Office National D'etudes Et De Recherches Aerospatiales

Béatrice Verlhac

Raphaël Levy

Jean Guerard

Olivier Le Traon

Vincent Gaudineau

Pierre Lavenus

Guillaume Aoust

Disclosed is a system and method that provide an amplitude value and a phase delay value which relate to a sinusoidal signal to be measured. For this purpose, phase values of a reference signal, at which the signal to be measured exceeds or falls below the reference signal, are collected and transmitted to a computation unit. The computation unit determines the amplitude and delay values from the collected phase values. The system can be implemented in a cost-effective manner, in particular using an ASIC circuit or an FPGA circuit.

System and method for providing the amplitude and phase delay of a sinusoidal signal

An electric measurement circuit possesses an electrical reaction leg for forming an oscillator from a resonator, and furthermore possesses a measurement leg the input of which is supplied by the electrical reaction leg. The measurement leg contains an adjustable phase shifter so that an additional excitation force that is applied to the resonator in the measurement leg can be adjusted in phase quadrature with respect to an excitation force that is applied to the resonator in the electrical reaction leg. Such an electrical measurement circuit is particularly suitable for forming a photoacoustic gas detector.

Electrical measurement circuit, gas detector and method for measuring a gas concentration

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Issy les Moulineaux, France

Béatrice Verlhac