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Publications - Thales Cryogenics

SPIE-DSS 2014 – Adaptive vibration reduction on dual opposed piston free displacer Stirling cooler

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 [1] 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 [2] 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.

cde7232-prod

Original publication: Proc. SPIE 9070 (DOI)

R. Arts; B. de Bruin; D. Willems; G. de Jonge; A. Benschop

Presented at SPIE Defense, Security & Sensing 2014, Baltimore

ICC 2014 – A 30-50 K dual-stage pulse tube space cooler

A Technical Research Program (TRP) has been granted to the TCBV/CEA/AS consortium for the development, optimization and testing of a cryostat actively cooled by a 2-stage high reliability pulse- tube cryocooler. The interest of this concept is to allow the operation of detectors – for example QWIP or MCT infrared detectors – at lower temperatures, in the range of 35-40K, for an overall input power similar to the one required by current Earth Observation programs.  The primary objective of the activity is to develop and manufacture a two-stage pulse-tube cooler able to provide 350mW @  33K and 1200mW @ 120K with 180W input or 800mW @ 40K and 1500mW @ 130K with 160W input plus the load of one off cooler (redundant configuration). This cooler will make use of compressors previously developed for Space applications by Thales Cryogenics.  The secondary objective of the TRP program is to perform a test of this cryocooler mounted into a Breadboard 2-Stage Cryostat in order to verify the possibility to integrate such a system and to test ‘in-situ’ the cooling capabilities of the 2-Stage cryocooler. The cryostat will be designed to provide adequate mechanical, thermal and electrical interfaces between the 2-stage cryocooler, the detector assembly and the external structure. The key requirements that could critically impact the assembly, integration and testability of the cryostat equipped with the cryocooler will be discussed in this paper

P. Bruins, T. Prouvé*, I. Charles*, T.Trollier**, J. Tanchon**, J.Mullié, T.Benschop.

Thales Cryogenics BV, Hooge Zijde 14, 5626 DC, Eindhoven, NL

*Univ. Grenoble Alpes, CEA INAC-SBT, 38000 Grenoble, F

**Absolut System SAS, 5 bis rue du Champlars, 38240 Meylan, F

ICC 2014 – Cost-effective Cryocoolers for Space

In the past two decades, flexure-bearing technology has gained a firm footing in the tactical cryocooler market. This has dramatically increased the reliability of COTS (commercial off-theshelf) systems, making them a viable choice as cost-effective coolers for space missions.  Thales Cryogenics is currently involved in several projects to develop cryocoolers suitable for space applications based on its tactical heritage. An overview is presented of COTS activities for space applications now running such as the use of flexure bearing Stirling and pulse tube coolers. In the presentation design concepts and choices will be discussed. Furthermore performance graphs of the optimized cryogenic cooler performance as well as an assessment of the product robustness will be presented.

R. Arts, T. Benschop, P. Bruins, T. Rijks, G. de Jonge, T. Trollier*

Thales Cryogenics BV, Hooge Zijde 14, 5626 DC, Eindhoven, NL

*Absolut System SAS, 5 bis rue du Champlars, 38240 Meylan, F

ICC 2014 – Developments in Advanced Cooler Drive Electronics

An overview is given of the cooler drive electronics capabilities of Thales Cryogenics and the recent developments with respect to this product range. For linear Stirling and pulse-tube coolers, an update will be given regarding advances in active vibration reduction. Presently available fully adaptive Active Vibration Reduction electronics are presented and developments in the miniaturization of active vibration reduction are discussed. Results are presented of tests performed using commercial off-the-shelf drive electronics applied to linear Stirling coolers. Also, measurements with low noise force transducers rather than standard accelerometers are presented. For Rotary Stirling coolers, recent developments will be presented which have resulted in a new design for high-efficiency digital drive electronics, suitable as a drop-in replacement for legacy analog controllers.

D. Willems1, M. Tops1, F. Bots1, R. Arts1, G. de Jonge1, T.Benschop1, T. Etchanchu2

1Thales Cryogenics BV, Eindhoven, The Netherlands

2Thales Cryogénie SAS, Blagnac, France