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Related Concept Videos

Interference: Path Lengths01:10

Interference: Path Lengths

Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...
Interference and Diffraction02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
Atomic Absorption Spectroscopy: Interference01:25

Atomic Absorption Spectroscopy: Interference

Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
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Drug Concentration Versus Time Correlation

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Atomic Emission Spectroscopy: Interference01:30

Atomic Emission Spectroscopy: Interference

In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
Distance Problem01:29

Distance Problem

When an object's velocity changes over time, the total distance traveled can be determined by summing small displacement intervals over short increments. This approach approximates the true distance through numerical summation and the use of integral calculus. An estimate of the total displacement can be obtained by measuring velocity at regular intervals and multiplying each value by the corresponding time step.If a runner accelerates over the first three seconds of a race, speed measurements...

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Related Experiment Video

Updated: May 14, 2026

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
08:22

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Published on: August 6, 2018

Multi-Path Interference Challenges and Suggested Solution for Correlation-Assisted Direct Time-of-Flight.

Ayman Morsy1, David Blinder1,2, Maarten Kuijk1

  • 1Department of Electronics and Informatics, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium.

Sensors (Basel, Switzerland)
|May 13, 2026
PubMed
Summary
This summary is machine-generated.

Correlation-assisted direct time-of-flight pixels offer low-power depth sensing but suffer from multi-path interference. A new multi-frequency algorithm significantly improves depth accuracy and system reliability by mitigating these interference effects.

Keywords:
depth sensinglight detection and ranging (LiDAR)multi-path interferenceresolving algorithmsingle-photon avalanche diode (SPAD)time of flight (ToF)

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Last Updated: May 14, 2026

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Area of Science:

  • Optoelectronics
  • Computer Vision
  • Sensor Technology

Background:

  • Correlation-assisted direct time-of-flight (CA-dToF) pixels provide low-power, high-resolution depth sensing.
  • Existing time-of-flight systems struggle with multi-path interference (MPI), causing depth errors.

Purpose of the Study:

  • To systematically analyze the impact of MPI on CA-dToF pixel performance.
  • To propose and evaluate a novel algorithm for mitigating MPI in CA-dToF systems.

Main Methods:

  • Detailed analysis of MPI effects on CA-dToF pixel measurements.
  • Development and implementation of a multi-frequency modulation algorithm.

Main Results:

  • Quantified the detrimental effects of MPI on CA-dToF depth estimation.
  • Demonstrated significant improvements in depth accuracy using the proposed multi-frequency algorithm.

Conclusions:

  • MPI is a critical factor limiting CA-dToF reliability.
  • The multi-frequency modulation algorithm effectively reduces MPI, enhancing depth accuracy and overall system performance.