN 107907247B CN 201711203986 A CN201711203986 A CN 201711203986A CN 107907247 B CN107907247 B CN 107907247B
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- flow transducer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K19/00—Testing or calibrating calorimeters
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- Investigating Or Analysing Materials By Optical Means (AREA)
- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Abstract
The invention discloses a kind of big hot-fluid laser calibrating equipments, including laser cell, the two sides of the laser cell are symmetrically installed with vacuum chamber, and wherein the vacuum chamber of side is for installing standard heat flow transducer, and the vacuum chamber of the other side is for installing experiment heat flow transducer；The laser cell is used for standard heat flow transducer and experiment heat flow transducer irradiation laser to its two sides to provide identical hot-fluid environment.Big hot-fluid laser calibrating equipment of the invention has many advantages, such as to be able to carry out big hot-fluid calibration and calibration efficiency is high.
Description
Technical field
The invention mainly relates to sensor calibration technique fields, refer in particular to a kind of big hot-fluid laser calibrating equipment.
Background technique
Hot-fluid calibration is in the design of aerospace weapon equipment thermal protection system, Aerodynamic Heating configuration design and Thermal Power Engineering kiln
Design of heat transfer etc. is widely used, and the application of hot-fluid calibration is intended to the actual use operating condition item of big hot-fluid dynamic calibration
Part, existing heat flow transducer calibrating installation carry out hot-fluid calibration using pyrographite plate in air.It passes through in the apparatus
The pyrographite plate two sides for crossing special processing can provide symmetrical hot-fluid, and symmetric position places standard heat flow transducer and experiment
Heat flow transducer completes experiment heat flow transducer by contrast standard heat flow transducer and experiment heat flow transducer signal output
Calibration.The device is the problem is that highest 2MW/m can only be carried out2Hot-fluid calibration, be not able to satisfy the hot-fluid school of higher amount journey
Quasi need, while not can be carried out dynamic heat flux calibration.In actual application, it is higher than 2MW/m2Big hot-fluid calibration it is non-
It is often important, while the process of dynamic heat flux calibration more meets engineer application reality.
Summary of the invention
The technical problem to be solved in the present invention is that, for technical problem of the existing technology, the present invention provides one
Kind is able to carry out the big hot-fluid laser calibrating equipment that big hot-fluid is calibrated and calibration efficiency is high.
In order to solve the above technical problems, technical solution proposed by the present invention are as follows:
A kind of big hot-fluid laser calibrating equipment, including laser cell, the two sides of the laser cell are symmetrically installed with vacuum
Chamber, wherein the vacuum chamber of side is for installing standard heat flow transducer, and the vacuum chamber of the other side is for installing experiment hot
Flow sensor；The laser cell is used for standard heat flow transducer and experiment heat flow transducer irradiation laser to its two sides to mention
For identical hot-fluid environment.
As a further improvement of the above technical scheme:
The laser cell is laser.
Turntable is installed, each turntable is corresponding with independent first actuator, the circle of the turntable in the vacuum chamber
Be equipped in week it is multiple for installing the interfaces of heat flow transducer, the turntable corresponding first actuator be rotated by so that
One of heat flow transducer is in calibrating position on turntable.
First actuator includes actuator and drive rod, and one end of the drive rod is connected with actuator, the other end
It is connected with turntable.
Chopper wheel is equipped in each vacuum chamber, each chopper wheel is located at the laser cell and heat flow transducer
Between and be oppositely arranged；Two chopper wheels pass through same second actuator driving synchronous rotary.
The chopper wheel includes muti-piece sectorial block, and muti-piece sectorial block is along the circumferential direction distributed.
Second actuator includes driving box, the first drive rod, the second drive rod and third drive rod, and described first passes
Lever, which is arranged in the two sides of the driving box and is driven by driving box, to be rotated, one end of second drive rod and the first transmission
The one end fits of bar cooperation transmission connection, the other end and third drive rod are sequentially connected, the other end of third drive rod and modulation
Disk is fixedly connected, wherein each cooperation transmission connection is two angular wheel cooperation transmissions.
It further include control unit and acquisition unit, the acquisition unit is spread with standard heat flow transducer and experiment hot respectively
Sensor is connected, is compared for acquiring heat flow signal and being sent to control unit.
Compared with the prior art, the advantages of the present invention are as follows:
Big hot-fluid laser calibrating equipment of the invention is used as heat source, output facula collection using laser cell (such as laser)
In, energy loss is small and stability is good, be able to carry out the calibration of big hot-fluid and improve the accuracy of hot-fluid calibration.In vacuum chamber
Turntable on multiple heat flow transducers can be installed, meet calibration more experiment heat flow transducers the needs of, improve testing efficiency.
Detailed description of the invention
Fig. 1 is schematic perspective view of the invention.
Fig. 2 is frame assumption diagram of the invention.
Fig. 3 is the structural schematic diagram of the second actuator in the present invention.
Figure label indicates: 1, laser cell；2, vacuum chamber；3, standard heat flow transducer；4, heat flow transducer is tested；
5, chopper wheel；51, the second actuator；511, driving box；512, the first drive rod；513, the second drive rod；514, third is driven
Bar；515, angular wheel；6, turntable；61, the first actuator；7, mechanical pump；8, digital voltmeter；9, computer；10, electric-controlled
System processed；11, gas control system.
Specific embodiment
Below in conjunction with Figure of description and specific embodiment, the invention will be further described.
As shown in Figure 1 to Figure 3, the big hot-fluid laser calibrating equipment of the present embodiment, including laser cell 1, laser cell 1
Two sides are symmetrically installed with vacuum chamber 2, and wherein the vacuum chamber 2 of side is for installing standard heat flow transducer 3, the other side it is true
Plenum chamber 2 is for installing experiment heat flow transducer 4；Laser cell 1 is used for standard heat flow transducer 3 and experiment hot to its two sides
Flow sensor 4 irradiates laser to provide identical hot-fluid environment.Big hot-fluid laser calibrating equipment of the invention, using laser cell
1 (such as laser) is used as heat source, and output facula is concentrated, energy loss is small and stability is good, is able to carry out big hot-fluid calibration and mentions
The high accuracy of hot-fluid calibration.
In the present embodiment, turntable 6 being installed in vacuum chamber 2, each turntable 6 is corresponding with independent first actuator 61,
The circumference of turntable 6 is equipped with multiple interfaces for being used to install heat flow transducer, and turntable 6 is under the driving of corresponding first actuator 61
Rotation is so that one of heat flow transducer is in calibrating position on turntable 6.As shown in Figure 1, there are five being uniformly distributed on turntable 6
Interface, the heat flow transducer that different type or range are mounted on interface will need sensor to be tested when testing
The top is turned to, is in identical optical path with the optical path of laser, is spread to meet and can calibrate more experiment hots
The demand of sensor 4 improves testing efficiency.Wherein the first actuator 61 includes actuator (not shown) and drive rod 611, is passed
One end of lever 611 is connected with actuator, and the other end is connected with turntable 6, and drive rod 611 rotates under the driving of the driving member, from
And turntable 6 is driven to rotate.
In the present embodiment, chopper wheel 5 is equipped in each vacuum chamber 2, each chopper wheel 5 is located at laser cell 1 and hot-fluid passes
It between sensor and is oppositely arranged, chopper wheel 5 includes muti-piece sectorial block, and muti-piece sectorial block is along the circumferential direction distributed；Two chopper wheels 5 are
It is driven and is rotated by same second actuator 51；The rotation of chopper wheel 5 can make the static heat of laser circulate and become Dynamic Thermal
It flows, and adjusts the change frequency of dynamic heat flux by the velocity of rotation of chopper wheel 5.The chopper wheel 5 of laser two sides passes through
The same driving of second actuator 51 rotation can guarantee that two chopper wheels 5 keep synchronous and same-phase rotates, to guarantee laser
The standard heat flow transducer 3 of two sides with experiment heat flow transducer 4 be under synchronous hot-fluid environment, improve calibration reliability and
Accuracy.Wherein the second actuator 51 includes driving box 511, the first drive rod 512, the second drive rod 513 and third drive rod
514, the first drive rod 512 is arranged in the two sides of driving box 511 and is rotated by the driving of driving box 511, the second drive rod 513
One end and the cooperation of the first drive rod 512 are sequentially connected, and the one end fits of the other end and third drive rod 514 are sequentially connected, third
The other end of drive rod 514 is fixedly connected with chopper wheel 5, wherein each cooperation transmission connection is that two angular wheels 515 cooperate
Transmission.
Further include control unit and acquisition unit in the present embodiment, acquisition unit respectively with standard heat flow transducer 3 and real
Heat flow transducer 4 is tested to be connected, be compared for acquiring heat flow signal and being sent to control unit.
Working principle is, experiment heat flow transducer 4 and standard heat flow transducer 3 by being placed under symmetrical hot-fluid environment,
Calibration experiments heat flow transducer 4 is exported according to the signal of standard heat flow transducer 3.Utilize the coefficient C of standard heat flow transducer 30
With output voltage E0, so that it may the symmetrical heat flow density q for calculating application, according to experiment heat flow transducer 4 output voltage E to
It can determine the coefficient C of heat flow transducer to be calibrated, it may be assumed that
In formula: C --- the coefficient of experiment heat flow transducer 4；
C0The coefficient of-standard heat flow transducer 3；
Q-heat flow density；
E-experiment heat flow transducer 4 output voltage；
E0The output voltage of-standard heat flow transducer 3；
In use, standard heat flow transducer 3 and experiment heat flow transducer 4 are installed on turntable 6 by installing interface, two
Turntable 6 and superpower laser are in equidistant position, it is made to receive identical application hot-fluid.The turntable 6 of laser two sides is distinguished
For switching and being accurately positioned standard heat flow transducer 3 and test the position of heat flow transducer 4, make the standard hot-fluid that two sides are different
Sensor 3 and experiment heat flow transducer 4 enter optical path, while meeting the standard heat flow transducer that can install different ranges
3 and calibrate more experiment heat flow transducers 4 demand.Standard heat flow transducer 3 and experiment heat flow transducer 4 and acquisition unit
(such as digital voltmeter 8) connection, for acquiring the output of heat flow signal, digital voltmeter 8 and control unit (such as computer 9) are even
It connects, for the control of test program and the comparison analysis of test data.
Electric control system 10 and gas control system 11 are opened, is filled with inert gas (nitrogen or argon to vacuum chamber 2
Gas), while the gas being discharged in vacuum chamber 2, main component is inert gas in several minutes of rear vacuum chambers 2, and air only accounts for
Few part.It opens mechanical pump 7 to vacuumize vacuum chamber 2, the vacuum degree of vacuum chamber 2 is made to be maintained at 0.1Pa or so.
Electric control system 10 powers to superpower laser, by the voltage and current value of control input, makes swashing for superpower laser
Optical output power makes the standard heat flow transducer 3 and experiment hot-fluid to be calibrated of suitable range by adjusting turntable 6 to target value
Sensor 4 is in the position for receiving laser output, and open signal acquisition software utilizes 8 synchronous acquisition standard hot of digital voltmeter
The signal output of flow sensor 3 and experiment heat flow transducer 4, analyzes output signal using computer 9, combined standard heat
The case where standard hot-fluid and voltage signal of the available experiment heat flow transducer 4 of the sensitivity of flow sensor 3 export, passes through electricity
Gas control system 10, which adjusts input voltage and input current value, can obtain the hot-fluid of experiment heat flow transducer 4 and the calibration curve of voltage,
To carry out hot-fluid calibration to sensor.The switching that can realize the standard heat flow transducer 3 of different ranges by adjusting turntable 6,
Turntable 6 is adjusted in hot-fluid calibration process can realize that different experiment heat flow transducers 4 switches and then calibrate different experiment hots
Flow sensor 4.
In dynamic heat flux calibration process, while the chopper wheel 5 for correcting laser two sides of linking, keep two sides chopper wheel 5 same
Phase links with revolving speed, after the symmetrical laser signal of superpower laser two sides is stablized, standard heat flow transducer 3 and experiment hot-fluid
Sensor 4 is under the dynamic heat flux irradiation of equal-wattage, synchronous acquisition standard heat flow transducer 3 and experiment heat flow transducer
4 signal output, and analyzed by test software, complete the dynamic heat flux calibration of sensor.
Big hot-fluid laser calibrating equipment of the invention carries out heat flow transducer school by the hot-fluid that superpower laser generates
Standard, superpower laser output energy is big, output facula is concentrated and stability is good, can reach output upper limit 9MW/m2Big energy
Calorimetric stream solves existing hot-fluid calibrating installation graphite planar and generates hot-fluid not higher than 2MW/m2Limitation.
The above is only the preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-described embodiment,
All technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
For those of ordinary skill, several improvements and modifications without departing from the principles of the present invention should be regarded as protection of the invention
Range.
Claims (6)
1. a kind of big hot-fluid laser calibrating equipment, which is characterized in that including laser cell (1), the two sides of the laser cell (1)
Vacuum chamber (2) are symmetrically installed with, wherein the vacuum chamber (2) of side is used to install standard heat flow transducer (3), the other side
Vacuum chamber (2) is for installing experiment heat flow transducer (4)；The laser cell (1) to the standard hot of its two sides for spreading
Sensor (3) and experiment heat flow transducer (4) irradiation laser are to provide identical hot-fluid environment；
The laser cell (1) is laser；
It is equipped with turntable (6) in the vacuum chamber (2), each turntable (6) is corresponding with independent first actuator (61), described
The circumference of turntable (6) is equipped with multiple interfaces for being used to install heat flow transducer, and the turntable (6) is in corresponding first actuator
(61) be rotated by so that one of heat flow transducer is in calibrating position on turntable (6).
2. big hot-fluid laser calibrating equipment according to claim 1, which is characterized in that first actuator (61) includes
One end of actuator and drive rod (611), the drive rod (611) is connected with actuator, and the other end is connected with turntable (6).
3. big hot-fluid laser calibrating equipment according to claim 1 or 2, which is characterized in that in each vacuum chamber (2)
It is equipped with chopper wheel (5), each chopper wheel (5) is between the laser cell (1) and heat flow transducer and is oppositely arranged；
Two chopper wheels (5) drive synchronous rotary by same second actuator (51).
4. big hot-fluid laser calibrating equipment according to claim 3, which is characterized in that the chopper wheel (5) includes muti-piece
Sectorial block, muti-piece sectorial block are along the circumferential direction distributed.
5. big hot-fluid laser calibrating equipment according to claim 3, which is characterized in that second actuator (51) includes
Driving box (511), the first drive rod (512), the second drive rod (513) and third drive rod (514), first drive rod
(512) two sides in the driving box (511) are set and by driving box (511) driving rotation, second drive rod (513)
One end and the first drive rod (512) cooperation be sequentially connected, the one end fits of the other end and third drive rod (514), which are driven, to be connected
It connects, the other end of third drive rod (514) is fixedly connected with chopper wheel (5), wherein each cooperation transmission connection is two tapers
Gear (515) cooperation transmission.
6. big hot-fluid laser calibrating equipment according to claim 1 or 2, which is characterized in that further include control unit and adopting
Collect unit, the acquisition unit is connected, with standard heat flow transducer (3) and experiment heat flow transducer (4) for acquiring heat respectively
It flows signal and is sent to control unit and be compared.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711203986.2A CN107907247B (en) | 2017-11-27 | 2017-11-27 | A kind of big hot-fluid laser calibrating equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711203986.2A CN107907247B (en) | 2017-11-27 | 2017-11-27 | A kind of big hot-fluid laser calibrating equipment |
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| CN107907247A CN107907247A (en) | 2018-04-13 |
| CN107907247B true CN107907247B (en) | 2019-10-25 |
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| CN102539019A (en) * | 2012-01-05 | 2012-07-04 | 北京东方计量测试研究所 | Temperature measurement and calibration platform in space vacuum environment |
| WO2014016273A2 (en) * | 2012-07-24 | 2014-01-30 | Commissariat Al'energie Atomique Et Aux Energies Alternatives | Self-calibrating calorimeter using electrical substitution |
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| CN107907247A (en) | 2018-04-13 |
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