Detector assembly and infrared device

Abstract

The utility model discloses a detector assembly which comprises a cold finger, a substrate, a first focal plane, a second focal plane, a spectroscope and a reflector. The substrate is arranged at one end of the cold finger; the first focal plane and the second focal plane are both arranged on the side, away from the cold finger, of the substrate. The spectroscope is used for dividing incident infrared light into infrared light of a first wave band and infrared light of a second wave band and making the infrared light of the first wave band enter the first focal plane. And the reflector is arranged at the downstream of the spectroscope along the transmission direction of the infrared light of the second wave band, and is used for receiving and reflecting the infrared light of the second wave band to the second focal plane. According to the detector assembly, the first focal plane and the second focal plane are both arranged on the substrate, and refrigeration is carried out through the cold finger, so that compared with an existing double-cold-finger structure, the detector assembly is additionally provided with the reflecting mirror to enable infrared light of the second wave band to enter the second focal plane on the substrate, the structure is simpler, and the size and the weight are smaller. The utility model also discloses an infrared device.

Description

Technical Field

[0001] The present application belongs to the field of infrared imaging technology, and specifically relates to a detector assembly and an infrared device. Background Art

[0002] With the development of infrared systems, due to the complexity and variability of application scenarios, single-band detector monitoring is prone to false alarms and missed alarms. In order to obtain richer remote sensing information, effectively process complex backgrounds, and improve target recognition capabilities, multi-band infrared detectors, such as dual-wave infrared detectors, are often used.

[0003] Existing dual-wave infrared detectors usually provide dual-wave infrared imaging through dual cold fingers, but the dual cold fingers have a complex structure and are large in size and weight. Utility Model Content

[0004] Based on the above technical problems, the present application provides a detector assembly and infrared device with a simple structure, small size and weight.

[0005] The technical solution proposed in this application is:

[0006] A detector assembly, comprising:

[0007] A cold finger and a substrate, wherein the substrate is disposed at one end of the cold finger;

[0008] The first focal plane and the second focal plane are both arranged on a side of the substrate away from the cold finger;

[0009] A spectroscope, used for splitting the incident infrared light into infrared light of a first wavelength band and infrared light of a second wavelength band, and allowing the infrared light of the first wavelength band to be incident on the first focal plane;

[0010] A reflector is disposed downstream of the beam splitter along a transmission direction of the infrared light in the second wavelength band, and is used for receiving and reflecting the infrared light in the second wavelength band to the second focal plane.

[0011] Furthermore, the detector assembly also includes a Dewar shell, which is provided with a window connected to its interior, the substrate, the beam splitter and the reflector are all located inside the Dewar shell, the substrate is located at one end of the cold finger close to the window, the first focal plane and the second focal plane are located on the side of the substrate facing the window, and the beam splitter is located between the first focal plane and the window.

[0012] Furthermore, the detector assembly further comprises a lens, and the lens is arranged on a side of the beam splitter away from the substrate.

[0013] Furthermore, the reflector is arranged on the inner side wall of the Dewar shell.

[0014] Further, the first focal plane and the second focal plane are spaced apart and disposed on the substrate.

[0015] Further, the second focal plane is annular, and the first focal plane is located at the middle position of the second focal plane.

[0016] Further, the detector assembly further includes a cold head, the cold head is disposed at one end of the cold finger, and the substrate is disposed on a side of the cold head away from the cold finger.

[0017] Further, both the first band and the second band are one of long wave, medium wave, and short wave, and the first band and the second band are different bands.

[0018] Further, the substrate is a ceramic plate.

[0019] An infrared device includes the detector assembly as described above.

[0020] With the above-mentioned detector assembly, the beam splitter divides the incident infrared light into infrared light of a first band and a second band, and respectively detects the infrared light of the two bands through the first focal plane and the second focal plane. Since both the first focal plane and the second focal plane are disposed on the substrate and are cooled by one cold finger, compared with the existing dual cold finger structure, the detector assembly adds a reflector to enable the infrared light of the second band to enter the second focal plane on the substrate, with a simpler structure, smaller volume and weight. Description of the Drawings

[0021] The drawings are used to provide further understanding of the present application, and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation to the present application.

[0022] Figure 1 It is a schematic structural diagram of a detector assembly provided by an embodiment of the present application;

[0023] Figure 2 is Figure 1 A schematic structural diagram of the substrate, the first focal plane, and the second focal plane in the shown detector assembly.

[0024] Label Description:

[0025] 110, cold finger; 120, substrate; 131, first focal plane; 132, second focal plane; 140, beam splitter; 150, reflector; 160, cold head; 170, Dewar housing; 171, window; 180, lens. Detailed Embodiments

[0026] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0027] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0028] On the one hand, the present application provides a detector assembly, which can realize dual-band infrared detection. Moreover, compared with the existing dual-band infrared detectors, the detector assembly has a simple structure, smaller volume and weight.

[0029] As Figure 1 and Figure 2 shown, the detector assembly includes a cold finger 110, a substrate 120, a first focal plane 131, a second focal plane 132, a beam splitter 140 and a mirror 150.

[0030] The substrate 120 is disposed at one end of the cold finger 110, and both the first focal plane 131 and the second focal plane 132 are disposed on the side of the substrate 120 away from the cold finger 110.

[0031] The beam splitter 140 is used to divide the incident infrared light into infrared light of a first band and a second band, and make the infrared light of the first band enter the first focal plane 131. The mirror 150 is disposed downstream of the beam splitter 140 along the transmission direction of the infrared light of the second band to receive and reflect the infrared light of the second band to the second focal plane 132.

[0032] With the above detector assembly, the beam splitter 140 divides the incident infrared light into infrared light of a first band and a second band, and respectively detects the infrared light of the two bands through the first focal plane 131 and the second focal plane 132. Since both the first focal plane 131 and the second focal plane 132 are disposed on the substrate 120 and are cooled by a single cold finger 110, compared with the existing dual cold finger 110 structure, the detector assembly adds a mirror 150 to enable the infrared light of the second band to enter the second focal plane 132 on the substrate 120, with a simpler structure, smaller volume and weight.

[0033] As an example, the first band is a long wave, which is 8 μm to 12 μm, and the second band is a medium wave, which is 3 μm to 5 μm; that is, the first focal plane 131 is a long-wave focal plane, and the second focal plane 132 is a medium-wave focal plane. Of course, in other embodiments, the first band and the second band can also be others, such as long wave and short wave, medium wave and short wave, medium wave and long wave, short wave and long wave, and short wave and medium wave, etc. The first focal plane 131 and the second focal plane 132 correspond to the first band and the second band respectively, and are not limited herein.

[0034] In one embodiment, the detector assembly further includes a cold head 160, and the cold head 160 is disposed at one end of the cold finger 110, and the substrate 120 is disposed on the side of the cold head 160 away from the cold finger 110. Further, the substrate 120 is a ceramic plate.

[0035] In one embodiment, the detector assembly further includes a Dewar housing 170, and the Dewar housing 170 is provided with a window 171 communicating with its interior. The cold head 160, the substrate 120, the beam splitter 140, and the mirror 150 are all located inside the Dewar housing 170. The cold head 160 is located at one end of the cold finger 110 close to the window 171, the substrate 120 is located on the side of the cold head 160 close to the window 171, the first focal plane 131 and the second focal plane 132 are located on the side of the substrate 120 facing the window 171, and the beam splitter 140 is located between the first focal plane 131 and the window 171. After the incident infrared light passes through the beam splitter 140, the infrared light of the first band directly enters the first focal plane 131 below, and the infrared light of the second band enters the mirror 150, and then is reflected by the mirror 150 to the second focal plane 132.

[0036] Further, the mirror 150 is disposed on the inner side wall of the Dewar housing 170. Specifically, in Figure 1 the illustrated embodiment, the included angle between the reflecting surface of the mirror 150 and the inner side wall of the Dewar housing 170 is 120°. In other embodiments, the mirror 150 can be arranged according to the transmission direction of the infrared light of the second band and the position of the second focal plane 132, and is not limited herein.

[0037] In one embodiment, the detector assembly further includes a lens 180, and the lens 180 is disposed on the side of the beam splitter 140 away from the substrate 120 to filter the incident light and converge the incident light on the beam splitter 140.

[0038] In one embodiment, the first focal plane 131 and the second focal plane 132 are spaced apart and disposed on the substrate 120. Specifically, in Figure 2 the illustrated embodiment, the first focal plane 131 is rectangular, the second focal plane 132 is annular, and the first focal plane 131 is located at the middle position of the second focal plane 132.

[0039] The detector assembly provided by this application has at least the following advantages:

[0040] By arranging a mirror 150 inside the Dewar housing 170, the mirror 150 reflects the infrared light in the second band to the second focal plane 132, and the infrared light in the first band directly enters the first focal plane 131, so that the first focal plane 131 and the second focal plane 132 can be simultaneously arranged on the substrate 120 and cooled by a single cold finger 110, making the structure simpler, with a smaller volume and weight and lower cost.

[0041] On the other hand, this application also provides an infrared device, which includes the detector assembly in the above embodiment.

[0042] Although the embodiments of this application have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of this application. The scope of this application is defined by the appended claims and their equivalents.

Claims

1. A detector assembly, characterized in that: include: A cold finger and a substrate, wherein the substrate is disposed at one end of the cold finger; The first focal plane and the second focal plane are both arranged on a side of the substrate away from the cold finger; A spectroscope, used for splitting the incident infrared light into infrared light of a first wavelength band and infrared light of a second wavelength band, and allowing the infrared light of the first wavelength band to be incident on the first focal plane; A reflector is disposed downstream of the beam splitter along a transmission direction of the infrared light in the second wavelength band, and is used for receiving and reflecting the infrared light in the second wavelength band to the second focal plane.

2. The detector assembly according to claim 1, characterized in that The detector assembly also includes a Dewar shell, which is provided with a window connected to its interior, the substrate, the beam splitter and the reflector are all located inside the Dewar shell, the substrate is located at one end of the cold finger close to the window, the first focal plane and the second focal plane are located on the side of the substrate facing the window, and the beam splitter is located between the first focal plane and the window.

3. The detector assembly according to claim 2, characterized in that: The detector assembly further comprises a lens, and the lens is arranged on a side of the beam splitter away from the substrate.

4. The detector assembly according to claim 2, characterized in that: The reflector is arranged on the inner side wall of the Dewar shell.

5. The detector assembly according to claim 1, characterized in that: The first focal plane and the second focal plane are arranged on the substrate at intervals.

6. The detector assembly according to claim 4, characterized in that: The second focal plane is annular, and the first focal plane is located in the middle of the second focal plane.

7. The detector assembly according to claim 1, characterized in that: The detector assembly further includes a cold head, which is arranged at one end of the cold finger, and the substrate is arranged at a side of the cold head away from the cold finger.

8. The detector assembly according to claim 1, characterized in that: The first wave band and the second wave band are both one of long wave, medium wave and short wave, and the first wave band and the second wave band are different wave bands.

9. The detector assembly according to claim 1, characterized in that: The substrate is a ceramic plate.

10. An infrared device, characterized in that: A detector assembly comprising any one of claims 1-9.

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