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Recently, the importance of EMI/EMC investigations is increasing in the field of traffic systems and automobiles. The method of electromagnetic measurement using integrated optics devices is appropriate for EMI evaluations. The method has several advantages: small size, fast frequency response and minimum perturbation for the field to be measured. Electromagnetic sensing technologies using integrated...
The heterodyning process using laser Doppler velocimetry (LDV) has an ambiguity of 180° in the direction of the velocity. Therefore, a frequency shifting method has been used to obtain an appropriate shift in a measurement system. This paper describes a new frequency shifting method used in LDV, which employs a laser diode (LD) modulated by injection current and an unbalanced optical fibre interferometer...
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