A Measuring Method of Minute Elongation Based on f-p Etalon

Abstract

The invention discloses an F-P etalon-based measurement method for miniature extension quantity. The F-P etalon-based measurement method is characterized by comprising the following steps of enablingone end of a measured metal rod to be fixed and the other end to be connected with a lifting table of a workbench during measurement of a linear expansion coefficient of a metal rod, wherein the lifting table can be driven to synchronous ascend with slight extension of the length of the metal rod during the heating process; and enabling one end of a measured metal wire to be fixed and the other end to be connected with the lifting table during measurement of Young modulus of the metal wire by a stretching method. According to the method, the miniature extension quantity is converted to changeof radiuses of interference fringes in an F-P etalon interference optical field by an optical lever, and the measurement of the miniature extension quantity is further achieved by measuring distance among the interference fringes. The invention relates to the field of measurement equipment, in particular to the F-P etalon-based measurement method for the miniature extension quantity. The measurement process is simpler and more convenient, and the measurement result accuracy is higher.

Description

Technical field[0001]The present invention relates to the field of measuring equipment, and in particular to a method for measuring the small elongation based on F-P etalon.Background technique[0002]The material will expand and contract when the temperature changes. The linear expansion coefficient is usually used to describe how fast the length of the material changes with the temperature during the temperature change. The linear expansion coefficient can be measured by measuring the unit length of the material every 1℃ Elongation to characterize. In addition, within the elastic limit of the material, the material will also undergo elastic deformation such as stretching, compression, bending, twisting or shearing under the action of external force. The Young's modulus is used to characterize the degree of difficulty of the material's longitudinal elastic deformation. Young's modulus is numerically equal to the stress at which unit strain is generated. It can be seen that both the m...

AI Technical Summary

Problems solved by technology

However, in the existing multi-beam isoclinic interference measurement, the radius of the annular interference fringes in the central area of ​​the interference light field is usually measured, but due to the distribution characteristics of the isoclinic interference fringes and the limitation of the field of view , resulting in a relatively small number of fringes whose radius can be measured in the central region of the interference light field

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