The effects of atmospheric pressure on the calibration factor of SSNTD for radon w.

The vertical profiles of atmospheric pressure and optical refractive index have been theoretically analyzed and formulas that express the vertical atmospheric pressure and refractive index distribution have been derived,and their simplified forms have been given.

Study and analyze the influence of such factors as temperature,moisture and atmospheric density upon the atmospheric pressure by means of the physical model——vertical atmospheric column,in the quasi-static process of heat insulation,on the basis of the viewpoint of the balance of static force.

Evaluation the factors effected on the dualchanel laser interferometer precise measurement in micromanufacture, emphasizing on the measured value changed with the atmosphere pressure, temperature, humidity, which would greatly work on the results of the micromanufature.

In this paper,the reason of the error which is produced by the formula of atmospheric intensity of pressure is analyzed and that the calculation error brought by the different molecule mass in atmosphere is the main reason of the error is pointed out.

The atmospheric specific heat ratio in the atmospheric pressure formula,which is derived from the polymorphic equation,is calculated exactly by using simulated annealing algorithm.