CN107870417B - Infrared point source target simulator with controllable background radiation - Google Patents
Infrared point source target simulator with controllable background radiation Download PDFInfo
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- CN107870417B CN107870417B CN201711090729.2A CN201711090729A CN107870417B CN 107870417 B CN107870417 B CN 107870417B CN 201711090729 A CN201711090729 A CN 201711090729A CN 107870417 B CN107870417 B CN 107870417B
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- 230000005855 radiation Effects 0.000 title claims abstract description 43
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 232
- 230000003287 optical effect Effects 0.000 claims abstract description 145
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 116
- 239000007788 liquid Substances 0.000 claims abstract description 113
- 238000000034 method Methods 0.000 claims abstract description 44
- 238000005286 illumination Methods 0.000 claims abstract description 26
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 238000009413 insulation Methods 0.000 claims description 27
- 239000002184 metal Substances 0.000 claims description 22
- 229910052751 metal Inorganic materials 0.000 claims description 22
- 238000002834 transmittance Methods 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 6
- 238000012423 maintenance Methods 0.000 claims description 6
- 239000007769 metal material Substances 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 4
- 238000010992 reflux Methods 0.000 description 6
- 229910000881 Cu alloy Inorganic materials 0.000 description 4
- 238000013016 damping Methods 0.000 description 4
- 238000002309 gasification Methods 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0081—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 with means for altering, e.g. enlarging, the entrance or exit pupil
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Abstract
The invention discloses an infrared point source target simulator with controllable background radiation, which comprises: the system comprises an optical projection system, a beam combiner, an infrared point target assembly, a liquid nitrogen circulating system, a background illumination optical system and an infrared background assembly; an infrared point target source formed by the infrared point target assembly forms an infinite infrared point target through a beam combiner and an optical projection system; an infrared point source formed by the infrared background assembly is amplified by a background illumination optical system and then reflected by a beam combiner to form an infrared background which is full of the whole field of view by an optical projection system; and the liquid nitrogen circulating system carries out cooling treatment in the process of forming an infrared point target source by the infrared point target assembly and an infrared point source by the infrared background assembly. The infrared point source target simulator with controllable background radiation provides an infrared point target source with controllable background radiation, and solves the problem that the background radiation of the conventional infrared point source target simulator cannot be quantitatively controlled.
Description
Technical Field
The invention relates to the technical field of infrared point source target simulation. And more particularly to an infrared point source target simulator with controllable background radiation.
Background
Usually, a point source infrared target simulator does not control background radiation, and when some tests need to detect an infrared target by a background with a specific radiation magnitude, an infrared point source target needs to be given, and an infrared background with corresponding radiation intensity needs to be given, so that the conventional infrared target simulator cannot be sufficient.
Therefore, it is desirable to provide an infrared point source target simulator with controllable background radiation.
Disclosure of Invention
The invention aims to provide an infrared point source target simulator with controllable background radiation, and solves the problem that the background radiation of the conventional infrared point source target simulator cannot be quantitatively controlled.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides an infrared point source target simulator with controllable background radiation, which comprises: the system comprises an optical projection system, a beam combiner, an infrared point target assembly, a liquid nitrogen circulating system, a background illumination optical system and an infrared background assembly;
an infrared point target source formed by the infrared point target assembly forms an infinite infrared point target through a beam combiner and an optical projection system;
an infrared point source formed by the infrared background assembly is amplified by a background illumination optical system and then reflected by a beam combiner to form an infrared background which is full of the whole field of view by an optical projection system;
and the liquid nitrogen circulating system carries out cooling treatment in the process of forming an infrared point target source by the infrared point target assembly and an infrared point source by the infrared background assembly.
Further, the beam combiner is installed on an optical axis of the optical projection system, and a normal line of the beam combiner forms an angle of 45 degrees with the optical axis.
The beam combiner is a semi-reflecting and semi-transparent flat lens, an optical axis of the optical projection system is divided into two mutually perpendicular directions through reflection and projection respectively, the direction of reflection is perpendicular to the optical axis of the optical projection system and is named as a background optical axis, the direction pointing to the optical projection system is the positive direction of the background optical axis, and the opposite direction is the negative direction of the background optical axis; the transmission direction is coincident with the optical axis of the optical projection system and named as a target optical axis, and the direction pointing to the optical projection system is the positive direction of the target optical axis and the opposite direction is the negative direction of the target optical axis.
Further, the infrared point target assembly comprises a target diaphragm, a target diaphragm hole, a target diaphragm process hole, a target attenuation sheet, a target bearing heat insulation pad, a target low-temperature motor and a target black body;
the target diaphragm is used for reducing the background radiation in the direction of the target optical axis to the temperature of liquid nitrogen and eliminating the background radiation of a target channel; the target diaphragm is arranged on a focal plane of the optical projection system along the negative direction of a target optical axis and consists of a rectangular metal plate and a whole liquid nitrogen circulation pipeline made of metal materials, the thickness of the metal plate is about 2mm, the metal plate faces to one surface of the optical projection system, the metal plate circles and bends to weld the liquid nitrogen circulation pipeline, the input end of the pipeline is connected with a liquid nitrogen circulation system through a target liquid nitrogen input pipe, and the output end of the pipeline is connected with the liquid nitrogen circulation system through a target return pipe.
The target diaphragm process hole is used for carrying out operations such as installation, maintenance and the like on a target bearing behind the target diaphragm process hole and avoiding greatly cooling the target bearing; the target diaphragm process hole is formed in the center of the target diaphragm, and the diameter of the target diaphragm process hole is 10 mm.
The target diaphragm hole is used for constraining the infrared signal radiated by the target black body into an infrared point source; the target diaphragm hole is formed at the intersection of the upper part of the target diaphragm process hole and the target optical axis, and the diameter of the target diaphragm hole is 0.5 mm.
The target bearing, the target bearing heat insulation pad and the target attenuation sheet are fixedly connected together and rotate around the target bearing under the drive of the target low-temperature motor, so that different positions on the target attenuation sheet pass through a target optical axis, and different transmittances are provided in the direction of the target optical axis.
The target attenuation sheet is used for carrying out attenuation modulation on an infrared signal radiated by a target black body; the target bearing is from a target low-temperature motor, and the target low-temperature motor can work under vacuum and-40 ℃ environment to provide a driving force for rotary motion; and the target bearing heat insulation pad is used for connecting the target bearing and the target attenuation sheet, and does not allow heat exchange between the target bearing and the target attenuation sheet. The target attenuation sheet is a circular gradual change attenuation sheet and is arranged at the position of a target diaphragm which is 0.8mm away from the target diaphragm along the negative direction of a target optical axis, and a target bearing heat insulation pad are arranged at the center of the target attenuation sheet; the axis of the target bearing is coincided with the central axis of the target diaphragm process hole, the head of the target bearing is fixedly connected with the target attenuation sheet through the target bearing heat insulation pad, and the axis of the target attenuation sheet is coincided with the axis of the target bearing and the axis of the target diaphragm process hole.
The target blackbody is used for providing an infrared radiation source in the target optical axis direction, infrared signals radiated by the target blackbody are subjected to attenuation modulation through the target attenuation sheet, then are constrained through the target diaphragm hole to form an infrared point target source, and an infrared point target at infinity is formed through the beam combiner and the optical projection system. The target black body is arranged at a position where the target attenuation sheet is perpendicular to the target optical axis along the negative direction of the target optical axis.
Further, the infrared background assembly comprises a background diaphragm, a background diaphragm hole, a background diaphragm process hole, a background attenuation sheet, a background black body, a background bearing heat insulation pad, a background bearing and a background low-temperature motor; wherein,
the background diaphragm is used for eliminating stray radiation in the direction of a background optical axis; the background diaphragm is installed on the focal plane of background illumination optical system, comprises a rectangular metal plate and a whole piece of metal material's liquid nitrogen circulation pipeline, and metal plate thickness is about 2mm, and the metal plate is towards background illumination optical system's one side tortuous's welding liquid nitrogen circulation pipeline that circles round, and the input of pipeline is connected with liquid nitrogen circulation system through background liquid nitrogen input tube, and the output of pipeline is connected with liquid nitrogen circulation system through background back flow.
The background diaphragm process hole is used for carrying out operations such as installation, maintenance and the like on a background bearing behind the background diaphragm process hole and avoiding greatly cooling the background bearing; the background diaphragm process hole is formed in the center of the background diaphragm, and the diameter of the background diaphragm process hole is 10 mm.
The background diaphragm hole is used for constraining the infrared signal radiated by the background black body into an infrared point source; the background diaphragm hole is arranged above the background process hole and is intersected with the background optical axis, and the diameter of the background diaphragm hole is 0.5 mm.
The background bearing, the background bearing heat insulation pad and the background attenuation sheet are fixedly connected together and rotate around the background bearing under the drive of the background low-temperature motor, so that different positions on the background attenuation sheet pass through a background optical axis, and different transmittances are provided in the direction of the background optical axis.
The background attenuation sheet is used for carrying out attenuation modulation on an infrared signal radiated by a background black body; the background bearing is from a background low-temperature motor which can work in vacuum and-40 ℃ environment to provide a driving force for rotary motion; the background bearing heat insulation pad is used for connecting the background bearing and the background attenuation sheet, and does not allow heat exchange between the background bearing and the background attenuation sheet. The background attenuation sheet is a circular gradual change attenuation sheet and is arranged at the position of the background diaphragm which is 0.8mm away from the background diaphragm along the negative direction of the background optical axis, and a background bearing heat insulation pad are arranged at the center of the background attenuation sheet. The axis of the background bearing is coincided with the central axis of the background diaphragm process hole, the head of the background bearing is fixedly connected with the background attenuation sheet through the background bearing heat insulation pad, and the axis of the background attenuation sheet is coincided with the axis of the background bearing and the axis of the background diaphragm process hole.
The background black body is used for providing an infrared radiation source in the background optical axis direction, an infrared signal radiated by the background black body is subjected to attenuation modulation through a background attenuation sheet, then is constrained by a background diaphragm hole to form an infrared point target source, is amplified through a background illumination system, and then is reflected through a beam combiner to form a background which is full of the whole field of view of the optical projection system through the optical projection system; the background black body is arranged at the position where the background attenuation sheet is perpendicular to the background optical axis along the negative direction of the background optical axis.
Further, the background illumination optical system is a group of amplifying systems, and is used for amplifying the infrared point source formed by the infrared background point source assembly so as to fill the whole field of view of the optical projection system. The background illumination optical system is arranged along the negative direction of a background optical axis, and the optical axis of the background illumination optical system is superposed with the background optical axis.
Further, the liquid nitrogen circulating system is composed of a pressure pump and a liquid nitrogen storage tank and is used for storing liquid nitrogen and enabling the liquid nitrogen to flow in a circulating mode in the target liquid nitrogen input pipe, the target diaphragm and the target return pipe, the heat on the target diaphragm is recovered through the return pipe in a liquid nitrogen gasification mode and then is discharged outside the system, the liquid nitrogen is enabled to flow in the liquid nitrogen input pipe, the heat sink and the return pipe in a circulating mode, the heat on the background diaphragm is recovered through the return pipe in a liquid nitrogen gasification mode and then is discharged outside the system, and the whole system is cooled.
The target liquid nitrogen input pipe is a copper alloy pipeline, one end of the target liquid nitrogen input pipe is connected with an output port of the liquid nitrogen circulating system, the other end of the target liquid nitrogen input pipe is connected with an input port of the target diaphragm, the function of the target liquid nitrogen input pipe is that liquid nitrogen in the liquid nitrogen circulating system can enter the target diaphragm, the target reflux pipe structure is the same as that of the target liquid nitrogen input pipe, one end of the target reflux pipe is connected with the output port of the target diaphragm, the other end of the target reflux pipe is connected with a recovery port of the liquid. The background liquid nitrogen input tube is a copper alloy pipeline, one end of the background liquid nitrogen input tube is connected with an output port of the liquid nitrogen circulating system, the other end of the background liquid nitrogen input tube is connected with an input port of the background diaphragm, the function is that liquid nitrogen in the liquid nitrogen circulating system can enter the background diaphragm, the structure of the background reflux tube is the same as that of the background liquid nitrogen input tube, one end of the background reflux tube is connected with the output port of the background diaphragm, the other end of the background reflux tube is connected with a recovery port of the liquid nitrogen circulating system.
When the device works, the liquid nitrogen circulating system carries out liquid nitrogen circulation to refrigerate the target diaphragm, the distance between the target diaphragm and the target attenuation sheet is very close, the efficiency of radiation heat exchange is very high, and the heat on the target attenuation sheet is also ensured to be conducted away at any time so as to keep the low-temperature state of the target attenuation sheet; when the brightness of the target needs to be changed, the low-temperature motor drives the target bearing to rotate to the corresponding position, the attenuation area needing to work is just positioned on the target optical axis at the moment, the infrared radiation intensity of a rear target black body is adjusted, and the target is constrained by the target diaphragm hole to form a point target which is projected by the optical projection system.
The liquid nitrogen circulating system carries out liquid nitrogen circulation to refrigerate the background diaphragm, the distance between the background diaphragm and the background attenuation sheet is very close, the radiation heat exchange efficiency is very high, and the heat on the background attenuation sheet is also ensured to be conducted away at any time so as to keep the low-temperature state of the background attenuation sheet; when the brightness of the background needs to be changed, the background low-temperature motor drives the background bearing to rotate to the corresponding position, the attenuation area needing to work is just positioned on the background optical axis at the moment, the infrared radiation intensity of the background black body behind is adjusted, an infrared point source is formed through the restriction of the background diaphragm hole, and the infrared background which is full of the field of view of the optical projection system is formed after the infrared point source is amplified by the background illumination optical system.
The invention has the following beneficial effects:
the infrared point source target simulator with controllable background radiation provides an infrared point target source with controllable background radiation, and solves the problem that the background radiation of the conventional infrared point source target simulator cannot be quantitatively controlled.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Fig. 1 shows a schematic structural diagram of an infrared point source target simulator with controllable background radiation.
In the drawings: 1. the system comprises an optical projection system, 2, a beam combiner, 3, an infrared point target assembly, 30, a target diaphragm, 31, a target diaphragm hole, 32, a target diaphragm process hole, 33, a target attenuation sheet, 34, a target bearing, 35, a target bearing heat insulation pad, 36, a target low-temperature motor, 37, a target black body, 38, a target liquid nitrogen input pipe, 39, a target return pipe, 4, a liquid nitrogen circulating system, 5, a background illumination optical system, 6, an infrared background assembly, 60, a background diaphragm, 61, a background diaphragm hole, 62, a background diaphragm process hole, 63, a background attenuation sheet, 64, a background bearing, 65, a background bearing heat insulation pad, 66, a background black body, 67, a background low-temperature motor, 68, a background liquid nitrogen input pipe, 69 and a background return pipe.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below with reference to preferred embodiments and the accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
The invention provides an infrared point source target simulator with controllable background radiation, which comprises: the system comprises an optical projection system 1, a beam combiner 2, an infrared point target component 3, a liquid nitrogen circulating system 4, a background illumination optical system 5 and an infrared background component 6; an infrared point target source formed by the infrared point target component 3 forms an infinite infrared point target through the beam combiner 2 and the optical projection system 1; an infrared point source formed by the infrared background assembly 6 is amplified by the background illumination optical system 5, reflected by the beam combiner 2 and forms an infrared background which is full of the whole field of view by the optical projection system 1; and the liquid nitrogen circulating system 4 is used for cooling when an infrared point target source formed by the infrared point target assembly 3 and an infrared point source formed by the infrared background assembly 6 are in the process.
Further, the beam combiner 2 is installed on the optical axis of the optical projection system 1, and the normal of the beam combiner 2 forms an angle of 45 ° with the optical axis.
The beam combiner 2 is a semi-reflective and semi-transparent flat lens, and divides the optical axis of the optical projection system 1 into two mutually perpendicular directions through reflection and projection respectively, the direction of reflection is perpendicular to the optical axis of the optical projection system 1 and is named as a background optical axis, the direction pointing to the optical projection system 1 is the positive direction of the background optical axis, and the opposite direction is the negative direction of the background optical axis; the transmission direction coincides with the optical axis of the optical projection system 1 and is named as a target optical axis, and the direction pointing to the optical projection system 1 is the positive direction and the opposite direction of the target optical axis and is the negative direction of the target optical axis.
Further, the infrared point target assembly 3 comprises a target diaphragm 30, a target diaphragm hole 31, a target diaphragm process hole 32, a target attenuation sheet 33, a target bearing 34, a target bearing heat insulation pad 35, a target low-temperature motor 36 and a target black body 37;
the target diaphragm 30 is used for reducing the background radiation in the direction of the target optical axis to the temperature of liquid nitrogen and eliminating the background radiation of a target channel; the target diaphragm is arranged on a focal plane of the optical projection system 1 along the negative direction of a target optical axis and consists of a rectangular metal plate and a whole liquid nitrogen circulation pipeline made of metal materials, the thickness of the metal plate is about 2mm, one surface of the metal plate, facing the optical projection system 1, of the metal plate is in convoluted and tortuous welding liquid nitrogen circulation pipeline, the input end of the pipeline is connected with the liquid nitrogen circulation system 4 through a target liquid nitrogen input pipe 38, and the output end of the pipeline is connected with the liquid nitrogen circulation system 4 through a target return pipe 39.
The target diaphragm process hole 32 is used for carrying out operations such as installation and maintenance on the target bearing 34 behind the target diaphragm process hole 32 and avoiding greatly cooling the target bearing 34; the target diaphragm process hole 32 is formed in the center of the target diaphragm 30, and the diameter of the target diaphragm process hole is 10 mm.
A target diaphragm aperture 31 for constraining the infrared signal radiated by the target black body 37 into an infrared point source; the target diaphragm hole 31 is arranged above the target diaphragm process hole 32 and is intersected with the target optical axis, and the diameter of the target diaphragm process hole is 0.5 mm.
The target bearing 34, the target bearing heat insulation pad 35 and the target attenuation sheet 33 are fixedly connected together and rotate around the target bearing 34 under the drive of the target low-temperature motor 36, so that different positions on the target attenuation sheet 33 pass through a target optical axis, and different transmittances are provided in the direction of the target optical axis.
The target attenuation sheet 33 is used for performing attenuation modulation on the infrared signal radiated by the target black body 37; the target bearing 34 is from a target low-temperature motor 36, and the target low-temperature motor 36 can work under vacuum and-40 ℃ environment to provide a driving force for rotary motion; and a target bearing heat insulation pad 35 for connecting the target bearing 34 and the target damping sheet 33 while not allowing heat exchange between the target bearing 34 and the target damping sheet 33. The target attenuation sheet 33 is a circular gradual attenuation sheet and is arranged at the position of the target diaphragm 30, which is 0.8mm away from the target diaphragm 30 along the negative direction of the target optical axis, and the target bearing 34 and the target bearing heat insulation pad 35 are arranged at the center of the target attenuation sheet 33; the axis of the target bearing 34 coincides with the central axis of the target diaphragm process hole 32, the head of the target bearing 34 is fixedly connected with the target attenuation sheet 33 through the target bearing heat insulation pad 35, and the axis of the target attenuation sheet 33 coincides with the axis of the target bearing 34 and the axis of the target diaphragm process hole 32.
The target black body 37 is used for providing an infrared radiation source in the target optical axis direction, an infrared signal radiated by the target black body 37 is subjected to attenuation modulation through the target attenuation sheet 33, then is constrained through the target diaphragm hole 31 to form an infrared point target source, and forms an infrared point target at infinity through the beam combiner 2 and the optical projection system 1. The target black body 37 is mounted at the target attenuation sheet 33 in a direction perpendicular to the target optical axis in the negative direction of the target optical axis.
Further, the infrared background assembly 6 comprises a background diaphragm 61, a background diaphragm hole 61, a background diaphragm process hole 62, a background attenuation sheet 63, a background black body 66, a background bearing heat insulation pad 65, a background bearing 64 and a background low-temperature motor 67; wherein,
a background diaphragm 61 for eliminating stray radiation in the direction of the background optical axis; the background diaphragm 61 is installed on the focal plane of the background illumination optical system 5 and is composed of a rectangular metal plate and a whole liquid nitrogen circulation pipeline made of metal materials, the thickness of the metal plate is about 2mm, one surface of the metal plate, facing the background illumination optical system 5, of the metal plate is in a convoluted and tortuous welding liquid nitrogen circulation pipeline, the input end of the pipeline is connected with the liquid nitrogen circulation system 4 through a background liquid nitrogen input pipe 68, and the output end of the pipeline is connected with the liquid nitrogen circulation system 4 through a background backflow pipe 69.
The background diaphragm process hole 62 is used for carrying out operations such as installation and maintenance on the background bearing 64 behind the background diaphragm process hole 62 and avoiding greatly cooling the background bearing 64; the background diaphragm process hole 62 is arranged at the center of the background diaphragm 61 and has a diameter of 10 mm.
The background diaphragm hole 61 is used for restraining the infrared signals radiated by the background black body 66 into an infrared point source; the background diaphragm hole 61 is arranged above the background process hole and is intersected with the background optical axis, and the diameter of the background diaphragm hole is 0.5 mm.
The background bearing 64, the background bearing heat insulation pad 65 and the background attenuation sheet 63 are fixedly connected together and rotate around the background bearing 64 under the drive of the background low-temperature motor 67, so that different positions on the background attenuation sheet 63 pass through a background optical axis, and different transmittances are provided in the direction of the background optical axis.
The background attenuation sheet 63 is used for performing attenuation modulation on the infrared signal radiated by the background black body 66; the background bearing 64 is from a background low-temperature motor 67, and the background low-temperature motor 67 can work under vacuum and in an environment of-40 ℃ to provide a driving force for rotary motion; a background bearing heat insulation pad 65 for connecting the background bearing 64 and the background damping sheet 63, and not allowing heat exchange between the background bearing 64 and the background damping sheet 63. The background attenuation sheet 63 is a circular gradual attenuation sheet, and is installed at the position of the background diaphragm 61 along the negative direction of the background optical axis and 0.8mm away from the background diaphragm 61, and the center of the background attenuation sheet 63 is installed with a background bearing 64 and a background bearing heat insulation pad 65. The axis of the background bearing 64 is coincident with the central axis of the background diaphragm process hole 62, the head of the background bearing 64 is fixedly connected with the background attenuation sheet 63 through the background bearing heat insulation pad 65, and the axis of the background attenuation sheet 63 is coincident with the axis of the background bearing 64 and the axis of the background diaphragm process hole 62.
The background black body 66 is used for providing an infrared radiation source in the background optical axis direction, an infrared signal radiated by the background black body 66 is attenuated and modulated by the background attenuation sheet 63, then is constrained by the background diaphragm hole 61 to form an infrared point target source, is amplified by the background illumination system, and is reflected by the beam combiner 2 to form a background which is full of the whole field of view of the optical projection system 1 through the optical projection system 1; the background black body 66 is mounted on the background attenuation sheet 63 in a direction perpendicular to the background optical axis in the negative direction of the background optical axis.
Further, the background illumination optical system 5 is a set of amplifying systems for amplifying the infrared point source formed by the infrared background point source assembly so as to fill the whole field of view of the optical projection system 1. The background illumination optical system 5 is arranged along the negative direction of the background optical axis, and the optical axis of the background illumination optical system 5 is coincident with the background optical axis.
Further, the liquid nitrogen circulating system 4 is composed of a pressure pump and a liquid nitrogen storage tank, and is used for storing liquid nitrogen and enabling the liquid nitrogen to circularly flow in the target liquid nitrogen input pipe 38, the target diaphragm 30 and the target return pipe 39, recovering heat on the target diaphragm 30 through the return pipe in a liquid nitrogen gasification mode, then discharging the nitrogen to the outside of the system, enabling the liquid nitrogen to circularly flow in the liquid nitrogen input pipe, the heat sink and the return pipe, recovering heat on the background diaphragm 61 through the return pipe in a liquid nitrogen gasification mode, then discharging the nitrogen to the outside of the system, and cooling the whole system.
The target liquid nitrogen input pipe 38 is a copper alloy pipe, one end of the target liquid nitrogen input pipe is connected with an output port of the liquid nitrogen circulation system 4, the other end of the target liquid nitrogen input pipe is connected with an input port of the target diaphragm 30, the function is that liquid nitrogen in the liquid nitrogen circulation system 4 can enter the target diaphragm 30, the structure of the target return pipe 39 is the same as that of the target liquid nitrogen input pipe 38, one end of the target return pipe is connected with the output port of the target diaphragm 30, the other end of the target return pipe is connected with a recovery port of the liquid nitrogen circulation system 4, and the function. The background liquid nitrogen input pipe 68 is a copper alloy pipe, one end of the background liquid nitrogen input pipe is connected with an output port of the liquid nitrogen circulating system 4, the other end of the background liquid nitrogen input pipe is connected with an input port of the background diaphragm 61, the function is that liquid nitrogen in the liquid nitrogen circulating system 4 can enter the background diaphragm 61, the structure of the background return pipe 69 is the same as that of the background liquid nitrogen input pipe 68, one end of the background return pipe is connected with the output port of the background diaphragm 61, the other end of the background return pipe is connected with a recovery port of the liquid nitrogen circulating system 4, and.
When the device works, the liquid nitrogen circulating system 4 carries out liquid nitrogen circulation to refrigerate the target diaphragm 30, the distance between the target diaphragm 30 and the target attenuation sheet 33 is very close, the efficiency of radiation heat exchange is very high, and heat on the target attenuation sheet 33 is also guaranteed to be conducted away at any time so as to keep the low-temperature state of the target attenuation sheet 33; when the brightness of the target needs to be changed, the low-temperature motor drives the target bearing 34 to rotate to a corresponding position, the attenuation area needing to work is just positioned on the target optical axis at the moment, the infrared radiation intensity of a rear target black body 37 is adjusted, and the target is constrained by the target diaphragm hole 31 to form a point target which is projected by the optical projection system 1.
The liquid nitrogen circulating system 4 circulates liquid nitrogen to refrigerate the background diaphragm 61, the distance between the background diaphragm 61 and the background attenuation sheet 63 is very close, the efficiency of radiation heat exchange is very high, and the heat on the background attenuation sheet 63 is also ensured to be conducted away at any time so as to keep the low-temperature state of the background attenuation sheet 63; when the brightness of the background needs to be changed, the background low-temperature motor 67 drives the background bearing 64 to rotate to the corresponding position, the attenuation area needing to work is just positioned on the background optical axis at the moment, the infrared radiation intensity of the background black body 66 behind is adjusted, an infrared point source is formed by constraint of the background diaphragm hole 61, and the infrared background which is full of the field of view of the optical projection system 1 is formed after the infrared point source is amplified by the background illumination optical system 5.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (7)
1. An infrared point source target simulator with controllable background radiation, comprising: the system comprises an optical projection system, a beam combiner, an infrared point target assembly, a liquid nitrogen circulating system, a background illumination optical system and an infrared background assembly;
an infrared point target source formed by the infrared point target assembly forms an infinite infrared point target through a beam combiner and an optical projection system;
an infrared point source formed by the infrared background assembly is amplified by a background illumination optical system and then reflected by a beam combiner to form an infrared background which is full of the whole field of view by an optical projection system;
the liquid nitrogen circulating system carries out cooling treatment in the process of forming an infrared point target source by the infrared point target assembly and forming an infrared point source by the infrared background assembly;
the infrared background assembly comprises a background diaphragm, a background diaphragm hole, a background diaphragm process hole, a background attenuation sheet, a background black body, a background bearing heat insulation pad, a background bearing and a background low-temperature motor;
the background diaphragm is used for eliminating stray radiation in the direction of a background optical axis;
the background diaphragm process hole is used for carrying out operations such as installation, maintenance and the like on a background bearing behind the background diaphragm process hole and avoiding greatly cooling the background bearing;
the background diaphragm hole is used for constraining the infrared signal radiated by the background black body into an infrared point source; the background bearing, the background bearing heat insulation pad and the background attenuation sheet are fixedly connected together and rotate around the background bearing under the drive of the background low-temperature motor, so that different positions on the background attenuation sheet pass through a background optical axis and different transmittances are provided in the direction of the background optical axis;
the background bearing, the background bearing heat insulation pad and the background attenuation sheet are fixedly connected together and rotate around the background bearing under the drive of the background low-temperature motor, so that different positions on the background attenuation sheet pass through a background optical axis and different transmittances are provided in the direction of the background optical axis;
the background black body is used for providing an infrared radiation source in the direction of a background optical axis;
the infrared point target assembly comprises a target diaphragm, a target diaphragm hole, a target diaphragm process hole, a target attenuation sheet, a target bearing heat insulation pad, a target low-temperature motor and a target black body;
the target diaphragm is used for reducing the background radiation in the direction of the target optical axis to the temperature of liquid nitrogen and eliminating the background radiation of a target channel;
the target diaphragm process hole is used for carrying out operations such as installation, maintenance and the like on a target bearing behind the target diaphragm process hole and avoiding greatly cooling the target bearing;
the target diaphragm hole is used for constraining the infrared signal radiated by the target black body into an infrared point source;
the target bearing, the target bearing heat insulation pad and the target attenuation sheet are fixedly connected together and rotate around the target bearing under the drive of a target low-temperature motor, so that different positions on the target attenuation sheet pass through a target optical axis and different transmittances are provided in the direction of the target optical axis;
and the target black body is used for providing an infrared radiation source in the direction of the target optical axis.
2. The infrared point source target simulator of claim 1, wherein the beam combiner is mounted on an optical axis of the optical projection system, a normal of the beam combiner being at an angle of 45 ° to the optical axis.
3. The infrared point source target simulator according to claim 1, wherein the target diaphragm is composed of a rectangular metal plate and a whole metal liquid nitrogen circulation pipe, the metal plate has a thickness of about 2mm, one surface of the metal plate facing the optical projection system is a convoluted and zigzag welding liquid nitrogen circulation pipe, an input end of the pipe is connected with the liquid nitrogen circulation system through a target liquid nitrogen input pipe, and an output end of the pipe is connected with the liquid nitrogen circulation system through a target return pipe.
4. The infrared point source target simulator according to claim 1, wherein the background diaphragm is installed on a focal plane of the background illumination optical system, and is composed of a rectangular metal plate and a whole liquid nitrogen circulation pipeline made of metal material, the thickness of the metal plate is about 2mm, one surface of the metal plate facing the background illumination optical system is convolutely and meanderly welded with the liquid nitrogen circulation pipeline, an input end of the pipeline is connected with the liquid nitrogen circulation system through a background liquid nitrogen input pipe, and an output end of the pipeline is connected with the liquid nitrogen circulation system through a background return pipe.
5. The infrared point source target simulator of claim 1, wherein the background illumination optical system is used for amplifying the infrared point source formed by the infrared background point source assembly.
6. The infrared point source target simulator according to claim 1, wherein the liquid nitrogen circulation system is configured to store liquid nitrogen and circulate the liquid nitrogen in the target liquid nitrogen input tube, the target diaphragm, and the target return tube, recover heat on the target diaphragm through the return tube by gasifying the liquid nitrogen and then discharge the nitrogen to the outside of the system, and circulate the liquid nitrogen in the liquid nitrogen input tube, the heat sink, and the return tube, recover heat on the background diaphragm through the return tube by gasifying the liquid nitrogen and then discharge the nitrogen to the outside of the system, thereby cooling the entire system.
7. The infrared point source target simulator of claim 6, wherein the liquid nitrogen circulation system is composed of a pressure pump and a liquid nitrogen storage tank.
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