The invention relates to a low-temperature infrared lens supporting device based on radial flexible unloading. The device comprises a lens frame main body, a lens bonding block and a mounting point unloading block. The mirror frame body is of an annular supporting structure. The infrared lens is arranged in the lens frame main body, and is fixedly connected with the lens frame main body through the lens bonding block. The mounting point unloading blocks are fixedly connected to the mirror frame main body in a three-point circumferential uniform distribution form. The mounting stress unloadingcapacity of the mounting point unloading block is achieved through mounting-dismounting-mounting treatment in the connecting process of the mounting point unloading block and an external supporting structure, and thermal deformation unloading of the infrared lens device is achieved in the radial direction of a lens and the radial direction of a lens frame through the flexible grooving unloading configuration of the lens bonding block and the mounting point unloading block under the temperature change. Through the design of the bonding force of the radial glue spots and glue injection control,full-radial direct bonding can be achieved, axial limiting and pressing of the lens are not needed, and the problem that the surface shape of the lens is reduced due to axial stress in the low-temperature environment is solved.

Low-temperature infrared lens supporting device based on radial flexible unloading

The invention particularly relates to a stray light suppression device which is used for overcoming the defect that in the prior art, when stray light is reduced, a refrigeration part is dewed, and then an optical element and an electrical element are damaged. The stray light suppression device comprises a sealed cavity arranged between optical systems in a carrier lens barrel, a cold wall which is arranged in the sealed cavity and is separated from the carrier lens barrel structure, and a refrigeration pipe; the cold wall is connected with the carrier lens barrel through a heat insulation part; the refrigeration pipe contacts the outer wall of the cold wall and is used for making the cold wall reach the preset temperature through the refrigeration loop. According to the invention, the carrier lens barrel is separated from the refrigeration element, so that refrigeration and mechanical positioning of the optical system are not mutually restricted; accurate control of the temperature ofthe cold wall in the lens barrel can be realized; and the temperature is low and dew formation is avoided.

Stray light suppression device

The invention relates to equipment for testing the low-temperature target detection capability of an infrared camera under a deep space background, and belongs to the technical field of infrared camera detection capability testing. The device comprises an adjusting frame, a cold shield, a target black body, a background black body, a heating piece, a thermal switch, a first refrigerator, a secondrefrigerator, a molecular pump unit, a first compressor, a water chilling unit, a second compressor, a helium cylinder, a supporting frame, a temperature controller and a linear power supply, whereinthe device is used for performing ground testing of the dynamic range of a satellite-borne infrared camera and is important corollary equipment for Mars detection. The device is advantaged in that thetemperature of the background black body is controlled to be less than 40K, the temperature range of the target black body is controlled to be changed from 40K to 420K, temperature control precisionis +/-0.1 K, and temperatures of two black bodies are independently controllable; temperature change of an ultralow-temperature target is simulated, and the detection capability of the infrared cameraon the ultralow-temperature target is realized.

Equipment for testing low-temperature target detection capability of infrared camera under deep space background

The invention provides a deep low temperature grading refrigeration and heat insulation system for a space infrared remote sensor, comprising a light shield (1), a lens assembly, a heat insulation rod, a focal plane refrigerator (7), a multi-layer heat insulation assembly (8), a cold shield assembly (9), a cold shield refrigerator (10), a lens refrigerator (11), a heat insulation ring (12), a focal plane detector (13), a detector support structure (14), and a bearing cylinder (15). The lens refrigerator and the cold shield refrigerator respectively cool the lens assembly and the cold shield assembly enveloping the outside of the lens assembly to finally cool the optical lens to a deep low temperature. The focal plane refrigerator cools the focal plane detector assembly to cool the focal plane device to a deep low temperature. Compared with the prior art, the deep low temperature grading refrigeration and heat insulation system for the space infrared remote sensor realizes the deep lowtemperature grading refrigeration and heat insulation of all-optical system of the space infrared remote sensor, and effectively reduces the background noise of the system. The system can be widely applied to the detection of weak targets and the imaging of large temperature range and has good use value.

Deep low temperature grading refrigeration and heat insulation system for space infrared remote sensor

The invention discloses a low-temperature lens compression release type thermal stress elimination supporting structure which comprises a bearing structure, a lens mounting flange, an axial stress elimination compressing structure, a compression screw, radial positioning columns and a radial positioning column pressure cover. The supporting structure has advantages that due to characteristics of normal-temperature installation and adjustment and low-temperature operation of a low-temperature aluminum lens, the low-temperature lens can be fixedly clamped under a large pre-tensioning force at the normal temperature by the structure to meet dynamic stiffness requirements in transport and transmission of the low-temperature lens; in low-temperature operation, compression force release is realized by deformation difference generated by low-temperature shrinkage of the lens mounting flange and the axial stress elimination compressing structure, so that the low-temperature aluminum lens is capable of freely contracting to eliminate thermal stress. By normal-temperature compression and low-temperature release, high dynamic rigidity can be achieved while thermal stress elimination at an operating temperature is realized, and the supporting structure is applicable to thermal stress elimination supporting of low-temperature lenses operating at a deep low temperature.

Liu Bing

Papers

Deep low temperature grading refrigeration and heat insulation system for space infrared remote sensor

Low-temperature lens compression release type thermal stress elimination supporting structure