KR20140080962A

KR20140080962A - Measurement apparatus of thermal conductivity

Info

Publication number: KR20140080962A
Application number: KR1020120150198A
Authority: KR
Inventors: 김지훈; 임지혁; 함석진
Original assignee: 삼성전기주식회사
Priority date: 2012-12-21
Filing date: 2012-12-21
Publication date: 2014-07-01

Abstract

The present invention relates to a thermal conductivity measuring instrument, and more particularly, to a thermal conductivity measuring instrument capable of measuring a thermal conductivity characteristic of a composite polymer material in a non-destructive manner.
The present invention relates to a heating member for heating a point of a sample to measure a molecular thermal conductivity of the sample; A light source emitting light to measure the activated molecular structure of the heated position; A confocal diaphragm for adjusting a volume of light emitted from the light source; A beam splitter for reflecting and passing light passing through the confocal diaphragm; A condenser lens for condensing light reflected through the beam splitter to a heated position; A photodetector for detecting light reflected from the heated position of the sample; . &Lt; / RTI >

Description

{MEASUREMENT APPARATUS OF THERMAL CONDUCTIVITY}

The present invention relates to a thermal conductivity measuring instrument, and more particularly, to a thermal conductivity measuring instrument capable of measuring a thermal conductivity characteristic of a composite polymer material in a non-destructive manner.

In general, polymer composite materials are lighter in weight than conventional metal materials, resistant to corrosion, and can control thermal conductivity according to purpose, thus aiming at high integration of electronic devices and light and short life of electronic packages have.

The method of measuring the thermal conductivity is performed by raising the temperature of the measurement target using a heating source.

This method of measuring the thermal conductivity has recently been a TPS (Transient Plane Source) method for measuring the heat transfer properties of a polymer. This method is advantageous in that it is not necessary to measure the temperature of the steady state and thus it is possible to obtain the temperature change data necessary for the measurement of the thermal conductivity relatively quickly. However, there is a disadvantage that the thermal conductivity must be finally obtained through complicated thermal analysis .

In order to overcome the disadvantages described above, a laser flash method is widely used. This method is a method in which the front surface of a thin disk is heated with a short laser pulse and the temperature rise is measured at the rear side and the thermal diffusivity is also registered with the ASTME1461 standard.

However, in the above method, since the highly integrated semiconductor polymer composite material is made into a disk having a size of about 12 mm, the entire disk is regarded as a uniform material and the thermal conductivity is measured. Therefore, only the overall thermal conductivity according to the content or composition of the fillers can be measured, It is not a method.

Reference Document: Japanese Patent Laid-Open No. 2008-203235

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide an apparatus for measuring thermal conductivity of a composite polymer material in a non-destructive manner.

In order to achieve this object effectively, the present invention provides a heating apparatus comprising: a heating member for heating a point of a sample to measure a molecular thermal conductivity of the sample; A light source emitting light to measure the activated molecular structure of the heated position; A confocal diaphragm for adjusting a volume of light emitted from the light source; A beam splitter for reflecting and passing light passing through the confocal diaphragm; A condenser lens for condensing light reflected through the beam splitter to a heated position; A photodetector for detecting light reflected from the heated position of the sample; . &Lt; / RTI >

The heating member may include a laser, an optical fiber that transmits light of the laser, and a collimator that is installed at the tip of the optical fiber and condenses the light.

The heating member may further include a focusing unit installed at a tip of the collimator for focusing light at one point of the sample.

A polarizing filter may be further disposed between the confocal diaphragm and the beam splitter to transmit the polarized light of the light emitted from the light source.

A second polarizing filter may be further provided between the beam splitter and the detector.

Further, a second confocal diaphragm may be further provided between the beam splitter and the second polarizing filter.

The thermal conductivity measuring apparatus according to the embodiment of the present invention can measure the thermal conductivity characteristics of the composite polymer material in a non-destructive manner, and can accurately measure the temperature of various compositions that affect the thermal conductivity with high resolution.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram illustrating an apparatus for measuring thermal conductivity according to an embodiment of the present invention. FIG.
Fig. 2 is an exemplary operational state showing the state in which Fig. 1 is operated. Fig.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a view illustrating an apparatus for measuring thermal conductivity according to an exemplary embodiment of the present invention, and FIG. 2 is an exemplary operational diagram illustrating the operation of FIG.

The thermal conductivity measuring apparatus 100 according to the embodiment of the present invention includes a heating member 10 for heating a point of a sample S and a heating member 10 for heating a point of the sample S, A light source 20 for emitting light and a confocal diaphragm 30 for adjusting the volume of light emitted from the light source 20 and a beam splitter 50 for reflecting and passing the light of the confocal diaphragm 30, A condenser lens 60 for condensing the light reflected through the beam splitter 50 and a photodetector 90 for detecting light returning from the heated position of the sample S.

The heating member 10 includes an optical fiber 14 for transmitting the laser 12 and the laser 12 without loss and a dispersion of light transmitted through the optical fiber 14 provided at the tip of the optical fiber 14. [ And a collimator 16 that limits the intensity of the light.

More specifically, the laser 12 can use a pump laser. The pump laser 12 is used to heat the surface of the object. An optical fiber 14 is connected to the tip of the laser 12 so that light emitted from the laser 12 is not lost.

A collimator 16, which is a spectroscope, is connected to the tip of the optical fiber 14. Therefore, the light emitted from the laser 12 is transmitted through the optical fiber 14, and is not dispersed through the collimator 16, but has a linearity.

Further, a focusing unit 18 is provided at a position adjacent to the collimator 16 so as to concentrate the light to one point of the sample S.

When a certain point of the sample S is heated through the heating member 10 as described above, it is possible to detect the peak change of the molecular structure activated by the heating of the sample S on the opposite side of the sample S.

The light emitted from the laser 20 passes through the confocal diaphragm 30 and is irradiated through the polarization filter 40, the beam splitter 50 and the condenser lens 60 in the heated position of the sample S .

The laser 20 may be a probe laser. The center of the light emitted from the probe laser proceeds in exactly the same manner as the hole of the confocal diaphragm 30.

The light passing through the confocal diaphragm 30 passes through the polarizing filter 40 and passes only the polarization angle associated with the activated molecular state of the sample S.

The polarized light advances to the beam splitter 50, is reflected by the beam splitter 50, and is moved to the condenser lens 60.

The condensing lens 60 forms the focus accurately at the heated position of the sample S.

And the light reflected from the surface of the sample S is focused on the beam splitter 50 through the condenser lens 60 again.

The beam splitter 50 blocks light from the laser 20 that has not reacted with the activated molecules.

The light passing through the beam splitter 50 passes only the light that has reacted with the activated molecules while passing through the second polarizing filter 70 and passes through the center of the polarized light passing through the hole of the second confocal diaphragm 80 And then moved to the photodetector 90. [

The photodetector 90 detects the shifted light and detects a change in the peak value associated with the activated molecular arrangement.

The operation of the thermal conductivity measuring apparatus according to the embodiment of the present invention will now be described.

When light starts to be emitted from the pump laser 12 as the heating member 10, the light is transmitted through the optical fiber 14. The transmitted light is condensed through the collimator 16, which is a spectroscope, and proceeds in a state having a linearity.

In addition, the focusing unit 18 installed in front of the collimator 16 focuses the light to proceed to a state where the light is propagating in a manner to heat one point of the sample S.

When a certain point of the sample S is heated by the light emitted through the laser 12, the molecules of the composition constituting the sample S become active.

At this time, light is emitted from the laser 20 so as to detect the state of the activated molecule at the upper part of the sample (S).

The center of the light emitted from the laser 20 proceeds in a state in which it is exactly aligned with the hole of the confocal diaphragm 30. [ This is to enable precise inspection of the structure of the activated molecule at the heated position through the confocal function.

The light passing through the confocal diaphragm 30 passes through the polarization filter 40 and becomes a polarization angle. The polarized light is reflected by the beam splitter 50 and travels to the condenser lens 60.

The condensing lens 60 forms a focus so that light passing through the confocal diaphragm 30 is accurately positioned at the heating position of the sample, and irradiates the activated molecules with light.

When the polarized light-activated molecule is irradiated, it becomes basic data for obtaining the peak value of the molecular activity of the sample (S) composition. That is, the peak value is different depending on the degree of reaction of each molecule, which is data that can obtain the molecular thermal conductivity measurement value by the amount of change of the molecule compared with the molecule which is not activated.

Thereafter, when light is reflected from the molecules in response to the polarized light, the light is condensed while passing through the condenser lens 60, and passes through the beam splitter 50.

Of the light passing through the beam splitter 50, the light emitted from the light source is filtered and only the polarized light that has reacted with the molecules passes through.

The light having passed through the beam splitter 50 is transmitted to the photodetector 90 in a state where only the polarized light reacted with the molecules in the second polarizing filter 70 is passed through and aligned with the hole of the second confocal diaphragm 80 .

The photodetector 90 transmits the detected data information to the computer for display.

Accordingly, since the molecular activity due to the thermal conduction at the heating position can be measured using optical, the molecular thermal conductivity of the composition constituting the sample S can be accurately calculated.

Although the thermal conductivity measuring apparatus according to the embodiment of the present invention has been described above, the present invention is not limited thereto, and it is obvious to those skilled in the art that the application and modification are possible.

10: heating member 12: laser
14: optical fiber 16: collimator
18: focusing part 20: laser
30: confocal aperture 40: polarizing filter
50: beam splitter 60: condenser lens
70: second polarizing filter 80: second aperture stop
90: photodetector 100: measuring instrument
S: Sample

Claims

A heating member for heating a point of the sample to measure the molecular thermal conductivity of the sample;
A light source emitting light to measure the activated molecular structure of the heated position;
A confocal diaphragm for adjusting a volume of light emitted from the light source;
A beam splitter for reflecting and passing light passing through the confocal diaphragm;
A condenser lens for condensing light reflected through the beam splitter to a heated position; And
A photodetector for detecting light reflected from the heated position of the sample; A thermal conductivity measuring device.

The method according to claim 1,
Wherein the heating member includes a laser, an optical fiber for transmitting light of the laser, and a collimator provided at a tip of the optical fiber for condensing light.

3. The method of claim 2,
Wherein the heating member further comprises a focusing unit installed at a tip of the collimator for focusing light at one point of the sample.

The method according to claim 1,
And a polarizing filter for passing the polarized light of the light emitted from the light source between the confocal diaphragm and the beam splitter.

The method according to claim 1,
And a second polarizing filter is further provided between the beam splitter and the detector.

6. The method according to claim 1 or 5,
And a second confocal diaphragm is further provided between the beam splitter and the second polarizing filter.