ELECTRICAL MEASUREMENT CIRCUIT, GAS DETECTOR AND METHOD FOR MEASURING A GAS CONCENTRATION

An electric measurement circuit possesses an electrical reaction leg (2) for forming an oscillator (10) from a resonator (1), and furthermore possesses a measurement leg (4) the input of which is supplied by said electrical reaction leg (2). The measurement leg contains an adjustable phase shifter (...

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Bibliographische Detailangaben
Hauptverfasser:	AOUST GUILLAUME, GUERARD JEAN, LEVY RAPHAEL, VERLHAC BEATRICE, GAUDINEAU VINCENT, LE TRAON OLIVIER
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	BASIC ELECTRONIC CIRCUITRY ELECTRICITY FOR PERFORMING MECHANICAL WORK IN GENERAL GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL GENERATION OF NOISE BY SUCH CIRCUITS GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING,BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN ANON-SWITCHING MANNER IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC ORINFRASONIC WAVES MEASURING METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICALVIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY PERFORMING OPERATIONS PHYSICS RESONATORS TESTING TRANSPORTING
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Beschreibung
Zusammenfassung:	An electric measurement circuit possesses an electrical reaction leg (2) for forming an oscillator (10) from a resonator (1), and furthermore possesses a measurement leg (4) the input of which is supplied by said electrical reaction leg (2). The measurement leg contains an adjustable phase shifter (41) so that an additional excitation force (Fpa) that is applied to the resonator in the measurementleg can be adjusted in phase quadrature with respect to an excitation force (Fx) that is applied to said resonator in the electrical reaction leg. Such an electrical measurement circuit is particularly suitable for forming a photoacoustic gas detector. Figure 1 电气测量线路具有反馈电气支路(2)以与谐振器(1)形成振荡器(10)，并且还具有测量支路(4)，由所述反馈电气支路(2)提供的输入供应至测量支路(4)。测量支路包括可调移相器(41)，使得从测量支路施加至谐振器的附加激励力(F)可被调整成相对于从反馈电气支路施加至所述谐振器的激励力(F)处于相位正交。这样的电气测量线路尤其适于形成光声效应气体检测器。