We study experimentally the spectral characteristics of low-frequency current fluctuations in tungsten filaments of lighting lamps in the ranges of frequencies 2.5・10⁻⁴ – 5・10⁻¹ Hz and temperatures 1260 – 2600 K. To decrease the influence of the edge effects and increase the measurement accuracy, we use subtraction (compensation) of the constant component of the current. Application of special schemes allowed decreasing significantly the influence of the inherent noise of power supplies which are used to feed the lamp filaments. It is found that low-frequency current fluctuations are a randomly time-interleaved aggregate of four random processes: relaxation, pulsed, stepwise, and quasi-continuous ones. We show that relative fluctuations do not exceed 3 ・ 10⁻⁴ in the entire range of the studied frequencies, and the frequency dependence of the spectral power density is well approximated by a function having the form 1/f^γ and the index γ of the power spectral density within the (1.6 – 1.8) ± 0.2 limits. The dependence of the parameters of the power spectral density of low-frequency current fluctuations on the average value of the current and the volume-average temperature is studied. In our opinion, the revealed features of low-frequency fluctuations are related to the electron, atomic, and degradation processes in lamp filaments.

我们通过实验研究了照明灯的钨丝中低频电流波动的频谱特性，其频率范围为2.5 ・ 10 ⁻⁴ – 5 ・ 10 ^-1 Hz和温度1260 – 2600K。为减小边缘效应的影响为了提高测量精度，我们使用电流恒定分量的减法（补偿）。特殊方案的应用允许显着降低用于馈送灯丝的电源固有噪声的影响。发现低频电流波动是四个随机过程的随机时间交错集合：松弛过程，脉冲过程，步进过程和准连续过程。我们证明相对波动不超过3 ・ 10 ^-4在所研究的整个频率范围，和光谱功率密度的频率依赖性是公由具有形式的函数来近似的1 / f ^γ和功率谱密度的中的索引γ（1.6 - 1.8）±0.2范围。研究了低频电流波动的功率谱密度参数对电流平均值和体积平均温度的依赖性。我们认为，低频波动的显着特征与灯丝中的电子，原子和降解过程有关。