CN202735279U - Surface-mounted sensor and heat absorption coefficient measuring device - Google Patents
Surface-mounted sensor and heat absorption coefficient measuring device Download PDFInfo
- Publication number
- CN202735279U CN202735279U CN 201220360421 CN201220360421U CN202735279U CN 202735279 U CN202735279 U CN 202735279U CN 201220360421 CN201220360421 CN 201220360421 CN 201220360421 U CN201220360421 U CN 201220360421U CN 202735279 U CN202735279 U CN 202735279U
- Authority
- CN
- China
- Prior art keywords
- absorption coefficient
- heat absorption
- sensor
- harmonic
- wire
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Landscapes
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
The utility model provides a surface-mounted sensor and a heat absorption coefficient measuring device. The surface-mounted sensor comprises a block-shaped base body, a metal wire-shaped sensor, two leading wire pieces and a protective film layer, wherein the block-shaped base body is used as a supporting article; the metal wire-shaped sensor is formed on the top surface of the block-shaped base body; one side of the metal wire-shaped sensor far away from the block-shaped base body is propped against a sample; the leading wire pieces are formed on the block-shaped base body and respectively connected with two ends of the metal wire-shaped sensor; leading wire ends are arranged at the tail ends of the leading wire pieces; and the protective film layer is formed on the top surface of the double-spiral metal wire-shaped sensor. According to the utility model, through a handheld mode, testing can be achieved by directly closing the surface-mounted sensor to a solid sample to be detected.
Description
Technical field
The utility model relates to the field of measuring technique of the industries such as electronics, building, material, relates in particular to a kind of surface stuck type sensor and heat absorption coefficient measurement mechanism.
Background technology
Heat absorption coefficient is defined as the square root of thermal conductivity, specific heat capacity and three parameter products of density, the ability of its reflection material and surrounding environment heat exchange.Heat absorption coefficient had both comprised the concept (because wherein containing thermal capacitance) of heat storage capacity, can embody to a certain extent again object to get towards periphery/concept of the speed of heat release.Therefore, a key parameter of evaluating material thermal storage effect in the heat absorption coefficient Chang Zuowei accumulator system.
As far back as at the end of last century, the 3 ω measuring techniques that just have the scholar to propose to use based on Harmonic Detection characterize heat absorption coefficient.The method that realizes roughly is that then this planar metal sensor tries to achieve the heat absorption coefficient parameter of detected materials simultaneously as well heater and temperature sensor according to the relation of heat wave frequency and temperature variation at detected materials surface preparation rail shape planar metal sensor.Analyzing the method is not difficult to find, the method can not realize the Non-Destructive Testing of solid sample, and need to repeat single sample is carried out the preparation of dielectric film (when measuring conductive solid) and rail shape planar metal sensor, so implementing process is complicated, cost price is also higher.
In order to solve an above-mentioned difficult problem, the synoptic diagram when Figure 1A is prior art heat absorption coefficient measurement mechanism measurement solid sample the heat absorption coefficient measurement mechanism based on independent sensor appearred again afterwards.Figure 1B is the synoptic diagram of prior art heat absorption coefficient measurement mechanism when measuring liquid/powdered sample.Shown in Figure 1A, the heat absorption coefficient measurement mechanism is divided into independent sensor 1 and sample storage tank 3, and wherein, independent sensor 1 comprises: planar shaped metal sensor 11, flexible coverlay 12, flexible substrate 13; Sample storage tank 3 comprises: ladle bowl 31, cover 32,331 to 334 and four lead riser 33a to 33d of four lead wire lever.Four lead ends of independent sensor 1 are electrically connected with lead wire lever 331～334 the inners of sample storage tank 3 upper ends successively, lead riser 33a～the 33d of sample storage tank 3 lead wire lever 331～334 outer ends is connected with follow-up metering circuit 6 through wire, thereby finishes the measurement of heat absorption coefficient.
Shown in Figure 1A, when above-mentioned heat absorption coefficient measurement mechanism is measured the heat absorption coefficient of solid sample, two same sample that need the cutting certain size, and need to clamp " sandwich style " structure that is consisted of by sample and independent sensor with the sample fixed station, two current feed bars 331,334 by wire access independent sensor two outer leg ends with faint cycle sinusoidal current to 11 electrical heating of planar shaped metal sensor, fundamental voltage between two inner lead ends of planar shaped metal sensor 11 and third harmonic voltage signal are by two voltage lead bars 332,333 enter harmonic measurement unit 6 records and output, thereby finish measurement.This has certain size with regard to requiring at the sample of independent sensor both sides configuration, and this is just so that the method can't be used for the scene use in the fields such as building, space flight, detection.
As shown in Figure 1B, when above-mentioned heat absorption coefficient measurement mechanism is measured liquid/powdered sample, also need be equipped with constant temperature and pressure chamber 4 and temperature and pressure regulon 5.Constant temperature and pressure chamber 4 comprises: metal shell 41, heat-insulation layer 42 and inner chamber 43; Temperature and pressure regulating system 5 comprises: thermopair 51, TEC heating/cooling device 52, temperature controller 53, pressure transducer 54, gas handling system 55 and pressure controller 56.During test, liquid/powdered sample 2 is filled in the sample storage tank 3; Independent sensor 1 vertically is positioned over 2 li of liquid/powdered samples; Sample storage tank 3 is placed in the constant temperature and pressure chamber inner chamber 4, and place on the bottom surface of inner chamber, four lead ends of independent sensor 1 connect the lead wire lever 331～334 that arranges with sample storage tank 3 upper ends successively and are connected, and the lead riser 33a～33d of outer end still is connected with follow-up metering circuit 6 through wire; After finishing whole connection procedure, start-up temperature and pressure regulating unit 5 after temperature and pressure arrives setting value, get final product the heat absorption coefficient of specimen.And the mode of connection and heating, measuring method are identical during with the described measurement solid of Figure 1A.As seen, in to liquid/powdered sample measuring process, independent sensor 1 vertically is positioned over 2 li of liquid/powdered samples, and this operating feature can't realize the adjusting of sample rate, therefore also just can not be used for analyzing the heat absorption coefficient of liquid/powdered sample with the relation of variable density.
The utility model content
The technical matters that (one) will solve
For solving above-mentioned one or more problems, the utility model provides a kind of surface stuck type sensor and heat absorption coefficient measurement mechanism.
(2) technical scheme
According to an aspect of the present utility model, a kind of surface stuck type sensor is provided, comprising: block matrix, as stilt; The wire-shaped sensor is formed on the end face of described block matrix, and its side away from described block matrix is connected on the sample; Two lead-in wire parts are formed on the described block matrix, and the two ends with described wire-shaped sensor are connected respectively, and its end arranges lead end; And the protection film layer, be formed at the end face of described Double-spiral wire-shaped sensor.
Preferably, in the utility model surface stuck type sensor, described wire-shaped sensor is Double-spiral or snakelike.
Preferably, in the utility model surface stuck type sensor, described wire-shaped sensor is Double-spiral, and described double helical diameter is in 10～50mm scope; Described Double-spiral wire-shaped sensor thickness is in 10～100 mu m ranges, and the single metal wire width is within 50～500 mu m ranges, and the tinsel total length is in 100～600mm scope.
According to another aspect of the present utility model, a kind of heat absorption coefficient measurement mechanism that comprises above-mentioned surface stuck type sensor also is provided, also comprise: be connected with surface stuck type sensor two lead ends, for the surface stuck type sensor provides the cycle sinusoidal current that sample is heated, and measure simultaneously the fundamental voltage at surface stuck type sensor two ends and the harmonic measurement unit of third harmonic voltage; And be connected with harmonic measurement unit, utilize the heat absorption coefficient of block matrix, fundamental voltage and the third harmonic voltage at surface stuck type sensor two ends, calculate the computing unit of sample heat absorption coefficient.
Preferably, in the utility model heat absorption coefficient measurement mechanism, described harmonic measurement unit comprises: its first current feed end and the second current feed end are electrically connected with two lead ends of surface stuck type sensor respectively, for providing the heating current of faint cycle sinusoidal signal, SMD sensor provides part, its the first detecting voltage lead end and the second detecting voltage lead end also are electrically connected with two lead ends of surface stuck type sensor respectively, measure the fundamental voltage of wire-shaped sensor and the signal measurement part of third harmonic voltage.
Preferably, in the utility model heat absorption coefficient measurement mechanism, described heating current provides part to comprise successively: signal generator; The first operational amplifier, its input end is connected with the output terminal of signal generator; And the 9th resistance, the one end is connected to described the first operational amplifier, and the other end is connected to described surface stuck type sensor.
Preferably, in the utility model heat absorption coefficient measurement mechanism, described the 9th resistance is adjustable resistance, its resistance R9=α * R
m, R wherein
mBe the resistance of wire-shaped sensor 11, α=0.95～1.05.
Preferably, in the utility model heat absorption coefficient measurement mechanism, described signal measurement partly comprises: its first input end and the second input end are connected to respectively the two ends of the 9th resistance, the voltage signal at the 9th resistance two ends are converted to the second operational amplifier of the first differential wave; Its first input end and the second input end are connected to respectively the two ends of Double-spiral wire-shaped sensor, the voltage signal at Double-spiral wire-shaped sensor two ends are converted to the 3rd operational amplifier of the second differential wave; Its two ends are connected to respectively the output terminal of the second operational amplifier and the 3rd operational amplifier, and following two signals are exported in timesharing: the four-operational amplifier of the difference of the first differential wave, the first differential wave and the second differential wave; Its second input end is connected to the output terminal of four-operational amplifier, calculates fundamental voltage, and this fundamental voltage is the effective value of the first harmonic of the first differential wave; Also calculate third harmonic voltage, this third harmonic voltage is the lock-in amplifier of effective value of third-harmonic component of the difference of the first differential wave and the second differential wave; Its input end is connected to the output terminal of lock-in amplifier, microcomputer control and data acquisition system (DAS) that the effective value of the effective value of the first harmonic of lock-in amplifier output and third-harmonic component is carried out data acquisition.
Preferably, the utility model heat absorption coefficient measurement mechanism also comprises: sampling receptacle, be fixed in the top of surface stuck type sensor.
Preferably, in the utility model heat absorption coefficient measurement mechanism, described sampling receptacle comprises: vessel shell, and banding is integrally formed structure in the block matrix side of described surface stuck type sensor; Container cover is connected by clearance fit with the inwall of described vessel shell, and this container cover can be freely up and down at the inwall of vessel shell; Ballast is arranged on the described container cover.
(3) beneficial effect
Can find out that from technique scheme surface stuck type sensor and heat absorption coefficient measurement mechanism that the utility model is used for the heat absorption coefficient measurement have following beneficial effect:
(1) in the utility model, the built-in block matrix of surface stuck type sensor can be used as the sample of stilt and the heating of Double-spiral wire-shaped sensor one side, thereby can directly the surface stuck type sensor be adjacent to solid sample to be measured by hand-held tests, no longer sample size there is requirement, also do not need to carry special sample fixed part, these characteristics solve at present to a great extent need to carry out cutting based on 3 ω measuring techniques of Harmonic Detection to solid sample to be measured when the specimen heat absorption coefficient and reach certain size, the problem that can not be used for the on-the-spot test etc. of material;
(2) in the utility model, the powder/liquid sample is filled in the sampling receptacle with active type sample lid that is arranged in surface stuck type sensor top, therefore these characteristics can further measure the heat absorption coefficient of powdered sample and the relation of density so that but the density of powder/liquid sample is adjustable and quantification (density value can be read in real time by the scale of container wall).
Description of drawings
Synoptic diagram when Figure 1A is prior art heat absorption coefficient measurement mechanism measurement solid sample;
Figure 1B is the synoptic diagram of prior art heat absorption coefficient measurement mechanism when measuring liquid/powdered sample;
Fig. 2 A is the vertical view of the utility model embodiment surface stuck type sensor;
Fig. 2 B is that surface stuck type sensor shown in Fig. 2 A is along the cut-open view of A-A face;
Fig. 3 is the structural representation of harmonic measurement unit in the utility model embodiment heat absorption coefficient measurement mechanism;
Fig. 4 is for adopting the utility model embodiment heat absorption coefficient measurement mechanism to measure the synoptic diagram of solid sample heat absorption coefficient;
Fig. 5 is the structural representation of sampling receptacle in the utility model embodiment heat absorption coefficient measurement mechanism.
[main element symbol description]
1-surface stuck type sensor; The 2-testing sample;
The 3-sampling receptacle; The 4-counterweight;
The 5-harmonic measurement unit.
Wherein, surface stuck type sensor 1 comprises:
11-Double-spiral wire-shaped sensor; 121～122-part that goes between;
12a～12b-lead end; The block matrix of 13-;
14-protection film layer.
Sampling receptacle 3 comprises:
31-vessel shell (band scale); The 32-container cover.
51-the first operational amplifier; 52-the second operational amplifier;
53-the 3rd operational amplifier; The 54-prime amplifier;
The 55-signal generator; The 56-lock-in amplifier;
The control of 57-microcomputer and data acquisition system (DAS); R1-the first Low Drift Temperature resistance;
R2-the second Low Drift Temperature resistance; R3-the 3rd Low Drift Temperature resistance;
R4-the 4th Low Drift Temperature resistance; R5-the 5th Low Drift Temperature resistance;
R6-the 6th Low Drift Temperature resistance; R7-the 7th Low Drift Temperature resistance;
R8-the 8th Low Drift Temperature resistance; R9-the 9th resistance;
5a-the first current feed end; 5b-the first detecting voltage lead end;
5c-the second detecting voltage lead end; 5d-the second current feed end.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, the utility model is further described.
Need to prove that in accompanying drawing or instructions description, similar or identical part is all used identical figure number.And in the accompanying drawings, to simplify or convenient the sign.Moreover the implementation that does not illustrate in the accompanying drawing or describe is form known to a person of ordinary skill in the art in the affiliated technical field.In addition, although this paper can provide the demonstration of the parameter that comprises particular value, should be appreciated that parameter need not definitely to equal corresponding value, but can in acceptable error margin or design constraint, be similar to corresponding value.
In an exemplary embodiment of the present utility model, provide a kind of surface stuck type sensor.Fig. 2 A is the vertical view of the utility model embodiment surface stuck type sensor.Fig. 2 B is that surface stuck type sensor shown in Fig. 2 A is along the cut-open view of A-A face.Shown in Fig. 2 A and 2B, surface stuck type sensor 1 comprises: block matrix 13, and as stilt, its heat absorption coefficient is known; Wire-shaped sensor 11 is formed on the end face of block matrix 13, and its side away from block matrix 13 is connected on the sample, for testing sample being heated and feeding back fundamental voltage and third harmonic voltages to harmonic measurement unit 5; Two lead-in wire parts (121,122) are formed on the described block matrix 13, and the two ends with described wire-shaped sensor 11 are connected respectively, and its end arranges lead end (12a, 12b); Protection film layer 14 is insulating heat-conduction material, is formed at the end face of described Double-spiral wire-shaped sensor 11, is used for the heat that described Double-spiral wire-shaped sensor 11 produces is conducted to sample.
Shown in Fig. 2 A, wire-shaped sensor 11 is Double-spiral.These Double-spiral wire-shaped sensor 11 thickness are in 10～100 mu m ranges, and its single conductive wire width is in 50～500 mu m ranges, and the diameter of double helix is in 10～50mm scope, and the tinsel total length is in 100～600mm scope.Double-spiral wire-shaped sensor 11 and two lead-in wire parts 121～122 are attached on the block matrix 13 by photoetching or gas-phase deposition by conducting metal.Described conducting metal is platinum, gold or nickel.In addition, wire-shaped sensor 11 can also be snakelike or other shapes.Two lead end 12a～12b spacings are in 5～40mm scope.
Shown in Fig. 2 B, block matrix 13 surfaces through polish, polishing, its bottom surface at Double-spiral wire-shaped sensor 11 and two lead-in wire parts 121～122 forms stilt.In the utility model, the material of block matrix 13 can be quartz glass, can also be the smooth surface such as mica fine and close, insulate, have certain durothermic material.Wherein, the length of side of block matrix 13 is in 20～100mm scope, and thickness is in 10～100mm scope.
Shown in Fig. 2 B, the insulating protective layer with certain physical strength that protection film layer 14 forms for the end face at Double-spiral wire-shaped sensor 11 and two lead-in wire parts 121～122.The thickness of protection film layer 14 is in 1～10 mu m range, and it is to be attached on the block matrix 13 by physics or chemical vapor deposition method.This protection film layer 14 is high heat conduction membraneous material, such as diamond like carbon film or cubic boron nitride film.
In another exemplary embodiment of the present utility model, also provide a kind of heat absorption coefficient measurement mechanism.This measurement mechanism comprises: aforesaid surface stuck type sensor 1, and the block matrix that the built-in heat absorption coefficient of one side is known, opposite side is connected to the sample surface, is used for sample is heated; Harmonic measurement unit 5 is connected with surface stuck type sensor 1, is used to surface stuck type sensor 1 that the cycle sinusoidal current that sample is heated is provided, and adopts simultaneously Harmonic Method to measure fundamental voltage and the third harmonic voltage at surface stuck type sensor 1 two ends; And computing unit, be connected with described harmonic measurement unit 5, be used for utilizing the heat absorption coefficient of described block matrix, fundamental voltage and the third harmonic voltage at surface stuck type sensor 1 two ends, calculate the heat absorption coefficient of sample.
Below respectively each ingredient except the surface stuck type sensor in the utility model heat absorption coefficient measurement mechanism is elaborated.
Fig. 3 is the structural representation of harmonic measurement unit in the utility model embodiment heat absorption coefficient measurement mechanism.As shown in Figure 3, harmonic measurement unit 5 comprises:
Heating current provides part, its first current feed end 5a and the second current feed end 5d respectively with two lead end (12a of surface stuck type sensor 1,12b) be electrically connected, be used to SMD sensor that faint cycle sinusoidal signal is provided, comprise: signal generator 55, the first operational amplifier 51 and the 9th resistance R 9, wherein, the first output terminal output angle frequency of signal generator 55 is the ac voltage signal of ω; This ac voltage signal is converted to current signal through the first operational amplifier 51, and this current signal drives the Double-spiral wire-shaped sensor 11 of the 9th resistance R 9 and the 1 interior encapsulation of surface stuck type sensor successively.
The signal measurement part, its first detecting voltage lead end 5b and the second detecting voltage lead end 5c also respectively with two lead end (12a of surface stuck type sensor 1,12b) be electrically connected, be used for measuring fundamental voltage and the third harmonic voltage of wire-shaped sensor 11, comprise: the second operational amplifier 52, the 3rd operational amplifier 53, four-operational amplifier 54, lock-in amplifier 56 and microcomputer control and data acquisition system (DAS) 57, wherein:
The second operational amplifier 52, its first input end and the second input end are connected to respectively the two ends of the 9th resistance R 9, are used for the voltage signal at the 9th resistance R 9 two ends is converted to the first differential wave;
The 3rd operational amplifier 53, its first input end and the second input end are connected to respectively the two ends of Double-spiral wire-shaped sensor 11, are used for the voltage signal at Double-spiral wire-shaped sensor 11 two ends is converted to the second differential wave;
Four-operational amplifier 54, its two ends are connected to respectively the output terminal of the second operational amplifier 52 and the 3rd operational amplifier 53, are used for timesharing and export following two signals: the first differential wave, the first differential wave and the second differential wave poor;
Lock-in amplifier 56, its second input end is connected to the output terminal of four-operational amplifier 54, is used for: calculate fundamental voltage, this fundamental voltage is the effective value of the first harmonic of the first differential wave; Calculate third harmonic voltage, this third harmonic voltage is the effective value of third-harmonic component of the difference of the first differential wave and the second differential wave;
Microcomputer control and data acquisition system (DAS) 57, its input end is connected to the output terminal of lock-in amplifier 56, carries out data acquisition for the effective value of the first harmonic that lock-in amplifier 56 is exported and the effective value of third-harmonic component.
Because actual what record is the faint temperature rise (directly being calculated by first-harmonic and third harmonic) of wire-shaped sensor 11, so must use Low Drift Temperature resistance in the circuit, guarantees thermometric accuracy.As shown in Figure 3, the first input end of the second operational amplifier 52 and the second input end are connected to respectively the two ends of the 9th resistance R 9 by the first Low Drift Temperature resistance R 1 and the second Low Drift Temperature resistance R 2, and first input end is connected to ground by the 3rd Low Drift Temperature resistance R 3, and the second input end is connected to its output terminal by the 4th Low Drift Temperature R4.The first input end of the 3rd operational amplifier 53 and the second input end are connected to respectively the two ends of wire-shaped sensor 11 by the 5th Low Drift Temperature resistance R 5 and the 6th Low Drift Temperature resistance R 6, and first input end is connected to ground by the 7th Low Drift Temperature resistance R 7, and the second input end is connected to its output terminal by the 8th Low Drift Temperature R8.
Wherein, the 9th resistance R 9 is adjustable resistance, and its resistance is near the resistance of wire-shaped sensor 11, wherein, and R9=α * R
m, R wherein
mBe the resistance of wire-shaped sensor 11, α=0.95～1.05.The first Low Drift Temperature resistance R 1, the second Low Drift Temperature resistance R 2, the 3rd Low Drift Temperature resistance R 3, the 4th Low Drift Temperature resistance R 4, the 5th Low Drift Temperature resistance R 5, the 6th Low Drift Temperature resistance R 6, the 7th Low Drift Temperature resistance R 7, the 8th Low Drift Temperature resistance R 8 are that the resistance temperature coefficient only is the Low Drift Temperature resistance of 2ppm/ ℃ of type.
In addition, the first input end of lock-in amplifier 56 is connected to the second output terminal of signal generator 55, is used for by differential Input Monitor Connector, so that the bridge balance that is comprised of each element of measure portion.
In the present embodiment, computing unit, be used for to utilize following formula by the heat absorption coefficient of known block matrix 13 and fundamental voltage, third harmonic voltage, the heat absorption coefficient of calculating testing sample:
Wherein, X
1The heat absorption coefficient of-testing sample, its unit is J m
-2K
-1s
-0.5
X
2The heat absorption coefficient of-known block matrix, its unit is J m
-2K
-1s
-0.5
α
CRThe used metallic resistance temperature coefficient of-wire-shaped sensor, its unit is K
-1
U
1 ωThe effective value of-fundamental voltage, its unit are V;
U
3 ω, 1-frequency f
1The effective value of the third harmonic voltage that records down, wherein third harmonic voltage is near 1/100000～1/1000 fundamental voltage, and its unit is V;
U
3 ω, 2-frequency f
2The third harmonic voltage that records down, its unit are V;
f
1The AC signal frequency that-signal generator arranges for the first time, its unit is Hz;
f
2The AC signal frequency that-signal generator arranges for the second time, its unit is Hz;
R
0The room temperature resistance value of-wire-shaped sensor, its unit are Ω;
The double-stranded equivalent area of S-, its unit is m
2
The t-coefficient, generally speaking, its value generally gets 7.09 between 6.5 to 7.5.
Fig. 4 is for adopting the utility model embodiment heat absorption coefficient measurement mechanism to measure the synoptic diagram of solid sample heat absorption coefficient.Directly be close to testing sample 2 by hand-held when as shown in Figure 4, surface stuck type sensor 1 is measured solid sample.
In another preferred embodiment of the utility model, also provide a kind of device for liquid/powdered sample heat absorption coefficient measurement.In the present embodiment, this device also comprises: sampling receptacle 3, be fixed in the top of surface stuck type sensor 1, and be used for contain fluid or powdered sample.
Fig. 5 is the structural representation of sampling receptacle in the utility model embodiment heat absorption coefficient measurement mechanism.As shown in Figure 5, this sampling receptacle 3 comprises: a vessel shell 31, container cover 32 and a ballast, wherein: vessel shell 31 banding when measuring liquid/powdered sample 2 is integrally formed structure in block matrix 13 sides of surface stuck type sensor 1, and testing liquid/powdered sample 2 is filled in the vessel shell 31 and with protection film layer 14 and directly contacts; Container cover 32 is connected by clearance fit with the inwall of vessel shell 31, and container cover 32 can be freely up and down at the inwall of vessel shell 31; Ballast is arranged on the container cover 32, for the height by block matrix 13 end faces of adjusting container cover 32 distances, thus the density of regulating testing liquid/powder sample 2, density value is obtained by the scale value conversion of mark on the vessel shell 31.
Generally speaking, please refer to Fig. 3 a and illustrate, described ballast is that a series of several quality are 1g, 2g, 5g, the standard test weight combination (4) of 10g and 20g; With tweezers folders or wear the gloves counterweight 4 of taking and evenly be placed on the container cover 32, it is stressed evenly to be convenient to regulate testing liquid/powdered sample 2 and surface stuck type sensor 1.Described counterweight 4 adopts austenitic stainless steel counterweight or aldary counterweight.
The below describes the measuring principle of the heat absorption coefficient measurement mechanism of above-mentioned two embodiment.Pass into the cycle weak current that angular frequency is ω for Double-spiral wire-shaped sensor 11, the effective value of Double-spiral wire-shaped sensor 11 internal currents is very little, the heat of only tens milliwatts that produce because of Joule effect will be with the frequency of 2 ω to Double-spiral wire-shaped sensor 11, block matrix 13, protection film layer 14 and testing sample 2 heating, the temperature rise of Double-spiral wire-shaped sensor 11 must be less than 0.5K, the frequency range of the periodic current that adopts simultaneously is larger, several Hz change to hundreds of Hz from zero point, produce thus the different temperature wave of frequency, the resistance that causes Double-spiral wire-shaped sensor 11 increases, and the resistance that Double-spiral wire-shaped sensor 11 increases and angular frequency to be the periodic current acting in conjunction of ω produce the different voltage harmonic of frequency.Because the thickness of the protection film layer 14 on Double-spiral wire-shaped sensor 11 surfaces very little (only being in 1～10 mu m range), and coefficient of heat conductivity is very large, so protection film layer 14 can be ignored fully on the impact of the temperature rise of Double-spiral wire-shaped sensor 11.As long as guarantee that heat wave has penetrated protection film layer 14 in measured frequency range, just can determine according to the relation of voltage harmonic and vibration frequency the heat storage performance parameter information of testing sample 2.The heat absorption coefficient parameter of can nondestructive measurement solid-state, the liquid and Powdered energy storage material of the theoretical model that utilization the utility model proposes and data processing method is particularly useful for on-the-spot direct control.And, carrying out liquid/powder sample heat absorption coefficient when measuring, can also reach by changing its volume the purpose of variable density.
Based on above-mentioned heat absorption coefficient measurement mechanism and principle, this paper also provides a kind of heat absorption coefficient measuring method.With reference to Fig. 4, the method concrete steps are as follows:
Step S101 calibrates the heat absorption coefficient of block matrix 13, and this step is divided into again:
Step S101a, by hand-held surface stuck type sensor 1 directly is close to the known standard of heat absorption coefficient 304 stainless steel block samples (surface that contacts with surface stuck type sensor 1 is through polishing, polishing), guarantee that as far as possible surface of contact is smooth, without obvious drift angle, gap;
Step S101b, two lead end 12a, 12b of surface stuck type sensor 1 are electrically connected ( lead end 5a and 5b are welded in 12a, and lead end 5c and 5d are welded in 12b) with two detecting voltage lead end 5b, 5c and two current feed end 5a, 5d of harmonic measurement unit 5 respectively;
Step S101c, measure two fundamental voltage and the third harmonic voltages that go between between the parts 121,122 that the Double-spiral wire-shaped sensor 11 in the surface stuck type sensor 1 connects with Harmonic Method, third harmonic voltage is near 1/100000～1/1000 fundamental voltage, the block matrix 13 coefficient equivalent heat absorption coefficient values built-in according to Harmonic Method test philosophy match standard 304 stainless steel blocks and surface stuck type sensor 1;
Step S101d, from the equivalent heat absorption coefficient value that last step obtains, deduct the heat absorption coefficient reference value of known standard 304 stainless steel blocks, draw the heat absorption coefficient value of block matrix material 13, the heat absorption coefficient value of the block matrix 13 that obtains is thus namely finished calibration as the known quantity in the experiment of next testing testing sample;
Step S101e, surface stuck type sensor 1 is removed from standard model, draw a small amount of ethanolic solution with dropper, dropping is at the searching surface (being the protection film layer 14 of end face) of surface stuck type sensor 1, the impurity such as the sample bits of suitable cleaning searching surface, dust, after the ethanolic solution on surface to be detected evaporates fully, beginning step S102.
Step S102 is if testing sample still is solid, then still to hand method with surface stuck type sensor 1 abundant contact measured sample;
Step S103 is electrically connected two lead end 12a, 12b of surface stuck type sensor 1 respectively with two detecting voltage lead end 5b, 5c and two current feed end 5a, 5d of harmonic measurement unit 5;
Step S104, the maximum resistance that the 9th resistance R 9 of adjusting series connection approaches or slightly may reach greater than Double-spiral wire-shaped sensor 11 in the measuring process, in order to prevent that Double-spiral wire-shaped sensor 11 from having apparent in view temperature rise, the output voltage of conditioning signal generator 55, so that the voltage at the 9th resistance R 9 two ends is near 10mV, finely tune the 9th resistance R 9, differential Input Monitor Connector by lock-in amplifier 56, so that the bridge balance that is comprised of each element of measure portion, the resistance of the 9th resistance R 9 just equals the cold-state resistance of Double-spiral wire-shaped sensor 11;
Step S105, two current feed end 5a, the 5d of harmonic measurement unit 5 is with faint cycle sinusoidal current heating Double-spiral wire-shaped sensor 11;
Step S106 selects a series of frequency values, measures fundamental voltage and the third harmonic voltage at Double-spiral wire-shaped sensor 11 two ends under the respective frequencies value.During the third harmonic at measurement Double-spiral wire-shaped sensor 11 two ends under a certain frequency, should select rational fundamental voltage, so that the third harmonic at Double-spiral wire-shaped sensor 11 two ends, calculates the equivalent heat absorption coefficient value of block matrix 13 and the testing sample 2 of surface stuck type sensor 1 thus near 1/100000～1/1000 of first-harmonic;
Step S107 deducts the block matrix heat absorption coefficient value that is obtained by step 101 calibration by above-mentioned equivalent heat absorption coefficient, obtains the heat absorption coefficient value of testing sample, namely finishes the test to testing sample.
If testing sample is liquid/powder, need to adjust the density of sample, with reference to Fig. 5, concrete steps comprise:
S102 ' a is integrally formed structure with vessel shell 31 bandings in block matrix 13 sides of surface stuck type sensor 1;
S102 ' b is filled in testing liquid/powdered sample in the vessel shell 31 and with protection film layer 14 and directly contacts, and makes the surfacing of testing sample;
S102 ' c places container cover 32 on the testing sample, and the certain counterweight 4 of quality of choosing some is evenly arranged on the container cover 32;
S102 ' d, quantity and the weight classes of adjusting counterweight guarantee that the density of testing liquid/powder sample reaches setting value, density value is obtained by the scale conversion of mark on the vessel shell 31;
In addition, reaching sample in container cover 32 sets in the process of position of density value, also can stop (can read in real time density value this moment by the scale of container wall) in a plurality of positions of setting density value that are higher than, then measure fundamental voltage and the third harmonic voltage at Double-spiral wire-shaped sensor 11 two ends with said method, again according to Harmonic Method test philosophy match testing sample 2 and block matrix 13 coefficient equivalent heat absorption coefficient values, then deduct the heat absorption coefficient value of calibrating the block matrix 13 that obtains, namely obtain the heat absorption coefficient value of testing sample 2; Therefore utilize this experimental system can further measure the relation of powdered sample heat absorption coefficient and density.
The heat absorption coefficient scope of the material of the utility model test is wider, and the solid heat absorption coefficient is at 100～10000Js
-0.5M
-2K
-1Between, the uncertainty of measurement of heat absorption coefficient is less than ± 6.5%, and liquid/powder heat absorption coefficient is at 100～2000Js
-0.5M
-2K
-1Between, the uncertainty of measurement of heat absorption coefficient is less than ± 7.4%.
Need to prove that above-mentioned definition to each element is not limited in various concrete structures or the shape of mentioning in the embodiment, those of ordinary skill in the art can replace simply to it with knowing.
Above-described specific embodiment; the purpose of this utility model, technical scheme and beneficial effect are further described; institute is understood that; the above only is specific embodiment of the utility model; be not limited to the utility model; all within spirit of the present utility model and principle, any modification of making, be equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.
Claims (10)
1. a surface stuck type sensor is characterized in that, comprising:
Block matrix is as stilt;
The wire-shaped sensor is formed on the end face of described block matrix, and its side away from described block matrix is connected on the sample;
Two lead-in wire parts are formed on the described block matrix, and the two ends with described wire-shaped sensor are connected respectively, and its end arranges lead end; And
The protection film layer is formed at the end face of described Double-spiral wire-shaped sensor.
2. surface stuck type sensor according to claim 1, wherein, described wire-shaped sensor is Double-spiral or snakelike.
3. surface stuck type sensor according to claim 2, wherein, described wire-shaped sensor is Double-spiral, described double helical diameter is in 10～50mm scope;
Described Double-spiral wire-shaped sensor thickness is in 10～100 mu m ranges, and the single metal wire width is within 50～500 mu m ranges, and the tinsel total length is in 100～600mm scope.
4. a heat absorption coefficient measurement mechanism that comprises each described surface stuck type sensor in the claims 1 to 3 is characterized in that, also comprises:
Be connected with described surface stuck type sensor two lead ends, for described surface stuck type sensor provides the cycle sinusoidal current that sample is heated, and measure simultaneously the fundamental voltage at described surface stuck type sensor two ends and the harmonic measurement unit of third harmonic voltage; And
Be connected with described harmonic measurement unit, utilize the heat absorption coefficient of described block matrix, fundamental voltage and the third harmonic voltage at surface stuck type sensor two ends, calculate the computing unit of sample heat absorption coefficient.
5. heat absorption coefficient measurement mechanism according to claim 4, wherein, described harmonic measurement unit comprises:
Its first current feed end and the second current feed end are electrically connected with two lead ends of surface stuck type sensor respectively, provide part for SMD sensor provides the heating current of faint cycle sinusoidal signal,
Its first detecting voltage lead end and the second detecting voltage lead end also are electrically connected with two lead ends of surface stuck type sensor respectively, measure the fundamental voltage of wire-shaped sensor and the signal measurement part of third harmonic voltage.
6. heat absorption coefficient measurement mechanism according to claim 5, wherein, described heating current provides part to comprise successively:
Signal generator;
The first operational amplifier, its input end is connected with the output terminal of signal generator; And
The 9th resistance, one end are connected to described the first operational amplifier, and the other end is connected to described surface stuck type sensor.
7. heat absorption coefficient measurement mechanism according to claim 5, wherein, described the 9th resistance is adjustable resistance, its resistance R9=α * R
m, R wherein
mBe the resistance of wire-shaped sensor, α=0.95～1.05.
8. heat absorption coefficient measurement mechanism according to claim 6, wherein, described signal measurement partly comprises:
Its first input end and the second input end are connected to respectively the two ends of the 9th resistance, the voltage signal at the 9th resistance two ends are converted to the second operational amplifier of the first differential wave;
Its first input end and the second input end are connected to respectively the two ends of Double-spiral wire-shaped sensor, the voltage signal at Double-spiral wire-shaped sensor two ends are converted to the 3rd operational amplifier of the second differential wave;
Its two ends are connected to respectively the output terminal of the second operational amplifier and the 3rd operational amplifier, and following two signals are exported in timesharing: the four-operational amplifier of the difference of the first differential wave, the first differential wave and the second differential wave;
Its second input end is connected to the output terminal of four-operational amplifier, calculates fundamental voltage, and this fundamental voltage is the effective value of the first harmonic of the first differential wave; Also calculate third harmonic voltage, this third harmonic voltage is the lock-in amplifier of effective value of third-harmonic component of the difference of the first differential wave and the second differential wave;
Its input end is connected to the output terminal of lock-in amplifier, microcomputer control and data acquisition system (DAS) that the effective value of the effective value of the first harmonic of lock-in amplifier output and third-harmonic component is carried out data acquisition.
9. heat absorption coefficient measurement mechanism according to claim 4 also comprises: sampling receptacle, be fixed in the top of surface stuck type sensor.
10. heat absorption coefficient measurement mechanism according to claim 9, wherein, described sampling receptacle comprises:
Vessel shell, banding is integrally formed structure in the block matrix side of described surface stuck type sensor;
Container cover is connected by clearance fit with the inwall of described vessel shell, and this container cover can be freely up and down at the inwall of vessel shell;
Ballast is arranged on the described container cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220360421 CN202735279U (en) | 2012-07-24 | 2012-07-24 | Surface-mounted sensor and heat absorption coefficient measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220360421 CN202735279U (en) | 2012-07-24 | 2012-07-24 | Surface-mounted sensor and heat absorption coefficient measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202735279U true CN202735279U (en) | 2013-02-13 |
Family
ID=47660965
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220360421 Expired - Lifetime CN202735279U (en) | 2012-07-24 | 2012-07-24 | Surface-mounted sensor and heat absorption coefficient measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202735279U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103852485A (en) * | 2014-03-05 | 2014-06-11 | 中国科学院工程热物理研究所 | Device for testing thermophysical parameters of material by double-helix plane structure harmonic wave method |
| CN105738408A (en) * | 2016-01-29 | 2016-07-06 | 青岛理工大学 | Method for rapidly measuring heat conductivity coefficient of semiconductor film |
| CN107702821A (en) * | 2017-10-16 | 2018-02-16 | 山东省科学院海洋仪器仪表研究所 | A kind of diamond thin abyssal temperature sensor and preparation method thereof |
| CN108051476A (en) * | 2017-12-07 | 2018-05-18 | 中国科学院工程热物理研究所 | 3 ω thermal physical property measuring devices of self and method based on sapphire substrates |
-
2012
- 2012-07-24 CN CN 201220360421 patent/CN202735279U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103852485A (en) * | 2014-03-05 | 2014-06-11 | 中国科学院工程热物理研究所 | Device for testing thermophysical parameters of material by double-helix plane structure harmonic wave method |
| CN103852485B (en) * | 2014-03-05 | 2016-06-01 | 中国科学院工程热物理研究所 | The device of double spiral plane structure harmonic wave method test material thermal physical property parameter |
| CN105738408A (en) * | 2016-01-29 | 2016-07-06 | 青岛理工大学 | Method for rapidly measuring heat conductivity coefficient of semiconductor film |
| CN107702821A (en) * | 2017-10-16 | 2018-02-16 | 山东省科学院海洋仪器仪表研究所 | A kind of diamond thin abyssal temperature sensor and preparation method thereof |
| CN108051476A (en) * | 2017-12-07 | 2018-05-18 | 中国科学院工程热物理研究所 | 3 ω thermal physical property measuring devices of self and method based on sapphire substrates |
| CN108051476B (en) * | 2017-12-07 | 2020-08-04 | 中国科学院工程热物理研究所 | Independent type 3 omega thermophysical property measuring device and method based on sapphire substrate |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202735279U (en) | Surface-mounted sensor and heat absorption coefficient measuring device | |
| US5711604A (en) | Method for measuring the coefficient of heat conductivity of a sample | |
| CN102313758B (en) | Device and method for measuring heat storage coefficient of material by harmonic method based on independent sensor | |
| CN103293184B (en) | Experimental device for testing heat conductivity coefficient of building material based on quasi steady state and unsteady state methods | |
| CN101782541A (en) | Method and device for testing thermal physical property of solid material with independent probe by using harmonic method | |
| CN102997974A (en) | Adaptive capacitance liquid level meter | |
| CN103698357B (en) | A kind of thermal conductivity based on MEMS double-heater and thermal diffusion coefficient sensor | |
| CN105190297B (en) | Hypersensitive ratio capacitance dilatometer and associated method | |
| CN101464422A (en) | Thermal conductivity coefficient measurement instrument for solid material | |
| CN207832953U (en) | A kind of test device of oil for electric power industrial frequency withstand voltage | |
| CN103149233B (en) | The device and method of test material thermal physical property parameter | |
| CN102135573B (en) | Device and method for measuring dielectric constant of low-loss medium | |
| CN201535761U (en) | Harmonic method solid material thermal physical property test device with independent probe | |
| CN102749353B (en) | Measurement device and measurement method of veneer-type sensor for measuring heat absorption coefficient | |
| CN201041558Y (en) | Device for detecting liquid heat conduction coefficient and thermal diffusion rate based on harmonic wave detection technology | |
| CN203178220U (en) | Device for testing thermophysical parameter of material | |
| JP3047141B2 (en) | Parallel plate dielectric constant measuring device | |
| CN202057621U (en) | Device for measuring heat storage coefficients of materials with harmonic wave method based on independent sensor | |
| CN107621477A (en) | A kind of Harmonic Method hydrogel testing device for measuring thermal conductivity and method | |
| CN103852485B (en) | The device of double spiral plane structure harmonic wave method test material thermal physical property parameter | |
| CN105891264A (en) | Rapid nondestructive detecting method and device for cocoon layer water content and dried cocoon shell weight of fresh cocoons | |
| CN203732477U (en) | Device for testing thermophysical properties of material with harmonic method by adopting double-helix plane structure | |
| Arai et al. | Construction of a 3He calorimeter and heat capacity measurement of the 1965 calorimetry conference copper standard between 0.4 and 20K. | |
| CN108051476B (en) | Independent type 3 omega thermophysical property measuring device and method based on sapphire substrate | |
| Guenz et al. | Concept of a new technique for the combined determination of dielectric and density virial coefficients3 |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130213 |
|
| CX01 | Expiry of patent term |