MEASUREMENT OF PHOTON PRESSURE

Jeah-Sheng Wu, Hsien-Chi Yeh, Sheau-shi Pan

Abstract

Center for Measurement Standards has established a system to probe micro force down to nano Newton. Based on a very stable torsion strip pendulum with restoring torque constant 5.25·10^-6 N·m/rad. Light beam of a high power Nd:YAG laser was reflected by the mirror attached on pendulum frame. Result in angular deflection of the pendulum. The deflection was measured by an angular interferometer with resolution 1.95·10^-7 rad. Modulation signal, generated by varying power of laser, shift the pendulum from its standing position. The angular deflection equivalent torque is the same as photon generating torque to within 22%.

Keywords

photon pressure, torsion pendulum

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PWC-2006-TC3-044u.pdf

DOI

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IMEKO TC

TC3 - Measurement of Force, Mass, Torque, and Gravity

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