CN103063702A - Method and device for testing laser absorptivity of powdery material - Google Patents
Method and device for testing laser absorptivity of powdery material Download PDFInfo
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- CN103063702A CN103063702A CN2013100018778A CN201310001877A CN103063702A CN 103063702 A CN103063702 A CN 103063702A CN 2013100018778 A CN2013100018778 A CN 2013100018778A CN 201310001877 A CN201310001877 A CN 201310001877A CN 103063702 A CN103063702 A CN 103063702A
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Abstract
The invention discloses a method and a device for testing the laser absorptivity of a powdery material, wherein the testing method mainly comprises the steps of drying powder, cleaning a heat transfer body (a sample table surface), coating a heat conduction silicone grease, laying the to-be-tested powder and testing the laser absorptivity, and the device mainly comprises a laser (1), a spectroscope (2), the heat transfer body (5), an insulating box body (6), a water containing box body (8), a laser power meter (9), temperature sensors (10 and 11), A/D converters (12 and 13), a singlechip (14) and a computer (15). The invention provides the method and the device for testing the laser absorptivity of the powdery material, so that the limitation that the present laser absorptivity is only applicable to a block material or a thin film on the block material is broken through and a foundation for pushing the theoretical research development and engineering practical application of the powder laser cladding technology is laid, and meanwhile, the method and the device have the characteristics of high testing precision, simplicity, feasibility, good generality and the like.
Description
Technical field
The present invention relates to a kind of material property detection method and device, especially a kind of dusty material laser absorption characteristic detecting method and device, specifically a kind of laser
MoltenThe micron of commonly using in the coating technique or method of testing and the device thereof of nanometer grade powder material laser absorptivity.
Background technology
Thereby the physical chemistry structure that the essence of Laser Processing is the laser energy that utilizes material to absorb changes material realizes certain processing purpose.Laser melting and coating technique is one of widely used laser processing technology in the engineering practice, and its employed cladding material can be divided into Powdered, paste, thread, bar-shaped and lamellar by the initial provision state, and wherein using maximum is dusty material.Therefore, characterizing or measure dusty material is laser absorption rate to the receptivity of laser, is in the industrial applications field of laser melting and coating technique or all significant in laser melting and coating technique theoretical research field.
At present, the measuring method of laser absorption rate mainly contains three classes.First kind method is by measuring the reflectivity of material, deducts reflectivity with 1 again and obtains the material absorptivity.The main research of this respect has: the principle of utilizing linearly polarized light after material surface reflection, can be modulated into elliptically polarized light come measurement of reflectivity and utilize integrating sphere method measurement of reflectivity (as, aerospace journal, 1983,3:89-104; A utility model patent of Changchun Institute of Optics, Fine Mechanics and Physics, CAS, 2004, publication number CN03212220.9; A patent of invention of Northwestern Polytechnical University, 2011, publication number CN102435582).The measurement mechanism of these class methods is more complicated all, utilize the method for polarization theory to need special polarization measuring apparatus, and the integrating sphere method needs integrating sphere and device that can the Quick Measurement laser energy, when large and measured material is higher to the reflectivity of laser when laser power, owing to cause easily the damage of integrating sphere inside surface, so the integrating sphere method has certain limitation.The Equations of The Second Kind method, then be the absorbing state of coming indirect research material according to the situation that laser action district materials behavior changes, these class methods mainly are to come laser absorption rate is evaluated indirectly by the physical dimension of measuring the laser heat action district, and these class methods generally can only be used for laser absorption rate is estimated qualitatively.The 3rd class methods are from the calorimetric angle, and the temperature variation by measuring material is also carried out corresponding calculation of thermodynamics and obtained laser absorption rate.The main research work of this respect has: utilize lumped-parameter method to carry out the calculating of absorptivity and utilize the unsteady-state heat transfer of a peacekeeping two dimension of method of finite difference learn model calculate absorptivity (as, tribology National Key Laboratory of Tsing-Hua University, Acta Physica Sinica, 2001,50(5): 856-859).Utilize lumped-parameter method to measure the laser absorption rate of material, this measuring method at first must satisfy the lumped parameter condition, i.e. there are the limitation such as the temperature of the temperature that requires material and copper matrix is consistent in the temperature of the thermotonus material by measuring the copper matrix.And aforementioned these existing methods all are only applicable to the film on block materials (usually block being made a thin slice) or the block materials, are difficult to the laser absorption rate of test powders material.
According to the knowledge of the applicant, up to the present, a kind of method of testing of dusty material laser absorption rate is not yet arranged and install available, cause the laser absorption rate that in the theoretical research of powder laser melting and coating technique and application to engineering practice, is difficult to the Efficient Characterization dusty material, limited to a certain extent the more widely application in the fields such as clean nearly shapings of part of powder laser melting and coating technique.
Summary of the invention
The objective of the invention is for present because of method of testing that a kind of dusty material laser absorption rate is not yet arranged and install available, so cause the laser absorption rate that in the theoretical research of powder laser melting and coating technique and application to engineering practice, is difficult to the Efficient Characterization dusty material, restrict powder laser melting and coating technique problem of widespread use more in the fields such as clean nearly shapings of part, invented a kind of method of testing and device thereof that can directly carry out the dusty material laser absorption rate of absorptivity detection to powder.
One of technical scheme of the present invention is:
A kind of method of testing of dusty material laser absorption rate is characterized in that it may further comprise the steps:
Step 1: place drying box dry in powder to be measured, baking temperature is 110-130 ℃, is no less than 6 hours drying time;
Step 2: thermal conductor 5 is put the powder surface clean to remove on it burs such as dust with acetone, the thermal conductor 5 after cleaning is put the powder surface uniform and is applied one deck heat-conducting silicone grease 4, and the thickness of heat-conducting silicone grease 4 is not more than 0.5 millimeter;
Step 3: adopt powder feeder powder feeding or the manual method that spreads powder, put the dried powder to be measured of uniform fold one deck on the powder surface at the thermal conductor 5 that is coated with heat-conducting silicone grease, heat-conducting silicone grease is covered the powder bed to be measured 3 that forms even compact by powder to be measured fully on the powder surface until thermal conductor 5 is put, and blows away unnecessary not adhering powder;
Step 4: the thermal conductor 5 that will be coated with powder bed to be measured places body of thermal insulating box 6, detect respectively the initial temperature of thermal conductor 5 and aqueous solution by thermal conductor temperature sensor 10 and water temperature sensor 11, transmit and be presented on the display of computing machine 15, when their initial temperature equates, this temperature is designated as
, can begin the laser absorption rate of test powders;
Step 5: open the optical gate of laser instrument 1, incident light is by behind the spectroscope 2, and a part of irradiation is on powder bed 3 to be measured, and another part light is injected laser powermeter 9, and laser powermeter 9 is with the data laser power that detects
Pass to computing machine 15; Powder particle is subject to by heat-conducting silicone grease 4 heat promptly being passed to thermal conductor 5 behind the Ear Mucosa Treated by He Ne Laser Irradiation in the powder bed 3 to be measured, temperature raises rapidly behind thermal conductor 5 absorbing heats, and thermal conductor 5 carries out heat interchange with the heat transferred aqueous solution with the aqueous solution in the casing 8 that is filled with water; Thermal conductor temperature sensor 10 is passed to thermal conductor A/D converter 12 with the measured physical quantity corresponding with thermal conductor 5 temperature variation (simulating signal is voltage), and thermal conductor A/D converter 12 is converted into the physical quantity that receives temperature variation (digital signal) and this temperature variation is passed to computing machine 15 and is presented on the display; The aqueous solution in the casing 8 of being filled with water absorbs thermal conductor 5 transmit the heat that comes after temperature raise, water temperature sensor 11 is passed to water body A/D converter 13 with the measured physical quantity corresponding with temperature variation aqueous solution (simulating signal is voltage), water body A/D converter 13 is converted into the physical quantity that receives temperature variation (digital signal) and this temperature variation is passed to single-chip microcomputer 14, and single-chip microcomputer 14 carries out the temperature data that receives to pass to computing machine 15 after the analyzing and processing and be presented on the display as the core of temperature acquisition system; Computing machine 15 is stored the data that receive at first respectively, then by temperature acquisition system software the aqueous temperature data that receive is recorded, analyzes, calculates the change curve that forms aqueous temperature, and the maximum temperature of record and demonstration aqueous solution
The data laser power of computing machine 15 by obtaining
And temperature
,
Can calculate the laser absorption rate ε of powder to be measured:
（2）
（3）
Wherein:
Spectroscopical light splitting rate for the power detection employing;
Be the quality of thermal conductor 5,
Quality for aqueous solution;
Initial temperature value for thermal conductor 5 and aqueous solution;
For thermal conductor 5 in initial temperature is
The time specific heat capacity,
For aqueous solution in initial temperature is
The time specific heat capacity;
Be the maximal value of aqueous temperature in the measuring process,
Be the aqueous temperature maximal value
The specific heat capacity of lower thermal conductor,
For aqueous solution in the maximum temperature value
The time specific heat capacity; T is the time of Ear Mucosa Treated by He Ne Laser Irradiation,
Laser power for the laser powermeter detection.
When powder feeder powder feeding or manual shop powder, if a powder feeding or spread the powder effect undesirable namely not yet fully uniform fold thermal conductor 5 put the lip-deep heat-conducting silicone grease 4 of powder, should adopt repeatedly powder feeding or spread powder, or adopt aid to make powder distribution even compact to be measured in shop powder process.
In the described powder laser absorption rate testing process, laser beam scans with annular trace irradiation on powder bed 3 to be measured, annular trace inner edge radius be thermal conductor 5 put the powder surface radius 1/2, the irradiation sweep length is the 75%-95% of thermal conductor 5 inner edge girths, and the annular trace width is not less than thermal conductor 5 and puts 1/10 of powder surface radius.
Two of technical scheme of the present invention is:
A kind of proving installation of dusty material laser absorption rate, it is characterized in that: it is mainly by laser instrument 1, spectroscope 2, thermal conductor 5, body of thermal insulating box 6, casing 8 is filled with water, laser powermeter 9, thermal conductor temperature sensor 10, water temperature sensor 11, thermal conductor A/D converter 12, water body A/D converter 13, single-chip microcomputer 14 and computing machine 15 form; Body of thermal insulating box 6 is the width rectangular parallelepiped identical with length dimension with the casing 8 that is filled with water, the height of casing 8 of being filled with water is the twice of body of thermal insulating box 6 height, body of thermal insulating box 6 centers have countersunk head through hole 7, casing 8 centers that are filled with water have the cylindric blind hole that is filled with water, and body of thermal insulating box 6 places on the casing 8 that is filled with water, rely on both identical location with length dimension of width, the cylindric blind hole central axis coaxial cable that is filled with water on the countersunk head through hole 7 on the body of thermal insulating box 6 and the casing 8 that is filled with water is arranged; Thermal conductor 5 places in the countersunk head through hole 7 on the body of thermal insulating box 6, and the lower end of thermal conductor 5 is inserted in the cylindric blind hole that is filled with water in the casing 8 that is filled with water and directly contacted with wherein aqueous solution; Thermal conductor temperature sensor 10 1 ends place in the countersunk head through hole 7, and the other end is connected on thermal conductor A/D converter 12 input ends; Water temperature sensor 11 1 ends place casing 8 centers that are filled with water to be filled with water in the cylindric blind hole and directly contact with aqueous solution, and the other end is connected on water body A/D converter 13 input ends; Water body A/D converter 13 output terminals link to each other with single-chip microcomputer 14; Laser powermeter 9, thermal conductor A/D converter 12 and the single-chip microcomputer 14 all data line by separately link to each other with computing machine 15.
Described thermal conductor 5 upper end diameter are greater than the diameter of lower end insertion end, and the countersunk head diameter of the countersunk head through hole 7 that upper end diameter and body of thermal insulating box 6 centers are offered matches, and the through-hole diameter of the countersunk head through hole 7 that lower end diameter and body of thermal insulating box 6 centers are offered matches; Simultaneously, be evenly equipped with 4 semicircle grooves at thermal conductor 5 upper end peripheries, making things convenient for thermal conductor 5 from the 7 interior taking-ups of countersunk head through hole, thereby change specimen; Be convenient to simultaneously thermal conductor temperature sensor 10 and contact with semicircle groove inwall, avoid because thermal conductor 5 and countersunk head through hole 7 exist tolerance clearance to cause test error due to temperature sensor 10 loose contacts.
After described thermal conductor 5 places the countersunk head through hole 7 on the body of thermal insulating box 6 interior, thermal conductor 5 put the upper surface that the powder surface is lower than body of thermal insulating box 6, this difference in height is the 1/3-1/5 of the countersunk head through hole 7 countersunk head height on the body of thermal insulating box 6.
After described body of thermal insulating box 6 and casing 8 combinations that are filled with water, for guaranteeing not misplace in the test process and easy disassembly adopts adhesive tape that it is tightened to an integral body or adopt the fastening structure that can split continuous.
The described cylindric blind hole inwall of being filled with water of casing 8 centers that is filled with water scribbles the insulating moulding coating of one deck waterproof, carries out exchange heat to prevent wherein aqueous solution and the external world.
The invention has the beneficial effects as follows:
(1) the invention provides a kind of method of testing and device thereof of dusty material laser absorption rate, broken through the limitation that existing laser absorption rate only is suitable for block materials or its upper film, for theory development and the application to engineering practice that promotes the powder laser melting and coating technique lays the foundation.Such as, in the existing powder laser cladding process Finite Element Simulation process, the laser absorption rates that adopt the empirical estimating dusty materials cause still not high enough problem of simulation accuracy more, adopt behind the method for the invention and the device thereof this problem will obtain essence ground and solve.
(2) the inventive method and device thereof, further import into absorbing heat in the aqueous solution by thermal conductor, adopt the absorptivity of measuring the aqueous solution temperature rise and indirectly obtaining powder in conjunction with the calorimetry ultimate principle, reduce the outside radiation-induced thermal loss of thermal conductor on the one hand and accounted for the ratio of total absorbing heat and then improved measuring accuracy, reduced on the other hand direct measurement thermal conductor temperature to the high limitation of performance requirement of sensor, data processor etc.
(3) be that 4 uniform semicircle grooves are creatively offered in the upper end of thermal conductor 5 at the specimen sample platform, reduce the damage probability that has made sample in the sample installation process thereby be convenient on the one hand to change specimen, also can effectively avoid on the other hand in the test process because the test error due to the temperature sensor loose contact.
(4) the inventive method is simple and easy to do, versatility good, be not only applicable to the detection of the laser absorption rate of the micron order that uses in all suitable laser melting coatings or nano level metal or non-metal powder, can be used for the test of the laser absorption rate of paste material, block materials and upper film thereof yet; The general easy acquisition of the required components and parts of described device, compact conformation, and by a large amount of theoretical analysises and exploitative experiment appropriate design laser irradiation trajectory parameters in the test process.
Description of drawings
Fig. 1 dusty material laser absorption rate of the present invention proving installation synoptic diagram.
Embodiment
The present invention is further illustrated below in conjunction with accompanying drawing and example.
Embodiment one.
As shown in Figure 1.
A kind of concrete steps of method of testing of dusty material laser absorption rate are as follows:
At first, place drying box dry in powder to be tested, baking temperature is 110-130 ℃, is no less than 6 hours drying time; Then, thermal conductor 5 is put the powder surface clean to remove on it burs such as dust with acetone, the thermal conductor 5 after cleaning is put the powder surface uniform and is applied one deck heat-conducting silicone grease 4, and the thickness of heat-conducting silicone grease 4 is not more than 0.5 millimeter; Then, adopt powder feeder powder feeding or the manual method that spreads powder, put the dried powder to be measured of uniform fold one deck on the powder surface at the thermal conductor 5 that is coated with heat-conducting silicone grease, heat-conducting silicone grease is covered the powder bed to be measured 3 that forms even compact by powder to be measured fully on the powder surface until thermal conductor 5 is put; If a powder feeding or spread the powder effect undesirable namely not yet fully uniform fold thermal conductor 5 put the lip-deep heat-conducting silicone grease 4 of powder, can adopt repeatedly powder feeding or spread powder, also can make powder distribution even compact to be measured at aids such as spreading powder process employing blade; The thermal conductor 5 that will be coated with again powder bed to be measured places body of thermal insulating box 6, detect respectively the initial temperature of thermal conductor 5 and aqueous solution by thermal conductor temperature sensor 10, water temperature sensor 11, transmit and be presented on the display of computing machine 15, when their initial temperature equates, this temperature is designated as
, can begin the laser absorption rate of test powders;
Open the optical gate of laser instrument 1, incident light is by behind the spectroscope 2, and a part of irradiation is on powder bed 3 to be measured, and another part light is injected laser powermeter 9, and laser powermeter 9 is with the data laser power that detects
Pass to computing machine 15; Powder particle is subject to by heat-conducting silicone grease 4 heat promptly being passed to thermal conductor 5 behind the Ear Mucosa Treated by He Ne Laser Irradiation in the powder bed 3 to be measured, temperature raises rapidly behind thermal conductor 5 absorbing heats, and thermal conductor 5 carries out heat interchange further with the heat transferred aqueous solution with the aqueous solution in the casing 8 that is filled with water; Ear Mucosa Treated by He Ne Laser Irradiation is not absorbed part on powder bed to be measured energy is to go out from its surface reflection; and this reflection is a kind of diffuse reflection; its energy majority is absorbed by media such as surrounding air or blanket gas, and the implication of body of thermal insulating box 6 thermal insulation is not absorb, transferring heat not.Thermal conductor temperature sensor 10 is passed to thermal conductor A/D converter 12 with the measured physical quantity corresponding with thermal conductor 5 temperature variation (simulating signal is voltage), and thermal conductor A/D converter 12 is converted into the physical quantity that receives temperature variation (digital signal) and this temperature variation is passed to computing machine 15 and is presented on the display; Being filled with water, temperature raises behind the aqueous solution absorbing heat in the casing 8, water temperature sensor 11 is passed to water body A/D converter 13 with the measured physical quantity corresponding with the temperature variation of aqueous solution (simulating signal is voltage), water body A/D converter 13 is converted into the physical quantity that receives temperature variation (digital signal) and this temperature variation is passed to single-chip microcomputer 14, and single-chip microcomputer 14 carries out after the analyzing and processing transmission as the core of temperature acquisition system with the temperature data that receives and passs computing machine 15 and be presented on the display; Computing machine 15 is stored the data that receive at first respectively, then by temperature acquisition system software the aqueous temperature data that receive are recorded, analyze, calculate the change curve that forms aqueous temperature, and the maximum temperature of record and demonstration aqueous solution (is designated as
); The data laser power of computing machine 15 by obtaining
And temperature
,
Can calculate according to following formula the laser absorption rate of powder to be measured.
（3）
Wherein: spectroscopical light splitting rate that power detection adopts is
Thermal conductor 5 quality are
, the quality of aqueous solution is
Thermal conductor 5 and aqueous solution initial temperature be
Thermal conductor 5 in initial temperature is
The time specific heat capacity be
, aqueous solution in initial temperature is
The time specific heat capacity be
In the measuring process, the maximal value of aqueous temperature is
, the specific heat capacity of thermal conductor is under this temperature
, the specific heat capacity of aqueous solution is
The time of Ear Mucosa Treated by He Ne Laser Irradiation is t, and the laser power that laser powermeter detects is
In the described powder laser absorption rate testing process, laser beam scans with annular trace irradiation on powder bed 3 to be measured, annular trace inner edge radius be thermal conductor 5 put the powder surface radius 1/2, the irradiation sweep length is the 75%-95% of inner edge girth, and the annular trace width is not less than thermal conductor 5 and puts 1/10 of powder surface radius.
Embodiment two.
As shown in Figure 1.
A kind of proving installation of dusty material laser absorption rate, it mainly is comprised of laser instrument 1, spectroscope 2, thermal conductor 5, body of thermal insulating box 6, the casing 8 that is filled with water, laser powermeter 9, thermal conductor temperature sensor 10, water temperature sensor 11, thermal conductor A/D converter 12, water body A/D converter 13, single-chip microcomputer 14 and computing machine 15; As shown in Figure 1, thermal conductor 5 is pillow block shape structure, the upper end is used for smearing an end diameter of heat-conducting silicone grease 4 and bonding powder bed 3 to be measured greater than the diameter of lower end for an end of the cylindric blind hole that is filled with water of inserting the casing 8 that is filled with water, shown in left side among Fig. 1, the countersunk head diameter of the countersunk head through hole 7 that thermal conductor 5 upper end diameter and body of thermal insulating box 6 centers are offered matches, the through-hole diameter of the countersunk head through hole 7 that lower end diameter and body of thermal insulating box 6 centers are offered matches, be evenly equipped with 4 semicircle grooves at thermal conductor 5 upper end peripheries, to make things convenient for thermal conductor 5 from the 7 interior taking-ups of countersunk head through hole, thereby replacing specimen, be convenient to simultaneously thermal conductor temperature sensor 10 and contact with semicircle groove inwall, avoid because thermal conductor 5 and countersunk head through hole 7 exist tolerance clearance to cause test error due to 10 loose contacts of thermal conductor temperature sensor.Body of thermal insulating box 6 is the width rectangular parallelepiped identical with length dimension with the casing 8 that is filled with water, the height of casing 8 of being filled with water is the twice of body of thermal insulating box 6 height, body of thermal insulating box 6 centers have countersunk head through hole 7, casing 8 centers that are filled with water have the cylindric blind hole that is filled with water, this cylindric blind hole inwall that is filled with water scribbles the insulating moulding coating of one deck waterproof, carries out exchange heat to prevent wherein aqueous solution and the external world; To the casing 8 that is filled with water be a center with the rectangular parallelepiped of cylindric blind hole, in test process, only in cylinder, be filled with water, remainder is entity.After thermal conductor 5 places the countersunk head through hole 7 on the body of thermal insulating box 6 interior, thermal conductor 5 put the upper surface that the powder surface is lower than body of thermal insulating box 6, this difference in height is the 1/3-1/5 of the countersunk head through hole 7 countersunk head height on the body of thermal insulating box 6.Body of thermal insulating box 6 places on the casing 8 that is filled with water, the fastening structure that maybe can split by adhesive tape between the two is connected to an assembly that can prevent the high insulating effect that heat leaks, rely on both identical location with length dimension of width, the cylindric blind hole central axis coaxial cable that is filled with water on the countersunk head through hole 7 on the body of thermal insulating box 6 and the casing 8 that is filled with water is arranged; Thermal conductor 5 places in the countersunk head through hole 7 on the body of thermal insulating box 6, and the lower end of thermal conductor 5 is inserted in the cylindric blind hole that is filled with water in the casing 8 that is filled with water and directly contacted with wherein aqueous solution; Thermal conductor temperature sensor 10 1 ends place in the countersunk head through hole 7, and the other end is connected on thermal conductor A/D converter 12 input ends; Water temperature sensor 11 1 ends place casing 8 centers that are filled with water to be filled with water in the cylindric blind hole and directly contact with aqueous solution, and the other end is connected on water body A/D converter 13 input ends; Water body A/D converter 13 output terminals link to each other with single-chip microcomputer 14; Laser powermeter 9, thermal conductor A/D converter 12 and the single-chip microcomputer 14 all data line by separately link to each other with computing machine 15.
Part that the present invention does not relate to such as A/D converter, single-chip microcomputer, power meter etc. all prior art that maybe can adopt same as the prior art are realized.
Claims (8)
1. the method for testing of a dusty material laser absorption rate is characterized in that it may further comprise the steps:
Step 1: place drying box dry in powder to be measured, baking temperature is 110-130 ℃, is no less than 6 hours drying time;
Step 2: thermal conductor (5) is put the powder surface clean to remove on it burs such as dust with acetone, the thermal conductor after cleaning (5) is put the powder surface uniform and is applied one deck heat-conducting silicone grease (4), and the thickness of heat-conducting silicone grease (4) is not more than 0.5 millimeter;
Step 3: adopt powder feeder powder feeding or the manual method that spreads powder, put the dried powder to be measured of uniform fold one deck on the powder surface being coated with the thermal conductor of heat-conducting silicone grease (5), heat-conducting silicone grease is covered the powder bed to be measured (3) that forms even compact by powder to be measured fully on the powder surface until thermal conductor (5) is put, and blows away unnecessary not adhering powder;
Step 4: the thermal conductor (5) that will be coated with powder bed to be measured places body of thermal insulating box (6), detect respectively the initial temperature of thermal conductor (5) and aqueous solution by thermal conductor temperature sensor (10) and water temperature sensor (11), transmit and be presented on the display of computing machine (15), when their initial temperature equates, this temperature is designated as
, can begin the laser absorption rate of test powders;
Step 5: open the optical gate of laser instrument (1), incident light is by behind the spectroscope (2), and a part of irradiation is on powder bed to be measured (3), and another part light is injected laser powermeter (9), and laser powermeter (9) is with the data laser power that detects
Pass to computing machine (15); Powder particle is subject to by heat-conducting silicone grease (4) heat promptly being passed to thermal conductor (5) behind the Ear Mucosa Treated by He Ne Laser Irradiation in the powder bed to be measured (3), temperature raises rapidly behind thermal conductor (5) absorbing heat, and thermal conductor (5) carries out heat interchange with the heat transferred aqueous solution with the aqueous solution in the casing (8) that is filled with water; Thermal conductor temperature sensor (10) is passed to thermal conductor A/D converter (12) with the measured physical quantity corresponding with thermal conductor (5) temperature variation, and thermal conductor A/D converter (12) is converted into the physical quantity that receives temperature variation and this temperature variation is passed to computing machine (15) and is presented on the display; Temperature raise after the aqueous solution in the casing (8) of being filled with water absorbed the heat that thermal conductor (5) transmission comes, water temperature sensor (11) is passed to water body A/D converter (13) with the measured physical quantity corresponding with temperature variation aqueous solution, water body A/D converter (13) is converted into the physical quantity that receives temperature variation and this temperature variation is passed to single-chip microcomputer (14), and single-chip microcomputer (14) carries out the temperature data that receives to pass to computing machine (15) after the analyzing and processing and be presented on the display as the core of temperature acquisition system; Computing machine (15) is stored the data that receive at first respectively, then by temperature acquisition system software the aqueous temperature data that receive are recorded, analyze, calculate the change curve that forms aqueous temperature, and the maximum temperature of record and demonstration aqueous solution
The data laser power of computing machine (15) by obtaining
And temperature
,
Can calculate the laser absorption rate ε of powder to be measured:
（1）
（4）
Wherein:
Spectroscopical light splitting rate for the power detection employing;
Be the quality of thermal conductor (5),
Quality for aqueous solution;
Initial temperature value for thermal conductor (5) and aqueous solution;
For thermal conductor (5) in initial temperature is
The time specific heat capacity,
For aqueous solution in initial temperature is
The time specific heat capacity;
Be the maximal value of aqueous temperature in the measuring process,
Be the aqueous temperature maximal value
The specific heat capacity of lower thermal conductor,
For aqueous solution in the maximum temperature value
The time specific heat capacity; T is the time of Ear Mucosa Treated by He Ne Laser Irradiation,
Laser power for the laser powermeter detection.
2. method of testing according to claim 1, it is characterized in that: when powder feeder powder feeding or manual shop powder, if a powder feeding or spread the powder effect undesirable namely not yet fully uniform fold thermal conductor (5) put the lip-deep heat-conducting silicone grease of powder (4), should adopt repeatedly powder feeding or spread powder, or adopt aid to make powder distribution even compact to be measured in shop powder process.
3. method of testing according to claim 1, it is characterized in that: in the described powder laser absorption rate testing process, laser beam upward scans with annular trace irradiation at powder bed to be measured (3), annular trace inner edge radius is that thermal conductor (5) is put 1/2 of powder surface radius, the irradiation sweep length is the 75%-95% of thermal conductor (5) inner edge girth, and the annular trace width is not less than thermal conductor (5) and puts 1/10 of powder surface radius.
4. the proving installation of a dusty material laser absorption rate, it is characterized in that: it is mainly by laser instrument (1), spectroscope (2), thermal conductor (5), body of thermal insulating box (6), the casing that is filled with water (8), laser powermeter (9), thermal conductor temperature sensor (10), water temperature sensor (11), thermal conductor A/D converter (12), water body A/D converter (13), single-chip microcomputer (14) and computing machine (15) form; Body of thermal insulating box (6) is the width rectangular parallelepiped identical with length dimension with the casing that is filled with water (8), the height of casing (8) of being filled with water is the twice of body of thermal insulating box (6) height, body of thermal insulating box (6) center has countersunk head through hole (7), casing (8) center that is filled with water has the cylindric blind hole that is filled with water, and body of thermal insulating box (6) places on the casing that is filled with water (8), rely on both identical location with length dimension of width, the cylindric blind hole central axis coaxial cable that is filled with water on the countersunk head through hole (7) on the body of thermal insulating box (6) and the casing that is filled with water (8) is arranged; Thermal conductor (5) places in the countersunk head through hole (7) on the body of thermal insulating box (6), and the lower end of thermal conductor (5) is inserted in the cylindric blind hole that is filled with water in the casing (8) that is filled with water and directly contacted with wherein aqueous solution; Thermal conductor temperature sensor (10) one ends place in the countersunk head through hole (7), and the other end is connected on thermal conductor A/D converter (12) input end; Water temperature sensor (11) one ends place the casing that is filled with water (8) center to be filled with water in the cylindric blind hole and directly contact with aqueous solution, and the other end is connected on water body A/D converter (13) input end; Water body A/D converter (13) output terminal links to each other with single-chip microcomputer (14); Laser powermeter (9), thermal conductor A/D converter (12) and single-chip microcomputer (14) all data line by separately link to each other with computing machine (15).
5. proving installation according to claim 4, it is characterized in that: described thermal conductor (5) upper end diameter is greater than the diameter of lower end insertion end, the countersunk head diameter of the countersunk head through hole (7) that upper end diameter and body of thermal insulating box (6) center is offered matches, and the through-hole diameter of the countersunk head through hole (7) that lower end diameter and body of thermal insulating box (6) center is offered matches; Simultaneously, periphery is evenly equipped with 4 semicircle grooves in thermal conductor (5) upper end, takes out in countersunk head through hole (7) to make things convenient for thermal conductor (5), thereby changes specimen; Be convenient to simultaneously thermal conductor temperature sensor (10) and contact with semicircle groove inwall, avoid because thermal conductor (5) and countersunk head through hole (7) exist tolerance clearance to cause test error due to temperature sensor (10) loose contact.
6. proving installation according to claim 4, it is characterized in that: after described thermal conductor (5) places the countersunk head through hole (7) on the body of thermal insulating box (6) interior, thermal conductor (5) put the upper surface that the powder surface is lower than body of thermal insulating box (6), this difference in height is the 1/3-1/5 of countersunk head through hole (7) the countersunk head height on the body of thermal insulating box (6).
7. proving installation according to claim 4, it is characterized in that: after the combination of described body of thermal insulating box (6) and the casing that is filled with water (8), for guaranteeing not misplace in the test process and easy disassembly adopts adhesive tape that it is tightened to an integral body or adopt the fastening structure that can split continuous.
8. proving installation according to claim 4, it is characterized in that: the cylindric blind hole inwall that is filled with water of the described casing that is filled with water (8) center scribbles the insulating moulding coating of one deck waterproof, carries out exchange heat to prevent wherein aqueous solution and the external world.
Priority Applications (1)
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104198520A (en) * | 2014-09-03 | 2014-12-10 | 北京卫星环境工程研究所 | Technology for ensuring high heat conduction efficiency of traveling-wave tube in thermal test |
| CN105758820A (en) * | 2016-02-29 | 2016-07-13 | 陕西理工学院 | Test device and test method for material laser absorptivity |
| CN110441124A (en) * | 2019-07-24 | 2019-11-12 | 湖南红太阳新能源科技有限公司 | Laser heating device and heating means for atomic spin measurement of magnetic field |
| CN110940850A (en) * | 2019-12-13 | 2020-03-31 | 永固集团股份有限公司 | On-line monitoring method and system for electric power fitting power and storage medium |
| CN111198161A (en) * | 2020-02-21 | 2020-05-26 | 南京理工大学 | Device and method for measuring laser absorption rate of powder |
| CN111595783A (en) * | 2020-05-29 | 2020-08-28 | 上海交通大学 | Material laser absorption rate measuring system and method |
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| CN114062430A (en) * | 2021-11-03 | 2022-02-18 | 北京工业大学 | Method for measuring ultrafast laser absorption rate of powder material |
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| CN2658729Y (en) * | 2003-03-26 | 2004-11-24 | 中国科学院长春光学精密机械与物理研究所 | Absorption rate measuring device |
| CN102435582A (en) * | 2011-10-14 | 2012-05-02 | 西安工业大学 | High precision laser absorptivity measuring device |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2658729Y (en) * | 2003-03-26 | 2004-11-24 | 中国科学院长春光学精密机械与物理研究所 | Absorption rate measuring device |
| CN102435582A (en) * | 2011-10-14 | 2012-05-02 | 西安工业大学 | High precision laser absorptivity measuring device |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104198520A (en) * | 2014-09-03 | 2014-12-10 | 北京卫星环境工程研究所 | Technology for ensuring high heat conduction efficiency of traveling-wave tube in thermal test |
| CN105758820A (en) * | 2016-02-29 | 2016-07-13 | 陕西理工学院 | Test device and test method for material laser absorptivity |
| CN110441124A (en) * | 2019-07-24 | 2019-11-12 | 湖南红太阳新能源科技有限公司 | Laser heating device and heating means for atomic spin measurement of magnetic field |
| CN110940850A (en) * | 2019-12-13 | 2020-03-31 | 永固集团股份有限公司 | On-line monitoring method and system for electric power fitting power and storage medium |
| CN111198161A (en) * | 2020-02-21 | 2020-05-26 | 南京理工大学 | Device and method for measuring laser absorption rate of powder |
| CN111595783A (en) * | 2020-05-29 | 2020-08-28 | 上海交通大学 | Material laser absorption rate measuring system and method |
| CN111595783B (en) * | 2020-05-29 | 2021-08-31 | 上海交通大学 | Material laser absorption rate measuring system and method |
| CN112067658A (en) * | 2020-10-10 | 2020-12-11 | 桂林电子科技大学 | Laser absorption rate measuring device for metal material changing with temperature |
| CN114062430A (en) * | 2021-11-03 | 2022-02-18 | 北京工业大学 | Method for measuring ultrafast laser absorption rate of powder material |
| CN114062430B (en) * | 2021-11-03 | 2023-11-24 | 北京工业大学 | Method for measuring ultra-fast laser absorptivity of powder material |
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