A magnetometer in which a coil is rotated in the magnetic field to be measured with the resulting generated voltage being proportional to the strength of the magnetic field.


Related Terms

DIRECTIVITY FACTOR

  1. The ratio of radiated sound intensity at a remote point on the principal axis of a loudspeaker or other transducer, to the average intensity of the sound transmitted through a sphere passing through the remote point and concentric with the transducer; the frequency must be stated.
  2. The ratio of the square of the voltage produced by sound waves arriving parallel to the principal axis of a microphone or other receiving transducer, to the mean square of the voltage that would be produced if sound waves having the same frequency and mean-square pressure were arriving simultaneously from all directions with random phase; the frequency must be stated.

POLARITY EFFECT

An effect for which the breakdown voltage across a vacuum separating two electrodes, one of which is pointed, is much higher when the pointed electrode is the anode.

PIEZOELECTRIC GAGE

A pressure-measuring gage that uses a piezoelectric material to develop a voltage when subjected to pressure; used for measuring blast pressures resulting from explosions and pressures developed in guns.

PHOTOVOLTAIC EFFECT

The production of a voltage in a nonhomogeneous semiconductor, such as silicon, or at a junction between two types of material, by the absorption of light or other electromagnetic radiation.

PHOTOVOLTAIC

Capable of generating a voltage as a result of exposure to visible or other radiation.

PHOTOELECTRIC CONSTANT

The ratio of the frequency of radiation causing emission of photoelectrons to the voltage corresponding to the energy absorbed by a photoelectron; equal to Planck's constant divided by the electron charge.

PH METER

An electronic voltmeter using a pH-responsive electrode that gives a direct conversion of voltage differences to differences of pH at the temperature of the measurement.

PHASE UNDERVOLTAGE RELAY

Relay which functions by reason of the reduction of one 399 phonemic synthesizer phase voltage in a polyphase circuit. phasing See framing.

PHASE SPLITTER

A circuit that takes a single input alternating voltage and produces two or more output alternating voltages that differ in phase from one another.

PHASE-SHIFT CIRCUIT

A network that provides a voltage component which is shifted in phase with respect to a reference voltage.

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