Chirp signal analysis with amplitude modulation

Gavriloaia, Gheorghe; Neamtu, Catalin; Gavriloaia, Mariuca-Roxana

doi:10.1117/12.970378

Cited by 2 publications

(1 citation statement)

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“…An FMCW signal is a frequency modulated signal whose frequency can be rapidly changed during measurement. Linear chirp is one of most common FMCW signals [16][17] in which the carrier frequency is modulated by a periodical "saw tooth" wave and the frequency can sweep through a range of values continuously and rapidly during each period of the "saw tooth" wave. Since the interrogation frequency is swept continuously and the sensing signal backscattered by the antenna sensor is frequency dependent 4, 6 , the amplitude of antenna backscattering therefore also varies continuously with time.…”

Section: Introductionmentioning

confidence: 99%

Dynamic interrogation of wireless antenna sensor

et al. 2014

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This paper presents the dynamic interrogation of a wireless antenna sensor for mechanical vibration monitoring. In order to interrogate the antenna resonant frequency at sufficient high speeds, a wireless interrogator that consists of a Frequency Modulated Continuous Wave (FMCW) synthesizer, a signal demodulation unit, and a real-time digital signal processing program was developed. The principle of operation of the dynamic wireless sensing system is first described, followed by the description of the design and implementation of the antenna sensor and the wireless interrogator. After calibrate the antenna sensor response using static tensile tests, dynamic interrogation of the wireless antenna sensor was carried out by subjecting the test specimen to a sinusoidal tensile load. The resonant frequency shifts of the antenna sensor were compared with the strains calculated from the applied loads. A good agreement between the antenna sensor readings and the strain values were achieved. A sampling rate of up to 50 Hz was demonstrated.

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Section: Introductionmentioning

confidence: 99%