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In order to reduce the life-cycle cost of systems that use cryocoolers, it is necessary to extend the operating life of the cooler beyond what is currently available for tactical military applications. Several approaches have been...
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In order to reduce the life-cycle cost of systems that use cryocoolers, it is necessary to extend the operating life of the cooler beyond what is currently available for tactical military applications. Several approaches have been used to increase life such as flexure bearing and gas bearing support. It was determined that a gas bearing system offered a novel and cost effective approach for our products. This paper presents the implementation of a gas bearing system into the miniature cryocooler compressor. The theoretical analyses used to design the gas bearing system will be discussed and empirical data comparing the performance between the baseline and gas bearing coolers will be presented. A life test program is being undertaken to verify the life characteristics of the gas bearing cooler and the results will be summarized and published at a later date.
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Gimbaled Forward Looking Infrared (FLIR) cameras are placing increasing demand for cryocoolers to deliver more performance without commensurate size and weight allowances L-3 CE has re-optimized the design of its O..6-Watt cooler ...
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Gimbaled Forward Looking Infrared (FLIR) cameras are placing increasing demand for cryocoolers to deliver more performance without commensurate size and weight allowances L-3 CE has re-optimized the design of its O..6-Watt cooler to provide twice the refrigeration lift without significant changes to weight and size. This paper presents the performance characteristics of the re-optimized cooler model B610D2.
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Several thousands of 1st Gen IR Systems operated by Integral Stirling Cooler HD1033 are still in service worldwide. Replacing the HD 1033 Stirling by a Linear Drive Cooler will result in a significant reliability enhancement of th...
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Several thousands of 1st Gen IR Systems operated by Integral Stirling Cooler HD1033 are still in service worldwide. Replacing the HD 1033 Stirling by a Linear Drive Cooler will result in a significant reliability enhancement of these IR system of about a factor of three. These attempts had been unsuccessful in the past due to excessive EMI noise induced by the linear cooler compressor. So a main goal for such a development is the elimination of various EMI distortions in the IR system by EMI filtering and shielding. Additionally, the synchronization of the cooler power to the predominant scanning frequency of the IR system significantly improves the image quality. Technical details of the solution, MTTF data and performance data are described in detail.
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摘要 :
Several thousands of 1st Gen IR Systems operated by Integral Stirling Cooler HD1033 are still in service worldwide. Replacing the HD 1033 Stirling by a Linear Drive Cooler will result in a significant reliability enhancement of th...
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Several thousands of 1st Gen IR Systems operated by Integral Stirling Cooler HD1033 are still in service worldwide. Replacing the HD 1033 Stirling by a Linear Drive Cooler will result in a significant reliability enhancement of these IR system of about a factor of three. These attempts had been unsuccessful in the past due to excessive EMI noise induced by the linear cooler compressor. So a main goal for such a development is the elimination of various EMI distortions in the IR system by EMI filtering and shielding. Additionally, the synchronization of the cooler power to the predominant scanning frequency of the IR system significantly improves the image quality. Technical details of the solution, MTTF data and performance data are described in detail.
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Based on the analysis of the two existing typical linear motors for Stirling Cryocoolers, a novel structure linear motor is developed, which adopts assembled stator core and has the characteristics of high air gap flux density, sm...
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Based on the analysis of the two existing typical linear motors for Stirling Cryocoolers, a novel structure linear motor is developed, which adopts assembled stator core and has the characteristics of high air gap flux density, small volume,light weight and simple installation. Firstly, the size estimation formula is established in this paper, and then the motor parameters are optimized with the finite element method(FEM)considering the effect of changing its structure size. Analytical results show that the novel structure can significantly reduce the volume, which is specially important for the spaceflight application. The experiment verifies the feasibility and calculation accuracy of the design.
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The world growth in research and development of High Operating Temperature (HOT) IR detectors impels the development and optimization of suitable cryocoolers. The current developments at RICOR, which include three different cryoco...
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The world growth in research and development of High Operating Temperature (HOT) IR detectors impels the development and optimization of suitable cryocoolers. The current developments at RICOR, which include three different cryocooler models and two new controllers, are focused on the SWAP~2- oriented design process, meaning small Size, low Weight, low Power consumption, improved performance and lower production cost, providing proper cryocoolers for future hand held thermal imagers. This paper shows the progress made during development of "HOT" cryocooler prototypes, engineering pre-production series and qualified production series cryocoolers working at the FPA temperature range of 130 - 200K. The progress with development of electronic control modules providing minimized regulated power consumption is also shown. The progress in development of cryocoolers reliability is also reported in the paper.
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摘要 :
The world growth in research and development of High Operating Temperature (HOT) IR detectors impels the development and optimization of suitable cryocoolers. The current developments at RICOR, which include three different cryoco...
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The world growth in research and development of High Operating Temperature (HOT) IR detectors impels the development and optimization of suitable cryocoolers. The current developments at RICOR, which include three different cryocooler models and two new controllers, are focused on the SWAP~2- oriented design process, meaning small Size, low Weight, low Power consumption, improved performance and lower production cost, providing proper cryocoolers for future hand held thermal imagers. This paper shows the progress made during development of "HOT" cryocooler prototypes, engineering pre-production series and qualified production series cryocoolers working at the FPA temperature range of 130 - 200K. The progress with development of electronic control modules providing minimized regulated power consumption is also shown. The progress in development of cryocoolers reliability is also reported in the paper.
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With the achievements made in the last decade with respect to reliability and cryogenic performance, the use of Stirling and Pulse Tube cryocoolers for new application areas has become viable. Thales Cryogenics has been challenged...
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With the achievements made in the last decade with respect to reliability and cryogenic performance, the use of Stirling and Pulse Tube cryocoolers for new application areas has become viable. Thales Cryogenics has been challenged by its customers to deliver robust and compact solutions for a variety of applications.The test approaches within the Thales Environmental Test Lab - a center of excellence within the Netherlands - have been refined significantly, departing from the classical robustness testing principles, which typically consist of submitting the product to an environment with a compressed energy allocation - shorter time duration and higher PSD levels.An overview is given of recent activities at Thales Cryogenics regarding the development and testing of linear Stirling cryocoolers for extreme environmental conditions. A novel cooler will be presented that has been developed specifically for operation in high ambient temperature conditions. In addition, an overview will be given of ongoing test & development activities regarding coolers for operation under severe mechanical loads. Design aspects, margin philosophy, test plans (including robustness testing) and test results will be presented.
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摘要 :
With the achievements made in the last decade with respect to reliability and cryogenic performance, the use of Stirling and Pulse Tube cryocoolers for new application areas has become viable. Thales Cryogenics has been challenged...
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With the achievements made in the last decade with respect to reliability and cryogenic performance, the use of Stirling and Pulse Tube cryocoolers for new application areas has become viable. Thales Cryogenics has been challenged by its customers to deliver robust and compact solutions for a variety of applications.The test approaches within the Thales Environmental Test Lab - a center of excellence within the Netherlands - have been refined significantly, departing from the classical robustness testing principles, which typically consist of submitting the product to an environment with a compressed energy allocation - shorter time duration and higher PSD levels.An overview is given of recent activities at Thales Cryogenics regarding the development and testing of linear Stirling cryocoolers for extreme environmental conditions. A novel cooler will be presented that has been developed specifically for operation in high ambient temperature conditions. In addition, an overview will be given of ongoing test & development activities regarding coolers for operation under severe mechanical loads. Design aspects, margin philosophy, test plans (including robustness testing) and test results will be presented.
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摘要 :
In a Stirling-type pulse-tube cooler with a dual-opposed piston compressor, the residual vibration exported by the cooler is primarily a result of residual imbalances between compressor motors. Using an electronic feedback loop an...
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In a Stirling-type pulse-tube cooler with a dual-opposed piston compressor, the residual vibration exported by the cooler is primarily a result of residual imbalances between compressor motors. Using an electronic feedback loop and driving compressor motors in a master-slave configuration, the exported force from the compressor can be regulated to negligible levels. This has been demonstrated in a multitude of commercial applications as well as in space applications. In a novel application of the same electronic feedback technology, the residual exported forces resulting from the motion of the free moving displacer of a Stirling cold finger are compensated, by using the linear dual-opposed piston compressor as an active balancer. Theoretical analysis of this is provided, measurements are presented on different cooler types, and the effect of integration aspects - hard mount versus suspended - is discussed. The effect on exported vibration as well as power efficiency is discussed and compared between Stirling and pulse-tube type coolers. Currently available off-the-shelf hardware, the CDE7232, is presented and future developments are discussed.
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