抄録
This apparatus has been deviced for continuous recording of gas content ratio using interferometric gas analyzer. Interference fringes are focused through two reflecting prisms and a cylindrical lens on to photographic paper moving with a constant speed.
Due to the change of gas composition, the fringes move, and are recorded on the photo-graphic paper, which, after exposed, passes through developing, fixing and washing baths. From the fringe shift on the paper, volume percentage of the gas is measured.
Even the slightest change of pressure in gas chamber results in large error. To avoid the pressure change during gas sampling, a device is used so that the gas is introduced into the gas chamber intermittently and is recorded only when pressure is balanced. With this instrument, a variation of 5×10-7, in refractive index or 0.1% CO2, in air can be detected.
This instrument can be used in coal mines and various chemical factories for the pre-vention of danger and in theaters and public halls for sanitary purposes.
