Device and method for measuring magnetoconstriction coefficient by using Doppler polarizer through sinusoidal modulation multi-beam laser heterodyne method

• Main Authors: WANG CHUNHUI, GAO LONG, CONG HAIFANG, SHAO WENMIAN, LI YANCHAO, QU YANG
• Format: Patent
• Language: Chinese; English
• Published: 15.02.2012
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The invention discloses a device and a method for measuring a magnetoconstriction coefficient by using a Doppler polarizer through a sinusoidal modulation multi-beam laser heterodyne method, which belong to the technical field of micrometric displacement detection. By using the device and the method provided by the invention, the problem that the measurement precision of a conventional method for measuring the magnetoconstriction coefficient cannot meet an ultra-precise measurement requirement is solved. The method provided by the invention comprises the following steps: enabling a plane reflecting mirror and a thickness-regardless thin glass plate to be mutually parallel and equal-height, enabling a distance d between the thickness-regardless thin glass plate and the reflecting surface of the plane reflecting mirror to be 20mm, and turning on a driving power supply of a polarizer, so that the polarizer begins carrying out simple harmonic vibration; and collecting an electric signal output by a photoelectric