CN219284495U

CN219284495U - Light and small refrigeration type infrared imaging device

Info

Publication number: CN219284495U
Application number: CN202320635279.5U
Authority: CN
Inventors: 袁辉; 冶竣峰; 孙德新; 刘银年; 顾姗姗; 孙虎; 吴伟
Original assignee: Nantong Academy of Intelligent Sensing
Current assignee: Nantong Academy of Intelligent Sensing
Priority date: 2023-03-28
Filing date: 2023-03-28
Publication date: 2023-06-30
Anticipated expiration: 2033-03-28

Abstract

The utility model provides a light and small refrigeration type infrared imaging device, which comprises an infrared imaging system and a two-dimensional holder, wherein the infrared imaging system comprises a box body with a containing space, a detector assembly, an infrared imaging lens and a Stirling refrigerator assembly, firstly, the infrared optical system carries out refrigeration on the whole optical system through the Stirling refrigerator assembly to reduce the working temperature and reduce the background photon flux, the function of a background limit detector is effectively exerted, the detection sensitivity of an instrument is improved, and secondly, the infrared optical system is small in size and compact in structure. The Stirling refrigerator component is in direct contact with the lens clamp through the refrigerator cold head to conduct cold, and then is transmitted to the infrared imaging lens through the lens clamp. The corrugated pipe of the detector can not only isolate the local box body temperature of the lens, but also eliminate stray light for the detector. The multiple groups of direct-current mute fans are beneficial to radiating in the box body, so that the efficiency and the service life of the detector and the Stirling refrigerator are improved.

Description

Light and small refrigeration type infrared imaging device

Technical Field

The utility model belongs to the technical field of infrared imaging, and particularly relates to a light and small refrigeration type infrared imaging device.

Background

The infrared detector is a photosensitive device capable of converting invisible infrared radiation into measurable physical quantity, and has wide application in the fields of military, weather, industry, environmental science, medical diagnosis and the like. And the improvement of the signal-to-noise ratio and the detection sensitivity of the medium-wave and long-wave thermal infrared system is always a key point of thermal infrared research and technology improvement. The detectability of the target signal has been limited by noise effects of dark current noise, circuit readout noise, optical system background radiation, etc., which have a relatively large specific gravity.

Under the condition of space low temperature background, background radiation influencing the detection rate of the instrument is often mainly the heat radiation of an optical system of the instrument and the components of the instrument in the field of view. Reducing their temperature can reduce background photon flux, effectively act as background limit detector, and raise detection sensitivity of instrument. Therefore, to realize high-sensitivity and low-noise observation, the infrared equipment needs to be subjected to refrigeration treatment, and firstly, dark current noise of the infrared detector is suppressed through refrigerating an infrared focal plane; secondly, the optical system is refrigerated by a luminescence technology, so that the thermal background radiation perceived by the detector is reduced.

Disclosure of Invention

In order to solve the problems, the utility model provides a light and small refrigeration type infrared imaging device which improves the detection sensitivity of an instrument and meets the requirements of light and small photoelectric imaging load, and the specific contents of the utility model are as follows:

the utility model aims to provide a light and small refrigeration type infrared imaging device which comprises an infrared imaging system and a two-dimensional cradle head, wherein the infrared imaging system is fixedly arranged on the two-dimensional cradle head; the infrared imaging lens is fixedly arranged in the accommodating space and comprises a detector assembly, an infrared imaging lens and a Stirling refrigerator assembly from near to far, the infrared imaging lens is fixedly arranged in the accommodating space of the box body through a lens mounting seat, the infrared imaging lens and the optical window are on the same light path, the detector assembly receives light information entering the infrared imaging lens, and the Stirling refrigerator assembly refrigerates the detector assembly through a refrigerator cold head.

In order to better realize the technical scheme, the periphery of the outer wall of the box body in the light and small refrigeration type infrared imaging device is covered with a skin component, and the top of the box body is fixed with a sunshade.

In order to better realize the technical scheme, the detector assembly in the light and small refrigeration type infrared imaging device comprises a detector fixing guide seat fixed in the box accommodating space, an L-shaped detector mounting seat fixed on the detector fixing guide seat, a refrigeration type long wave detector which is in wrap fit with the L-shaped detector mounting seat through a Dewar connector and a detector corrugated pipe nested between the detector fixing guide seat and the detector mounting seat, wherein the refrigeration type long wave detector corresponds to the infrared imaging lens so as to image infrared light passing through the infrared imaging lens.

In order to better realize the technical scheme, the detector fixing guide seat and the box body in the light and small refrigeration type infrared imaging device are sealed by an O-shaped sealing ring.

In order to better realize the technical scheme, the Stirling refrigerator component in the light and small refrigeration type infrared imaging device is directly contacted with the lens clamp through the refrigerator cold head to conduct cold, and then is transmitted to the infrared imaging lens through the lens clamp.

In order to better realize the technical scheme, the other side of the infrared imaging system in the light and small refrigeration type infrared imaging device is provided with a plurality of groups of direct current mute fans through fixing, and is provided with an aviation plug.

Compared with the prior art, the light and small refrigeration type infrared imaging device has the beneficial effects that:

1. the light and small refrigeration type infrared imaging device comprises an infrared imaging system and a two-dimensional cradle head, wherein the infrared imaging system comprises a box body with a containing space, a detector assembly, an infrared imaging lens and a Stirling refrigerator assembly, firstly, the infrared optical system refrigerates the whole optical system through the Stirling refrigerator assembly to reduce the working temperature and reduce the background photon flux, the function of a background limit detector is effectively exerted, the detection sensitivity of the instrument is improved, and secondly, the infrared optical system is small in size and compact in structure.

2. In the light and small refrigeration type infrared imaging device, the Stirling refrigerator component is directly contacted with the lens clamp through the refrigerator cold head to conduct cold, and then is transmitted to the infrared imaging lens through the lens clamp.

3. The detector bellows in the light and small refrigeration type infrared imaging device can not only isolate the local box body temperature of the lens, but also eliminate stray light for the detector.

4. The light and small refrigerating infrared imaging device provided by the utility model has the advantages that the plurality of groups of direct current mute fans are beneficial to heat dissipation in the box body, so that the efficiency and the service life of the detector and the Stirling refrigerator are improved.

Drawings

FIG. 1 is a schematic diagram of an infrared imaging optical system according to an embodiment;

FIG. 2 is a schematic diagram of a refrigerating infrared camera of an infrared imaging optical system according to an embodiment;

fig. 3 is an isometric view of an infrared imaging internal structure in an embodiment.

FIG. 4 is a side view of an infrared imaging internal structure in one embodiment;

FIG. 5 is a cross-sectional view of an infrared imaging internal structure in one embodiment;

fig. 6 is a partial cross-sectional view of a structural portion of an infrared imaging lens in an embodiment. Drawings

1-an infrared imaging system; 2-a two-dimensional cradle head; 11-sunshade; 12-a skin assembly; 13-a cold box upper cover plate; 14-an optical window; 15-a box body; 16-a dc silent fan assembly; 17-stirling cooler assembly; 18-refrigerating type long wave detector; 19-aviation plug; 110-an infrared imaging lens; 111-a lens mount; 112-a detector bellows; 113-a detector mount; 114-a detector fixing guide seat; 115-lens clamp.

Description of the embodiments

The following description of the preferred embodiments of the present utility model refers to the accompanying drawings, which make the technical contents thereof more clear and easy to understand. The present utility model may be embodied in many different forms of embodiments and the scope of the present utility model is not limited to only the embodiments described herein.

In the drawings, like structural elements are referred to by like reference numerals and components having similar structure or function are referred to by like reference numerals. The dimensions and thickness of each component shown in the drawings are arbitrarily shown, and the present utility model is not limited to the dimensions and thickness of each component. The thickness of the components is exaggerated in some places in the drawings for clarity of illustration.

The light and small refrigeration type infrared imaging device comprises an infrared imaging system 1 and a two-dimensional cradle head 2, wherein the infrared imaging system 1 is fixedly arranged on the two-dimensional cradle head 2, the infrared imaging system 1 comprises a box body 15 with a containing space, and one side of the box body 15 is provided with an optical window 14; the optical window 14 is fixedly arranged in the accommodating space and is far from near to far and comprises a detector assembly, an infrared imaging lens 110 and a Stirling refrigerator assembly 17, the infrared imaging lens 110 is fixedly arranged in the accommodating space of the box body 15 through a lens mounting seat 111, the infrared imaging lens 110 and the optical window 14 are on the same optical path, the detector assembly receives light information entering the infrared imaging lens 110, and the Stirling refrigerator assembly 17 refrigerates the detector assembly through a refrigerator cold head.

Further, in the light and small refrigeration type infrared imaging device, the outer periphery of the outer wall of the box body 15 is covered with the skin assembly 12, and the sunshade 11 is fixed on the top of the box body 15.

Further, the detector assembly in the light and small refrigeration type infrared imaging device of the utility model comprises a detector fixing guide seat 114 fixed in the accommodating space of the box body 15, an L-shaped detector mounting seat 113 fixed on the detector fixing guide seat 114, a refrigeration type long wave detector 18 which is wrapped and matched with the L-shaped detector mounting seat 113 through a Dewar connector, and a detector corrugated pipe 112 nested between the detector fixing guide seat 114 and the detector mounting seat 113, wherein the detector corrugated pipe 112 can separate the local box body temperature of a lens and eliminate stray light for the detector, and the refrigeration type long wave detector 18 corresponds to the infrared imaging lens 110 so as to image infrared light which passes through the infrared imaging lens 110.

Further, in the light and small refrigeration type infrared imaging device of the utility model, the detector fixing guide seat 114 and the box body 15 are sealed by an O-shaped sealing ring.

Further, the Stirling refrigerator assembly 17 in the light and small refrigeration type infrared imaging device of the utility model is directly contacted with the lens clamp 115 through the refrigerator cold head for cold conduction, and then is transmitted to the infrared imaging lens 110 through the lens clamp 115.

Furthermore, the other side of the infrared imaging system 1 in the light and small refrigeration type infrared imaging device is provided with the aviation plug 19 by fixing a plurality of groups of direct current mute fans 16, and the plurality of groups of direct current mute fans 16 are beneficial to heat dissipation in the box body, so that the efficiency and the service life of the detector and the Stirling refrigerator are improved.

The foregoing describes in detail preferred embodiments of the present utility model. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the utility model without requiring creative effort by one of ordinary skill in the art. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.

Claims

1. The light and small refrigeration type infrared imaging device comprises an infrared imaging system (1) and a two-dimensional holder (2), wherein the infrared imaging system (1) is fixedly arranged on the two-dimensional holder (2), and is characterized in that the infrared imaging system (1) comprises a box body (15) with a containing space, and an optical window (14) is formed in one side of the box body (15); the fixed setting is in the accommodation space is from near to far including detector subassembly, infrared imaging lens (110) and Stirling refrigerator subassembly (17), infrared imaging lens (110) are in through lens mount pad (111) fixed mounting in box (15) accommodation space, infrared imaging lens (110) with optical window (14) are in same light path, the detector subassembly receives get into the optical information of infrared imaging lens (110), stirling refrigerator subassembly (17) are through cold head of a cooler to the detector subassembly is refrigerated.

2. A light and small refrigeration type infrared imaging device according to claim 1, wherein the outer wall periphery of the box body (15) is covered with a skin assembly (12), and a sunshade (11) is fixed on the top of the box body (15).

3. The light and small refrigeration type infrared imaging device according to claim 1, wherein the detector assembly comprises a detector fixing guide seat (114) fixed in the accommodating space of the box body (15), an L-shaped detector mounting seat (113) fixed on the detector fixing guide seat (114), a refrigeration type long wave detector (18) matched with the L-shaped detector mounting seat (113) through a Dewar joint in a wrapping mode, and a detector corrugated pipe (112) nested between the detector fixing guide seat (114) and the detector mounting seat (113), wherein the refrigeration type long wave detector (18) corresponds to the infrared imaging lens (110) so as to image infrared light penetrating through the infrared imaging lens (110).

4. A light and small refrigeration type infrared imaging device according to claim 3, wherein the detector fixing guide seat (114) and the box body (15) are sealed by an O-ring.

5. A light and small refrigeration type infrared imaging device according to claim 1, wherein the stirling cooler assembly (17) is directly contacted with the lens holder (115) for cooling by a cooler cold head and then transferred to the infrared imaging lens (110) by the lens holder (115).

6. A light and compact refrigerated infrared imaging device according to claim 1, characterized in that the other side of the infrared imaging system (1) is equipped with aviation plugs (19) by means of a fixed plurality of sets of dc mute fans (16).