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A mirror galvanometer is an ammeter that indicates it has sensed an electric current by deflecting a light beam with a mirror. The beam of light projected on a scale acts as a long massless pointer. In 1826, Johann Christian Poggendorff developed the mirror galvanometer for detecting electric currents. The apparatus is also known as a spot galvanometer after the spot of light produced in some models.

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  • Galvanòmetre de mirall (ca)
  • Mirror galvanometer (en)
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  • Un galvanòmetre mirall és un instrument electromecànic que indica que ha detectat un corrent elèctric desviant un feix de llum amb un mirall. El feix de llum projectat en una escala actua com un llarg punter sense massa. En 1826, Johann Christian Poggendorff va desenvolupar el galvanòmetre de mirall per detectar corrents elèctrics. L'aparell també es coneix com a spot galvanometer pel punt de llum produït en alguns models. (ca)
  • A mirror galvanometer is an ammeter that indicates it has sensed an electric current by deflecting a light beam with a mirror. The beam of light projected on a scale acts as a long massless pointer. In 1826, Johann Christian Poggendorff developed the mirror galvanometer for detecting electric currents. The apparatus is also known as a spot galvanometer after the spot of light produced in some models. (en)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/Galvanometro_a_bobina_mobile_di_Deprez_D'Arsonval_-_Museo_scienza_tecnologia_Milano_10979_01.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/H.W.Sullivan_Galavanometer_London.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Laser_galvo.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Spot_Galvanometer_picture.png
  • http://commons.wikimedia.org/wiki/Special:FilePath/Thomson_mirror_galvanometer.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/DynAXIS_L.jpg
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  • Un galvanòmetre mirall és un instrument electromecànic que indica que ha detectat un corrent elèctric desviant un feix de llum amb un mirall. El feix de llum projectat en una escala actua com un llarg punter sense massa. En 1826, Johann Christian Poggendorff va desenvolupar el galvanòmetre de mirall per detectar corrents elèctrics. L'aparell també es coneix com a spot galvanometer pel punt de llum produït en alguns models. Els galvanòmetres de mirall es van utilitzar àmpliament en instruments científics abans que hi haguessin amplificadors electrònics fiables i estables. Els usos més habituals eren els equips d'enregistrament per al sismòmetre i el cable de comunicacions submarí amb cables submarins utilitzats per a la telegrafia. En els temps moderns, el terme "galvanòmetre de mirall" també s'utilitza per a dispositius que mouen els feixos de [làser] fent girar un mirall a través d'un muntatge de galvanòmetres. El nom és sovint abreujat com galvo . (ca)
  • A mirror galvanometer is an ammeter that indicates it has sensed an electric current by deflecting a light beam with a mirror. The beam of light projected on a scale acts as a long massless pointer. In 1826, Johann Christian Poggendorff developed the mirror galvanometer for detecting electric currents. The apparatus is also known as a spot galvanometer after the spot of light produced in some models. Mirror galvanometers were used extensively in scientific instruments before reliable, stable electronic amplifiers were available. The most common uses were as recording equipment for seismometers and submarine cables used for telegraphy. In modern times, the term mirror galvanometer is also used for devices that move laser beams by rotating a mirror through a galvanometer set-up, often with a servo-like control loop. The name is often abbreviated as galvo. (en)
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