The basic process of discharge discharge of gas discharge lamp is divided into three stages: 1 after the discharge lamp is connected to the working circuit, a stable self-sustaining discharge is generated, and the electrons emitted by the cathode are accelerated by the external electric field, and the electric energy is converted into the kinetic energy of the free electron; 2 the fast moving electron Collision with gas atoms, the gas atoms are excited, and the kinetic energy of the free electrons is converted into the internal energy of the gas atoms. 3 The excited gas atoms return to the ground state from the excited state, and the internal energy obtained is released as optical radiation. The above process is repeated and the lamp continues to emit light. The light radiation of the discharge lamp is related to the magnitude of the current density, the type of gas, and the level of the gas pressure. Certain types of gas atoms can only radiate spectral lines of certain wavelengths. At low air pressure, the radiation spectrum of the discharge lamp is mainly the characteristic line of the atom. When the air pressure rises, the radiation spectrum of the discharge lamp broadens and develops toward the long wave. When the air pressure is high, put it
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