An improved RF circuit for Overhauser magnetometer excitation

Di Zheng; Shuang Zhang; Xin Guo; Haoyang Fu

doi:10.1117/12.2187183

27 August 2015 An improved RF circuit for Overhauser magnetometer excitation

Di Zheng, Shuang Zhang, Xin Guo, Haoyang Fu

Proceedings Volume 9595, Radiation Detectors: Systems and Applications XVI; 95950M (2015) https://doi.org/10.1117/12.2187183
Event: SPIE Optical Engineering + Applications, 2015, San Diego, California, United States

Abstract

Overhauser magnetometer is a high-precision device for magnetostatic field measurement, which can be used in a wide variety of purposes: UXO detection, pipeline mapping and other engineering and environmental applications. Traditional proton magnetometer adopts DC polarization, suffering from low polarization efficiency, high power consumption and low signal noise ratio (SNR). Compared with the traditional proton magnetometer, nitroxide free radicals are used for dynamic nuclear polarization (DNP) to enhance nuclear magnetic resonance (NMR). RF excitation is very important for electron resonance in nitrogen oxygen free radical solution, and it is primarily significant for the obtention of high SNR signal and high sensitive field observation. Therefore, RF excitation source plays a crucial role in the development of Overhauser magnetometer.

In this paper, an improved design of a RF circuit is discussed. The new RF excitation circuit consists of two parts: Quartz crystal oscillator circuit and RF power amplifier circuit. Simulation and optimization designs for power amplifier circuit based on software ADS are presented. Finally we achieve a continuous and stable sine wave of 60MHz with 1-2.5 W output power, and the second harmonic suppression is close to -20dBc. The improved RF circuit has many merits such as small size, low-power consumption and high efficiency, and it can be applied to Overhauser magnetometer to obtain high sensitive field observation.

Citation Download Citation

Di Zheng, Shuang Zhang, Xin Guo, and Haoyang Fu "An improved RF circuit for Overhauser magnetometer excitation", Proc. SPIE 9595, Radiation Detectors: Systems and Applications XVI, 95950M (27 August 2015); https://doi.org/10.1117/12.2187183

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