Device for measuring refractive index of gas based on light path folding and vacuumizing mode

Abstract

The invention relates to a device for measuring the refractive index of gas based on a light path folding and vacuumizing mode. The device comprises a self-built light path folding type Michelson interferometer, a special gas chamber, a vacuum pumping module and a data acquisition system; the light path folding type Michelson interferometer comprises a light source, a square beam splitter prism, five plane reflectors and a beam expander; the special gas chamber is an aluminum circular tube with quartz glass observation windows at the two ends; the vacuum pumping module comprises a vacuum hose, a vacuum buffer chamber, a sucking pump and a digital temperature barometer; the data acquisition system comprises an optical screen, a light intensity detector and a computer. According to the invention, five plane reflectors are used to realize light path folding, so that the effect to be measured is greatly enhanced and the space required by the instrument device is compressed; the refractive indexes of various gases can be measured by adopting a measurement mode of firstly vacuumizing and then filling the gases, and the change of the air pressure in the gas chamber can be uniform and slow by arranging the vacuum buffer chamber, so that the accuracy of measuring the refractive indexes of the gases is improved.

Description

technical field [0001] The application relates to the field of precision measurement technology of gas refractive index and teaching instruments and equipment, in particular to a device for measuring gas refractive index based on optical path folding and vacuuming. Background technique [0002] Michelson interferometer is widely used in the field of precision measurement. Measuring the refractive index of gas is one of the important applications of Michelson interferometer, and it is also an important experimental project in the physics experiment course of colleges and universities. Inflating and pressurizing the method, because the special gas chamber is small, the pressure change process is not stable enough, the gas temperature changes greatly, and the optical path is too short, resulting in a small number of interference fringes, and the measurement effect is not large, so large errors will occur; This method can only measure the refractive index of air, and the traditi...

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Problems solved by technology

[0002] Michelson interferometer is widely used in the field of precision measurement. Measuring the refractive index of gas is one of the important applications of Michelson interferometer, and it is also an important experimental project in the physics experiment course of colleges and universities. Inflating and pressurizing the method, because the special gas chamber is small, the pressure change process is not stable enough, the gas temperature changes greatly, and the optical path is too short, resulting in a small number of interference fringes, and the measurement effect is not large, so large errors will occur; This method can only measure the refractive index of air, and the refractive index of gases with other properties cannot be measured by traditional Michelson interferometry

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