Cold plate and detector capable of improving abnormal shaking of refrigeration infrared detector imaging picture

Abstract

The application belongs to the technical field of refrigeration type infrared detector, and particularly relates to a cold disc structure capable of improving imaging quality of a refrigeration type infrared detector. A buffer part is arranged on the cold disc to buffer shock waves generated by back-and-forth reciprocating movement of a refrigeration cylinder cold accumulator, so that the impact strength of the cold accumulator on the cold disc is minimized, and then, shaking of a substrate and an infrared detector chip above the cold disc caused by the shock waves is avoided, refrigeration type infrared detector imaging picture fluctuation is avoided, and refrigeration type infrared detector imaging resolution is improved. In the early stage without adding parts, only optimization design is needed for the existing cold disc structure, so that the effect of obviously improving imaging picture shaking can be achieved, and the cold disc structure has a good application prospect.

Description

Technical Field

[0001] This invention relates to the field of cooled infrared detector technology, specifically to a cold plate and detector that can improve abnormal shaking of the image captured by a cooled infrared detector. Background Technology

[0002] Currently, infrared detection technology is widely used in social production and daily life. Uncooled infrared detectors are commonly used, as they can operate in environments without cryogenic cooling and are frequently seen in production and daily life. However, the non-uniformity of the infrared focal plane array in uncooled infrared detectors leads to significant errors in measurement results, resulting in lower sensitivity. When high-precision infrared detection is required for applications such as night vision equipment, panoramic search, thermal imaging observation, forward-looking early warning, weapon guidance, air defense surveillance, and infrared identification, the sensitivity of uncooled infrared detectors is insufficient. In such cases, cooled infrared detectors are needed. Cooled infrared detectors operate at lower temperatures and are equipped with cryogenic cooling devices. Compared to uncooled infrared detectors, they offer higher sensitivity and accuracy, significantly reducing errors, a wider detection temperature range, and more reliable detection results.

[0003] Conventional cooled infrared detectors also have certain problems. The main problem lies in the cooled infrared detector assembly equipped with a rotating integrated Stirling refrigerator. The refrigerator cools the Dewar cold plate by reciprocating in a high-pressure helium environment inside the Dewar cold finger cylinder through a cold accumulator. However, the cold accumulator generates shock waves during the compression of helium, which act on the cold plate and cause irregular vibration of the detector chip attached to the cold plate. This results in abnormal shaking of the image image from the detector chip, which increases the error of infrared imaging to a certain extent and reduces the accuracy of imaging.

[0004] Therefore, there is a need for a solution that can effectively reduce the vibration of the infrared detector chip above the cold plate without increasing costs, in order to solve the problems existing in the current technology. Summary of the Invention

[0005] This invention provides a cold plate and detector that can improve the abnormal shaking of the image in a cooled infrared detector. By simply optimizing the existing cold plate structure, the shaking of the image can be significantly improved, effectively reducing the error of infrared imaging and improving the accuracy of imaging.

[0006] To address the aforementioned technical problems, according to one aspect of the present invention, the present invention provides the following technical solution:

[0007] A cold plate that can improve the abnormal shaking of the image of a cooled infrared detector has a buffer part on it. The buffer part on the cold plate can buffer the shock wave generated when the cold accumulator of the refrigeration machine compresses the refrigerant, thereby reducing the impact intensity of the cold accumulator on the chip above the cold plate.

[0008] Furthermore, the buffer portion is a groove provided on the upper surface of the cold plate.

[0009] Furthermore, the groove is filled with buffer gas.

[0010] Furthermore, the interior of the groove is a vacuum; the interior space of the groove is connected to the external Dewar cavity.

[0011] Furthermore, the center of the groove is a circle, and there is a slender groove and a small hole on each side of the circle. One end of each slender groove is connected to the central groove, and the other end is connected to the small hole. The two small holes penetrate the bottom of the cold plate and are used to expel the air in the groove to create a vacuum area inside the groove.

[0012] Furthermore, the diameter of the groove is larger than the outer diameter of the cold accumulator that generates the shock wave. The depth of the groove is 0.1-0.3 mm, preferably 0.2 mm. By setting the diameter and depth of the groove to be larger than the outer diameter of the cold accumulator that generates the shock wave, the cold capacity of the cold accumulator and the impact of the shock wave are compensated and buffered to the maximum extent.

[0013] A cooled infrared detector includes a cold plate that can improve abnormal shaking of the image image of the cooled infrared detector. A substrate and an infrared detector chip are arranged sequentially on the cold plate. The cold plate is fixedly connected to the substrate, and the substrate is fixedly connected to the infrared detector chip.

[0014] Furthermore, the substrate is a ceramic substrate.

[0015] Furthermore, the cold plate is fixedly connected to the substrate by adhesive bonding, and the substrate is fixedly connected to the infrared detector chip by adhesive bonding.

[0016] By setting up a cold plate buffer, the shaking of the cooled infrared detector chip is reduced, thereby improving the quality of infrared imaging.

[0017] The advantages of this invention compared to the prior art are as follows:

[0018] This invention provides a cold plate and detector that can improve the abnormal shaking of the image image of a cooled infrared detector. A buffer part is set on the cold plate to buffer the shock wave generated by the reciprocating motion of the cooling cylinder accumulator, minimizing the impact intensity of the accumulator on the cold plate. This prevents the substrate and infrared detector chip above the cold plate from shaking due to shock waves, thus avoiding fluctuations in the image image of the cooled infrared detector and improving the imaging resolution of the cooled infrared detector. Without adding any new parts, only the existing cold plate structure needs to be optimized to achieve a significant improvement in the shaking of the image image, which has good application prospects. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the cooled infrared detector of the present invention;

[0021] Figure 2 This is a top view diagram of the cold plate structure in the existing technology;

[0022] Figure 3 This is a schematic diagram of the cross-sectional structure of a cold plate in the prior art;

[0023] Figure 4 This is a top view of the cold plate structure of the present invention;

[0024] Figure 5 This is a schematic cross-sectional view of the cold plate structure of the present invention;

[0025] Explanation of icon numbers:

[0026] 1-Refrigeration unit, 2-Cold accumulator, 3-Cold plate, 4-Substrate, 5-Infrared detector chip, 6-Buffer section, 61-Elongated groove, 62-Small hole.

[0027] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0028] The technical solutions in the embodiments will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0029] The components of the embodiments of the invention described and illustrated herein can typically be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0030] The components of the embodiments of the invention described and illustrated in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention; if the embodiments of the invention involve directional indications (such as up, down, left, right, front, back, etc.), such directional indications are only used to explain the relative positional relationships and movement of the components in a specific posture (as shown in the drawings), and if the specific posture changes, the directional indications also change accordingly.

[0031] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0032] like Figure 1-3 As shown, the cold plate in the prior art is an inverted "convex" structure. The cooled infrared detector includes a refrigerator 1, a cold accumulator 2, a cold plate 3, a substrate 4, and an infrared detector chip 5. The cooled infrared detector assembly is equipped with a rotating integrated Stirling refrigerator. The refrigerator cools the Dewar cold plate by reciprocating in a high-pressure helium environment inside the Dewar cold finger cylinder through the cold accumulator. However, the cold accumulator generates shock waves during the compression of helium, which act on the cold plate, causing irregular vibration of the detector chip attached to the cold plate, resulting in abnormal shaking of the image of the detector chip.

[0033] Example 1:

[0034] In this embodiment, as Figure 4-5As shown, this invention provides a cold plate that can improve abnormal shaking of the imaging image of a cooled infrared detector. A buffer portion 6 is provided on the cold plate 3. This buffer portion 6 buffers the shock wave generated when the accumulator 2 of the refrigerator 1 compresses the refrigerant, reducing the impact intensity of the accumulator 2 on the chip above the cold plate 3. Further, the buffer portion 6 is a groove on the upper surface of the cold plate 3. Since the positions of the accumulator 2 and the chip generally correspond to the central area of ​​the cold plate, preferably, the groove is located in the central area of ​​the cold plate. The groove separates the impact-affected area in the center of the cold plate from the chip, preventing the deformation of the cold plate caused by the impact from directly interfering with the chip, thereby buffering the impact on the chip. Furthermore, the groove is filled with buffer gas; or, the groove is a vacuum. Specifically, the cold plate 3 is generally located inside the detector Dewar. A substrate or chip is mounted on the upper surface of the cold plate, sealing the opening at the top of the groove. The internal space of the groove is connected to the external Dewar cavity, thus achieving vacuuming inside the groove while simultaneously evacuating the Dewar cavity. This is convenient to operate. By evacuating inside the groove, the cold plate can prevent the shock wave from being transmitted to the chip through the gas inside the groove, further reducing the impact intensity on the chip. Furthermore, the center of the groove is circular, with a slender groove 61 and a small hole 62 on each side of the circle. One end of each slender groove 61 connects to the central groove, and the other end connects to the small hole 62. The two small holes 62 penetrate the bottom of the cold plate 3 and connect to the Dewar cavity, thus allowing air to be discharged from the groove through the small holes 62 when evacuating the Dewar cavity, creating a vacuum area inside the groove. Furthermore, the groove can be any shape that can be filled with buffer gas. The middle part of the groove can also be elliptical, polygonal, or other shapes, while the leftmost and rightmost ends of the groove can also be elliptical, polygonal, or other shapes. Furthermore, the diameter of the groove is larger than the outer diameter of the cold accumulator 2 that generates the shock wave. Furthermore, the depth of the groove is 0.2 mm. Furthermore, by setting the diameter and depth of the groove to be larger than the outer diameter and depth of the cold accumulator 2 that generates the shock wave, the cooling capacity of the cold accumulator 2 and the impact of the shock wave are compensated and buffered to the maximum extent. In other embodiments, the buffer part 6 can also be a buffer block disposed on the upper surface of the cold plate 3. The buffer block can be made of a material that combines elasticity and high thermal conductivity, so as to buffer the shock wave generated by the cold accumulator without affecting the conduction of the cooling capacity of the cold plate 3.

[0035] Example 2:

[0036] In this embodiment, the present invention provides a cooled infrared detector, including a cold plate as described in Embodiment 1, which improves the abnormal shaking of the image captured by the cooled infrared detector. The cold plate is located above the cold finger inside the Dewar 3. A substrate 4 and an infrared detector chip 5 are sequentially arranged above the cold plate 3. A cold accumulator reciprocates in a high-pressure helium environment within the cold finger cylinder to cool the cold plate. The substrate 4 is a ceramic substrate. The cold plate 3 and the substrate 4 are fixedly connected by adhesive, and the substrate 4 and the infrared detector chip 5 are fixedly connected by adhesive. By providing a buffer section in the cold plate 3, the shaking of the cooled infrared detector chip 5 is reduced, thereby improving the infrared imaging quality.

[0037] Example 3:

[0038] In this embodiment, the present invention provides a cooled infrared detector, including a cold plate that can improve abnormal shaking of the image of the cooled infrared detector. The cold plate 3 includes a buffer portion 6 disposed on the cold plate 3. A substrate 4 and an infrared detector chip 5 are sequentially disposed above the cold plate. The cold plate 3 is fixedly connected to the substrate 4, and the substrate 4 is fixedly connected to the infrared detector chip 5. The buffer portion 6 on the cold plate 3 buffers the shock waves generated by the reciprocating motion of the accumulator 2 of the cooling cylinder of the cooling machine 1, reducing the impact intensity of the accumulator 2 on the cold plate 3. Further, the buffer portion is a sealed groove, the outer edge of which is larger than the outer edge of the accumulator. The groove can be filled with a buffer material, or a portion of a buffer liquid, or a portion of a buffer solid, or a mixture of any two or three of gaseous, liquid, and solid buffer materials. The mixing method can be to directly mix different states of buffer materials or to use a layered buffering method to minimize the shaking of the infrared detector chip. Furthermore, the depth of the groove is 0.15 mm. Furthermore, the substrate 4 is a ceramic substrate. Furthermore, the cold plate 3 and the substrate 4 are fixedly connected by adhesive bonding, and the substrate 4 and the infrared detector chip 5 are fixedly connected by adhesive bonding. Furthermore, the buffer portion of the cold plate 3 reduces the shaking of the cooled infrared detector chip 5, thereby improving the infrared imaging quality.

[0039] This application utilizes a cooled infrared detector with a grooved cold plate design, which significantly improves the abnormal phenomenon of image shakiness. Without adding any new components, this application only requires optimizing the existing cold plate structure to achieve a significant improvement in image shakiness, effectively reducing infrared imaging errors and improving imaging accuracy.

[0040] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A cold plate that can improve abnormal shaking in the imaging image of a cooled infrared detector, characterized in that, A buffer section (6) is provided on the cold plate (3). The buffer section (6) on the cold plate (3) buffers the shock wave generated when the accumulator (2) of the refrigerator (1) compresses the refrigerant, thereby reducing the impact intensity of the accumulator (2) on the chip above the cold plate (3). The buffer section (6) is a groove provided on the upper surface of the cold plate (3). The inside of the groove is a vacuum, and the internal space of the groove is connected to the external Dewar cavity.

2. The cold plate according to claim 1, which can improve abnormal shaking of the imaging image of a cooled infrared detector, is characterized in that, The center of the groove is a circle, and there is a slender groove (61) and a small hole (62) on each side of the circle. One end of each slender groove (61) is connected to the central groove, and the other end is connected to the small hole (62). The two small holes (62) penetrate the bottom of the cold plate (3) and are connected to the inner cavity of the Dewar.

3. The cold plate according to any one of claims 1-2, which can improve abnormal shaking of the image of a cooled infrared detector, is characterized in that, The diameter of the groove is larger than the outer diameter of the cold accumulator (2) that generates the shock wave.

4. The cold plate according to any one of claims 1-2, which can improve abnormal shaking of the image of a cooled infrared detector, wherein the depth of the groove is 0.1-0.3 mm.

5. A cooled infrared detector, characterized in that, The invention includes a cold plate as described in any one of claims 1-4, which can improve the abnormal shaking of the image of the cooled infrared detector. A substrate (4) and an infrared detector chip (5) are arranged sequentially on the top of the cold plate (3). The cold plate (3) is fixedly connected to the substrate (4), and the substrate (4) is fixedly connected to the infrared detector chip (5).

6. The cooled infrared detector according to claim 5, characterized in that, The cold plate (3) is fixedly connected to the substrate (4) by adhesive bonding, and the substrate (4) is fixedly connected to the infrared detector chip (5) by adhesive bonding.

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