(Shanghai Electric Power Light Source Research Institute, Fudan University, Shanghai 200433)
Abstract: This paper conducts a series of experimental studies on the fringe instability in a 50Hz low frequency fluorescent lamp. The results show that under experimental conditions, the streak instability in the fluorescent lamp is independent of the disturbance in the cathode region. The nature of the stripe instability is only related to the cold junction temperature of the tube.
Keywords: fluorescent light, stroboscopic, striped discharge
The streak instability in low-pressure glow discharges was first discovered in the 1930s by Michael Faraday. Since then, relevant research work has been in the hottest ranks internationally. In 1968, Pekarek summed up the previous studies on the streak instability in rare gases and gave the dispersion relation curve of the stripe instability. With the deepening of research, electronic dynamics has played an increasingly important role in the study of fringe instability. Tsendin used an unlocalized field approximation and a "black wall hypothesis" to obtain an analytical solution of the Boltzmann equation of electrons, which is a periodic function of space. He proposed that the non-locality of high-energy electrons is responsible for the stray instability of the discharge. Golubovskii deepened the study of Kenting and further studied the causes of streak instability in rare gases through theoretical and experimental means.
In 2006, Kolobov summarized the trends and results of the study of streak instability since the 1970s. It is pointed out that the specific causes and physical processes of stray-dissipative discharges still need to be more comprehensive and detailed. the study. In the lighting industry, low-pressure glow discharge is one of the most important luminescence principles, and the related theoretical and experimental research is quite extensive. Stripe instability in fluorescent lamps has always been a concern because it can have a very negative impact on the environment being illuminated. Relevant research work at home and abroad shows that the streak instability in fluorescent lamps may come from the electrode area, and the nature of the stripe changes with the change of external temperature. In this paper, we will conduct some experimental studies on the streak instability in fluorescent lamps, and analyze the possible causes and influencing factors.
This paper is divided into three parts: 1. Experimental introduction; 2. Experimental process, results and discussion; 3. in conclusion.
1. Experimental introduction
The main circuit of the experiment is made up of a 36W T8 fluorescent tube, a matching magnetic ballast and a starter. The entire circuit is powered by an adjustable voltage transformer. The output range of this transformer is 20V ~ 250V 50Hz AC. The voltage and current of the lamp are measured by the corresponding probe. The light output of the lamp is received by a photodiode and then input to the oscilloscope. By filtering and transforming the optical signal and filtering the high-frequency components, we can obtain some parameters of the fringe instability, such as frequency and relative intensity. The emission spectrum of the lamp was measured by an Ocean Optics spectrometer. Experimental circuit and equipment are shown in Figure 1.
