公开(公告)号：US20230135076A1

公开(公告)日：2023-05-04

申请号：US18089210

申请日：2022-12-27

Applicant: Zhejiang Lab ,  Zhejiang University

Inventor： Huizhu Hu ,  Zhenhai Fu ,  Xiaowen Gao ,  Tao Liang ,  Peitong He ,  Jing Jiang

IPC: G01R29/12

Abstract: A method for electric field measurement based on a levitated particle includes steps of (1) capturing a particle and levitating the captured particle; (2) adjusting a quantity of electric charge carried by the levitated particle; (3) measuring a charge number N of the levitated particle; (4) disposing the levitated particle in an electric field to be measured, measuring a displacement power spectral density Svxel of the levitated particle under the electric field and obtaining an electric field force Fel; and (5) according to a formula of E=Fel/Nqe, obtaining an electric field intensity E. An apparatus for electric field measurement based on a levitated particle includes a high-voltage DC (direct current) power supply, two bare wire electrodes, a vacuum chamber, a trapping laser, an objective lens, a pair of parallel electrodes, a collective lens, a quadrant photodetector, a lock-in amplifier, a signal generator and a power amplifier.

公开(公告)号：US11789057B2

公开(公告)日：2023-10-17

申请号：US18089210

申请日：2022-12-27

Applicant: Zhejiang Lab ,  Zhejiang University

Inventor： Huizhu Hu ,  Zhenhai Fu ,  Xiaowen Gao ,  Tao Liang ,  Peitong He ,  Jing Jiang

IPC: G01R29/12

CPC classification number: G01R29/12

Abstract: A method for electric field measurement based on a levitated particle includes steps of (1) capturing a particle and levitating the captured particle; (2) adjusting a quantity of electric charge carried by the levitated particle; (3) measuring a charge number N of the levitated particle; (4) disposing the levitated particle in an electric field to be measured, measuring a displacement power spectral density Svxel of the levitated particle under the electric field and obtaining an electric field force Fel; and (5) according to a formula of E=Fel/Nqe, obtaining an electric field intensity E. An apparatus for electric field measurement based on a levitated particle includes a high-voltage DC (direct current) power supply, two bare wire electrodes, a vacuum chamber, a trapping laser, an objective lens, a pair of parallel electrodes, a collective lens, a quadrant photodetector, a lock-in amplifier, a signal generator and a power amplifier.