Millimeter Wave Radar-based Plasma Measurements

Schulz, Christian; Baer, Christoph; Fiebrandt, Marc

doi:10.1109/apmc46564.2019.9038885

Cited by 4 publications

(1 citation statement)

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“…To demonstrate the sensitivity of the radar based measurements approach a simplified scenario was created using a threedimensional full-wave simulator (CST Microwave Studio). An overmoded waveguide design was chosen to keep the simulation scenario as simple as possible [19]. Choosing an overmoded waveguide enables propagation under almost freespace conditions without using excessive computing resources.…”

Section: A Refractionmentioning

confidence: 99%

Radar-Enabled Millimeter-Wave Sensing of Fire Interactions

Schenkel,

Schultze,

Baer

et al. 2024

IEEE Trans. Instrum. Meas.

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This paper investigates the impact of fire on electromagnetic waves within a 70-90 GHz frequency range. To gain a deeper understanding of interactions between fire and radar signals, it is essential to consider a dielectric model for flames. Three primary mechanisms have been identified: the relative permittivity of reaction products, absorption of ionized gases, and the influence of incomplete combustion. To explore these mechanisms, two distinct test fires were examined in a fire laboratory in a style of the European standard EN54. Initial experimental series involved the combustion of liquid n-heptane, followed by a series of experiments focusing on open polyurethane combustion. Measurements were conducted using a frequency modulated continuous wave radar sensor. Additionally a PT1000 resistor, and an optical extraction measuring instrument were used as reference. Based on highly precise phase evaluation of the measurement signal, initial correlations were established between the radar-measured phase and the measured particle density. The proven ability to differentiate between two test fires suggests the potential for fire detection using FMCW radar sensors.

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Section: A Refractionmentioning

confidence: 99%