128 results about "Reference cavity" patented technology

The invention provides a method for measuring the temperature gradient between an optical pressure standard FP resonant cavity and a temperature control copper cavity. Comprises: determining sample data; fitting the sample data to obtain a first frequency change coefficient of the frequency change quantity of the measurement cavity along with the temperature change and a second frequency change coefficient of the frequency change quantity of the reference cavity along with the temperature change; determining a plurality of first thermal expansion coefficients of the measurement cavity, and determining a plurality of second thermal expansion coefficients of the reference cavity; determining a plurality of first temperature-induced frequency change rates of the measurement cavity, and determining a plurality of second temperature-induced frequency change rates of the reference cavity; a first temperature gradient between the measuring cavity and the copper cavity is determined, and a second temperature gradient between the reference cavity and the copper cavity is determined. According to the scheme, fitting processing and calculation are performed on the sample data to obtain the temperature gradient of the FP resonant cavity and the copper cavity, so that the actual temperature of the gas in the FP resonant cavity is corrected according to the temperature gradient, and the accuracy of substituting the gas temperature into the incidence relation to measure the pressure is improved.