Result: Thermal-electrical modeling of absolute cryogenic radiometers

Title:
Thermal-electrical modeling of absolute cryogenic radiometers
Authors:
PEARSON, D. A, ZHANG, Z. M
Source:
1997 Space Cryogenics WorkshopCryogenics (Guildford). 39(4):299-309
Publisher Information:
Oxford: Elsevier, 1999.
Publication Year:
1999
Physical Description:
print, 16 ref
Original Material:
INIST-CNRS
Subject Terms:
Energy, Énergie, Condensed state physics, Physique de l'état condensé, Physics, Physique, Sciences exactes et technologie, Exact sciences and technology, Physique, Physics, Generalites, General, Instruments, appareillage, composants et techniques communs à plusieurs branches de la physique et de l'astronomie, Instruments, apparatus, components and techniques common to several branches of physics and astronomy, Informatique en physique expérimentale, Computers in experimental physics, Modélisation et simulation par ordinateur, Computer modeling and simulation, Techniques, appareillages et instruments thermiques, Thermal instruments, apparatus and techniques, Cryogénie, réfrigérateurs; techniques aux basses températures, Cryogenics, refrigerators; low-temperature techniques, Capteur température, Temperature sensors, Cryogénie, Cryogenics, Etude théorique, Theoretical study, Fonction réponse, Response functions, Modélisation, Modelling, Méthode élément fini, Finite element method, Radiomètre, Radiometers, Réponse dynamique, Dynamic response, Température cryogénique, Cryogenic temperature, Temperatura criogénica
Document Type:
Conference Conference Paper
File Description:
text
Language:
English
Author Affiliations:
Department of Mechanical Engineering, University of Florida, Gainesville, FL 32611, United States
ISSN:
0011-2275
Access URL:
http://pascal-francis.inist.fr/vibad/index.php?action=search&terms=1878286
Rights:
Copyright 1999 INIST-CNRS
CC BY 4.0
Sauf mention contraire ci-dessus, le contenu de cette notice bibliographique peut être utilisé dans le cadre d’une licence CC BY 4.0 Inist-CNRS / Unless otherwise stated above, the content of this bibliographic record may be used under a CC BY 4.0 licence by Inist-CNRS / A menos que se haya señalado antes, el contenido de este registro bibliográfico puede ser utilizado al amparo de una licencia CC BY 4.0 Inist-CNRS
Notes:
Metrology
Accession Number:
edscal.1878286
Database:
PASCAL Archive

Further Information

This study employs finite-element (FE) software to model the nonlinear thermal-electrical dynamic response of absolute cryogenic radiometers (ACRs). The high-accuracy cryogenic radiometer (HACR) and laser-optimized cryogenic radiometer (LOCR) have been analyzed to determine the input geometric and thermal parameters. Comparisons between the FE model and experimental results for the HACR and LOCR show an agreement in temperature within 2%. A proportional-integral-derivative (PID) temperature-control algorithm has been developed for both the receiver and the heat sink. The optimized control parameters are related to the thermal conductances and time constants of the radiometers. The LOCR receiver has the advantage of a reduction in measurement time over the HACR receiver; whereas the HACR heat sink offers the advantage of better temperature stability over the LOCR heat sink. The time constant of the HACR receiver can be significantly reduced without degrading the performance. The temperature stability of the LOCR heat sink can be improved by a factor of two by using a larger heat-sink heat capacity, CHS≥ 80 mJ/K. This research will help improve future design of ACRs.