A NEW METHOD FOR MEASURING PHASE-SHIFT IN HETERODYNE INTERFEROMETRIC MEASUREMENT

被引：5

作者：

BI, DG ^{[1
]}

KUBO, S ^{[1
]}

NISHIZAWA, A ^{[1
]}

TAKAHASHI, C ^{[1
]}

FUJITA, J ^{[1
]}

机构：

[1] NATL INST FUS SCI,CHIKUSA KU,NAGOYA 46401,JAPAN

来源：

REVIEW OF SCIENTIFIC INSTRUMENTS | 1990年 / 61卷 / 05期

关键词：

D O I：

10.1063/1.1141149

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

A new method for analyzing the phase shift of probe beat in heterodyne interferometric measurement has been developed. The phase shift is obtained directly from the changes of the probe beat period without comparing with a reference beat. An electric circuit system has been designed according to this method of measurement, combined with a heterodyne interferometer of HCN laser or 4 mm microwave of line-integrated electron density of plasma in the compact helical system (CHS). The experimental results show that the method is effective. It simplifies the interferometric system and is free from the trouble of initial phase difference between the probe beat and reference. The minimum measurable phase shift is determined by the ratio of beat frequency to the counting clock frequency. The maximum measurable phase shift is infinite in principle.

引用

页码：1442 / 1447

页数：6

共 6 条

[1] A HETERODYNE PLASMA INTERFEROMETER BASED ON POLARIZATION MODULATION OF A HCN LASER [J].