{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

L06-page9 - Frequency(C Larger fields> higher frequencies...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
9 Proton Precession Magnetometer • Two coils surrounding bottle of water or hydrogen rich fluid. • One to induce field in different direction then natural field. • One to measure voltage caused by precessing protons. • Measurement process: Protons originally aligned with natural field (A). External coil is energized with a DC current resulting in a strong B field that aligns protons (B). Current turned off; protons precess back to alignment with external field, generating AC current in receiver coil at Larmor
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Frequency (C). Larger fields -> higher frequencies Proton Precession Magnetometer • Advantages • Don’t have to align ‘bottle’ with field. • Fairly lightweight yet rugged. • Disadvantages • Can’t record continuously • Can’t measure vector field • Measurement accuracy : • 0.1 to 1nT with sampling time of 0.5 to 2s. • Can get 0.1 nT accuracy if we have 0.004 Hz frequency resolution....
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online