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Mass Analyzers: Common Types01:19

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The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
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Long-Range and Dead-Zone-Free Dual-Comb Ranging for the Interferometric Tracking of Moving Targets.

Sandro L Camenzind1, Lukas Lang1, Benjamin Willenberg1

  • 1Department of Physics, Institute for Quantum Electronics, ETH Zurich, 8093 Zurich, Switzerland.

ACS Photonics
|April 21, 2025
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Summary
This summary is machine-generated.

Dual-comb ranging offers dead-zone-free, high-precision distance measurements up to 40m. This method uses a GPU-accelerated algorithm and a specialized laser for real-time tracking with nanometer-level accuracy.

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Area of Science:

  • Optical metrology
  • Laser physics
  • Precision measurement

Background:

  • Dual-comb ranging is a key technology for precise, long-distance measurements.
  • Existing methods face limitations in speed, accuracy, and dead zones.

Purpose of the Study:

  • To demonstrate a dead-zone-free dual-comb ranging method for long-distance metrology.
  • To achieve real-time tracking of moving targets with high precision.

Main Methods:

  • Utilized a free-space transceiver unit with a free-running dual-comb laser (λc ≈ 1055 nm, 1 GHz PRR).
  • Implemented a graphics processing unit (GPU)-accelerated algorithm for real-time signal processing.
  • Employed interchangeable comb roles for simultaneous, long-distance measurements.

Main Results:

  • Achieved single-shot time-of-flight precision of ~0.1 μm at >40 m.
  • Improved single-shot precision to <20 nm using phase information for interferometric measurements.
  • Demonstrated ranging accuracy with residuals <3 μm over a 40 m target motion compared to a reference interferometer.

Conclusions:

  • The developed dual-comb ranging approach enables accurate, dead-zone-free long-distance measurements.
  • The system supports real-time tracking of moving targets with nanometer-level precision.
  • This technology holds significant potential for advanced metrology applications.