Far-infrared radiometers based upon high-Tc and low-Tc superconducting transition-edge thermometers

Erich N. Grossman; Carl D. Reintsema; Jonathan A. Koch; Stuart J. Berkowitz; A. S. Hirahara; Kookrin Char

doi:10.1117/12.262764

18 December 1996 Far-infrared radiometers based upon high-T_c and low-T_c superconducting transition-edge thermometers

Erich N. Grossman, Carl D. Reintsema, Jonathan A. Koch, Stuart J. Berkowitz, A. S. Hirahara, Kookrin Char

Author Affiliations +

Proceedings Volume 2842, Millimeter and Submillimeter Waves and Applications III; (1996) https://doi.org/10.1117/12.262764
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

We describe two projects aimed at applying the great temperature sensitivity of superconducting thin films when biased at heir critical temperature to high sensitivity radiometry in the 10-50 micrometers wavelength region. The first is a standards-grade system for installation in the NIST low-background infrared calibration facility. It employs thin-film Nb thermometers, and has an operating temperature of 9 K. This system's absorber is a large aperture Cu cone with a blackened interior, to which a thermometer chip is thermally grounded. The absorber and a thermal isolation platform are each thermally stabilized with separate active feedback loops that sense the resistance of their respective thermometers. Temperature control at the level of 1.4 nK has been achieved with this system. Power sensitivity is presently limited by 1/f noise to approximately 10 pW, approximately a factor of 4 better than the current system based on Ge thermistors. The second system is intended for high-sensitivity imaging arrays, and employs YBCO films on free-standing zirconia membranes. The operating temperature is 89 K for pure YBCO devices and in the range of 70-85 K for Co-doped YBCO devices, depending on doping level. The best measured performance on these devices is an optical noise-equivalent power of 1.1 pW/Hz^1/2, with an associated 3-dB rolloff frequency of 130 Hz for the pure YBCO devices and 0.6 pW/Hz^1/2 and 31 Hz for the Co-doped devices. These values represent the best performance, by approximately a factor of two in NEP and an order-of- magnitude in speed, ever reported for superconducting infrared bolometers operating at liquid-nitrogen temperature.

Citation Download Citation

Erich N. Grossman, Erich N. Grossman, Carl D. Reintsema, Carl D. Reintsema, Jonathan A. Koch, Jonathan A. Koch, Stuart J. Berkowitz, Stuart J. Berkowitz, A. S. Hirahara, A. S. Hirahara, Kookrin Char, Kookrin Char, "Far-infrared radiometers based upon high-T_c and low-T_c superconducting transition-edge thermometers", Proc. SPIE 2842, Millimeter and Submillimeter Waves and Applications III, (18 December 1996); doi: 10.1117/12.262764; https://doi.org/10.1117/12.262764

ACCESS THE FULL ARTICLE

PERSONAL SIGN IN
Full access may be available with your subscription

Email or Username Forgot your username?

Password Forgot your password?

Show

Remember Email/Username on this computer

Remember Password

No SPIE account? Create an account
or Institutional Sign In via Shibboleth

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $14.40

Non-members: $18.00 ADD TO CART

Show All Keywords

Keywords/Phrases

Search In:

Publication Years