The paper introduce the measurement of some beam parameters for Hefei Light Source (HLS) by frequency domain technique, which include the betatron tune, average beta function, natural chromaticity, corrected chroinati...The paper introduce the measurement of some beam parameters for Hefei Light Source (HLS) by frequency domain technique, which include the betatron tune, average beta function, natural chromaticity, corrected chroinaticity, and center frequency. Additionally, the measurement of the influence of DC clearing electrodes on the betatron tune shift is also described. Some measurement results are given. The measurement results are compared with the theoretical values and shown to be in good agreement.展开更多
Conventional frequency-sweep interferometry is unreliable for noncooperative or long-distance targets owing to scattering on the target surface.Hence,this paper proposes a laser frequency-swept carrier(LFSC)ranging me...Conventional frequency-sweep interferometry is unreliable for noncooperative or long-distance targets owing to scattering on the target surface.Hence,this paper proposes a laser frequency-swept carrier(LFSC)ranging method based on resonant cavity enhancement for long-distance noncooperative target measurements and weak-signal detection.Experimental verification revealed that for a target comprising an oxidized black aluminum plate at a distance of 16 m,the standard deviation of 10 measurements was less than 70μm,measurement accuracy exceeded 27μm,and system ranging resolution exceeded 0.13 mm when the target feedback light was very weak.This method is useful for measurements of noncooperative targets,eg.,large-scale component assembly,industrial measurement,and biomedical testing.展开更多
基金Supported by National Important Project on Science-Phase Ⅱ of National Synchrotron Radiation Laboratory
文摘The paper introduce the measurement of some beam parameters for Hefei Light Source (HLS) by frequency domain technique, which include the betatron tune, average beta function, natural chromaticity, corrected chroinaticity, and center frequency. Additionally, the measurement of the influence of DC clearing electrodes on the betatron tune shift is also described. Some measurement results are given. The measurement results are compared with the theoretical values and shown to be in good agreement.
基金National Natural Science Foundation of China(52475532, 51875447)
文摘Conventional frequency-sweep interferometry is unreliable for noncooperative or long-distance targets owing to scattering on the target surface.Hence,this paper proposes a laser frequency-swept carrier(LFSC)ranging method based on resonant cavity enhancement for long-distance noncooperative target measurements and weak-signal detection.Experimental verification revealed that for a target comprising an oxidized black aluminum plate at a distance of 16 m,the standard deviation of 10 measurements was less than 70μm,measurement accuracy exceeded 27μm,and system ranging resolution exceeded 0.13 mm when the target feedback light was very weak.This method is useful for measurements of noncooperative targets,eg.,large-scale component assembly,industrial measurement,and biomedical testing.
