Abstract
A spaceborne cryogenic cooler induces undesirable microvibration disturbances during its on-orbit operation, which is one of the main sources that degrades the image quality of submeter-level high-resolution observation satellites. Several types of vibration isolation systems based on passive approaches have been developed for reducing the microvibration of the cooler. A coil-spring-type passive vibration isolation system developed in a previous study has shown excellent performance in both launch vibration and on-orbit microvibration isolation. To improve the capability of the conventional cooler isolator, including the position sensitivity and launch vibration reduction, we propose a new version of a dual coil-spring-type passive vibration isolator system. The effectiveness of the newly proposed design was validated through a microjitter measurement test, position sensitivity test, and qualification-level launch vibration test of the isolator.
Highlights
Spaceborne pulse tube-type cryogenic coolers are widely used to cool the focal plane of an infrared imaging sensor, because of advantages such as low cost, a simple mechanism, high reliability, low mechanical vibration, and an electronic noise comparison with the traditional Stirling-type cooler [1,2,3]
Richard et al [5] proposed a hexagonal-type isolator with low-stiffness to support the spaceborne cooler. The validity of this system was verified through vibration isolation experiments, and the results indicated that the system exhibits 20 dB of isolation performance for the cooler harmonic disturbances
The validity of the proposed system was verified through vibration isolation experiments, and the results indicated that the system exhibits 20 dB of isolation performance for the cooler harmonic disturbances
Summary
Spaceborne pulse tube-type cryogenic coolers are widely used to cool the focal plane of an infrared imaging sensor, because of advantages such as low cost, a simple mechanism, high reliability, low mechanical vibration, and an electronic noise comparison with the traditional Stirling-type cooler [1,2,3] These coolers generate undesirable microvibrations during on-orbit operation, which may seriously affect the performance of microvibration-sensitive payloads of high-resolution observation satellites, even though the vibration level is much lower than that of the Stirling-type cooler. Riabzev et al [7] proposed a multidimensional passive vibration isolator including a triple-stage spring mass system mounted on an oscillating cold tip of the cooler, which has low stiffness characteristics in the lateral direction of the coil spring The effectiveness of this isolation system was investigated by incorporating an analytical model and performing an experiment. Veprik et al [8] proposed a vibration protection system for infrared applications
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