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Mahesh

14/03/23 10:11 AM IST

World’s fastest single-shot camera confirms how flames form soot

In News
  • Scientists from Germany and the U.S. have built the world’s fastest single-shot laser camera – 1,000x faster than its predecessors at capturing extremely short-lived events.
About Laser Camera
  • The device’s technique is called laser-sheet compressed ultrafast photography (LS-CUP) combining laser sheet imaging with compressed sensing on a standard streak camera system.
  • It “can resolve a plane of a three-dimensional object like a flame or spray or any turbid media and can “resolve physical or chemical processes” in space and time.
  • It can capture images at 12.5 billion frames per second (fps).
  • Their device can also be used to photograph shockwaves in nuclear reactors, combustion of fine sprays, and an enigmatic process called sonoluminescence (sometimes, when excited by sound, bubbles in a liquid implode and release light at a temperature of ~10,000 K), all of which involve processes that happen in a few nanoseconds.
  • The laser sheet and the camera are synchronized so that the camera captures the object at different times as it moves through the laser sheet. The resulting images can be combined to create a 3D movie of the object’s motion.
Benefits
  • LSCUP can capture ultrafast events with high temporal and spatial resolution, enabling researchers to study dynamic processes in detail.
  • LSCUP is a non-invasive imaging technique that does not require physical contact with the object being imaged. This is especially useful for studying delicate biological samples or explosive events.
  • LSCUP can capture multiple images of an object from different angles, allowing for the creation of a 3D movie of the object’s motion.
Disadvantages
  • LSCUP requires specialized equipment, such as ultrafast lasers and high-speed cameras, which can be expensive.
  • Although LSCUP is relatively easy to set up compared to other high-speed imaging techniques, it still requires careful calibration and synchronization of the laser sheet and camera.
  • LSCUP may not be suitable for all types of samples, particularly those that are opaque or have complex structures that can block or scatter the laser sheet.
  • LSCUP generates a large amount of data, and processing this data can be time-consuming and computationally intensive.
Soot
  • Soot is a form of particulate air pollutant, produced from incomplete combustion.
  • Soot, commonly known as Black carbon.
  • Black carbon is a solid particle or aerosol (though not a gas) that contributes to warming of the atmosphere.
  • India and China are the largest emitters of black carbon in the world.
  • The Indo-Gangetic plains will become the largest contributor of black carbon, with about 20 per cent from biofuels, 40 per cent from fossil fuels and about 40 per cent from biomass burning.
Source- The Hindu

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