High-precision pressure optical measurement method in variable-temperature environment

The invention relates to a high-precision pressure optical measurement method in a variable-temperature environment, and belongs to the technical field of metering test. Two optical gas pressure measurement method models of a refractive index method and a direct absorption method in an absorption spectroscopy are combined, unknown temperature variables are eliminated by connecting two model equations, and an accurate pressure value of measured gas is solved in real time. According to the invention, the influence of temperature change on the pressure measurement result can be eliminated in realtime in a variable temperature environment, and the pressure measurement precision is improved. 本发明涉及一种变温环境下高精度压力光学测量方法，属于计量测试技术领域。本发明通过结合折射率法和吸收光谱法中的直接吸收法两种光学气体压力测量方法模型，通过联系两个模型方程，消除未知的温度变量，实时求解被测气体的精确压力值。此发明能够在变温环境下实时消除温度变化对压力测量结果的影响，提高了压力的测量精度。