Magnetometer | मैग्नेटोमीटर
Why in News?
Researchers at the Raman Research Institute, an autonomous institute of the Department of Science and Technology, developed a Raman-Driven Spin Noise Spectroscopy technique for an all-optical quantum magnetometer.
What is a Magnetometer?
A magnetometer is an instrument used to measure magnetic fields. Depending on its design, it may measure the magnitude, direction or variation of a magnetic field.
Earth's Magnetic Field
Magnetometers are extensively used to measure variations in Earth's magnetic field. Such measurements are important in geophysical surveys, mineral exploration, navigation and space science.
Quantum Magnetometry
Quantum magnetometers use quantum properties of atoms or other microscopic systems to detect extremely weak magnetic fields with high sensitivity.
Optically Pumped Atomic Magnetometers
One important class is the Optically Pumped Atomic Magnetometer. In these devices, light interacts with alkali-metal atoms whose spin states respond to an external magnetic field. Changes in the optical signal can then be used to infer the magnetic field.
SERF Magnetometers
Spin-Exchange Relaxation-Free magnetometers are highly sensitive atomic magnetometers that work under very weak magnetic-field conditions. They can achieve remarkable sensitivity but typically require careful magnetic shielding and specialised operating conditions.
Raman-Driven Spin Noise Spectroscopy
The RRI research explored a new method in which Raman-driven processes and spin-noise spectroscopy are used to measure magnetic fields optically. Such techniques may contribute to compact and sensitive quantum sensors.
Applications of Magnetometers
- Fundamental Physics: Measurement of extremely weak magnetic signals and testing physical phenomena.
- Medical Imaging: Sensitive magnetometers can detect very weak biomagnetic signals from the brain or heart.
- Navigation: Electronic compasses use measurements of Earth's magnetic field to determine orientation.
- Geology: Magnetic surveys help study rocks, mineral deposits and geological structures.
- Space Science: Spacecraft magnetometers study planetary and interplanetary magnetic fields.
- Defence: Magnetic-anomaly detection can have applications in detecting large metallic objects.
About Raman Research Institute
Raman Research Institute is an autonomous research institution located in Bengaluru. It was founded by Nobel laureate Sir C. V. Raman and is supported by the Department of Science and Technology, Government of India.
Important Dates
- 1948: Raman Research Institute was founded by Sir C. V. Raman.
- 1970: After the death of C. V. Raman, RRI was reorganised as an autonomous research institution.
- 8 July 2025: PIB highlighted the new RRI magnetometry research in the context of this current-affairs topic.
मैग्नेटोमीटर | हिंदी में विस्तृत विवरण
मैग्नेटोमीटर क्या है?
Magnetometer वह वैज्ञानिक उपकरण है जिसका उपयोग magnetic field की strength, direction अथवा variation को मापने के लिए किया जाता है।
Quantum Magnetometer
Quantum magnetometers atoms और अन्य microscopic systems के quantum properties का उपयोग करके बहुत weak magnetic fields को detect कर सकते हैं।
Optically Pumped Atomic Magnetometer
इस प्रकार के magnetometer में light और alkali atoms के interaction का उपयोग किया जाता है। External magnetic field के कारण atomic spin में होने वाले changes को optical signals के माध्यम से measure किया जाता है।
SERF
SERF का अर्थ Spin-Exchange Relaxation-Free है। यह अत्यंत sensitive atomic magnetometer technology है, लेकिन इसे बहुत weak magnetic-field environment और sophisticated magnetic shielding की आवश्यकता हो सकती है।
मुख्य उपयोग
- Fundamental physics
- Medical imaging और biomagnetic measurements
- Navigation
- Geological surveys
- Space research
- Defence applications
परीक्षा तथ्य
यदि प्रश्न में fundamental physics, medical imaging और navigation तीनों को magnetometer के applications के रूप में दिया जाए, तो तीनों सही हैं।