| 摘要 |
FIELD: measuring equipment.SUBSTANCE: invention relates to temperature surveys and can be used for measuring high-speed high-temperature processes in gas dynamics and designing systems for automatic temperature control. Quick-acting gas flow temperature measurement device consists of two measurement channels to form a differential circuit and data processing unit. Each measurement channel comprises a jet generator, piezoelectric transducer for conversion of acoustic signal into electric signal, electronically adjustable filter, phase comparator, key, sawtooth voltage generator, uni-vibrator, voltage-to-code converter. Data processing unit contains a code subtractor, one OR element, three AND circuits, first and second inverters, two code dividers. Device involves implementation of the principle of phase-lock loop of first frequency harmonic of polyharmonic signal using an electronically adjustable filter controlled by the sawtooth voltage generator, and digital processing of measurement date using the differential measurement method.EFFECT: higher efficiency and accuracy, as well as a simplified gas flow temperature measurement device that allows to maintain its serviceability in case of the failure of one of the measurement channels.1 cl, 1 tbl, 2 dwg |
