Evading surface and detector frequency noise in harmonic oscillator measurements of force gradients.

ABSTRACT: We introduce and demonstrate a method of measuring small force gradients acting on a harmonic oscillator in which the force-gradient signal of interest is used to parametrically up-convert a forced oscillation below resonance into an amplitude signal at the oscillator's resonance frequency. The approach, which we demonstrate in a mechanically detected electron spin resonance experiment, allows the force-gradient signal to evade detector frequency noise by converting a slowly modulated frequency signal into an amplitude signal.

SUBMITTER: Moore EW 

PROVIDER: S-EPMC2924902 | biostudies-other | 2010 Jul

REPOSITORIES: biostudies-other