Uncooled resistive metal foil bolometers for imaging with radiofrequency magnetic fields

Jeffrey M. Jennings; Raj Vaidyanathan; Aravinda Kar

doi:10.1117/12.2305042

14 May 2018 Uncooled resistive metal foil bolometers for imaging with radiofrequency magnetic fields

Jeffrey M. Jennings, Raj Vaidyanathan, Aravinda Kar

Proceedings Volume 10656, Image Sensing Technologies: Materials, Devices, Systems, and Applications V; 106560F (2018) https://doi.org/10.1117/12.2305042
Event: SPIE Commercial + Scientific Sensing and Imaging, 2018, Orlando, FL, United States

Abstract

A set of experiments were conducted looking at how characteristics of loop elements in an array affect their detected induced current and subsequent Joule heating when located in a radio frequency magnetic field. These experiments included evaluations of the observed steady state temperature rise versus the radius of the loop, the location of the loop with respect to the RF source, and the effect on steady state temperature rise when other loops were brought into close proximity. Loop elements were then combined into a radially-symmetric, five-element array which was used to create a coarse magnetic image of a simple piece of aluminum sheet. After normalization, the temperature rise versus loop size results showed a direct linear relationship which enabled prediction of the lower element size threshold based on the properties of existing thermosensing layer materials used in other bolometer applications and the typical performance of analog measurement equipment. Offset sample test results show how the RF field varied linearly across a given plane perpendicular to the RF source transmission axis, increasing as the distance between the sample and one side of the Helmholtz coil is reduced. Separation distance test results also reveal the RF magnetic field cancellation effects due to mutual coupling as the separation between closed-loop elements are brought into close proximity. Lastly, the excellent agreement achieved between the captured image and the actual object show promise in creating an imaging system with significant resolution and contrast differentiation.

Conference Presentation

Citation Download Citation

Jeffrey M. Jennings, Raj Vaidyanathan, and Aravinda Kar "Uncooled resistive metal foil bolometers for imaging with radiofrequency magnetic fields", Proc. SPIE 10656, Image Sensing Technologies: Materials, Devices, Systems, and Applications V, 106560F (14 May 2018); https://doi.org/10.1117/12.2305042

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

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