Reference for citation: Zenevich A. O., Kochergina O. V. Noise diode as a basis for creating thermo-anemometers. Journal of Instrument Engineering. 2025. Vol. 68, N 12. P. 1094–1100 (in Russian). DOI: 10.17586/0021-3454-2025-68-12-1094-1100.

Abstract. The possibility of using noise diodes in the implementation of the thermo-anemometer method is evaluated. Noise diodes of the ND102L and ND103L models produced in Belarus are selected as objects of research. An increase in the supply voltage of the noise diode leads to an increase in the repetition rate of the noise pulses to a certain value. In the overvoltage range from -0.20 to 0.40 V for ND102L and from -0.09 to 0.70 V for ND103L, there is an increase in the frequency of noise pulses, which at a temperature of 293 K takes the highest value: 455 kHz for ND102L and 1014 kHz for ND103L. Thus, changing the overvoltage applied to the noise diode in these intervals allows to adjust the frequency of occurrence of noise pulses. It is shown that with a constant value of the supply voltage of the noise diode and an increase in temperature, the frequency of occurrence of noise pulses generated on the load decreases. The temperature dependence of the frequency of noise pulses is more pronounced for ND103L than for ND102L. A thermo-anemometer method for determining the velocity of air flow propagation based on noise diodes is proposed. The method allows to register the minimum value of the air flow velocity of 0.2 m/s for both studied models of noise diodes. The time to set the temperature is 30 seconds after the start of exposure to the air flow.

Keywords: noise diode, hot-wire anemometer, noise pulse frequency, temperature, air flow velocity

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