Abstract
This paper presents a method of measuring gas flow velocity based on the thermal time-of-flight method. The essence of the solution is an analysis of the time shift and the shape of voltage signals at the transmitter and at a temperature wave detector. The measurements used a probe composed of a wave transmitter and a detector, both in the form of thin tungsten wires. A rectangular signal was used at the wave transmitter. The time-of-flight of the wave was determined on the basis of the time shift of two selected characteristic points of the voltage waveform at the transmitter and the wave detector. To obtain the correct velocity indication, a correction in the form of a simple power function was applied. From the measurements performed, the relative uncertainty of the method was obtained, from approx. 4% of the measured value at an inflow velocity of 6.5 cm/s to 1% for an inflow velocity of 50 cm/s and higher.
Highlights
Measurements of the gas flow velocity constitute an important branch of metrology
This paper describes an attempt to modify the thermal wave method so that it is enough to use only one wave detector to determine the gas flow velocity
T2, standing behind two terval between the characteristic points of the voltage waveform on the wave transmitter and the inflow velocity v∞ = 1.97 m/s
Summary
Measurements of the gas flow velocity constitute an important branch of metrology. They are widely used in industrial and laboratory measurements. The need to measure gas flow velocity appears in the chemical, aviation, and automotive industries, in the control of ventilation systems. Another issue is the study of air flows in closed spaces (such as production halls, offices, storage rooms, etc.). There is a great variety in the methods of measuring the gas flow velocity
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