阅读说明：本技术 一种原子层热电堆热流传感器的封装结构及封装工艺 (Packaging structure and packaging process of atomic layer thermopile heat flow sensor ) 是由 杨凯 朱涛 王雄 朱新新 王辉 杨庆涛 于 2019-12-13 设计创作，主要内容包括：本发明公开了一种原子层热电堆热流传感器的封装结构及封装工艺，其封装结构包括：基座；封装套，其与基座之间为紧密配合；敏感元件，其固定于基座上，且其外表面与封装套上端面齐平；引线孔Ⅰ，其位于基座中，且设置在基座上端；敏感元件的结构包括：钛酸锶晶片，其上开设有引线孔Ⅱ，引线孔Ⅱ位于引线孔Ⅰ正上方；热电效应薄膜，其沉积在钛酸锶晶片上；导电金膜，其沉积在钛酸锶晶片上，且位于热电效应薄膜两端；导线槽，其开设在基座中；银导线，其固定在导线槽中，且银导线穿过引线孔Ⅰ和引线孔Ⅱ，本发明提供的热流传感器封装结构及封装工艺避免了大深径比的细小孔加工难度，实现了导线的有效固定。(The invention discloses a packaging structure and a packaging process of an atomic layer thermopile heat flow sensor, wherein the packaging structure comprises the following components: a base; the packaging sleeve is tightly matched with the base; the sensitive element is fixed on the base, and the outer surface of the sensitive element is flush with the upper end surface of the packaging sleeve; the lead wire hole I is positioned in the base and is arranged at the upper end of the base; the structure of the sensitive element comprises: the strontium titanate wafer is provided with a lead hole II, and the lead hole II is positioned right above the lead hole I; a thermoelectric effect thin film deposited on the strontium titanate wafer; the conductive gold film is deposited on the strontium titanate wafer and is positioned at two ends of the thermoelectric effect film; a wire guide groove opened in the base; the silver wire is fixed in the wire groove and penetrates through the lead hole I and the lead hole II.)

1. A packaging structure of an atomic layer thermopile heat flow sensor, comprising:

a base;

the packaging sleeve is tightly matched with the base; the sensitive element is fixed on the base, and the outer surface of the sensitive element is flush with the upper end surface of the packaging sleeve; a lead hole I provided in the base;

the structure of the sensitive element comprises: the strontium titanate wafer is provided with a lead hole II, and the lead hole II is coincided with the central axis of the lead hole I; a thermoelectric effect thin film deposited on the strontium titanate wafer; the conductive gold film is deposited on the strontium titanate wafer, covers the surface of the strontium titanate wafer on the periphery of the lead hole II and is positioned at two ends of the thermoelectric effect film;

the wire guide groove is formed in the base, and the wire leading hole I is positioned between the sensitive element and the wire guide groove; and the silver wire is fixed in the wire groove, penetrates through the lead hole I and the lead hole II and is electrically communicated with the conductive gold film.

2. The package structure of atomic layer thermopile heat flow sensor according to claim 1, wherein the package sleeve is one of polyetheretherketone, aluminum nitride ceramic, silicon nitride ceramic, and alumina ceramic; the base is an aluminum alloy base with an anodized surface.

3. The package structure of an atomic layer thermopile heat flow sensor of claim 1, wherein the thermoelectric effect film is one of a yttrium barium copper oxide film, a lanthanum manganese copper oxide film, etc. with a lateral seebeck effect.

4. The atomic layer thermopile heat flow sensor package structure of claim 1, wherein the lead slot and the silver lead are respectively provided in two, and the lead slot is filled with glue, and the silver lead is fixed in the base by the glue.

5. The package structure of atomic layer thermopile heat flow sensor according to claim 1, wherein a conductive adhesive is coated between the silver wire and the conductive gold film for realizing electrical conduction between the silver wire and the conductive gold film.

6. The package structure of atomic layer thermopile heat flow sensor according to claim 1, wherein the silver wire end face is flush with the sensing element outer surface.

7. The package structure of atomic layer thermopile heat flow sensor according to claim 1, wherein the strontium titanate wafer has a diameter of 6mm or less and a thickness of 0.5mm or less; the diameters of the lead hole I and the lead hole II are 0.2 mm.

8. A packaging structure of an atomic layer thermopile heat flow sensor according to any of the claims 1-7, wherein the packaging process comprises the following steps:

step one, carrying out anode surface treatment on an aluminum alloy base; forming a strontium titanate wafer by using a mechanical processing or femtosecond laser processing means, forming two lead holes II with the diameter of 0.2mm at the central symmetrical designated positions of the strontium titanate wafer, processing the surface of the strontium titanate wafer by using an ion polishing process, and depositing an yttrium barium copper oxide film and a conductive gold film on the strontium titanate wafer by using a physical vapor deposition method to form a sensitive element of the atomic layer thermopile heat flow sensor;

fixing the sensitive element on the aluminum alloy base in a glue bonding mode, and ensuring that the lead hole II is coincident and aligned with the lead hole I in the aluminum alloy base;

thirdly, enabling the silver wire to penetrate through the lead hole I and the lead hole II, pouring glue into the wire groove, fixing the silver wire in the aluminum alloy base, ensuring that the silver wire is completely sunk into the wire groove, and simultaneously enabling the end face of the silver wire to be flush with the outer surface of the sensitive element;

coating conductive silver adhesive between the silver wire and the conductive gold film for realizing the electric conduction between the silver wire and the conductive gold film;

sleeving the polyether-ether-ketone packaging sleeve on the aluminum alloy base, ensuring that the polyether-ether-ketone packaging sleeve is tightly matched with the aluminum alloy base, and enabling the upper end face of the polyether-ether-ketone packaging sleeve to be flush with the outer surface of the sensitive element; the polyether-ether-ketone packaging sleeve is used for further protecting the sensitive element and electrically insulating the sensitive element from a test model in the use process of the atomic layer thermopile heat flow sensor; therefore, the packaging structure of the atomic layer thermopile heat flow sensor is packaged and finished.

Technical Field

The invention belongs to the technical field of heat flow sensors, and particularly relates to a packaging structure and a packaging process of an atomic layer thermopile heat flow sensor.

Background

The transition of the boundary layer is one of a few basic scientific problems left by the classic mechanics, and is called a 'century problem' together with the turbulence problem. For hypersonic flight, after the hypersonic boundary layer is changed from laminar flow to turbulent flow, the wall surface heat flow and the friction force are both increased sharply. Therefore, theoretical and experimental research on transition of the hypersonic velocity boundary layer is an important means for recognizing the transition mechanism to further control transition. By combining the cognition of the current hypersonic speed boundary layer transition theory research, the evolution and the development of the incoming flow disturbance are considered as the core of the boundary layer transition mechanism. Accordingly, there is also increasing interest in wind tunnel experimental research, such as testing and analysis of high frequency pulsating heat flow. At present, the high-frequency pulsating heat flow at home and abroad is mainly tested by utilizing an atomic layer thermopile heat flow sensor, and the sensor is not available at home. On the basis of obtaining a Sensor sensitive element by referring to the heat measurement principle of a foreign atomic layer thermopile heat flow Sensor (Tim Roediger and the like of Germany University of Stuttgart, published as an article entitled "Time-resolved heat transfer measurements on the tip wall of a bipolar channel usage a novel heat flux Sensor-Part I: Sensor and benchmark), a Sensor packaging structure and a packaging process are designed, thereby avoiding the processing difficulty of small holes with large depth-diameter ratio and realizing the effective fixation of leads. Therefore, the atomic layer thermopile heat flow sensor which can be used in shock tunnel and conventional hypersonic wind tunnel tests is formed.

Disclosure of Invention

An object of the present invention is to solve at least the above problems and/or disadvantages and to provide at least the advantages described hereinafter.

To achieve these objects and other advantages in accordance with the purpose of the invention, there is provided a package structure of an atomic layer thermopile heat flow sensor, comprising:

a base;

the packaging sleeve is tightly matched with the base; the sensitive element is fixed on the base, and the outer surface of the sensitive element is flush with the upper end surface of the packaging sleeve; a lead hole I provided in the base;

the structure of the sensitive element comprises: the strontium titanate wafer is provided with a lead hole II, and the lead hole II is coincided with the central axis of the lead hole I; a thermoelectric effect thin film deposited on the strontium titanate wafer; the conductive gold film is deposited on the strontium titanate wafer, covers the surface of the strontium titanate wafer on the periphery of the lead hole II and is positioned at two ends of the thermoelectric effect film;

the wire guide groove is formed in the base, and the wire leading hole I is positioned between the sensitive element and the wire guide groove; and the silver wire is fixed in the wire groove, penetrates through the lead hole I and the lead hole II and is electrically communicated with the conductive gold film.

Preferably, the packaging sleeve is one of insulating packaging sleeves such as a polyether-ether-ketone packaging sleeve, an aluminum nitride ceramic packaging sleeve, a silicon nitride ceramic packaging sleeve and an alumina ceramic packaging sleeve; the base is an aluminum alloy base with an anodized surface.

Preferably, the thermoelectric effect film is one of yttrium barium copper oxide films, lanthanum manganese copper oxide films and the like having a transverse seebeck effect.

Preferably, the wire groove and the silver wire are respectively provided in two, glue is poured into the wire groove, and the silver wire is fixed in the base through the glue.

Preferably, a conductive adhesive is coated between the silver wire and the conductive gold film for realizing the electrical conduction between the silver wire and the conductive gold film.

Preferably, the end face of the silver wire is flush with the outer surface of the sensitive element.

Preferably, the strontium titanate wafer has a diameter of 6mm or less and a thickness of 0.5mm or less; the diameters of the lead hole I and the lead hole II are 0.2 mm.

A packaging structure of an atomic layer thermopile heat flow sensor comprises the following steps:

step one, carrying out anode surface treatment on an aluminum alloy base; forming a strontium titanate wafer by using a mechanical processing or femtosecond laser processing means, forming two lead holes II with the diameter of 0.2mm at the central symmetrical designated positions of the strontium titanate wafer, processing the surface of the strontium titanate wafer by using an ion polishing process, and depositing an yttrium barium copper oxide film and a conductive gold film on the strontium titanate wafer by using a physical vapor deposition method to form a sensitive element of the atomic layer thermopile heat flow sensor;

fixing the sensitive element on the aluminum alloy base in a glue bonding mode, and ensuring that the lead hole II is coincident and aligned with the lead hole I in the aluminum alloy base;

thirdly, enabling the silver wire to penetrate through the lead hole I and the lead hole II, pouring glue into the wire groove, fixing the silver wire in the aluminum alloy base, ensuring that the silver wire is completely sunk into the wire groove, and simultaneously enabling the end face of the silver wire to be flush with the outer surface of the sensitive element;

coating conductive silver adhesive between the silver wire and the conductive gold film for realizing the electric conduction between the silver wire and the conductive gold film;

sleeving the polyether-ether-ketone packaging sleeve on the aluminum alloy base, ensuring that the polyether-ether-ketone packaging sleeve is tightly matched with the aluminum alloy base, and enabling the upper end face of the polyether-ether-ketone packaging sleeve to be flush with the outer surface of the sensitive element; the polyether-ether-ketone packaging sleeve is used for further protecting the sensitive element and electrically insulating the sensitive element from a test model in the use process of the atomic layer thermopile heat flow sensor; therefore, the packaging structure of the atomic layer thermopile heat flow sensor is packaged and finished.

The invention at least comprises the following beneficial effects: the packaging structure of the atomic layer thermopile heat flow sensor provided by the invention avoids the processing difficulty of small holes with large depth-diameter ratio, effectively realizes the fixation of a sensor sensitive element, and achieves the purposes of test signal extraction and electric insulation; and the packaging process of the packaging structure is simple, the operability is strong, and the packaging structure is convenient to realize.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Description of the drawings:

FIG. 1 is a schematic diagram of a package structure of an atomic layer thermopile thermal flow sensor provided in the present invention;

fig. 2 is a schematic structural diagram of a sensing element of a packaging structure of an atomic layer thermopile heat flow sensor provided by the present invention.

The specific implementation mode is as follows:

the present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.

It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.

As shown in fig. 1-2: the invention relates to a packaging structure of an atomic layer thermopile heat flow sensor, which comprises:

a base 3;

the packaging sleeve 2 is tightly matched with the base 3; the sensitive element 1 is fixed on the base 3, and the outer surface of the sensitive element is flush with the upper end face of the packaging sleeve 2; a lead hole i 6 provided in the base 3;

the structure of the sensitive element comprises: the strontium titanate wafer 7 is provided with a lead hole II 10, and the lead hole II 10 is superposed with the central axis of the lead hole I6; a thermoelectric effect thin film 9 deposited on the strontium titanate wafer 7; conductive gold films 8 which are deposited on the strontium titanate wafer 7, cover the surface of the strontium titanate wafer around the lead hole II 10 and are positioned at two ends of the thermoelectric effect film 9;

the lead slot 5 is formed in the base 3, and the lead hole I6 is positioned between the sensitive element 1 and the lead slot 5; and the silver wire 4 is fixed in the wire groove 5, passes through the lead holes I and II and is electrically communicated with the conductive gold film 8.

The working principle is as follows: the packaging structure of the atomic layer thermopile heat flow sensor is used for leading out electric signals directly related to high-frequency heat flow test from a shock wave wind tunnel and a conventional hypersonic speed wind tunnel; the silver wire 4 is communicated with the conductive gold film 8 of the sensitive element 1, and a test signal obtained by sensing of the sensitive element 1 is led out from a shock wave wind tunnel and a conventional supersonic wind tunnel, so that high-frequency pulsating heat flow can be directly obtained; the base 3 provides a fixing mechanism for the sensitive element, and plays a role in fixing, supporting and protecting the sensitive element 1; the packaging sleeve further forms protection for the sensitive element, and achieves the purpose of electric insulation with the experimental model in the using process of the sensor. Under the condition that temperature gradients exist on the upper surface and the lower surface of the thermoelectric effect film 9, a thermoelectric potential which is transverse and vertical to the temperature gradient direction of the upper surface and the lower surface of the thermoelectric effect film 9 is generated due to the transverse Seebeck effect; the obtained atomic layer thermopile heat flow sensor needs to be subjected to static calibration to obtain the sensitivity coefficient of the atomic layer thermopile heat flow sensor, and dynamic response time parameters of the atomic layer thermopile heat flow sensor can be calibrated by using pulse type experimental equipment such as a shock tube.

In the above technical scheme, the package cover 2 is one of insulating package covers such as a polyetheretherketone package cover, an aluminum nitride ceramic package cover, a silicon nitride ceramic package cover, an alumina ceramic package cover, etc.; the base is an aluminum alloy base with an anodized surface.

In the above technical solution, the thermoelectric effect film 9 is one of yttrium barium copper oxide films, lanthanum manganese copper oxide films, and the like having a transverse seebeck effect.

In the above technical solution, the wire groove 5 and the silver wire 4 are respectively provided with two, glue is poured into the wire groove 5, and the silver wire 4 is fixed in the base 3 through the glue.

In the above technical solution, a conductive adhesive is coated between the silver wire 4 and the conductive gold film 8 for realizing the electrical conduction between the silver wire 4 and the conductive gold film 8.

In the technical scheme, the end face of the silver wire 4 is flush with the outer surface of the sensitive element 1.

In the technical scheme, the diameter of the strontium titanate wafer 7 is less than or equal to 6mm, and the thickness of the strontium titanate wafer is less than or equal to 0.5 mm; the diameters of the lead hole I and the lead hole II are 0.2 mm.

In the above technical solution, the packaging process of the atomic layer thermopile heat flow sensor packaging structure includes the following steps:

step one, carrying out anode surface treatment on an aluminum alloy base; forming a strontium titanate wafer by using a mechanical processing or femtosecond laser processing means, forming two lead holes II with the diameter of 0.2mm at the central symmetrical designated positions of the strontium titanate wafer, processing the surface of the strontium titanate wafer by using an ion polishing process, and depositing an yttrium barium copper oxide film and a conductive gold film on the strontium titanate wafer by using a physical vapor deposition method to form a sensitive element of the atomic layer thermopile heat flow sensor;

fixing the sensitive element 1 on the aluminum alloy base 3 in a glue bonding mode, and ensuring that a lead hole II 10 is superposed and aligned with a lead hole I6 in the aluminum alloy base 3;

thirdly, the silver wire 4 penetrates through the lead hole I10 and the lead hole II 6, glue is poured into the wire groove 5, the silver wire 4 is fixed in the aluminum alloy base 3, the silver wire 4 is guaranteed to be completely sunk into the wire groove 5, and meanwhile the end face of the silver wire 4 is flush with the outer surface of the sensitive element 1;

coating conductive silver adhesive between the silver wire 4 and the conductive gold film 8 for realizing the electric conduction between the silver wire 4 and the conductive gold film 8;

sleeving the polyether-ether-ketone packaging sleeve 2 on the aluminum alloy base 3, ensuring that the polyether-ether-ketone packaging sleeve 2 is tightly matched with the aluminum alloy base 3, and enabling the upper end face of the polyether-ether-ketone packaging sleeve 2 to be flush with the outer surface of the sensitive element 1; the polyether-ether-ketone packaging sleeve 2 is used for further protecting the sensitive element 1 and electrically insulating the sensitive element from a test model in the use process of the atomic layer thermopile heat flow sensor; therefore, the packaging structure of the atomic layer thermopile heat flow sensor is packaged and finished.

The number of apparatuses and the scale of the process described herein are intended to simplify the description of the present invention. Applications, modifications and variations of the present invention will be apparent to those skilled in the art.

While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.