65 results about "Cold finger" patented technology

The invention relates to the technical field of detector testing, and discloses a multi-parameter testing system and method for thermal characteristics of a refrigeration type infrared detector, and the system comprises a cooperative measurement module, a coupling analysis module, an optimization testing module, and a data analysis platform. The method corresponds to the system. According to the application, the temperature field, stress distribution and local heat flow data of the to-be-tested detector can be synchronously acquired, and the sensor is calibrated in a low-temperature vacuum environment, so that data drift in an extreme environment is avoided, and the accuracy of actually measured data is ensured; a coupling simulation model is built based on a heat conduction equation, a reduced order model and a Maxwell model, parameters are corrected by means of measured data, and thermal load, thermal mismatch stress and refrigeration efficiency evaluation results are accurately output; the cold screen coating performance and the cold finger thermophysical property of the detector can be tested, and the special test blank of key components is filled up; and multi-source data is integrated to identify anomalies, a three-dimensional thermal field interface is output, the optimization design is assisted, and the test comprehensiveness and accuracy are integrally improved.

The utility model provides a liquid nitrogen recondensation cooling system of a high-purity germanium spectrometer, which comprises a liquid nitrogen tank and a refrigerating machine, the liquid nitrogen tank is provided with a refrigerating machine mounting hole and a detector mounting hole, the periphery of the refrigerating machine mounting hole is provided with an annular groove, the annular groove is provided with an annular elastic sealing gasket, a sealing plate is fixed above the refrigerating machine mounting hole, and the sealing plate is fixed above the detector mounting hole. The sealing plate is tightly pressed on the annular elastic sealing gasket and is in tight contact with the annular elastic sealing gasket for sealing; an opening coaxial with the refrigerator mounting hole is formed in the sealing plate, an annular elastic sealing sleeve is connected to the inner wall, located at the opening, of the sealing plate, a cold finger of the refrigerator vertically penetrates through the annular elastic sealing sleeve and extends into the liquid nitrogen tank, and the cold finger of the refrigerator is in interference fit with the annular elastic sealing sleeve. According to the liquid nitrogen recondensation cooling system, the joints of the cold finger of the refrigerating machine and the cold finger of the detector and the liquid nitrogen tank are effectively sealed, and meanwhile vibration of the refrigerating machine and the cooling fan is effectively reduced through the damping piece.

A wearable garment, such as a vest, for providing thermal conditioning, for example cooling and / or heating, to a user. The vest may be used with cryogenic temperatures. Peltier devices, pre-charged nitrogen canisters, or miniature Stirling cryocoolers may be mounted and built into the wearable or externally carried or mounted thereto. A pump, such as a vacuum diaphragm pump, causes thermally conditioned air to flow through a series of porous regenerative tubing and / or porous panels to supply conditioned air to a user of the garment. The system may use a cryocooler having a pulsating cold finger. The cryo embodiments may supply −200° C. gas through the panels or tubing. Portable systems can be carried or attached, such as HVAC, refrigeration, heating or the like. Control systems may regulate the temperature and may be adjusted by a user, for example using an input pad or a mobile device.

This infrared radiation detector comprises: – a cryostat equipped with a cold finger, suitable for heat exchange with a cold source, and a window transparent to the infrared radiation to be detected; – a cold plate, mechanically fixed and in heat exchange with the cold finger; – a detection block comprising at least one detection matrix sensitive to the range of infrared wavelengths to be detected, and in heat exchange directly or indirectly with the cold plate; – a cold screen mechanically fixed and in heat exchange with the cold plate and suitable for limiting parasitic radiation, the cold screen being equipped with at least one diaphragm or baffle (9), oriented radially with respect to the general orientation of the detector, and equipped with an opening suitable for allowing the transit of the optical path resulting from the incident radiation.The free edge (13) of said at least one diaphragm or baffle (9) is structured so as to define non-linear patterns (14). Figure for the abbreviation: Fig 6.

Embodiments of the present invention provide a frost point hygrometer apparatus utilizing dry ice and ethanol, or liquid nitrogen, as cryogenic coolant. FPH apparatus in accordance with embodiments of the present invention includes a copper cold finger with a sink immersed in a liquid cryogen to provide cooling power throughout the profile, a polished mirror disk residing at the opposite end of the cold finger with ambient air passing over it, a nichrome heater wrapped around the narrow shaft of the continuous cold finger and mirror piece to provide heat to the mirror, an optical source and detector, including an infrared light-emitting diode and a photodiode, to monitor the mirror's reflectivity as condensate accumulates in the form of dew or frost, a biconvex lens to focus the light reflected from the mirror into the photodiode, and a calibrated thermistor embedded in the mirror to measure the frost point temperature.

The present invention discloses an integrated pulse tube refrigerator, which relates to the technical field of pulse tube refrigerators. The refrigerator comprises a cold finger, a piston-type phase-adjusting mechanism, two main drive mechanisms, and a gas connection mechanism. By arranging the two main drive mechanisms and the piston-type phase-adjusting mechanism coaxially, with the cold finger arranged perpendicularly thereto, the entire device is simple and compact, with minimal loss in the connecting pipes. This achieves the goals of refrigerator integration, compactness, and high efficiency, and facilitates coupling with cooled devices. Furthermore, the use of the piston-type phase-adjusting mechanism for phase adjustment offers a wide phase adjustment range, a compact structure, and precise phase adjustment angles, contributing to high efficiency of the pulse tube refrigerator.

The application discloses a low-vibration active phase modulation composite pulse tube Stirling cryogenic refrigerator and belongs to the technical field of cryogenic refrigerators. The composite refrigerator cold finger integrates a first Stirling component as a high-temperature stage and a second pulse tube component as a low-temperature stage. The innovation is that the phase modulation unit of the second pulse tube component is composed of a second inertia tube wound and fixed in the inner circle of the gas reservoir, and the gas reservoir is integrally connected to the first cold end heat exchanger to improve the system efficiency through low-temperature arrangement. At the same time, the motion state of the compressor piston and the first displacer is monitored and cooperatively controlled in real time through the compressor displacement sensor and the cold finger displacement sensor, active and accurate phase modulation is realized, and the active vibration damper is used to perform reverse compensation according to the motion feedback of the first displacer to significantly offset the vibration output of the whole machine. The application realizes the unity of high efficiency, low vibration and high reliability, and is particularly suitable for vibration-sensitive space exploration and other application scenarios.

This invention discloses an ultrasonic-cold finger coupled plate melt crystallizer and a continuous purification process. The crystallizer body includes multiple heat exchange plates, each with a built-in serpentine refrigerant channel; multiple ultrasonic vibrating plates are sequentially arranged around the shell of the plate melt crystallizer to provide an ultrasonic field covering the entire crystallizer body; at least one cold finger assembly is located on top of the plate melt crystallizer and connected to the upper cover plate of the crystallizer body via a detachable flange. The cold finger assembly includes an inlet manifold, an outlet manifold, a cold finger body, and an ultrasonic probe. The inlet and outlet manifolds are arranged parallel to each other above the crystallizer body along a second direction. The bottom of each cold finger body is located within the crystallizer body, and its top two ends are connected to the inlet and outlet manifolds, respectively. The ultrasonic probe extends along a third direction and is inserted into the interior of the cold finger body. Using the melt crystallizer and process of this invention enables higher crystallization efficiency and greater product yield.

The application provides a space refrigeration equipment vibration composite control system and method, comprising: a passive vibration isolation module and an actuation module; the passive vibration isolation module performs preliminary attenuation on the vibration of a compressor in the space refrigeration equipment in a passive vibration isolation mode, reduces the transmission of the vibration of the compressor from a base plate to a cold finger end detector; the actuation module performs attenuation on residual vibration transmitted from the compressor to the cold finger end through a connecting pipe in an active vibration suppression mode, so as to suppress the micro-vibration of the gas in the connecting pipe from the compressor to the cold finger end caused by uneven flow; and performs attenuation on residual vibration transmitted from the compressor to the cold finger end through the base plate in an active vibration suppression mode. The application is suitable for guaranteeing that the space vehicle load refrigeration equipment outputs minimal disturbance, and avoiding affecting the resolution and stability of the load.

The expander assembly of the Stirling cryocooler comprises a cold finger provided with a cold finger air cylinder, a cold finger air cylinder, a cold finger air cylinder and an expander assembly, a shell of the regenerator is in clearance fit with the cold finger air cylinder; the base is connected with the cold finger, and a gas flowing cavity is formed in the base; the spring is respectively connected with the base and the regenerator shell; the expansion machine assembly further comprises a lining connected with the outer wall face of the regenerator shell. The hot end air cylinder is connected and matched with the cold finger air cylinder in a sleeved mode and connected with the inner wall face of the cold finger air cylinder, the hot end air cylinder is arranged outside the lining in a sleeved mode, and the hot end air cylinder and the lining are in clearance seal. According to the application, only the dynamic gap of the hot end cylinder and the lining needs to be sealed, and the gap between the whole regenerator shell and the whole cold finger cylinder does not need to meet the gap sealing requirement, so that the sealing length can be greatly reduced, and meanwhile, the universality between the cold finger cylinder and the regenerator is not influenced.

The utility model belongs to the technical field of throttling refrigerators, and particularly provides a long cold accumulation throttling refrigerator and an infrared detector, the long cold accumulation throttling refrigerator comprises a cold finger cylinder and a bottom flange; the cold finger cylinder is mounted on the bottom flange; the bottom flange is provided with a plurality of fixing parts used for being fixed to a cold finger air cylinder. The area, located between every two adjacent fixing parts, of the bottom flange is a backflow outlet area. A part of the backflow outlet area is provided with a backflow outlet communicating the interior of the cold finger air cylinder with the outside. The backflow outlets for communicating the interior of the cold finger air cylinder with the outside are only formed in part of the backflow outlet areas, the size of the total cross section of the backflow outlets is changed, and existing backflow outlets formed in all the backflow outlet areas are changed into backflow outlets formed in part of the backflow outlet areas and communicated with the outside atmosphere. According to the structure that part of the backflow outlet area makes contact with the plane of the cold finger air cylinder, the size of the gap between the cold finger air cylinder and the bottom flange is changed, the aim of prolonging the residence time of backflow gas is achieved on the premise that the cooling time is not affected, and the cold storage capacity of the refrigerator is improved.

This infrared radiation detector comprises: - a cryostat provided with a cold finger, capable of ensuring heat exchange with a cold source, and a window transparent to the infrared radiation to be detected; - a cold plane, mechanically fixed to and in a heat exchange relationship with the cold finger; - a detection block comprising at least one detection matrix sensitive to the infrared wavelength range to be detected, and in a heat exchange relationship directly or indirectly with the cold plane; - a cold shield mechanically fixed to and in a heat exchange relationship with the cold plane and capable of limiting parasitic radiation, the cold shield being provided with at least one diaphragm or baffle (9), oriented radially with respect to the overall orientation of the detector, and provided with an opening capable of allowing the transit of the optical path resulting from the incident radiation. The free edge (13) of the at least one diaphragm or baffle (9) is structured such that non-linear patterns (14) are defined.

The invention relates to the technical field of oil gas recovery treatment, and provides a lubricating oil gas treatment system, and a pulse tube refrigeration device is arranged at an exhaust port of an oil tank, so that a condenser is located between the exhaust port and an inlet of an exhaust pipeline. When the lubricating oil gas is increased and the air pressure is increased, the lubricating oil gas enters the condenser of the pulse tube refrigeration device and is in full contact with condensation sheets of the condenser, and the condenser leads out heat through a cold finger, so that the lubricating oil gas is liquefied and flows back into a lubricating oil tank, and the recycling of the lubricating oil gas is realized; and the air pressure in the lubricating oil tank is controlled, so that the lubricating oil in the oil tank can work normally. According to the lubricating oil gas treatment system, the structure is simple, the condensation single bodies in the condenser can be detached and replaced, and the maintenance difficulty and cost are reduced. Meanwhile, oil gas of the lubricating oil is fully treated, and pollution to the environment is avoided.

The utility model belongs to the technical field of single crystal continuous casting, and particularly relates to a small-diameter metal wire single crystallization treatment device which is characterized in that a guide tube, a crucible and a casting mold are sequentially arranged in a quartz tube along the axial direction, a cooler sleeved outside the casting mold is arranged at the right end of the quartz tube, and a cold finger is connected to the right side of the cooler; induction coils are correspondingly arranged on the outer side of the quartz tube and the left side of the crucible and the casting mold, the induction coils extend from the left end of the crucible to the casting mold, and the distance between every two adjacent coils is gradually increased; the ratio of the axial length of the cold finger to the axial length of the casting mold is a fixed value. According to the technical scheme, by improving the single-crystallization treatment device for the small-diameter metal wire, continuous heating and melting, continuous dummy ingot and continuous feeding of a matched system are achieved, and the limitation of the single-crystal continuous casting technology on the diameter and length of the prepared single-crystal wire can be solved.

The Dewar shell structure comprises a Dewar cold finger, a flange used for being coupled with a refrigerator is arranged at the lower end of the Dewar cold finger, a Dewar shell is welded to the interior of the upper end of the Dewar cold finger, and the outer surface of the Dewar shell and the outer surface of the Dewar cold finger are both provided with stripe-shaped protrusions. The outer part of the upper end of the Dewar cold finger is welded with the Dewar light window; in order to ensure the temperature controllability of the window seat part, the Dewar shell structure is optimized, on one hand, the heat dissipation area of the Dewar shell structure is increased through turning or carving to enhance the heat dissipation capacity of the Dewar shell, and on the other hand, the heat conduction heat flux is reduced by increasing the solid heat transfer distance from the Dewar top window seat to the assembly hot end; and the temperature rise of the shell and the top detection window seat of the Dewar can be effectively controlled.

The application relates to a high-reliability cryocooler micro-vibration insulation system and belongs to the technical field of satellites; a support Dewar is installed on the upper surface of a cold finger flange; a coupling substrate is placed on the top of the support Dewar; the top end of a support column is connected with the coupling substrate, and the bottom end is connected with the cold finger flange; a pyrotechnic cutter and a conductive sensor are arranged on the support column; a detector Dewar cover is installed on the coupling substrate; a splicing substrate is installed on the coupling substrate; a detector device is installed on the splicing substrate; a cryocooler cold head extends into the inner cavity of the support Dewar from the bottom of the cold finger flange; a flexible cold chain is arranged on the top of the cryocooler cold head and is connected with the coupling substrate; a vacuum pump is in communication with the detector Dewar; a water cooler is in communication with the cold finger flange; the application can not only guarantee that the launch section effectively supports the detector assembly but also guarantee that the support end and the detector assembly are physically isolated during the in-orbit period, so that the micro-vibration generated by the cryocooler during in-orbit work is insulated from the detector.

The invention provides a waste salt treatment process and system based on a melt crystallization method, the waste salt treatment process is a process combining pulling crystallization, zone condensation and cold finger / cooling plate crystallization, and matrix salt is recovered from a chloride molten salt system containing strontium element and / or barium element and / or cesium element. The invention aims to solve the problems that the treatment scale and the product purity are difficult to consider at the same time, the volatilization loss is serious, and dual targets are difficult to realize under complex working conditions in the existing dry post-treatment waste salt melt crystallization purification technology. A waste salt melt crystallization purification technology which can adapt to complex working conditions, give consideration to high purification efficiency and high resource recovery rate and meet the large-scale treatment requirement is researched and developed, radioactive waste salt containing splitting elements is treated through process fusion, efficient purification of the waste salt is finally achieved, and the high removal rate and recovery rate are achieved.

The application relates to an expander assembly and a Stirling refrigerator, which comprises an expander base, a cold finger in sealed connection with the expander base, a pusher assembly in the expander base and the cold finger, and an expansion cavity formed by the cold finger and the pusher assembly; and a magnetic spring assembly arranged close to the expansion cavity and used for generating a magnetic force applied to the pusher assembly, wherein the action direction of the magnetic force is opposite to the movement direction of the pusher assembly during movement. The magnetic part of the application is continuously in a low-temperature environment, so as to continuously have a larger magnetic flux, and the magnetic part is prevented from falling off due to debonding, and meanwhile, the overall volume of the product is further reduced, so that the product structure is more compact.

The utility model belongs to refrigerating machine technical field, concretely provides an expander, including cold finger protection cylinder and the base connected in cold finger one end, the cold finger is inlaid with the cold accumulator of sliding, the cavity that base and cold finger enclose forms is equipped with the guide piston, one end of guide piston is fixedly connected with base, the other end sliding sleeve joint has guide cylinder, guide cylinder with cold accumulator is connected. The utility model provides this kind of expander of improvement guide piston and guide cylinder's relative motion structure, make guide cylinder move forward and backward relative to piston after being subjected to gas force, carry out gas compression and expansion to refrigerate, guide piston can be integrated with expander base and process, reduce processing cost. Simultaneously still can join magnetic force spring subassembly, replace leaf spring in axial direction and carry out the location, can effectively reduce the risk of cylinder collision.

The present invention discloses a regenerative packing sealing device and a cold finger structure, relating to the technical field of regenerative refrigerators. The regenerative packing seal comprises a sealing screen, a sleeve, and a pressure ring. The sleeve is configured to be sleeved over a pulse tube, with the sleeve axis parallel to the pulse tube axis. One end of the sleeve is configured to extend into the outer shell of the regenerative unit. The pressure ring is sleeved and fixedly connected to the sleeve. The mesh size of the sealing screen is smaller than the particle size of the regenerative packing. The sealing screen is sleeved over the sleeve and positioned within the regenerative unit. The sealing screen can cover the annular opening at the bottom of the regenerative unit. The downward-facing side of the pressure ring can press the sealing screen tightly against the outlet end of the heat exchanger. The regenerative packing sealing device and cold finger structure prevent the regenerative packing from leaking, achieving a better sealing effect.

The present invention discloses a miniature, compact, integrated linear Stirling refrigerator, comprising a cold finger assembly, a linear compressor assembly, and an integrated base assembly. The cold finger assembly and the linear compressor assembly are mounted on the integrated base assembly in a T-shaped configuration. The present invention utilizes a compact structure in which the cold finger assembly and the linear compressor are mounted together on the integrated base assembly, with the cold finger assembly radially embedded within the linear compressor. This facilitates installation and removal by the user. Compared to a split-type Stirling refrigerator, the present invention eliminates the need for a connecting pipe structure, reduces the dead volume of the refrigerator, and improves the cooling efficiency of the refrigerator.

The utility model relates to the field of refrigerating machines, in particular to a high-degree-of-freedom rotary type refrigerating machine pushing assembly which comprises a cold finger, a cold storage device matched with the cold finger is arranged in the cold finger, and a magnetic core is connected to the cold storage device. The magnetic sleeve is installed in the cold finger and located at the position, corresponding to the magnetic core, of the inner wall of the cold finger; the rotary Stirling cryocooler has the beneficial effects that by embedding the magnetic sleeve in the cold finger and arranging the magnetic core at the end part of the piston, deflection of the relative position of the regenerator is limited, the stability of a movement assembly is improved, and meanwhile, the service life and the reliability of the rotary Stirling cryocooler can be further improved.

The utility model relates to the field of refrigeration and low temperature engineering and infrared, concretely is a kind of throttling refrigerator, it include: air inlet flange, the central position of air inlet flange is equipped with air inlet hole;Heat exchanger, it is set in the upper end surface of air inlet flange, heat exchanger includes the at least two layers of heat exchange pipe of upper and lower layer arrangement, the adjacent two layers of heat exchange pipe are connected, and each layer of heat exchange pipe is spiral disc cloth;Dewar cold finger, it is sleeved in the outer surface of heat exchanger;Beneficial effect is: normal temperature high pressure refrigeration gas enters heat exchanger in the air inlet hole on air inlet flange, in each layer heat exchange pipe inside heat exchanger, then spiral flow in turn, then from the throttling hole of top layer heat exchange pipe, produce throttling refrigeration effect, form low temperature gas, cooling object such as chip is cooled by low temperature gas, by the spiral disc cloth setting of multilayer heat exchange pipe, greatly increase the heat exchange unit number of heat exchanger, to improve the heat exchange efficiency of refrigerator.

The application discloses an adaptive heat-insulating support structure of an ultra-long linear infrared detector, which comprises a support column, a detector mounting base plate, a cold contraction support, a cold finger and a bottom plate; the upper end of the cold finger is fixed to the lower surface of the detector mounting base plate, and the lower end of the cold finger is fixedly connected with the bottom plate; the lower end of the support column is fixedly connected with the bottom plate; the upper end of the support column is provided with the cold contraction support, and the detector mounting base plate is fixedly connected with the cold contraction support. By virtue of the characteristics that the ultra-long linear infrared detector for space use has no mechanical environment under low-temperature working conditions, the cold contraction size change of the detector mounting base plate and the cold contraction support structure under low temperature is utilized, so that the effects of low stress and low heat leakage are realized.

The invention discloses a high-reliability space mechanical refrigerator system-level micro-vibration suppression system, and relates to the technical field of micro-vibration control, the high-reliability space mechanical refrigerator system-level micro-vibration suppression system comprises a compressor, a refrigerator cold finger, a mounting bracket, a flexible cold chain, a mounting substrate and an active vibration reduction and refrigerator driving integrated circuit, a force sensor group in a four-point layout is adopted between a refrigerator mounting bracket and a mounting substrate, and 12 interface force signals are collected in real time to serve as global feedback; meanwhile, a redundant active vibration reduction assembly composed of four vibration absorbers is installed on the side face of the support. The defects of acceleration feedback non-co-location control are overcome, the problems that a traditional passive vibration isolation system is low in low-frequency vibration isolation efficiency, a locking and releasing mechanism needs to be additionally arranged on a transmitting section, and consequently the structure is complex are solved, and the reliability of an aerospace task is remarkably improved.

The application discloses a precision assembling method of an infrared detector process Dewar, and belongs to the technical field of Dewar assembling of infrared detectors. The method comprises the following steps: cleaning and pretreating materials, and assembling a cold finger and a detector. In the application, the method adopts a nanometer-level thermal interface of the cold finger and the detector chip, can effectively guarantee thermal conductivity, effectively reduce thermal noise, improve a signal-to-noise ratio, and can effectively control a thermal load of the cold finger, so that the detector can stably work at a lower temperature and the performance of the detector is improved. The method adopts electron beam and laser welding, can greatly reduce a leakage rate, and adopts a non-evaporable getter to adsorb residual gas, can improve vacuum maintenance time in the infrared detector, and improve product quality. The method realizes breakthroughs of the infrared detector Dewar in sensitivity, stability, service life and the like through optimization of a whole chain of materials, processes and detection, and is especially suitable for high-precision military and space infrared systems.

This invention discloses an aerospace-grade multi-source, high-capacity, ultra-low-vibration refrigerator device, relating to the field of refrigerators. It includes a refrigerator, a vibration isolation unlocking device, a vibration feedback sensor, an active vibration reduction control circuit, a heat collection plate, a flexible cold chain, a low-temperature heat pipe, and a low-leakage cold finger protection structure. The refrigerator is mounted on one side of the heat collection plate, thermally conductively integrated with it. The flexible heat pipe is installed on the other side of the heat collection plate to transfer heat from the refrigerator to the outside. The vibration feedback sensor is installed at the vibration source end of the refrigerator to monitor the vibration signal. The active vibration reduction control circuit is connected to multiple driving refrigerators and vibration feedback sensors. It collects vibration signals from the vibration feedback sensors and drives the opposing motors within each refrigerator to achieve active vibration reduction from multiple sources. This invention has a very high degree of integration, achieving active and passive vibration reduction, heat dissipation, temperature equalization, and cold capacity transfer within a limited space, and realizing mechanical isolation between high-vibration, high-heat components and high-precision loads.

Thermal energy transmission from a cryocooler cold finger is enhanced by means of a high thermal conductivity material used for or placed adjacent the cold finger end cap. In addition, the actual or effective surface area contacted by the working gas proximate the endcap is increased, thereby increasing the convective heat transfer coefficient. These features permit the coolest gas expansion space in the cold finger to be provided within the highly thermally conductive end cap, unlike many conventional designs in which the cold finger of low thermally conductive metal forms the expansion space side walls and the endcap forms only the axially facing outer surface in contact with the cooled equipment. Having the expansion space built into the high thermally conductive end cap reduces the temperature drop between the load to be cooled and the gas (e.g., helium), thus increasing the thermodynamic cycle efficiency.

A cryogenic RF device comprising: a cryogenic enclosure, a cryocooler cold-finger, a sensor, an electromagnetic shield, and a thermal shield. The cryogenic enclosure is capable of maintaining an internal high-vacuum cryogenic environment and includes a radome and a vacuum chamber. The radome is, and the vacuum chamber is not, substantially transparent to desired RF signals. The sensor is disposed on the tip of the cold-finger in the radome. The electromagnetic shield is disposed within the vacuum chamber so as to shield electronic circuitry, but not the sensor, from external electromagnetic radiation. The thermal shield is disposed within the vacuum chamber so as to electrically isolate the electromagnetic shield from vacuum chamber walls. The electromagnetic shield and the thermal shield are electrically- and thermally-isolated from the cold-finger. The electromagnetic shield is electrically connected to at least one grounded electrical conductor that passes through an electrically-isolated feedthrough on the vacuum chamber.

The invention relates to a device (3) for detecting infrared electromagnetic radiation, the device comprising a housing (5) that defines a vacuum chamber (7) and comprises a window (9) transparent to the infrared electromagnetic radiation, wherein the device (3) comprises, positioned in the chamber (7), one end of a cold finger (15), a cold shield (11), and a sensor (13), wherein the cold shield (11) and the sensor (13) are configured to be cooled by the cold finger (15), and wherein the cold shield (11) comprises an opening (17) configured to allow the infrared electromagnetic radiation to pass from the window (9) to the sensor (13), and wherein the device (3) comprises a filter (29) positioned along the path of the infrared electromagnetic radiation between the window (9) and the sensor (13), wherein the filter (29) is configured to transmit or reflect rays of the infrared electromagnetic radiation depending on their angle of incidence on the filter (29).