Ultra Low Frequency Noise Generator
スポンサーリンク
概要
- 論文の詳細を見る
Gaussian random noise, having a uniform power spectrum at very low frequencies, is very useful for simulation studies of random processes which occur in many branches of science.Noise generation by noisy resistors, diodes, phototubes and thyratrons requires elaborate regulation, and also has disadvantages of nonuniform power spectra at low frequencies and of hum-pickup.In our experiment to remove such disadvantages, some transformations to the original noise were applied. This transforming technique is the one that simulates the process generating shot effect noise in a diode, by a radioactive source and a low-pass filter. A monostable multivibrator triggered by output pulses of a radiation detector actuated by the radioactive source yields a random phase impulse train with Poissonian appearances. When this impulse train is fed to the low pass filter whose cut-off frequency is low enough in comparison with the rate of occurrence of impulse, a continuous random wave is obtained at the output terminal of the low pass filter.This process is similar to that of generating shot effect noise in a vacuum tube. As the rate of occurrence of impulse increases, the probability distribution of the output wave approaches normal (Gaussian).In our experiment, a radium luminous paint and a self quenched Geiger-Müller tube were used as noise source and radiation detector, respectively. This generator has a transistorized true RMS meter to indicate the RMS value of the output wave and an elapsed time meter for maintaining G-M tube.A χ2 (chi-squared) test for a histogram of the output wave verifies that the hypothesis that the experimental distribution is Gaussian can not be denied.This method is valuable for practical use in obtaining DC∼50c/s Gaussian noise because of its simplicity, thereby making the maintenance of the noise-generator quite easy.
- 公益社団法人 計測自動制御学会の論文
公益社団法人 計測自動制御学会 | 論文
- Self-Excited Oscillation of Relay-Type Sampled-Data Feedback Control System
- タイトル無し
- Mold Level Control for a Continuous Casting Machine Using an Electrode-Type Mold-Level Detector
- Assessment and Control of Noise:Pollution by Noise from General Sources
- Information network system and home automation.