Difference between revisions of "Dictionary:Proton-precession magnetometer/es"

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(Created page with "Magnetómetro de precesión nuclear")
 
(Created page with "El protón (núcleo de hidrógeno) tiene un momento magnético debido a su giro. Los núcleos precesan sobre el campo magnético ''H'' de la Tierra a una frecuencia ''f''<sub>...")
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{{#category_index:P|proton-precession magnetometer}}
 
{{#category_index:P|proton-precession magnetometer}}
The proton (hydrogen nucleus) has a magnetic moment because of its spin. The nuclei precess about the Earth&#x2019;s magnetic field ''H'' at a frequency ''f''<sub>''L''</sub> (<b>Larmor frequency</b>),  
+
El protón (núcleo de hidrógeno) tiene un momento magnético debido a su giro. Los núcleos precesan sobre el campo magnético ''H'' de la Tierra a una frecuencia ''f''<sub>''L''</sub> (<b>Frecuencia de Larmor </b>),  
  
 
<center><math>f_L=\frac{\gamma H}{2 \pi } </math>,</center>
 
<center><math>f_L=\frac{\gamma H}{2 \pi } </math>,</center>
  
 
where <math>\gamma</math> is the gyromagnetic ratio ( <math>\frac{2\pi}{23.4868}</math> Hz/nanotesla for protons). Precession of polarized nuclear spins induces a voltage at the precession frequency in a measuring coil. The induced frequency is measured by a counting arrangement (Figure [[Special:MyLanguage/Dictionary:Fig_P-16|P-16]]) to determine the value of the Earth&#x2019;s magnetic field. For the normal Earth field of about 50 000 nanotesla, ''f''<sub>''L''</sub>=2100 Hz. As the protons gradually relax into random orientation, the induced-field strength drops to zero. The rate of drop depends on interatomic forces and hence on molecular structure. Achievable accuracy: 0.1 nT. Also called <b>proton-resonance magnetometer</b>. Compare [[Special:MyLanguage/Dictionary:optically_pumped_magnetometer|''optically pumped magnetometer'']].
 
where <math>\gamma</math> is the gyromagnetic ratio ( <math>\frac{2\pi}{23.4868}</math> Hz/nanotesla for protons). Precession of polarized nuclear spins induces a voltage at the precession frequency in a measuring coil. The induced frequency is measured by a counting arrangement (Figure [[Special:MyLanguage/Dictionary:Fig_P-16|P-16]]) to determine the value of the Earth&#x2019;s magnetic field. For the normal Earth field of about 50 000 nanotesla, ''f''<sub>''L''</sub>=2100 Hz. As the protons gradually relax into random orientation, the induced-field strength drops to zero. The rate of drop depends on interatomic forces and hence on molecular structure. Achievable accuracy: 0.1 nT. Also called <b>proton-resonance magnetometer</b>. Compare [[Special:MyLanguage/Dictionary:optically_pumped_magnetometer|''optically pumped magnetometer'']].

Revision as of 21:33, 27 January 2018

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El protón (núcleo de hidrógeno) tiene un momento magnético debido a su giro. Los núcleos precesan sobre el campo magnético H de la Tierra a una frecuencia fL (Frecuencia de Larmor ),

,

where is the gyromagnetic ratio ( Hz/nanotesla for protons). Precession of polarized nuclear spins induces a voltage at the precession frequency in a measuring coil. The induced frequency is measured by a counting arrangement (Figure P-16) to determine the value of the Earth’s magnetic field. For the normal Earth field of about 50 000 nanotesla, fL=2100 Hz. As the protons gradually relax into random orientation, the induced-field strength drops to zero. The rate of drop depends on interatomic forces and hence on molecular structure. Achievable accuracy: 0.1 nT. Also called proton-resonance magnetometer. Compare optically pumped magnetometer.