Proton Precession Magnetometer

Order Code PPMG4A

The PPMG4A is a scalar magnetometer that measures absolute magnetic field strength with very high precision and negligible drift.

The instrument is akin to an atomic clock in that its accuracy is determined by the physical properties of sub-atomic particles, in this case by the Larmor frequency of precessing hydrogen nuclei.

Since the properties of hydrogen nuclei are fixed, the magnetometer has zero theoretical drift and requires no calibration, making it ideal as a reference or for spot measurements over long intervals.

The PPMG4A is compact and portable and can measure fields with a standard deviation or sensitivity of just 0.5nT/sqrt(Hz) at a rate of one measurement per second.

This is sufficient sensitivity to survey and identify areas of disturbed soil from thousands of years ago.

Control and reading of the magnetometer is possible via serial port. This, along with additional hardware, could be used to record survey data or to enable remote sensor reading over a radio link or network.

If you require an instrument of this nature but the PPMG4A does not appear to quite fit your requirement, please get in touch so we can quote for a custom version.

datasheet (pdf) user guide (pdf)